View finder for a single lens reflex camera

Details View finder for a single lens reflex camera View finder for a single lens reflex camera

1974-08-16

1976-08-17

Peters, Jr., Joseph F.

354 155, 354187, G03B 1316, G03B 1912

Patent

active

039757501

ABSTRACT:
A first focusing optical system including a mirror is located behind the taking lens of a single lens reflex camera for reflecting the light coming through the taking lens at an angle with respect to the optical axis thereof and forming an inverted real image of an object to be photographed on the first focal plane in reduced scale. A second focusing optical system is provided behind the first focal plane to form an erected real image of the object on a second focal plane. The erected real image is viewed through an eyepiece as a virtual image in enlarged scale. In an embodiment of the invention, a concave mirror is used as the first focusing optical system. In a preferred embodiment of the invention, the first focusing optical system behind the taking lens is moved into and out of the optical axis of the taking lens in response to operations of the camera. Light intercepting members are moved in response to the movement of the first focusing optical system so that light intercepting member in the view finder may be closed and the light intercepting member in front of the film may be opened when the first focusing optical system is retracted from the optical axis of the taking lens and the shutter is released. When the shutter is charged, the first focusing optical system is brought into the optical axis of the taking lens and the light intercepting members in front of the film and in the view finder are opened and closed, respectively.

REFERENCES:
patent: 1631303 (1927-06-01), Washington
patent: 2168977 (1939-08-01), Crumrine
patent: 2521790 (1950-09-01), Haeseler
patent: 2811075 (1957-10-01), Chevallaz
patent: 2914997 (1959-12-01), Grey
patent: 3218948 (1965-11-01), Huppenbender
patent: 3613543 (1971-10-01), Mita et al.
patent: 3783760 (1974-01-01), Allen et al.
patent: 3821768 (1974-06-01), Urano et al.

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