ZOOM LENS, AND IMAGE PICKUP APPARATUS

BACKGROUND OF THE INVENTION
Field of the Invention

The present invention relates to a zoom lens, and an image pickup apparatus.

Description of the Related Art

In recent years, an image pickup apparatus such as a television camera, a silver halide film camera, a digital camera and a video camera has been desired to be provided with a zoom lens which has a wide angle of view, a high zoom ratio, and a high optical performance besides. As for the zoom lens having a large aperture ratio, the wide angle of view and the high zoom ratio, a positive-lead type of zoom lens is known which has a lens unit having a positive refractive power arranged closest to the object side, and makes a part of a first unit adjust the focus. In addition, as for a zooming method, a zoom lens is known which includes in order from an object side, a first lens unit that has a positive refractive power and is fixed during zooming, a second lens unit that has a negative refractive power and moves for zooming, and a lens unit for imaging, which is fixed during zooming in the side closest to the image plane.

Japanese Patent Application Laid-Open No. 2011-81063 proposes a high magnification zoom lens that has a zoom ratio of approximately 40 and an angle of view of approximately 27 degrees at a wide angle end.

In the above described positive lead type zoom lens, in order to achieve both high magnification and high optical performance at the telephoto side while keeping miniaturization and the widening of the angle of view, it becomes important to appropriately set the configuration, the refractive power and the focusing method of the first lens unit. Unless these configurations are appropriately set, it becomes difficult to obtain a zoom lens which has the wide angle of view, the high magnification and the high optical performance at the telephoto end.

In the zoom lens disclosed in Japanese Patent Application Laid-Open No. 2011-81063, an axial chromatic aberration during zooming and various aberrations in the periphery of the telephoto end have tended to increase along with an increase of magnification.

SUMMARY OF THE INVENTION

The present invention provides, for example, a zoom lens advantageous in a wide angle of view, a high zoom ratio, and a high optical performance at a telephoto end thereof.

The present invention provides a zoom lens that includes in order from an object side to an image side: a first lens unit having a positive refractive power and configured not to move for zooming; a second lens unit having a negative refractive power and configured to move to the image side for zooming from a wide angle end to a telephoto end; and a relay lens unit configured not to move for zooming, wherein the first lens unit consists of five lenses including, in order from the object side to the image side, a negative lens, a positive lens, a positive lens, a positive lens and a positive lens, or six lenses including, in order from the object side to the image side, a positive lens, a negative lens, a positive lens, a positive lens, a positive lens and a positive lens, and conditional expressions

39<νn<48 (1),

2.24<Nn+0.01×νn<2.32 (2),

1.79<Nn<1.91 (3), and

1.5<|fn/f1|<2.0 (4)

are satisfied, where Nn represents a refractive index of the negative lens in the first lens unit, νn represents an Abbe number of the negative lens, fn represents a focal length of the negative lens, and f1 represents a focal length of the first lens unit, the Abbe number ν being expressed by an expression

ν=(Nd−1)/(NF−NC)

where NF, Nd and NC represent refractive indices with respect to an F-line, a d-line and a C-line of Fraunhofer lines, respectively.

Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 1 focuses on an infinite object at a wide angle end.

FIG. 2A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 1 focuses on an infinite object at a wide angle end.

FIG. 2B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 1 focuses on an infinite object at a telephoto end.

FIG. 3 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 2 focuses on an infinite object at a wide angle end.

FIG. 4A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 2 focuses on an infinite object at a wide angle end.

FIG. 4B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 2 focuses on an infinite object at a telephoto end.

FIG. 5 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 3 focuses on an infinite object at a wide angle end.

FIG. 6A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 3 focuses on an infinite object at a wide angle end.

FIG. 6B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 3 focuses on an infinite object at a telephoto end.

FIG. 7 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 4 focuses on an infinite object at a wide angle end.

FIG. 8A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 4 focuses on an infinite object at a wide angle end.

FIG. 8B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 4 focuses on an infinite object at a telephoto end.

FIG. 9 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 5 focuses on an infinite object at a wide angle end.

FIG. 10A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 5 focuses on an infinite object at a wide angle end.

FIG. 10B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 5 focuses on an infinite object at a telephoto end.

FIG. 11 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 6 focuses on an infinite object at a wide angle end.

FIG. 12A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 6 focuses on an infinite object at a wide angle end.

FIG. 12B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 6 focuses on an infinite object at a telephoto end.

FIG. 13 is a sectional view of lenses at the time when a zoom lens in Numerical Embodiment 7 focuses on an infinite object at a wide angle end.

FIG. 14A is an aberration diagram at the time when the zoom lens in Numerical Embodiment 7 focuses on an infinite object at a wide angle end.

FIG. 14B is an aberration diagram at the time when the zoom lens in Numerical Embodiment 7 focuses on an infinite object at a telephoto end.

FIG. 15 is a view for describing an embodiment of an image pickup apparatus of the present invention.

DESCRIPTION OF THE EMBODIMENTS

Preferred embodiments of the present invention will now be described in detail in accordance with the accompanying drawings.

A zoom lens of the present invention includes in order from an object side to an image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to an image side for zooming from a wide angle end to a telephoto end; and a relay lens unit that is arranged closest to the image side and does not move for zooming.

The first lens unit includes in order from an object side to an image side, five lenses of negative, positive, positive, positive and positive lenses, or includes in order from the object side to the image side, six lenses of positive, negative, positive, positive, positive and positive lenses.

When a refractive index of the negative lens of the first lens unit is represented by Nn, the Abbe number is represented by νn, a focal length is represented by fn, and a focal length of the first lens unit is represented by f1, the zoom lens satisfies the following conditional expressions:

39<νn<48 (1),

2.24<Nn+0.01×νn<2.32 (2),

1.79<Nn<1.91 (3), and

1.5<|fn/f1|<2.0 (4)

The Conditional Expressions (1), (2) and (3) specify the characteristics of the optical glass of the negative lenses in the first lens unit. Usually, the optical glass contains many types of metal oxides. The metal oxides include, for instance, SiO₂, TiO₂, La₂O₃, Al₂O₃, Nb₂O₅, ZrO₂and Gd₂O₃. Among them, TiO₂, for instance, has an effect of enhancing the refractive index and reducing the Abbe number, and the glass containing a lot of TiO₂has characteristics of comparatively high refractive index and high dispersion. In addition, Gd₂O₃has an effect of enhancing the refractive index and increasing the Abbe number, and the glass containing a lot of Gd₂O₃is known to have comparatively a high refractive index and low dispersion. TiO₂and Gd₂O₃respectively have the high refractive index and high dispersion and the high refractive index and low dispersion, originally, and characteristics of the glass containing the above substances result in approaching to the characteristics of the original metal oxides.

Thus, the optical glass has such properties that the characteristics vary depending on the amount of the component which the optical glass contains, and an optical glass having desired optical characteristics is obtained by appropriately setting the amounts of the components. This is similar in the optical ceramics, and for instance, optical ceramics containing a lot of substance having high refractive index and low dispersion result in having comparatively high refractive index and low dispersion.

As for substances having the high refractive index and low dispersion, there are, for instance, Gd₂O₃, Al₂O₃and Lu₃Al₅O₁₂. By appropriately setting the amounts of these substances and metal oxides such as SiO₂, TiO₂and La₂O₃, and dissolving or sintering the substances in each other, optical materials such as optical glass and ceramics having desired optical characteristics (refractive index and Abbe number) can be obtained.

In addition, in the zoom lens having the above described zoom configuration, as the focal length approaches the telephoto side, the height of an on-axis light beam of the first lens unit increases in proportion to the focal length. As the height of this axial ray becomes high, the chromatic aberration occurring in the first lens unit is further enlarged, which leads to the deterioration of performance.

Here, when the amount of chromatic aberration of the first lens unit is represented by Δ1 and the imaging magnification of lenses after the first lens unit is represented by βr, the amount Δ of the chromatic aberration in the whole lens system is expressed by the following expression:

Δ=Δ1×βr²+α

where α represents a contribution to the chromatic aberration Δ of units other than the first lens unit. The Δ remarkably occurs in the first lens unit in which the axial marginal ray passes through a high position at the telephoto side. Accordingly, the axial chromatic aberration quantity Δ on the telephoto side can be reduced by suppressing the secondary spectral quantity Δ1 of the axial chromatic aberration which occurs in the first lens unit.

Conditional Expression (1) specifies the condition of the Abbe number of the negative lens which constitutes the first lens unit. If the Abbe number exceeds the lower limit of Conditional Expression (1), the dispersions (Abbe number νd) of the positive lens and the negative lens approach each other within an appropriate range, and the dispersion characteristics (partial dispersion ratio θgf) of the positive lens and the negative lens can be brought closer to each other because of the selection of the glass material, so that the secondary spectral quantity Δ1 of the axial chromatic aberration can be suppressed which is generated in the first lens unit. If the Abbe number exceeds the upper limit of Conditional Expression (1), the refractive power of each of the single lenses in the first lens unit becomes large, and it becomes difficult to correct various aberrations at the telephoto end, particularly, a spherical aberration and comatic aberration. In addition, it becomes difficult to produce a glass material having the low dispersion and high refractive index.

Conditional Expression (1) can be set further as follows.

40<νn<44 (1a)

Conditional Expression (2) specifies a relational expression between the Abbe number and the refractive index of the negative lens which constitutes the first lens unit.

If the value of the relational expression does not satisfy the lower limit of Conditional Expression (2), the glass of the negative lens becomes not to have the high refractive index and low dispersion, which accordingly makes it difficult to adequately correct the chromatic aberration at the telephoto end. If the value of the relational expression exceeds the upper limit of Conditional Expression (2), it becomes difficult to produce a glass material having the low dispersion and high refractive index.

Conditional Expression (2) can be set further as follows.

2.25<Nn+0.01×νn<2.30 (2a)

Conditional Expression (3) specifies the condition of the refractive index of the negative lens which constitutes the first lens unit. If the refractive index does not satisfy the lower limit of Conditional Expression (3), the curvature of the negative lens increases, which accordingly makes it difficult to correct various aberrations at the telephoto end, particularly, the spherical aberration and the comatic aberration. If the refractive index exceeds the upper limit of Conditional Expression (3), it becomes difficult to produce a glass material having the low dispersion and high refractive index.

Conditional Expression (3) can be set further as follows.

1.80<Nn<1.89 (3a)

The Conditional Expression (4) specifies a ratio of the refractive power of the first lens unit to the refractive power of the negative lens which constitutes the first lens unit.

If the ratio does not satisfy the upper limit and the lower limit of the Conditional Expression (4), it becomes difficult to appropriately correct the occurrence of chromatic aberration of the negative lens which constitutes the first lens unit, by the positive lens, and it becomes difficult to correct the axial chromatic aberration and a chromatic aberration of magnification at the telephoto end.

Conditional Expression (4) can be set further as follows.

1.51<|fn/f1|<1.9 (4a)

In a further embodiment of the present invention, the average value νpa of the dispersions of the positive lenses in the first lens unit is specified by Conditional Expression (5).

77<νpa<100 (5)

If the average value νpa is below the lower limit value of Conditional Expression (5), the refractive power of each of the single lenses in the first lens unit becomes large, and it becomes difficult to correct various aberrations at the telephoto end, particularly, the spherical aberration and the comatic aberration.

If the average value νpa is over the upper limit value of Conditional Expression (5), it becomes difficult to produce a low-dispersion glass material. Conditional Expression (5) can be set further as follows.

82<νpa<96 (5a)

In a further embodiment of the present invention, a condition is specified for obtaining a zoom lens that has the high magnification, the wide angle of view, and the high optical performance over the whole zoom range, by specifying the configurations and the refractive powers of the lens units after the third lens unit. By adopting the configuration of Conditional Expression (5), the high magnification can be achieved while the total lens length is kept.

In a further embodiment of the present invention, the condition of the dispersion characteristics of the lens material in the second lens unit is specified by Conditional Expression (6). When the Abbe number and the partial dispersion ratio of the positive lens having the smallest Abbe number out of the positive lenses which constitute the second lens unit are represented by νp2 and θp2, respectively, and the Abbe number and the partial dispersion ratio of the negative lens having the smallest Abbe number out of the negative lenses which constitute the second lens unit are represented by νn2 and θn2, respectively, the positive lens and the negative lens satisfy the following conditional expression of

3.1×10⁻³<(θp2−θn2)/(νn2−νp2)<6.0×10⁻³ (6).

If the value of (θp2−θn2)/(νn2−νp2) does not satisfy the lower limit of Conditional Expression (6), the effect for correcting the occurrence of chromatic aberration of the first lens unit by the second lens unit becomes insufficient, and it becomes difficult to adequately correct a fluctuation of the axial chromatic aberration due to zooming. If the value of (θp2−θn2)/(vn2−vp2) is over the upper limit of Conditional Expression (6), it becomes difficult to adequately correct the fluctuation of the chromatic aberration of magnification due to the chromatic aberration which is generated by the second lens unit. In addition, because the selection of the glass material is limited, the dispersions of the positive lens and the negative lens in the second lens unit become close to each other, and the refractive power of each of the single lenses increases. As a result, it becomes difficult to adequately correct various aberrations at the telephoto end.

Conditional Expression (6) can be set further as follows.

3.4×10⁻³<(θp2−θn2)/(νn2−νp2)<5.6×10⁻³ (6a)

In a further embodiment of the present invention, a ratio between the focal lengths f1 and f2 of the first lens unit and the second lens unit is specified by Conditional Expression (7).

3<|f1/f2|<9 (7)

If the ratio is over the upper limit of Conditional Expression (7), the refractive power of the second lens unit becomes too strong relatively to the refractive power of the first lens unit, the fluctuation of various aberrations increases, which makes it difficult to correct the various aberrations.

If the ratio is below the lower limit of Conditional Expression (7), the refractive power of the second lens unit becomes too weak relatively to the refractive power of the first lens unit, the amount of movement of the second lens unit for zooming increases, which makes it difficult to achieve both of the miniaturization and the high magnification.

Next, the features of each numerical embodiment will be described below.

Embodiment 1

The zoom lens of the Numerical Embodiment 1 of the present invention includes in order from an object side to an image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to an image side for zooming from the wide angle end to the telephoto end; a negative third lens unit that moves for zooming; and a positive relay lens unit for imaging, which does not move for zooming.

The first lens unit includes in order from the object side to the image side, five lenses of negative, positive, positive, positive and positive lenses.

FIG. 1 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 1 of the present invention focuses on an infinite object at the wide angle end. In the sectional view of the lenses, the left side is a subject side (object side), and the right side is an image side.

The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focus adjustment from the infinite distance to a finite distance. The second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end (short focal length end) to the telephoto end (long focal length end). The third lens unit U3 has a negative refractive power and moves for zooming. An aperture stop SP is illustrated. A relay lens unit UR does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and is illustrated as a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 2A and 2B illustrate aberration diagrams at the time when the zoom lens in Numerical Embodiment 1 focuses on the infinite object at the wide angle end and the telephoto end, respectively. In each of the aberration diagrams, the spherical aberration is shown by e-line, g-line, and C-line. The astigmatism is shown by a meridional image plane (M) for the e-line and a sagittal image plane (S) for the e-line. The distortion is shown for the e-line, and the chromatic aberration of magnification is shown for the g-line and the C-line. In addition, the spherical aberration is drawn with a scale of 0.4 mm, the astigmatism with a scale of 0.4 mm, the distortion with a scale of 5%, and the chromatic aberration of magnification with a scale of 0.05 mm. The F number Fno is illustrated, and the half angle of view ω is illustrated. Incidentally, the wide angle end and the telephoto end mean the zoom positions at the time when the zoom lens is positioned in both ends of the range in which the second lens unit U2 (variator lens unit) for zooming can move on the optical axis by the mechanism, respectively. The above description is similar in the following Numerical Embodiments 2 to 7.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 1. Numerical Embodiment 1 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view, and the high optical performance at the telephoto end.

Embodiment 2

A zoom lens of the Numerical Embodiment 2 of the present invention includes in order from the object side to the image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to the image side for zooming from the wide angle end to the telephoto end; a negative third lens unit that moves for zooming; a negative fourth lens unit that moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, five lenses of negative, positive, positive, positive and positive lenses.

FIG. 3 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 2 of the present invention focuses on an infinite object at a wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for the focus adjustment from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. A third lens unit U3 has a negative refractive power and moves for zooming. A fourth lens unit U4 has a negative refractive power and moves for zooming. The aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and is illustrated as a glass block in the figure. An image plane I corresponds to the imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 4A and 4B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 2 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 2. Numerical Embodiment 2 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view and the high optical performance at the telephoto end.

Embodiment 3

The zoom lens of the Numerical Embodiment 3 of the present invention includes in order from an object side to an image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to the image side for zooming from the wide angle end to the telephoto end; a negative third lens unit that moves for zooming; a negative fourth lens unit that moves for zooming; a positive fifth lens unit that moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, six lenses of positive, negative, positive, positive, positive and positive lenses.

FIG. 5 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 3 of the present invention focuses on an infinite object at the wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focusing from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. The third lens unit U3 has a negative refractive power and moves for zooming. A fourth lens unit U4 has a negative refractive power and moves for zooming. A fifth lens unit U5 has a positive refractive power and moves for zooming. An aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and represents a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 6A and 6B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 3 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 3. Numerical Embodiment 3 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view, and the high optical performance at the telephoto end.

Embodiment 4

The zoom lens of the Numerical Embodiment 4 of the present invention includes in order from an object side to an image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to the image side for zooming from the wide angle end to the telephoto end; a negative third lens unit that moves for zooming; a negative fourth lens unit that moves for zooming; a positive fifth lens unit that moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, six lenses of positive, negative, positive, positive, positive and positive lenses.

FIG. 7 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 4 of the present invention focuses on an infinite object at the wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focusing from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. The third lens unit U3 has a negative refractive power and moves for zooming. A fourth lens unit U4 has a negative refractive power and moves for zooming. A fifth lens unit U5 has a positive refractive power and moves for zooming. An aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and represents a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 8A and 8B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 4 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 4. Numerical Embodiment 4 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view, and the high optical performance at the telephoto end.

Embodiment 5

A zoom lens of the Numerical Embodiment 5 of the present invention includes in order from the object side to the image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to the image side for zooming from the wide angle end to the telephoto end; a negative third lens unit that moves for zooming; a positive fourth lens unit that moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, six lenses of positive, negative, positive, positive, positive and positive lenses.

FIG. 9 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 5 of the present invention focuses on an infinite object at the wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focusing from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. The third lens unit U3 has a negative refractive power and moves for zooming. A fourth lens unit U4 has a positive refractive power and moves for zooming. An aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and represents a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 10A and 10B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 5 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 5. Numerical Embodiment 5 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view and the high optical performance at the telephoto end.

Embodiment 6

A zoom lens of the Numerical Embodiment 6 of the present invention includes in order from the object side to the image side: a positive first lens unit that does not move for zooming and moves for focusing; a negative second lens unit that moves to the image side for zooming from the wide angle end to the telephoto end; a positive third lens unit that moves for zooming; a positive fourth lens unit that moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, five lenses of negative, positive, positive, positive and positive lenses.

FIG. 11 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 6 of the present invention focuses on an infinite object at the wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focusing from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. The third lens unit U3 has a positive refractive power and moves for zooming. A fourth lens unit U4 has a positive refractive power and moves for zooming. An aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and represents a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 12A and 12B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 6 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of the conditional expressions in Numerical Embodiment 6. The Numerical Embodiment 6 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view and the high optical performance at the telephoto end.

Embodiment 7

The zoom lens of the Numerical Embodiment 7 of the present invention includes in order from an object side to an image side: a positive first lens unit which does not move for zooming and moves for focusing; a negative second lens unit which moves to the image side for zooming from the wide angle end to the telephoto end; a negative third lens unit which moves for zooming; a positive fourth lens unit which moves for zooming; and a positive relay lens unit that does not move for zooming.

The first lens unit includes in order from the object side to the image side, five lenses of negative, positive, positive, positive and positive lenses.

FIG. 13 is a sectional view of lenses at the time when the zoom lens in Numerical Embodiment 7 of the present invention focuses on an infinite object at the wide angle end. The first lens unit U1 has a positive refractive power and does not move for zooming. A part of the first lens unit moves from the image side to the object side for focusing from the infinite distance to a finite distance. A second lens unit (variator lens unit) U2 has a negative refractive power for zooming and moves to the image side for zooming from the wide angle end to the telephoto end. The third lens unit U3 has a negative refractive power and moves for zooming. A fourth lens unit U4 has a positive refractive power and moves for zooming. An aperture stop SP is illustrated. The relay lens unit UR has a positive refractive power and does not move for zooming. The reference character P corresponds to an optical filter or a color separation optical system, and represents a glass block in the figure. An image plane I corresponds to an imaging plane of the image pickup element (photoelectric conversion element).

FIGS. 14A and 14B illustrate aberration diagrams when the zoom lens in Numerical Embodiment 7 focuses on the infinite object at the wide angle end and the telephoto end, respectively.

Table 1 shows values corresponding to each of conditional expressions in Numerical Embodiment 7. Numerical Embodiment 7 satisfies Conditional Expressions (1) to (7). Thereby, the zoom lens of the present invention achieves a small-sized and lightweight imaging optical system having the high zoom ratio, the wide angle of view and the high optical performance at the telephoto end.

Numeric data of each of the following Numerical Embodiments 1 to 7 is shown. In each of the numerical data, i represents a surface number counted from the object side, ri represents a radius of curvature of the i-th surface from the object side, di represents a distance between the i-th surface and the (i+1)-th surface, ndi and νdi represent a refractive index to d-line (587.6 nm) and the Abbe number of the optical member between the i-th surface and the (i+1)-th surface.

Incidentally, when the refractive indices with respect to the g-line, the F-line, the d-line, and the C-line of the Fraunhofer line are represented by Ng, NF, Nd and NC, definitions of the Abbe number νd and the partial dispersion ratio θgf are represented by the following expressions which are generally used:

νd=(Nd−1)/(NF−NC); and

θgf=(Ng−NF)/(NF−NC).

When an optical axis direction is determined to be an X-axis, a direction perpendicular to the optical axis is determined to be an H-axis, a traveling direction of light is determined to be positive, R represents a paraxial radius of curvature, k represents a conic constant, and A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15 and A16 each represent an aspherical coefficient, an aspherical surface shape is expressed by the following expression.

$X = \frac{H^{2} / R}{1 + \sqrt{1 - (1 + k) {(H / R)}^{2}}} + A 4 H^{4} + A 6 H^{6} + A 8 H^{8} + A 10 H^{10} + A 12 H^{12} + A 14 H^{14} + A 16 H^{16} + A 3 H^{3} + A 5 H^{5} + A 7 H^{7} + A 9 H^{9} + A 11 H^{11} + A 13 H^{13} + A 15 H^{15}$

In addition, in the numerical data, “e-Z” means “×10^−Z”. A mark * attached to the side of the surface number indicates that the optical surface is aspherical.

Numerical Embodiment 1

Unit mm

Surface data

Surface

Effective

number i
ri
di
ndi
vdi
θgFi
diameter
Focal length

1
183.38205
3.00000
1.851500
40.78
0.5695
107.317
−299.999

2
106.20042
1.07300

104.856

3
105.24783
15.02434
1.433870
95.10
0.5373
105.542
277.864

4
779.51784
11.15000

105.422

5
165.31760
6.12449
1.433870
95.10
0.5373
105.304
669.343

6
378.23664
0.20000

105.061

7
160.28421
7.18852
1.433870
95.10
0.5373
104.154
537.649

8
502.55531
0.20000

103.770

9
138.33041
9.68950
1.433870
95.10
0.5373
101.093
358.855

10
1190.11331
(Variable)

100.504

11
78.49053
1.00000
2.003300
28.27
0.5980
29.896
−27.011

12
20.13981
8.91847

25.967

13
−31.92813
0.90000
1.816000
46.62
0.5568
25.580
−42.349

14
−400.35824
0.70000

26.428

15
65.72626
4.13898
1.922860
18.90
0.6495
27.396
38.945

16
−79.02840
2.23382

27.392

17
−66.32430
1.10000
1.816000
46.62
0.5568
26.678
−110.486

18
−249.25223
(Variable)

26.682

19
−47.61650
1.30000
1.717004
47.92
0.5605
28.434
−36.201

20
58.34616
3.27859
1.846490
23.90
0.6217
30.416
79.554

21
400.18520
(Variable)

30.870

22
∞
4.05388

37.218

23
226.67058
6.75742
1.607379
56.81
0.5483
40.360
70.385

24
−52.36155
0.15000

40.885

25
3180.72058
3.29188
1.518229
58.90
0.5457
40.838
231.404

26
−125.09849
0.35000

40.820

27
39.06865
9.43204
1.487490
70.23
0.5300
39.408
58.436

28
−98.06367
1.50000
1.834000
37.17
0.5774
38.312
−121.818

29
−2415.03003
0.15000

37.274

30
36.73108
8.30910
1.487490
70.23
0.5300
34.520
53.864

31
−86.27365
1.50000
1.882997
40.76
0.5667
32.687
−25.097

32
30.30129
50.00000

29.408

33
−120.62916
4.64093
1.517417
52.43
0.5564
31.772
94.501

34
−35.36457
2.54355

32.006

35
63.07563
1.20000
1.785896
44.20
0.5631
29.131
−82.516

36
31.79036
6.49533
1.517417
52.43
0.5564
28.010
48.172

37
−109.65039
2.01000

27.264

38
76.16107
5.44373
1.517417
52.43
0.5564
24.801
48.054

39
−36.25647
1.20000
1.834807
42.71
0.5642
23.497
−24.462

40
48.07162
0.66799

22.402

41
33.72522
4.04093
1.487490
70.23
0.5300
22.524
67.643

42
−1680.64571
3.80000

22.178

43
∞
34.37500
1.608590
46.44
0.5664
31.250

44
∞
13.75000
1.516800
64.17
0.5347
31.250

45
∞
0.00000

31.250

Various data

Zoom ratio 40.00

Wide angle
Middle
Telephoto

Focal length
11.00
69.58
440.00

F number
2.10
2.10
4.10

Half angle of view
26.57
4.52
0.72

Image height
5.50
5.50
5.50

Total lens length
387.49
387.49
387.49

BF
9.54
9.54
9.54

d10
1.22
91.07
120.94

d18
123.69
21.43
12.31

d21
10.16
22.57
1.82

d45
9.54
9.54
9.54

Entrance pupil position
74.99
549.83
2183.07

Exit pupil position
756.96
756.96
756.96

Front principal point position
86.15
625.88
2882.10

Rear principal point position
−1.46
−60.04
−430.46

Zoom lens unit data

Leading

Lens configuration
Front principal point
Rear principal point

Unit
surface
Focal length
length
position
position

1
1
161.84
53.65
26.24
−15.14

2
11
−22.41
18.99
1.63
−13.63

3
19
−66.60
4.58
0.24
−2.27

4
22
87.71
165.66
96.66
−190.05

Single lens data

Lens
Leading surface
Focal length

1
1
−300.00

2
3
277.86

3
5
669.34

4
7
537.65

5
9
358.86

6
11
−27.01

7
13
−42.35

8
15
38.94

9
17
−110.49

10
19
−36.20

11
20
79.55

12
23
70.38

13
25
231.40

14
27
58.44

15
28
−121.82

16
30
53.86

17
31
−25.10

18
33
94.50

19
35
−82.52

20
36
48.17

21
38
48.05

22
39
−24.46

23
41
67.64

24
43

25
44

Numerical Embodiment 2

Unit mm

Surface data

Surface

Effective

number i
ri
di
ndi
vdi
θgFi
diameter
Focal length

1
244.49912
3.00000
1.851500
40.78
0.5695
107.317
−249.990

2
113.50168
1.07300

105.259

3
113.09472
16.49967
1.438750
94.93
0.5340
106.008
225.766

4
−778.08590
11.15000

106.048

5
131.53389
7.09222
1.496999
81.54
0.5375
105.522
499.736

6
273.70166
0.20000

105.178

7
141.78804
8.13059
1.496999
81.54
0.5375
103.917
405.638

8
465.55777
0.20000

103.427

9
263.20879
4.85331
1.496999
81.54
0.5375
102.191
718.636

10
986.38007
(Variable)

101.629

11
228.28308
1.00000
2.003300
28.27
0.5980
29.404
−24.189

12
22.05348
8.46763

25.929

13
−31.93035
0.90000
1.816000
46.62
0.5568
25.788
−40.325

14
−936.02346
0.70000

26.986

15
73.32401
4.25046
1.922860
18.90
0.6495
28.321
40.399

16
−75.60692
(Variable)

28.480

17
−1238.40219
1.10000
1.816000
46.62
0.5568
28.202
−330.976

18
347.80223
(Variable)

28.092

19
−45.71318
1.30000
1.717004
47.92
0.5605
30.776
−35.904

20
60.31471
3.66203
1.846490
23.90
0.6217
33.255
78.338

21
590.34562
(Variable)

33.752

22
∞
4.05388

40.157

23
226.67058
6.75742
1.607379
56.81
0.5483
43.554
70.385

24
−52.36155
0.15000

43.841

25
3180.72058
3.29188
1.518229
58.90
0.5457
43.661
231.404

26
−125.09849
0.35000

43.624

27
39.06865
9.43204
1.487490
70.23
0.5300
41.707
58.436

28
−98.06367
1.50000
1.834000
37.17
0.5774
41.031
−121.818

29
−2415.03003
0.15000

39.789

30
36.73108
8.30910
1.487490
70.23
0.5300
36.369
53.864

31
−86.27365
1.50000
1.882997
40.76
0.5667
34.971
−25.097

32
30.30129
50.00000

31.056

33
−120.62916
4.64093
1.517417
52.43
0.5564
32.985
94.501

34
−35.36457
2.54355

33.186

35
63.07563
1.20000
1.785896
44.20
0.5631
29.880
−82.516

36
31.79036
6.49533
1.517417
52.43
0.5564
28.660
48.172

37
−109.65039
2.01000

27.924

38
76.16107
5.44373
1.517417
52.43
0.5564
25.225
48.054

39
−36.25647
1.20000
1.834807
42.71
0.5642
23.900
−24.462

40
48.07162
0.66799

22.464

41
33.72522
4.04093
1.487490
70.23
0.5300
22.346
75.719

42
362.22377
3.80000

21.915

43
∞
34.37500
1.608590
46.44
0.5664
31.250

44
∞
13.75000
1.516800
64.17
0.5347
31.250

45
∞
0.00000

31.250

Various data

Zoom ratio 40.00

Wide angle
Middle
Telephoto

Focal length
11.00
69.55
440.00

F number
2.10
2.09
4.10

Half angle of view
26.57
4.52
0.72

Image height
5.50
5.50
5.50

Total lens length
401.74
401.74
401.74

BF
10.07
10.07
10.07

d10
0.68
94.56
123.53

d16
0.50
7.52
5.54

d18
141.39
30.16
21.57

d21
9.86
20.19
1.79

d45
10.07
10.07
10.07

Entrance pupil position
69.84
579.13
2533.83

Exit pupil position
−2683.52
−2683.52
−2683.52

Front principal point position
80.80
646.89
2901.96

Rear principal point position
−0.93
−59.48
−429.93

Zoom lens unit data

Leading

Lens configuration
Front principal point
Rear principal point

Unit
surface
Focal length
length
position
position

1
1
161.84
52.20
26.30
−12.92

2
11
−26.93
15.32
−1.30
−15.13

3
17
−330.98
1.10
0.47
−0.13

4
19
−66.60
4.96
0.15
−2.57

5
22
78.88
165.66
76.48
−174.36

Single lens data

Lens
Leading surface
Focal length

1
1
−249.99

2
3
225.77

3
5
499.74

4
7
405.64

5
9
718.64

6
11
−24.19

7
13
−40.32

8
15
40.40

9
17
−330.98

10
19
−35.90

11
20
78.34

12
23
70.38

13
25
231.40

14
27
58.44

15
28
−121.82

16
30
53.86

17
31
−25.10

18
33
94.50

19
35
−82.52

20
36
48.17

21
38
48.05

22
39
−24.46

23
41
75.72

24
43

25
44

Numerical Embodiment 3

Unit mm

Surface data

Surface

Effective

number i
ri
di
ndi
vdi
θgFi
diameter
Focal length

1
210.06296
6.07687
1.433870
95.10
0.5373
114.266
839.438

2
490.30405
1.00000

113.593

3
224.56033
3.00000
1.834807
42.71
0.5642
110.962
−259.997

4
110.00664
1.07300

105.788

5
109.04325
16.13909
1.433870
95.10
0.5373
105.664
256.741

6
4424.50288
11.15000

104.555

7
126.24493
6.11321
1.433870
95.10
0.5373
101.236
800.585

8
195.13718
0.20000

100.517

9
129.34490
9.93743
1.433870
95.10
0.5373
99.584
374.873

10
611.07033
0.20000

98.741

11
154.85895
5.63552
1.433870
95.10
0.5373
95.574
745.713

12
293.07570
(Variable)

94.468

13
65.47852
1.00000
2.001000
29.13
0.5997
31.533
−32.710

14
21.77703
9.28763

27.329

15
−33.08475
0.90000
1.772499
49.60
0.5520
26.228
−29.606

16
76.14260
0.70000

26.527

17
51.41584
5.76983
1.808095
22.76
0.6307
27.066
27.734

18
−38.42118
(Variable)

27.014

19
−31.39479
1.10000
1.772499
49.60
0.5520
26.824
−53.218

20
−132.82260
(Variable)

26.958

21
−46.68721
1.30000
1.717004
47.92
0.5605
26.638
−35.047

22
55.64767
3.15746
1.846490
23.90
0.6217
28.414
74.308

23
437.24951
(Variable)

28.851

24
−2927.66593
4.71791
1.607379
56.81
0.5483
34.908
82.748

25
−49.64514
0.15000

35.462

26
195.10408
3.29607
1.518229
58.90
0.5457
36.055
165.933

27
−153.98173
(Variable)

36.094

28
∞
1.00000

35.520

29
44.79306
9.43204
1.487490
70.23
0.5300
35.148
54.269

30
−60.65636
1.50000
1.834000
37.17
0.5774
34.030
−65.046

31
552.48592
0.15000

33.416

32
22.85959
8.30910
1.487490
70.23
0.5300
32.004
68.066

33
64.22955
1.50000
1.882997
40.76
0.5667
29.477
−36.446

34
21.28610
50.00000

26.518

35
137.04791
4.64093
1.517417
52.43
0.5564
29.348
67.749

36
−46.84111
2.54355

29.298

37
85.64039
1.20000
1.785896
44.20
0.5631
26.827
−49.105

38
26.53665
6.49533
1.517417
52.43
0.5564
25.555
33.780

39
−47.54557
2.01000

25.175

40
−99.45718
5.44373
1.517417
52.43
0.5564
23.364
63.428

41
−25.22374
1.20000
1.834807
42.71
0.5642
22.624
−26.572

42
197.04397
0.66799

22.637

43
28.37669
4.04093
1.487490
70.23
0.5300
22.921
64.833

44
257.13129
3.80000

22513

45
∞
34.37500
1.608590
46.44
0.5664
31.250

46
∞
13.75000
1.516800
64.17
0.5347
31.250

47
∞
0.00000

31.250

Various data

Zoom ratio 40.00

Wide angle
Middle
Telephoto

Focal length
11.00
69.57
440.00

F number
2.10
2.11
4.10

Half angle of view
26.57
4.52
0.72

Image height
5.50
5.50
5.50

Total lens length
386.75
386.75
386.75

BF
7.00
7.00
7.00

d12
4.98
86.61
115.00

d18
0.80
8.33
1.29

d20
116.48
12.76
16.70

d23
10.04
25.02
1.80

d27
3.50
3.08
1.00

d47
7.00
7.00
7.00

Entrance pupil position
93.01
624.56
2842.83

Exit pupil position
387.71
387.71
387.71

Front principal point position
104.33
706.85
3791.34

Rear principal point position
−4.00
−62.58
−433.00

Zoom lens unit data

Leading

Lens configuration
Front principal point
Rear principal point

Unit
surface
Focal length
length
position
position

1
1
161.84
60.53
25.66
−21.45

2
13
−50.34
17.66
−7.25
−26.41

3
19
−53.22
1.10
−0.19
−0.81

4
21
−66.60
4.46
0.20
−2.25

5
24
55.51
8.16
3.42
−1.84

6
28
72.86
152.06
87.20
−55.33

Single lens data

Lens
Leading surface
Focal length

1
1
839.44

2
3
−260.00

3
5
256.74

4
7
800.58

5
9
374.87

6
11
745.71

7
13
−32.71

8
15
−29.61

9
17
27.73

10
19
−53.22

11
21
−35.05

12
22
74.31

13
24
82.75

14
26
165.93

15
29
54.27

16
30
−65.05

17
32
68.07

18
33
−36.45

19
35
67.75

20
37
−49.10

21
38
33.78

22
40
63.43

23
41
−26.57

24
43
64.83

25
45

26
46

Numerical Embodiment 4

Unit mm

Surface data

Surface

Effective
Focal

number i
ri
di
ndi
vdi
θgFi
diameter
length

1
133.75354
6.24833
1.433870
95.10
0.5373
117.583
906.356

2
199.56924
1.00000

116.786

3
189.29688
3.00000
1.804000
46.57
0.5572
116.005
−247.991

4
96.65642
1.07300

109.451

5
95.95230
18.78274
1.433870
95.10
0.5373
109.405
236.880

6
1313.32305
11.15000

108.221

7
136.68838
8.72199
1.433870
95.10
0.5373
100.636
465.603

8
412.37152
0.20000

99.933

9
311.26943
4.86909
1.433870
95.10
0.5373
99.513
1000.056

10
1089.24099
0.20000

98.818

11
121.32814
7.75732
1.433870
95.10
0.5373
94.754
469.565

12
293.07570
(Variable)

93.660

13
58.30507
1.00000
2.000690
25.46
0.6133
33.063
−36.566

14
22.41453
11.31524

28.727

15
−24.84358
0.90000
1.882997
40.76
0.5667
27.351
−35.308

16
−121.61849
0.70000

28.611

17
110.69969
6.30923
1.922860
18.90
0.6495
29.529
37.135

18
−49.14178
(Variable)

29.687

19
−98.78852
1.10000
1.772499
49.60
0.5520
28.773
−66.913

20
110.05178
(Variable)

28.297

21
−51.04264
1.30000
1.717004
47.92
0.5605
28.239
−37.278

22
57.30301
3.13167
1.846490
23.90
0.6217
30.027
84.539

23
269.78672
(Variable)

30.448

24
731.92415
4.50368
1.607379
56.81
0.5483
37.060
151.350

25
−105.38942
0.15000

37.977

26
126.33215
3.53077
1.518229
58.90
0.5457
39.189
175.768

27
−328.12184
(Variable)

39.360

28
∞
1.00000

39.553

29
291.14930
9.43204
1.487490
70.23
0.5300
39.756
71.018

30
−39.02500
1.50000
1.834000
37.17
0.5774
39.875
−190.462

31
−52.53418
0.15000

40.595

32
47.98935
8.30910
1.487490
70.23
0.5300
38.562
57.493

33
−64.06914
1.50000
1.882997
40.76
0.5667
37.940
−47.596

34
125.61994
50.00000

36.767

35
114.54698
4.64093
1.517417
52.43
0.5564
30.568
141.126

36
−201.14117
2.54355

30.036

37
65.92120
1.20000
1.785896
44.20
0.5631
28.417
−85.491

38
33.09437
6.49533
1.517417
52.43
0.5564
27.399
38.823

39
−48.23466
2.01000

26.914

40
−99.31102
5.44373
1.517417
52.43
0.5564
24.165
74.992

41
−28.51659
1.20000
1.834807
42.71
0.5642
22.459
−31.739

42
413.36921
0.66799

21.750

43
40.59485
4.04093
1.487490
70.23
0.5300
21.242
126.119

44
114.83011
3.80000

20.569

45
∞
34.37500
1.608590
46.44
0.5664
31.250

46
∞
13.75000
1.516800
64.17
0.5347
31.250

47
∞
0.00000

31.250

Various data

Zoom ratio 40.00

Wide angle
Middle
Telephoto

Focal length
11.00
69.58
440.00

F number
2.10
2.10
4.10

Half angle of view
26.57
4.52
0.72

Image height
5.50
5.50
5.50

Total lens length
400.14
400.14
400.14

BF
7.00
7.00
7.00

d12
0.70
85.48
112.17

d18
0.48
9.14
0.98

d20
129.42
26.37
28.19

d23
10.04
21.97
1.80

d27
3.50
1.19
1.00

d47
7.00
7.00
7.00

Entrance pupil position
91.53
674.07
3135.55

Exit pupil position
−293.48
−293.48
−293.48

Front principal point
102.13
727.54
2931.25

position

Rear principal point
−4.00
−62.58
−433.00

position

Zoom lens unit data

Leading
Focal
Lens configuration
Front principal point
Rear principal point

Unit
surface
length
length
position
position

1
1
161.84
63.00
26.96
−22.54

2
13
−43.60
20.22
−4.06
−24.07

3
19
−66.91
1.10
0.29
−0.33

4
21
−66.60
4.43
0.40
−2.03

5
24
81.61
8.18
2.98
−23.0

6
28
74.73
152.06
54.70
−89.43

Single lens data

Lens
Leading surface
Focal length

1
1
906.36

2
3
−247.99

3
5
236.88

4
7
465.60

5
9
1000.06

6
11
469.57

7
13
−36.57

8
15
−35.31

9
17
37.14

10
19
−66.91

11
21
−37.28

12
22
84.54

13
24
151.35

14
26
175.77

15
29
71.02

16
30
−190.46

17
32
57.49

18
33
−47.60

19
35
141.13

20
37
−85.49

21
38
38.82

22
40
74.99

23
41
−31.74

24
43
126.12

25
45

26
46

Numerical Embodiment 5

Unit mm

Surface data

Surface

Effective
Focal

number i
ri
di
ndi
vdi
θgFi
diameter
length

1
131.89273
6.37363
1.433870
95.10
0.5373
117.512
884.796

2
197.72254
1.00000

116.708

3
187.56918
3.00000
1.816000
46.62
0.5568
115.920
−247.992

4
96.87752
1.07300

109.392

5
96.25984
18.75418
1.433870
95.10
0.5373
109.339
236.775

6
1386.50807
11.15000

108.150

7
135.72353
7.39036
1.433870
95.10
0.5373
100.489
586.041

8
285.49472
0.20000

99.785

9
233.53768
6.20429
1.433870
95.10
0.5373
99.416
684.621

10
1073.75429
0.20000

98.714

11
122.66344
7.65578
1.433870
95.10
0.5373
94.674
478.488

12
293.07570
(Variable)

93.568

13
66.75163
1.00000
2.000690
25.46
0.6133
34.240
−38.193

14
24.26271
11.50930

29.904

15
−25.64238
0.90000
1.882997
40.76
0.5667
28.456
−41.416

16
−86.06041
0.70000

29.645

17
144.31474
6.46147
1.922860
18.90
0.6495
30.374
37.445

18
−45.18018
0.48366

30.467

19
−87.69877
1.10000
1.772499
49.60
0.5520
29.161
−52.021

20
75.24507
(Variable)

28.389

21
−54.09102
1.30000
1.717004
47.92
0.5605
27.970
−37.685

22
55.07687
3.05060
1.846490
23.90
0.6217
29.628
86.344

23
211.47936
(Variable)

30.022

24
328.70349
3.42086
1.607379
56.81
0.5483
37.141
215.706

25
−218.50217
0.15000

37.834

26
112.27618
4.26968
1.518229
58.90
0.5457
38.995
296.377

27
407.49715
(Variable)

39.464

28
∞
1.00000

39.612

29
163.01054
9.43204
1.487490
70.23
0.5300
40.259
61.086

30
−35.89070
1.50000
1.834000
37.17
0.5774
40.469
−180.299

31
−47.94674
0.15000

41.484

32
72.01768
8.30910
1.487490
70.23
0.5300
40.112
61.893

33
−50.25206
1.50000
1.882997
40.76
0.5667
39.688
−60.779

34
−737.80496
50.00000

39.418

35
66.05279
4.64093
1.517417
52.43
0.5564
31.919
148.393

36
448.87983
2.54355

31.141

37
83.61369
1.20000
1.785896
44.20
0.5631
29.816
−89.262

38
38.01535
6.49533
1.517417
52.43
0.5564
28.832
41.578

39
−47.15253
2.01000

28.411

40
−99.41582
5.44373
1.517417
52.43
0.5564
25.441
71.858

41
−27.65806
1.20000
1.834807
42.71
0.5642
23.866
−31.421

42
580.49114
0.66799

23.155

43
49.30343
4.04093
1.501270
56.50
0.5536
22.608
118.529

44
276.10611
3.80000

21.573

45
∞
34.37500
1.608590
46.44
0.5664
31.250

46
∞
13.75000
1.516800
64.17
0.5347
31.250

47
∞
0.00000

31.250

Various data

Zoom ratio 40.00

Wide angle
Middle
Telephoto

Focal length
11.00
69.58
440.00

F number
2.10
2.10
4.10

Half angle of view
26.57
4.52
0.72

Image height
5.50
5.50
5.50

Total lens length
403.26
403.26
403.26

BF
10.00
10.00
10.00

d12
0.97
85.81
111.56

d20
129.35
35.23
28.64

d23
10.04
20.40
1.78

d27
3.50
2.41
1.87

d47
10.00
10.00
10.00

Entrance pupil position
93.27
672.83
3155.82

Exit pupil position
−257.62
−257.62
−257.62

Front principal point
103.82
724.32
2872.40

position

Rear principal point
−1.00
−59.58
−430.00

position

Zoom lens unit data

Lens
Front
Rear

Leading
Focal
configuration
principal point
principal point

Unit
surface
length
length
position
position

1
1
161.84
63.00
26.76
−22.74

2
13
−21.52
22.15
4.50
−11.97

3
21
−66.60
4.35
0.52
−1.86

4
24
124.83
7.84
1.25
−3.82

5
28
67.44
152.06
47.19
−100.49

Single lens data

Lens
Leading surface
Focal length

1
1
884.80

2
3
−247.99

3
5
236.77

4
7
586.04

5
9
684.62

6
11
478.49

7
13
−38.19

8
15
−41.42

9
17
37.44

10
19
−52.02

11
21
−37.68

12
22
86.34

13
24
215.71

14
26
296.38

15
29
61.09

16
30
−180.30

17
32
61.89

18
33
−60.78

19
35
148.39

20
37
−89.26

21
38
41.58

22
40
71.86

23
41
−31.42

24
43
118.53

25
45

26
46

Numerical Embodiment 6

Unit mm

Surface data

Surface

Effective
Focal

number i
ri
di
ndi
vdi
θgFi
diameter
length

1
−25110.14280
6.00000
1.834807
42.73
0.5648
203.582
−384.675

2
327.15837
1.59003

196.726

3
321.68109
32.56730
1.433870
95.10
0.5373
196.600
421.518

4
−413.25245
32.25814

195.291

5
337.42453
16.36645
1.433870
95.10
0.5373
195.265
844.528

6
4082.93537
0.25000

194.793

7
258.04199
22.27056
1.433870
95.10
0.5373
191.328
582.698

8
−13870.84436
1.20000

189.995

9
165.53266
15.30800
1.433870
95.10
0.5373
175.221
819.559

10
300.37387
(Variable)

173.007

11
572.85560
2.35000
1.882997
40.76
0.5667
50.043
−51.767

12
42.47898
18.65241

43.343

13
−34.32253
1.45000
1.772499
49.60
0.5520
39.087
−63.653

14
−114.48795
7.69984
1.808095
22.76
0.6307
41.807
71.425

15
−39.80319
0.19709

43.607

16
−58.21530
2.00000
1.696797
55.53
0.5434
43.680
−91.477

17
−651.73077
(Variable)

45.694

18
517.79308
7.28014
1.603112
60.64
0.5415
80.813
285.620

19
−258.28628
1.00500

81.995

20
138.30845
20.76855
1.438750
94.93
0.5340
86.072
149.814

21
−120.09002
9.59366

86.322

22
170.24037
2.50000
1.717362
29.52
0.6047
79.879
−156.766

23
67.62775
8.82607
1.438750
94.93
0.5340
76.353
359.235

24
113.51550
(Variable)

75.695

25
294.14761
14.10652
1.593490
67.00
0.5361
77.245
147.839

26
−123.42655
(Variable)

76.840

27
∞
4.92616

33.372

28
−69.17507
1.80000
1.816000
46.62
0.5568
31.665
−39.799

29
62.53126
5.11643
1.808095
22.76
0.6307
31.262
58.913

30
−200.73400
7.41605

31.083

31
−28.94191
1.49977
1.816000
46.62
0.5568
30.102
−25.444

32
76.55422
9.97320
1.548141
45.79
0.5686
33.098
38.975

33
−28.46614
15.63678

34.429

34
162.87792
9.19327
1.531717
48.84
0.5631
36.429
65.718

35
−43.88345
1.78139

36.342

36
−90.37000
1.50000
1.882997
40.76
0.5667
33.978
−33.943

37
45.59080
8.60872
1.518229
58.90
0.5457
33.317
43.578

38
−42.19588
0.59328

33.433

39
170.24410
6.58015
1.496999
81.54
0.5375
31.604
56.333

40
−33.19308
1.50000
1.882997
40.76
0.5667
30.967
−40.510

41
−437.83142
0.56165

30.865

42
82.70616
5.72967
1.522494
59.84
0.5440
30.636
71.005

43
−66.15100
10.00000

30.136

44
∞
33.00000
1.608590
46.44
0.5664
40.000

45
∞
13.20000
1.516330
64.14
0.5353
40.000

46
∞
0.00000

50.000

Aspherical surface data

Eleventh surface

K = −5.06977e+002
A 4 = 8.85363e−007
A 6 = −2.49171e−010
A 8 = 2.80963e−014

Eighteenth surface

K = −7.54553e−001
A 4 = −3.41767e−007
A 6 = −4.00004e−012
A 8 = −4.18689e−015

Various data

Zoom ratio 79.99

Wide angle
Middle
Telephoto

Focal length
10.00
89.44
799.90

F number
1.80
1.80
4.20

Half angle of view
28.81
3.52
0.39

Image height
5.50
5.50
5.50

Total lens length
725.60
725.60
725.60

BF
11.72
11.72
11.72

d10
2.94
142.63
180.77

d17
325.65
138.28
2.78

d24
12.28
30.65
67.33

d26
10.14
39.46
100.14

d46
11.72
11.72
11.72

Entrance pupil position
147.70
1072.75
11741.95

Exit pupil position
−24235.14
−24235.14
−24235.14

Front principal point
157.70
1161.86
12515.46

position

Rear principal point
1.72
−77.71
−788.18

position

Zoom lens unit data

Lens
Front
Rear

Leading
Focal
configuration
principal point
principal point

Unit
surface
length
length
position
position

1
1
246.00
127.81
74.83
−19.86

2
11
−28.50
32.35
6.49
−18.82

3
18
137.46
49.97
−5.27
−38.64

4
25
147.84
14.11
6.31
−2.65

5
27
61.57
138.62
61.41
9.03

Single lens data

Lens
Leading surface
Focal length

1
1
−384.67

2
3
421.52

3
5
844.53

4
7
582.70

5
9
819.56

6
11
−51.77

7
13
−63.65

8
14
71.43

9
16
−91.48

10
18
285.62

11
20
149.81

12
22
−156.77

13
23
359.23

14
25
147.84

15
28
−39.80

16
29
58.91

17
31
−25.44

18
32
38.98

19
34
65.72

20
36
−33.94

21
37
43.58

22
39
56.33

23
40
−40.51

24
42
71.00

25
44

26
45

Numerical Embodiment 7

Unit mm

Surface data

Surface

Effective
Focal

number i
ri
di
ndi
vdi
θgFi
diameter
length

1
−462.31573
2.20000
1.882997
40.76
0.5667
90.027
−99.360

2
109.30856
3.35229

84.667

3
134.13128
16.02660
1.433870
95.10
0.5373
84.615
158.763

4
−137.17894
9.04050

84.045

5
150.39507
9.19607
1.433870
95.10
0.5373
76.162
217.082

6
−249.00153
0.15000

75.319

7
85.12758
8.06231
1.433870
95.10
0.5373
65.103
190.346

8
−2931.92466
0.15000

64.216

9
51.61386
7.85260
1.433870
95.10
0.5373
56.925
151.459

10
227.37570
(Variable)

56.124

11
−310.32731
0.90000
2.003300
28.27
0.5980
21.898
−14.674

12
15.61403
4.60329

18.399

13
−41.15275
5.79711
1.922860
18.90
0.6495
18.204
21.411

14
−14.37680
0.70000
1.882997
40.76
0.5667
18.379
−13.868

15
87.92415
0.20000

18.453

16
30.36409
3.06348
1.666800
33.05
0.5957
18.716
46.956

17
784.99832
(Variable)

18.504

18
−41.83358
0.70000
1.756998
47.82
0.5565
18.798
−21.101

19
26.23641
2.75535
1.846490
23.90
0.6217
20.059
48.795

20
67.29618
(Variable)

20.482

21
−183.99508
4.04673
1.638539
55.38
0.5484
23.483
47.183

22
−26.20784
0.15000

24.273

23
−230.48273
2.46359
1.516330
64.14
0.5353
24.977
157.695

24
−60.55272
(Variable)

25.276

25
∞
1.30000

25.479

26
32.16093
6.87396
1.517417
52.43
0.5564
25.836
35.421

27
−39.91453
0.90000
1.834807
42.71
0.5642
25.339
−35.813

28
123.06847
32.40000

25.068

29
66.78446
5.69362
1.496999
81.54
0.5375
26.152
55.622

30
−46.06015
2.22280

25.871

31
200.96524
1.40000
1.834030
37.20
0.5775
24.243
−25.397

32
19.21121
5.63992
1.487490
70.23
0.5300
23.274
47.224

33
103.12642
1.93515

23.532

34
1557.71280
7.31033
1.501270
56.50
0.5536
23.895
33.202

35
−16.86785
1.40000
1.834807
42.71
0.5642
24.271
−34.757

36
−41.49741
0.14985

26.400

37
104.48429
6.21013
1.501270
56.50
0.5536
27.470
45.563

38
−28.80137
4.00000

27.695

39
∞
33.00000
1.608590
46.44
0.5664
40.000

40
∞
13.20000
1.516330
64.14
0.5353
40.000

41
∞
0.00000

40.000

Various data

Zoom ratio 17.00

Wide angle
Middle
Telephoto

Focal length
8.00
33.07
136.00

F number
1.91
1.94
2.50

Half angle of view
34.51
9.44
2.32

Image height
5.50
5.50
5.50

Total lens length
270.34
270.34
270.34

BF
7.49
7.49
7.49

d10
1.05
33.34
48.74

d17
51.11
6.20
3.09

d20
4.70
10.23
2.88

d24
0.95
8.03
3.09

d41
7.49
7.49
7.49

Entrance pupil position
51.60
164.87
543.25

Exit pupil position
196.81
196.81
196.81

Front principal point
59.94
203.72
776.95

position

Rear principal point
−0.51
−25.58
−128.51

position

Zoom lens unit data

Lens
Front
Rear

Leading
Focal
configuration
principal point
principal point

Unit
surface
length
length
position
position

1
1
65.01
56.03
35.83
−0.11

2
11
−13.49
15.26
0.20
−10.77

3
18
−36.17
3.46
0.81
−1.04

4
21
36.66
6.66
3.30
−0.93

5
25
51.48
123.64
65.08
−49.62

Single lens data

Lens
Leading surface
Focal length

1
1
−99.36

2
3
158.76

3
5
217.08

4
7
190.35

5
9
151.46

6
11
−14.67

7
13
21.41

8
14
−13.87

9
16
46.96

10
18
−21.10

11
19
48.80

12
21
47.18

13
23
157.70

14
26
35.42

15
27
−35.81

16
29
55.62

17
31
−25.40

18
32
47.22

19
34
33.20

20
35
−34.76

21
37
45.56

22
39

23
40

TABLE 1

Numerical values corresponding to each of conditional expressions in Numerical

Embodiments 1 to 7

Numerical embodiment

Conditional expression
1
2
3
4
5
6
7

(1)
νn
40.78
40.78
42.71
46.57
46.62
42.73
40.76

(2)
Nn + 0.01 × νn
2.259
2.259
2.262
2.270
2.282
2.262
2.291

(3)
Nn
1.852
1.852
1.835
1.804
1.816
1.835
1.883

(4)
|fn/f1|
1.85
1.54
1.61
1.53
1.53
1.56
1.53

(5)
vpa
95.10
84.89
95.10
95.10
95.10
95.10
95.10

(6)
(θp2 − θn2)/(νn2 − νp2)
0.00550
0.00550
0.00487
0.00552
0.00552
0.00356
0.00550

(7)
|f1/f2|
7.22
6.01
3.22
3.71
7.52
8.63
4.82

Embodiment 8

(Image Pickup Apparatus)

FIG. 15 illustrates a schematic view of an image pickup apparatus (television camera system) which uses the zoom lens of any one of Embodiments 1 to 7 as a photographing optical system. In FIG. 15, a zoom lens 101 is any one of zoom lenses in Embodiments 1 to 7. A camera 124 is shown. The zoom lens 101 is structured so as to be detachable from the camera 124. An image pickup apparatus 125 is structured by the camera 124 and the zoom lens 101 which is mounted thereon. The zoom lens 101 has a first lens unit F for focusing, a zooming lens unit LZ, and a relay lens unit UR for imaging. The zooming lens unit LZ includes a lens unit which moves for zooming. An aperture stop SP is illustrated. A driving mechanism 115 such as a helicoid and a cam drives the zooming lens unit LZ in the optical axis direction. Motors (driving unit) 117 and 118 electrically drive the driving mechanism 115 and the aperture stop SP. Detectors 120 and 121 such as an encoder, a potentiometer and a photosensor detect a position on the optical axis of the zooming lens unit LZ and an aperture diameter of the aperture stop SP. In the camera 124, a glass block 109 corresponds to an optical filter or a color separation optical system in the camera 124, and a solid-state image pickup element 110 (photoelectric conversion element) is a CCD sensor, a CMOS sensor or the like, and receives light of a subject image which has been formed by the zoom lens 101. Incidentally, when the electronic image pickup element is used, an output image can be further enhanced to a high image quality by an operation of electronically correcting the aberration. In addition, CPUs 111 and 122 control various drives of the camera 124 and the zoom lens 101.

Thus, when being applied to a digital video camera, a TV camera or a camera for cinema, the zoom lens according to the present invention achieves an image pickup apparatus having a high optical performance.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

This application claims the benefit of Japanese Patent Application No. 2017-007596, filed Jan. 19, 2017 which is hereby incorporated by reference herein in its entirety.

ZOOM LENS, AND IMAGE PICKUP APPARATUS

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Abstract

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Priority Claims (1)