JP5018816B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  In recent years, the driving frequency of the light source has increased with the increase in the speed and resolution of image recording, and it has become important to prevent leakage of unnecessary radio waves generated from the driving circuit of the light source. As a conventional optical scanning device used for exposure of a photoreceptor of an image forming apparatus, a device that suppresses the unnecessary radio wave has been proposed (for example, see Patent Document 1).

  The optical scanning device described in Patent Document 1 is formed by bending a metal plate by covering a circuit board on which a semiconductor laser is mounted, a holding member made of metal that supports the circuit board via a spacer, and covering the circuit board. And an optical box attached to the holding member.

JP 2000-249957 A

  An object of the present invention is to provide an optical scanning device and an image forming apparatus capable of suppressing unnecessary radio waves without affecting the optical characteristics of a light source.

  In order to achieve the above object, an aspect of the present invention provides the following optical scanning device and image forming apparatus.

[1] A substrate on which a light source that emits a light beam and a circuit that drives the light source are mounted, a side wall to which the substrate is attached, and an optical that scans the light beam emitted from the light source in a predetermined direction. A resin box having a bottom wall on which the system is arranged, a mounting hole is formed, a shielding member that shields electromagnetic waves generated from the substrate, and a position overlapping the bottom wall of the side wall of the box An attachment portion screwed through the attachment hole formed in the shielding member , wherein the substrate has an attachment hole, and the shielding member is formed in the shielding member. And an optical scanning device screwed to the mounting portion by tightening together with the substrate through the mounting hole formed in the substrate .

[ 2 ] The light source mounted on the substrate is a plurality of semiconductor lasers arranged on the substrate in an oblique direction with respect to the arrangement direction of the mounting holes of the substrate, and the substrate is the box of the box Two attachment holes provided on a side wall having the same inclination direction as that of the array lines of the plurality of semiconductor lasers and adjacent lines are further formed, provided on the side wall of the box, and formed on the substrate. The optical scanning device according to [ 1 ], further including two other mounting portions that are screwed through two mounting holes.

[ 3 ] The shielding member includes a seat portion in which an attachment hole is formed, and the seat portion is screwed to a frame grounded to the ground through the attachment hole formed in the seat portion. [ 2 ] The optical scanning device according to [ 2 ].

[ 4 ] An image forming apparatus including the optical scanning device according to any one of [1] to [ 3 ], which irradiates a photoconductor with a light beam modulated based on image data.

[ 5 ] The image forming apparatus according to [ 4 ], wherein the shielding member of the optical scanning device is made of a metal and includes a high voltage supply substrate disposed adjacent to the shielding member.

According to the first and fourth aspects of the invention, unnecessary radio waves can be suppressed without affecting the optical characteristics of the light source.

According to the first aspect of the present invention, the number of attachment portions can be reduced, and the configuration can be simplified.

According to the second aspect of the present invention, it is possible to suppress the displacement of the position of the semiconductor laser due to the attachment to the side wall of the substrate.

According to the invention described in claim 3 , the shielding performance of the shielding member can be enhanced.

According to the fifth aspect of the present invention, the light source can be protected from the high voltage supply substrate serving as a heat source by the metal shielding member.

FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing an appearance of the optical scanning device according to the embodiment of the present invention. FIG. 3A is a front view mainly showing an optical system of the optical scanning device according to the embodiment of the present invention. FIG. 3B is a plan view mainly showing an optical system of the optical scanning device according to the embodiment of the present invention. 4A is a view of the optical box shown in FIG. 2 viewed from the shield box side, and shows a state in which the light source drive substrate and the shield box are removed. FIG. 4B is a view of the semiconductor laser and the boss. It is a figure which shows a positional relationship. FIG. 5 is a view of the optical box shown in FIG. 2 as viewed from the shield box side, and shows a state in which the shield box is removed. 6 is a cross-sectional view taken along line AA in FIG. FIG. 7 is a cross-sectional view illustrating a configuration according to Comparative Example 1. FIG. 8 is a cross-sectional view illustrating a configuration according to the second comparative example. FIG. 9 is a view illustrating a seat portion of the shield box according to the first modification. FIG. 10 is a cross-sectional view illustrating a configuration according to the second modification. 11A and 11B show a configuration according to Modification Example 3. FIG. 11A is a perspective view and FIG. 11B is a cross-sectional view.

  FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention. The image forming apparatus 10 is, for example, a digital color printer, and performs image processing on an image data transmitted from a host device such as a personal computer by an image processing unit (not shown) to provide yellow (Y), magenta (M), and cyan. (C) After converting into image data of each color of black (K), a color image is formed on a sheet based on the image data of each color. Note that the image forming apparatus 10 may be a copier, a facsimile machine, or a multi-function machine having a plurality of functions such as a copier, a printer, a scanner, and a facsimile machine.

  The image forming apparatus 10 includes a substantially box-shaped housing 11, and a paper feed tray 12 that accommodates a sheet P as a recording medium is detachably provided in a lower portion of the housing 11. A paper discharge section 13 for discharging the recorded paper P is disposed at the top, and a paper transport path 14 is formed so as to reach the paper discharge section 13 from the paper feed tray 12. On the paper transport path 14, a pick-up roll 14 a for picking up the paper P from the paper feed tray 12 to the paper transport path 14 one by one, a paper roll P for the paper roll 14 b, a transport roll 14 c for transporting the paper P, and on the paper P A fixing device 15 for fixing the toner image and a discharge roll 14d for discharging the paper P to the paper discharge unit 13 are provided.

  In addition, the image forming apparatus 10 includes an image forming unit 20 in the center of the housing 11. The image forming unit 20 is stretched around a drive roll 30, a backup roll 31, and a driven roll 32, and has an intermediate transfer belt 33 that circulates and moves in the direction of the arrow in FIG. The image forming units 21Y, 21M, 21C, and 21K having photoreceptors 22Y, 22M, 22C, and 22K on which toner images for the respective colors of YMCK are formed while being detachably arranged and rotating in the direction of the arrow in the figure. The image forming apparatus includes primary transfer rolls 26Y, 26M, 26C, and 26K that are disposed inside the intermediate transfer belt 33 and transfer the toner images formed on the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K to the intermediate transfer belt 33.

  The image forming units 21Y, 21M, 21C, and 21K include the photoreceptors 22Y, 22M, 22C, and 22K, the charger 23 that uniformly charges the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K, and the photoreceptor 22Y, respectively. , 22M, 22C, and 22K, a developing device 24 that forms toner images on the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K by developing an electrostatic latent image formed by the optical scanning device 100 described later with toner. And a photoreceptor cleaning unit 25 that collects toner remaining on the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K.

  The developing device 24 has a housing 24a for containing toner. In the housing 24a, the toner is supplied to the photosensitive members 22Y, 22M, 22C, and 22K, and electrostatic latent images on the photosensitive members 22Y, 22M, 22C, and 22K are supplied. A developing roll 24b for developing the image with toner, a supply auger 24c for supplying the toner to the developing roll 24b, and a stirring auger 24d for stirring the toner and supplying the toner to the supply auger 24c are provided. The developing device 24 is supplied with toner of each color from toner boxes 35Y, 35M, 35C, and 35K.

  The image forming unit 20 is provided with a secondary transfer roll 34 on the opposite side of the backup roll 31 with the intermediate transfer belt 33 interposed therebetween, and the toner image on the intermediate transfer belt 33 is transferred in the nip region to be formed with the backup roll 31. Secondary transfer is performed on the paper P.

  Further, the image forming unit 20 is provided with a belt cleaning unit 40 on the upstream side of the image forming unit 21Y and on the opposite side of the drive roll 30 with the intermediate transfer belt 33 interposed therebetween. The belt cleaning unit 40 is pressed toward the driving roll 30 and scrapes off and collects the toner remaining on the intermediate transfer belt 33.

  The optical scanning device 100 includes an optical box 101, a light source including four semiconductor lasers that emit light beams 111Y, 111M, 111C, and 111K by a single laser modulated based on image data of each color of YMCK. And an optical system for converting the optical path of the light beams 111Y, 111M, 111C, and 111K emitted from the respective semiconductor lasers in directions corresponding to the arrangement positions of the photosensitive members 22Y, 22M, 22C, and 22K.

  FIG. 2 is a perspective view showing the external appearance of the optical scanning device 100.

(Optical box)
The optical scanning device 100 includes the optical box 101 having a substantially box shape that supports a semiconductor laser and accommodates an optical system. The optical box 101 includes a box main body 102 having an opening above and a box main body 102. And a lid 103 that covers the opening. The box main body 102 and the lid 103 are integrally formed by injection molding from, for example, a PET (polyethylene terephthalate) -based or PC (polycarbonate) -based glass fiber reinforced resin.

The box body 102 includes a bottom wall 104 that supports the optical system, side walls 105a to 105d formed on four sides of the bottom wall 104, and four seats 106 that are provided at four corners and are fixed to the frame 11a. In the seat portion 106, a seat plate 106a is provided at a portion in contact with the frame 11a, and an attachment hole 106b is formed so as to penetrate the seat plate 106a. Seat 106, a screw attached to the frame 11a through the mounting holes 106b by _{N 2} (Figure 3A,. Shown in Figure 3B). The frame 11a is made of a metal such as aluminum or stainless steel that constitutes a part of the casing 11 shown in FIG. 1, and is grounded to the ground.

  The lid 103 is provided with four glass windows 103a for transmitting the four light beams 111Y, 111M, 111C, and 111K.

  A light source drive substrate 120 on which a semiconductor laser is mounted and a shield box 130 that is an example of a shielding member that shields electromagnetic waves generated from the light source drive substrate 120 are attached to one side wall 105 a of the box body 102.

(Shield box)
The shield box 130 is formed by bending a main wall 131, a side wall 132 provided above the main wall 131, a side wall 133 provided on both left and right sides of the main wall 131, and a part of each side wall 133. A seat portion 134 and a seat portion 135 formed by bending a portion extending from the main wall 131 are provided.

Mounting holes 134a and 135a are formed in the seat portions 134 and 135, respectively. Seat 134 is attached to the side wall 105a of the box body 102 by co-fastening the light source driving board 120 through the grounding area of the light source driving board 120 through the mounting holes 134a by a screw _{N 1.} Moreover, the seat part 135 is attached to the frame 11a via a mounting hole 135a with a screw. Since the shield box 130 and the frame 11a are made of metal, conduction is ensured by screwing.

The main wall 131 has a hole 131a for passing a screw _{N 1} to the mounting hole 134a of the seat 134, bore 131b for connecting the connector to the light source driving board 120 on the connector 121a-121c, 131c is formed Yes.

  The shield box 130 can be formed, for example, by bending a metal plate such as aluminum, copper, and stainless steel. The shield box 130 can be formed of a plastic containing a conductive filler such as a carbon filler or a metal filler, a plastic coated with a conductive paint, or the like. Although not shown in FIG. 2, by protecting the light source driving substrate 120 with the shield box 130, an electrical component that generates heat, such as an HV (High Voltage) substrate, can be arranged nearby, thereby The forming apparatus 10 can be downsized. This is because HV generates heat, but the light source can be shielded from heat by the metal shield.

(Optical system of optical scanning device)
3A and 3B mainly show an optical system of the optical scanning device 100, FIG. 3A is a front view, and FIG. 3B is a plan view. 3A, the light source drive board 120 and the shield box 130 are omitted, and in FIG. 3B, the shield box 130 is omitted.

  The optical scanning device 100 includes semiconductor lasers 110Y, 110M, 110C, and 110K that emit light beams 111Y, 111M, 111C, and 111K corresponding to YMCK colors, and a light beam 111Y that is emitted from the semiconductor lasers 110Y, 110M, 110C, and 110K. , 111M, 111C, 111K, a first optical system 140 having a rotating polygon mirror 141, and light beams 111Y, 111M, 111C, 111K from the first optical system 140 of the respective photoreceptors 22Y, 22M, 22C, 22K. And a second optical system 150 having a light separating polygonal mirror 151 that separates in a direction according to the arrangement position. The first optical system 140 and the second optical system 150 are accommodated in the optical box 101.

  The first optical system 140 includes a collimator lens 142, a slit 143, a first reflecting mirror 144A, a first lens system 145A, and a second reflecting mirror 144B between the semiconductor lasers 110Y, 110M, 110C, and 110K and the rotary polygon mirror 141. The third reflecting mirror 144C and the second lens system 145B are disposed, and the first fθ lens 146A, the second fθ lens 146B, and the folding mirror 147 are disposed at the subsequent stage of the rotary polygon mirror 141.

  The second optical system 150 includes the light separating polygonal mirror 151, reflecting mirrors 152Y, 152M, 152C, and 152K that reflect the four light beams 111Y, 111M, 111C, and 111K separated by the light separating polygonal mirror 151, Final mirrors 153Y, 153M, 153C, and 153K that collect and reflect the four light beams 111Y, 111M, 111C, and 111K reflected by the reflecting mirrors 152Y, 152M, 152C, and 152K on the photosensitive members 22Y, 22M, 22C, and 22K, respectively. With. Further, the second optical system 150 reflects, for example, the scanning start side beam of the light beam 111K that has passed through the light separating polygonal mirror 151 by the SOS mirror 154, is condensed by the SOS lens 155, is incident on the SOS sensor 156, and is input to each color. The export timing is set.

  4 and 5 are views of the optical box 101 shown in FIG. 2 as viewed from the shield box 130 side, and FIG. 4A is a view showing a state in which the light source drive board 120 and the shield box 130 are removed. FIG. 4B is a diagram illustrating the positional relationship between the semiconductor laser 110 and the boss 108. FIG. 5 is a diagram illustrating a state where the shield box 130 is removed. 6 is a cross-sectional view taken along line AA in FIG.

4 (a) and as shown in FIG. 6, the side wall 105a, a semiconductor laser 110C, 110Y, 110K, the four holders 112 screw _{N 3} for holding individually by pressing the 110M in the hole 112a on the side wall 105a It is fixed to the formed boss 107 shown in FIG. The semiconductor lasers 110C, 110Y, 110K, and 110M supply a current to the lead wire 110a exposed from the bottom surface, and actually adjust the optical path by emitting the light beams 111Y, 111M, 111C, and 111K, and then the holder 112. Is fixed to the side wall 105a.

The side wall 105a is provided with four bosses 108A to 108D in which a female screw 108a for attaching the light source driving substrate 120 is formed. The two lower bosses 108 </ b> A and 108 </ b> B, which are an example of the attachment portion, are provided at positions overlapping the bottom wall 104. The upper right boss 108D is provided at a position lower than the upper left boss 108C. That is, the two bosses 108C of the upper, which is an example of a mounting portion, 108D includes four semiconductor lasers 110C, 110Y, 110K, the same array lines _{L 1} and the inclination direction of the 110M, and on adjacent lines _{L 2} Is provided.

  The two bosses 108C and 108D close to the semiconductor lasers 110C and 110M located on both sides are, for example, as shown in FIG. 4B, an elliptical area (a hatched area) where a = 30 mm and b = 20 mm. Is preferably present. The lower two bosses 108 </ b> A and 108 </ b> B only need to be provided at a position where the outer shape partially overlaps the bottom wall 104.

  Due to the above-described boss arrangement, the boss is connected to the bottom wall 104 and becomes strong. The shield box 130 is preferably a metal sheet metal structure, but is often bent to provide a mounting shape. If a sheet metal part is bent, the accuracy of that part will deteriorate. As an explanation of the deterioration in accuracy, as in the example of FIG. 8, the bending effect of the seat portion 135 causes the side wall 105 a of the housing (102) to fall. Although the shield box 130 is made of metal and is strong, the housing (102) is made of plastic and has a difference in strength, so that this has conventionally occurred. Even if an attempt is made to tilt the side wall 105a of the housing (102) due to the dimensional error, the boss is connected to the bottom wall 104 and is not easily collapsed. That is, the side wall 105a is hard to fall down. Therefore, even if different materials such as the metal shield box 130 and the plastic housing (102) are used, the wall of the housing (102) is not overturned, so that optical scanning using an inexpensive plastic housing while improving the shielding performance. Since an apparatus can be provided, an inexpensive electrophotographic apparatus can be provided. Further, the light source drive substrate 120 and the shield box 130 may be fixed to separate bosses without being fastened together. One boss provided at a position overlapping with the bottom wall 104 may be provided, and the shield box 130 may be attached to the one boss alone or together with the light source driving substrate 120.

  As shown in FIGS. 5 and 6, the light source driving board 120 is a circuit board in which a circuit is formed on the front and back surfaces of an insulating base material such as an epoxy resin with a conductive pattern made of a conductive material such as copper, and the like. A driver IC for driving the lasers 110C, 110Y, 110K, and 110M is mounted. The light source drive substrate 120 is provided with the connector 121 described above, and four mounting holes 120a to 120d and through holes 120e through which the lead wires 110a of the semiconductor lasers 110C, 110Y, 110K, and 110M pass are formed. After the lead wire 110a is inserted into the through hole 120e, the lead wire 110a is connected to a conductive pattern formed on the back surface of the light source driving substrate 120 by soldering. The light source driving board 120 has a ground area around the lower two holes 120c and 120d.

The light source drive board 120 is screwed to the bosses 108C and 108D shown in FIG. 4 through the upper two mounting holes 120a and 120b. The upper left hole 120a is a circular hole having a size corresponding to the female screw 108a of the boss 108C, the upper right hole 120b is a long hole that is long in the left-right direction, and the lower two holes 120c and 120d are upper left holes. It is a circular hole having a diameter larger than that of the hole 120a. Thereby, the light source drive board | substrate 120 is positioned on the basis of the upper left hole 120a. As described above, array line _{L 2} of the two holes 120a, and 120b upper light source driving board 120, four semiconductor lasers 110C, 110Y, 110K, the same array lines _{L 1} and the inclination direction of the 110M, and It is close. As a result, the amount of exposure of the lead wires 110a of the semiconductor lasers 110C, 110Y, 110K, and 110M from the through holes 120e of the light source driving substrate 120 is stabilized, and the soldering work of the lead wires 110a is ensured. Further, it is possible to suppress the displacement of the positions of the semiconductor lasers 110C, 110Y, 110K, and 110M by attaching the light source driving substrate 120 to the side wall 105a. The light source driving board 120 is a circuit board formed with a glass epoxy, a metallic etching pattern or the like, and has a high strength. Therefore, in order to mount this board on the side wall 105a where the light source is installed, a plastic housing The parallelism of the mounting boss on the (102) side must be made accurate. Otherwise, the wall of the plastic housing (102) may be defeated by the strength of the drive substrate, and the optical path may be distorted. However, in this example, two points (108D and 108B) out of the four points fixed to the screw are close to each other, that is, four points indicated by 108A and 108C and adjacent 108B and 108C, but approximate three-point fixed. It becomes. Therefore, it was necessary to strictly control the parallelism of the boss height when fixed at four points apart, but in this example, since it is approximated as fixed at three points, the drive board is attached following the approximate three-point boss. The wall of the housing (102) is not knocked down. Therefore, since the parallelism of the boss can be lowered, the housing (102) can be made at low cost.

(Operation of image forming apparatus)
Next, an outline of the operation of the image forming apparatus 10 will be described. The optical scanning device 100 irradiates the photoconductors 22Y, 22M, 22C, and 22K with the light beams 111Y, 111M, 111C, and 111K modulated based on the image data of each color of YMCK, and outputs the photoconductors 22Y, 22M, 22C, and 22K. An electrostatic latent image is formed on the surface. That is, as shown in FIGS. 3A and 3B, the semiconductor lasers 110C, 110Y, 110K, and 110M are driven on the light source driving substrate 120 by the driver IC, and emit light beams 111Y, 111M, 111C, and 111K. At this time, an electromagnetic wave is generated from the light source driving substrate 120, but is shielded by the shield box 130. The light beams 111Y, 111M, 111C, and 111K emitted from the semiconductor lasers 110C, 110Y, 110K, and 110M are scanned by the rotary polygon mirror 141 of the first optical system 140, and are folded by the folding mirror 147, and then the second optical. The light is separated by the light separating polygonal mirror 151 of the system 150 and irradiated to the photoreceptors 22Y, 22M, 22C, and 22K through the reflecting mirrors 152Y, 152M, 152C, and 152K and the final mirrors 153Y, 153M, 153C, and 153K.

  The electrostatic latent images formed on the photoconductors 22Y, 22M, 22C, and 22K by irradiation with the light beams 111Y, 111M, 111C, and 111K are developed with toner by the developing device 24 to form a toner image. The toner images on the photoreceptors 22Y, 22M, 22C, and 22K are transferred to the intermediate transfer belt 33 by the primary transfer rolls 26Y, 26M, 26C, and 26K.

  On the other hand, from the paper feed tray 12, the paper P is taken into the paper transport path 14 by the pick-up roll 14a, and after being rolled by the roll 14b, is transported to the secondary transfer roll 34 by the transport roll 14c, and the intermediate transfer belt 33. The upper toner image is transferred to the paper P.

  Thereafter, the toner image on the paper P is fixed by the fixing device 15 and then discharged to the paper discharge unit 13 by the discharge roll 14d.

  Here, the mounting structure of the shield box 130 will be described with reference to a comparative example.

(Comparative Example 1)
FIG. 7 is a cross-sectional view illustrating a configuration according to Comparative Example 1. In this comparative example 1, the shield box 130 and the frame 11a are connected by the wiring (harness) 136 without screwing the shield box 130 and the frame 11a. In Comparative Example 1, grounding is performed using a harness. However, since the grounding performance varies because the harness is staggered, stable shielding performance cannot be obtained.

(Comparative Example 2)
FIG. 8 is a cross-sectional view illustrating a configuration according to the second comparative example. In this comparative example 2, the shield box 130 is screwed even at a position where it does not overlap the side wall 105 a and the bottom wall 104 of the box body 102. In Comparative Example 2, depending on the processing accuracy of the shield box 130, the side wall 105a may be tilted and the adjusted optical path may be shifted, affecting the image quality.

  According to the mounting structure of the shield box 130 of the present embodiment, the electromagnetic wave generated from the light source drive board 120 is radiated from the shield box 130 to the outside by covering the periphery of the light source drive board 120 with the shield box 130. It is suppressed. Further, since the shield box 130 is fixed at a position overlapping the bottom wall 104 of the box body 102 and is directly grounded by the shield box 130 itself, stable shielding performance can be obtained. Further, the processing accuracy of the shield box 130 does not become a problem as compared with the comparative example 2.

(Modification 1)
FIG. 9 is a view illustrating a seat portion of the shield box according to the first modification. In the first modification, a notch 135 b is provided at the base of the seat portion 135 fixed to the frame 11 a of the shield box 130. Thereby, when attaching the shield box 130, an error in the processing accuracy of the shield box 130 is absorbed by the base of the seat portion 135, and the possibility that the side wall 105a of the box body 102 is tilted is reduced.

(Modification 2)
FIG. 10 is a cross-sectional view illustrating a configuration according to the second modification. In the second modification, the light source driving board 120 and the shield box 130 are not fastened together, and the light source driving board 120 is screwed to a boss formed on the side wall 105a of the box body 120 alone. This is screwed to a boss 108 provided at a position overlapping the bottom wall 104 of the box body 120. According to this configuration, even if the shield box 130 falls down when the shield box 130 is attached due to the processing accuracy of the shield box 130, the side wall 105a is not pushed, so that the side wall 105a can be prevented from falling down. .

(Modification 3)
11A and 11B show a configuration according to Modification Example 3. FIG. 11A is a perspective view and FIG. 11B is a cross-sectional view. In the third modification, the bending direction of the seat portion 134 is the same as that of the side wall 132. According to this, the error part of the bending part a of the seat part 135 fixed to the frame 11a can be absorbed by the bending parts b and c of the seat part 134, and the side wall 105a can be further prevented from falling down. It becomes.

  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 case where a plurality of semiconductor lasers are used as the light source has been described. However, the present invention can also be applied to the case where one semiconductor laser is used. The present invention can also be applied when a light emitting diode is used as a light source.

DESCRIPTION OF SYMBOLS 10 ... Image forming apparatus, 11 ... Housing | casing, 11a ... Frame, 12 ... Paper feed tray, 13 ... Paper discharge part, 14 ... Paper conveyance path, 14a ... Pickup roll, 14b ... Separation roll, 14c ... Conveyance roll, 14d ... Ejection roll, 15 ... fixing unit, 20 ... image forming unit, 21Y, 21M, 21C, 21K ... image forming unit, 22Y, 22M, 22C, 22K ... photoconductor, 23 ... charger, 24 ... developing unit, 24a ... housing 24b ... developing roll, 24c ... supply auger, 24d ... stirring auger, 25 ... photoconductor cleaning unit, 26Y, 26M, 26C, 26K ... primary transfer roll, 30 ... drive roll, 31 ... backup roll, 32 ... driven roll, 33 ... Intermediate transfer belt, 34 ... Secondary transfer roll, 35Y, 35M, 35C, 35K ... Toner box, 40 ... Bell Cleaning unit, 100 ... optical scanning device, 101 ... optical box, 102 ... box body, 103 ... lid, 103a ... glass window, 104 ... bottom wall, 105a-105d ... side wall, 106 ... seat, 106a ... seat plate, 106b ... mounting hole, 107 ... boss, 108A to 108D ... boss, 110a ... lead wire, 110Y, 110M, 110C, 110K ... semiconductor laser, 111Y, 111M, 111C, 111K ... light beam, 112 ... holder, 112a ... hole, DESCRIPTION OF SYMBOLS 120 ... Light source drive board | substrate, 120a-120c ... Mounting hole, 120e ... Through-hole, 121a-121c ... Connector, 130 ... Shield box, 131 ... Main wall, 131a, 131b, 131c ... Hole, 132, 133 ... Side wall, 134, 135: Seat, 134a, 135a ... Mounting hole, 135b ... Notch, 136 Wiring 140 ... first optical system 141 ... rotating polygon mirror 142 ... collimator lens 143 ... slit 144A ... first reflection mirror 144B ... second reflection mirror 144C ... third reflection mirror 145A ... first lens System, 145B, second lens system, 146A, first fθ lens, 146B, second fθ lens, 147, folding mirror, 150, second optical system, 151, light separating polygonal mirror, 152Y, 152M, 152C, 152K, reflecting mirror , 153Y, 153M, 153C, 153K ... last mirror, 154 ... SOS mirror, 155 ... S0S lens, 156 ... SOS sensor, P ... paper

Claims (5)

A substrate on which a light source for emitting a light beam and a circuit for driving the light source are mounted;
A resin box having a side wall to which the substrate is attached and a bottom wall on which an optical system for scanning the light beam emitted from the light source in a predetermined direction is disposed;
A mounting member is formed, and a shielding member that shields electromagnetic waves generated from the substrate;
A mounting portion provided at a position overlapping the bottom wall of the side wall of the box, and screwed through the mounting hole formed in the shielding member;
Equipped with a,
The substrate is provided with a mounting hole,
The optical scanning device , wherein the shielding member is screwed to the attachment portion by fastening together with the substrate through the attachment hole formed in the shielding member and the attachment hole formed in the substrate . The light source mounted on the substrate is a plurality of semiconductor lasers arranged on the substrate in an oblique direction with respect to the arrangement direction of the mounting holes of the substrate,
The substrate is further formed with two attachment holes provided on the side wall of the box on the line having the same inclination direction as that of the plurality of semiconductor lasers and close to the line.
Provided in the side wall of the box, the two other mounting portion to be screwed through the two mounting holes formed in the substrate, the optical scanning apparatus according to claim 1, further comprising. The shielding member includes a seat which has mounting holes are formed, said seat through said mounting hole formed in said seat, in claim 2 which is screwed to the frame to the ground The optical scanning device described. An image forming apparatus having an optical scanning apparatus according to any one of claims 1 to 3 for irradiating a light beam modulated based on image data on the photoreceptor. The shielding member of the optical scanning device is made of metal,
The image forming apparatus according to claim 4 , further comprising a high voltage supply substrate disposed adjacent to the shielding member.

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