Patent US4095243A successfully refreshed from Google Patents.
US4095243A
Expired / Lapsed
US
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Warning device for a camera
Assignee: Fujinon Corp
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Filing: 1976-03-15
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Granted: 1978-06-13
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Expires: 1996-03-15
Abstract
Abstract The warning device for a camera has an operation circuit for determining proper exposure condition of the shutter time according to the informations of the brightness of the object, the diaphragm aperture of the objective and the film sensitivity, a manually operable circuit for manually setting the condition of the shutter time and an optical indicating circuit operated by the manually operable circuit for digitally indicating the condition of the shutter time set by the manually operable circuit. The warning device comprises a coincidence detecting circuit with its inputs connected to the output of the operation circuit and the manually operable circuit, respectively, and with its output connected to one of the inputs of a gate circuit, and an oscillator with its output connected to the other input of the gate circuit, the output of the gate circuit being connected to the optical indicating circuit, thereby causing winking of the optical indication of the optical indicating circuit until the output of the manually operable circuit reaches that of the operation circuit.
Inventors
- 👤 Saburo Numata
- 👤 Shin-ichiro Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B7/00; G03B7/08; G03B7/091; G03B7/093
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
216 words
Warning device for a camera having an operation circuit for determining the proper exposure condition of exposure information such as the shutter time according to the informations of the brightness of the object, exposure information such as the diaphragm aperture of the objective and the film sensitivity, a manually operable circuit for manually setting the condition of the shutter time and an optical indicating circuit operated by the manually operable circuit for digitally indicating the condition of the shutter time set by said manually operable circuit, the improvement comprising: a coincidence detecting circuit with inputs connected to the output of the operation circuit and the manually operable circuit, respectively, a gate circuit, said coincidence detecting having an output connected to a first input of said gate circuit, and an oscillator with output connected to a second input of said gate circuit, the output of said gate circuit being connected to said optical indicating circuit, thereby causing blinking of the optical indication of said optical indicating circuit when the output of said manually operable circuit differs from that of said operation circuit, the optical indication of said optical indicating circuit being in a lighted state when the output of said manually operable circuit corresponding to the set shutter time coincides with the output of said operation circuit.
Claim 2
Dependent Claim
216 words
Warning device for a camera having an operation circuit for determining the proper exposure condition of exposure information such as the shutter time according to the informations of the brightness of the object, exposure information such as the diaphragm aperture of the objective and the film sensitivity, a manually operable circuit for manually setting the condition of the shutter time and an optical indicating circuit operated by the manually operable circuit for digitally indicating the condition of the shutter time set by said manually operable circuit, the improvement comprising: a coincidence detecting circuit with inputs connected to the output of the operation circuit and the manually operable circuit, respectively, a gate circuit, said coincidence detecting having an output connected to a first input of said gate circuit, and an oscillator with output connected to a second input of said gate circuit, the output of said gate circuit being connected to said optical indicating circuit, thereby causing blinking of the optical indication of said optical indicating circuit when the output of said manually operable circuit differs from that of said operation circuit, the optical indication of said optical indicating circuit being in a lighted state when the output of said manually operable circuit corresponding to the set shutter time coincides with the output of said operation circuit.
Claim 3
Dependent Claim
60 words
Device according to claim 1, wherein said optical indicating circuit comprises a decoder, a matrix circuit connected to said decoder, a photo diode driver circuit connected to said matrix circuit and a photo diode indicating assembly connected to said driver circuit, said decoder being connected to said manually operable circuit while said driver circuit is connected to said gate circuit.
Claim 4
Dependent Claim
78 words
A warning device for a camera as defined in claim 1 wherein said operation circuit includes light measuring means, said manually set shutter time being indicated by said indicating circuit so that said indicating circuits is in a lighted state at all times when the set shutter time coincides with the output of said light measuring means, said indicating circuit being in said blinking state when said shutter time differs from the output of said light measuring means.
References Cited (Backward Citations)
US3956758A
Cited
US3967288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |