Zooming lens system and device using the zooming lens system
A zooming lens apparatus including a first optical lens group having a positive refractive power, a second optical lens group having a negative refractive power, a third optical lens group having a positive refractive power, and a fourth optical lens group having a positive refractive power. The zooming lens apparatus also includes an aperture diaphragm arranged between the second and third optical lens group. When a scaling of the zooming lens system is changed from a wide-angle limit to a telescopic limit, the first optical lens group and the third optical lens group are moved in a first direction, and the fourth optical lens group is moved in a second direction opposite of the first direction. The zooming lens apparatus satisfies an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
1. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group;
a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group; and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group in a first direction, and to move the fourth optical lens group in a second direction opposite to the first direction, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
2. The zooming lens apparatus according to claim 1 , wherein the zooming lens apparatus satisfies an inequality condition 1.0<m 4T /m 4W <1.3, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit, and m 4W represents an imaging magnification of the fourth optical lens group at the wide-angle limit.
3. The zooming lens apparatus according to claim 1 , wherein the zooming lens apparatus satisfies an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group in zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
4. The zooming lens apparatus according to claim 1 , wherein the zooming lens apparatus satisfies an inequality condition 0.25<X 3 /f T <0.50, where X 3 represents a total traveling distance of the third optical lens group in zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
5. The zooming lens apparatus according to claim 1 , wherein the zooming lens apparatus satisfies an inequality condition 0.6<|f 2 |/F 3 <1.0, wherein f 2 represents a focal length of the second optical lens group, and f 3 represents a focal length of the third optical lens group.
6. The zooming lens apparatus according to claim 1 , wherein the zooming lens apparatus satisfies an inequality condition 6.0<f 1 /f W <12.0, wherein f 1 represents a focal length of the first optical lens group G 1 , and f W represents a focal length of the entire zooming lens apparatus at the wide-angle limit.
7. The zooming lens apparatus according to claim 1 , wherein,
the frame assembly is configured such that the aperture diaphragm is movable independently of the second and third optical lens groups, and
a distance between the aperture diaphragm and the third optical lens group is at a maximum distance at the wide-angle limit and is at a minimum distance at the telescopic limit.
8. The zooming lens apparatus according to claim 1 , wherein the second optical lens groups includes,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face the aperture diaphragm,
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm, and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between the positive lens and the aperture diaphragm.
9. The zooming lens apparatus according to claim 8 , wherein the second optical lens group satisfies inequality conditions:
1.77<N 21 <1.90, 35<v 21 <50,
1.65<N 22 <1.90, 20<v 22 <35, and
1.75<N 23 <1.90, 35<v 23 <50,
where N 2i represents a refractive index of a lens at an i-th position i-th closest to a subject in the second optical lens group, and v 2i represents an Abbe number of a lens at an i-th position i-th closest to the subject in the second optical lens group.
10. The zooming lens apparatus according to claim 1 , wherein an opening size of the aperture diaphragm is constant during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
11. The zooming lens apparatus according to claim 1 , wherein an opening size of the aperture diaphragm increases during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
12. The zooming lens apparatus according to claim 1 , wherein the frame assembly is arranged as a cylindrical telescoping frame.
13. A camera, comprising:
an optical filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
a fourth optical lens group having a positive refractive power and arranged between the third optical lens group and the optical filter/cover, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group away from the optical filter/cover, and to move the fourth optical lens group toward the optical filter/cover, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
14. A mobile information device, comprising:
an optical filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
a fourth optical lens group having a positive refractive power and arranged between the third optical lens group and the optical filter/cover, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group away from the optical filter/cover, and to move the fourth optical lens group toward the optical filter/cover, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
15. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group;
a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group; and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group in a first direction, and to move the fourth optical lens group in a second direction opposite of the first direction, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group during zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
16. The zooming lens apparatus according to claim 15 , wherein,
the frame assembly is configured to move the aperture diaphragm independently of the second and third optical lens groups, and
a distance between the aperture diaphragm and the third optical lens group is at a maximum distance at the wide-angle limit, and is at a minimum distance at the telescopic limit.
17. The zooming lens apparatus according to claim 15 , wherein the second optical lens groups includes,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face the aperture diaphragm;
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm; and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between positive lens and the aperture diaphragm.
