Twisted nematic polarizing element with a concentric circle orie

Details Twisted nematic polarizing element with a concentric circle orie Twisted nematic polarizing element with a concentric circle orie

1990-09-14

1992-08-25

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 37, 385 37, G02F 113, G02F 11337, G02B 634

Patent

active

051423944

ABSTRACT:
An optical head device has a light source for emitting a light, a polarizing element for converting the linearly polarized emitted light into a concentric-circle polarized light or a radially polarized light, a concentric grating coupler through which the polarized light is introduced into a waveguide layer, and another polarizing element for converting the light radiated from the waveguide layer into a linearly polarized light. The light is applied to and reflected by the surface of an optical disk and introduced into the waveguide layer again as a concentric-circle polarized light or radially polarized light due to reversability of light, whereby the reflected light is detected. Each of the polarizing elements has a twist nematic liquid crystal layer having a linearly oriented liquid crystal orientation surface and a concentric-circle oriented liquid crystal orientation surface.

REFERENCES:
patent: 4991919 (1991-02-01), Nishiwaki et al.

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