US4396263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure indicating device
Assignee: Minolta Co Ltd
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Filing: 1981-09-24
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Granted: 1983-08-02
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Expires: 2001-09-24
Abstract
Abstract An exposure indicating device indicates at the same time a result of average light measurement which measures a light level of a substantial portion of a scene to be photographed, and a result of spot light measurement which measures a brightness at a small portion of the scene. One of the values of the average and spot light measurements is displayed numerically to indicate its absolute value, while the other is displayed as a deviation from the former value.
Inventors
- 👤 Seiji Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:38
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
An exposure indication and control system for a photographic camera comprising: exposure signal means for generating an exposure control signal; exposure control means for controlling camera exposure in response to said exposure control signal; first indicator means for indicating, in response to said exposure control signal, the exposure value to be controlled by said exposure control means in numerical form; light detecting means for measuring the brightness of a small portion of a scene to be photographed and generating a light related signal as a function of the measured brightness; means for detecting the amount of the difference between said exposure control signal and said light related signal; and second indicator means for indicating the amount of the difference in a visual form wherein the distance of an indicated point from a reference point represents the amount of the difference.
Claim 2
Dependent Claim
140 words
An exposure indication and control system for a photographic camera comprising: exposure signal means for generating an exposure control signal; exposure control means for controlling camera exposure in response to said exposure control signal; first indicator means for indicating, in response to said exposure control signal, the exposure value to be controlled by said exposure control means in numerical form; light detecting means for measuring the brightness of a small portion of a scene to be photographed and generating a light related signal as a function of the measured brightness; means for detecting the amount of the difference between said exposure control signal and said light related signal; and second indicator means for indicating the amount of the difference in a visual form wherein the distance of an indicated point from a reference point represents the amount of the difference.
Claim 3
Dependent Claim
48 words
An exposure indication and control system as in claim 1 further comprising a manually operable member for generating a fixing signal in response to the manual operation, and means for fixing the indication by said second indicator means to a value indicated upon receipt of the fixing signal.
Claim 4
Dependent Claim
63 words
An exposure indication and control system as in claim 2, wherein said fixing means includes a plurality of storage means for respectively storing the data as a function of said light related signal, and means for producing a plurality of indications in accordance with the stored data, said data being stored in response to a plurality of manual operations made at different times.
Claim 5
Dependent Claim
42 words
An exposure indication and control system as in claim 1 wherein said second indicator means includes a plurality of dot indicator elements arranged in a row and means for energizing said elements in accordance with the output of said means for detecting.
Claim 6
Dependent Claim
32 words
An exposure indication and control system as in claim 4, wherein said first indicator means includes means for making a numerical indication at the central position of said row of indicator elements.
Claim 7
Dependent Claim
32 words
An exposure indication and control system as in claim 5 wherein said first indicator means includes means for indicating in numerical form a shutter speed as a function of the measured brightness.
Claim 8
Dependent Claim
31 words
An exposure indication and control system as in claim 7 wherein said exposure signal means includes means for generating the exposure control signal in accordance with a manually set exposure value.
Claim 9
Dependent Claim
45 words
An exposure indication and control system as in claim 1 further comprising means for indicating in the camera viewfinder field the portion of the scene at which the brightness is detected, said first and second indication means showing the indication in the camera viewfinder field.
Claim 10
Dependent Claim
72 words
An exposure indication and control system as in claim 1 wherein said second indicator means includes a plurality of dot indication elements arranged to be viewed in line on opposite sides of the indication by said first indicator means, and means for selectively actuating said dot indication elements such that the distance from the indication by said first indicator means to the actuated dot indicator element represents the amount of the difference.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |