发明名称 |
Exposure information storage device for a photographic camera |
摘要 |
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.
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申请公布号 |
US4363540(A) |
申请公布日期 |
1982.12.14 |
申请号 |
US19770762514 |
申请日期 |
1977.01.26 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
TAKISHIMA, YOSHIYUKI;MASHIMO, YUKIO;UCHIDOI, MASANORI;AIZAWA, HIROSHI;ANDRESEN, BERNHARD H.;MARTIN, ROBERT C.;KWAN, STEPHEN C. |
分类号 |
G03B7/091;G03B7/093;H03M1/46;(IPC1-7):G03B7/08 |
主分类号 |
G03B7/091 |
代理机构 |
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地址 |
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