Patent US5134700A successfully refreshed from Google Patents.
Patent US3766839A successfully refreshed from Google Patents.
US3766839A
Expired / Lapsed
US
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Shutter operating mechanism
Assignee: Fujinon Corp
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Filing: 1970-10-06
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Granted: 1973-10-23
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Expires: 1990-10-06
Abstract
Abstract A single lens reflex camera having a shutter timing circuit and a trigger switch therein which operates in response to the operation of a member for actuating a reflex mirror positioned within the light path.
Inventors
- 👤 M Furusawa
- 👤 S Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:38
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A shutter operating mechanism in a single lens reflex camera comprising a shutter release member, automatic diaphragm control means in operative relationship with said shutter release member and normally held in a full-open position but closed to a predetermined aperture value in response to the operation of said shutter release member, a mirror in operative relationship with said shutter release member and normally held in a position to reflect light from an objective lens towards a finder but which is moved off the light path through said objective lens in response to the operation of said shutter release member, a member in operative relationship with said shutter release member to operate a first curtain of a shutter in response to the operation of said shutter release member and a member operatively associated with said shutter release member to operate a second curtain of the shutter, said shutter operating mechanism including timing circuit means having a trigger switch in mechanical relationship with said mirror to be operated in response to the movement of said mirror and in operative relationship for controlling operation of said second curtain operating member.
Claim 2
Dependent Claim
187 words
A shutter operating mechanism in a single lens reflex camera comprising a shutter release member, automatic diaphragm control means in operative relationship with said shutter release member and normally held in a full-open position but closed to a predetermined aperture value in response to the operation of said shutter release member, a mirror in operative relationship with said shutter release member and normally held in a position to reflect light from an objective lens towards a finder but which is moved off the light path through said objective lens in response to the operation of said shutter release member, a member in operative relationship with said shutter release member to operate a first curtain of a shutter in response to the operation of said shutter release member and a member operatively associated with said shutter release member to operate a second curtain of the shutter, said shutter operating mechanism including timing circuit means having a trigger switch in mechanical relationship with said mirror to be operated in response to the movement of said mirror and in operative relationship for controlling operation of said second curtain operating member.
Claim 3
Dependent Claim
71 words
A shutter operating mechanism as defined in claim 1, further including a single pivot lever in operative relationship with said mirror and with said first curtain operating member to enable said mirror and said first curtain operating member to be concurrently operated by said single pivot lever and wherein the trigger switch of said timing circuit is in operative relationship with said single pivot lever to be operated by said lever.
Claim 4
Dependent Claim
117 words
A shutter operating mechanism as defined in claim 2, further including two sliding plates and a spring biasing said plates towards each other, said plates being in operative relationship with said shutter and with said shutter release member such that in winding the shutter the first sliding plate is moved in one direction by a predetermined distance, with the second sliding member being latched, whereas in releasing the shutter said second sliding plate is released and moved in said oNe direction under the biasing force of said spring, whereby the automatic diaphragm control means is operated to a predetermined aperture value in response to the movement of said second sliding plate and concurrently said lever is moved.
Claim 5
Dependent Claim
90 words
A shutter operating mechanism as defined in claim 3, further including a pivotable second lever coaxially positioned with respect to said first lever and a second spring extending between said two levers, said second lever being in operative relationship to be rotated by the movement of said second sliding plate and said first lever being held against rotation in the initial stage of rotation of said second lever but being released when energy has been accumulated in said second spring and rotated by the accumulated energy of said second spring.
Claim 6
Dependent Claim
62 words
A shutter operating mechanism as defined in claim 1, further including a spring-biased hook member in operative relationship with said second curtain operating member for latching said second curtain operating member, an electromagnet having an armature, said hook member being positioned to be disengaged from the second curtain operating member by movement of said armature at the end of the shutter time.
References Cited (Backward Citations)
US3081680A
Cited
US3304848A
Cited
US3450017A
Cited
US3498195A
Cited
US3581633A
Cited
US3580154A
Cited
US3581642A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |