Optical read apparatus for reading a disc-shaped record carrier

Details Optical read apparatus for reading a disc-shaped record carrier Optical read apparatus for reading a disc-shaped record carrier

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01) G11B 7/085 (2006.01) G11B 17/00 (2006.01)

Patent

CA 1149059

PHN 9250 ABSTRACT: An optical read apparatus for reading a disc- shaped record carrier. A read element is mounted on an adjusting member by means of which the read element is radially movable. Moreover, there is provided a deflec- tion element for correcting the radial position of the scanning spot. In order to enable an arbitrary informa- tion unit on the record carrier to be read with a short searching time, the drive of both the adjusting member and the reflection element is controlled. In order to enable the adjusting member to be moved in a rapid and controlled manner there is provided a position indicator, which indicates the instantaneous radial position of the read element. Moreover, there is included a correction circuit which eliminates the adverse effect of inaccur- acies in the position indicator on the searching time.

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