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US3785259A
Expired / Lapsed
US
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Daylight and flash photography change-over electrically-operated shutter
Assignee: Seiko Koki KK
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Filing: 1972-12-21
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Granted: 1974-01-15
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Expires: 1992-12-21
Abstract
Abstract An electrically-operated shutter provided with a change-over device or arrangement for effecting daylight and flash photography automatically shifting from a daylight mode to a flash photography mode as a function of the detected brightness level of the field being photographed. One embodiment provides for manually presetting the camera for flash photography which is then automatically carried out with an automatic change-over from a daylight photography mode to a flash photography mode. When carrying out daylight photography the power source energy is used in control and in energizing an electromagnet that controls the exposure termination under control of a delay circuit. When taking flash exposure the delay circuit is not employed and a fixed exposure time is used. The power supply is then used to energize the flashbulb and the accuracy of the shutter timing is unaffected as might be the case if the power source were energizing both the flashbulb and driving or energizing the shutter. The same shutter-operating elements are used in both modes of operation and the change-over arrangement eliminates the use of the delay circuit when the brightness level is below a predetermined level so that flash photography becomes necessary.
Inventors
- 👤 K Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:23
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
In an electrically operated camera shutter, circuit means comprising an electromagnet having an armature for controlling closing of an electrically operated shutter upon de-energization thereof, shutter-operating mechanism for opening and closing said shutter having means comprising a delay circuit for closing said shutter under control of said electromagnet when variable exposure times are to be effected and means for closing the shutter at a fixed exposure time period for flash photography, change-over means in said circuit means for placing the electromagnet in circuit for timed exposures and out of circuit for fixed exposure times for flash photography.
Claim 2
Dependent Claim
97 words
In an electrically operated camera shutter, circuit means comprising an electromagnet having an armature for controlling closing of an electrically operated shutter upon de-energization thereof, shutter-operating mechanism for opening and closing said shutter having means comprising a delay circuit for closing said shutter under control of said electromagnet when variable exposure times are to be effected and means for closing the shutter at a fixed exposure time period for flash photography, change-over means in said circuit means for placing the electromagnet in circuit for timed exposures and out of circuit for fixed exposure times for flash photography.
Claim 3
Dependent Claim
122 words
In an electrically operated camera shutter, circuit means comprising means for variably controlling the length of exposure periods as a function of the brightness of a scene being photographed and when said brightness is above a given level, mechanical means for mechanically controlling the exposure period as a substantially fixed period of time when the brightness of said scene is below said level and flash photography must be effected, change-over means disposed in said circuit means and said mechanical means controlling as a function of said brightness the variable controlling of the exposure periods and the fixed exposure time period, and flash means under control of said change-over means for effecting flash photography when fixed exposures are established by said mechanical means.
Claim 4
Dependent Claim
122 words
In an electrically operated camera shutter, circuit means comprising means for variably controlling the length of exposure periods as a function of the brightness of a scene being photographed and when said brightness is above a given level, mechanical means for mechanically controlling the exposure period as a substantially fixed period of time when the brightness of said scene is below said level and flash photography must be effected, change-over means disposed in said circuit means and said mechanical means controlling as a function of said brightness the variable controlling of the exposure periods and the fixed exposure time period, and flash means under control of said change-over means for effecting flash photography when fixed exposures are established by said mechanical means.
Claim 5
Dependent Claim
134 words
In an electrically operated camera shutter, circuit means having light-responsive sensing means sensing in operation the brightness Of a scene being photographed and means including an electromagnet for variably controlling exposure time of a shutter when said brightness of said scene is above a given level and as a function of the brightness of said scene, mechanical means for controlling the exposure time when said brightness is below said level, change-over means coactive with said circuit means and said mechanical means for precluding energizing of said electromagnet when said brightness sensed is below said level thereby to control said exposure time solely mechanically and thereby have a fixed time period, and means energized in operation under control of said change-over means for energizing a flash device when said mechanical means controls said exposure time.
Claim 6
Dependent Claim
134 words
In an electrically operated camera shutter, circuit means having light-responsive sensing means sensing in operation the brightness Of a scene being photographed and means including an electromagnet for variably controlling exposure time of a shutter when said brightness of said scene is above a given level and as a function of the brightness of said scene, mechanical means for controlling the exposure time when said brightness is below said level, change-over means coactive with said circuit means and said mechanical means for precluding energizing of said electromagnet when said brightness sensed is below said level thereby to control said exposure time solely mechanically and thereby have a fixed time period, and means energized in operation under control of said change-over means for energizing a flash device when said mechanical means controls said exposure time.
Claim 7
Dependent Claim
45 words
In an electrically operated camera shutter according to claim 3, in which said circuit means comprises a power source, and in which said change-over means comprises means connecting said power source in series with the last-mentioned means when said brightness is below said brightness level.
Claim 8
Dependent Claim
116 words
In an electrically-operated camera shutter according to claim 3, in which said electromagnet comprises an armature and in which said mechanical means comprises a pressure-applying lever applying a force to said armature to bias it to a position to which it is attracted when said electromagnet is energized, a control lever connected to said armature, a timing lever coactive with said control lever for controlling the exposure time when said electromagnet is not energized, a shutter-operating member controlled by said timing member for closing of the shutter, and means disenabling said pressure-applying member when said brightness is below said level when a photographic exposure is taken, whereby the exposure time is controlled by said mechanical means.
Claim 9
Dependent Claim
26 words
In an electrically-operated camera shutter according to claim 3, in which said electromagnet comprises an armature enabling said mechanical means for controlling the exposure time mechanically.
Claim 10
Dependent Claim
17 words
In an electrically-operated camera shutter according to claim 3, including mechanical means for enabling said change-over means.
Claim 11
Dependent Claim
43 words
In an electrically-operated camera shutter according to claim 3, in which said circuit means comprises a delay circuit, and in which said change-over means comprises means disenabling the delay circuit and means enabling the mechanical means when said brightness is below said level.
References Cited (Backward Citations)
US3535989A
Cited
US3650193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |