Position sensitive radiation detector

Details Position sensitive radiation detector Position sensitive radiation detector

H - Electricity

01

L

358/20, 358/32,

H01L 31/02 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01) H01L 27/14 (2006.01) H01L 27/144 (2006.01) G11B 7/135 (2006.01)

Patent

CA 1273717

ABSTRACT A position-sensitive radiation detector (1), which on a plane surface comprises at least two adjacent reverse-biased radiation- sensitive diodes, comprises a bias circuit (20) for establishing differences in the reverse voltages across the diodes in order to adjust the boundary (15) between the radiation-sensitive areas of the diodes. To adjust the position of the boundary (15) relative to the locations where a radiation beam is incident on the detector (1) use can be made of the photoelectric currents generated in the radiation-sensitive diodes by the radiation beams (16;b) for comparing the actual position of the boundary with the desired position of the boundary. The position- sensitive radiation detector (1) is particularly suitable for use in the focus-error detection system of an optical read and/or write apparatus. (Figure 4).

540610

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