| 摘要 |
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.
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