US3645185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure time control device
Assignee: Individual
•
Filing: 1969-10-03
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Granted: 1972-02-29
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Expires: 1989-10-03
Abstract
Abstract Different exposure times of a shutter-operating mechanism are obtained by variably coupling an inertia flywheel to the driving wheel for the shutter opening and closing to retard the driving wheel and by impeding the rotation of the flywheel by an electromagnetic abutment lever under control of a timing circuit to obtain longer exposure times.
Inventors
- 👤 Kiyoshi Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:50
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58; G03B9/62; G03B9/64
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
In a shutter-operating mechanism, means for opening and closing the shutter, driving means for actuating said shutteropening-and-closing means, means for releasing said driving means to initiate its running to open and close the shutter, means for variable mechanically retarding said driving means when the shutter is open including an inertia member driven by said driving means, electrically operable means for thereafter impeding said inertia member, a timing circuit controlling said impeding means, and exposure time selecting means including means for varying the mechanical retarding of said driving means by said mechanical retarding means to provide a first range of shorter exposure times and circuit means for varying the time of operation of said electrically operable impeding means under control of said timing circuit to provide a second range of longer exposure times.
Claim 2
Dependent Claim
132 words
In a shutter-operating mechanism, means for opening and closing the shutter, driving means for actuating said shutteropening-and-closing means, means for releasing said driving means to initiate its running to open and close the shutter, means for variable mechanically retarding said driving means when the shutter is open including an inertia member driven by said driving means, electrically operable means for thereafter impeding said inertia member, a timing circuit controlling said impeding means, and exposure time selecting means including means for varying the mechanical retarding of said driving means by said mechanical retarding means to provide a first range of shorter exposure times and circuit means for varying the time of operation of said electrically operable impeding means under control of said timing circuit to provide a second range of longer exposure times.
Claim 3
Dependent Claim
25 words
Shutter-operating mechanism according to claim 1, in which said timing circuit contains switch means controlled by releasing means and by said exposure time selecting means.
Claim 4
Dependent Claim
75 words
Shutter-operating mechanism according to claim 1, in which said circuit includes a timing switch operable by said shutter opening and closing means to initiate a timing operation of said circuit, and in which said retarding means retards the operation of said driving means a selected interval to afford time for said impeding means to operate. Shutter-operating mechanism according to claim 1, in which said inertia member comprises a flywheel rotationally driven by said driving means.
Claim 5
Dependent Claim
23 words
Shutter-operating mechanism according to claim 4, in which said impeding means is engageable with an abutment on said flywheel to impede its rotation.
Claim 6
Dependent Claim
27 words
Shutter-operating mechanism according to claim 5, in which said impeding means comprises an electromagnetically actuated lever having a cam surface engageable by said abutment on said flywheel.
Claim 7
Dependent Claim
16 words
Shutter-operating mechanism according to claim 4, in which said driving means comprises a rotary driving member.
Claim 8
Dependent Claim
36 words
Shutter-operating mechanism according to claim 7, comprising a pivoted lever engageable by an abutment on said driving wheel to swing said lever about its pivot and engaging a pin on said flywheel to rotate said flywheel.
Claim 9
Dependent Claim
40 words
Shutter-operating mechanism according to claim 8, in which said exposure time-selecting means includes means selectively varying the engagement of said lever by said abutment on said driving wheel to vary the retarding of said driving wheel by said retarding means.
Claim 10
Dependent Claim
46 words
Shutter-operating mechanism according to claim 4, in which said impeding means includes an electromagnetically operated lever engageable by an abutment on said flywheel, and in which said exposure time-selecting means comprises cam means for moving said lever out of the path of movement of said abutment.
Claim 11
Dependent Claim
57 words
Shutter-operating mechanism according to claim 1, in which said timing circuit comprises a switch and variable resistance, and in which said exposure time-selecting means comprises means controlling operation of said switch, means for varying said resistance, means for varying the retarding action of said retarding means on said driving means, and means for incapacitating said impeding 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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |