H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 1/04 (2006.01) H04N 1/00 (2006.01) H04N 1/10 (2006.01) H04N 1/46 (2006.01) H04N 1/193 (2006.01)
Patent
CA 2096155
A scanner provided with means for reading both reflective and transmissive documents, comprises: two CCD sensors, one for reflection mode to read reflective documents, and the other for transmission mode to read transmissive documents, disposed respectively on one side of a light source, and on the opposite side thereto with a document table therebetween; and a reflective/transmissive document mode discriminating means wherein, when a light source is turned on, a judgment is made on whether or not light to be transmitted is blocked. The circuits of CCD sensors can be automatically changed between transmission mode and reflection mode. Specifically, a reading window disposed in a transmissive document reading unit is equipped in a detachable manner with either a blocking member for preventing light from entering the transmissive document reading unit, or a diffusing plate for scattering incident light so as to introduce uniform light into said transmissive document reading unit. Alternatively, light from light sources is color-separated by dichroic mirrors into blue, red and green light beams, and thus obtained desirable light is reflected and transmitted through a beam splitter to read a document with no diffusing plate. In this case, light beams are aligned in proceeding direction by the dichroic mirrors, so that color reproduction performance of an original document having unevenness can be improved.
Gomi Masayuki
Motowaki Kazuyuki
Nagano Fumikazu
Tanaka Kenji
Tsuchiya Shinichi
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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