Optical: systems and elements – Single channel simultaneously to or from plural channels – By surface composed of lenticular elements
Patent
1998-12-09
2000-04-04
Ben, Loha
Optical: systems and elements
Single channel simultaneously to or from plural channels
By surface composed of lenticular elements
359618, 359630, 359558, 359 15, 349 5, 349 95, 349201, 362268, G02B 2710
Patent
active
060468564
ABSTRACT:
In an illumination device used for a color image projector, indefinitely polarized light beams from a light source are separated by a polarization beam splitter into two linearly polarized light beams respectively having polarized planes perpendicularly intersecting to each other. One of the two polarized light beams is made to have the same polarized plane as that of the other by a 1/2.lambda. wave-plate. Second and third lens arrays are respectively placed at positions where an optical distance from a first lens array to the second lens array is the same as that from the first lens array to the third lens array. Principal rays of luminous fluxes outputted from microlenses of the second and third lens arrays are made to be parallel to each other and to a superimposing lens. The illumination light outputted from the superimposing lens illuminates a display device in a telecentric optical system using optically a visual field lens. The illumination light has a large cone angle in a diffraction direction of a hologram color filter provided on an LCD display device compared with that in a direction perpendicular to the diffraction direction.
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Kobayashi Tatsuru
Takahashi Ryusaku
Ben Loha
Lieberstein Eugene
Meller Michael N.
Victor Company of Japan Ltd.
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