Sync signal detecting apparatus

Abstract

An apparatus to detect a synchronizing signal includes a reflective mirror arranged on a part of an optical path of a laser beam which forms an electrostatic latent image on a photosensitive body, a beam detect lens to converge or disperse the laser beam reflected from the reflective mirror, and a printed circuit board having a photo diode sensor to detect the laser beam passed through the beam detect lens, generating a synchronizing signal to synchronize a starting point of an image formation of the electrostatic latent image. The apparatus to detect the synchronizing signal also includes a fixing part to secure the beam detect lens on the printed circuit board so that a center of an optical axis of the beam detect lens is aligned with a detection area of the photo diode sensor. Alternatively, the beam detect lens and the photo diode sensor may be integrally formed with each other. As a result, deterioration of printing quality due to errors from part allowance and an assembling process is prevented. Also, since a number of parts is reduced, the assembling process becomes simpler and fabrication costs decrease.

Description

[0001] related application [0002] This application claims the benefit of Korean Patent Application No. 2002-34686 filed with the Korean Intellectual Property Office on June 22, 2002, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to an optical scanning device used in an image forming device such as a printer, a facsimile machine, a copying machine, etc., and more particularly, to a synchronizing signal detection device of an optical scanning device, the size and assembly deviation of the components of the detection device being within the The manufacturing and assembly process of the synchronous signal detection device is minimal. Background technique [0004] Generally, optical scanning devices of image forming devices such as printers, facsimiles, and copiers use light sources capable of generating light flux such as laser beams to form electrostatic latent images on photosensitive bodies such as photos...

AI Technical Summary

Problems solved by technology

[0016] When errors occur in the manufacturing and assembly process, the center of the optical axis of the beam detection lens 9 is difficult to align with the detection area of ​​the photodiode sensor 11

Therefore, as the laser beam 14 is irregularly incident on the photodiode sensor 11, the detection position of the synchronization signal varies, and as a result, stable printing quality cannot be ensured.

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