KR100898878B1 - Apparatus for assembling focus lens of laser printer scanning unit - Google Patents

Abstract

The present invention relates to a laser printer, and more particularly, to an apparatus for assembling a focusing lens for a scanning unit of a laser printer, which enables the focusing lens for a scanning unit to be mounted in a laser printer to be assembled at an accurate position and posture.

The present invention includes a base portion 100 on which a laser scanning unit 10 equipped with a preassembled focus lens 6 is placed;

A photographing unit 200 installed in a straight line on the vertical portion of the focus lens to measure an irradiation deviation of the laser beam passing through the focus lens; And

Each of the base lenses in the direction perpendicular to the focus lens is disposed on both sides of the base to receive the measurement results from the photographing unit 200 while gripping end portions of the focus lenses facing each other so as to position the assembled pre-assembled focus lens. It is configured to include a pair of alignment unit 300 that is operated as.

Accordingly, the output quality of the laser printer can be improved by assembling the focus lens at all times.

Laser Printer, Focus Lens, Laser Print Scanning Unit, LSU

Description

Apparatus for assembling focus lens of laser printer scanning unit

1 is a perspective view showing a schematic configuration of a conventional laser scanning unit.

Figure 2 is an external perspective view of a focus lens assembly of the scanning unit for a laser printer according to the present invention.

Figure 3 is an external perspective view of the focus lens assembly of the scanning unit for a laser printer according to the present invention showing a state in which the photographing unit is separated.

Figure 4 is an assembled perspective view of the alignment portion constituting the present invention.

5 is a front view of FIG. 4.

Figure 6 is an exploded perspective view of the alignment portion constituting the present invention.

<Explanation of symbols for the main parts of the drawings>

100.Base 110.Transfer rail

120 Moving Stage 200

210 ... camera 300 ... alignment

310.Horizontal support 313 ... Road cylinder

314 horizontal frame 320 ...

330 Cam 340 Aligned Block

350 ... gripper 351 ... fixed gripper

352 Mobile Gripper 360 Pusher

370 ... stopper

The present invention relates to a laser printer, and more particularly, to an apparatus for assembling a focusing lens for a scanning unit of a laser printer, which enables the focusing lens for a scanning unit to be mounted in a laser printer to be assembled at an accurate position and posture.

In general, a laser printer is a device for reproducing an image image by imaging a laser beam emitted from a laser diode by a video signal of an input image on a photosensitive drum, and spraying toner on a latent image formed on the photosensitive drum and transferring it to a medium such as paper. to be.

Looking at the configuration of a conventional laser scanning unit that emits a laser beam from the laser printer to form an image on the photosensitive drum as follows.

As shown in FIG. 1, the laser scanning unit includes a laser diode 1 that emits a laser beam used as a light source, and a collimator lens 2 that makes the laser beam emitted from the laser diode 1 parallel to the optical axis. And the cylindrical lens 3 which makes the parallel light through the collimator lens 2 into the linear light in the horizontal direction with respect to the sub-scanning direction, and the linear linear light through the cylinder lens 3 in the isotropic speed. A polygun mirror 4 having a plurality of reflective surfaces to scan, a polygun mirror driving motor 5 for rotating the polygun mirror 4 at an isotropic speed, and a polygon mirror 4 having a constant negative refractive index with respect to the optical axis. F.θ lens (hereinafter referred to as " focus lens ") that polarizes light at isotropic velocity through the main scanning direction and corrects spherical aberration to focus on the scanning surface; Through An image reflecting mirror 8 for reflecting the beam vertically and forming an image on the surface of the photosensitive drum 7 as an image plane, and a horizontal synchronous mirror for reflecting the laser beam through the focus lens 6 in a horizontal direction. (9) and an optical sensor 9a for receiving the laser beam reflected from the horizontal synchronous mirror 9 and synchronizing with it.

Here, the focus lens 6 connects and polarizes the laser beam refracted at an equilinear speed in the polygon mirror 4 to correct spherical aberration, and polarizes the laser beam corrected for spherical aberration in the main scanning direction with a constant refractive index. Focus correction is performed such that the laser beam reflected by the polygon mirror 4 is equidistant from the photosensitive drum 7.

The focus lens 6 is configured in various forms according to the resolution and the scanning size. In other words, the higher the resolution of the laser printer, the more complicated the configuration becomes and the number of sheets constituting the lens increases. In recent years, the focus lens 6 may be composed of a small number of lenses having a complicated surface such as an aspheric surface for reducing material cost and simplicity of assembly.

