Patent US4235547A successfully refreshed from Google Patents.
US4235547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera
Assignee: West Electric Co Ltd
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Filing: 1979-07-05
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Granted: 1980-11-25
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Expires: 1999-07-05
Abstract
Abstract A photographic camera provided with a distance and brightness indicator wherein necessity of an artificial light source can be detected by brightness of a photographic object in a focusing adjustment and a photographic distance is indicated by illumination.
Inventors
- 👤 Hiroshi Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:06
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A distance and brightness indicator for a photographic camera comprising: a plurality of contact points corresponding to a distance of a photographic object, an indication means comprising several light emitting devices connected to said contact points, a brightness check circuit comprising a power supply source for said light emitting devices. a photo detector for detection of brightness of said photographic object, and a switching circuit for a control of voltage supplying of said power supply source with respect to said brightness of said photographic object, whereby said light emitting devices are connected to said power supply source through said brightness check circuit and corresponding one of said contact points.
Claim 2
Dependent Claim
109 words
A distance and brightness indicator for a photographic camera comprising: a plurality of contact points corresponding to a distance of a photographic object, an indication means comprising several light emitting devices connected to said contact points, a brightness check circuit comprising a power supply source for said light emitting devices. a photo detector for detection of brightness of said photographic object, and a switching circuit for a control of voltage supplying of said power supply source with respect to said brightness of said photographic object, whereby said light emitting devices are connected to said power supply source through said brightness check circuit and corresponding one of said contact points.
Claim 3
Dependent Claim
31 words
A distance and brightness indicator for a photographic camera of claim 1, wherein said brightness check circuit further comprises a timer circuit for controlling an operational time of said switching circuit.
Claim 4
Dependent Claim
39 words
A distance and brightness indicator for a photographic camera of claim 1, wherein said brightness check circuit further comprises a switch which is interlocked with a shutter knob and is closed at a slight press of said shutter knob.
References Cited (Backward Citations)
US3947862A
Cited
US4147420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |