Camera electrical self-timer

Details Camera electrical self-timer Camera electrical self-timer

1978-12-21

1980-08-26

Hix, L. T.

354238, 354266, G03B 708, G03B 902

Patent

active

042192625

ABSTRACT:
A self-timer in a camera which has a shutter priority automatic exposure adjustment (EE) mode, a manual exposure adjustment mode or an aperture priority automatic exposure adjustment (ES) mode, or all three exposure adjustment modes. In the (EE) mode, light passing through a lens aperture is received by a light receiving element while the lens aperture is being stopped down. When an aperture value (the quantity of light) suitable for the preset shutter speed and film sensitivity is obtained the supply of current of an aperture control magnet having attracted an aperture locking lever is interrupted to lock the operation of the aperture thereby to determine an aperture value. Simultaneously the locking of a top curtain is released by the lever. The camera has an interlocking timer circuit in which, in modes other than the (EE) mode, the supply of current to the aperture control magnet is interrupted in a period of time such that a period of time required for stopping down the aperture to its minimum aperture value is made slightly longer, thereby to release the top curtain. A switch for changing the time constant of the interlocking timer circuit is provided to increase the operating time of the interlocking timer circuit.

REFERENCES:
patent: 3777637 (1973-12-01), Kuramoto et al.
patent: 4161354 (1979-07-01), Kurei

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