JP2017120925A - Printed circuit board, device, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the area required for a contact part to reduce a force required during assembly, and easily perform visual check of the contact part.SOLUTION: There is provided a printed circuit board 101 on which a circuit generating voltage is mounted, the printed circuit board comprising a slit 104 that penetrates through the printed circuit board 101 and a jumper wire 103 that is provided across the slit 104 and applied with a voltage, when attached to a charging part 317 to which an arm part 202 of a helical torsion coil spring having elasticity is connected, an arm part 203 of the helical torsion coil spring passing through the slit 104 comes into contact with the jumper wire 103, and thereby a voltage is supplied to the charging part 317 via the helical torsion coil spring.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a printed circuit board and an image forming apparatus including the printed circuit board.

  An image forming apparatus such as a laser beam printer includes a charging device, a developing device, a transfer device, a fixing device, and the like. The charging device is a device for charging a charge on the photosensitive drum, the developing device is a device for developing a latent image formed on the photosensitive drum with a laser beam or the like with toner, and the transfer device is developed. An apparatus for transferring a toner image on a photosensitive drum to a transfer material. Further, the fixing device is a device that includes a heater or the like driven by an AC power source, and heats and fixes the toner image transferred to the transfer material onto the transfer material.

  A high voltage of several hundred volts to several kilovolts is applied to the charging device, the developing device, and the transfer device. In order to supply a high voltage to these devices, the image forming device applies a high voltage on the printed circuit board. A high voltage power supply substrate having a high voltage power supply circuit to be generated is provided. In order to apply the high voltage generated by the high-voltage power supply board to the charging device, developing device, and transfer device, connecting the high-voltage power supply substrate and the image forming apparatus main body with a high-voltage cable results in low assembly and further increases the cost of the high-voltage cable. It takes. Therefore, for example, Patent Document 1 proposes a method of connecting a high voltage power supply substrate and an image forming apparatus main body without using a high voltage cable. That is, a contact portion having electrical conductivity is provided on the high-voltage power supply substrate, and a coil-shaped spring member is provided on the image forming apparatus main body side, and the high-voltage power supply substrate is assembled to the image forming apparatus main body. As a result, the contact portion on the high-voltage power supply substrate comes into contact with the coiled spring member on the image forming apparatus main body side, and a high voltage is applied to the image forming apparatus main body side. Further, in Patent Document 1, after the high-voltage power supply board is assembled to the main body of the image forming apparatus, a hole for confirming whether the spring member is in contact with the contact portion of the high-voltage power supply board is provided, and the state of the contact is visually checked. It can be confirmed with

JP 2002-158408 A

  However, in the method of connecting the printed circuit board of the high voltage power source in the image forming apparatus described above and the high voltage input contact on the apparatus side with a coiled spring member, when the diameter of the coil portion of the spring member is reduced, The area in contact with the printed circuit board is reduced. Therefore, when the printed circuit board is pressed against the spring member and fixed, the contact state becomes unstable, and the spring member is likely to be deformed. If the coil portion of the spring member is deformed, the coil portion cannot be accurately contacted with the circuit pattern on the printed circuit board side, so that the diameter of the coil portion cannot be easily reduced. As a result, there is a problem that the ratio of the area occupied by the contacts to the entire printed circuit board increases, leading to an increase in the board area. In addition, there are often multiple locations where the printed circuit board of the high-voltage power supply and the image forming apparatus main body are connected. Has been. When assembling a printed board with a high-voltage power supply to the image forming device main body, the printed board receives the repulsive force of the spring member directly, and as the number of contact points increases, a stronger force is required when assembling. There is a problem that is low.

Furthermore, depending on the size and material of the printed circuit board and the number of contacts, the printed circuit board itself is deflected by the repulsive force of the spring member, and there is a problem that stress is applied to the components mounted on the printed circuit board due to this deflection. Moreover, when the contact state is visually confirmed through a hole for visual confirmation as in Patent Document 1 described above, a part of the spring member can be visually confirmed. However, there is a problem that it cannot be visually confirmed whether the contact portion of the printed circuit board and the coil of the spring member are in reliable contact.

  The present invention has been made under such circumstances, and it is an object of the present invention to reduce the area required for the contact portion, reduce the force required for assembly, and facilitate visual confirmation of the contact portion.

  In order to solve the above-described problems, the present invention is configured as follows.

  (1) A printed circuit board on which a circuit for generating a voltage is mounted, wherein the first contact member is provided across a through hole penetrating the printed circuit board and the through hole, and the voltage is applied to the printed circuit board. The first contact member and the other end of the second contact member that has passed through the through hole are attached to an attached body to which one end of the second contact member having elasticity is connected. A printed circuit board, wherein the printed circuit board abuts and the voltage is supplied to the attached body through the second contact member.

  (2) An image carrier on which an electrostatic latent image is formed, charging means for charging the image carrier with a predetermined potential, and developing the electrostatic latent image on the image carrier with toner to form a toner image. An image forming apparatus comprising: a developing unit that performs transfer; a transfer unit that transfers a toner image of the image carrier to a sheet; and the printed circuit board according to (1).

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the area required for a contact part and making a force required at the time of an assembly small, visual confirmation of a contact part can be performed easily.

Schematic configuration diagram showing the configuration of the image forming apparatus of Examples 1 to 5 The figure which shows the structure of the contact on the printed circuit board of Example 1, and the state of the contact before and behind the attachment to an apparatus. The figure explaining the difference of the structure of the contact of Example 2, and the slit of Example 1,2. The figure explaining the structure of the contact of Example 3, and the directionality of the force applied to a contact The figure which shows the structure of the contact of Example 4, and the shape of a torsion coil spring The figure which shows the structure of the contact of Example 5.

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

[Configuration of Image Forming Apparatus]
A laser beam printer will be described as an example of the image forming apparatus according to the first exemplary embodiment. FIG. 1 shows a schematic configuration of a laser beam printer which is an example of an electrophotographic printer. The laser beam printer 300 includes a photosensitive drum 311 that is an image carrier on which an electrostatic latent image is formed, a charging unit 317 (charging unit) that charges the photosensitive drum 311 at a predetermined potential, and an electrostatic formed on the photosensitive drum 311. A developing unit 312 (developing unit) that develops the latent image with toner is provided. The toner image developed on the photosensitive drum 311 is transferred to a sheet (not shown) as a recording material supplied from the cassette 316 by a transfer unit 318 (transfer means), and the toner image transferred to the sheet is fixed to the fixing device 314. Then, the toner is fixed and discharged onto the tray 315. The photosensitive drum 311, the charging unit 317, the developing unit 312, and the transfer unit 318 are image forming units. The laser beam printer 300 includes a power supply device 400. Although the image forming apparatus shown in FIG. 1 includes one image forming unit, the image forming apparatus to which the present embodiment is applied is not limited to the one illustrated in FIG. An image forming apparatus provided with a unit may be used. Further, the image forming apparatus may include a primary transfer unit that transfers the toner image on the photosensitive drum 311 to the intermediate transfer belt and a secondary transfer unit that transfers the toner image on the intermediate transfer belt to the sheet.

  The laser beam printer 300 includes a controller (not shown) that controls an image forming operation by the image forming unit and a sheet conveying operation. The power supply apparatus 400 supplies power to the controller, for example. Further, the power supply apparatus 400 supplies power to a driving unit such as a motor for rotating the photosensitive drum 311 or driving various rollers for conveying the sheet. The charging unit 317, the developing unit 312, and the transfer unit 318 are each provided with a high-voltage power supply printed circuit board (hereinafter also referred to as a high-voltage power supply substrate) that generates a high voltage. The high voltage sometimes required is supplied.

[Composition of contact part]
FIG. 2 is a diagram for explaining a contact portion between a charging high-voltage output portion of a high-voltage power supply substrate that supplies a high voltage to the charging portion 317 and a spring member that is a conductive member that conducts the high voltage to the charging portion 317 in this embodiment. It is. In the following, a high voltage power supply substrate that supplies a high voltage to the charging unit 317 will be described as an example, but other high voltage power supply units such as a development high voltage output unit that supplies a high voltage to the developing unit 312 and a transfer unit 318 are described. The transfer high-voltage output unit for supplying a high voltage has the same configuration. In addition, when a high voltage is applied, there are the following. For example, when a roller-shaped transfer roller (not shown) is used as the transfer portion, a high voltage for removing (cleaning) toner as a developer attached to the transfer roller is applied to the transfer roller. Further, a static elimination voltage (high voltage) for separating the sheet on which the image has been transferred by the transfer roller and the photosensitive drum from the photosensitive drum is applied to a static eliminator (not shown). Further, a high voltage is applied to a sensor (sheet metal) provided in the toner storage container in order to detect the remaining amount of toner in the storage container that stores the toner. Further, a high voltage is applied to a blade as a toner charging member for charging the toner during development. In the case of the configuration of the color image forming apparatus, a high voltage is applied to a primary transfer roller as a primary transfer unit when the toner image is primarily transferred from the photosensitive drum to the intermediate transfer member. In addition, when the toner image is secondarily transferred from the intermediate transfer member to the sheet, a high voltage is applied to a secondary transfer roller as a secondary transfer portion.

  FIG. 2A shows a jumper wire 103 which is a charging high voltage output section provided on a printed circuit board 101 which is a high voltage power supply board, and a printed circuit board 101 which is a torsion coil spring which is a spring member which conducts a high voltage to the charging section 317. It is a perspective view which shows a contact part with the arm part 203 of the side. In FIG. 2A, a jumper wire 103 as a first contact member is a slit 104 which is a through hole (also referred to as a notch) provided through the component surface 105 and the solder surface 106 of the printed circuit board 101. It is provided across. A power supply circuit (not shown) on the printed circuit board 101 is connected to the jumper line 103, and a high voltage generated by the power supply circuit is applied to the jumper line 103. The jumper wire 103 is provided on the component surface 105 side on which circuit components are mounted. The leg of the jumper wire 103 (not shown) penetrates the component surface 105 and the solder surface 106 of the printed circuit board 101. Yes. Therefore, the jumper wire 103 may be connected to a power circuit (not shown) on the component surface 105 side or the solder surface 106 surface side. Further, if the jumper wire 103 is connected to a power supply circuit (not shown) on the surface where the jumper wire 103 is provided, the leg of the jumper wire does not necessarily have to penetrate the printed circuit board 101.

Furthermore, in the following embodiments, the jumper wire 103 is mounted on the component surface 105 side, but may be mounted on the solder surface 106 side, which is the surface of the component surface 105 opposite to the printed circuit board 101.

  Hereinafter, the component surface 105 and the solder surface 106 are simply referred to as a surface 105 and a surface 106. Furthermore, the surface 105 may be a solder surface and the surface 106 may be a component surface, or a single-sided substrate in which the component surface and the solder surface are the surfaces 105 or 106 may be used.

  Further, the pressure 501 indicated by the arrow in the drawing is a pressure parallel to the surfaces 105 and 106 of the printed circuit board 101 applied when the arm portion 203 of the torsion coil spring as the second contact member contacts the jumper wire 103. Indicates the direction. Also, symbols A, B, C, and D in FIG. 2A are attached to show the correspondence of the positions of the printed circuit boards 101 in FIGS. 2B and 2C.

[Attaching the printed circuit board to the device]
FIGS. 2B and 2C are views showing the state of the contact portion before and after attaching the printed circuit board 101 to an apparatus (an electrical apparatus apparatus including an image forming apparatus is simply referred to as an apparatus) as an attachment body. . FIG. 2B shows a state before the printed board 101 is assembled to the apparatus, and FIG. 2C shows a state after the printed board 101 is assembled to the apparatus. In this embodiment, the attached body refers to the charging unit 317. 2B and 2C, the printed circuit board 101 is in a state where the A side in FIG. 2A is on the upper side and the B side is on the lower side, the component surface 105 is on the right side in the figure, and the solder surface 106 is illustrated. It is a side view when a contact part and the printed circuit board 101 are seen toward the D side direction from the C side in the state which becomes the middle left side. Further, an arm portion 203 that is one end of the coil portion 201 of the torsion coil spring is an arm portion on the printed circuit board 101 side, and an arm portion 202 that is the other end of the coil portion 201 of the torsion coil spring is an arm on the charging portion 317 side. Part. The arm unit 202 is connected to a high voltage input unit (not shown) of the charging unit 317 that applies a charging voltage to a charging roller (not shown) that charges the photosensitive drum 311.

  FIG. 2B is a side view of the printed circuit board 101 showing a state before the printed circuit board 101 is assembled to the apparatus, and a white arrow in the drawing indicates a direction in which the printed circuit board 101 is assembled to the charging unit 317 on the apparatus side. Is shown. By assembling the printed circuit board 101 in the direction of the white arrow, the arm portion 203 of the torsion coil spring passes through the slit 104 (broken line portion in the figure) while rubbing against the jumper wire 103. The surface 106 of the printed circuit board 101 abuts on a fixing member 206 that fixes the printed circuit board 101 to the apparatus main body. More specifically, the configuration is such that the jumper wire 103 of the printed circuit board and the arm portion 203 of the torsion coil spring come into contact with the fixing member 206.

  FIG. 2C is a side view of the printed circuit board 101 showing a state after the printed circuit board 101 is assembled to the apparatus. As shown in FIGS. 2B and 2C, when the printed circuit board 101 is assembled to the charging unit 317, the operator moves the printed circuit board 101 from the position shown in FIG. 2B to the position shown in FIG. To move. Then, the operator passes the screw 207 through a hole (not shown) provided in the printed board 101 and fixes the printed board 101 to the fixing member 206 of the charging unit 317 by screwing. Further, while the operator moves the printed circuit board 101 toward the fixing member 206, the jumper wire 103 is rubbed by the section 205 of the arm portion 203 of the torsion coil spring that passes through the slit 104. By rubbing the contact portion of the jumper wire 103 with the arm portion 203 of the torsion coil spring, a wiping effect is obtained in which impurities such as dust on the contact portion are scraped off, and the reliability of the contact can be improved.

In this embodiment, a power circuit (not shown) on the printed circuit board 101 is connected to the jumper line 103, and a high voltage generated by the circuit is applied to the jumper line 103. In the state of FIG. 2C, the high voltage generated by the power supply circuit (not shown) passes through the jumper wire 103, the torsion coil spring arm portion 203, the coil portion 201, and the arm portion 202, and the charging portion. 3
17 is supplied.

  As shown in FIG. 2C, a contact pressure (pressure 503 indicated by an arrow in the drawing) due to the elastic force of the torsion coil spring is applied to the jumper wire 103 from the arm portion 203 of the torsion coil spring.

  This ensures electrical connection between the jumper wire 103 and the arm portion 203 of the torsion coil spring. Note that the force applied from the arm portion 203 to the jumper wire 103 by the elastic force of the torsion coil spring has an angle with respect to the surface 105 of the printed circuit board 101. Therefore, as shown in FIG. 2C, the pressure 503 indicated by the arrow in the drawing can be decomposed into a horizontal pressure 501 and a vertical pressure 502 when viewed from the printed circuit board 101. As shown in FIGS. 2B and 2C, when the worker assembles the printed circuit board 101 into the apparatus, the force that the worker receives from the torsion coil spring through the printed circuit board 101 during the operation is the vertical pressure 502. It is. In order to ensure the electrical connection, the pressure 503 required for the contact applied to the jumper wire 103, which is the contact point of the torsion coil spring, is compared with the pressure 502 perpendicular to the surface 105 of the printed circuit board 101. The pressure 502 is smaller than the pressure 503. Therefore, by configuring the contact portion as in this embodiment, when the printed circuit board 101 is assembled to the apparatus in the vertical direction, the contact portion is assembled at a pressure 502 that is weaker than the pressure 503 that is a force necessary for the contact portion. As a result, assembly workability can be improved.

  In addition, when the jumper wire 103 and the arm portion 203 of the torsion coil spring shown in FIG. 2C are electrically connected, the arm portion 203 of the torsion coil spring passes through the slit 104 of the printed circuit board 101. doing. If the arm portion 203 of the torsion coil spring does not penetrate the slit 104 of the printed circuit board 101 and is caught on the surface 106 side of the printed circuit board 101, the arm portion 203 of the torsion coil spring does not protrude from the slit 104. It will be. Therefore, if it can be confirmed by the operator's eyes (208 in the figure) that the arm portion 203 of the torsion coil spring has passed through the slit 104, it can be determined that the torsion coil spring is in contact with the jumper wire 103. It is easy to visually check the part. Further, as described above, the contact portion of the configuration of the present embodiment can be provided with the jumper wire 103 as a contact on both the component surface and the solder surface of the printed circuit board 101. The degree of freedom in layout can be improved.

  In the present embodiment, the case where a torsion coil spring is used as a member for connecting the printed circuit board 101 and the high voltage power supply unit of the charging unit 317 of the apparatus has been described as an example. Since the contact portion is composed of the jumper wire 103 and the linear arm portion 203 of the torsion coil spring, the area required for the contact portion is reduced as compared with the conventional method in which the coil of the spring member is brought into contact. Can do.

  In addition, in order to avoid discharge due to the high voltage applied to the contact part, it is necessary to provide a region in which the placement of parts is prohibited because it is necessary to take a distance according to the high voltage value when placing parts around the contact part. There is. By reducing the area required for the contact portion, it is possible to reduce the area where the component placement around the contact portion provided on the printed circuit board 101 is prohibited, which is effective in reducing the area of the printed circuit board 101. .

In this embodiment, the torsion coil spring is used as a member to be connected, but the present invention is not limited to this, and a conductive member having an elastic structure such as a leaf spring may be used. The jumper wire may also be a flat metal member instead of a linear member such as the jumper wire 103 of the present embodiment. Furthermore, the shape of the slit is not limited to a square shape, and may be, for example, a circle, an ellipse, or a polygon. In this embodiment, A and B
Has been described with respect to the vertical direction of the printed circuit board 101 and C and D as the horizontal direction, A and B may be the horizontal direction of the printed circuit board 101, and C and D may be the vertical direction.

  As described above, according to the present embodiment, it is possible to reduce the area required for the contact portion, reduce the force required during assembly, and easily visually check the contact portion.

  In the first embodiment, the description has been given of the embodiment in which the slit which is the through hole is provided inside the printed circuit board. In Example 2, an example in which a slit is provided at an end of a printed board will be described.

[Composition of contact part]
FIG. 3A is a perspective view showing a contact portion between a jumper wire 103 provided on the printed circuit board 101 and an arm portion 203 of the torsion coil spring on the printed circuit board 101 side. In FIG. 3 (a), the same components as those in FIG. 2 (a) of the first embodiment are denoted by the same reference numerals. Hereinafter, a configuration different from FIG. 2A of the first embodiment will be described, and description of the same configuration will be omitted.

  The difference between FIG. 3A of the present embodiment and FIG. 2A of Embodiment 1 is as follows. That is, in FIG. 2A, the slit 104 is a through hole provided in the printed circuit board 101. On the other hand, in FIG. 3A, the slit 104 is provided at the end of the printed circuit board 101, and one side of the slit 104 is an end of the printed circuit board 101, that is, an opening. It is lacking. Therefore, the slit 104 has a concave shape having an opening as shown in FIG.

  In this embodiment, by providing a contact portion at the end of the printed circuit board 101, an area where the arm portion 203 of the torsion coil spring passes through the slit 104 is attached to the outside of the printed circuit board 101 when the printed circuit board 101 is attached to the apparatus side. Can be. Therefore, the area occupied by the slit 104 on the printed circuit board 101 can be reduced, and as a result, the area where the component placement is prohibited around the contact portion can be reduced, so that the area of the printed circuit board 101 itself can be reduced. Can do.

  Hereinafter, the effect obtained by providing the slit 104 at the end of the printed circuit board 101 will be described with reference to FIG. FIG. 3B shows a case where the slit 104 is provided at the center of the printed circuit board 101 as in the first embodiment (left side drawing in the drawing), and the slit 104 is formed at the end of the printed circuit board 101 as in the present embodiment. It is a side view of the printed circuit board 101 when it is provided (the right side drawing in the figure). The hatched portion in FIG. The right drawing shows a case where the length of the slit 104 in the AB direction is short. Further, in the figure, a two-dot chain line indicates a range in the A-B direction of the slit 104 in the case of Example 1 (left side drawing in the figure). The slit 104 of the present embodiment shown on the right side of FIG. 3B is longer than the slit 104 of the first embodiment shown on the left side in FIG. It is getting shorter. In the present embodiment, the arm portion 203 of the torsion coil spring can come into contact with the jumper wire 103 in a state of protruding from the slit 104 by E. The slit 104 has an opening at the end of the printed circuit board 101. Therefore, for example, even when the arm portion 203 of the torsion coil spring does not enter the slit 104 and is caught by the end portion on the A side of the printed circuit board 101, the opening that is a notch provided at the end portion of the printed circuit board 101. It can be guided to the slit 104 via the section.

As described above, according to the present embodiment, it is possible to reduce the area required for the contact portion, reduce the force required during assembly, and easily visually check the contact portion. In particular, by providing the slit at the end of the printed circuit board, the area required for the slit can be further reduced.

  In the first and second embodiments, the embodiments in which the number of contact portions provided on the printed circuit board is one have been described. In the third embodiment, an embodiment in which there are two contact portions provided on the printed board will be described.

[Composition of contact part]
FIG. 4A is a perspective view showing a contact portion between jumper wires 103a and 103b provided on the printed circuit board 101 and arm portions 203a and 203b of the torsion coil spring on the printed circuit board 101 side. The configuration shown in FIG. 4A is the same as the configuration shown in the second embodiment. However, in the second embodiment, the number of contact portions is two in the second embodiment. Is different. FIG. 4B is a side view showing the printed circuit board 101 and the contact portion where the arm portion 203a of the torsion coil spring contacts the jumper wire 103a. 4A and 4B, the pressures 501a and 501b indicated by arrows are horizontal directions (A− of the printed circuit board 101) among the pressures applied by the arm portions 203a and 203b of the torsion coil spring to the jumper wires 103a and 103b. (B direction) pressure is shown. Also, the pressures 501a and 502a shown in FIG. 4B are a horizontal component and a vertical component as viewed from the printed circuit board 101 at the pressure 503a, respectively. The slits 104a and 104b are provided at two ends of the printed circuit board 101 facing each other in the AB direction. The pressures 501a and 501b applied to the jumper wires 103a and 103b by the torsion coil springs work in opposite directions (reverse directions) in the horizontal direction (AB direction). Thereby, the electrical connection in a contact part is made more reliable.

  When the torsion coil spring and the jumper wire are electrically connected in the above-described configuration, the pressures 503a and 503b (not shown) of the arm portions 203a and 203b of the torsion coil spring are connected via the jumper wires 103a and 103b. Added to the printed circuit board 101. These pressures 503a and 503b (not shown) are set so that a predetermined pressure is applied in order to ensure the reliability of the contact between the torsion coil spring and the jumper wires 103a and 103b at the contact portions. For this reason, the amount of pressure applied to the printed circuit board by the torsion coil spring is the same in the contact point between the torsion coil spring and the jumper wire 103 in the first and second embodiments as in this embodiment.

  In addition, with the above-described configuration, as in the first embodiment, the force when assembling the printed board 101 to the apparatus main body is distributed, the force when assembling the printed board 101 is reduced, and the deflection of the printed board 101 is reduced. Can be made. That is, when the printed circuit board 101 is bent, the surface of the printed circuit board 101 is stretched. Since the elongation occurs, stress is generated in the land of the soldering portion on the printed circuit board 101, solder, and circuit components, which causes cracks and cracks. Therefore, if the deflection of the printed circuit board 101 can be reduced as in the present embodiment, cracks and cracks generated in the lands of the soldered portions of the components mounted on the circuit board are reduced, and the printed circuit board 101 is used in the apparatus. Assembly workability at the time of assembly can be improved.

  In this embodiment, the case where the number of contact portions is two has been described as an example, but the number of contact portions is not limited to two. For example, when the printed circuit board 101 has a plurality of contact points, and there are one or more contact points where the positions of the end portions where the contact point portions are provided are opposed to each other, the force required at the time of assembly is reduced, so that two or more points are required. This can also be applied when there are multiple contacts. Moreover, although the slit 104 of this embodiment is provided at the end, the configuration of this embodiment can be applied to the case of a plurality of slits provided inside the printed circuit board 101 as in the first embodiment. .

  As described above, according to the present embodiment, it is possible to reduce the area required for the contact portion, reduce the force required during assembly, and easily visually check the contact portion.

  The torsion coil spring described in Examples 1 to 3 was electrically connected to the jumper wire at one location. In the fourth embodiment, a torsion coil spring electrically connected to a jumper wire at a plurality of locations will be described.

[Composition of contact part]
FIG. 5A is a perspective view showing a contact portion between the jumper wire 103 provided on the printed circuit board 101 and the arm portion 203c of the torsion coil spring on the printed circuit board 101 side. 5A, the same reference numerals are given to the same configurations as those in FIG. 2A of the first embodiment. Hereinafter, a configuration different from FIG. 2A of the first embodiment will be described, and description of the same configuration will be omitted. FIG. 5B is a diagram showing the shape of the torsion coil spring of this embodiment. In FIG. 5A, the arm portion 203c of the torsion coil spring is electrically connected to the jumper wire 103 at two places, that is, two contact points, a first contact 601a and a second contact 602b. Thereby, compared with the method of making contact with the jumper wire 103 at one place as in the first to third embodiments, the contact area with the jumper wire 103 at a plurality of places as in this embodiment increases the contact area. The contact failure is reduced and the reliability of the contact portion can be improved.

  FIG. 5B shows the shape of the torsion coil spring of this embodiment. FIGS. 2B and 2C of the first embodiment, FIG. 3B of the second embodiment, and FIG. 4 of the third embodiment. In the drawing, the torsion coil spring shown in (b) is shown rotated 90 degrees horizontally. In the torsion coil spring shown in FIG. 5B, the shape of the arm portion 203 is made U-shaped by folding back the tip of the arm portion 203 of the torsion coil springs of the first to third embodiments. Further, the arm portion 203c of this embodiment can be created by further folding the arm portion 203 90 degrees toward the arm portion 202 side. By using the torsion coil spring having the arm portion 203c, the arm portion 203c of the torsion coil spring can contact the jumper wire 103 at two locations. Note that the width of the U-shaped portion of the arm portion 203c is narrower than the width of the slit 104 in the direction of the jumper wire 103 (CD direction), as shown in FIG. The shape of the arm portion 203c is not limited to the U shape, and the same effect can be obtained as long as the shape is folded at a predetermined angle at one or more locations (or a plurality of locations). In this embodiment, the number of contacts between the torsion coil spring and the jumper wire 103 is two, but the number of contacts is not limited to two. For example, the reliability of the contact portion can be further improved by increasing the number of turns of the arm portion 203 c of the torsion coil spring and increasing the number of contacts with the jumper wire 103. Moreover, the torsion coil spring of the present embodiment can also be applied to the torsion coil springs of Embodiments 1 to 3.

  As described above, according to the present embodiment, it is possible to reduce the area required for the contact portion, reduce the force required during assembly, and easily visually check the contact portion.

  In the second and third embodiments, the slit 104 provided at the end portion of the printed circuit board 101 has a concave shape, but in the fifth embodiment, the opening portion of the end portion of the printed circuit board 101 of the slit 104 is widened. explain.

[Composition of contact part]
FIG. 6 is a perspective view showing a contact portion between the jumper wire 103 provided on the printed circuit board 101 and the arm portion 203 on the printed circuit board 101 side of the torsion coil spring. In FIG. 6, the same reference numerals are given to the same configurations as those in FIG. 2A of the first embodiment. Hereinafter, a configuration different from FIG. 2A of the first embodiment will be described, and description of the same configuration will be omitted. As shown in FIG. 6, the slit 104 has the same basic configuration as that of the second embodiment. In the second embodiment, the slit shape of the printed circuit board 101 is a concave shape, whereas in the present embodiment, the Y-shape is formed by widening the opening in the CD direction on the end side of the printed circuit board 101. Is different. Note that the shape of the slit 104 is not limited to the Y-shape, and it is sufficient that the opening portion on the end side of the slit 104 is widened. For example, the shape may be a V-shape.

  Since the opening on the end side of the printed circuit board 101 is widened by adopting the configuration of the slit 104 of the present embodiment shown in FIG. 6, a wider range than the concave slit 104 as in the second embodiment. Thus, the arm portion 203 of the torsion coil spring can be guided (retracted). That is, even if the arm portion 203 of the torsion coil spring is displaced from the slit 104, it is possible to guide the arm portion 203 of the torsion coil spring through the opening portion into the slit 104 as compared with the second embodiment. It can be easier. As a result, when the printed circuit board 101 is attached to the apparatus side, the amount of the arm portion 203 drawn into the slit 104 is increased, and contact failure due to a shift between the mounting position of the printed circuit board 101 and the arm portion 203 of the torsion coil spring is prevented. can do. The configuration of the slit 104 of this embodiment can be applied to the configuration of the slits 104a and 104b of the third embodiment. Further, the shape of the arm portion 203 of the torsion coil spring of the present embodiment may be a U-shape like the arm portion 203c described in the fourth embodiment.

  As described above, according to the present embodiment, it is possible to reduce the area required for the contact portion, reduce the force required during assembly, and easily visually check the contact portion.

101 Printed circuit board 104 Slit 103 Jumper wires 202, 203 Arm

The present invention relates to a printed circuit board , an apparatus including the printed circuit board, and an image forming apparatus including the printed circuit board.

In the printed circuit board (1) circuits are mounted, a recessed opening from the end face of the printed circuit board, a first width of the opening in a plane along the end face, of the printed circuit board than the end face An opening having a second width larger than the width of the opening on the inside is provided, and includes a first conductive member connected to the printed circuit board across the opening, and the first conductive member is A printed circuit board connected to the printed circuit board across the position of the second width of the opening .
(2) In an apparatus to which a printed circuit board on which a circuit is mounted is attached, the printed circuit board has an opening recessed from an end surface of the printed circuit board, and a first width of the opening in a plane along the end surface However, an opening having a shape having a second width larger than the width of the opening inside the printed board than the end surface is provided, and the first conductive member connected to the printed board across the opening A fixing member for fixing the printed circuit board to the device, and a second conductive member having one end connected to the device and the other end contacting the first conductive member, the first conductive member Is connected to the printed circuit board across the position of the second width of the opening.
(3) an image forming means for forming an image, in the image forming apparatus printed circuit board is attached for supplying a voltage to said image forming means are circuits mounted to said printed circuit board, the An opening recessed from an end surface of the printed circuit board, wherein a first width of the opening in a plane along the end surface is larger than a width of the opening inside the printed circuit board than the end surface. A first conductive member that is connected to the printed circuit board and is supplied with voltage across the opening; a fixing member that fixes the printed circuit board to the image forming apparatus; and One end side of the image forming apparatus is connected to the image forming apparatus, and the other end side of the image forming apparatus is in contact with the first conductive member, and the first conductive member is positioned at the second width of the opening. An image forming apparatus characterized by being connected to the printed circuit board across.

Claims (19)

A printed circuit board on which a circuit for generating a voltage is mounted,
A through hole penetrating the printed circuit board;
A first contact member provided across the through hole and applied with the voltage;
With
At the time of attachment to the attached body to which one end of the second contact member having elasticity is connected, the first contact member and the other end of the second contact member that has passed through the through hole are in contact with each other, The printed circuit board, wherein the voltage is supplied to the attached body through the second contact member.   The printed circuit board according to claim 1, wherein the first contact member and the second contact member have conductivity.   The printed circuit board according to claim 1, wherein the first contact member is provided on a surface on which the circuit component is mounted.   The printed circuit board according to claim 1, wherein the first contact member is provided on a surface on which the circuit component is not mounted.   The printed circuit board according to claim 1, wherein the first contact member is provided on a surface of the printed circuit board facing the attached body.   3. The printed circuit board according to claim 1, wherein the first contact member is provided on a surface opposite to the surface of the printed circuit board facing the attached body. 4. The other end of the second contact member has a linear shape,
The printed circuit board according to claim 1, wherein the other end is in contact with the first contact member at one location.   The printed circuit board according to claim 1, wherein the other end of the second contact member has a shape folded at at least one place.   The printed circuit board according to claim 1, wherein the second contact member is a torsion coil spring. The through hole is provided at an end of the printed circuit board,
The printed circuit board according to claim 1, wherein the through hole has a concave shape having an opening. The through hole is provided at an end of the printed circuit board,
10. The printed circuit board according to claim 1, wherein the through hole has a shape in which an opening portion is widened toward an end side of the printed circuit board. 11. Having a first through hole and a second through hole provided at opposite ends of the printed circuit board;
The direction of the force parallel to the surface of the printed circuit board applied from the second contact member to the first contact member provided in the first through hole is set in the second through hole. The direction of the force parallel to the surface of the printed circuit board applied to the first contact member from the second contact member is opposite to the direction of the printed circuit board. Printed board. An image carrier on which an electrostatic latent image is formed;
Charging means for charging the image carrier at a predetermined potential;
Developing means for developing the electrostatic latent image of the image carrier with toner and forming a toner image;
Transfer means for transferring the toner image of the image carrier to a sheet;
The printed circuit board according to any one of claims 1 to 12,
An image forming apparatus comprising:   The image forming apparatus according to claim 13, wherein the attached body is at least one of the charging unit, the developing unit, and the transfer unit.   The image forming apparatus according to claim 13, further comprising a cleaning unit that cleans the transfer unit, wherein the attached body is the cleaning unit.   14. The image forming apparatus according to claim 13, further comprising a separating unit for separating the sheet from the image carrier, wherein the attached body is the separating unit.   The image forming apparatus according to claim 13, further comprising a sensor for detecting a remaining amount of toner, wherein the attached body is the sensor.   The image forming apparatus according to claim 13, further comprising a toner charging member for charging toner, wherein the attached body is the toner charging member. An intermediate transfer member carrying a toner image;
Primary transfer means for primary transfer of the toner image formed on the image carrier to the intermediate transfer body; and secondary transfer means for secondary transfer of the toner image primarily transferred to the intermediate transfer body onto the sheet And
The image forming apparatus according to claim 13, wherein the attached body is the primary transfer unit or the secondary transfer unit.

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