US4302085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter time adjustment for a flash mode and/or film-leader location
Assignee: Nikon Corp
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Filing: 1980-02-15
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Granted: 1981-11-24
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Expires: 2000-02-15
Abstract
Abstract In a photographic camera comprising an exposure time control circuit for controlling the shutter speed in response to the brightness of the object and a film frame number indicating device capable of indicating a usable range for frames allowing photographing operation and a non-usable range for frames not allowing photographing operation, wherein the shutter being controlled to a shutter speed independent from the shutter speed determined by said exposure time control circuit when said indicating device indicates said non-usable range, an improvement comprises a second exposure time control circuit for controlling the shutter with a shutter speed suitable for flash photographing and switch means for selecting the shutter speed control by the aforementioned exposure time control circuit or by said second exposure time control circuit in response to the indication of said indicating device in such a manner that the shutter is controlled by the shutter speed determined by said second exposure time control circuit when said indicating device indicates said non-usable range.
Inventors
- 👤 Kazuyuki Kazami
- 👤 Yoshiaki Ohtsubo
- 👤 Yasunori Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
In a photographic camera comprising an exposure time control circuit for controlling the shutter speed in response to the brightness of the object, a film frame number indicating device capable of indicating an usable range for frames allowing photographing operation and a non-usable range for frames not allowing photographing operation, a second exposure time control circuit for controlling the shutter with a shutter speed suitable for flash photographing and means for controlling the shutter to a shutter speed independent from the shutter speed determined by said exposure time control circuit when said indicating device indicates said non-usable range, an improvement wherein said means for controlling the shutter comprise switch means for selecting the shutter speed control by the aforementioned exposure time control circuit or by said second exposure time control circuit in response to the indication of said indicating device in such a manner that the shutter is controlled by the shutter speed determined by said second exposure time control circuit when said indicating device indicates said non-usable range.
Claim 2
Dependent Claim
169 words
In a photographic camera comprising an exposure time control circuit for controlling the shutter speed in response to the brightness of the object, a film frame number indicating device capable of indicating an usable range for frames allowing photographing operation and a non-usable range for frames not allowing photographing operation, a second exposure time control circuit for controlling the shutter with a shutter speed suitable for flash photographing and means for controlling the shutter to a shutter speed independent from the shutter speed determined by said exposure time control circuit when said indicating device indicates said non-usable range, an improvement wherein said means for controlling the shutter comprise switch means for selecting the shutter speed control by the aforementioned exposure time control circuit or by said second exposure time control circuit in response to the indication of said indicating device in such a manner that the shutter is controlled by the shutter speed determined by said second exposure time control circuit when said indicating device indicates said non-usable range.
Claim 3
Dependent Claim
72 words
An improvement in the photographic camera according to the claim 1, further comprising: (a) connecting means for connecting a flash unit for said flash photographing; and (b) means for controlling said switch means in such a manner as to control the shutter by the shutter speed determined by said second exposure time control circuit in response to the connection of said flash unit even when said indicating device indicates said usable range.
Claim 4
Dependent Claim
87 words
An improvement in the photograhic camera according to the claim 1, further comprising: (a) connecting means for connecting a flash unit for said flash photographing; (b) means for detecting the charged voltage of said flash unit connected to the camera; and (c) means for controlling said switch means in such a manner as to control the shutter by the shutter speed determined by said second exposure time control circuit in response to the output from said detecting means even when said indicating device indicates said usable range.
Claim 5
Dependent Claim
108 words
An improvement in the photographic camera according to the claim 1, wherein said switch means comprising: (a) a first analog switch for controlling said exposure time control circuit; (b) a second analog switch for controlling said second exposure time control circuit; (c) actuating means for selectively closing either one of said first and second analog switches in response to an input voltage level supplied to said actuating means; (d) first voltage generating means; (e) second voltage generating means; and (f) a switch supplying the output signal either from said first or second voltage generating means to said actuating means in response to the indication of said indicating device.
Claim 6
Dependent Claim
52 words
An improvement in the photographic camera according to the claim 4, wherein said second voltage generating means comprising: (a) means for connecting a flash unit for said flash photographing; and (b) means for detecting the charged voltage of said connected flash unit and releasing an output signal corresponding to said charged voltage.
References Cited (Backward Citations)
US4096492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |