Optical pick-up device and method using a high-density double di

Details Optical pick-up device and method using a high-density double di Optical pick-up device and method using a high-density double di

1997-06-26

1999-09-21

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 7095

Patent

active

059563028

ABSTRACT:
An optical pick-up having a high-density double diffraction grating constructed with two high-density diffraction gratings superposed on each other wherein polarized light rays are separated so that P-polarized light rays pass through the double diffraction grating and S-polarized light rays are diffracted. The optical pick-up is disposed in the optical path between a light source and a recording medium.

REFERENCES:
patent: 5101389 (1992-03-01), Ohuchida et al.
patent: 5243583 (1993-09-01), Ohuchida et al.
patent: 5360970 (1994-11-01), Kay
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5391865 (1995-02-01), Kurata et al.

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