Illumination device and image scanning device

Optical waveguides – Noncyclindrical or nonplanar shaped waveguide

Reexamination Certificate

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Details

C362S551000, C362S555000, C362S231000, C362S609000, C359S475000, C359S484010, C359S509000

Reexamination Certificate

active

07555194

ABSTRACT:
An improved illumination device shortens a redundant area of insufficient light intensity close to a longitudinal end thereof. The device includes a casing, a bar-shaped light guide housed in the casing to cause a light-emitting surface thereof to be exposed, a light-emitting unit secured to an end section of the casing, wherein light from the light-emitting unit is introduced into the bar-shaped light guide through the end face thereof and is totally reflected within the bar-shaped light guide to be emitted through the light-emitting surface, and a shielding section provided to cover an end section of the bar-shaped light guide including the redundant area at the end section of the casing close to the light-emitting unit. A notch is formed at the end section of the bar-shaped light guide on the light-emitting surface side close to the light-emitting unit, and light from the light-emitting unit is reflected on a rear surface of the shielding section through a gap between this notch and the light-emitting unit to be introduced into the bar-shaped light guide.

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patent: 6357903 (2002-03-01), Furusawa et al.
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patent: 06-217084 (1994-08-01), None
patent: 2003-281913 (2003-10-01), None
patent: 2003348299 (2003-12-01), None
patent: 2004-146870 (2004-05-01), None
Derwent English Abstract of Japanese Publication JP 2003348299 A, Dec. 5, 2003.

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