Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-04-21
1995-10-17
Gross, Anita Pellman
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 42, 359 49, G02F 11335
Patent
active
054595924
ABSTRACT:
The present invention provides a lighting device including a light source; a reflecting mirror for reflecting light emitted by the light source in a determined direction; and a compensating element for receiving the light from the reflecting mirror and allowing the light to outgo in the form of parallel rays. Further, a projection type image display system including the above-mentioned lighting device and a display element for forming an image by receiving light from the lighting device is provided. According to the present invention, light can be emitted with a satisfactory degree of parallelization and an even illuminance, constant irregularity due to the photoelasticity can be degraded, and the degradation in brightness of a projected image due to a low ratio of aperture can be avoided. Thus, a uniform image with no illuminance irregularity can be projected.
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Hamada Hiroshi
Nakanishi Hiroshi
Shibatani Takashi
Shinomiya Tokihiko
Yamatani Takuji
Conlin David G.
Fournier Kevin J.
Gross Anita Pellman
Sharp Kabushiki Kaisha
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