US3589259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperture control mechanism for photographic taking lens system
Assignee: Ricoh Co Ltd
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Filing: 1968-12-16
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Granted: 1971-06-29
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Expires: 1988-12-16
Abstract
Abstract An aperture control mechanism for a photographic taking lens system wherein a cam ring is provided with an automatic and manual aperture setting cam slots both of which are adjacent to and continuous with each other and which serve to control the range of angle of rotation of an aperture control lever for closing an aperture blade; and the cam ring is interlocked with an aperture setting ring, whereby automatic and manual aperture index scale regions can be disposed adjacent to each other upon the aperture setting ring.
Inventors
- 👤 Tadayuki Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
An aperture control mechanism for a photographic (photography) taking lens system characterized by comprising an aperture control lever rotatably pivoted to a pivot securely fixed to a lens barrel; an aperture control ring adapted to be actuated by the rotation of said aperture control lever so as to close an aperture blade; a cam ring provided with cam slots for regulating the range of the displacement of a pin secured to said aperture control lever; an intermediate lever adapted to engage with an arm of said aperture control lever so as to impart the rotation to said aperture control lever; and an actuator adapted to rotate said intermediate lever, said cam slots comprising automatic aperture setting cam slot and a manual aperture setting cam slot which is formed adjacent to and continuous with said automatic aperture setting slot, said cam ring being interlocked with an aperture setting ring.
Claim 2
Dependent Claim
148 words
An aperture control mechanism for a photographic (photography) taking lens system characterized by comprising an aperture control lever rotatably pivoted to a pivot securely fixed to a lens barrel; an aperture control ring adapted to be actuated by the rotation of said aperture control lever so as to close an aperture blade; a cam ring provided with cam slots for regulating the range of the displacement of a pin secured to said aperture control lever; an intermediate lever adapted to engage with an arm of said aperture control lever so as to impart the rotation to said aperture control lever; and an actuator adapted to rotate said intermediate lever, said cam slots comprising automatic aperture setting cam slot and a manual aperture setting cam slot which is formed adjacent to and continuous with said automatic aperture setting slot, said cam ring being interlocked with an aperture setting ring.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |