Laser scanning unit and image forming apparatus having the same

Abstract

The invention discloses a laser scanning unit and image forming apparatus having the same. It includes a first optical system having a plurality of beam sources. A first optical deflector respectively deflects beams emitted from the beam sources in different directions. A plurality of scanning lenses correct errors of the beams deflected from the first optical deflector. A plurality of reflection mirrors respectively reflect the beams passing through the scanning lenses to a plurality of surfaces to be scanned. A second optical system has a plurality of beam sources. A second optical deflector respectively deflects beams emitted from the beam sources of the second optical system in different directions. A plurality of scanning lenses correct errors of the beams deflected from the second optical deflector. A plurality of reflection mirrors respectively reflect the beams passing through the scanning lenses to a plurality of surfaces to be scanned. At least the first and the second optical deflectors of the first and the second optical systems are respectively arranged on planes different from each other.

Description

technical field [0001] The present invention relates to a laser scanning unit used in an image forming apparatus such as a printer or a copier. More specifically, the present invention relates to a laser scanning unit (hereinafter referred to as "LSU") and an image forming apparatus having the laser scanning unit, which has Multiple beam sources that simultaneously scan laser beams across a surface to form an image on a photoreceptor. Background technique [0002] Generally, a tandem color imaging device includes an imaging unit having a plurality of developing devices, an LSU having a plurality of optical systems arranged in parallel, and a plurality of photoreceptors on the surfaces of the plurality of photoreceptors. agent image. [0003] The tandem color image forming device forms a color image by rotating a plurality of photoreceptors only once, compared to a general color image forming device that forms a color image by rotating one photoreceptor multiple times. The...

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Problems solved by technology

Therefore, when the surface precision is increased by using the mirrors 14a and 14b having excellent surface precision, there is a disadvantage that the manufacturing cost increases

[0012] Furthermore, in the tandem color imaging device 1, since the first scanning optical system 9 and the second scanning optical system 30 use the polygon mirror 12 each having four reflective surfaces, even if the rotational speed of the polygon mirror is increased to increase the scanning speed, scanning The increase in speed is also limited

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