Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-12-23
1995-04-04
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359634, 353 31, 348744, 348 41, G02B 532, G02B 2714, H04N 931, G03B 2100
Patent
active
054042348
ABSTRACT:
This specification discloses a method of dividing a radiation beam into a first beam and a second beam differing in color from each other, modulating the first and second beams to thereby form first and second modulated beams indicative of images differing in color from each other, and projecting the images by the use of the first and second modulated beams. The radiation beam is divided into the first and second beams by a hologram. The specification also discloses a projector having a first optical system provided with a first volume type holograms for reflectively diffracting a first beam of a certain color in a radiation beam from a radiation source and transmitting a second beam of another color therethrough to thereby resolve the radiation beam, means for modulating the first beam and generating a first modulated beam indicative of a first image, and modulating the second beam and generating a second modulated beam indicative of a second image, and a second optical system provided with a second volume type hologram for reflectively diffracting the first modulated beam and transmitting the second modulated beam therethrough to thereby combine the two beams, the second optical system projecting the first and second images onto a predetermined plane by the use of the combined beams.
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Patent Abstracts of Japan, vol. 10, No. 158 (E-409), Jun. 6, 1986; Japan 61 013 885 to Nagamuro Masami.
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Mitsutake Hideaki
Taniguchi Naosato
Canon Kabushiki Kaisha
Parsons David R.
Sikes William L.
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