Laser scanning unit and laser printer

Abstract

The invention provides a laser scanning unit and a laser printer. The laser scanning unit comprises a laser generator, a curved lens, a polygonal mirror motor and an illuminated face which are arranged along an optical path; and the curved lens is provided with an optical structure for realizing focusing of laser beams generated by a laser generator in the vertical direction and the horizontal direction simultaneously. Focusing is realized in the vertical direction and the horizontal direction simultaneously through the design, a regular light spot meeting the requirement is formed on the illuminated face in the distance, and finally a latent image is formed on the surface of the illuminated face. Therefore, only one optical shaping and focusing is needed, and divergent beams at differentangles after reflection of the polygonal mirror motor do not need to be focused respectively, so that the design validation cycle of optical development is greatly shortened; compared with the prior art, an FTL lens is not needed any longer, the development cost is saved, and the production cost is greatly reduced; and moreover, the reduction of optical elements is beneficial for the control of tolerance stackup, and the overall optical performance is more stable.

Description

technical field [0001] The invention relates to the technical field of laser scanning devices, in particular to a laser scanning unit and a laser printing device. Background technique [0002] In current laser printers, the laser unit mostly adopts a laser scanning unit (LSU) and a laser matrix (LPH). Such as figure 1 As shown, the laser scanning unit on the market includes a laser generator (LD) 100 , a collimator lens group 101 , a polygon mirror motor 102 , an FTL lens 103 and an optical receiving surface (OPC) 104 . The laser beam emitted by the laser generator is a divergent beam. The divergent beam passes through the collimator lens group and focuses on the mirror surface of the polygon mirror motor once; the laser light reflected by the polygon mirror motor diverges, passes through the FTL lens, and is focused on the surface of the light-receiving surface for the second time. Focus to form a spot. The photosensitive coating on the surface of the light-receiving sur...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the complex optical design of the FTL lens in the prior art, resulting in a long development cycle; extremely high mold precision requirements, high manufacturing costs and other defects, thereby providing a laser scanning unit and a laser printer

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