ZOOM LENS AND OPTICAL APPARATUS HAVING THE SAME

Abstract

At least one exemplary embodiment is directed to a zoom lens including a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming, an aperture stop, and a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate some exemplary embodiments and features of the invention and, together with the description, serve to explain some of the principles of the invention.

FIG. 1 illustrates a paraxial refractive power arrangement of a zoom lens according to a first exemplary embodiment of the present invention.

FIG. 2 illustrates a paraxial refractive power arrangement of a zoom lens according to the first exemplary embodiment of the present invention.

FIG. 3 illustrates a paraxial refractive power arrangement of a zoom lens according to a second exemplary embodiment of the present invention.

FIG. 4 illustrates a paraxial refractive power arrangement of a zoom lens according to the second exemplary embodiment of the present invention.

FIG. 5 illustrates an optical action of a zoom lens according to an exemplary embodiment of the present invention.

FIG. 6 illustrates an optical cross section of a zoom lens according to a numerical example 1 of the present invention.

FIGS. 7A through 7C are aberration charts of the zoom lens according to the numerical example 1 of the present invention.

FIG. 8 illustrates an optical cross section of a zoom lens according to a numerical example 2 of the present invention.

FIGS. 9A through 9C are aberration charts of the zoom lens according to the numerical example 2 of the present invention.

FIG. 10 illustrates an optical cross section of a zoom lens according to a numerical example 3 of the present invention.

FIGS. 11A through 11C are aberration charts of the zoom lens according to the numerical example 3 of the present invention.

FIG. 12 illustrates an optical cross section of a zoom lens according to a numerical example 4 of the present invention.

FIGS. 13A through 13C are aberration charts of the zoom lens according to the numerical example 4 of the present invention.

FIG. 14 illustrates an optical cross section of a zoom lens according to a numerical example 5 of the present invention.

FIGS. 15A through 15C are aberration charts of the zoom lens according to the numerical example 5 of the present invention.

FIG. 16 illustrates an optical cross section of a zoom lens according to a numerical example 6 of the present invention.

FIGS. 17A through 17C are aberration charts of the zoom lens according to the numerical example 6 of the present invention.

FIG. 18 illustrates an optical cross section of a zoom lens according to a numerical example 7 of the present invention.

FIGS. 19A through 19C are aberration charts of the zoom lens according to the numerical example 7 of the present invention.

FIGS. 20A through 20C illustrate dispersion characteristics of an indium-tin oxide (ITO).

FIG. 21 is a diagram illustrating components of an image pickup apparatus according to an exemplary embodiment of the present invention.

Claims

1. A zoom lens comprising: a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;an aperture stop; anda refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dt/dw>1.1.

2. The zoom lens according to claim 1, wherein the refractive optical element has a positive refractive power and is located in front of the aperture stop.

3. The zoom lens according to claim 1, wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.

4. The zoom lens according to claim 1, wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition: θgd−(−1.687×10−7·νd3+5.702×10−5·νd2−6.603×10−3·νd+1.500)>0.

5. The zoom lens according to claim 1, wherein the Abbe number (νd) of the solid material satisfies the following condition: νd<60.

6. The zoom lens according to claim 1, wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition: |dn/dT|<2.5×10−4(1/° C.).

7. A zoom lens comprising: a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;an aperture stop; anda refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.755)>0,wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dw/dt>1.1.

8. The zoom lens according to claim 7, wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.

9. The zoom lens according to claim 7, wherein the refractive optical element has a positive refractive power and is located behind the aperture stop.

10. The zoom lens according to claim 7, wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition: θgd−(−1.687×10−7·νd3+5.702×10−5·νd2−6.603×10−3·νd+1.500)>0.

11. The zoom lens according to claim 7, wherein the Abbe number (νd) of the solid material satisfies the following condition: νd<60.

12. The zoom lens according to claim 7, wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition: |dn/dT|<<2.5×10−4(1/° C.).

13. A zoom lens comprising: a lens unit having a negative refractive power;a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;an aperture stop; anda refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.700)<0,wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dt/dw>1.1.

14. The zoom lens according to claim 13, wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.

15. The zoom lens according to claim 13, wherein the refractive optical element has a positive refractive power and is located behind the aperture stop.

16. A zoom lens comprising: a lens unit having a negative refractive power;a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;an aperture stop; anda refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θgF−(−1.665×10−7·νd3+5.213×10−5·νd2−5.656×10−3·νd+0.700)<0,wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dw/dt>1.1.

17. The zoom lens according to claim 16, wherein the refractive optical element has a positive refractive power and is located in front of the aperture stop.

18. The zoom lens according to claim 16, wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.

19. The zoom lens according to claim 16, wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition: |dn/dT|<2.5×10−4(1/° C.).

20. The zoom lens according to claim 1, wherein the zoom lens is adapted to form an image on a photoelectric conversion element.

21. The zoom lens according to claim 7, wherein the zoom lens is adapted to form an image on a photoelectric conversion element.

22. The zoom lens according to claim 13, wherein the zoom lens is adapted to form an image on a photoelectric conversion element.

23. The zoom lens according to claim 16, wherein the zoom lens is adapted to form an image on a photoelectric conversion element.

24. An optical apparatus comprising: the zoom lens according to claim 1; anda photoelectric conversion element configured to receive an image formed by the zoom lens.

25. An optical apparatus comprising: the zoom lens according to claim 7; anda photoelectric conversion element configured to receive an image formed by the zoom lens.

26. An optical apparatus comprising: the zoom lens according to claim 13; anda photoelectric conversion element configured to receive an image formed by the zoom lens.

27. An optical apparatus comprising: the zoom lens according to claim 16; anda photoelectric conversion element configured to receive an image formed by the zoom lens.