Exposure control device for a camera

Details Exposure control device for a camera Exposure control device for a camera

1975-08-21

1977-07-19

Adams, Russell E.

354 50, 354 60A, G03B 708

Patent

active

040372332

ABSTRACT:
An exposure control device is disclosed which has an extremely high accuracy as compared with the prior art, the error range being within a one-eighth step. For such a highly accurate control of exposure time, a value of exposure time to be determined is converted to a binary code of n bits, of which the lowest one bit is weighed one-eighth step. Based on the decimal number corresponding to the upper m bits of the binary code, the frequency of the control signal is adjusted and is used in reading out the lower (n - m) bits of the same binary code, whereby the period of actuation of the shutter is determined.

REFERENCES:
patent: 3868704 (1975-02-01), Yamada et al.
patent: 3879118 (1975-04-01), Kiyohara et al.
patent: 3900855 (1975-08-01), Stempeck
patent: 3903528 (1975-09-01), Kee

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