Optical head

Details Optical head Optical head

1996-04-26

1998-02-10

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369112, 369 13, G11B 700

Patent

active

057176752

ABSTRACT:
An optical head of the present invention applies p-polarized light from a semiconductor laser chip to a magneto-optical disk in the form of a spot through a collimator lens and an objective. The optical head has a polarized-light separating hologram device for separating only an s-polarized light component from the reflected light. A hologram formed on the hologram device has two polarized-light separating surfaces divided by a line in the direction corresponding to the information track direction. Beams separated on the separating surfaces are guided to two information-reproducing photodetectors, respectively. A transparent cover of a semiconductor laser apparatus is provided with a separating hologram. A beam separated on the hologram is guided to a multi-division photodetector used for auto-focusing and auto-tracking operations. The information-reproducing photodetectors, the multi-division photodetector, and the semiconductor laser chip are formed on a common substrate. With this arrangement, a smaller and lighter optical head can be achieved.

REFERENCES:
patent: 5450376 (1995-09-01), Matsumura et al.
patent: 5495461 (1996-02-01), Komma et al.
patent: 5519685 (1996-05-01), Kato et al.

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