Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1991-03-11
1993-05-25
Henry, Jon W.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359629, 359638, 362 32, 385133, G02B 2714
Patent
active
052145360
ABSTRACT:
Apparatus for producing a continuous line of light for a document scanner. An incoherent light beam is directed into one surface of an optical wedge device. The light beam is repeatedly reflected, back and forth, between input and output reflective surfaces on the wedge. The output surface is only partially reflective, thereby allowing a portion of the light to escape the wedge and provide the line of light which illuminates the document. Non-parallel sides extending between the reflective surfaces are used to provide total internal reflection and concentrate all of the incoherent light beams into a smaller area, Alignment of the incoherent light beam according to a predetermined angle causes the escaping light beams to be adjacent to each other and produce a uniform and continuous line of light free from destructive interference areas.
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patent: 4093354 (1978-06-01), Leeb
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patent: 4576436 (1986-03-01), Daniel
patent: 4660932 (1987-04-01), Eckbreth
patent: 4930867 (1990-01-01), Negishi
Henry Jon W.
International Business Machines - Corporation
Tennent A. P.
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