Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1987-05-21
1991-01-08
Adams, Russell E.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354403, G03B 1336
Patent
active
049830333
ABSTRACT:
An automatic range finder for a camera for setting the focus position of the camera to correspond to the closest object to the camera within a specified field of view. Infrared light sources are sequentially activated to project infrared beams, through a light projecting lens, within the specified field of view. A condenser lens, positioned a predetermined base length apart from the optical axes of the light sources and having an optical axis parallel to that of the light projecting lens, focuses the returned beams onto a light detecting element having a light receiving surface arranged perpendicular to the optical axis of the condenser lens. The light detecting element produces a signal indicative of the positions of the sequential light spots received thereon. A signal processing circuit determines which value of the output signal of the light detecting element corresponds to the closest object, and sets the focus position of the camera accordingly.
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Adams Russell E.
Asahi Kogaku Kogyo Kabushiki Kaisha
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