US4685786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control device for camera
Assignee: Nikon Corp
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Filing: 1986-03-31
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Granted: 1987-08-11
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Expires: 2006-03-31
Abstract
Abstract An exposure control device for a camera is so structured that the film information recorded on the film or the cartridge is read, the reflection coefficient of the loaded film is determined based on the read film information and the termination of light emission of an electronic flash device or the start of run of a shutter curtain is controlled in accordance with the reflection coefficient so that the proper exposure is always obtained by the light emission control or the shutter control by the TTL direct light detection irrespective of the change of the reflection coefficient of the film.
Inventors
- 👤 Yoshikazu Iida
- 👤 Kenji Ishizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:06
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
An exposure control device for a camera comprising: a photo-detector for detecting a light which passes through an imaging lens and is reflected by a film surface; control means for controlling exposure of the film in accordance with the output of said photo-detector; read means for reading information on a film latitude from the film or a cartridge in which the film is accommodated; and correction means for correcting the exposure controlled by said control means by determining a reflection coefficient of the film loaded in the camera based on the information of the latitude read by said read means.
Claim 2
Dependent Claim
100 words
An exposure control device for a camera comprising: a photo-detector for detecting a light which passes through an imaging lens and is reflected by a film surface; control means for controlling exposure of the film in accordance with the output of said photo-detector; read means for reading information on a film latitude from the film or a cartridge in which the film is accommodated; and correction means for correcting the exposure controlled by said control means by determining a reflection coefficient of the film loaded in the camera based on the information of the latitude read by said read means.
Claim 3
Dependent Claim
27 words
An exposure control device for a camera according to claim 1 wherein said control means controls the exposure by controlling light emission of an electronic flash device.
Claim 4
Dependent Claim
23 words
An exposure control device for a camera according to claim 2 wherein said control means controls the exposure by controlling a shutter speed.
Claim 5
Dependent Claim
64 words
An exposure control device for a camera according to claim 1 wherein said read means reads the information on a film sensitivity from the film or the film cartridge when the film is loaded to the camera, and said correction means controls the exposure controlled by said control means based on the information on the film sensitivity and the information on the film latitude.
Claim 6
Dependent Claim
97 words
An exposure control device for a camera comprising: a photo-detector for detecting a light which passes through an imaging lens and is reflected by a film surface; control means for controlling exposure to the film in accordance with a detection output of said photo-detector; read means for reading information of a film from the film or a cartridge in which the film is accommodated; and correction means for correcting the exposure controlled by said control means by determining a reflection coefficient of the film loaded in the camera based on the information read by said read means.
Claim 7
Dependent Claim
97 words
An exposure control device for a camera comprising: a photo-detector for detecting a light which passes through an imaging lens and is reflected by a film surface; control means for controlling exposure to the film in accordance with a detection output of said photo-detector; read means for reading information of a film from the film or a cartridge in which the film is accommodated; and correction means for correcting the exposure controlled by said control means by determining a reflection coefficient of the film loaded in the camera based on the information read by said read means.
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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |