US3870400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-angle lens system with movable lens for correcting short distance photographic faculty arranged near diaphragm
Assignee: Olympus Corp
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Filing: 1973-05-07
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Granted: 1975-03-11
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Expires: 1993-05-07
Abstract
Abstract A wide-angle lens system with a movable lens for correcting the short distance photographic faculty arranged near a diaphragm, which comprises a front lens group F and a rear lens group R separated by a diaphragm space, said rear group R comprising a movable lens in the form of a positive or negative singlet or a lens having a simple construction, said movable lens being arranged near the diaphragm and adapted to be moved in response to the change of its distance from an object toward the diaphragm when it is the positive lens and away from the diaphragm when it is the negative lens, and defined by the condition
Inventors
- 👤 Nobuo Yamashita
- 👤 Toru Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:54
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, wherein f 100 and 2 omega 63* and r1 to r18, d1 to d17 and n1 to n10 are defined by the following values, f 100, 2 omega 63*
Claim 2
Dependent Claim
111 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, wherein f 100 and 2 omega 63* and r1 to r18, d1 to d17 and n1 to n10 are defined by the following values, f 100, 2 omega 63*
Claim 3
Dependent Claim
111 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, wherein f 100 and 2 omega 102* and r1 to r24, d1 to d23 and n1 to n13 are defined by the following values, f 100, 2 omega 102*
Claim 4
Dependent Claim
111 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, wherein f 100 and 2 omega 102* and r1 to r24, d1 to d23 and n1 to n13 are defined by the following values, f 100, 2 omega 102*
Claim 5
Dependent Claim
177 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wideangle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, said movable lens being a positive lens adapted to be moved in response to the change of its distance from an object toward said diaphragm, and the conditions 0.6 < fm/f < 3.5 and fFB < 1.0 fF are satisfied where fm is the focal length of said movable lens, f is the overall focal length of the total lens system, fF is the focal length of the front lens group F followed by the movable lens and fFB is the back focal length of the front lens group F followed by the movable lens.
Claim 6
Dependent Claim
177 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wideangle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, said movable lens being a positive lens adapted to be moved in response to the change of its distance from an object toward said diaphragm, and the conditions 0.6 < fm/f < 3.5 and fFB < 1.0 fF are satisfied where fm is the focal length of said movable lens, f is the overall focal length of the total lens system, fF is the focal length of the front lens group F followed by the movable lens and fFB is the back focal length of the front lens group F followed by the movable lens.
Claim 7
Dependent Claim
177 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, said movable lens being a positive lens adapted to be moved in response to the change of its distance from an object toward said diaphragm, and the conditions 0.6 < fm/f < 3.5 and fFB < 1.0 fF are satisfied where fm is the focal length of said movable lens, f is the overall focal length of the total lens system, fF is the focal length of the front lens group F followed by the movable lens and fFB is the back focal length of the front lens group F followed by the movable lens.
Claim 8
Dependent Claim
177 words
A wide-angle lens system comprising a front lens group F and a rear lens group R separated by a diaphragm space, said wide-angle lens system effecting focussing by movement of the whole lens system, said rear lens group R including a movable lens arranged near said diaphragm and adapted for correcting the short distance photographic faculty, said movable lens consisting of a lens adapted to be moved along an optical axis when said whole lens system is focussed to the short distance, said movable lens being a positive lens adapted to be moved in response to the change of its distance from an object toward said diaphragm, and the conditions 0.6 < fm/f < 3.5 and fFB < 1.0 fF are satisfied where fm is the focal length of said movable lens, f is the overall focal length of the total lens system, fF is the focal length of the front lens group F followed by the movable lens and fFB is the back focal length of the front lens group F followed by the movable lens.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |