| US 7,525,561 B2 | ||
| Optical scanner and image forming apparatus | ||
| Tomohiro Nakajima, Tokyo (Japan); Akira Kojima, Chiba (Japan); Ikuko Yamashiro, Kanagawa (Japan); Seizo Suzuki, Kanagawa (Japan); Taku Amada, Kanagawa (Japan); Yoshinori Hayashi, Kanagawa (Japan); and Kazuyuki Shimada, Tokyo (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Jun. 13, 2006, as Appl. No. 11/451,486. | ||
| Application 11/451486 is a division of application No. 10/609577, filed on Jul. 01, 2003. | ||
| Claims priority of application No. 2002-193652 (JP), filed on Jul. 02, 2002; application No. 2002-274073 (JP), filed on Sep. 19, 2002; application No. 2002-274075 (JP), filed on Sep. 19, 2002; and application No. 2002-276311 (JP), filed on Sep. 20, 2002. | ||
| Prior Publication US 2006/0232660 A1, Oct. 19, 2006 | ||
| Int. Cl. B41J 2/435 (2006.01); B41J 2/47 (2006.01) | ||
| U.S. Cl. 347—234 [347/248] | 18 Claims |
| 1. An optical scanner for scanning a plurality of image carriers comprising:
an illuminant part emitting a plurality of optical beams;
a deflecting part deflecting the optical beams;
an image forming part focusing the deflected optical beams on respective image carriers of the plurality of image carriers;
and
an optical axis adjustment part positioned between the deflecting part and the illuminant part, and vibrating a scanning position
with respect to a sub-scanning direction periodically during writing of an image, the optical axis adjustment part including
an amplitude or phase adjustment part adjusting a phase or amplitude of the scanning position being vibrated by the optical
axis adjustment part relative to an original scanning position including variations due to speed variations of rotation of
an image carrier, and the optical axis adjusting part adjusting beam spot positions of the optical beams on the plurality
of image carriers with respect to a sub-scanning direction by vibrating the beam spot positions of the optical beams on the
plurality of image carriers with respect to the sub-scanning direction slowly relative to a period of optical scanning.
|