Polarizing conversion device, polarizing illuminations device, a

Details Polarizing conversion device, polarizing illuminations device, a Polarizing conversion device, polarizing illuminations device, a

1999-08-11

2000-11-28

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359618, 359619, 359483, 359485, 353 20, 353 31, 353 97, G02B 2714, G02B 2710, G02B 530, G03B 2114, G03B 2100

Patent

active

061543209

ABSTRACT:
A polarizing conversion device in accordance with the invention includes a first optical element for condensing an incident beam and forming a plurality of intermediate beams spatially separated from one another, and a second optical element for spatially separating each intermediate beam into two polarized beams and aligning the polarization directions of the polarized beams, thereby obtaining the same type of polarized beams. In the second optical element, a shading plate is placed to prevent light from directly entering a section corresponding to a reflecting plane of a polarizing separation unit array. Since the ability of separating the intermediate beam into two polarized beams is thereby enhanced, it is possible to perform conversion into the same type of polarized beams polarized in the same direction, with high efficiency.

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patent: 5751480 (1998-05-01), Kitagishi
patent: 5978136 (1999-11-01), Ogawa et al.

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