Optical head for an optical recording and reproducing apparatus

Details Optical head for an optical recording and reproducing apparatus Optical head for an optical recording and reproducing apparatus

1987-12-01

1989-06-20

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369 46, 369112, 250201, G11B 700

Patent

active

048415073

ABSTRACT:
An optical head for optical recording and reproducing system comprising a light source, a first optical means for introducing a light beam from the light source into a guide groove formed in a recording surface of an information carrier, and a second optical means for separating a reflected light beam reflected from the guide groove from the light beam from the light source. The optical head also comprises an optical element having formed thereon at its center a cylindrical surface and on both sides slanted surfaces for dividing the reflected light beam into three, and a light receiving element having at least three light receiving units for receiving the respective light beams divided into three by the optical element.

REFERENCES:
patent: 4273998 (1981-06-01), Kanamaru
patent: 4406520 (1983-09-01), Sato et al.
patent: 4656618 (1987-04-01), Kaku et al.

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