Mirror operating mechanism in single lens reflex camera

摘要

A mirror operating mechanism in a single lens reflex camera having a first reflecting mirror which is provided to swing from the view finder observation position to the photographing retraction position. A second reflecting mirror introduces light passed through the first reflecting mirror at the finder observation position to a light measuring element. The second reflecting mirror is mounted swingably on the first reflecting mirror. The second reflecting mirror has a rotary shaft around which the second reflecting mirror can swing. Both ends of the rotary shaft are rotatably mounted on both sides of a frame supporting the first reflecting mirror. The end portion of an operating arm of the second reflecting mirror is brought into contact with a cam fixedly secured to a stationary member by means of a spring.