KR970075956A - Optical scanning device - Google Patents

Abstract

In particular, the present invention relates to an optical scanning device, and more particularly, to an optical scanning device in which optical path changing means for diverging and reflecting an incident light beam is provided between a lens unit and a photodetector for detecting a scanning start synchronization signal, In order to facilitate the operation of the optical scanning device.

The light beam emitted from the light source is deflected by the deflecting means, the deflected light beam passes through the lens unit and is scanned on the photosensitive surface, and the selected one of the Lemz units configured to focus on the photosensitive surface by the convex mirror, The focal distance of the light beam passing through the portion is extended longer, thereby facilitating the arrangement of the photodetector for detecting the scanning start synchronization signal. That is, it is possible to provide a flexible optical mounting device in the entire system arrangement configuration.

Description

Optical scanning device

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FIG. 2 is a diagram showing the optical configuration of the optical scanning apparatus according to the present invention, FIG. 3 is a diagram showing the optical arrangement of the lens units and optical elements of the optical scanning apparatus of FIG. 2, Fig. 3 is a schematic view showing a light beam reflected by the optical path changing means; Fig.

Claims (8)

Light source; Deflecting means for deflecting the light beam generated from the light source; A lens unit for connecting a light beam passed through the deflecting unit on a photosensitive surface; A photodetector for receiving a part of the light beam passing through the lens unit; And an optical path changing means disposed between the lens unit and the photodetector for converting and reflecting the traveling path of the incident light beam. The optical scanning device according to claim 1, further comprising a cylindrical lens disposed between the light source and the deflecting means for focusing the light beam in the sub-scanning direction so that the light beam emitted from the light source becomes a light beam horizontal to the photosensitive surface . The apparatus according to claim 1, further comprising a cylindrical lens disposed between the light source and the deflecting means for focusing the light beam in a sub-scanning direction so as to become a light beam horizontally incident on the light- Optical scanning device. The image forming apparatus according to claim 1, wherein the deflecting means includes a driving motor and a rotating polygonal mirror mounted on the driving motor so as to be rotationally weighted and having a plurality of reflecting surfaces formed on a side surface thereof, . The optical scanning device according to any one of claims 1 to 4, wherein the optical path changing means is a convex mirror for diverging and reflecting the incident light beam at a predetermined angle. The optical scanning device according to any one of claims 1 to 4, wherein the optical path changing means is a cylindrical mirror adapted to diverge and reflect the incident light beam at a predetermined angle. The optical scanning device according to any one of claims 1 to 4, further comprising a slit for adjusting a light spot size formed on the optical detector on a front optical path of the photodetector. The optical scanning device according to any one of claims 1 to 4, further comprising a cylindrical lens for focusing a light beam in a sub scanning direction incident on a front optical path of the photodetector. ※ Note: It is disclosed by the contents of the first application.