Optical scanning unit for reading information from an optical re

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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Details

369122, 350287, G11B 700, G02B 718

Patent

active

044532415

ABSTRACT:
An optical scanning unit for scanning recording tracks of a record carrier with a radiation beam. The beam is emitted by a radiation source arranged at one end of a tubular member and is concentrated to a radiation spot by a lens system arranged at the other end of the tubular member. A double prism disposed between the source and lens system splits-off a reflected secondary radiation beam and directs it laterally towards an electronic output device through a lateral aperture in the tubular member. The output device converts the modulated reflected radiation into an electrical signal. The radiation source and the double prism are radially and axially aligned within the required tolerances on a metal prism support which, within an adjustment range, can be moved axially relative to the tubular member and which can be rotated to a limited extent. The support is fixed relative to the tubular member after the reflected beam has been made to impinge on the radiation-sensitive means in the correct manner by said movement and rotation.

REFERENCES:
patent: 4067044 (1978-01-01), Maeda et al.
patent: 4334300 (1982-06-01), Arquie et al.
patent: 4337531 (1982-06-01), Willemsen

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