Optical pick-up device composed of composite prism made of uniax

Details Optical pick-up device composed of composite prism made of uniax Optical pick-up device composed of composite prism made of uniax

1996-04-17

1998-02-17

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369120, 369 4423, G11B 708, G11B 7135

Patent

active

057198454

ABSTRACT:
The present invention provides an optical pick-up device comprising a composite prism in which a prism made of non-axial crystal and a prism made of uniaxial crystal are adhered to each other and a grating, and separating into an extraordinary ray and an ordinary ray by means of the prism made of the uniaxial crystal, and further diffracting each of the extraordinary ray and the ordinary ray to o order ray, + primary ray and - primary ray by means of the grating, and then carrying out an optical detection based on the above mentioned diffracted light.

REFERENCES:
patent: 5428596 (1995-06-01), Hineno et al.
patent: 5508992 (1996-04-01), Hirose et al.
patent: 5523994 (1996-06-01), Ando et al.
patent: 5579291 (1996-11-01), Matsumoto

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