US3854811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delay mechanism for a single lens reflex camera mirror drive
Assignee: Ricoh Co Ltd
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Filing: 1973-11-21
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Granted: 1974-12-17
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Expires: 1993-11-21
Abstract
Abstract A single lens reflex camera having an electrical shutter, which operates on the light transmitted through a taking lens, and a diaphragm operating member and a mirror drive member, which are cocked by the film winding operation and freed upon depression of a release button, and also including a delay unit to delay the operation of the diaphragm operating member or the mirror drive member so that measurement of the light transmitted through the taking lens is permitted following focussing and after the diaphragm aperture has been stabilized subsequent to the setting operation of the unit, the camera including a storage for the photometric value.
Inventors
- 👤 K Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:17
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
214 words
In a single-lens reflex camera having: a. an optical system with a focussing light path to a finder and a taking light path to the film; b. a diaphragm for setting the opening of said light paths; c. a photometry system for sensing incoming light on the focussing light path to said finder; d. a shutter for opening the taking light path to the film; e. a shutter release; f. a reflecting mirror disposed in said light paths for directing the incoming light to said focussing light path and said photometry system and movable to close said focussing light path and open said taking light path to the film upon the acutation of said shutter release; and g. a film winding mechanism; wherein the improvement comprises: h. diaphragm operating means for setting the opening of said diaphragm upon the actuation of said shutter release; i. mirror drive means operatively coupled to said diaphragm operating means for moving said mirror out of the taking light path in response to the setting of said diaphragm; j. delay means for delaying the operation of said mirror drive means until the setting of said diaphragm is stabilized; and k. switch means actuated at the termination of the operation of said delay means for instantaneously operating said photometry system.
Claim 2
Dependent Claim
214 words
In a single-lens reflex camera having: a. an optical system with a focussing light path to a finder and a taking light path to the film; b. a diaphragm for setting the opening of said light paths; c. a photometry system for sensing incoming light on the focussing light path to said finder; d. a shutter for opening the taking light path to the film; e. a shutter release; f. a reflecting mirror disposed in said light paths for directing the incoming light to said focussing light path and said photometry system and movable to close said focussing light path and open said taking light path to the film upon the acutation of said shutter release; and g. a film winding mechanism; wherein the improvement comprises: h. diaphragm operating means for setting the opening of said diaphragm upon the actuation of said shutter release; i. mirror drive means operatively coupled to said diaphragm operating means for moving said mirror out of the taking light path in response to the setting of said diaphragm; j. delay means for delaying the operation of said mirror drive means until the setting of said diaphragm is stabilized; and k. switch means actuated at the termination of the operation of said delay means for instantaneously operating said photometry system.
Claim 3
Dependent Claim
37 words
A camera as in claim 1 further comprising a setting lever interlocked with said film winding mechanism for movement thereby and a drive spring connecting said setting lever with said diaphragm operating means for the energizing thereof.
Claim 4
Dependent Claim
22 words
A camera as in claim 1 further comprising spring means for operatively coupling said mirror drive means to said diaphragm operating means.
Claim 5
Dependent Claim
85 words
A camera as in claim 1 wherein said delay means comprises an operator on said reflecting mirror and pin means integrally mounted on said mirror drive means for engaging and driving said operator and displaced from said operator before the actuation of said shutter release so as to delay the operation of said mirror drive means on said reflecting mirror until after the termination of any rebounding which might occur after thE diaphragm setting operation as a result of rapidly driving the diaphragm operating means.
Claim 6
Dependent Claim
28 words
A camera as in claim 1 wherein said delay means comprises an escape wheel operatively coupled to said mirror drive means and an anchor engaging said escape wheel.
Claim 7
Dependent Claim
49 words
A camera as in claim 5 further comprising a sector-shaped toothed wheel integrally mounted on the diaphragm operating means and coupled to said escape wheel for slowing down the operation of the diaphragm operating means so that the diaphragm blades will not rebound after the diaphragm aperture setting operation.
Claim 8
Dependent Claim
27 words
A camera as in claim 1 wherein said delay means comprises an electrical delay circuit including a CR-timer and a solenoid coupled to said mirror drive means.
Claim 9
Dependent Claim
27 words
A camera as in claim 7 further comprising a switching circuit in the delay circuit including a variable resistance for setting the delay time of said CR-timer.
Claim 10
Dependent Claim
32 words
A camera as in claim 1 wherein said delay means comprises a time constant circuit including a capacitor, a resistor, a switching transistor, and a solenoid coupled to the mirror drive means.
Claim 11
Dependent Claim
22 words
A camera as in claim 1 wherein said switch means is actuated in response to the operation of the diaphragm operating means.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |