Optical read unit for scanning a record carrier having a...

Details Optical read unit for scanning a record carrier having a... Optical read unit for scanning a record carrier having a...

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01) H01S 5/024 (2006.01) H01S 5/062 (2006.01)

Patent

CA 1109559

ABSTRACT: An optical read unit is described for scannning a record carrier with a radiation-re- flecting trackwise-arranged information structure. The read unit comprises a diode laser which supplies a read beam and also detects the information. The diode laser is furthermore provided with opto- electronic means for detecting the position of the read spot relative to a track to be read and the position of the plane of focussing. The optical read unit is externally provided with electro- mechanical means for moving the unit in its longi- tudinal direction or in transverse directions. The objective system for the formation of the read spot is of simple construction. - 49 -

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