Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1977-01-26
1982-12-14
Adams, Russell E.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340347M, 354289, G03B 708
Patent
active
043635407
ABSTRACT:
A storage device for storing photographic exposure information employs a closed-loop analog-to-digital (A-D) converter circuit includes a counter and a digital-to-analog (D-A) converter. The influence of erroneous signals which are created at the output of the D-A converter when the exposure information is stored in the counter is eliminated. The D-A converter circuit employs a ladder network of coarse accuracy. The stored exposure value, however, is highly accurate because of the closed-loop nature of the A-D converter circuit. Means responsive to the stored value for operating the exposure system of the camera are disclosed.
REFERENCES:
patent: 3703130 (1972-11-01), Watanabe
patent: 3995284 (1976-11-01), Kitauva et al.
patent: 4054887 (1977-10-01), Holle et al.
patent: 4132985 (1979-01-01), Kitauva
patent: 4137541 (1979-01-01), Mashimo et al.
Aizawa Hiroshi
Andresen Bernhard H.
Kwan Stephen C.
Martin Robert C.
Mashimo Yukio
Adams Russell E.
Canon Kabushiki Kaisha
Texas Instruments Incorporated
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