Zoom lens system and image pickup apparatus using the same

Abstract

A zoom lens system comprises, in order from an object side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, and during magnification change from a wide-angle end to a telephoto end, each of the space between the respective lens units changes.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given below and the accompanying drawings, which are given by way of illustration only and thus are not limitative of the present invention, wherein:

FIGS. 1A to 1C are sectional views of Example 1 of the present invention along an optical axis, FIG. 1A is a diagram showing a state in a wide-angle end, FIG. 1B is a diagram showing an intermediate position, and FIG. 1C is a diagram showing a state in a telephoto end;

FIGS. 2A to 2C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 1 when focused on an infinite object, FIG. 2A is a diagram showing the state in the wide-angle end, FIG. 2B is a diagram showing the intermediate position, and FIG. 2C is a diagram showing a state in the telephoto end;

FIGS. 3A to 3C are sectional views of Example 2 of the present invention along an optical axis, FIG. 3A is a diagram showing a state in a wide-angle end, FIG. 3B is a diagram showing an intermediate position, and FIG. 3C is a diagram showing a state in a telephoto end;

FIGS. 4A to 4C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 2 when focused on an infinite object, FIG. 4A is a diagram showing the state in the wide-angle end, FIG. 4B is a diagram showing the intermediate position, and FIG. 4C is a diagram showing a state in the telephoto end;

FIGS. 5A to 5C are sectional views of Example 3 of the present invention along an optical axis, FIG. 5A is a diagram showing a state in a wide-angle end, FIG. 5B is a diagram showing an intermediate position, and FIG. 5C is a diagram showing a state in a telephoto end;

FIGS. 6A to 6C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 3 when focused on an infinite object, FIG. 6A is a diagram showing the state in the wide-angle end, FIG. 6B is a diagram showing the intermediate position, and FIG. 6C is a diagram showing a state in the telephoto end;

FIGS. 7A to 7C are sectional views of Example 4 of the present invention along an optical axis, FIG. 7A is a diagram showing a state in a wide-angle end, FIG. 7B is a diagram showing an intermediate position, and FIG. 7C is a diagram showing a state in a telephoto end;

FIGS. 8A to 8C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 4 when focused on an infinite object, FIG. 8A is a diagram showing the state in the wide-angle end, FIG. 8B is a diagram showing the intermediate position, and FIG. 8C is a diagram showing a state in the telephoto end;

FIGS. 9A to 9C are sectional views of Example 5 of the present invention along an optical axis, FIG. 9A is a diagram showing a state in a wide-angle end, FIG. 9B is a diagram showing an intermediate position, and FIG. 9C is a diagram showing a state in a telephoto end;

FIGS. 10A to 10C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 5 when focused on an infinite object, FIG. 10A is a diagram showing the state in the wide-angle end, FIG. 10B is a diagram showing the intermediate position, and FIG. 10C is a diagram showing a state in the telephoto end;

FIGS. 11A to 11C are sectional views of Example 6 of the present invention along an optical axis, FIG. 11A is a diagram showing a state in a wide-angle end, FIG. 11B is a diagram showing an intermediate position, and FIG. 11C is a diagram showing a state in a telephoto end;

FIGS. 12A to 12C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 6 when focused on an infinite object, FIG. 12A is a diagram showing the state in the wide-angle end, FIG. 12B is a diagram showing the intermediate position, and FIG. 12C is a diagram showing a state in the telephoto end;

FIGS. 13A to 13C are sectional views of Example 7 of the present invention along an optical axis, FIG. 13A is a diagram showing a state in a wide-angle end, FIG. 13B is a diagram showing an intermediate position, and FIG. 13C is a diagram showing a state in a telephoto end;

FIGS. 14A to 14C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 7 when focused on an infinite object, FIG. 14A is a diagram showing the state in the wide-angle end, FIG. 14B is a diagram showing the intermediate position, and FIG. 14C is a diagram showing a state in the telephoto end;

FIGS. 15A to 15C are sectional views of Example 8 of the present invention along an optical axis, FIG. 15A is a diagram showing a state in a wide-angle end, FIG. 15B is a diagram showing an intermediate position, and FIG. 15C is a diagram showing a state in a telephoto end;

FIGS. 16A to 16C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 8 when focused on an infinite object, FIG. 16A is a diagram showing the state in the wide-angle end, FIG. 16B is a diagram showing the intermediate position, and FIG. 16C is a diagram showing a state in the telephoto end;

FIGS. 17A to 17C are sectional views of Example 9 of the present invention along an optical axis, FIG. 17A is a diagram showing a state in a wide-angle end, FIG. 17B is a diagram showing an intermediate position, and FIG. 17C is a diagram showing a state in a telephoto end;

FIGS. 18A to 18C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 9 when focused on an infinite object, FIG. 18A is a diagram showing the state in the wide-angle end, FIG. 18B is a diagram showing the intermediate position, and FIG. 18C is a diagram showing a state in the telephoto end;

FIGS. 19A to 19C are sectional views of Example 10 of the present invention along an optical axis, FIG. 19A is a diagram showing a state in a wide-angle end, FIG. 19B is a diagram showing an intermediate position, and FIG. 19C is a diagram showing a state in a telephoto end;

FIGS. 20A to 20C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 10 when focused on an infinite object, FIG. 20A is a diagram showing the state in the wide-angle end, FIG. 20B is a diagram showing the intermediate position, and FIG. 20C is a diagram showing a state in the telephoto end;

FIGS. 21A to 21C are sectional views of Example 11 of the present invention along an optical axis, FIG. 21A is a diagram showing a state in a wide-angle end, FIG. 21B is a diagram showing an intermediate position, and FIG. 21C is a diagram showing a state in a telephoto end;

FIGS. 22A to 22C are sectional views of Example 12 of the present invention along an optical axis, FIG. 22A is a diagram showing a state in a wide-angle end, FIG. 22B is a diagram showing an intermediate position, and FIG. 22C is a diagram showing a state in a telephoto end;

FIGS. 23A to 23C are sectional views of Example 13 of the present invention along an optical axis, FIG. 23A is a diagram showing a state in a wide-angle end, FIG. 23B is a diagram showing an intermediate position, and FIG. 23C is a diagram showing a state in a telephoto end;

FIGS. 24A to 24C are sectional views of Example 14 of the present invention along an optical axis, FIG. 24A is a diagram showing a state in a wide-angle end, FIG. 24B is a diagram showing an intermediate position, and FIG. 24C is a diagram showing a state in a telephoto end;

FIGS. 25A to 25C are sectional views of Example 15 of the present invention along an optical axis, FIG. 25A is a diagram showing a state in a wide-angle end, FIG. 25B is a diagram showing an intermediate position, and FIG. 25C is a diagram showing a state in a telephoto end;

FIGS. 26A to 26C are sectional views of Example 16 of the present invention along an optical axis, FIG. 26A is a diagram showing a state in a wide-angle end, FIG. 26B is a diagram showing an intermediate position, and FIG. 26C is a diagram showing a state in a telephoto end;

FIGS. 27A to 27C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 11 when focused on an infinite object, FIG. 27A is a diagram showing the state in the wide-angle end, FIG. 27B is a diagram showing the intermediate position, and FIG. 27C is a diagram showing a state in the telephoto end;

FIGS. 28A to 28C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 12 when focused on an infinite object, FIG. 28A is a diagram showing the state in the wide-angle end, FIG. 28B is a diagram showing the intermediate position, and FIG. 28C is a diagram showing a state in the telephoto end;

FIGS. 29A to 29C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 13 when focused on an infinite object, FIG. 29A is a diagram showing the state in the wide-angle end, FIG. 29B is a diagram showing the intermediate position, and FIG. 29C is a diagram showing a state in the telephoto end;

FIGS. 30A to 30C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 14 when focused on an infinite object, FIG. 30A is a diagram showing the state in the wide-angle end, FIG. 30B is a diagram showing the intermediate position, and FIG. 30C is a diagram showing a state in the telephoto end;

FIGS. 31A to 31C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 15 when focused on an infinite object, FIG. 31A is a diagram showing the state in the wide-angle end, FIG. 31B is a diagram showing the intermediate position, and FIG. 31C is a diagram showing a state in the telephoto end;

FIGS. 32A to 32C are aberration diagrams showing a spherical aberration (SA), an astigmatism (FC), a distortion (DT) and a chromatic aberration of magnification (CC) of Example 16 when focused on an infinite object, FIG. 32A is a diagram showing the state in the wide-angle end, FIG. 32B is a diagram showing the intermediate position, and FIG. 32C is a diagram showing a state in the telephoto end;

2006-108782

FIG. 33 is an explanatory view showing a basic concept for digitally correcting a distortion of an image;

FIG. 34 is a diagram showing a relation between an incidence angle of a ray with respect to an optical axis and an image height;

FIG. 35 is a front perspective view showing an appearance of a digital camera to which the zoom lens system of the present invention is applied;

FIG. 36 is a rear view of the digital camera of FIG. 35;

FIG. 37 is a schematic diagram showing a constitution of the digital camera of FIG. 35;

FIG. 38 is a block diagram showing a constitution of a part of an inner circuit of the digital camera;

2006-102735

FIG. 39 is a schematic block diagram showing a main part of a control system of the digital camera;

FIG. 40 is a front view of a cellular phone;

FIG. 41 is a side view of the cellular phone;

FIG. 42 is a sectional view of a photographing optical system incorporated in the cellular phone; and

FIG. 43 is a schematic block diagram showing a main part of a control system related to photographing, image recording and image display of the cellular phone.

Claims

1. A zoom lens system comprising, in order from an object side: a first lens unit having a positive refractive power;a second lens unit having a negative refractive power;a third lens unit having a positive refractive power;a fourth lens unit having a negative refractive power; anda fifth lens unit having a positive refractive power,wherein during magnification change from a wide-angle end to a telephoto end,each of spaces between the respective lens units changes;in the telephoto end as compared with the wide-angle end,the space between the first lens unit and the second lens unit increases, andthe space between the second lens unit and the third lens unit decreases; andthe first lens unit includes one lens component;the second lens unit includes a positive lens and a negative lens; andthe total number of the lenses constituting the first lens unit and the second lens unit is four or less, andwherein the lens component is defined as a single lens or a combination of lenses which has only two air contact surfaces including an object-side surface and an image-side surface in an effective diameter.

2. The zoom lens system according to claim 1, wherein the first lens unit satisfies the following conditions: 2.40<f1/fw<8.00; and0.45<f1/ft<2.00,

3. An image pickup apparatus comprising: the zoom lens system according to claim 1; andan electronic image sensor which is disposed on an image side of the zoom lens system and which picks up an image formed by the zoom lens system and converts the image into an electric signal.

4. A zoom lens system comprising, in order from an object side: a first lens unit having a positive refractive power;a second lens unit having a negative refractive power;a third lens unit having a positive refractive power;a fourth lens unit having a negative refractive power; anda fifth lens unit having a positive refractive power,wherein during magnification change from a wide-angle end to a telephoto end,each of the space between the respective lens units changes.in the telephoto end as compared with the wide-angle end,the space between the first lens unit and the second lens unit increases, andthe space between the second lens unit and the third lens unit decreases;the second lens unit is positioned closer to an image side in the telephoto end than in the wide-angle end;the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end; andthe following conditions are satisfied: 3.00<Lw/fw<9.90; and0.50<Lt/ft<2.25,

5. The zoom lens system according to claim 4, wherein the following conditions are satisfied: −1.35<f2/t<−0.40; and−1.00<f2/ft<−0.10,

6. The zoom lens system according to claim 4, wherein the following conditions are satisfied: 0.80<f3/fw<2.40; and0.10<f3/ft<1.00,

7. An image pickup apparatus comprising: the zoom lens system according to claim 4; andan electronic image sensor which is disposed on an image side of the zoom lens system and which picks up an image formed by the zoom lens system and converts the image into an electric signal.

8. A zoom lens system comprising, in order from an object side: a first lens unit having a positive refractive power;a second lens unit having a negative refractive power;a third lens unit having a positive refractive power;a fourth lens unit having a negative refractive power; anda fifth lens unit having a positive refractive power,wherein during magnification change from a wide-angle end to a telephoto end,each of the space between the respective lens units changes.the first lens unit moves so as to be disposed closer to the object side in the telephoto end than in the wide-angle end;the fifth lens unit moves so as to be disposed closer to an image side in the telephoto end than in the wide-angle end; andan axial space between the third lens unit and the fourth lens unit increases from the wide-angle end to an intermediate position, and decreases from the intermediate position to the telephoto end; and whereinthe intermediate position means any position between the wide-angle end and the telephoto end.

9. The zoom lens system according to claim 8, wherein the following condition is satisfied: 4.00<Lw/fw<9.00,

10. The zoom lens system according to claim 8, wherein the following condition is satisfied: 1.00<Lt/ft<1.80,

11. The zoom lens system according to claim 8, wherein the first lens unit includes one positive lens.

12. The zoom lens system according to claim 11, wherein the positive lens of the first lens unit satisfies the following condition: 75.0<vd1p<105.0,

13. The zoom lens system according to claim 11, wherein the positive lens of the first lens unit satisfies the following condition: −1.50<SF1p<−0.20,

14. The zoom lens system according to claim 8, wherein the second lens unit includes, in order from the object side, a first negative lens, a second negative lens and a positive lens.

15. The zoom lens system according to claim 14, wherein a concave surface of the first negative lens faces the image side; a concave surface of the second negative lens faces the object side; andthe second negative lens and the positive lens are cemented with each other.

16. An image pickup apparatus comprising: the zoom lens system according to claim 8;an electronic image sensor; andimage processing unit for processing image data obtained by picking up, with the electronic image sensor, an image formed by the zoom lens system and outputting an deformed image data,wherein the zoom lens system satisfies the following condition when focused on an infinite object: 0.850<y07/(fw·tan ω07w)<0.970,

17. An electronic image pickup apparatus comprising: the zoom lens system according to claim 8; andan image sensor disposed in a position where an object image formed by the zoom lens system is received.

18. An information processing apparatus comprising: the zoom lens system according to claim 8;an image sensor disposed in a position where an object image formed by the zoom lens system is received;a CPU which processes an electric signal photoelectrically converted by the image sensor;an input section for an operator to input an information signal to be input into the CPU;a display processing section for displaying an output from the CPU in a display device; anda recording medium which records the output from the CPU,wherein the CPU is configured to perform control so as to display the object image received by the image sensor in the display unit.

19. The information processing apparatus according to claim 18, which is a portable terminal device.

20. An electronic camera device comprising: the zoom lens system according to claim 8;an image sensor disposed in a position where an object image formed by the zoom lens system is received;a CPU which processes an electric signal photoelectrically converted by the image sensor;a display unit which observably displays the object image received by the image sensor;a recording processing section which records the object image received by the image sensor in a recording medium; andthe recording medium which is incorporated in the electronic camera and/or detachably attached to the electronic camera in order to record image information of the object image received by the image sensor,the CPU being configured to execute control so as to display the object image received by the image sensor in the display unit and record the object image received by the image sensor in the recording medium.