Automatic focus servomechanism in optical information reading de

Details Automatic focus servomechanism in optical information reading de Automatic focus servomechanism in optical information reading de

1979-06-14

1981-09-01

Nelms, David C.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250204, 369112, G01J 136

Patent

active

042874130

ABSTRACT:
A focus servo apparatus for an optical information reading system is disclosed, which includes an optical system for a light from an information carrying surface of a recording medium composed of a condenser lens, a cylindrical lens and a light receiving element. A subsystem is employed for maintaining light illuminating focussed on the information carrying surface in response to an output of the light receiving element. The distance between the cylindrical lens and the light receiving element is larger than the focus distance of the lenticular lens.

REFERENCES:
patent: 4025949 (1977-05-01), Whitman
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4079247 (1978-03-01), Bricot et al.
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4163149 (1979-07-01), Sawano et al.

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