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US 6,204,938 B1Granted
Linear illumination device and image reading apparatus using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsToshiro Horiuchi, Kohichi Takesako, Takashi Yamanaka, Yoshihiko Chosa, Tetsuro Nakamura
Life of this patent
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Abstract
A linear illumination device, includes: a light conducting body; a light diffusion portion formed at least on one side surface in a longitudinal direction of the light conducting body; a light output portion formed in a portion of the light conducting body opposing the light diffusion portion; a light source portion disposed at a first end of the light conducting body; and a light reflecting layer provided at a second end opposing the first end of the light conducting body.
Claims27
A linear illumination device, comprising:
- a light conducting body with at least a portion of a cross-sectional shape perpendicular to a longitudinal direction of the light conducting body having an arch shape;
- a light diffusion portion formed at least in the portion having an arch shape in the longitudinal direction of the light conducting body;
- a light output portion formed in a portion of the light conducting body opposing the light diffusion portion;
- a light source portion disposed at a first end face of the light conducting body;
- and
- a light reflecting layer provided at a second end face of the light conducting body opposing the first end face of the light conducting body,
- wherein an area of the cross-sectional shape of the light conducting body successively decreases along the longitudinal direction of the light conducting body from the first end face to the second end face.
4 more elements
Dependencies are inferred from the claim text.