Image reading apparatus, its light source, and shading correcting apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 29, 2007
Grant Date -
May 16, 2002
app pub date -
Nov 14, 2001
filing date -
Nov 15, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an image reading apparatus using a contact image sensor, an area light source for reading an image from a film original is provided. The area light source has a light guide plate and an LED device in the center of a side surface on the shorter side of the plate. In the LED device, red-, green-, and blue-LED chips are mounted on the same package and red-, green-, and blue-light are switched and lit. A white bottom plate covers the bottom surface of the light guide plate and a white case frame covers the four side surfaces. A scattering sheet is adhered to the upper surface of the white case frame, that is, a light emitting surface. On the rear surface of the light guide plate, light scatterers are formed by screen printing so that a specific pattern is drawn by high-reflectance white ink.
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Cited Art Landscape
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