Patent US4159168A successfully refreshed from Google Patents.
US4159168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure correction factor setting device for a camera
Assignee: Canon Inc
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Filing: 1977-11-29
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Granted: 1979-06-26
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Expires: 1997-11-29
Abstract
Abstract An exposure correction factor setting device is disclosed which includes an exposure correction factor setting dial, a brush connected to the dial and arranged to be operated when the film speed is manually adjusted, and a bias device connected to a variable resistor for manual adjustment of the film speed so as to apply to a film speed signal producing device for automatic adjustment of film speed a bias signal corresponding to the exposure correction factor set by the dial. It is thereby possible to utilize the exposure correction factor setting device in automatically setting a film speed by a film cassette as well as in manually setting the film speed.
Inventors
- 👤 Akiyasu Sumi
- 👤 Tokuichi Tsunekawa
- 👤 Shohei Ohtaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:43
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/003; G03B7/08; G03B7/091; G03B7/097
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
An exposure correction factor setting device for a camera utilizing film and having a first film speed signal producing means for producing a first signal in accordance with a film speed set automatically in response to indicia on said film, and including a second film speed signal producing means for producing a second signal in accordance with a film speed set manually, and an exposure correction factor adjusting means for adjusting the output signal of said second film speed signal producing means in response to a manually selected exposure correction factor, the improvment comprising: bias means connected between said first and second film speed signal producing means for supplying to said first film speed signal producing means a bias signal corresponding to a signal which is produced on said second film speed signal producing means by adjustment of said exposure correction factor adjusting means when said film with said indicia is inserted into the camera.
Claim 2
Dependent Claim
155 words
An exposure correction factor setting device for a camera utilizing film and having a first film speed signal producing means for producing a first signal in accordance with a film speed set automatically in response to indicia on said film, and including a second film speed signal producing means for producing a second signal in accordance with a film speed set manually, and an exposure correction factor adjusting means for adjusting the output signal of said second film speed signal producing means in response to a manually selected exposure correction factor, the improvment comprising: bias means connected between said first and second film speed signal producing means for supplying to said first film speed signal producing means a bias signal corresponding to a signal which is produced on said second film speed signal producing means by adjustment of said exposure correction factor adjusting means when said film with said indicia is inserted into the camera.
Claim 3
Dependent Claim
42 words
An exposure correction factor setting device according to claim 1, wherein said adjusting means and said bias means are arranged to move on said second film speed signal producing means while maintaining a constant separation therebetween when the film speed is adjusted.
Claim 4
Dependent Claim
29 words
An exposure correction factor setting device according to claim 2, wherein said adjusting means and said bias means are associated with a film speed dial mounted on the camera.
Claim 5
Dependent Claim
56 words
An exposure correction factor setting device according to claim 1, wherein said second film speed signal producing means includes: (a) a resistor; and (b) film speed adjusting means associated with the film speed dial for varying the resistance value of said resistor in response to the value of film speed set by the film speed dial.
Claim 6
Dependent Claim
28 words
An exposure correction factor setting device according to claim 4, wherein said film speed adjusting means and said exposure correction factor adjusting means slide on the same resistor.
Claim 7
Dependent Claim
33 words
An exposure correction factor setting device according to claim 5, wherein said film speed adjusting means includes a brush contacting with said resistor in order to vary the resistance value of said resistor.
Claim 8
Dependent Claim
30 words
An exposure correction factor setting device according to claim 4, wherein said exposure correction factor adjusting means includes a brush associated with an exposure correction factor dial of the camera.
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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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |