Optical head and optical information reading apparatus

Details Optical head and optical information reading apparatus Optical head and optical information reading apparatus

1993-06-28

1996-02-06

Willis, Davis L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 726

Patent

active

054901294

ABSTRACT:
An optical head is used in a magnetic field modulation type magnetooptical recording/reproducing apparatus. The optical head includes a device for irradiating a magnetooptical record medium with a light beam, a separating device for separating a reflected light beam from the magnetooptical record medium into two beams to be projected onto a single plane, a single photodetector provided with two two-divided light receiving portions for respectively receiving the two beams, and a single convex lens element for forming images of the two beams as light spots on the single photodetector.

REFERENCES:
patent: 4866689 (1989-09-01), Satokata
patent: 5015835 (1991-05-01), Ohuchida et al.
patent: 5073888 (1991-12-01), Takahashi et al.
patent: 5258970 (1990-11-01), Kobayashi
"Write Verify System for Field Modulation Optical Recording", Research Disclosure, No. 320, Dec. 1990, Havant GB, p. 963, XP000163362.

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