Exposure time control device for a through the lens type single

Details Exposure time control device for a through the lens type single Exposure time control device for a through the lens type single

1975-09-04

1976-08-24

Adams, Jr., Russell E.

354 31, 354 51, G03B 708

Patent

active

RE0289426

ABSTRACT:
First and second output voltages are generated respectively in accordance with the logarithm of the intensity of light and as a function of a manually set exposure condition. A control signal to initiate shutter closing is generated when a signal which changes in proportion to the logarithm of an elapsed time period initiated by shutter release operation plus the second output voltage is substantially equal to the first output voltage. The control device includes a circuit for comparing the voltages. The device may be modified to generate a third output voltage which changes in response to the change of the signal and then comparing the first output voltage with the second plus the third output voltage.

REFERENCES:
patent: 3324779 (1967-06-01), Nobusawa et al.
patent: 3490835 (1970-01-01), Nemeth et al.
patent: 3641890 (1972-02-01), Ono
patent: 3670637 (1972-06-01), Mori et al.
patent: 3731603 (1973-05-01), Ono et al.
patent: 3752045 (1973-08-01), Ono et al.

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