Optics: image projectors – Reflector
Patent
1993-11-19
1996-02-13
Dowling, William C.
Optics: image projectors
Reflector
353 37, 359 49, 362298, 362346, F21V 702, G03B 2128
Patent
active
054915252
ABSTRACT:
A bulb (4) of lamp (1) has a reflection film (2) or reflection mirror (9) to make light components going outside a reflector (3) direct to the reflector (3) to reflect. If the lamp (1) is a spot light source, a light emission center is positioned at a center of spherical reflection mirror (9). If the lamp (1) is not a spot light source, the reflection mirror (9) is made ellipsoid and at its two focal points, ends of two light emitting electrodes are positioned. Also, the lamp (1) having the reflection mirror (9) is used in the illumination unit for a liquid crystal display apparatus to increase the brightness of the image projected onto the screen (26). Further, the liquid crystal display device (23) has within a liquid crystal display device (23) a microlens array for collecting the incoming light into an area of each picture element electrode (39) to increase the light utilization efficiency of the liquid crystal display device (23).
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Ariki Yoshio
Deguchi Masaharu
Hisada Takanori
Kakuda Takashi
Maruyama Takesuke
Dowling William C.
Hitachi , Ltd.
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