Patent
1978-04-12
1980-03-11
Gonzales, John
G03B 1912
Patent
active
041925980
ABSTRACT:
A mirror driving device for use in a single lens reflex camera comprises a driving lever pivotally mounted to the body of the camera, a mirror pin movable integrally with the mirror, and biasing means provided on the driving lever. The mirror pin is surrounded by a bent portion provided at one end of the driving lever and two springs of the biasing means. One of the two springs has relatively strong biasing force and engages the bent portion, while the other spring has relatively weak biasing force and always biases the mirror pin in such a direction that the mirror may descend. Upon forwarding motion of the driving lever the mirror pin is moved by the end of said lever, thereby raising the mirror. Upon returning motion of said lever the mirror pin is moved by the two springs, thereby lowering the mirror. When the lever is in its original position the mirror is pressed in a viewing-focusing position solely with the biasing force of the other spring.
REFERENCES:
patent: 3891992 (1975-06-01), Ueda et al.
Araki Yoshitaka
Sato Akihiko
Gonzales John
Nippon Kogaku K.K.
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