| US 7,602,541 B2 | ||
| Optical beam scanning apparatus and image forming apparatus | ||
| Masao Yamaguchi, Katsushika-ku (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 30, 2007, as Appl. No. 11/694,537. | ||
| Prior Publication US 2008/0239438 A1, Oct. 02, 2008 | ||
| Int. Cl. G02B 26/08 (2006.01) | ||
| U.S. Cl. 359—205.1 [359/207.7; 359/208.1] | 20 Claims |
| 1. An optical beam scanning apparatus comprising:
a light source configured to emit one or plural luminous fluxes,
a pre-deflection optical system configured to form a luminous flux emitted from the light source to image the luminous flux
as a line image in a prescribed direction corresponding to a main scanning direction,
a scanning unit configured to scan the imaged luminous flux by the pre-deflection optical system against a scanning subject,
and
a post-deflection optical system configured to image the luminous flux scanned by the scanning unit on the scanning subject,
in which a width of the luminous flux made incident on the scanning unit from the pre-deflection optical system is wider than
a width of one reflecting surface forming the scanning unit, wherein
at least two sheets of flat plate configured to transmit the luminous flux scanned by the scanning unit are provided in the
post-deflection optical system.
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