As such, the focus lens 6 performs an important role of scanning the laser beam formed on the photosensitive drum 7 at a constant velocity so as to form the laser beam on the photosensitive drum 7 and to prevent the image from being distorted. Changes in position or posture alone can greatly reduce the quality of the printed output.

However, in the conventional focus lens 6, the focus lens 6 is inserted into the slit (not shown) provided at the assembly position, and the ultraviolet light is applied to the ultraviolet adhesive layer formed on both ends of the focus lens 6 before assembly. Since the bonding process is performed by irradiating the light at once, there is no doubt that assembly errors occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide an apparatus for assembling a focus lens of a scanning unit for a laser printer so that the focus lens of the scanning unit for a laser printer can be assembled at an accurate position.

In order to achieve the above object, the present invention provides a base portion on which a laser scanning unit equipped with a prefabricated focus lens is placed, and a vertical deviation of the focus lens and a laser beam passing through the focus lens. Position the pre-assembled focus lens by receiving the measurement result from the photographing unit while gripping the photographing part to be measured and the end portions of the focus lens which are disposed on both sides of the base part in the direction perpendicular to the focus lens. It characterized in that it comprises a pair of alignment units that are individually operated to make.

In addition, the camera is disposed on both sides and the center of the laser beam passing through the focus lens to measure the irradiation position of the laser beam, and the camera so that the recording is performed by the unit of each mirror plane of the polygon mirror mounted on the laser scanning unit It may be configured to control the operation of the control unit for calculating the irradiation deviation of the laser beam from the measured irradiation position and transfer the result to the alignment unit.

In addition, the alignment portion is provided on the horizontal support installed on one side of the horizontal support so as to be movable to the end side of the focus lens through the cam and the horizontal support installed on the upper base, the stationary motor vertically installed on the bottom of the base And a gripper for gripping a focus lens installed on the alignment block and temporarily assembled.

On the other hand, the alignment portion on one side of the pair of alignment portions is further provided with a pusher for pushing and moving one end of the focus lens, and one side of the assembly position of the focus lens is in contact with the other end of the focus lens moved by the pusher A stopper may be further provided to block movement so that the focus lens is always aligned at a predetermined position.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

Prior to the detailed description of the present invention, since the laser scanning unit to which the present invention is applied is the same as that of the conventional laser scanning unit, the detailed description thereof will be omitted. In addition, although the focus lens constituting the laser scanning unit to which the present invention is applied may be provided alone or in plural, in this embodiment, a laser scanning unit equipped with four focus lenses is illustrated and described.

As shown in FIGS. 2 and 3, the present invention provides a focus lens 6 on a base portion 100 on which a laser scanning unit 10 is placed, and a slit 11 formed in the scanning unit 10. Is inserted in the assembled state, the end of the focus lens 6 and the photographing unit 200 for measuring the deviation of the irradiation of the laser beam passing through the focus lens 6 by passing the laser beam through the focus lens 6 It is composed of a pair of alignment unit 300 that is individually operated to receive the measurement results from the photographing unit 200 in the gripped state to position the pre-assembled focus lens 6 in place.

In the center of the base portion 100 is a transfer rail 110 for transferring the laser scanning unit 10 transferred from the previous process to the center of the base portion 100 and receiving power from the outside the transfer rail 110 The moving stage 120 that moves along is installed.

The photographing unit 200 is disposed at a work position in the center of the base unit 100. The photographing unit 200 is installed in a straight line on the vertical portion of the focus lens 6 to measure the irradiation position of the laser beam passing through the focus lens 6 and the laser scanning unit 10 The control unit (not shown) for controlling the operation of the camera 210 to be photographed in each mirror plane unit of the polygon mirror 4 (not shown) mounted on the.

On the other hand, the camera 210 is preferably a CCD (Charge Coupled Device) camera, it is preferable that a plurality is provided so as to be disposed on both sides and the center of the focus lens (6), respectively. This is to allow the control unit to more accurately measure the irradiation deviation of the laser beam through the positional information of the laser beam passing through each part of the focus lens 6.

The controller calculates a deviation of the laser beam based on the irradiation position measured by the camera 210 and transmits the result to the alignment unit 300.

In addition, the control unit reaches the focus lens 6 and the laser beam irradiated through the polygon mirror 4 is sequentially irradiated from the first camera to the last camera, and the photographing signal is sent to the camera 210 at the moment of irradiation. Take a picture.

On the other hand, the control unit preferably controls the operation of the camera 210 in units of mirror surfaces of the polygon mirror 4. In this case, the controller can determine whether the mirror surface is defective through the irradiation positions input in units of mirror surfaces.

The alignment unit 300 is disposed at both sides of the transfer rail 110 above the base unit 100.

As shown in FIGS. 4 to 6, the alignment part 300 is provided on the horizontal support 310 installed on the base part 100 and the stationary motor 320 installed perpendicular to the bottom of the base part 100. A cam 330 connected and horizontally rotated, an align block 340 installed at one side of the horizontal support 310 so as to be movable to an end side of the focus lens 6 through the cam 330, and the align block It is composed of a gripper 350 installed on the 340 to grip the preassembled focus lens (6).

The horizontal support 310 is installed on both sides of the transfer rail 110 of the upper base portion 100. The horizontal support 310 is provided with a pair of vertical portion 311 and the horizontal portion 312, both ends of which are supported by the vertical portion 311, respectively, which is vertically operated for each upper end of the vertical portion 311 The rod cylinder 313 is installed.

On the rod end 313a of the rod cylinders 313, a horizontal frame 314 having an open center portion is supported in a horizontal state, and is photographed through a straight bar 315 crossing the open center of the horizontal frame 314. Cameras 210 of the unit 200 are sequentially installed. The cameras 210 are installed so that their position is finely adjusted through the position adjusting device 220 installed in the straight bar 315.

Therefore, the laser scanning unit 10 is positioned vertically below the horizontal frame 314, and the camera 210 is positioned vertically above the focus lens 6 to move up and down according to the operation of the rod cylinder 313. Ascending and descending along the horizontal frame 314 accurately focuses the focus lens 6.

The support brackets 316 corresponding to each of the focus lenses 6 are fixed to the horizontal portion 312 of the horizontal support 310 so as to face one end of the focus lens 6, and the support brackets 316 are horizontal for each of the support brackets 316. The rotating cam 330 is installed. The cam 330 is horizontally rotated by receiving power from the rotation shaft of the stationary motor 320 installed perpendicular to the bottom of the base portion 100.

In addition, the support bracket 316 is provided with an alignment block 340 sliding in the longitudinal direction of the horizontal bar while being in contact with the rotating cam 330. In addition, a gripper 350 is provided on the alignment block 340 to grip the preassembled focus lens 6, and the gripper 350 is fixed to the alignment block 340 by a fixed gripper 351. ) And a moving gripper 352 moved in the longitudinal direction of the horizontal portion 312 according to the operation of the rod cylinder 353 installed on the alignment block 340.

The rodless cylinder 353 and the stationary motor 320 are individually driven according to a control signal of the photographing unit 200, and the gripping and assembling positions of the focus lens 6 are finely adjusted through this control operation. As a result, the focus lens 6 is aligned.

On the other hand, the alignment unit 300 of one side of the pair of alignment unit 300 may be further provided with a pusher 360 for pushing and moving one end of the focus lens (6). In this case, one side of the slit 11 provided at the assembly position is in contact with the other end 6a of the focus lens 6 moved by the pusher 360 so that the focus lens 6 is always aligned at a predetermined position. It is preferable that a stopper 370 is further provided to block the movement.

In addition, the ultraviolet irradiation device (H) for bonding the slit 11 to the focus lens 6, which is aligned, by irradiating ultraviolet light to the ultraviolet adhesive layer formed on both ends of the focus lens 6 in advance, the gripper 350 is provided. Each of the focus lenses 6 is disposed close to each other in a state of being spaced apart from an upper portion of the upper portion of the focus lens 6.

The process of assembling the focus lens 6 using the focus lens 6 assembling apparatus of the scanning unit 10 of the present invention configured as described above is as follows.

First, when the laser scanning unit 10 assembled in the previous process is placed on the moving stage 120, the moving stage 120 moves along the transfer rail 110 and moves the laser scanning unit 10 to the base unit 100. Move to the center of In this case, the laser scanning unit 10 is placed on the moving stage 120 so that the laser beam irradiated to the focus lens 6 is irradiated onto the vertical portion of the focus lens 6.

When the laser scanning unit 10 moves to the center of the base part 100, the movement of the moving stage 120 is stopped, and the moving gripper 352 moves according to the operation of the rodless cylinder 353 of the alignment part 300. Both ends of the focus lens 6 are gripped.

On the other hand, when the pusher 360 is provided in the alignment unit 300 on one side, the focus lens 6 is in contact with the pusher 360 until the other end of the focus lens 6 contacts the stopper 370 on the other side. One end of the can be aligned so that the focus lens 6 is positioned in the x-axis direction.

In this state, the rod cylinders 313 installed on the top of the vertical portion 311 of the horizontal support 310 are moved to the horizontal frame 314 up and down to focus on the camera 210.

