G - Physics
03
B
95/62, 95/53.4,
G03B 7/08 (2006.01) G02B 7/28 (2006.01) G03B 17/16 (2006.01)
Patent
CA 1173284
ABSTRACT OF THE DISCLOSURE An automatic focus system for a camera in which a beam of light is directed toward a subject from a light source within the camera, and a portion of the light beam reflected from the subject back to the camera is sensed by photoelectric means. The angle between the emitted light and the reflected beam is translated by mechanical means into a mechanical movement which is a function of the distance to the point of reflection. The auto focusing system as herein described provides a zoom lens system in which the zoom lens is adjustable to change from a normal focal length to a longer focal length and in which a subject may be brought into focus by axial movement of at least one lens component of the zoom lens system. The zoom lens is located in front of a screen in the camera and the zoom lens system is arranged to focus the viewing subject thereon. An auto focus system herein described comprises a pick-up lens including a zoom system, a distance measuring light source and a distance measuring light receiving portion, said pick-up lens having a focus adjusting mechanism, the distance measuring light source being illuminated, and a detecting device for detecting the angle of the reflected light beam emitted from said light source and reflected by the subject, the focus adjusting mechanism being driven in accordance with the detected distance determined by the measurement output and either of the distance measurements.
397160
Gowling Lafleur Henderson Llp
Sony Corporation
LandOfFree
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