Polarization separating element having partially polarizing prop

Details Polarization separating element having partially polarizing prop Polarization separating element having partially polarizing prop

1999-02-05

2000-05-30

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369110, 369112, G02B 530, G11B 700

Patent

active

060698594

ABSTRACT:
A polarization separating element 1 is produced by forming a polydiacetylene derivative film 11 on the surface 101 of a glass substrate 10 as an optically isotropic substrate, and selectively irradiating the polydiacetylene derivative film 11 with ultraviolet rays to form a grating 12 which has periodic grooves and two hues and exhibits partially polarizing properties. In a light pickup device containing the polarization separating element 1 having partially polarizing properties, part of the light reflected on an optical disk reaches a receptor without fail even if the optical disk has birefringence, whereby the recorded information can be reproduced with no problem.

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patent: 5739952 (1998-04-01), Takeda et al.
patent: 5793733 (1998-08-01), Takeda et al.
patent: 5822293 (1998-10-01), Lee et al.

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