Information recording apparatus

Details Information recording apparatus Information recording apparatus

1989-11-20

1992-03-31

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, G11B 700

Patent

active

051013924

ABSTRACT:
Prior to emitting a light beam from an optical head, an information recording apparatus moves the optical head in the direction of the optical axis so as to render the light beam in a defocused state on an optical recording medium. Then, the size of the emitted light beam is detected by a detector.

REFERENCES:
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patent: 4656617 (1987-04-01), Nakatsuyama et al.
patent: 4703466 (1987-10-01), Konno
patent: 4773052 (1988-09-01), Sugiura et al.
patent: 4998233 (1991-03-01), DiMatteo et al.
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5020045 (1991-05-01), Smart et al.

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