| US 7,532,370 B2 | ||
| Optical encoder, motor driver and image forming apparatus | ||
| Koichi Kudo, Tokyo (Japan); Takuroh Kamiya, Tokyo (Japan); Katsuya Kawagoe, Tokyo (Japan); Ryuuichi Mimbu, Tokyo (Japan); Junya Takigawa, Tokyo (Japan); Toshiyuki Andoh, Tokyo (Japan); and Yoshihiro Sakai, Tokyo (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Dec. 02, 2003, as Appl. No. 10/724,998. | ||
| Claims priority of application No. 2002-350092 (JP), filed on Dec. 02, 2002; and application No. 2002-351218 (JP), filed on Dec. 03, 2002. | ||
| Prior Publication US 2004/0160646 A1, Aug. 19, 2004 | ||
| Int. Cl. H04N 1/04 (2006.01); H04N 1/46 (2006.01) | ||
| U.S. Cl. 358—474 [358/509; 358/539] | 35 Claims |
| 1. An optical encoder comprising:
a light emitting unit that emits parallel light onto a plurality of marks that are arranged on an object at a predetermined
interval in a moving direction of the object; and
a light receiving unit that receives light modulated by the marks, wherein
a width, along the moving direction of the object, of the light emitted from the light emitting unit is shorter than the predetermined
interval.
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