18. The zooming lens apparatus according to claim 15 , wherein the zooming lens apparatus satisfies inequality conditions:
1.75<N 21 <1.90, 35<v 21 <50,
1.65<N 22 <1.90, 20<v 22 <35, and
1.75<N 23 <1.90, 35<v 23 <50,
where N 2i represents a refractive index of a lens at an i-th position i-th closest to a subject in the second optical lens group, and v 2i represents an Abbe number of a lens at an i-th position i-th closest to the subject in the second optical lens group.
19. The zooming lens apparatus according to claim 15 , wherein an opening size of the aperture diaphragm is constant during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
20. The zooming lens apparatus according to claim 15 , wherein an opening size of the aperture diaphragm increases during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
21. The zooming lens apparatus according to claim 15 , wherein the frame assembly is arranged as a cylindrical telescoping frame.
22. A camera comprising:
an optical filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
a fourth optical lens group having a positive refractive power and arranged between the third optical lens group and the optical filter/cover, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group away from the optical filter/cover, and to move the fourth optical lens group toward the optical filter/cover, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group during zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
23. A mobile information device, comprising:
an optical, filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
a fourth optical lens group having a positive refractive power and arranged between the third optical lens group and the optical filter/cover, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group and the third optical lens group away from the optical filter/cover, and to move the fourth optical lens group toward the optical filter/cover, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group during zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
24. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group; and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group, the second optical lens group, and the third optical lens group such that a distance between the first optical lens group and the second optical lens group increases and a distance between the second optical lens group and the third optical lens group decreases when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit,
wherein the second optical lens group includes,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face the aperture diaphragm,
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm, and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between positive lens and the aperture diaphragm, and
wherein the zooming lens apparatus satisfies an inequality condition 0.70<Y′ max /f W <1.00, where Y′ max represents a maximum image height, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
25. The zooming lens apparatus according to claim 24 , wherein,
a first negative lens in the second optical lens group includes an aspheric surface facing the aperture diaphragm, and
the zooming lens apparatus satisfies an inequality condition 0.0010<(1−N 2I )×X 2I (H 0.8 )/Y′ max <0.0500, where N 2I represents a refractive index of a meniscus lens of the second optical lens group facing the first optical lens group, X 2I (H 0.8 ) represents an aspheric mount on 80% of maximum light effective height on a surface of the second optical lens group that is closest to the aperture diaphragm, and Y′ max represents a maximum image height.
26. The zooming lens apparatus according to claim 25 , wherein,
a second negative lens in the second optical lens group includes an aspheric surface facing away from the aperture diaphragm, and
the zooming lens apparatus satisfies an inequality condition −0.0500<{(N 2O −1)×X 2O (H 0.8 )+(1−N 2I )×X 2I (H 0.8 )}/Y′ max <0.1500, where N 2O represents a the meniscus lens, X 2O (H 0.8 ) represents an aspheric mount on 80% of maximum light effective height on a surface of the second optical lens group that is furthest from the aperture diaphragm, N 2I represents a refractive index of a meniscus lens of the second optical lens group facing the aperture diaphragm, X 2I (H 0.8 ) represents an aspheric mount on 80% of maximum light effective height on the surface of the second optical lens group that is closest to the aperture diaphragm, and Y′ max represents a maximum image height.
27. The zooming lens apparatus according to claim 24 , wherein the zooming lens apparatus satisfies inequality conditions:
1.75<N 21 <1.90, 35<v 21 <50,
1.65<N 22 <1.90, 20<v 22 <35, and
1.75<N 23 <1.90, 35<v 23 <50,
where N 2i represents a refractive index of a lens at an i-th position i-th closest to a subject in the second optical lens group, and v 2i represents an Abbe number of a lens at an i-th position i-th closest to the subject in the second optical lens group.
28. The zooming lens apparatus according to claim 24 , wherein the positive lens and the second negative lens in the second optical lens group are attached at a jointed surface.
29. The zooming lens apparatus according to claim 28 , wherein the zooming lens apparatus satisfies an inequality condition −3.5<R 2c /Y′ max <−1.0, where R 2c represents a curvature radius of the jointed surface, and Y′ max represents a maximum image height.
