US3688663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter device
Assignee: Canon Inc
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Filing: 1970-11-30
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Granted: 1972-09-05
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Expires: 1990-11-30
Abstract
Abstract A shutter device with a synchronizer contact which comprises a shifting member which shifts from its standard position with a constant shutter opening rate, and a blade for determining a blade opening in correspondence to the amount of the shifting movement; said synchronizer contact being closed by the shifting member at the time when the blade opening reaches a value determined for an appropriate artificial exposure.
Inventors
- 👤 Takashi Uchiyama
- 👤 Tadashi Ito
- 👤 Mutsuhide Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/70
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
A shutter apparatus for synchronization with a flash, comprising a shutter member movable across a path of light for variably blocking the quantity of light traveling along a path, shifting means coupled to said shutter member and movable along a predetermined path for movement from a starting position toward one of a plurality of positions at each of which the member blocks a different amount of light, speed control retarding means engaging said shifting means for controlling the speed of movement of said shifting means and thereby said shutter member, setting means for setting flash lighting conditions, closeable circuit means for triggering the flash when closed, contact means forming a part of said circuit means and movable by said setting means to a plurality of positions depending upon the flash lighting conditions, and contact actuating means mounted on said shifting means and movable with said shifting means to engage said contact means for closing the circuit means, said contact actuating means and said contact means forming flash synchronizing means.
Claim 2
Dependent Claim
169 words
A shutter apparatus for synchronization with a flash, comprising a shutter member movable across a path of light for variably blocking the quantity of light traveling along a path, shifting means coupled to said shutter member and movable along a predetermined path for movement from a starting position toward one of a plurality of positions at each of which the member blocks a different amount of light, speed control retarding means engaging said shifting means for controlling the speed of movement of said shifting means and thereby said shutter member, setting means for setting flash lighting conditions, closeable circuit means for triggering the flash when closed, contact means forming a part of said circuit means and movable by said setting means to a plurality of positions depending upon the flash lighting conditions, and contact actuating means mounted on said shifting means and movable with said shifting means to engage said contact means for closing the circuit means, said contact actuating means and said contact means forming flash synchronizing means.
Claim 3
Dependent Claim
36 words
An apparatus as in claim 1, wherein said shutter means includes a blade and wherein said shifting means includes a rotatable shifting member coupled to the blade and moving the blade while said shifting member rotates.
Claim 4
Dependent Claim
24 words
An apparatus as in claim 1, wherein said contact means forms a first contact element and said contact actuating means a second contact element.
Claim 5
Dependent Claim
36 words
An apparatus as in claim 3, wherein said shutter means comprises a blade and wherein said shifting means includes a rotatable shifting member coupled to the blade and moving said blade while said shifting means rotates.
Claim 6
Dependent Claim
58 words
An apparatus as in claim 1, wherein said retarding means includes stopping means for stopping and reversing the movement of said shifting means, said stopping means including a lock member engageable with said shifting means and a drive mechanism releasable at a predetermined time to contact said lock member for driving said shifting means in the reverse direction.
Claim 7
Dependent Claim
46 words
An apparatus as in claim 1, wherein said retarding means includes stopping means coupled to said setting means for stopping the movement of said shifting means at a predetermined position and driving said shifting means back to its starting position in response to said setting means.
Claim 8
Dependent Claim
32 words
An apparatus as in claim 1, wherein said contact means is movable by said setting means out of the path of said actuating means so as to avoid closing said circuit means.
Claim 9
Dependent Claim
82 words
An apparatus as in claim 1, further comprising electric eye means, stopping means forming a portion of said retarding means and responsive to said setting means for stopping and returning said shifting means to its starting position in response to said electric eye means, said setting meaNs being capable of connecting said electric eye means to cause said stopping means to respond thereto and being capable of moving said contact means out of the path of engagement with said contact actuating means.
Claim 10
Dependent Claim
30 words
Apparatus as in claim 1, wherein said contact means is elastically mounted so that said contact actuating means can contact said contact means and then pass over said contact means.
Claim 11
Dependent Claim
61 words
An apparatus as in claim 1, further comprising indicating means movable by said shifting means to a position corresponding to the position toward which said shifting means moves, said indicating means including friction means for retaining said indicating means in the position to which it has been moved by said shifting means when said shifting means returns to its starting position.
Claim 12
Dependent Claim
32 words
An apparatus as in claim 4, wherein said contact means is movable by said setting means out of the path of said actuating means so as to avoid closing said circuit means.
Claim 13
Dependent Claim
82 words
An apparatus as in claim 4, further comprising electric eye means, stopping means forming a portion of said retarding means and responsive to said setting means for stopping and returning said shifting means to its starting position in response to said electric eye means, said setting means being capable of connecting said electric eye means to cause said stopping means to respond thereto and being capable of moving said contact means out of the path of engagement with said contact actuating means.
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |