1980-11-14
1982-05-25
Adams, Russell E.
354152, 354224, 354225, G03B 700, G03B 1912
Patent
active
043314023
ABSTRACT:
A single-lens reflex camera comprises a movable mirror, a detection mirror, and a mechanism for driving both mirrors. The movable mirror has a light transmitting section mounted on a support plate to swing between a first position where the movable mirror leads light transmitted through a camera lens to a finder and a second position where the movable mirror allows the light to reach a shutter screen. The detection mirror is mounted on the movable mirror to swing between a first position where the detection mirror leads light transmitted through the light transmitting section to the detector for focusing and a second position where the detection mirror blocks up the light transmitting section. The mechanism includes a driving source for swinging the movable mirror between the first and second positions, a cam surface formed in the support plate, and a pin mounted on the detection mirror and capable of engaging the cam surface. The cam surface causes the pin to swing the detection mirror from the first position to the second position when the movable mirror is swung from the first position to the second position by the driving source, and from the second position to the first position when the movable mirror is swung from the second position to the first position.
REFERENCES:
patent: 3468233 (1969-09-01), Schmidt
patent: 4068246 (1978-01-01), Arai
Adams Russell E.
Olympus Optical Co,. Ltd.
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