Crystal optic lens and an optical system for an optical pickup d

Details Crystal optic lens and an optical system for an optical pickup d Crystal optic lens and an optical system for an optical pickup d

1996-07-30

1999-02-02

Spyrou, Cassandra C.

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359497, 359501, G02B 530

Patent

active

058673156

ABSTRACT:
A bifocal crystal optic lens made of a uniaxial crystal comprising two surfaces having a same axis, at least one of the two surfaces being a spherical surface or an aspherical surface. An optical system for an optical pickup device includes; a crystal optic lens consisting of a first lens body made of a transparent uniaxial crystal and a second lens body made of a transparent optical material selected from a second uniaxial crystal and an optical isotropic material, the first and second lens bodies joining via a spherically or aspherically curved interface; and an objective lens aligned with the crystal optic lens in a same optical axis of an incident ray. This optical system for the optical pickup device is capable of making simultaneously two focal points in the same axis, so as to simplify preferably the structure of the compatible video optical disc player for CD and SD to minimize the size thereof, thereby providing a relatively low cost for the manufacture thereof.

REFERENCES:
patent: 3990798 (1976-11-01), White
patent: 4534649 (1985-08-01), Downs
patent: 4566762 (1986-01-01), Kato
patent: 5142411 (1992-08-01), Fiala
patent: 5410375 (1995-04-01), Fiala

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