Optics: image projectors – Unitary plural refracting surfaces
Patent
1997-08-18
2000-11-07
Dowling, William
Optics: image projectors
Unitary plural refracting surfaces
353101, G03B 2114
Patent
active
061426342
ABSTRACT:
A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid crystal light valves of each color via an integrator optical system. First and second lens plates of an integrator optical system that serves as a uniform illuminating optical system are disposed such that the attachment position thereof is capable of fine adjustment in a direction vertical to the optical axis. By performing fine adjustment of the attachment position of these, the forming position of the illumination range B can be adjusted to include the image forming range A of the liquid crystal light valves. Accordingly, there is no need to provide a wide margin around the image forming range A, taking shifting of the forming position of the illumination range B into consideration. Thus, efficient usage of the illumination light can be increased, thereby improving the brightness of the projected image.
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Haba Shinji
Hashizume Toshiaki
Iechika Hisashi
Ogawa Yasunori
Yajima Akitaka
Dowling William
Seiko Epson Corporation
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