US4187017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor drive device in a camera
Assignee: Nikon Corp
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Filing: 1978-11-02
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Granted: 1980-02-05
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Expires: 1998-11-02
Abstract
Abstract In a motor drive device capable of being coupled to a camera having an automatic exposure control circuit for determining the aperture value and/or the shutter speed during exposure in accordance with the brightness of an object to be photographed, there is provided a delay circuit adapted to start operating upon closing of a main switch for the automatic exposure control circuit and generate a stability signal after the lapse of the time required for the control circuit to become stable in condition after being supplied with power, and means for operating the control circuit upon reception of both the stability signal and a photography signal supplied from a second switch.
Inventors
- 👤 Sakuji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:34
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
In a motor drive device capable of being coupled to a camera having an automatic exposure control circuit for determining the aperture value and/or the shutter speed during exposure in accordance with the brightness of an object to be photographed and wherein upon depression of a shutter release button provided on said device, a main switch for said automatic exposure control circuit and a second switch for supplying a photography signal to a control circuit for operating a motor for driving said camera are closed, the improvement comprising: (a) delay circuit adapted to start operating upon closing of said main switch and generate a stability signal after the lapse of a predetermined time equal to the time equal to the time required for said automatic exposure control circuit to become stable in condition after being supplied with power; and (b) means for operating said control circuit upon reception of both said stability signal and said photography signal.
Claim 2
Dependent Claim
157 words
In a motor drive device capable of being coupled to a camera having an automatic exposure control circuit for determining the aperture value and/or the shutter speed during exposure in accordance with the brightness of an object to be photographed and wherein upon depression of a shutter release button provided on said device, a main switch for said automatic exposure control circuit and a second switch for supplying a photography signal to a control circuit for operating a motor for driving said camera are closed, the improvement comprising: (a) delay circuit adapted to start operating upon closing of said main switch and generate a stability signal after the lapse of a predetermined time equal to the time equal to the time required for said automatic exposure control circuit to become stable in condition after being supplied with power; and (b) means for operating said control circuit upon reception of both said stability signal and said photography signal.
Claim 3
Dependent Claim
45 words
A device according to claim 1, further comprising: means for closing said main switch in a first half of the depression of said shutter release button; and means for closing said second switch in a second half of the depression of said shutter release button.
Claim 4
Dependent Claim
49 words
A device according to claim 1, wherein said control circuit includes: an integrating circuit connected to one end of said main switch; a voltage dividing circuit connected to the other end of said main switch; and voltage comparing means connected to said integrating circuit and said voltage dividing circuit.
Claim 5
Dependent Claim
37 words
A device according to claim 3, wherein said voltage comparing means generates said stability signal when the voltage put out by said integrating circuit has become higher than the voltage put out by said voltage dividing circuit.
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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |