| US 7,538,911 B2 | ||
| Lighting device image, reading apparatus, and image forming apparatus | ||
| Yasuo Sakurai, Kanagawa (Japan); and Masashi Kohchi, Tokyo (Japan) | ||
| Assigned to Ricoh Company, Limited, Tokyo (Japan) | ||
| Filed on Aug. 19, 2004, as Appl. No. 10/921,283. | ||
| Claims priority of application No. 2003-295160 (JP), filed on Aug. 19, 2003; application No. 2003-390764 (JP), filed on Nov. 20, 2003; and application No. 2004-006448 (JP), filed on Jan. 14, 2004. | ||
| Prior Publication US 2005/0088707 A1, Apr. 28, 2005 | ||
| Int. Cl. H04N 1/04 (2006.01); G02B 6/32 (2006.01); F21V 7/04 (2006.01) | ||
| U.S. Cl. 358—475 [358/474; 358/484; 385/34; 385/36; 362/611; 362/624] | 14 Claims |
| 1. A lighting device comprising:
a point light configured to emit rays;
a condensing body arranged in a direction of the rays emitted from the point light source and configured to condense the rays
on a surface of a document, which is placed on a contact glass, within a reading width in a sub-scanning direction of the
document, wherein the condensing body is arranged in an area close to a reading light reflection area in which the rays reflected
on the surface of the document travel along a reading optical axis: and
a reflection plate arranged between the point light source and the condensing body, wherein a width dimension of an inner
surface of the reflection plate is set to be equal to or smaller than a width dimension of the condensing body.
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