Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-12-12
1991-12-31
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
372 28, 359 66, 359502, G02F 11335, G02F 123
Patent
active
050766694
ABSTRACT:
A method and apparatus for selectively blocking light beams of different wavelengths with the use of a single color-sensitive filter by passing the beams through a multiple layer system consisting of an input polarization plate (12), an output polarization plate (14), a liquid crystal cell (18) sandwiched between voltage-controlled matrices (20a and 20b), and a mosaic color mask (34). The incident light is detected by a photoelectronic sensor (32) which sends voltage signals to respective pixels (22) which form the above-mentioned matrices. These signals selectively control the polarization states of the beams passed through the respective pixels. Depending on the polarization states of the beams, the output polarization plate can either block the light or pass it to a color mask (34). This mask consists of a periodical set of color cells, the amount and dimensions of which correspond to those of the pixels. As a result, the mask selectively filters the beam in accordance with its pattern.
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Black Michael
Kupershmidt Vladimir
Arnold Bruce Y.
Lerner Martin
Pressman David
Reliant Laser Corp.
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