JP2018084734A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that can arrange a circuit board having a power supply element mounted thereon without increasing the size of an apparatus body.SOLUTION: A circuit board 100 is provided substantially in parallel with a conveyance path R for a recording material P that is arranged in the vertical direction on the back of the body of the image forming apparatus A, and a low-voltage power supply element part 110 and a high-voltage power supply element part 120 mounted on the circuit board 100 are stored in a space 19 formed between the conveyance path R and circuit board 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, and a facsimile machine.

  The image forming apparatus is provided with a circuit board having an electrical component such as an AC power supply or a DC power supply. In Patent Document 1, an electrical component is provided in a lower space of a recording material conveyance path that extends in an oblique direction from a paper feed roller that feeds a recording material from a paper feeding cassette to a fixing device. As a result, a path for airflow generated by heat generated from the electrical equipment section is secured.

  The heat generated from the fixing device arranged at the upper part of the electrical unit is discharged from the louver unit provided on the exterior cover to the outside of the apparatus. By providing a space between the rear surface of the fixing device and the exterior cover, an air flow due to waste heat of the fixing device is also generated in this portion. By providing a large space below the fixing unit and arranging the electrical unit, an air flow for waste heat from the electrical unit to the fixing unit can be generated without a cooling fan, etc. It can eliminate the clouding and prevent the temperature rise.

JP 2001-235919 A

  A plurality of electronic elements are mounted on the circuit board provided with the electrical component substantially perpendicular to the board. In order to accommodate these tall power supply elements in the apparatus main body of the comparative example shown in FIGS. 9 and 10 and described later, it is necessary to secure a large space outside the apparatus main body of the side plate. For this reason, an apparatus main body spreads in the left-right longitudinal direction, and an apparatus will enlarge.

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus in which a circuit board on which a power supply element is mounted can be arranged without increasing the size of the apparatus main body.

  In order to achieve the above object, a typical configuration of the image forming apparatus according to the present invention includes a circuit board provided substantially in parallel with a recording material conveyance path, and is formed between the conveyance path and the circuit board. An electronic element mounted on the circuit board is accommodated in a space.

  According to the present invention, the circuit board on which the power supply element is mounted can be arranged without increasing the size of the apparatus main body.

1 is an explanatory cross-sectional view illustrating a configuration of a first embodiment of an image forming apparatus according to the present invention. FIG. 3 is a perspective explanatory view of the frame configuration of the image forming apparatus according to the first embodiment viewed from one side plate side. FIG. 3 is a perspective explanatory view of the frame configuration of the image forming apparatus according to the first embodiment viewed from the other side plate. FIG. 3 is an explanatory perspective view illustrating a state where a drive unit and an image signal line are attached to the main body of the image forming apparatus illustrated in FIG. 2. FIG. 4 is a perspective explanatory view showing a state in which a drive unit and an image signal line are attached to the main body of the image forming apparatus shown in FIG. 3. It is a perspective explanatory view showing the composition of the drive unit of a 1st embodiment. It is a perspective explanatory view showing the configuration of the circuit board of the first embodiment. FIG. 6 is a cross-sectional explanatory view showing a configuration of a second embodiment of the image forming apparatus according to the present invention. FIG. 3 is an explanatory cross-sectional view illustrating a configuration of a comparative image forming apparatus. It is a perspective explanatory view showing a frame configuration of an image forming apparatus of a comparative example.

  An embodiment of an image forming apparatus according to the present invention will be specifically described with reference to the drawings.

  The configuration of the first embodiment of the image forming apparatus according to the present invention will be described with reference to FIGS.

<Image forming apparatus>
First, the configuration of the image forming apparatus A according to the present invention will be described with reference to FIG. FIG. 1 is an explanatory cross-sectional view showing a configuration of a first embodiment of an image forming apparatus A according to the present invention. An image forming apparatus A shown in FIG. 1 is an example of an electrophotographic laser beam printer. A process cartridge B is detachably attached to the main body of the image forming apparatus A shown in FIG. The process cartridge B is integrally provided with a photosensitive drum 8 serving as an image carrier, a charging roller serving as a charging unit (not shown), a developing device 1 serving as a developing unit, a cleaner 2 serving as a cleaning unit, and the like. It has been.

  On the upper part of the image forming apparatus A main body, an opening / closing door 13 is rotatably supported. As shown by a broken line in FIG. 1, the process cartridge B becomes detachable from the main body of the image forming apparatus A by opening the door 13. A laser scanner 3 serving as an exposure device (exposure means) is provided in the main body of the image forming apparatus A.

  A laser beam L corresponding to the image information emitted from the laser scanner 3 is irradiated onto the surface of the photosensitive drum 8 uniformly charged by a charging roller (not shown). As a result, an electrostatic latent image corresponding to the image information is formed on the surface of the photosensitive drum 8. The laser scanner 3 (exposure device) forms an electrostatic latent image corresponding to the image information on the surface of the photosensitive drum 8 (image carrier). The electrostatic latent image formed on the surface of the photosensitive drum 8 is supplied with toner as a developer from a developing roller (not shown) serving as a developer carrier provided in the developing device 1 and is developed as a toner image. .

  On the other hand, a feeding tray 4 in which the recording material P is accommodated is provided at the lower part of the main body of the image forming apparatus A. The main body of the image forming apparatus A is provided with a conveyance path R through which the recording material P is conveyed. 1, along the conveyance direction of the recording material P indicated by the arrow D in FIG. 1, the feeding roller 5, the conveyance roller 11 serving as a conveyance rotation body that conveys the recording material P, and the recording material P are conveyed. A registration roller 6 is provided as a transport roller that serves as a transport rotating body.

  Further, there is provided a transfer roller 7 which is a transfer means for transferring the toner image formed on the surface of the photosensitive drum 8 (image carrier) to the recording material P and serves as a conveyance rotating body for conveying the recording material P. Further, a heating roller 9a provided in a fixing device 9 serving as a fixing unit that fixes a toner image (image) on the recording material P, and a conveyance rotating body provided opposite to the heating roller 9a and conveying the recording material P. A pressure roller 9b serving as a fixing roller, a discharge roller 10 and the like are sequentially arranged.

<Frame body configuration>
Next, the frame structure of the image forming apparatus A will be described with reference to FIGS. FIG. 2 is a perspective explanatory view of the frame structure of the image forming apparatus A as viewed from the side plate 15 side. FIG. 3 is a perspective explanatory view of the frame structure of the image forming apparatus A as viewed from the other side plate 16 side. FIG. 4 is a perspective explanatory view showing a state in which the drive unit 50 and the image signal lines 150 and 151 are attached to the main body of the image forming apparatus A shown in FIG. FIG. 5 is an explanatory perspective view showing a state in which the drive unit 50 and the image signal lines 150 and 151 are attached to the main body of the image forming apparatus A shown in FIG. 2 to 5 is the longitudinal direction of the main body of the image forming apparatus A, and is the axial direction of each roller that conveys the recording material P such as the transfer roller 7.

  The main body of the image forming apparatus A is provided with a conveyance guide 14 that constitutes a conveyance path R of the recording material P. At both ends of the conveyance guide 14 in the direction of the arrow M, side plates 15 and 16 that are orthogonal to the conveyance guide 14 and face each other are provided. The conveyance guide 14 and the side plates 15 and 16 are formed of an integral resin mold for reducing the size and weight of the image forming apparatus A main body and reducing the cost.

  Guide rails 15a and 16a for guiding the movement of the process cartridge B when the process cartridge B is attached and detached are provided inside the image forming apparatus A main body of the side plates 15 and 16, respectively. By inserting engaging portions (not shown) provided at both ends in the longitudinal direction of the process cartridge B along the guide rails 15 a and 16 a, the process cartridge B is positioned with respect to the side plates 15 and 16.

  The laser scanner 3 is supported by being fixed to the support stay 17 by a fixing means such as a screw so as to be arranged in a direction substantially perpendicular to the installation surface of the image forming apparatus A. On the other hand, the support stay 17 is supported by being pulled by a tension spring 17 a serving as a biasing means on the outside of the side plates 15 and 16.

  One end portions of the pair of tension springs 17 a that urge the support stays 17 are respectively engaged with both longitudinal end portions of the support stays 17. The other end of one tension spring 17a is locked by a sheet metal 52 shown in FIG. 4, and the other end of the other tension spring 17a is locked by a sheet metal 18 shown in FIG. .

  On the back side of the main body of the image forming apparatus A (the main body of the image forming apparatus), the circuit board 100 is fixed and supported on the outside of the conveyance guide 14 by fixing means such as screws. The circuit board 100 is disposed substantially perpendicular to the installation surface of the image forming apparatus A. The circuit board 100 is arranged in parallel with the arrow M direction in FIGS. As shown in FIG. 1, the laser scanner 3 (exposure device) is disposed substantially perpendicular to the installation surface of the image forming apparatus A. As a result, the laser scanner 3 (exposure apparatus) and the substrate surface 100a of the circuit board 100 are arranged substantially in parallel.

<Drive unit>
Next, the configuration of the drive unit 50 will be described with reference to FIG. FIG. 6 is a perspective explanatory view showing the configuration of the drive unit 50. As shown in FIGS. 4 and 5, a drive unit 50 is provided outside the side plate 15. As shown in FIG. 6, a plurality of gears 12 a to 12 h are rotatably supported on the sheet metal 52 of the drive unit 50.

  A motor 51 serving as a driving source is fixed and supported on the side plate 15 by a fixing member such as a screw (not shown). A drive gear 51a fixed to the drive shaft of the motor 51 is engaged with the gears 12a and 12g, respectively. The gear 12a is meshed with the gear 12b, the gear 12b is meshed with the gear 12c, and the gear 12c is meshed with the gears 12d and 12f, respectively. Furthermore, the gear 12d is meshed with the gear 12e. The gear 12g is meshed with the gear 12h.

  As a result, the rotational driving force of the motor 51 is supplied to the feed roller 5, the transport roller 11, the registration roller 6, the photosensitive drum 8, the heating roller 9a, and the pressure roller shown in FIG. 9b and the discharge roller 10, respectively.

<Image forming operation>
Next, an image forming operation of the image forming apparatus A will be described with reference to FIG. The surface of the photosensitive drum 8 that rotates clockwise in FIG. 1 is uniformly charged by a charging roller (not shown). Laser light L corresponding to the image information emitted from the laser scanner 3 is irradiated onto the uniformly charged surface of the photosensitive drum 8. Thereby, an electrostatic latent image is formed on the surface of the photosensitive drum 8. To the electrostatic latent image formed on the surface of the photosensitive drum 8, toner as a developer is supplied from a developing roller (not shown) serving as a developer carrying member provided in the developing device 1. As a result, a toner image corresponding to the image information is formed on the surface of the photosensitive drum 8.

  On the other hand, in accordance with the output timing of the laser light L emitted from the laser scanner 3, it is accommodated in the feed tray 4 by the feed roller 5 to which the rotational driving force of the motor 51 is transmitted by the drive unit 50 shown in FIG. The recorded material P is fed out. Thereafter, the recording material P is separated and fed one by one in cooperation with a separating means (not shown).

  Thereafter, the recording material P is nipped and conveyed by the conveying roller 11 and is applied to the nip portion of the registration roller 6 where the leading end portion of the recording material P is stopped. After the recording material P is handled by the stiffness of the recording material P and the skew of the recording material P is corrected, the registration roller 6 rotates at a predetermined timing, and the recording material P is sandwiched between the registration rollers 6 and the photosensitive drum. 8 and the transfer roller 7 are conveyed to a transfer nip portion N1.

  As shown in FIGS. 2 to 5, the transfer roller 7 is rotatably supported at both ends of the conveyance guide 14 in the arrow M direction via a pair of bearing members 7 a. The transfer roller 7 is provided so as to apply a predetermined contact pressure to the surface of the photosensitive drum 8 by a pressing spring 7b serving as an urging unit attached to the bearing member 7a.

  The transfer roller 7 contacts the surface of the photosensitive drum 8 to form a transfer nip portion N1. A transfer bias is applied to the transfer roller 7 from a transfer bias power source (not shown). Thus, the toner image formed on the surface of the photosensitive drum 8 is transferred to the recording material P that is nipped and conveyed by the registration roller 6. The transfer roller 7 provided in the conveyance guide 14 is not connected to the gear train 12 shown in FIG. 6 and rotates following the rotation of the photosensitive drum 8.

  In the transfer nip portion N1, the recording material P on which the toner image has been transferred is conveyed to the fixing device 9 via the conveyance path R. The fixing device 9 is provided with a pressure roller 9b and a heating roller 9a supported so as to be rotatable with respect to the frame body 9c. The frame 9c of the fixing device 9 is fixed to the upper surface portions of the side plates 15 and 16 by fixing members such as screws (not shown). A driving gear (not shown) is fixed to one end of the rotating shaft of the pressure roller 9b in the longitudinal direction. The drive gear of the pressure roller 9b is meshed with the gear 12d of the gear train 12 shown in FIG. As a result, the rotational driving force from the motor 51 as a driving source is transmitted to the pressure roller 9b via the gear train 12, and the pressure roller 9b rotates.

  The recording material P to which the toner image has been transferred in the transfer nip portion N1 is heated and pressed in the process of passing through the fixing nip portion N2 formed by the heating roller 9a and the pressure roller 9b, and the toner image is heated. It is melted and thermally fixed to the recording material P. Thereafter, the recording material P on which the toner image has been fixed is nipped and conveyed by the heating roller 9a and the pressure roller 9b, and is further nipped and conveyed by the discharge roller 10 on a discharge tray 13a provided on the open / close door 13. Discharged.

<Circuit board>
Next, the configuration of the circuit board 100 will be described with reference to FIG. FIG. 7 is a perspective explanatory view showing the configuration of the circuit board 100. The circuit board 100 shown in FIG. 7 is provided with a low-voltage power supply element 110 that takes in AC power from an external commercial power source and converts it into DC power. Further, a high voltage power supply element 120 for supplying a high voltage necessary for image formation to the process cartridge B and the transfer roller 7 is provided.

  The circuit board 100 of the present embodiment integrally mounts electronic elements including a low-voltage power supply element portion 110 made of a low-voltage power supply element and a high-voltage power supply element portion 120 made of a high-voltage power supply element. The circuit board 100 shown in FIG. 7 is further provided with a plurality of conveyance sensors 130 for detecting the conveyance state of the recording material P conveyed along the conveyance path R. Further, in order to send an image signal to the laser scanner 3, a connector part 140 for connecting the image signal lines 150 and 151 shown in FIGS. 4 and 5 is mounted.

  In the present embodiment, the low voltage power element unit 110 and the plurality of electronic elements of the high voltage power element unit 120 are mounted in a direction perpendicular to the substrate surface 100 a of the circuit board 100. Among these plural electronic elements, the tallest electronic element protruding from the substrate surface 100 a of the circuit board 100 is a low-voltage power transformer 111 that is a part of the low-voltage power element unit 110. For this reason, the tallest apex T protruding from the substrate surface 100 a of the circuit board 100 of the low-voltage power transformer 111 is the portion protruding most in the vertical direction of the circuit board 100.

  The circuit board 100 is provided substantially parallel to the conveyance path R of the recording material P arranged in the vertical direction in FIG. The circuit board 100 side of the conveyance path R is configured by a conveyance guide 14 arranged in the vertical direction in FIG. A space 19 is formed between the substrate surface 100 a of the circuit board 100 and the transport guide 14. The low-voltage power element unit 110 and the high-voltage power element unit 120 that are electronic elements mounted on the circuit board 100 are accommodated in a space 19 (in the space) formed between the conveyance guide 14 and the circuit board 100. .

  Here, points 6 a, 7 c, 9 b 1 where the surface of at least one of the transport roller 11, the registration roller 6, the transfer roller 7, and the pressure roller 9 b is closest to the substrate surface 100 a of the circuit board 100 are considered. A plane V1 passing through these points 6a, 7c, 9b1 and parallel to the substrate surface 100a of the circuit board 100 is considered. The apex T of the low-voltage power transformer 111 is disposed so as to protrude closer to the transport path R side (right side in FIG. 1) than the surface V1.

  That is, the circuit board 100 side (circuit board) on the surface of at least one of the transport roller 11, the registration roller 6, the transfer roller 7, and the pressure roller 9b (fixing roller) serving as a transport rotating body provided in the transport path R. Side)). A plane V1 passing through the closest part and parallel to the substrate surface 100a of the circuit board 100 is considered. Of the plurality of electronic elements mounted on the circuit board 100, the apex T of the low-voltage power transformer 111, which is the tallest electronic element, is disposed so as to protrude from the surface V1 toward the transport path R (transport path side). Is done. Accordingly, it is not necessary to widen the front-rear direction (the left-right direction in FIG. 1) of the image forming apparatus A in order to accommodate the low-voltage power transformer 111, and the image forming apparatus A can be downsized.

  Further, the low-voltage power supply element portion 110 (electronic element) including the low-voltage power supply transformer 111 is arranged below the transfer roller 7 shown in FIG. Accordingly, the center of gravity of the image forming apparatus A is positioned on the lower side. As a result, the influence of external vibration or the like can be reduced and the image forming apparatus A main body can be stabilized.

  Further, the low-voltage power source element portion 110 including the low-voltage power transformer 111 can be separated from the fixing device 9 shown in FIG. As a result, it is possible to suppress malfunctions due to the influence of heat generated in the fixing device 9. Further, even when heat is generated by the operation of the low-voltage power supply element 110, the air heated by the heat generation flows upward in FIG. 1 by natural convection in the space 19 formed between the conveyance guide 14 and the circuit board 100. . As a result, efficient exhaust heat can be obtained.

<Electromagnetic noise countermeasures>
Next, electromagnetic noise countermeasures of the image forming apparatus A will be described with reference to FIGS. 4 and 5. The circuit board 100 can also be an electromagnetic noise generation source that generates electromagnetic noise. The generation of electromagnetic noise affects not only the inside of the image forming apparatus A but also equipment outside the image forming apparatus A.

  In particular, as in the present embodiment, if the circuit board 100 is only fixed and supported by the conveyance guide 14 constituted by an integral resin mold that is a non-conductor, the shielding effect by the conductor cannot be expected. For this reason, there is a high possibility that electromagnetic noise generated from the circuit board 100 is radiated and spread to various places. In the present embodiment, a sheet metal 18 shown in FIGS. 1 and 3 is provided outside the circuit board 100 and has conductivity to shield electromagnetic noise generated from the circuit board 100.

  The metal plate 18 is fastened to the circuit board 100 and the conductive metal plate 52 shown in FIGS. 4 and 5 by a fixing member (not shown) such as a screw. The metal plate 18 and the metal plate 52 are connected to each other by an electrically conductive support stay 17 and an electrically conductive tension spring 17a so as to be energized.

  Accordingly, the sheet metal 18, the sheet metal 52, and the support stay 17 each having conductivity are configured as shield plates that cover the side surfaces in the four directions of the image forming apparatus A main body that are perpendicular to the installation surface of the image forming apparatus A. Is done. This shields electromagnetic noise. Thereby, electromagnetic noise from the outside of the image forming apparatus A does not affect the electrical operation of the circuit board 100. Further, electromagnetic noise generated from various power supply elements of the low-voltage power supply element unit 110 and the high-voltage power supply element unit 120 mounted on the circuit board 100 does not affect external devices and the like.

  4 and 5, the sheet metal 18, the sheet metal 52, and the image signal lines 150 and 151 that connect the connector unit 140 provided on the circuit board 100 and the laser scanner 3 as shield plates, It is arranged near the outside of the support stay 17. As a result, it is possible to suppress the electromagnetic noise generated from the various power supply elements of the low voltage power supply element unit 110 and the high voltage power supply element unit 120 mounted on the circuit board 100 from affecting the image signal lines 150 and 151. As a result, the electrical operation of the laser scanner 3 is not affected by electromagnetic noise.

<Comparative example>
Next, the configuration of the comparative example will be described with reference to FIGS. 9 and 10. FIG. 9 is a cross-sectional explanatory diagram illustrating a configuration of an image forming apparatus A of a comparative example. FIG. 10 is an explanatory perspective view showing the frame structure of the image forming apparatus A of the comparative example. In the image forming apparatus A of the comparative example shown in FIGS. 9 and 10, the recording material P passes through the conveying path R by the feeding roller 5, the conveying roller 11, and the registration roller 6 from the feeding tray 4 that stores the recording material P. And sent to the transfer nip portion N1. Then, the toner image formed on the surface of the photosensitive drum 8 is transferred to the recording material P by the transfer roller 7. Thereafter, the toner image transferred onto the recording material P is fixed by the fixing device 9. Thereafter, the recording material P is discharged onto the discharge tray 13 a by the discharge roller 10.

  The image forming apparatus A main body of the comparative example is also provided with a conveyance guide 14 that constitutes the conveyance path R. Further, in the image forming apparatus A main body of the comparative example, a support stay 17 for fixing and supporting the laser scanner 3 is provided so as to extend in parallel with the longitudinal direction of the image forming apparatus A main body (left and right direction in FIG. 9). ing.

  In addition, side plates 15 and 16 disposed opposite to each other are connected and supported at both ends in the longitudinal direction of the transport guide 14 and the support stay 17. A drive unit 50 is disposed outside the side plate 15, and a circuit board 100 is disposed outside the side plate 16. The low-voltage power supply element unit 110 and the high-voltage power supply element unit 120 mounted on the circuit board 100 protrude from the substrate surface 100a of the circuit board 100 toward the outside of the image forming apparatus A main body. When the circuit board 100 is arranged in this way, the image forming apparatus A is increased in size.

  In the present embodiment shown in FIG. 1, the circuit board 100 on which a plurality of electronic elements such as the low-voltage power supply element portion 110 and the high-voltage power supply element portion 120 are mounted is disposed on the back side of the main body of the image forming apparatus A and the installation surface of the image forming apparatus A. It is arranged substantially perpendicular to. Then, the low voltage power supply element portion 110 protruding from the substrate surface 100a of the circuit board 100, the tall power supply element of the high voltage power supply element portion 120, and the like are arranged to protrude forward of the image forming apparatus A toward the conveyance path R side. To do.

  These power supply elements are accommodated in a space 19 formed between the conveyance guide 14 and the circuit board 100. As a result, the main body of the image forming apparatus A is not enlarged in the front-rear direction (the left-right direction in FIG. 1). In comparison with the comparative example shown in FIG. 9 and FIG. 10, the image forming apparatus A can be downsized in the present embodiment.

  Next, the configuration of the second embodiment of the image forming apparatus according to the present invention will be described with reference to FIG. In addition, what was comprised similarly to the said 1st Embodiment attaches | subjects the same member name even if the same code | symbol or a code | symbol differs, and abbreviate | omits description. FIG. 8 is a cross-sectional explanatory view showing the configuration of the second embodiment of the image forming apparatus A according to the present invention. In the image forming apparatus A shown in FIG. 8, the apex T of the low-voltage power transformer 111 of the low-voltage power element 110 mounted on the circuit board 100 passes through the rotation center 7 d of the transfer roller 7, and reaches the substrate surface 100 a of the circuit board 100. It protrudes to the transport path R side (right side in FIG. 8) from the parallel surface V2.

  That is, a plane V2 that passes through the rotation center 7d of the transfer roller 7 serving as a conveyance rotating body provided in the conveyance path R and is parallel to the substrate surface 100a of the circuit board 100 is considered. The apex T of the low-voltage power transformer 111 that is the tallest electronic element among the plurality of electronic elements mounted on the circuit board 100 is disposed so as to protrude from the surface V2 toward the transport path R.

  As a result, the apex T of the low-voltage power transformer 111 of the low-voltage power element unit 110 mounted on the circuit board 100 further protrudes toward the transport path R than the first embodiment shown in FIG. As a result, the main body of the image forming apparatus A does not increase in size in the front-rear direction (the left-right direction in FIG. 8) even on the circuit board 100 on which the tall large low-voltage power transformer 111 is mounted.

  In the present embodiment, an example of the surface V2 passing through the rotation center 7d of the transfer roller 7 has been described. In addition to the rotation center 7 d of the transfer roller 7, the rotation center of the pressure roller 9 b and the rotation center of the roller on the side close to the circuit board 100 of the registration roller 6 are matched to various configurations of the image forming apparatus A. Consider the plane V2 through. Further, the apex T of the low-voltage power transformer 111 of the low-voltage power element unit 110 mounted on the circuit board 100 may be configured to protrude toward the transport path R from the surface V2. Other configurations are the same as those in the first embodiment, and the same effects can be obtained.

A ... Image forming apparatus P ... Recording material R ... Conveyance path 19 ... Space 100 ... Circuit board 110 ... Low voltage power supply element (low voltage power supply element)
120 ... High-voltage power supply element (high-voltage power supply element)

Claims (9)

A circuit board is provided substantially parallel to the recording material conveyance path,
An image forming apparatus, wherein an electronic element mounted on a circuit board is accommodated in a space formed between the conveyance path and the circuit board.   The image forming apparatus according to claim 1, wherein the circuit board is disposed on a back side of a main body of the image forming apparatus and substantially perpendicular to a mounting surface of the image forming apparatus.   Among the plurality of electronic elements mounted on the circuit board, the apex of the tallest electronic element passes through the closest part on the circuit board side of the transport rotating body provided in the transport path and 3. The image forming apparatus according to claim 1, wherein the image forming apparatus is disposed so as to protrude toward the conveyance path from a plane parallel to the substrate surface.   Among the plurality of electronic elements mounted on the circuit board, the apex portion of the tallest electronic element passes through the rotation center of the transport rotating body provided in the transport path and is parallel to the substrate surface of the circuit board. 3. The image forming apparatus according to claim 1, wherein the image forming apparatus is disposed so as to protrude toward a side of the conveyance path from a flat surface. The transport rotator is
The transfer roller for transferring the recording material, the transfer roller for transferring the toner image formed on the image carrier to the recording material, and the fixing roller for fixing the image on the recording material. The image forming apparatus according to claim 3 or 4.   The image forming apparatus according to claim 1, wherein the electronic element is a low-voltage power supply element.   The image forming apparatus according to claim 5, wherein the electronic element is disposed below the transfer roller.   The image forming apparatus according to claim 1, wherein an electronic element including a low-voltage power supply element and a high-voltage power supply element is integrally mounted on the circuit board.   An exposure device for forming an electrostatic latent image on the image carrier is disposed substantially perpendicular to the installation surface of the image forming device, and the exposure device and the substrate surface of the circuit board are disposed substantially in parallel. The image forming apparatus according to claim 1, wherein:

Images