Patent US4092652A successfully refreshed from Google Patents.
US4092652A
Expired / Lapsed
US
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Exposure information indicating device for a camera
Assignee: Canon Inc
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Filing: 1977-08-26
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Granted: 1978-05-30
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Expires: 1997-08-26
Abstract
Abstract The analog signal corresponding to the brightness of the object to be photographed is converted into a digital signal by means of an A-D converter while a shutter control means adjust the shutter mechanism in accordance with the digital signal stored in the A-D converter whereby at the same time, a digital information indicating circuit indicates digitally the digital signal stored in the A-D converter. Hereby, the digital information indicating circuit is connected with the timing pulse forming circuit in such a manner that the indication circuit repeats the indication by means of the timing pulse forming circuit with a period allowing the photographer to visually recognize the digital information of the indicating circuit.
Inventors
- 👤 Tadashi Ito
- 👤 Fumio Ito
- 👤 Yukio Mashimo
- 👤 Nobuaki Sakurado
- 👤 Nobuhiko Shinoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:15
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/091; G03B7/093; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
A camera, comprising: (a) a light sensitive means for receiving an incident light from an object to be photographed and generating an analog signal corresponding to the amount of incident light received; (b) an analog-to-digital converter coupled to the light sensitive means for converting the analog signal into digital form, wherein said analog-to-digital converter repeats analog to digital conversion with a prescribed period; (c) an exposure control circuit for controlling the exposure value in response to the digital output signal from said analog-to-digital converter in digital form; (d) a timing pulse generator for producing time pulses having a period longer than the prescribed period; (e) a latching register; (f) a pulse-controlled gate means connected between the output of said light sensitive means and the input of said latching register for transferring a periodically renewed signal corresponding to the digital output signal from the analog-to-digital converter in digital form to said latching register in response to the time pulses; and (g) a digital information indicating means connected to the latching register for indicating an exposure value corresponding to the periodically renewed signal latched within the latching register in response to the timing pulses.
Claim 2
Dependent Claim
192 words
A camera, comprising: (a) a light sensitive means for receiving an incident light from an object to be photographed and generating an analog signal corresponding to the amount of incident light received; (b) an analog-to-digital converter coupled to the light sensitive means for converting the analog signal into digital form, wherein said analog-to-digital converter repeats analog to digital conversion with a prescribed period; (c) an exposure control circuit for controlling the exposure value in response to the digital output signal from said analog-to-digital converter in digital form; (d) a timing pulse generator for producing time pulses having a period longer than the prescribed period; (e) a latching register; (f) a pulse-controlled gate means connected between the output of said light sensitive means and the input of said latching register for transferring a periodically renewed signal corresponding to the digital output signal from the analog-to-digital converter in digital form to said latching register in response to the time pulses; and (g) a digital information indicating means connected to the latching register for indicating an exposure value corresponding to the periodically renewed signal latched within the latching register in response to the timing pulses.
Claim 3
Dependent Claim
27 words
A camera according to claim 1, wherein said timing pulse generator is energizable in response to completion of the analog to digital conversion in the analog-to-digital converter.
Claim 4
Dependent Claim
24 words
A camera according to claim 1, wherein said pulse-controlled gate means includes a plurality of AND circuits energizable in response to the timing pulses.
Claim 5
Dependent Claim
23 words
A camera according to claim 1, wherein said timing pulse generator includes an adjusting means for varying the period of the timing pulses.
Claim 6
Dependent Claim
25 words
A camera according to claim 3, wherein said latching register includes a plurality of flip-flops having inputs connected to respective outputs of said AND circuits.
References Cited (Backward Citations)
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |