US4038675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for indicating the operation of a self-timer in an electric shutter for camera
Assignee: Seiko Koki KK
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Filing: 1975-03-14
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Granted: 1977-07-26
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Expires: 1995-03-14
Abstract
Abstract An electric camera shutter of the type having a digital recording and reproducing system has a self-timer mode and has a counter circuit for counting and memorizing pulses produced by a pulse generator. In one mode of operation, the exposure time is controlled in accordance with the memorized content of the counter circuit and when in the self-timer mode, the output of the counter circuit controls the energization of a self-timer operation indicator circuit which indicates operation in the self-timer mode.
Inventors
- 👤 Kiyoshi Kitai
- 👤 Takeo Saito
- 👤 Youichi Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:34
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A system for indicating the operation of a self-timer in an electric camera shutter of the type having a digital recording and reproducing system operable in a self-timer mode for counting and memorizing in a counter circuit a number of pulses produced from a pulse generator circuit, said number of pulses corresponding to the brightness of a subject to be photographed: means for controlling the exposure time in response to the triggering of a camera shutter release member according to the memorized content of said counter circuit and for controlling, in the case of using a self-timer, the operative period of the self-timer by frequency dividing the pulse output of said pulse generator through said counter circuit; and a self-timer operation indicator circuit controlled at the time of using the self-timer by the frequency division pulse output of said counter circuit for indicating operation in the self-timer mode.
Claim 2
Independent Claim
148 words
A system for indicating the operation of a self-timer in an electric camera shutter of the type having a digital recording and reproducing system operable in a self-timer mode for counting and memorizing in a counter circuit a number of pulses produced from a pulse generator circuit, said number of pulses corresponding to the brightness of a subject to be photographed: means for controlling the exposure time in response to the triggering of a camera shutter release member according to the memorized content of said counter circuit and for controlling, in the case of using a self-timer, the operative period of the self-timer by frequency dividing the pulse output of said pulse generator through said counter circuit; and a self-timer operation indicator circuit controlled at the time of using the self-timer by the frequency division pulse output of said counter circuit for indicating operation in the self-timer mode.
Claim 3
Dependent Claim
111 words
In an electric camera shutter of the self-timer type having a self-timer mode of operation and including a pulse generator circuit for generating pulses at a standard rate; and means including a reversible counter for counting and memorizing pulses from said pulse generator circuit corresponding in number to the brightness of a subject to be photographed: means for selectively controlling the exposure time in accordance with the memorized content of said reversible counter; means for selectively controlling the exposure time in accordance with a predetermined self-timer period; and means responsive to the output of said reversible counter for indicating when said electric camera shutter is in the self-timer mode of operation.
Claim 4
Dependent Claim
111 words
In an electric camera shutter of the self-timer type having a self-timer mode of operation and including a pulse generator circuit for generating pulses at a standard rate; and means including a reversible counter for counting and memorizing pulses from said pulse generator circuit corresponding in number to the brightness of a subject to be photographed: means for selectively controlling the exposure time in accordance with the memorized content of said reversible counter; means for selectively controlling the exposure time in accordance with a predetermined self-timer period; and means responsive to the output of said reversible counter for indicating when said electric camera shutter is in the self-timer mode of operation.
Claim 5
Dependent Claim
28 words
An electric camera shutter according to claim 2; further including means separate from said means for indicating the self-timer mode of operation for indicating the camera shutter speed.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |