JP2005229064A - Wiring board and power supply device for image forming apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact wiring board on which electric components can be forcedly mounted, and to provide a power supply device for an image forming apparatus which uses this wiring board. <P>SOLUTION: The both sides of a metallic board punched by a predetermined wiring pattern are coated with insulating composite resin so that a wiring board can be configured, and a holding part for mounting electronic components in a state where those electronic components are held is integrally formed on at least the surface of the wiring board. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wiring board suitably used in an image forming apparatus such as a full-color copying machine, printer, facsimile, or a composite machine to which an electrophotographic method is applied, and an image forming apparatus using the wiring board. The present invention relates to a wiring board that can be firmly attached and can be downsized, and a power supply device for an image forming apparatus using the wiring board.

JP 11-175195 A JP 2003-224346 A

  Conventionally, in a power supply device used in an image forming apparatus such as a full-color copying machine, printer, facsimile, or a composite machine to which this type of electrophotographic method is applied, the inlet and outlet are configured separately from the power supply board. These inlets / outlets and the power supply board are connected by electric wires or the like, and the inlet / outlet and the power supply board are each fixed to the apparatus main body with a bracket or the like.

  By the way, the inlet and outlet are subjected to external force during attachment and detachment, etc., so that the bracket for holding the inlet and the like needs mechanical strength, which has been an obstacle to downsizing the apparatus.

  In addition, if the power supply board is configured with a printed circuit board, a high-voltage current flows through the power supply board. Therefore, it is necessary to take a large creepage distance from the request for safety, which is also a bottleneck for miniaturization. .

  As technologies related to the power supply substrate, those disclosed in, for example, Japanese Patent Laid-Open Nos. 11-175195 and 2003-224346 have been proposed.

  As shown in FIG. 9, the power bus system of the tower building block system according to Japanese Patent Application Laid-Open No. 11-175195 discloses a configuration in which two power bus outlets are attached to the side surface of a printed wiring board.

  Further, the resin-molded wiring board according to the above-mentioned Japanese Patent Application Laid-Open No. 2003-224346 is a resin-molded wiring board in which both surfaces of an electric circuit board on which a circuit is formed are covered with a molding resin. The circuit board is provided with a circuit selection unit that selects a circuit formed on the circuit board depending on whether or not the circuit board is exposed and cut.

  However, the conventional technique has the following problems. That is, in the case of the power bus system of the tower building block system according to the above-mentioned JP-A-11-175195, as shown in FIG. 9, two power bus outlets are attached to the side surface of the printed wiring board. The problem is that the mechanical strength is not sufficient simply by attaching the power bus outlet to the side surface of the printed wiring board, and it cannot be applied to the image forming apparatus in which the inlet is attached to or detached from the outlet. Had.

  Further, in the case of the resin molded wiring board according to the above-mentioned Japanese Patent Application Laid-Open No. 2003-224346, it is a resin molded wiring board in which both surfaces of the circuit board on which the circuit is formed are covered with the molding resin, and the power supply board is a printed board. Although it is possible to reduce the size of the resin molded wiring board, it is necessary to mount a terminal block and the like by screwing, so that the work process is complicated and the inlet and outlet As described above, in the case of an electrical component in which a large force acts upon attachment / detachment, there is a problem that it is difficult to obtain sufficient mechanical strength.

  Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a wiring board capable of firmly attaching an electrical component and capable of being miniaturized, and the wiring board. Another object of the present invention is to provide a power supply device for an image forming apparatus using the above.

  In order to solve the above-mentioned problem, the invention described in claim 1 constitutes a wiring board by covering both front and back surfaces of a metal plate punched according to a predetermined wiring pattern with an insulating synthetic resin, The wiring board is characterized in that a holding portion for attaching the electric component in a state of holding the electric component is integrally provided on at least a surface of the wiring board.

  According to a second aspect of the present invention, there is provided a wiring board by covering both front and back surfaces of a metal plate punched according to a predetermined wiring pattern with an insulating synthetic resin, and at least a surface of the wiring board. In addition, the wiring board is characterized in that electrical components are integrally provided.

  Furthermore, in the invention described in claim 3, a part of the surface side of the metal plate is exposed, and a ground electrode part is formed on a part of the exposed metal plate, and the ground electrode The wiring board according to claim 1, wherein the portion is directly connected to the grounding member.

  According to a fourth aspect of the present invention, the electric component includes an operation member operable from the outside, and the operation member is formed integrally with at least one surface of the wiring board. The wiring board according to claim 2 or 3, characterized in that

  Furthermore, the invention described in claim 5 is the wiring board according to claim 4, wherein at least a part of the operation member is formed integrally with the wiring board.

  According to a sixth aspect of the present invention, in the wiring board according to the fourth aspect, the operation member is fixed to the cover member by an engagement piece provided on the wiring board. It is.

  The invention described in claim 7 is the wiring board according to claim 4, wherein the operation member is a connector.

  The invention described in claim 8 is the wiring board according to claim 4, wherein the operation member is a switch.

Furthermore, the invention described in claim 9 is a power supply device used in an image forming apparatus having a fixing device having a heat source.
9. The wiring board according to claim 1, wherein a primary side circuit for inputting AC power to the image forming apparatus and a fixing unit for supplying AC power to the fixing unit are used on the wiring board. A power supply device for an image forming apparatus, wherein a power supply circuit is integrally formed.

According to a tenth aspect of the present invention, there is provided a power supply device for use in an image forming apparatus having a fixing device having a heat source.
9. A power supply device for an image forming apparatus, wherein the wiring substrate according to claim 1 is used, and the wiring substrate is provided integrally with a fixing device.

  According to the present invention, it is possible to provide a wiring board on which electrical components can be firmly attached and which can be reduced in size, and a power supply device for an image forming apparatus using the wiring board.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1
FIG. 2 shows a four-cycle full-color printer as an image forming apparatus to which the wiring board according to Embodiment 1 of the present invention and a power supply device for an image forming apparatus using the wiring board are applied.

  In FIG. 2, reference numeral 1 denotes a main body of a full-color printer. Inside the full-color printer main body 1, a photosensitive drum 2 as an image carrier is rotatably disposed at a slightly upper right portion from the center. ing. As this photosensitive drum 2, for example, a drum made of a conductive cylinder having a diameter of about 47 mm whose surface is coated with a photosensitive layer made of OPC or the like is used. It is rotationally driven at a process speed of about 150 mm / sec. The surface of the photosensitive drum 2 is charged to a predetermined potential by a charging roll 3 serving as a charging unit disposed almost directly below the photosensitive drum 2, and then at a position just below the photosensitive drum 2. Image exposure with a laser beam (LB) is performed by a ROS 4 (Raster Output Scanner) as the arranged exposure means, and an electrostatic latent image corresponding to image information is formed. The electrostatic latent image formed on the photosensitive drum 2 passes through the developing devices 5Y, 5M, 5C, and 5K of yellow (Y), magenta (M), cyan (C), and black (K) in the circumferential direction. The toner is developed by a rotary developing device 5 arranged along the toner image to form a toner image of a predetermined color.

  At this time, charging, exposure and development processes are repeated a predetermined number of times on the surface of the photosensitive drum 2 in accordance with the color of the image to be formed. In the rotary developing device 5, the corresponding color developing devices 5 </ b> Y, 5 </ b> M, 5 </ b> C, and 5 </ b> K move to a developing position facing the photosensitive drum 2. For example, when a full-color image is formed, the charging, exposure, and development processes are performed on the surface of the photosensitive drum 2 in yellow (Y), magenta (M), cyan (C), and black (K) colors. The toner image corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (K) is sequentially formed on the surface of the photosensitive drum 2. . The number of rotations of the photosensitive drum 2 when the toner image is formed varies depending on the size of the image. For example, in the case of A4 size, one image can be obtained by rotating the photosensitive drum 2 three times. It is formed. In other words, each time the photosensitive drum 2 rotates three times, toner images corresponding to yellow (Y), magenta (M), cyan (C), and black (K) colors are sequentially formed on the surface of the photosensitive drum 2. It is formed.

  The yellow (Y), magenta (M), cyan (C), and black (K) toner images sequentially formed on the photosensitive drum 2 are intermediately provided on the outer periphery of the photosensitive drum 2 as an intermediate transfer member. At the primary transfer position around which the transfer belt 6 is wound, the primary transfer is performed by the primary transfer roll 7 while being superimposed on the intermediate transfer belt 6. The yellow (Y), magenta (M), cyan (C), and black (K) toner images transferred in multiple onto the intermediate transfer belt 6 are recorded on the recording paper 9 fed at a predetermined timing. Secondary transfer is collectively performed by the secondary transfer roll 8. The recording paper 9 is fed by a pickup roll 11 from a paper feed cassette 10 disposed at the lower part of the full-color printer main body 1, and is fed in a state where it is rolled one by one by a feed roll 12 and a retard roll 13. The roller 14 is conveyed to the secondary transfer position of the intermediate transfer belt 6 in synchronization with the toner image transferred onto the intermediate transfer belt 6.

  The intermediate transfer belt 6 is stretched by a plurality of rolls, and is driven as the photosensitive drum 2 rotates, for example, so as to circulate at a predetermined process speed (about 150 mm / sec). The intermediate transfer belt 6 intermediately transfers a wrap-in roll 15 that specifies the wrap position of the intermediate transfer belt 6 on the upstream side in the rotational direction of the photosensitive drum 2 and a toner image formed on the photosensitive drum 2. The primary transfer roll 7 to be transferred onto the belt 6, the wrap-out roll 16 for specifying the wrap position of the intermediate transfer belt 6 on the downstream side of the wrap position, and the secondary transfer roll 8 are in contact with each other via the intermediate transfer belt 6. The backup roll 17, the first cleaning backup roll 19 facing the cleaning device 18 of the intermediate transfer belt 6, and the second cleaning backup roll 20 are stretched with a predetermined tension.

  Further, as described above, the intermediate transfer belt 6 is stretched by a plurality of rolls 7, 15-17, 19, and 20. In this embodiment, in order to reduce the size of the full-color printer body 1, The cross-sectional shape on which the intermediate transfer belt 6 is stretched is configured to be a flat and elongated substantially trapezoidal shape.

  Furthermore, in this embodiment, as shown in FIG. 2, the entire full-color printer is miniaturized as much as possible, but the rotary developing device 5 occupies a large space of the full-color printer main body 1. Therefore, the full-color printer main body 1 is designed to improve the maintainability of the intermediate transfer belt 6 and the rotary developing device 5 while achieving downsizing of the device. Specifically, the intermediate transfer belt 6 includes an image forming unit 21 including the photosensitive drum 2 and the charging roll 3, and the upper cover 22 of the full-color printer main body 1 is opened to open the intermediate transfer belt 6. The entire image forming unit 21 is configured to be detachable from the full-color printer main body 1. A position sensor 23 composed of a reflective photosensor for detecting a toner patch formed on the intermediate transfer belt 6 is disposed on the intermediate transfer belt 6.

  Further, as shown in FIG. 2, the cleaning device 18 for the intermediate transfer belt 6 includes a scraper 24 disposed so as to abut on the surface of the intermediate transfer belt 6 stretched by a first cleaning backup roll 19; A cleaning brush 25 disposed so as to be in pressure contact with the surface of the intermediate transfer belt 6 stretched by the second cleaning backup roll 20, and residual toner and paper dust removed by the scraper 24 and the cleaning brush 25 Is collected in the cleaning device 18. The cleaning device 18 is disposed so as to be able to swing counterclockwise around the swing shaft 26. Until the secondary transfer of the final color toner image is completed, the intermediate transfer is performed. The belt 6 is retracted to a position separated from the surface of the belt 6 and is configured to come into contact with the surface of the intermediate transfer belt 6 when the secondary transfer of the final color toner image is completed.

  Further, the recording paper 9 onto which the toner image is transferred from the intermediate transfer belt 6 is conveyed to a fixing device 27 as shown in FIG. 2, and the toner image is transferred onto the recording paper 9 by heat and pressure by the fixing device 27. In the case of single-sided printing, the paper is discharged as it is onto a discharge tray 29 provided at the top of the printer body 1 by a discharge roll 28.

  By the way, as shown in FIG. 2, the fixing unit 27 presses the heating roll 27a and the pressure roll 27b, and a single halogen lamp 27c as a heating source disposed inside the heating roll 27a. By heating the surface of the heating roll 27a to a predetermined temperature and passing the recording paper 9 carrying the unfixed toner image through a nip formed between the heating roll 27a and the pressure roll 27b, And the toner image is fixed on the recording paper 9 by pressure.

  Further, as will be described later, the halogen lamp 27c of the fixing device 27 is configured to be supplied with predetermined AC power by a power supply device using the wiring board according to this embodiment.

  On the other hand, in the case of double-sided printing, the recording paper 9 on which the toner image is fixed by the fixing device 27 is not discharged as it is onto the discharge tray 29 by the discharge roll 28, but the rear end portion of the recording paper 9 by the discharge roll 28. In a state where the discharge roll 28 is reversed, the conveyance path of the recording paper 9 is switched to the double-sided paper conveyance path 30, and the conveyance roll 31 disposed in the double-sided paper conveyance path 30 With the recording paper 9 turned upside down, the recording paper 9 is conveyed again to the secondary transfer position of the intermediate transfer belt 6 to form an image on the back surface of the recording paper 9.

  Furthermore, as shown in FIG. 2, a manual feed tray 32 can be attached to the side surface of the printer main body 1 so as to be freely opened and closed in the full color printer. An arbitrary size and type of recording paper 9 placed on the manual feed tray 32 is fed by a paper feed roll 33, and a secondary transfer position of the intermediate transfer belt 6 via a transport roll 31 and a registration roll 14. As a result, the image can be formed on the recording paper 9 of any size and type.

  It should be noted that the surface of the photosensitive drum 2 after the toner image transfer process is completed is cleaned by a cleaning blade 35 of a cleaning device 34 disposed obliquely below the photosensitive drum 2 every time the photosensitive drum 2 rotates once. As a result, residual toner and the like are removed to prepare for the next image forming process.

  Thus, in this embodiment, the front and back surfaces of the metal plate punched according to a predetermined wiring pattern are covered with an insulating synthetic resin to constitute a wiring board, and at least on the surface of the wiring board, The holding part for attaching in the state which hold | maintained the electrical component is comprised so that it may provide integrally.

  In addition, you may comprise so that an electrical component may be integrally provided in the at least surface of the said wiring board.

  Further, in this embodiment, a part of the surface side of the metal plate is exposed, a ground electrode part is formed on the exposed metal plate, and the ground electrode part is directly grounded. It is comprised so that it may connect with a member.

  Further, in this embodiment, the electric component includes an operation member operable from the outside, and the operation member is configured to be formed integrally with at least one surface of the wiring board.

  In this embodiment, the operation member is configured to be fixed to the cover member by an engagement piece provided on the wiring board.

  Further, in this embodiment, in the power supply device used in the image forming apparatus having the fixing device having the heat generation source, the wiring board configured as described above is used, and the wiring board is AC connected to the image forming apparatus. A primary circuit for inputting electric power and a power supply circuit for a fixing device for supplying AC power to the fixing device are integrally configured.

  FIG. 3 shows a power supply device for an image forming apparatus to which the wiring board according to this embodiment is applied.

  In FIG. 3, reference numeral 40 denotes a power supply device for the image forming apparatus. The power supply device 40 for the image forming apparatus includes, for example, a front panel 1a of the printer main body 1 as shown in FIGS. An engagement piece 45 provided at the corner of the side panel 1b and fixed by screws with three screws 41 to 43, and protruding from the corner of the wiring board 44 of the power supply device 40, It is attached by engaging with the frame 46 of the printer main body 1. The power supply device 40 for the image forming apparatus includes a wiring board 44 according to the present embodiment, and a power supply circuit 47 as shown in FIG. 4 is mounted on the wiring board 44.

  As shown in FIG. 4, the power supply circuit 47 includes a primary circuit 48 for inputting AC power to the printer and a power supply circuit 49 for the fixing device that supplies AC power to the fixing device 27. Yes. The power supply circuit 47 has an inlet 50 as an operation member to which power such as AC100V or AC200V is supplied from an external power supply, and one of the power lines supplied through the inlet 50 has a fuse F1. In addition, it is connected to terminals 1 to 3 of the output terminal P2 of the primary side circuit 48 for inputting AC power to the printer as it can be turned ON / OFF by a switch SW as an operation member. One of the power lines supplied via the inlet 50 is output as the terminal 1 of the output terminal P3 in a state where it can be turned ON / OFF by the relay K1.

  The other of the power lines supplied via the inlet 50 is connected to the inductance L1 through the switch SW, and the other end of the inductance L1 is directly output as the terminal 4 of the output terminal P2. ing. Further, the other end of the inductance L1 is connected to a capacitor C1 connected in series and an output terminal P3 2 connected to the halogen lamp of the fixing device 27 via a resistor R1, and the capacitor C1 and The resistor R1 is connected in parallel with a triac Q1 that turns on / off the energization of the halogen lamp of the fixing unit. A capacitor C2 and a resistor R2 are connected in parallel between the gate terminal of the triac Q1 and one terminal, and the gate terminal of the triac Q1 is connected to the halogen of the fixing device via the resistor R3. A signal for turning on / off the lamp is input from the terminal 6.

  In this embodiment, since there is only one halogen lamp of the fixing device, only one triac Q1 for turning on / off the halogen lamp of the fixing device is mounted. In the case of two, a pair of triacs Q2 and the like may be provided as shown in FIG.

  Thus, when two halogen lamps are used, the inrush current can be reduced by connecting a current limiting resistor to the terminal P4 and turning on the triac Q2 → Q1, as shown in FIG. .

  The solenoid of the relay K1 is configured so that a voltage is applied ON / OFF from the terminal P1 via the diode CR1.

  As shown in FIG. 1, for example, the wiring board 44 is formed of a copper plate 51 as a metal plate having a thickness of 0.3 mm with Sn (tin) plating on both front and back surfaces, as shown in FIG. The wiring circuit 52 is formed by punching in accordance with the above. The wiring circuit 52 is formed by punching a copper plate according to a predetermined wiring pattern by press working. However, since the wiring circuit 52 is separated from each other, each wiring part is connected to a connecting portion at the time of punching. 53. When connecting a pair of metal molds, the connecting portion 53 is cut when a pair of molds are crimped during or after molding a synthetic resin, which will be described later, to form a predetermined wiring circuit 52. It is supposed to be.

  Further, as shown in FIGS. 1 and 6, the wiring board 44 is filled with insulating synthetic resins 54 and 55 such as glass fibers on both the front and back surfaces and the outer periphery of the copper plate 51 punched according to a predetermined wiring pattern. Further, it is coated to a predetermined thickness with a synthetic resin such as PET (polyethylene terephthalate). The thickness covering the insulating synthetic resins 54 and 55 is set such that the front side of the copper plate 51 punched out according to a predetermined wiring pattern is 1.3 mm and the back side is 1.2 mm. The reason why the surface is covered slightly thick in this way is because the electrical components constituting the power supply circuit 47 are mounted on the surface side, and therefore the insulation between the electrical components is taken into consideration.

  Further, as shown in FIG. 1 and FIG. 11, a holding portion 56 for attaching the inlet 50 as an operation member to the surface of the wiring board 44 has an insulating property for forming the wiring board 44. The synthetic resin 54 is provided integrally. The holding portion 56 of the operation member is formed by left and right holding walls 56a and 56b and a bottom wall 56c surrounding the left and right and bottom surfaces of the inlet, and the inlet 50 is fitted into the left and right holding walls 56a and 56b of the holding portion 56. By doing so, it is configured to be firmly held and fixed. The holding portion 56 may be configured to be able to hold and fix the operation member more firmly by providing an engagement portion that engages with the operation member such as the inlet 50.

  Further, as shown in FIG. 1, a holding portion 57 for attaching the switch SW as an operation member to the surface of the wiring board 44 is provided with an insulating synthetic resin 54 that forms the wiring board 44. Are integrally provided. The holding member 57 of the operation member is formed by left and right holding walls 57a, 57b and a back wall 57c surrounding three sides of the switch SW. The switch SW is connected to the three holding walls 57a, 57b, 57c of the holding unit 57. In addition to being fitted, it is configured to be firmly held and fixed by engaging with a protrusion 57d provided on the back wall 57c.

  Further, as shown in FIG. 6, the triac Q1 mounted on the surface of the wiring board 44, the resistors R1 and R2, or the electric components such as the capacitors C1 and C2 are fixed to the surface of the wiring board 44. A large number of small insertion holes 61 are formed to allow the projections 58 to 60, the triac Q1, and the terminals of electrical components such as the resistors R1 and R2 or the capacitors C1 and C2 to pass through to the back side.

  Further, as shown in FIG. 6, a part 51a on the surface side of the metal plate 51 is exposed on the surface of the wiring board 44, and the exposed metal plate 51a forms a grounding electrode portion. Yes. The grounding electrode portion 51a is provided with a screw-fastening hole 62. When the wiring board 44 is fastened to a predetermined position of the printer main body 1 as shown in FIG. It is configured so that it can be directly connected to the grounding member 63 of the frame by a fixing screw 41.

  Further, on the back surface of the wiring board 44, as shown in FIG. 6 (b), in order to ensure insulation between wirings to which AC 100V or AC 200V power is supplied from the inlet 50, a flat plate-like shape that increases the creepage distance. The protrusion 64 is provided so as to protrude toward the back side.

  Furthermore, on the back surface of the wiring board 44, as shown in FIG. 6B, a wiring circuit 52 in which a copper plate 51 is punched into a predetermined pattern is connected to an inlet 50, a triac Q1, resistors R1, R2 or a capacitor C1, In order to connect an electrical component such as C2 by soldering or the like, an opening having a desired shape such as a circular shape or an elliptical shape for exposing a part of the wiring circuit 52 to the back surface side is provided. In FIG. 6B, reference numeral 66 denotes a rectangular opening for cutting the connecting portion 53 described above.

  In the above configuration, in the full color printer as the image forming apparatus to which the power supply device for the image forming apparatus according to this embodiment is applied, the electrical components can be firmly attached and the size can be reduced as follows. It is possible.

  That is, in the power supply device for an image forming apparatus according to this embodiment, as shown in FIG. 1, the power supply circuit 47 is formed by punching a metal plate 51, and the metal plate 51 is formed of an insulating synthetic resin 54, Since the wiring board 44 and the power supply device are configured by covering both surfaces in a state of being sandwiched by 55, the pattern is insulated by the insulating synthetic resins 54 and 55 as compared with the conventional printed circuit board, and the so-called creepage distance is increased. This eliminates the need to reduce the size and cost. Moreover, since the circuit pattern is covered with the insulating synthetic resins 54 and 55, it can contribute to avoiding a short circuit accident due to dust prevention and foreign object contact.

  Further, in the power supply device for an image forming apparatus according to this embodiment, as shown in FIG. 1, a part 51a on the surface side of the metal plate 51 is exposed, and the exposed metal plate 51a is used for grounding. Since the electrode portion is formed, the circuit can be easily grounded.

  Further, in the power supply device for an image forming apparatus according to this embodiment, as shown in FIG. 4, the primary circuit 48 of the power supply and the power supply circuit 49 of the fixing device 27 are integrated, so that safety is improved. And contribute to cost reduction.

  Further, in the power supply device for an image forming apparatus according to this embodiment, as shown in FIG. 1, the holding portions 56 and 57 for holding operation members such as the inlet 50 and the switch SW to which external force is applied constitute the power supply device. Because it is formed integrally with the synthetic resin molded product to be used, individual brackets and the like are unnecessary, contributing to downsizing and cost reduction, and it is possible to firmly attach operation members such as the inlet 50 and the switch SW, There is no rattling or moving.

  Further, in the power supply device for an image forming apparatus according to this embodiment, as shown in FIGS. 1 and 11, holding portions 56 and 57 for holding operation members such as an inlet 50 to which an external force is applied and a switch SW are provided. Since it is formed integrally with the synthetic resin molding that constitutes the device and the engaging part is provided in the holding part 57, it is reliably prevented from rattling or moving without providing an individual bracket or the like. can do.

  Further, in the power supply apparatus for an image forming apparatus according to the present embodiment, as shown in FIG. 1, there is no need to separately provide a holder such as a bracket by connecting / disconnecting a connector or turning on / off a switch SW. It is possible to reliably prevent it from being attached or moved.

Embodiment 2
FIG. 7 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and this second embodiment relates to the embodiment. The power supply device 40 for the image forming apparatus is configured to be provided integrally with the fixing device of the image forming apparatus.

  That is, in the second embodiment, as shown in FIG. 7, the power supply device 40 for the image forming apparatus is provided integrally with the fixing device 27 of the printer. As shown in FIG. 2, the fixing device 27 of the printer is usually provided at the upper part on the back side of the printer main body 1, and therefore, the power supply device 40 for the image forming apparatus is integrated with the fixing device 27 of the printer. As a result, the wiring to the fixing device 27 becomes unnecessary, and as shown in FIG. 8, the layout of the power supply device 40 such as the arrangement of the power cord 70 and the switch SW connected to the inlet 50 is convenient. .

The printer fixing device 27 may be a 100V fixing device, a 200V fixing device, or the like depending on the model. The power supply device 40 for the image forming apparatus is provided integrally with the fixing device 27. Accordingly, it is possible to prevent in advance from causing a problem such as a lamp burnout by erroneously assembling a 100V fixing device to a 200V power supply device.
Since other configurations and operations are the same as those of the above-described embodiment, description thereof is omitted.

1 is an exploded perspective view showing a power supply apparatus for an image forming apparatus to which a wiring board according to Embodiment 1 of the present invention is applied. FIG. 2 is a configuration diagram showing a full-color printer as an image forming apparatus to which the wiring board and the power supply device for the image forming apparatus according to Embodiment 1 of the present invention are applied. FIG. 3 is an exploded configuration diagram showing a mounting state of the power supply device for the image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied. 4 is a circuit diagram showing a power supply device for an image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied. FIG. 5 is a configuration diagram showing a power supply device for an image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied. FIG. 6 is a configuration diagram showing a power supply device for an image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied. FIG. 7 is an external perspective view showing a fixing device to which a power supply device for an image forming apparatus according to Embodiment 2 of the present invention is applied. FIG. 8 is an external perspective view showing a printer to which the power supply device for an image forming apparatus according to Embodiment 1 of the present invention is applied. FIG. 9 is an external perspective view showing a conventional apparatus. FIG. 10 is a circuit diagram showing a modification of the power supply device for the image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied. FIG. 11 is an exploded perspective view showing the inlet portion of the power supply device for the image forming apparatus to which the wiring board according to the first embodiment of the present invention is applied.

Explanation of symbols

  40: Power supply device for image forming apparatus, 44: Wiring board, 47: Power supply circuit, 50: Inlet, SW: Switch, 54, 55: Insulating synthetic resin.

Claims (10)

A wiring board is configured by covering both front and back surfaces of a metal plate punched in accordance with a predetermined wiring pattern with an insulating synthetic resin, and for attaching an electrical component to at least the surface of the wiring board in a state of being held. A wiring board characterized in that a holding portion is provided integrally. A wiring board is formed by covering both front and back surfaces of a metal plate punched in accordance with a predetermined wiring pattern with an insulating synthetic resin, and electrical components are integrally provided on at least the surface of the wiring board. A characteristic wiring board. A part of the surface side of the metal plate is exposed, a ground electrode part is formed on a part of the exposed metal plate, and the ground electrode part is directly connected to the ground member. The wiring board according to claim 1 or 2, wherein 4. The wiring according to claim 2, further comprising an operation member operable from outside as the electrical component, wherein the operation member is formed integrally with at least one surface of the wiring board. substrate. The wiring board according to claim 4, wherein at least a part of the operation member is formed integrally with the wiring board. The wiring board according to claim 4, wherein the operation member is fixed to the cover member by an engagement piece provided on the wiring board. The wiring board according to claim 4, wherein the operation member is a connector. The wiring board according to claim 4, wherein the operation member is a switch. In a power supply device used in an image forming apparatus having a fixing device having a heat source,
9. The wiring board according to claim 1, wherein a primary side circuit for inputting AC power to the image forming apparatus and a fixing unit for supplying AC power to the fixing unit are used on the wiring board. A power supply device for an image forming apparatus, wherein the power supply circuit is integrally formed. In a power supply device used in an image forming apparatus having a fixing device having a heat source,
9. A power supply device for an image forming apparatus, wherein the wiring substrate according to claim 1 is used and the wiring substrate is provided integrally with a fixing device.

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