When the camera 210 is in focus, the photographing preparation is completed, and a laser beam is emitted from the laser diode of the laser scanning unit 10 and irradiated to the focus lens 6 through the polygon mirror 4. The laser beam irradiated to the focus lens 6 passes through the focus lens 6 and is irradiated to the upper cameras 210. The controller of the photographing unit 200 immediately before the laser beam is irradiated to the camera 210. The photographing signal is sent to the camera 210 so that the photographing is performed instantaneously.

The controller collects and investigates data for each camera 210 to determine how far from the preset reference position based on the irradiation positions measured by the cameras 210 respectively installed at both sides and the center of the focus lens 6. Calculate the deviation.

On the other hand, when the control unit is configured to control the operation of the camera 210 to be photographed in units of the mirror surface of the polygon mirror 4, each mirror through the irradiation positions input in units of the mirror surface of the polygon mirror (4) It is also possible to determine whether there is a defect on the noodles.

The control unit individually controls the operation of each alignment unit 300 based on the obtained irradiation deviation, and independently moves the grippers 350 on both sides so that the laser beam is irradiated to a preset reference position. Adjust the position of. That is, when the controller controls the rotation direction and the rotation amount of the rotation shaft of the stationary motor 320, the y-axis of the alignment block 340 in contact with the cam 330 while controlling the rotation direction and the rotation amount of the cam 330. Direction, and as a result, the gripper 350 installed on the alignment block 340 moves in one direction of the focus lens 6 while moving in the y-axis direction together with the alignment block 340. 6) is to be adjusted.

At this time, since each of the alignment blocks 340 is controlled by the control unit individually, if the alignment blocks on both sides move at the same distance as described above, the alignment blocks 340 can be moved in the y-axis direction with respect to the focus lens 6. In addition, when the alignment block on the other side is moved while the alignment block on one side is stopped, the angle adjustment in the y-axis direction is also possible.

When the focus lens 6 is positioned in the correct position, the ultraviolet irradiation device H disposed at both ends of the focus lens 6 irradiates the ultraviolet light to the ultraviolet adhesive layer previously formed at both ends of the focus lens 6 to focus. The lens 6 is bonded to the slit 11.

After the above process, the assembly of the focus lens 6 is completed, and the laser scanning unit 10 equipped with the assembled focus lens 6 is transferred to the next process.

According to the focus lens assembling apparatus of the scanning unit for a laser printer according to the present invention configured as described above, a pair of pairs of shots in which the photographing unit measuring the irradiation deviation of the laser beam passing through the focus lens grips both ends of the focus lens. Since the focus lens can be assembled at the correct position by independently moving the inlet, the output quality of the laser printer can be improved.

In addition, by controlling the operation of the camera so that the control unit to shoot in the mirror plane unit of the polygon mirror can determine whether there is a failure for each mirror surface.

While the invention has been shown and described with respect to specific embodiments thereof, it will be understood that the invention can be variously modified and modified without departing from the spirit or scope of the invention as set forth in the following claims. It should be included in the scope of the invention.

Claims (4)

A base part on which a laser scanning unit equipped with a preassembled focus lens is placed; A photographing unit which is installed in a straight line on the vertical portion of the focus lens and measures the irradiation deviation of the laser beam passing through the focus lens; And Respectively disposed on both sides of the base part in the direction perpendicular to the focus lens, and individually operated to position the pre-assembled focus lens by receiving the result measured by the photographing part while gripping end portions of the focus lens facing each other. An apparatus for assembling a focus lens of a scanning unit for a laser printer, comprising a pair of alignment parts. The method of claim 1, The photographing unit A camera disposed at both sides and the center of the laser beam passing through the focus lens to measure the irradiation position of the laser beam; And a control unit for controlling the operation of the camera so that photographing is performed in units of mirror planes of the polygon mirror mounted on the laser scanning unit, and calculating a deviation of the laser beam from the measured irradiation position and transferring the result to the alignment unit. Focus lens assembly of the scanning unit for a laser printer, characterized in that. The method of claim 1, The alignment portion A horizontal support installed on the upper part of the base, A cam which is connected to a stationary motor vertically installed on the bottom of the base and rotates horizontally; An alignment block installed at one side of the horizontal support to move to an end side of the focus lens through the cam; An apparatus for assembling a focus lens of a scanning unit for a laser printer, characterized in that the gripper is installed on the alignment block to grip a preassembled focus lens. The method of claim 1, One side of the pair of alignment unit is further provided with a pusher for pushing and moving one end of the focus lens, One side of the focus lens assembly position further comprises a stopper for contacting the other end of the focus lens moved by the pusher and blocking the movement so that the focus lens is always aligned at a predetermined position. Focus lens assembly device.

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