30. The zooming lens apparatus according to claim 24 , wherein,
the frame assembly is configured to move the first optical lens group away from the second optical lens group when a scaling of the zooming lens apparatus is changed from the wide-angle limit to the telescopic limit, and
the zooming lens apparatus satisfies an inequality condition 0.50<(D 12T −D 12W )/f T <0.85, where D 12T represents a distance between the first optical lens group and the second optical lens group at the telescopic limit, D 12W represents a distance between the first optical lens group and the second optical lens group at the wide-angle limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
31. The zooming lens apparatus according to claim 24 , wherein,
the frame assembly is configured to move the third optical lens group towards the second optical lens group when a scaling of the zooming lens apparatus is changed from the wide-angle limit to the telescopic limit, and
the zooming lens apparatus satisfies an inequality condition 0.25<(D 23W −D 23T )/f T <0.65, where D 23W represents a distance between the second optical lens group and the third optical lens group at the wide-angle limit, D 23T represents a distance between the second optical lens group and the third optical lens group at the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
32. The zooming lens apparatus according to claim 24 , wherein the zooming lens apparatus satisfies an inequality condition 0.5<|f 2 |/f 3 <0.65, where f 2 represents a focal length of the second optical lens group, and f 3 represents a focal length of the third optical lens group.
33. The zooming lens apparatus according to claim 24 , wherein the zooming lens apparatus satisfies an inequality condition 6.0<f 1 /f W <0.65, where f 1 represents a focal length of the first optical lens group, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
34. The zooming lens apparatus according to claim 24 , further comprising:
a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group,
wherein the frame assembly is configured to move at least the first optical lens group and the third optical lens group in a first direction such that a distance between the first optical lens group and the second optical lens group increases, and such that a distance between the second optical lens group and the third optical lens group decreases, when a scaling of the zooming lens apparatus is changed from the wide-angle limit to the telescopic limit.
35. The zooming lens apparatus according to claim 34 , wherein the frame assembly is configured to move the fourth optical lens group in a second direction opposite of the first direction when a scaling of the zooming lens apparatus is changed from the wide-angle limit to the telescopic limit.
36. The zooming lens apparatus according to claim 34 , wherein,
the frame assembly is configured to move the aperture diaphragm independently of the second and third optical lens groups, and
a distance between the aperture diaphragm and the third optical lens group is at a maximum distance at the wide-angle limit, and is at a minimum distance at the telescopic limit.
37. The zooming lens apparatus according to claim 24 , wherein an opening size of the aperture diaphragm is constant during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
38. The zooming lens apparatus according to claim 24 , wherein an opening size of the aperture diaphragm increases during the scaling change of the zooming lens apparatus from the wide-angle limit to the telescopic limit.
39. The zooming lens apparatus of claim 24 , wherein the frame assembly is configured as a cylindrical telescoping frame.
40. A camera comprising:
an optical filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
the second optical lens group including,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face the aperture diaphragm,
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm, and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between positive lens and the aperture diaphragm, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group, the second optical lens group, and the third optical lens group such that a distance between the first optical lens group and the second optical lens group increases and a distance between the second optical lens group and the third optical lens group decreases when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.70<Y′ max /f W <1.00, where Y′ max represents a maximum image height, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
41. A mobile information device, comprising:
an optical filter/cover; and
a zooming lens apparatus including,
a first optical lens group having a positive refractive power,
a second optical lens group having a negative refractive power and arranged between the first optical lens group and the optical filter/cover,
a third optical lens group having a positive refractive power and arranged between the second optical lens group and the optical filter/cover,
an aperture diaphragm arranged between the second optical lens group and the third optical lens group,
the second optical lens group including,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face the aperture diaphragm,
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm, and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between positive lens and the aperture diaphragm, and
a frame assembly configured to support the first optical lens group, the second optical lens group, the third optical lens group, and the aperture diaphragm, the frame assembly being configured to move the first optical lens group, the second optical lens group, and the third optical lens group such that a distance between the first optical lens group and the second optical lens group increases and a distance between the second optical lens group and the third optical lens group decreases when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.70<Y′ max /f W <1.00, where Y′ max represents a maximum image height, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
42. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group;
a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group; and
means for supporting the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, and for moving the first optical lens group and the third optical lens group in a first direction, and for moving the fourth optical lens group in a second direction opposite to the first direction, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
43. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group;
a fourth optical lens group having a positive refractive power, the third optical lens group being arranged between the aperture diaphragm and the fourth optical lens group; and
