Shutter time control circuit

Details Shutter time control circuit Shutter time control circuit

1982-07-26

1984-07-31

Perkey, William B.

G03B 7093

Patent

active

044626738

ABSTRACT:
The disclosed shutter control circuit presents a shutter time as an analog value and converts the same into a digital value by an A/D converter, then nullifies information below a prescribed step of shutter time out of thus digitally converted value for effecting shutter time control based on a digital value which is above said prescribed step. In such a type of shutter time control circuit, even when an analog value as a preset value contains a certain error, the shutter time control can be done with said error being corrected and thus it is very convenient. In this case, however, an error in a positive direction only can be corrected, and an error in a negative direction can not be corrected. The present invention has been completed in view of the above and is to provide a shutter time control circuit which can correct the above mentioned analog value or A/D converted digital value by a prescribed amount so that errors in both the positive direction and the negative direction can be corrected in the above mentioned type of shutter time control circuit.

REFERENCES:
patent: 4034383 (1977-07-01), Mashjmo et al.
patent: 4125846 (1978-11-01), Nakamoto et al.

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