Optical scanner for image forming apparatus

Abstract

An optical scanner for an image forming apparatus has a housing having a wall surface provided with a through-hole, and an optical scanning unit, which is provided within the housing, scans light on an object to be scanned in order to form an image on the object to be scanned, and includes: a polygon motor; a polygon mirror that reflects the light while being rotated by a driving force of the polygon motor; a mirror member that reflects the light reflected by the polygon mirror, toward a target object; and a mirror holding member that is attached to the wall surface of the housing and holds the mirror member. The mirror holding member has a heat radiation part that is exposed to the outside of the housing through the through-hole. Thereby, heat radiation of the mirror holding member is prevented, and position shift of the mirror holding member caused by the heat radiation is prevented, and then the optical scanner can proceed normal function.

Description

technical field [0001] The present invention relates to an optical scanning device of an image forming device. Background technique [0002] Conventionally, an image forming apparatus such as a printer has an optical scanning unit (LSU: Laser Scanning Unit) for writing an electrostatic latent image (image) on a photosensitive drum (object to be scanned) (refer to Japanese Patent Laid-Open Publication 2002- 328321). [0003] Such an optical scanning device has in a housing: a light source for emitting laser light; a polygonal mirror for reflecting laser light emitted from the light source while rotating; a polygonal mirror motor for driving the polygonal mirror to rotate; and an optical system for turning the polygonal mirror The laser light reflected by the multi-faceted mirror is guided to the lens and mirror on the photosensitive drum. Then, the laser light reflected by the polygon mirror is guided onto the photosensitive drum through the optical system, and the photosen...

AI Technical Summary

Problems solved by technology

Therefore, when the member supporting the mirror is thermally deformed, the optical path of the reflected light is shifted, and the optical scanning device may not function normally.

[0006] For example, when the supporting member supporting the light guide mirror is thermally deformed and the optical path of the light reflected by the light guide mirror deviates, the laser light cannot be correctly incident on the light receiving element of the substrate, so it is difficult to accurately Controls where the image is written on the photosensitive drum

As a result, the position on the photosensitive drum after the image is written deviates from the original position, so-called image shift occurs, and the image quality deteriorates.

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