Opto-electronic focus detection system

Details Opto-electronic focus detection system Opto-electronic focus detection system

1974-12-06

1976-07-13

Corbin, John K.

Telegraphy

Systems

Simplex-reversing periodic

178 66DD, 1791003V, 250201, 356122, 356125, G11B 712, G01V 104

Patent

active

039695751

ABSTRACT:
In an opto-electronic focus detection system for determining a deviation between the plane of focussing of an objective and a radiation-reflecting surface the path of a focussing beam which is reflected by said surface includes an assembly of two radiation-sensitive detection elements. The difference in the output signals of said elements is proportional to said deviation. By disposing a lenslike element of which only the outer zone has a lens action before the detection elements, the measuring range can be extended while maintaining the sensitivity for small deviations.

REFERENCES:
patent: 2550685 (1951-05-01), Garutso
patent: 3012469 (1961-12-01), Clayborne
patent: 3876841 (1975-04-01), Kramer et al.

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