Oliff & Berridge, P.L.C.
Light illumination assembly having a tapered light guide plate for an optical reading unit
 An optical guide device in an optical reading system incorporated in a facsimile device, copying machine, image scanner and the like includes an array of LEDs and a light guide plate. When the light guide plate is cut along the longitudinal axis to give a cross-section in which the thickness appears, the cross-section is in a tapered shape and the thickness of the light guide plate at the side confronting the light array increases toward the opposite side facing the document. The light emerging from the light guide plate is high and uniform in light intensity level, so that a CCD unit picks up the light reflected from the document with high accuracy. 
Brother Kogyo Kabushiki Kaisha
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inventional additional inventional inventional
Akira Masaru Yasuhito Katsutoshi
Kobayashi Takeuchi Bandai Seguchi