US3972591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Greatly variable magnification zoom lens system of large aperture ratio
Assignee: Canon Inc
•
Filing: 1974-09-16
•
Granted: 1976-08-03
•
Expires: 1994-09-16
Abstract
Abstract Attention has been directed to the fact that in zoom objective lens systems, the compensator for compensating the focal point shift caused by the zoom movement of the variator has generally two solution curves. A novel zooming mechanism such that the compensator is transferred from one to the other solution curve in the middle position of the zooming is employed in a zoom lens system to which this invention relates. As a result, this permits the variator and compensator to partake equally the function on magnification variation to enable minimizing the image shift sensitivity of each movable lens group and making the diameter of the front lens element small, and moreover compensating the variation of aberrations to very good degree.
Inventors
- 👤 Michiharu Suwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:26
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/16; G02B15/163; G02B15/167; G02B15/173; G02B15/144; G02B15/1441; G02B15/144105; G02B15/144113
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
230 words
A greatly variable magnification zoom lens of large aperture ratio comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system satisfying the conditions that the equivalent focal lengths and magnification powers of the lens groups, designated as fi, mi (i = 1 - 4) respectively, are defined by 0.24f.sub.i > f.sub.2 < 0.25f.sub.1 0.57f.sub.1 < f.sub.3 < 0.59f.sub.1 and when the equivalent focal length of the entire optical system varies from the minimum to the maximum with continuous variation in magnification, m 2 and m 1 not only increase in simple fashion, but coincide with each other at unity magnification (or m 2 = m 1 = -1) within the zooming region, whereby the relationship between the distance through which lens group II is displaced from the minimum equivalent focal length position to the coincidence position and the total distance through which lens group II is displaced from the minimum to maximum equivalent focal length position, designated as V m2 = 1 and V max respectively, is established that in the ratio of V m2 = 1 /V max , designated as α α= 0.8 2.
Claim 2
Dependent Claim
230 words
A greatly variable magnification zoom lens of large aperture ratio comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system satisfying the conditions that the equivalent focal lengths and magnification powers of the lens groups, designated as fi, mi (i = 1 - 4) respectively, are defined by 0.24f.sub.i > f.sub.2 < 0.25f.sub.1 0.57f.sub.1 < f.sub.3 < 0.59f.sub.1 and when the equivalent focal length of the entire optical system varies from the minimum to the maximum with continuous variation in magnification, m 2 and m 1 not only increase in simple fashion, but coincide with each other at unity magnification (or m 2 = m 1 = -1) within the zooming region, whereby the relationship between the distance through which lens group II is displaced from the minimum equivalent focal length position to the coincidence position and the total distance through which lens group II is displaced from the minimum to maximum equivalent focal length position, designated as V m2 = 1 and V max respectively, is established that in the ratio of V m2 = 1 /V max , designated as α α= 0.8 2.
Claim 3
Dependent Claim
225 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data: f = 7.238 - 68.79 F/1.4
Zoom Ratio: 9.504
Image Angle: 54.2° - 5.8°
ri di ni vi
______________________________________
191.7 1.7 1.80518 25.4
58.365 0.366
62.232 8.5 1.64000 60.2
-168.79 0.2
43.4021 6.5 1.64000 60.2
207.42 (d.sub.6)
267.23 1.0 1.71300 54.0
18.235 5.3
-29.654 0.7 1.69680 55.7
18.9525 4.5 1.80518 25.4
125.35 (d.sub.11)
5852.3 1.19 1.80518 25.4
43.22 6.98 1.6400 60.2
-37.9 0.2
38.2234 3.71 1.65160 58.6
224.952 (d.sub.16)
-60.061 0.7 1.65160 58.6
21.63 2.3 1.80518 25.4
50.002 2.35
0. 11.0 1.63854 55.4
0. 6.06
21.63 3.37 1.76200 40.2
63.98 2.62
12.0776 3.07 1.71300 54.0
29.918 1.83 2.80518 25.4
8.5258 6.07
-13.987 1.0 1.80518 25.4
57.565 3.96 1.67790 55.3
-19.74 0.41
117.089 2.03 1.66446 35.8
-32.11 0.1
21.7328 2.13 1.58144 40.7
-132.36 1.2
0. 6.8 1.63854 55.4
0.
f = 7.238 f = 15.72 f = 68.79
d.sub.6 1.000 14.826 28.652
d.sub.11
68.654 47.639 12.561
d.sub.16
2.006 9.195 30.446
______________________________________
f.sub.1 = 61.153
f.sub.2 = -15.120
f.sub.3 = 35.716
α = 0.8.
Claim 4
Dependent Claim
225 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data: f = 7.238 - 68.79 F/1.4
Zoom Ratio: 9.504
Image Angle: 54.2° - 5.8°
ri di ni vi
______________________________________
191.7 1.7 1.80518 25.4
58.365 0.366
62.232 8.5 1.64000 60.2
-168.79 0.2
43.4021 6.5 1.64000 60.2
207.42 (d.sub.6)
267.23 1.0 1.71300 54.0
18.235 5.3
-29.654 0.7 1.69680 55.7
18.9525 4.5 1.80518 25.4
125.35 (d.sub.11)
5852.3 1.19 1.80518 25.4
43.22 6.98 1.6400 60.2
-37.9 0.2
38.2234 3.71 1.65160 58.6
224.952 (d.sub.16)
-60.061 0.7 1.65160 58.6
21.63 2.3 1.80518 25.4
50.002 2.35
0. 11.0 1.63854 55.4
0. 6.06
21.63 3.37 1.76200 40.2
63.98 2.62
12.0776 3.07 1.71300 54.0
29.918 1.83 2.80518 25.4
8.5258 6.07
-13.987 1.0 1.80518 25.4
57.565 3.96 1.67790 55.3
-19.74 0.41
117.089 2.03 1.66446 35.8
-32.11 0.1
21.7328 2.13 1.58144 40.7
-132.36 1.2
0. 6.8 1.63854 55.4
0.
f = 7.238 f = 15.72 f = 68.79
d.sub.6 1.000 14.826 28.652
d.sub.11
68.654 47.639 12.561
d.sub.16
2.006 9.195 30.446
______________________________________
f.sub.1 = 61.153
f.sub.2 = -15.120
f.sub.3 = 35.716
α = 0.8.
Claim 5
Dependent Claim
193 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________113.17 1.7 1.80518 25.449.111 8.7 1.64000 60.2-314.35 0.246.653 6.0 1.64000 60.2184.659 (d 5 )226.12 1.0 1.71300 54.018.956 5.2-32.642 0.7 1.69680 55.718.272 3.5 1.80518 25.476.2925 (d 10 )-155.74 2.56 1.80518 25.458.649 0.2867.677 7.78 1.64000 60.2-33.25 0.235.292 4.17 1.65160 58.6264.487 (d 16 )-58.196 0.7 1.65160 58.620.822 2.3 1.80518 25.451.8332 2.350. 11.0 1.63854 55.40. 5.522.253 3.73 1.74400 44.859.119 1.911.689 3.71 1.71300 54.033.562 1.84 1.80518 25.48.2621 5.41-13.651 0.99 1.78470 26.250.924 3.67 1.67790 53.3-18.928 0.19118.55 1.84 1.66446 35.8-32.295 0.0820.755 2.08 1.58921 41.1-276.285 1.260. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 5 1.135 14.961 28.787d 10 66.848 45.835 10.742d 16 2.033 9.220 30.487______________________________________ f 1 = 62.640 f 2 = -15.119 f 3 = 35.714 α = 0.8.
Claim 6
Dependent Claim
193 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________113.17 1.7 1.80518 25.449.111 8.7 1.64000 60.2-314.35 0.246.653 6.0 1.64000 60.2184.659 (d 5 )226.12 1.0 1.71300 54.018.956 5.2-32.642 0.7 1.69680 55.718.272 3.5 1.80518 25.476.2925 (d 10 )-155.74 2.56 1.80518 25.458.649 0.2867.677 7.78 1.64000 60.2-33.25 0.235.292 4.17 1.65160 58.6264.487 (d 16 )-58.196 0.7 1.65160 58.620.822 2.3 1.80518 25.451.8332 2.350. 11.0 1.63854 55.40. 5.522.253 3.73 1.74400 44.859.119 1.911.689 3.71 1.71300 54.033.562 1.84 1.80518 25.48.2621 5.41-13.651 0.99 1.78470 26.250.924 3.67 1.67790 53.3-18.928 0.19118.55 1.84 1.66446 35.8-32.295 0.0820.755 2.08 1.58921 41.1-276.285 1.260. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 5 1.135 14.961 28.787d 10 66.848 45.835 10.742d 16 2.033 9.220 30.487______________________________________ f 1 = 62.640 f 2 = -15.119 f 3 = 35.714 α = 0.8.
Claim 7
Dependent Claim
200 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________168.29 1.7 1.80518 25.454.169 0.7855.638 9.0 1.64000 60.2-169.83 0.243.387 6.0 1.64000 60.2164.541 (d 6 )414.98 1.0 1.71300 54.018.635 5.2-31.727 0.7 1.69680 55.719.199 3.5 1.80518 25.4102.561 (d 11 )200.58 1.5 1.80518 25.442.381 0.9949.967 6.5 1.64000 60.2-38.752 0.236.555 3.0 1.65160 58.6108.907 (d 17 )-73.881 0.7 1.65160 58.622.26 2.3 1.80518 25.4-81.113 0.7 1.65160 58.622.079 2.3 1.80518 25.442.8213 2.350. 11.0 1.63854 55.40. 5.521.7 3.15 1.75700 47.965.65 0.111.5 3.88 1.71300 54.036.0 1.59 1.80518 25.48.13 6.29-13.8 1.72 1.78470 26.249.46 3.9 1.67790 53.3-18.66 1.76137.39 2.36 1.66446 35.8-31.92 0.121.42 1.8 1.59270 35.61049.52 1.20. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 8 1.339 15.165 28.991d 13 69.980 48.967 13.874d 19 2.056 9.243 30.510______________________________________ f 1 = 61.140 f 2 = 15.119 f 3 = 35.714 α = 0.8.
