Memory device of an electrical shutter for single lens reflex ca

Details Memory device of an electrical shutter for single lens reflex ca Memory device of an electrical shutter for single lens reflex ca

1975-07-07

1977-03-29

Adams, Jr., Russell E.

354 60A, 354 60L, G03B 700, G03B 708, G03B 1720

Patent

active

040152740

ABSTRACT:
A memory device is provided for storing a photometric quantity that is sensed and photoelectrically converted, by a light receiving element disposed in the light path of the finder of a single lens reflex camera, and used for determining a shutter speed or exposure time, which device includes an analogue-digital converter for conversion of the photometric quantity into a digital quantity, and which converter includes a digital-analogue converter having a plurality of storage elements which correspond in number to one more than the number of manually settable change-over steps of the shutter speed.

REFERENCES:
patent: 3703130 (1972-11-01), Watanabe
patent: 3807879 (1974-04-01), Mori
patent: 3824608 (1974-07-01), Toyoda
patent: 3828253 (1974-08-01), Mori
patent: 3843249 (1974-10-01), Kitaura
patent: 3895875 (1975-07-01), Kitaura et al.
patent: 3899788 (1975-08-01), Toyoda

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