Automatic focus control device

Details Automatic focus control device Automatic focus control device

1975-07-08

1976-07-20

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354 25, 356 4, G01J 120

Patent

active

039708420

ABSTRACT:
An automatic focus control device has an optical system including an image scanner. The image scanner is disposed between a range-finding lens and at least one light receptor element and on the path of travel of the incoming light towards the light receptor element through the range-finding lens. A mechanism is also disclosed for simultaneously measuring the object-to-lens distance and detecting the contrast of an image of the object projected on the scanner merely by moving the scanner in a direction diverging from the optical axis while a parallel relation between the plane of the scanner and the plane perpendicular to the optical axis is retained.

REFERENCES:
patent: 3781110 (1973-12-01), Leitz et al.
patent: 3849643 (1974-11-01), Takeda
patent: 3896304 (1975-07-01), Aoki et al.

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