JPS6349780A - Adjusting mechanism for focus position of optical print head - Google Patents

Abstract

PURPOSE:To easily and finely adjust the distance between an optical print head and a photosensitive body by providing a link block which deforms elastically with an adjusting screw to vary the height to a guide roller. CONSTITUTION:The print head 1 is moved freely by a shaft 6 at right angles to the photosensitive body 4 and pressed by a spring 5 toward the photosensitive body 4. The distance between this photosensitive body 4 and a SELFOC lens array 3 is determined by the guide roller 2 that the head 1 has. Then, the link block 10 is deformed elastically with the screw 11 at the time of device assembly. This block 10 holds the roller 2 and the distance between the photosensitive body 4 and SELFOC lens array 3 varies by the elastic deformation. Thus, the guide roller 2 for finding the focus length to the photosensitive body 4 is fitted on the side of the head 1 and even when the head 1 of the main printer device is replaced, a head which is already adjusted need not be adjusted again.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electrophotographic printers, and more particularly to an optical printhead focus position adjustment mechanism for overwriting print information on a photoreceptor.

[Conventional technology]

Conventionally, this type of original print head is positioned entirely by placing a reference metal on the frame of the device, but even if it has seven guide rollers, it is still possible to position the print head with precision.

[Problems that the invention attempts to solve]

The above-mentioned conventional method has the disadvantage that when attempting to focus z5 light onto a bright lens with a shallow depth of focus, the focal position varies.

[Means for solving problems]

The optical print head focus position adjustment mechanism of the present invention includes a next guide roller that is taken as a reference from the surface of the photoconductor, an adjustment screw that can adjust the surface of the surface opposite to the photoconductor, and a guide roller that holds and adjusts the surface of the photoconductor. The guide roller includes a link block that is elastically deformed by a screw to change the height of the guide roller.

Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an example of the disease yield of the electrophotographic printer according to the present invention. The optical print head is mounted on a shaft 6 and is freely movable in a direction perpendicular to the photoreceptor 4, and is urged toward the photoreceptor by a spring 5. Photoreceptor 4 and SELFOC lens array 3
The distance between the optical print head 1 and the guide roller 2 is determined by adjusting the guide roller 2 of the optical print head 1.

FIG. 2(a) shows an example of the configuration of an optical print head according to the present invention. Immediately after assembling the optical print head, the link block 10 shown in this figure is not elastically deformed, but the link block 10 shown in Fig. 2 (
As shown in b), when assembling the device, the 10 link blocks are elastically deformed using the adjustment screws 11. link block 1
0, two guide rollers are held, and the distance between the photoreceptor and the SELFOC lens array 3 changes due to elastic deformation of the link block 10.

〔Effect of the invention〕

As explained above, in the present invention, nine guide rollers are attached to the optical print head side to determine the focal length with respect to the photoreceptor, and even if seven optical print heads are replaced in the printer IT body, the already adjusted head If so, there is no need for readjustment.

The adjustment screw is adjusted from the opposite side of the optical print head to the photoreceptor, and can be mounted on the printing device to make fine adjustments to the entire focal position while viewing the actual grid/grit results.

[Brief explanation of drawings]

Fig. 1 is a front view of the electrophotographic printer according to the present invention, Fig. 2 (a) Machining (b) H1 A-A before and after adjustment in Fig. 1
FIG.

Claims (1)

[Claims] a guide roller for taking a reference from the surface of the photoreceptor;
An optical print head characterized by having an adjustment screw that can be adjusted from a surface opposite to a surface relative to a photoreceptor, and a link block that holds a guide roller and is elastically deformed by the adjustment screw to change the height of the guide roller. Focus position adjustment mechanism.