Patent
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
Furukawa Masamichi
Takahashi Akira
Adams, Jr. Russell E.
Ricoh Co. Ltd.
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