Information processing apparatus using a beam splitting means ha

Details Information processing apparatus using a beam splitting means ha Information processing apparatus using a beam splitting means ha

1990-04-27

1991-12-17

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 369112, G11B 1112, G11B 714, G11B 1304

Patent

active

050738798

ABSTRACT:
In an optical head, a light beam is emitted from a semiconductor laser which is rotatably supported and is guided to an optical disk through a beam splitter having a non-polarization beam split surface. The light beam reflected from the optical disk is reflected from the non-polarization beam split surface of the beam splitter, and directed to an photo-detector. The non-polarization beam split surface has reflectances which are determined so that E(1-Rp)Rp/E(1-Rs)Rs falls within a range of 1/2 to 2, where E is a ratio of an intensity of a light beam generated by said light source means to an intensity of a light beam returned to said non-polarization beam split surface, and Rs and Rp are reflectances with respect to the S and P polarized light components.

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