Claim 8
Dependent Claim
200 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens groups II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________168.29 1.7 1.80518 25.454.169 0.7855.638 9.0 1.64000 60.2-169.83 0.243.387 6.0 1.64000 60.2164.541 (d 6 )414.98 1.0 1.71300 54.018.635 5.2-31.727 0.7 1.69680 55.719.199 3.5 1.80518 25.4102.561 (d 11 )200.58 1.5 1.80518 25.442.381 0.9949.967 6.5 1.64000 60.2-38.752 0.236.555 3.0 1.65160 58.6108.907 (d 17 )-73.881 0.7 1.65160 58.622.26 2.3 1.80518 25.4-81.113 0.7 1.65160 58.622.079 2.3 1.80518 25.442.8213 2.350. 11.0 1.63854 55.40. 5.521.7 3.15 1.75700 47.965.65 0.111.5 3.88 1.71300 54.036.0 1.59 1.80518 25.48.13 6.29-13.8 1.72 1.78470 26.249.46 3.9 1.67790 53.3-18.66 1.76137.39 2.36 1.66446 35.8-31.92 0.121.42 1.8 1.59270 35.61049.52 1.20. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 8 1.339 15.165 28.991d 13 69.980 48.967 13.874d 19 2.056 9.243 30.510______________________________________ f 1 = 61.140 f 2 = 15.119 f 3 = 35.714 α = 0.8.
Claim 9
Dependent Claim
192 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens group II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________-452.18 1.7 1.80518 25.491.642 1.1395.327 6.5 1.71300 54.0-169.32 0.2182.65 4.0 1.60311 60.7-23035 0.240.571 5.2 1.60311 6.0793.8515 (d 8 )101.06 0.7 1.71300 54.020.514 5.5-31.549 0.7 1.69680 55.718.838 3.5 1.80518 25.450.9964 (d 13 )130.16 1.0 1.80518 25.448.981 1.3457.122 6.0 1.64000 60.2-40.845 0.238.987 2.5 1.65160 58.6109.837 (d 19 )44.8785 2.350. 11.0 1.63854 55.40. 6.021.144 2.45 1.76200 40.271.845 1.411.782 3.62 1.71300 54.032.121 1.42 1.80518 25.48.3216 6.18-13.972 1.0 1.78470 26.253.881 4.66 1.67790 53.3-18.843 0.5133.88 1.84 1.66446 35.8-31.226 0.122.425 1.89 1.58900 48.6315.807 1.20. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 6 1.179 15.005 28.831d 11 68.564 47.551 12.458d 17 2.121 9.308 30.575______________________________________ f 1 = 61.140 f 2 = -15.119 f 3 = 35.714 α = 0.8.
Claim 10
Dependent Claim
192 words
A zoom lens system comprising lens group I of positive power, lens group II of negative power, lens group III of positive power and lens group IV arranged successively on the common optical axis whereby lens group II and III are movable relative to lens group I to effect a continuous variation of magnification, said zoom lens system having the following constitutional data:f = 7.239 - 68.83 F/1.4Zoom Ratio: 9.508Image Angle: 54.2° - 5.8°ri di ni vi______________________________________-452.18 1.7 1.80518 25.491.642 1.1395.327 6.5 1.71300 54.0-169.32 0.2182.65 4.0 1.60311 60.7-23035 0.240.571 5.2 1.60311 6.0793.8515 (d 8 )101.06 0.7 1.71300 54.020.514 5.5-31.549 0.7 1.69680 55.718.838 3.5 1.80518 25.450.9964 (d 13 )130.16 1.0 1.80518 25.448.981 1.3457.122 6.0 1.64000 60.2-40.845 0.238.987 2.5 1.65160 58.6109.837 (d 19 )44.8785 2.350. 11.0 1.63854 55.40. 6.021.144 2.45 1.76200 40.271.845 1.411.782 3.62 1.71300 54.032.121 1.42 1.80518 25.48.3216 6.18-13.972 1.0 1.78470 26.253.881 4.66 1.67790 53.3-18.843 0.5133.88 1.84 1.66446 35.8-31.226 0.122.425 1.89 1.58900 48.6315.807 1.20. 6.8 1.63854 55.40. f = 7.239 f = 15.72 f = 68.83d 6 1.179 15.005 28.831d 11 68.564 47.551 12.458d 17 2.121 9.308 30.575______________________________________ f 1 = 61.140 f 2 = -15.119 f 3 = 35.714 α = 0.8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |