JP2007292945A - Optical scanner and image forming apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical scanner in which the summit of the curvature and the degree of curvature of a turning back mirror are accurately and easily adjusted and the curvature of the scanning line of a light beam is surely corrected, and to provide an image forming apparatus having the optical scanner. <P>SOLUTION: The position of the summit of the curvature is decided by sliding a second bracket 42 in the longitudinal direction of the final turning back mirror 25a, and the degree of curvature of the final turning back mirror 25a is adjusted by pressing the final turning back mirror 25a with a pressing adjustment screw 46 or pulling the final turning back mirror 25a with a pawl 41c of a first bracket 41, thus the curvature of the scanning line of the reflected light beam is surely corrected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical scanning apparatus that scans a light beam used in an image forming apparatus such as a printer, a facsimile machine, and a copying machine to write and form an image.

  2. Description of the Related Art Conventionally, in an image forming apparatus using an electrophotographic system such as a copying machine or a printer, optical scanning that scans a surface of a photosensitive drum uniformly charged by a charging unit with a light beam modulated based on input image data. An electrostatic latent image formed by the optical scanning device is developed into a toner image by a developing unit, and image formation is performed by transferring the toner image onto a recording sheet or the like. Yes.

  By the way, in recent years, with the speeding up of the color image forming apparatus, a plurality of photosensitive drums are arranged in the conveyance direction of the recording paper, and a plurality of optical scanning devices corresponding to the respective photosensitive drums are simultaneously exposed to static. After creating electrostatic latent images and developing these electrostatic latent images with developing means using different color developers such as black, magenta, cyan, yellow, etc., these toner images are sequentially superimposed on the same recording paper. Digital copiers and laser printers employing the so-called tandem method, which transfer together and obtain color images, have been put into practical use.

  In an image forming apparatus employing such a tandem method, a plurality of folding mirrors are arranged as reflecting means in the optical scanning device, so that a light beam is guided to each photosensitive drum. These folding mirrors improve the surface accuracy by polishing the reflecting surface so that the reflected light beam will not be distorted, but the folding mirror does not interfere with the optical path of the light beam at both ends. Since the folding mirror may be bent by its own weight, the scanning line of the reflected light beam may be bent, and if the scanning line of each light beam has a different size, it will be formed. There has been a problem that the color image produced has a color shift due to the shift of the scanning line.

Therefore, in Patent Document 1, the reflection surface side of the folding mirror is supported by a pair of brackets, and the back surfaces of both ends protruding outward from the bracket of the folding mirror are supported by adjusting screws, respectively, and reflected by the folding mirror. When the scanning line of the light beam is curved, both ends of the folding mirror are pressed from the back with two adjusting screws to adjust the bending vertex and the degree of bending of the folding mirror, An optical scanning device capable of correcting the curvature of the scanning line has been proposed.
JP 2001-1117040 A

  However, in the optical scanning device described in Patent Document 1, the apex of the bending of the folding mirror is changed by adjusting the pressing force of the adjusting screw that presses both ends of the folding mirror from the back surface, and the degree of bending is adjusted. However, it is very difficult to accurately adjust the degree of bending by accurately changing the vertex of the bending of the folding mirror only by adjusting the pressing force at both ends.

  In the present invention, in view of the above-described circumstances, it is possible to accurately and easily change the bending vertex of the folding mirror and adjust the degree of bending, and to reliably correct the curvature of the scanning line of the reflected light beam. An object of the present invention is to provide an optical scanning device capable of performing the above and an image forming apparatus including the same.

  In order to achieve the above object, the present invention provides a light source that emits a light beam, a deflector that deflects the light beam emitted from the light source, and a surface of a photoconductor by folding back the light beam deflected by the deflector. And at least one of the reflecting means includes a holding member engaged with the reflecting means, and a mounting surface to which the holding member is attached. And a deflection adjusting mechanism comprising a pressing means and a pulling means capable of pressing and pulling the reflecting means in a direction perpendicular to the reflecting surface, and the holding member is slidable in the longitudinal direction of the reflecting means It is characterized by being attached to.

  According to the present invention, in the optical scanning device having the above-described configuration, a plurality of positioning holes are provided in parallel in the longitudinal direction of the reflecting means on the mounting surface, and a fixing screw is passed through any of the positioning holes. The holding member is positioned by being screwed into a screw hole provided in the holding member.

  According to the present invention, in the optical scanning device having the above-described configuration, the holding member includes a first holding member that is slidably engaged in a longitudinal direction of the reflecting means, and the first holding member is connected to the reflecting means. And a second holding member that is slidably held in a direction perpendicular to the reflecting surface.

  According to the present invention, in the optical scanning device having the above-described configuration, the tension means is a tension adjusting screw that adjusts an interval between the first and second holding members, and the pressing means is provided on the first holding member. It is a pressure adjusting screw that is screwed and presses the back surface of the reflecting means.

  According to the present invention, in the optical scanning device having the above-described configuration, the deflection adjusting mechanism is engaged with a final reflecting means disposed immediately before the photoconductor among the reflecting means.

  The present invention also provides an image forming apparatus including the optical scanning device having the above-described configuration.

  According to the first configuration of the present invention, the reflecting surface of the pulling and reflecting means can be bent into a convex shape or a concave shape by the deflection adjusting mechanism, and the holding member attached to the reflecting means is the reflecting means. Since the vertex of the deflection of the reflecting means can be changed by sliding in the longitudinal direction, the curvature of the scanning line of the reflected light beam can be reliably corrected.

  According to the second configuration of the present invention, in the optical scanning device of the first configuration, the fixing screw is passed through any one of the plurality of positioning holes provided in the mounting surface and screwed into the holding member. Since the holding member is positioned by the positioning means, if the position of the apex obtained for each positioning hole is determined, the position of the apex of the curve can be adjusted by selecting a predetermined positioning hole. It is possible to adjust the apex of the curvature of the reflecting surface.

  Further, according to the third configuration of the present invention, in the optical operation device having the first or second configuration, the holding member that constitutes the deflection adjusting mechanism may be the first holding member that is engaged with the reflecting means. By constructing from the two types of members of the second holding member fixed to the mounting surface, the assembling work of the deflection adjusting mechanism can be easily performed.

  Further, according to the fourth configuration of the present invention, in the optical scanning device of the third configuration, the first and the adjustment screws that are screwed into the first holding member that is the pressing unit, or the first and the first that are the pulling unit. Since the pressing force or tensile force applied to the reflecting means can be adjusted by rotating the tension adjusting screw that adjusts the distance between the second holding members, the degree of curvature of the reflecting surface of the reflecting means can be easily adjusted. Can do.

  According to the fifth configuration of the invention, in the optical scanning device having any one of the first to fourth configurations, the vertex of the curve of the reflecting surface of the final reflecting means is changed and the degree of curve is adjusted. Therefore, the curvature of the scanning line of the light beam generated by the reflecting means and the lens provided between the light source and the photosensitive member can be corrected at the same time.

  According to the sixth configuration of the present invention, since the optical scanning device having any one of the first to fifth configurations can be mounted, the curvature of the scanning line of the light beam can be corrected. It is possible to prevent the image quality from being deteriorated due to the curvature of the scanning line of the beam, and in particular, in a color image forming apparatus using a plurality of scanning lines, it is possible to prevent color misregistration due to the difference in the curvature of the scanning lines.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an image forming apparatus provided with the optical scanning device of the present invention. Here, a 4-drum tandem type color image forming apparatus is shown. FIG. 2 is a schematic configuration diagram showing the configuration of the optical scanning device. For convenience of explanation, the photosensitive drums 15 </ b> K to 15 </ b> Y disposed in each image forming unit are illustrated.

  A paper feed unit 2 such as a paper feed cassette that accommodates a stack of stacked paper is provided below the color image forming apparatus 1. At one end portion of the paper feeding unit 2, a separation feeding unit 3 for feeding the stacked paper P one by one from the uppermost paper is provided. A sheet conveying path 5 extending upward and reaching the discharge tray 4 formed on the upper surface of the main body is formed at the upper part of the separating and feeding means 3. A separating and feeding means 3, a conveying roller pair 6, a registration roller pair 7, a transfer roller 8, a fixing roller pair 9, and a paper discharge roller pair 10 are arranged along the paper conveying path 5 in order from the upstream in the paper conveying direction. Yes.

  An intermediate transfer belt 11 is rotatably disposed on the right side of the transfer roller 8. The intermediate transfer belt 11 is stretched between a driving roller 12 and a driven roller 13, and is rotated clockwise when the driving roller 12 is driven to rotate. The drive roller 12 is in contact with the transfer roller 8 via the intermediate transfer belt 11. In addition, a sheet made of dielectric resin is used for the intermediate transfer belt 11, and a belt in which both ends thereof are overlapped and joined to each other to form an endless shape or a seamless belt (seamless) is preferably used.

  Below the intermediate transfer belt 11, four image forming units 14K, 14C, 14M, and 14Y are arranged along the rotational direction in order from the right side in FIG. These image forming units 14K to 14Y are provided corresponding to images of four different colors (black, cyan, magenta, and yellow), and black, cyan, magenta are respectively obtained by charging, exposure, development, and transfer processes. And yellow images are sequentially formed.

  These image forming units 14K to 14Y are provided with photosensitive drums 15K, 15C, 15M, and 15Y that carry visible images (toner images) of the respective colors, and the photosensitive drums that are rotatably arranged. Around 15K to 15Y, the charger 16 for charging the photosensitive drums 15K to 15Y, the developing unit 17 for forming a toner image on the photosensitive drums 15K to 15Y, and the residual on the photosensitive drums 15K to 15Y. A cleaning unit 18 that removes the developer, and an intermediate transfer roller 19 that contacts the photosensitive drums 15K to 15Y via the intermediate transfer belt 11, are arranged, and further below the photosensitive drums 15K to 15Y. An optical scanning device 20 that exposes image information is disposed on the body drums 15K to 15Y.

  Here, the optical scanning device 20 will be further described with reference to FIG. The optical scanning device 20 includes a light source (not shown) that emits a light beam 21 modulated based on an image signal, a polygon mirror 22, an fθ lens 23, a correction lens 24, and folding mirrors 25, 26 installed in each optical path. 27 and 28.

  The optical scanning device 20 is provided with four light sources (not shown), which emit light beams 21K, 21C, 21M and 21Y modulated based on black, cyan, magenta and yellow image signals, respectively. is there. The polygon mirror 22 is a light beam deflecting unit, and is rotatably disposed in the optical scanning device 20. The polygon mirror 22 rotates about a rotating shaft 22a, thereby causing the light beams 21K to 21K incident on the reflecting surface. 21Y can be deflected at a constant angular velocity.

  The fθ lens 23 deflects the light beam 21 that is deflected at a constant angular velocity by the polygon mirror 22 so that the light beams 21K to 21Y that scan the surface of each photosensitive drum 15 scan at a constant speed in the main scanning direction. It is something to be made. The correction lens 24 is a means for correcting the light beam 21, and the light beam 21 deflected by the polygon mirror 22 corrects an error caused by a surface tilt that causes the reflection surface of the polygon mirror 22 to tilt with respect to the rotation shaft 22a. It has a function.

  The folding mirrors 25, 26, 27, and 28 are reflecting means installed in the optical paths of the respective light beams 21K to 21Y, and are constituted by thin plate-like mirrors. 30 (see FIG. 3), and is disposed at a predetermined position in the optical scanning device 20. In addition, the number of the folding mirrors 25-28 arrange | positioned in each optical path and the installation angle of a reflective surface can be changed suitably.

  Here, since the folding mirrors 25 to 28 disposed in the optical scanning device 20 are held only at both ends in the longitudinal direction, the reflecting surface may bend due to bending due to its own weight, and in this case, the reflection is reflected. Since the light beam 21 has a color shift in the color image formed by the scanning line being curved, the final folding mirrors 25a, 26a, 27a and 28a arranged immediately before the photosensitive drum 15 in all the optical paths will be described later. A deflection adjusting mechanism 40 is provided so that the deflection can be adjusted.

  An image forming operation by the color image forming apparatus 1 configured as described above will be described. When the start of image formation is input by the user, first, the surfaces of the photosensitive drums 15K to 15Y are uniformly charged and input by the charger 16 by rotationally driving the photosensitive drums 15K to 15Y. A light beam is irradiated by the optical scanning device 20 based on the image signal, and an electrostatic latent image corresponding to the image signal is formed on each of the photosensitive drums 15K to 15Y.

  Here, the light beam scanning operation by the optical scanning device 20 will be described. Light beams 21 </ b> K to 21 </ b> Y are incident on the reflecting surface of the polygon mirror 22 from four light sources (not shown) provided in the optical scanning device 20. At this time, in order to facilitate the optical path separation of the four light beams 21K to 21Y deflected by the polygon mirror 22, these light beams 21K to 21Y are incident on the polygon mirror 22 at different angles in the sub-scanning direction. Is configured to do.

  The light beams 21 </ b> K to 21 </ b> Y incident on the polygon mirror 22 are deflected at a constant angular velocity by the polygon mirror 22 and then deflected at a constant velocity by the fθ lens 23. Then, the light beams 21K to 21Y deflected at the same speed are folded a predetermined number of times by folding mirrors 25 to 28 as reflecting means arranged in the respective optical paths, and are subjected to face tilt correction by passing through the correction lens 24. Thereafter, the light is folded back by final folding mirrors 25a to 28a provided at the end of the optical path, and light is distributed to the surfaces of the photosensitive drums 15K to 15Y.

  Next, developers of black, cyan, magenta, and yellow are supplied to the photosensitive drums 15K to 15Y from a replenishing device (not shown) to the developing unit 17, and a toner image corresponding to the electrostatic latent image is formed. After an electric field is applied to the intermediate transfer belt 11 with a predetermined transfer voltage, black, cyan, magenta and yellow toner images on the photosensitive drums 15K to 15Y are transferred onto the intermediate transfer belt 11 by the intermediate transfer roller 19. . These four color images are formed with a predetermined positional relationship predetermined for forming a predetermined full-color image. The developer remaining on the surfaces of the photosensitive drums 15K to 15Y is removed by the cleaning unit 18 in preparation for the subsequent formation of a new electrostatic latent image.

  Further, when the intermediate transfer belt 11 starts to rotate clockwise as the drive roller 12 is rotated by a drive motor (not shown), the sheet P is adjacent to the intermediate transfer belt 11 from the registration roller pair 7 at a predetermined timing. The full color image is transferred to the paper P by being conveyed to the provided transfer roller 8. Then, the paper P onto which the toner image has been transferred is conveyed to the fixing roller pair 9 and heated and pressed by the fixing roller pair 9 to fix the toner image on the surface of the paper P, thereby forming a predetermined full color image. . The paper P on which the full color image is formed is discharged to the discharge tray 4 by the discharge roller pair 10.

  Next, the deflection adjusting mechanism 40 provided in the final folding mirrors 25a to 28a arranged in the optical scanning device 20 will be described with reference to FIGS. 3 is a perspective view of the deflection adjusting mechanism as viewed from the side of the folding mirror, FIG. 4 is a perspective view of the deflection adjusting mechanism as viewed from the side opposite to FIG. 3, and FIG. 5 is an exploded perspective view of the deflection adjusting mechanism. Here, FIGS. 3 to 5 show only the deflection adjusting mechanism provided in the final folding mirror 25a arranged in the optical path of the light beam corresponding to black, but this is the other final folding mirror 26a, 27a. Also, since the bend adjustment mechanism provided in 28 and 28a has the same configuration, the illustration is omitted and the description is not repeated.

  As shown in FIGS. 3 and 4, the final folding mirror 25 a is mounted at both ends in the longitudinal direction on the holding table 29 fixed in the optical scanning device 20, and both ends in the longitudinal direction are pressed against the holding table 29 by the fixing spring 30. The bending adjustment mechanism 40 includes a first bracket 41 that is engaged with the final folding mirror 25a, a second bracket 42 that holds the first bracket 41, and a support plate 43 to which the second bracket 42 is fixed. It is composed of

  The first bracket 41 is formed in a substantially U shape by integrally forming arm portions 41b extending vertically downward with respect to the base portion 41a at both ends in the longitudinal direction of the base portion 41a formed of a rectangular plate member. The distance between the two opposing arm portions 41b is slightly longer than the short side length of the final folding mirror 25a, and the final folding is performed from the back side of the reflecting surface so that both sides of the final folding mirror 25a are sandwiched by these arm portions 41b. It is engaged with the mirror 25a and is slidable in the longitudinal direction of the final folding mirror 25a.

  Further, both arms 41b formed on the first bracket 41 are provided with hooking claws 41c bent at the front ends thereof at substantially right angles. As will be described later, the first bracket 41 is located on the second bracket 42 side. When slid, the hooking claws 41c come into contact with the reflecting surface of the final folding mirror 25a. The catching claw 41c is formed so as to abut only on the vicinity of both side edges of the reflecting surface so as not to disturb the optical path of the light beam.

  Furthermore, two screw holes 44 and 45 aligned in the short direction are formed perpendicularly to the base 41 a at the center in the longitudinal direction of the base 41 a of the first bracket 41. A tension adjusting screw 47 is screwed into the other screw hole 45 via a second bracket 42 described later. A set screw is preferably used for the pressure adjusting screw 46. Furthermore, the base portion 41a is provided with two sliding shafts 48 extending vertically upward with respect to the base portion 41a, and these two sliding shafts 48 are arranged in the longitudinal direction with the screw hole 45 interposed therebetween. It is installed.

  In the second bracket 42, a holding portion 42a for holding the first bracket 41 and a fixing portion 42b fixed to the support plate 43 are integrally formed, and an insertion hole 49 is formed in the holding portion 42a. The first bracket 41 is held by the second bracket 42 by screwing the tension adjusting screw 47 into the screw hole 45 provided in the first bracket 41 through the insertion hole 49.

  The holding portion 42 a is provided with a guide hole 50 at a position facing the slide shaft 48 formed in the first bracket 41, and the slide shaft 48 is inserted into the guide hole 50. The insertion hole 49 and the guide hole 50 are formed so as to be perpendicular to the reflection surface of the final folding mirror 25a. When the tension adjusting screw 47 is rotated, the first bracket 41 reflects the reflection of the final folding mirror 25a. It slides in a direction perpendicular to the surface.

  The fixing portion 42 b is provided with a screw hole 51, and the support plate 43 is provided with a positioning hole 52 at a height corresponding to the screw hole 51, and the fixing screw 53 is inserted through the positioning hole 52 into the screw hole 51. The second bracket 42 is fixed to the support plate 43 by being screwed to the support plate 43. A plurality of positioning holes 52 are arranged in the longitudinal direction of the final folding mirror 25a. By changing the positioning holes 52 through which the fixing screws 53 are passed, the position where the second bracket 42 is fixed is changed to the longitudinal direction of the final folding mirror 25a. Can be changed in direction.

  With reference to FIG.6 and FIG.7, the bending adjustment of the final folding mirror 25a using a bending adjustment mechanism is demonstrated. Here, the bending adjustment is to correct the bending of the final folding mirror 25a. However, in FIGS. 6 and 7, the final folding mirror 25a is illustrated as not originally bent for convenience of explanation.

  FIG. 6 is a side view of the deflection adjusting mechanism, and FIG. 7 is a cross-sectional view of the final folding mirror cut in the longitudinal direction along a plane including the center of the pressure adjusting screw and the tension adjusting screw. In each of the drawings, (a) is a state where the pressure adjusting screw and the hooking claw are not in contact with the final folding mirror, (b) is a state where the pressure adjusting screw is screwed and the final folding mirror is pressed, and (c) is the first bracket. The state which made it slide to the 2nd bracket side and pulled the last folding mirror with the hooking claw is illustrated.

  When adjusting the deflection of the final folding mirror 25a using the deflection adjustment mechanism, first, the position of the bending point of the final folding mirror 25a is determined, and the first bracket 41 and the second bracket 42 are moved to the final folding mirror 25a. The second bracket 42 is fixed to the support plate 43 by the fixing screw 53 after adjusting the pressing adjustment screw 46 or the hooking claw 41c to face each other at the apex position.

  Here, as shown in FIG. 6A, when the pressing force by the pressing adjusting screw 46 or the tensile force by the catching claw 41c is not applied, the final folding mirror 25a is bent as shown in FIG. Not. Then, as shown in FIG. 6B, when the pressure adjusting screw 46 is rotated and screwed into the first bracket 41, the tip of the pressure adjusting screw 46 presses the back surface of the final folding mirror 25a. As described above, since both ends in the longitudinal direction of the final folding mirror 25a are fixed by the holding base 29 and the fixing spring 30, the final folding mirror 25a is in contact with the pressure adjusting screw 46 as shown in FIG. It will bend so that a reflective surface may become convex shape with a portion as a vertex.

  As shown in FIG. 6C, when the pressing adjustment screw 46 is rotated and the first bracket 41 is slid toward the second bracket 42, the hooking claw 41c formed on the first bracket 41 is finally reached. It comes into contact with the reflecting surface of the folding mirror 25a and pulls the final folding mirror 25a toward the first bracket 41 side. At this time, since both ends in the longitudinal direction of the final folding mirror 25a are fixed as described above, the final folding mirror 25a is reflected with the contact portion with the hooking claw 41c as a vertex as shown in FIG. 7C. The surface will be bent so as to have a concave shape.

  It should be noted that the pressing force or tensile force applied to the final folding mirror 25a can be adjusted by adjusting the amount of rotation of the pressing adjusting screw 46 and the tension adjusting screw 47, whereby the degree of curvature of the final folding mirror 25a. Can be changed. In addition, by installing a plurality of first brackets 41 and second brackets 42, the curvature of the final folding mirror 25a can be adjusted more accurately.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the curvature of the scanning line of the light beam 21 is corrected by adjusting the deflection of the final folding mirrors 25a to 28a disposed immediately before the photosensitive drum 15 in all the optical paths. The deflections of the other folding mirrors 25 to 28 may be adjusted instead of the final folding mirrors 25a to 28a, and the deflections of the plurality of folding mirrors 25 to 28 may be adjusted.

  Further, different means are used when the reflecting surface of the final folding mirror 25a is bent into a convex shape and when it is bent into a concave shape, but this can press the back surface of the final folding mirror 25a with the first bracket 41. In this way, it is possible to bend the reflecting surface of the final folding mirror 25a to a convex shape or a concave shape with only the tension adjusting screw 47.

  The positioning of the second bracket 42 is performed by changing the positioning hole 52 through which the fixing screw 53 is passed. This is achieved by providing a gear on the second bracket 42 and a rack on the support plate 43, respectively. The second bracket 42 may be slid by rotationally driving the gear, and a motor is also connected to the press adjusting screw 46 and the tension adjusting screw 47, and a control device for controlling these motors is provided. The vertex and the degree of bending of the folding mirrors 25 to 28 may be automatically adjusted.

  Further, the second bracket 42 is fixed to the support plate 43 provided with a plurality of positioning holes 52. This is because the positioning holes 52 are provided in the housing of the optical scanning device 20, and the second bracket 42 is attached to the optical scanning device. The support plate 43 can be omitted by fixing directly to the 20 housings. When a plurality of positioning holes 52 are provided in the housing of the optical scanning device 20, the other positioning holes 52 that are not used for fixing the second bracket 42 are made of tape or the like for dust prevention of the optical scanning device 20. It is preferable to close it.

  Further, in the above-described embodiment, the deflection of the final folding mirror 25a is adjusted using two types of members, the first bracket 41 engaged with the final folding mirror 25a and the second bracket 42 fixed to the support plate 43. The positioning hole 52 provided in the support plate 43 is formed so as to be perpendicular to the reflecting surface of the final folding mirror 25a, and the first bracket 41 is formed in the positioning hole 52. It is also possible to insert the sliding shaft 48 and directly attach the first bracket 41 to the support plate 43 so that the first bracket 41 can slide in the direction perpendicular to the reflecting surface of the final folding mirror 25a.

  Furthermore, in the above-described embodiment, the image forming apparatus using four color developers of yellow, magenta, cyan, and black has been described in order to obtain a full color image. However, an image including a color material having a different hue is described. The present invention can be used for a forming apparatus, an image forming apparatus having a different number of colors, and a monochrome image forming apparatus.

  INDUSTRIAL APPLICABILITY The present invention can be used in an optical scanning apparatus that scans a light beam provided in an image forming apparatus such as a printer, a facsimile machine, and a copying machine to write and form an image. In particular, such as a color laser printer and a digital color copying machine. It can be suitably used for an optical scanning device provided in a color image forming apparatus.

FIG. 1 is a schematic configuration diagram of an image forming apparatus including an optical scanning device according to the present invention. These are schematic block diagrams which show the structure of an optical scanning device. FIG. 5 is a perspective view of the deflection adjusting mechanism viewed from the folding mirror side. FIG. 4 is a perspective view of the deflection adjusting mechanism as viewed from the opposite side to FIG. 3. FIG. 3 is an exploded perspective view of a deflection adjusting mechanism. [Fig. 11] is a side view of a deflection adjusting mechanism. FIG. 5 is a cross-sectional view of the final folding mirror cut in the longitudinal direction by a plane including the center of the pressure adjusting screw and the tension adjusting screw.

Explanation of symbols

1 Color image forming apparatus 25, 26, 27, 28 Folding mirror (reflection means)
25a, 26a, 27a, 28a Final folding mirror (final reflecting means)
29 Holding stand 30 Fixing spring 40 Deflection adjusting mechanism 41 First bracket (first holding member)
41a base part 41b arm part 41c hooking claw 42 second bracket (second holding member)
42a Holding part 42b Fixing part 43 Support plate (mounting surface)
44, 45 Screw hole 46 Press adjusting screw (pressing means)
47 Tension adjusting screw (Tensile means)
48 Slide shaft 49 Insertion hole 50 Guide hole 51 Screw hole 52 Positioning hole 53 Fixing screw

Claims (6)

A light source that emits a light beam, a deflector that deflects the light beam emitted from the light source, and one or more reflecting means that folds the light beam deflected by the deflector and guides it to the surface of the photoreceptor; In an optical scanning device comprising:
At least one of the reflecting means includes a holding member engaged with the reflecting means, a mounting surface to which the holding member is attached, and a press capable of pressing and pulling the reflecting means in a direction perpendicular to the reflecting surface. A deflection adjusting mechanism comprising a means and a tension means,
The optical scanning device, wherein the holding member is slidably engaged in the longitudinal direction of the reflecting means.   A plurality of positioning holes are juxtaposed in the longitudinal direction of the reflecting means on the mounting surface, and a fixing screw is passed through any of the positioning holes and screwed into a screw hole provided in the holding member. The optical scanning device according to claim 1, wherein the holding member is positioned by the positioning.   The holding member is slidably engaged in the longitudinal direction of the reflecting means, and the first holding member is slidable in a direction perpendicular to the reflecting surface of the reflecting means. The optical scanning device according to claim 1, further comprising a second holding member that holds the optical scanning device.   The tension means is a tension adjustment screw that adjusts the distance between the first and second holding members, and the pressing means is a pressure adjustment that is screwed into the first holding member and presses the back surface of the reflecting means. The optical scanning device according to claim 3, wherein the optical scanning device is a screw.   5. The optical scanning according to claim 1, wherein the deflection adjusting mechanism is engaged with a final reflecting unit disposed immediately before the photoconductor in the reflecting unit. apparatus.   An image forming apparatus comprising the optical scanning device according to claim 1.

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