Exposure controlling device for camera

Details Exposure controlling device for camera Exposure controlling device for camera

1996-12-30

1998-08-04

Perkey, W. B.

Photography

Exposure control circuit

Look-up table memory

396242, G03B 7097

Patent

active

057909059

ABSTRACT:
The exposure controlling device comprises a controlling unit that controls, at the time of an exposure, the DC motor to rotate forward to open the shutter blades and then to rotate reversely to close the shutter blades, a calculating unit that calculates a time period for driving the DC motor in the forward direction between a predetermined starting point and a point where a required aperture area is obtained, a timer for counting the time period from the starting point, a memory for storing data of relationship between the time period and the aperture area, and means for storing an individual data of the relationship into the memory.
The calculating unit calculates the time period based on a required aperture area by using the data of relationship stored in the memory for compensating individual differences among lens shutters.

REFERENCES:
patent: 4396272 (1983-08-01), Shono et al.
patent: 4423934 (1984-01-01), Lambeth et al.
patent: 4514075 (1985-04-01), Negishi et al.
patent: 4697908 (1987-10-01), Ogihara et al.
patent: 5162831 (1992-11-01), Haraguchi et al.
patent: 5255049 (1993-10-01), Akimoto et al.

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