means for supporting the first optical lens group, the second optical lens group, the third optical lens group, the fourth optical lens group, and the aperture diaphragm, and for moving the first optical lens group and the third optical lens group in a first direction, and for moving the fourth optical lens group in a second direction opposite of the first direction, when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group during zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
44. A zooming lens apparatus, comprising:
a first optical lens group having a positive refractive power;
a second optical lens group having a negative refractive power;
an aperture diaphragm, the second optical lens group being arranged between the first optical lens group and the aperture diaphragm;
a third optical lens group having a positive refractive power, the aperture diaphragm being arranged between the second optical lens group and the third optical lens group; and
means for supporting the first optical lens group, the second optical lens group, the third optical lens group, and the aperture diaphragm, and for moving the first optical lens group, the second optical lens group, and the third optical lens group such that a distance between the first optical lens group and the second optical lens group increases and a distance between the second optical lens group and the third optical lens group decreases when a scaling of the zooming lens apparatus is changed from a wide-angle limit to a telescopic limit, and the zooming lens apparatus satisfying an inequality condition 0.70<Y′ max /f W <1.00, where Y′ max represents a maximum image height, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
45. A method of changing a scaling of a zooming lens apparatus from a wide-angle limit to a telescopic limit, comprising:
moving a first optical lens group of the zooming lens apparatus towards a subject, the first optical lens group having a positive refractive power;
preventing movement of a second optical lens group of the zooming lens apparatus, the second optical lens group having a negative refractive power and being arranged between the first optical lens group and an image plane;
moving a third optical lens group of the zooming lens apparatus towards the subject, the third optical lens group having a positive refractive power and being arranged between the second optical lens group and the image plane; and
moving a fourth optical lens group of the zooming lens apparatus away from the subject, the fourth optical lens group having a positive refractive power and being arranged between the third optical lens group and the image plane,
wherein the zooming lens apparatus satisfies an inequality condition 0.60<m 4T <0.85, where m 4T represents an imaging magnification of the fourth optical lens group at the telescopic limit.
46. The method of claim 45 , further comprising:
moving an aperture diaphragm of the zooming lens apparatus towards the subject, the aperture diaphragm being arranged between second optical lens group and the third optical lens group.
47. A method of changing a scaling of a zooming lens apparatus from a wide-angle limit to a telescopic limit, comprising:
moving a first optical lens group of the zooming lens apparatus towards a subject, the first optical lens group having a positive refractive power;
preventing movement of a second optical lens group of the zooming lens apparatus, the second optical lens group having a negative refractive power and being arranged between the first optical lens group and an image plane;
moving a third optical lens group of the zooming lens apparatus towards the subject, the third optical lens group having a positive refractive power and being arranged between the second optical lens group and the image plane; and
moving a fourth optical lens group of the zooming lens apparatus away from the subject, the fourth optical lens group having a positive refractive power and being arranged between the third optical lens group and the image plane,
wherein the zooming lens apparatus satisfies an inequality condition 0.50<X 1 /f T <0.85, where X 1 represents a total traveling distance of the first optical lens group during zooming from the wide-angle limit to the telescopic limit, and f T represents a focal length of the entire zooming lens apparatus at the telescopic limit.
48. The method of claim 47 , further comprising:
moving an aperture diaphragm of the zooming lens apparatus towards the subject, the aperture diaphragm being arranged between second optical lens group and the third optical lens group.
49. A method of changing a scaling of a zooming lens apparatus from a wide-angle limit to a telescopic limit, comprising:
moving a first optical lens group of the zooming lens apparatus towards a subject, the first optical lens group having a positive refractive power;
moving a second optical lens group of the zooming lens apparatus away from the subject, the second optical lens group having a negative refractive power and being arranged between the first optical lens group and an image plane, and the second optical lens group including,
a first negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the first negative lens, the optical surface being arranged to face an aperture diaphragm of the zooming lens apparatus,
a positive lens including an optical surface having a curvature larger than a curvature of another optical surface of the positive lens, the optical surface being arranged to face the aperture diaphragm, and the positive lens being arranged between the first negative lens and the aperture diaphragm, and
a second negative lens including an optical surface having a curvature larger than a curvature of another optical surface of the second negative lens, the optical surface being arranged to face the first optical lens group, and the second negative lens being arranged between positive lens and the aperture diaphragm;
moving the aperture diaphragm of the zooming lens apparatus towards the subject, the aperture diaphragm being arranged between second optical lens group and the image plane; and
moving a third optical lens group of the zooming lens apparatus towards the subject, the third optical lens group having a positive refractive power and being arranged between the aperture diaphragm and the image plane,
wherein the zooming lens apparatus satisfies an inequality condition 0.70<Y′ max /f W <1.00, where Y′ max represents a maximum image height, and f W represents an image magnification of the entire zooming lens apparatus at the wide-angle limit.
50. The method of claim 49 , further comprising:
moving a fourth optical lens group of the zooming lens apparatus away from the subject, the fourth optical lens group having a positive refractive power and being arranged between the third optical lens group and the image plane.