Semiconductor laser source optical reading head

Details Semiconductor laser source optical reading head Semiconductor laser source optical reading head

1980-06-24

1982-08-17

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

346 76L, 369112, 369122, G11B 712

Patent

active

043453210

ABSTRACT:
A 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. The device comprises a laser and an optical projection device for forming a reading spot which is an image of the source on the carrier. The laser is positioned on the optical axis of the optical device in such a way that the beam from the laser substantially illuminates half the entrance pupil of the optical system. The return beam reflected by the support emerges on 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.

REFERENCES:
patent: 3016464 (1962-01-01), Bailey
patent: 4004259 (1977-01-01), Kaneko
patent: 4143402 (1979-03-01), Bricot et al.
patent: 4163149 (1979-07-01), Sawano et al.
patent: 4203133 (1980-05-01), Bricot et al.

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