Optical head and optical information processor using the same

Details Optical head and optical information processor using the same Optical head and optical information processor using the same

1987-12-09

1989-10-10

Faber, Alan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, 369110, 369118, 369 44, 369 45, G11B 1112, G11B 709, G11B 712

Patent

active

048736783

ABSTRACT:
An optical head and an optical information processor using the optical head include a light source, focusing device for focusing a light beam which is emitted from the light source, on an information medium, beam separator for isolating at least part of a light beam which is reflected from the information medium, from the light beam emitted from the light source, a beam splitter including a first polarized-light separating film which is illuminated with about a half of a light beam isolated by the beam separator, and a light detecting device having a first photodetector which receives a first light beam reflected from the first polarized-light separating film, and a second photodetector which receives a second light beam passing through the first polarized-light separating film, in a state that at least one of the first and second photodetectors is separated into a pair of light detecting elements, to make it possible to detect a magneto-optical signal and a focal error signal by the same optical system.

REFERENCES:
patent: 4682315 (1987-07-01), Uejima
patent: 4683559 (1987-07-01), Emoto et al.
patent: 4684797 (1987-08-01), Ando et al.

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