Semiconductive radial photodetector and apparatus comprising suc

Details Semiconductive radial photodetector and apparatus comprising suc Semiconductive radial photodetector and apparatus comprising suc

1986-10-28

1988-08-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250211J, 250237R, G01D 534

Patent

active

047663073

ABSTRACT:
A photodetector for use in an angular displacement measuring apparatus consists a multiple photocell consisting of radially extending strip-shaped photodiodes (11 to 15). According to the invention, the diodes are connected alternately via switching electrodes (7) to an output electrode (6), which is constituted by a conductive image-defining shield arranged above the switching electrodes and comprises two opposite bands (AB, CD), whose widths (b.sub.1, b.sub.2) are substantially inversely proportional to their radii of curvature in order to reduce trouble by cross-talk. The photodetector may be an integrated circuit, which comprises besides the multiple photocell also a part of the processing circuit. The invention also relates to an apparatus for measuring angular displacements by means of such a photodetector.

REFERENCES:
patent: 3531650 (1970-09-01), Cronin
patent: 3757128 (1973-09-01), Vermeulen
patent: 3973119 (1976-08-01), Renes et al.
patent: 4373816 (1983-02-01), Laib
patent: 4577101 (1986-03-01), Bremer et al.
patent: 4654524 (1987-03-01), Kita
patent: 4658132 (1987-04-01), Nishiura et al.
patent: 4658133 (1987-04-01), Nishiura

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