公开(公告)号：US20030210324A1

公开(公告)日：2003-11-13

申请号：US10423988

申请日：2003-04-28

Applicant: SAMSUNG Electronics Co., Ltd. of Republic of Korea

Inventor： Bu-hyun Sung ,  Chul-woo Lee ,  Soon-kyo Hong ,  Young-woo Huh

IPC: B41J015/14 ,  B41J027/00

CPC classification number: H04N1/506 ,  B41J2/473

Abstract: A color laser printer producing a color image using a single laser scanning unit includes a lighting unit including first and second laser diodes emitting beams of one polarization, a polarization prism transmitting or reflecting incident beams depending on a direction of polarization, and third and fourth laser diodes disposed in a different direction from the first and second laser diodes with respect to the polarization prism, a rotary polygon mirror that reflects the beam emitted along the same path from the lighting unit, an f-null lens that focuses the beam reflected by the rotary polygon mirror, first and second polarization beam splitters, each of which transmits or reflects the beam passing through the f-null lens depending on the direction of the polarization, and first through fourth photoconductive units on which the beams reflected and transmitted through the first and second polarization beam splitters are incident. In the color laser printer, lengths of optical paths between the f-null lens and each of the first through fourth photoconductive units are equal. The color laser printer is constructed such that a plurality of light sources emitting the beams of one polarization are arranged separately and the beams emitted from the light sources are combined by the polarization prism to enter the f-null lens, thereby reducing a thickness of the f-null lens.

Abstract translation: 使用单个激光扫描单元产生彩色图像的彩色激光打印机包括：照明单元，包括发射一个偏振光束的第一和第二激光二极管，根据偏振方向透射或反射入射光束的偏振棱镜;以及第三和第四激光器 相对于偏振棱镜设置在与第一和第二激光二极管不同的方向上的二极管，反射从照明单元沿相同路径发射的光束的旋转多面镜;聚焦由 旋转多面镜，第一和第二偏振分束器，每个偏振光束分离器根据偏振方向透射或反射穿过f-θ透镜的光束;以及第一至第四光电导单元，其上反射和透射通过第一 并且第二偏振分束器入射。 在彩色激光打印机中，f-theta透镜与第一至第四光电单元中的每一个之间的光路长度相等。 彩色激光打印机被构造成使得发射一个偏振光束的多个光源分开布置，并且从光源发射的光束被偏振棱镜组合以进入f-θ透镜，由此减小了 f-theta透镜。