US3687047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interchangeable lens capable of change over between automatic and manual stop operations
Assignee: Canon Inc
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Filing: 1970-08-12
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Granted: 1972-08-29
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Expires: 1990-08-12
Abstract
Abstract An interchangeable lens capable of change over between automatic and manual diaphragm stop operations includes a diaphragm actuator ring and an automatic diaphragm interlocking member. Said actuator ring is normally urged in stop-down direction and engaged by said interlocking member which normally holds the actuator ring in a fully opened position with the aid of a spring being driven by a stop lever in a camera for automatic aperture stop operation. The interlocking member is displaceable to a position beyond its operating range and is clamped in that position for manual aperture stop operation, whereby the lens can be readily and simply changed over between automatic and manual stop operations.
Inventors
- 👤 Masaharu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
An interchangeable lens attachment for a camera which can be converted from manual to automatic-stop operation which comprises: a lens tube housing an objective lens and adapted to be attached to a camera; a diaphragm actuator ring positioned in said lens tube and normally biased in a stop-down direction; an automatic diaphragm interlocking member in said lens tube for engaging said diaphragm actuator ring biased to normally hold the latter in a fully opened position, said interlocking member being drivingly engageable with an automatic stop lever in said camera for automatic aperture stop operation and being displaceable to a position beyond its operation range to permit manual aperture stop operation; and clamping means mounted within said lens tube and arranged to engage and hold said interlocking member in its displaced position for manual aperture stop operation.
Claim 2
Dependent Claim
136 words
An interchangeable lens attachment for a camera which can be converted from manual to automatic-stop operation which comprises: a lens tube housing an objective lens and adapted to be attached to a camera; a diaphragm actuator ring positioned in said lens tube and normally biased in a stop-down direction; an automatic diaphragm interlocking member in said lens tube for engaging said diaphragm actuator ring biased to normally hold the latter in a fully opened position, said interlocking member being drivingly engageable with an automatic stop lever in said camera for automatic aperture stop operation and being displaceable to a position beyond its operation range to permit manual aperture stop operation; and clamping means mounted within said lens tube and arranged to engage and hold said interlocking member in its displaced position for manual aperture stop operation.
Claim 3
Dependent Claim
31 words
The device of claim 1 wherein said actuator ring and interlocking member are biased by means of springs with said interlocking member spring having greater force then said actuator ring spring.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |