Patent
1974-09-11
1976-10-19
Adams, Jr., Russell E.
354146, 354147, G03B 1503
Patent
active
039874680
ABSTRACT:
An apparatus for activating an electronic flash by operating an X contact when the first blind of a focal plane shutter has terminated its movement to fully open an exposure light path, irrespective of an exposure period establishing operation. Where an electronic focal plane shutter is combined with an auto-strobo, a photometric circuit within the electronic circuit is used to measure the radiation from the auto-strobo, and to control the amount of exposure to a proper value. Where a proper amount of exposure is available by natural light when the shutter is opened, a closing movement of the shutter is utilized to cause the trigger capacitor of the electronic flash to be discharged, thereby disabling the illumination of the electronic flash.
REFERENCES:
patent: 2643597 (1953-06-01), Suzukawa
patent: 2682815 (1954-07-01), Gasser
patent: 2930298 (1960-03-01), Suzukawa
patent: 3326103 (1967-06-01), Topaz
patent: 3502012 (1970-03-01), Takeuchi
Kondo Isao
Maitani Yoshihisa
Matsuzaki Soichiro
Shimoyama Kunio
Adams, Jr. Russell E.
Olympus Optical Co,. Ltd.
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