Image reading apparatus, its light source, and shading...

Details Image reading apparatus, its light source, and shading... Image reading apparatus, its light source, and shading...

2007-05-29

2007-05-29

Moe, Aung (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S475000, C358S509000, C359S599000, C359S831000

Reexamination Certificate

active

09992869

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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