Polarizing beam splitter and optical pick-up head comprising the

Details Polarizing beam splitter and optical pick-up head comprising the Polarizing beam splitter and optical pick-up head comprising the

1995-04-27

1997-05-20

Epps, Georgia Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By refraction at beam splitting or combining surface

359639, 369110, G02B 2712, G11B 700

Patent

active

056317743

ABSTRACT:
A polarizing beam splitter for dividing a return light beam reflected by a magneto-optical record medium into two light beams polarized in mutually orthogonal directions, including a main body made of a birefringent crystal and having an incident surface upon which the return light beam is made incident and a reflection surface, and a reflecting member provided on the reflection surface of the main body and formed by a metal film or a stack of dielectric material films. Upon refraction by the incident surface of the main body, the incident light beam is split into ordinary and extraordinary light beams, which are then reflected by the reflection surface of the main body. An optic axis of the main body is set to be parallel with the reflection surface, the ordinary and extraordinary light beams are reflected as they are and emanate from the polarizing beam splitter.

REFERENCES:
patent: 4812637 (1989-03-01), Taki
patent: 5085496 (1992-02-01), Yoshida
patent: 5223975 (1993-06-01), Naganuma
patent: 5329397 (1994-07-01), Chang
patent: 5387991 (1995-02-01), Mitsutake
patent: 5422866 (1995-06-01), Yamaguchi
patent: 5426626 (1995-06-01), Katayama
patent: 5541906 (1996-07-01), Kobayashi

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