Device for scanning a radiation-reflecting information surface w

Details Device for scanning a radiation-reflecting information surface w Device for scanning a radiation-reflecting information surface w

1986-12-08

1988-09-13

Psitos, Aristotelis M.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 369112, 369109, 35016217, 3501622, 250201DF, G11B 1210, O11B 700

Patent

active

047714115

ABSTRACT:
An optical scanning device is described which comprises a radiation source (6), an objective system (8) and a diffraction grating (9) which is arranged between the objective system and the radiation source to separate the radiation beam (b') reflected by the information surface (2) to be scanned from the beam (b) emitted by the radiation source and for introducing astigmatism in the reflected beam (b') for the purpose of focus-error detection. In principle, the grating (9) has a constant grating period and is arranged at a small angle (.alpha.) in the beam (b').

REFERENCES:
patent: 4289371 (1981-09-01), Kramer
patent: 4358200 (1982-11-01), Heemskerk

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