Exposure control device for a camera

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

1979-04-04

1981-05-12

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92DM, 235 92T, 235 92CC, G06M 302, H03K 2136

Patent

active

042674379

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: 3581066 (1971-05-01), Maure et al.
patent: 3594551 (1971-07-01), Shearer et al.
patent: 3764790 (1973-10-01), Long et al.
patent: 3937932 (1976-02-01), Ahlgren

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