Optical head device and optical information...

Details Optical head device and optical information... Optical head device and optical information...

2005-05-17

2009-10-06

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020

Reexamination Certificate

active

07599276

ABSTRACT:
In an optical head device, a birefringence correcting element5acontaining a material showing mono-axial refractive index anisotropy is located before an objective lens. The birefringence correcting element5ais circumferentially divided into four regions by two straight lines passing through an optical axis and intersecting each other at right angle. Each of the four regions is radially divided into four sub-regions by three circles centered at the optical axis. The direction of optic axes of the sub-regions11ato14aand11cto14cis a direction of x-axis, while the direction of optic axes of the sub-regions11bto14band11dto14dis a direction of y-axis. A phase difference of sub-regions between a polarized light component polarized in a direction parallel to the optic axis and another polarized light component polarized in a direction vertical to the optic axis increases in order of the sub-regions11ato11d,sub-regions12ato12d,sub-regions13ato13dand the sub-regions14ato14d.

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Yoshizawa, “An Analysis of Optical Anisotropy of PC Substrate for Magneto-Optical Disc”, Kogaku, Oct. 1985, vol. 15, No. 5, pp. 414-421.

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