Electronically adjustable position-sensitive radiation detector

Details Electronically adjustable position-sensitive radiation detector Electronically adjustable position-sensitive radiation detector

1986-11-10

1989-03-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250211J, 369 45, G11B 509

Patent

active

048108715

ABSTRACT:
A position-sensitive radiation detector, which on a plane surface has at least two adjacent reverse-biassed radiation-sensitive diodes, includes a bias circuit for establishing differences in the reverse voltages across the diodes in order to adjust the boundary between the radiation-sensitive areas of the diodes. To adjust the position of the boundary relative to the locations where a radiation beam is incident on the detector use can be made of the photoelectric currents generated in the radiation-sensitive diodes by the radiation beams for comparing the actual position of the boundary with the desired position of the boundary. The position-sensitive radiation detector is particularly suitable for use in the focus-error detection system of an optical read and/or write apparatus.

REFERENCES:
patent: 3704376 (1972-11-01), Lehovec et al.
patent: 3742223 (1973-06-01), Carr et al.
patent: 3870887 (1975-03-01), Dueker et al.
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4273998 (1981-06-01), Kanamaru

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