Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-03-13
1979-07-17
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 55, G02B 2714
Patent
active
041613490
ABSTRACT:
A beam separating prism system for an imaging system having two pairs of prisms, each prism having a 30, 60, and 90 degree triangular cross section and being provided with a partially reflecting region situated between the common boundary of the pair. A nonreflecting entry surface of one pair receives light which is both not focused and not parallel as reflected from a document. The light received at the entry surface is separated into three light components by the prism system. The exit axes of two light components are parallel and the exit axis of the third light component is at an angle of approximately 60 degrees to the other exit axes. The light is received by the pair of prisms having the entry surface and intercepted by the partially reflecting region of the pair. The remaining light is transmitted by the partially reflecting region to form a first component which is then reflected along an exit axis. The light reflected by the partially reflecting region is deflected by the rear of the entry surface toward the other pair of prisms at an angle of approximately 60 degrees to the partially reflecting region of that other pair of prisms. The light received by that partially reflecting region is both reflected and transmitted to form the other two light components. These components are reflected by total reflecting surfaces of the prism pair along parallel axes. Thus, the light originally received by the prism system is separated into three light components or beams which are directed along two axes which are parallel and one axis which is at an angle of approximately 60 degrees to the other two axes.
REFERENCES:
patent: 3602637 (1971-08-01), Katsuta
patent: 3659918 (1972-05-01), Tau
patent: 3802763 (1974-04-01), Cook et al.
patent: 4009941 (1977-03-01), Verdi, Jr. et al.
patent: 4035836 (1977-07-01), Miyaji et al.
patent: 4072405 (1978-02-01), Ozeki
Corbin John K.
de los Reyes B. W.
Demond Thomas W.
Recognition Equipment Incorporated
Vandigriff John E.
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