US3889282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens structure
Assignee: Canon Inc
•
Filing: 1973-06-14
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Granted: 1975-06-10
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Expires: 1993-06-14
Abstract
Abstract An interchangeable zoom lens has front and rear axially movable optical systems arranged to be moved in opposite directions to vary the focal length (zooming) and the front system is independently movable for focusing, by means of a distance ring projecting forward to provide a lens hood effect. The zooming control superimposes a displacement on the preset adjustment of the aperture by the aperture preset ring and also modifies the maximum open position of the aperture adjustment mechanism. In one embodiment, it also furnishes a correcting signal to the meter needle or matching pointer of the camera''s photometry system.
Inventors
- 👤 Shigeru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:17
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A zoom lens structure comprising: first and second optical systems; a first lens carrier for holding said first optical system; a second lens carrier for holding said second optical system, said second carrier including adjustable aperture means including an aperture setting ring and aperture preset means operable by said aperture setting ring; zoom operation means for moving said two optical systems relatively to each other to effect varifocal action; focusing means for moving one of said first and second optical systems independently of the other; aperture driving means for stopping down the adjustable aperture from a maximum open value to a preset value, set by said preset means through said aperture setting ring, and correcting means operable by said zoom operation means for superimposing a corrective displacement upon the adjustment of said aperture preset means effected by the position of said aperture setting ring.
Claim 2
Dependent Claim
144 words
A zoom lens structure comprising: first and second optical systems; a first lens carrier for holding said first optical system; a second lens carrier for holding said second optical system, said second carrier including adjustable aperture means including an aperture setting ring and aperture preset means operable by said aperture setting ring; zoom operation means for moving said two optical systems relatively to each other to effect varifocal action; focusing means for moving one of said first and second optical systems independently of the other; aperture driving means for stopping down the adjustable aperture from a maximum open value to a preset value, set by said preset means through said aperture setting ring, and correcting means operable by said zoom operation means for superimposing a corrective displacement upon the adjustment of said aperture preset means effected by the position of said aperture setting ring.
Claim 3
Dependent Claim
28 words
A zoom lens structure according to claim 1, wherein said aperture preset means includes a signal member providing the aperture value for an exposure meter in a camera.
Claim 4
Dependent Claim
26 words
A zoom lens structure according to claim 2, wherein said correcting means includes a second member providing the maximum open aperture value for the exposure meter.
Claim 5
Dependent Claim
28 words
A zoom lens structure according to claim 1, comprising also a member surrounding said first and second optical systems so disposed as to provide a lens hood effect.
Claim 6
Dependent Claim
26 words
A zoom lens structure according to claim 1, wherein said focusing means comprises a distance setting ring so disposed as to provide a lens hood effect.
Claim 7
Dependent Claim
25 words
A zoom lens structure according to claim 1, wherein said correcting means includes means for modifying said maximum open value of said adjustable aperture means.
Claim 8
Dependent Claim
31 words
A zoom lens structure as defined in claim 6, in which said correcting means includes also signal means for a camera body in which said zoom lens structure may be mounted.
Claim 9
Dependent Claim
26 words
A zoom lens structure according to claim 1, wherein said focusing means comprises means for moving said first optical system independently of said second optical system.
References Cited (Backward Citations)
US1950166A
Cited
US3106883A
Cited
US3221628A
Cited
US3351411A
Cited
US3370907A
Cited
US3541941A
Cited
US3591256A
Cited
US3590713A
Cited
US3683765A
Cited
US3714878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |