Active-type auto-focusing mechanism

Optics: measuring and testing – Range or remote distance finding – With photodetection


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356 1, 356 4, G03B 300




An active-type autofocusing mechanism includes a light projector for projecting a light beam from a light source toward an object. A photo detector arrangement includes separate position-sensitive photo detectors disposed with equal spacing in opposite direction with respect to the light projector. A processor is connected to the photodetector arrangement for calculating the distance to the object.

patent: 4592637 (1986-06-01), Suda
patent: 4621917 (1986-11-01), Kaneda
patent: 4674855 (1987-06-01), Utagawa
patent: 4710011 (1987-12-01), Ushiro
patent: 4716430 (1987-12-01), Stauffer
patent: 4717819 (1988-01-01), Momiyama et al.


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