Camera image plane size control device

Details Camera image plane size control device Camera image plane size control device

G - Physics

03

B

95/64

G03B 27/02 (2006.01) G03B 1/42 (2006.01) G03B 13/32 (2006.01) G03B 19/04 (2006.01)

Patent

CA 1319042

ABSTRACT OF THE DISCLOSURE Apparatus is provided for controlling the size of the image plane in a camera having a zoom lens. The apparatus includes one or more aperture frames (31, 32, 120) which define the image plane size, and an actuator which is adapted to move the aperture frame or frames along the film plane in accordance with the optical position of the exit pupil of a zoom lens. Two frames can be moved in opposite directions over an equal displacement. Further, a single frame (120) can be moved along the optical lens axis in order to ensure that the film remains substantially flat during photography, and is moved away from the film path during film winding and unwinding operations. Additionally, the frame can be provided with projecting portions along opposite side edges of a central aperture in order to control the image plane size.

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