Semiconductor laser source optical reading head and device...

Details Semiconductor laser source optical reading head and device... Semiconductor laser source optical reading head and device...

G - Physics

11

B

352/32.1

G11B 7/00 (2006.01) G11B 7/08 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1155218

ABSTRACT OF THE DISCLOSURE Semiconductor laser source optical head for reading reflecting information carriers. The information is recorded on a track carried by the carrier in the form of a relief modulation. It comprises a laser and an optical projection device for forming a reading spot which is an image of the source of the said carrier. The laser is positioned on the optical axis of the optical device in such a way that the beam from the laser substan- tially illuminates half the entrance pupil of the optical system. The return beam reflected by the support emerges by the other half of the pupil. A deviating member is placed on the path of the return beam in order to displace the beam relative to the outward beam. Detection cells are conveniently placed in a detection plane parallel to the supports.

355078

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