Lighting device transformed in the direction of polarization and

Details Lighting device transformed in the direction of polarization and Lighting device transformed in the direction of polarization and

1996-05-31

1998-07-07

Chin, Tommy P.

Television

Video display

Projection device

348756, 348757, H04N 574, H04N 931

Patent

active

057776954

ABSTRACT:
In a light valve projection type image display device, a lighting device suitable for a device making use of polarization in particular is presented. A lighting device transformed in the direction of polarization comprising a light source, an elliptical mirror, polarized light selecting means positioned at a second focal point position of the elliptical mirror, collimating for transforming the light from the second focal point of the elliptical mirror into nearly parallel light while reflecting, polarization transforming provided in the collimating, and optical path transforming having an aperture in the central part is provided. The light is separated into first and second directions of polarization by the polarized light selecting. The light in the second direction of polarization is enters the collimating and the direction of polarization is transformed in the same direction as the light of the first direction of polarization. The light is reflected on the same optical axis as the light in the first direction of polarization by the optical path transforming having its aperture positioned to correspond to the position of the polarized light selecting.

REFERENCES:
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patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 5357289 (1994-10-01), Konno et al.
patent: 5381278 (1995-01-01), Shingaki et al.
patent: 5400180 (1995-03-01), Chung

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