Mirror operating mechanism in single-lens reflex camera

Details Mirror operating mechanism in single-lens reflex camera Mirror operating mechanism in single-lens reflex camera

1981-09-10

1982-08-03

Griffin, Donald A.

354 55, G03B 1912

Patent

active

043425089

ABSTRACT:
In a single lens reflex camera of the type using a half-mirror and a total reflection mirror, a mirror operating mechanism is provided for automatically rotating the total reflection mirror against the light transmitting portion of the half-mirror as the half-mirror is raised to its photographing position. The second mirror holding frame is pivotably mounted to the first mirror holding frame and a second mirror operating lever pivotably mounted to the first mirror holding frame is coupled at one end to the second mirror holding frame. The other end of the second mirror operating lever abuts a fixed rotation angle limiting member as the first mirror holding frame is raised, thereby causing relative rotation of the second mirror operating lever with respect to the first mirror holding frame. The rotation angle limiting means is preferably a flexible member which will yield when the second mirror holding frame has rotated to its limit but the first mirror holding frame continues to rise. In the fully raised position, the total reflection mirror and the second mirror operating lever will together cover the light transmitting portion of the half-mirror.

REFERENCES:
patent: 3332331 (1967-07-01), Mandler
patent: 3401614 (1968-09-01), Gunther
patent: 3540365 (1970-11-01), Ishizaka
patent: 3601027 (1971-08-01), Ono
patent: 4103311 (1978-07-01), Horigome
patent: 4311376 (1982-01-01), Haraguchi

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