JP2016152289A - Electrical connection structure and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical connection structure that enables smooth assembly work of electrically connecting a substrate to a connection target object and reliable electrical connection of the substrate and the connection target member, and an image forming apparatus.SOLUTION: An electrical connection structure comprises: a power supply substrate that includes a first surface on which an element is arranged and a second surface on the opposite side of the first surface and has a through hole penetrating the first surface and second surface formed therein; a connection terminal that is electrically connected to the power supply substrate from the second surface through the through hole to supply power to a power supply target body; and a frame body that has a holding part formed thereon to regulate a movement of the connection terminal in a direction intersecting with the through hole and supports the power supply substrate from the second surface side.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electrical connection structure and an image forming apparatus.

  A unit side contact provided in a unit that is detachably attached to the apparatus body, an electrical board provided in the apparatus body, a through-hole provided in the electrical board, and a through-hole on one surface of the electrical board. A main body side contact provided across the opening, a first contact that contacts the main body side contact, and a second contact that is electrically connected to the first contact and contacts the unit side contact; The first contact is biased to the main body side contact with the main body side contact and the first contact in contact with each other and the unit side contact and the second contact in contact with each other. And an elastic conductive member that urges the second contact to the unit side contact, guides the first contact of the elastic conductive member to the main body side contact, and supports an end of the elastic conductive member on the first contact side. Restriction that regulates the position to the position facing the body side contact When electrical connection structure with is known (Patent Document 1).

JP 2011-203315 A

  The present invention provides an electrical connection structure and an image forming apparatus that can smoothly perform an assembly operation for electrically connecting a substrate to an object to be connected and reliably connect the substrate and the connected member. With the goal.

In order to solve the above-mentioned problem, the electrical connection structure according to claim 1,
A power supply substrate having a first surface on which an element is disposed and a second surface opposite to the first surface, wherein a through-hole penetrating the first surface and the second surface is formed;
A connection terminal that is inserted into the through hole from the second surface and is electrically connected to the power supply board to supply power to the power supply body;
A holding part that holds the connection terminal so as to restrict movement in a direction intersecting the through hole, and a frame that supports the power supply substrate from the second surface side,
It is characterized by that.

The invention according to claim 2 is the electrical connection structure according to claim 1,
The connection terminal has a contact part that contacts the output terminal of the power supply substrate while urging the output terminal in the first surface direction, and the holding part is inserted into the contact part to connect the connection terminal to the contact part. A first holding part for holding from the inside, and a second holding part for holding the terminal from the outside of the contact part,
It is characterized by that.

The invention according to claim 3 is the electrical connection structure according to claim 1 or 2,
A plate shape in which the first holding part is inclined to one end side where the contact part is inserted and the contact part is easy to insert, and an inclined surface is formed at each corner part on the one end side. Rib,
It is characterized by that.

The invention according to claim 4 is the electrical connection structure according to any one of claims 1 to 3,
The second holding part is a plate-like rib in which an inclined surface is formed at each corner part on one end side inserted through the through hole.
It is characterized by that.

The invention according to claim 5 is the electrical connection structure according to any one of claims 1 to 4,
An insertion member that is inserted between the output terminal and the holding member and that contacts the other surface of the output terminal facing the contact portion;
It is characterized by that.

The invention according to claim 6 is the electrical connection structure according to claim 5,
An inclined surface is formed at each corner portion on the side where the insertion member is inserted across the first holding portion,
It is characterized by that.

In order to solve the problem, an image forming apparatus according to claim 7,
An image forming unit for forming a toner image including an image carrier and a developing device for forming the toner image;
An exposure device that exposes the charged image carrier to form a latent image; and
The electrical connection structure according to any one of claims 1 to 6,
Transfer means for transferring a toner image obtained by development of the developing device to a recording medium;
Fixing means for fixing the image transferred to the recording medium by the transfer means,
It is characterized by that.

According to invention of Claim 1 and 2, the assembly operation | work which electrically connects a board | substrate to a to-be-connected object can be performed smoothly, and a board | substrate and a to-be-connected member can be electrically connected reliably.
According to invention of Claim 3, the contact to the power supply board of a terminal can be stabilized.
According to invention of Claim 4, the assembly operation | work which electrically connects a board | substrate to a to-be-connected object can be performed smoothly.
According to invention of Claim 5, a deformation | transformation of an output terminal can be suppressed.
According to invention of Claim 6, an insertion member can be assembled | attached easily.
According to the seventh aspect of the present invention, the assembly operation for electrically connecting the substrate to the connection target can be smoothly performed, and the substrate and the connected member can be reliably electrically connected.

2 is a schematic cross-sectional view showing an internal configuration of the image forming apparatus 1. FIG. 1 is a perspective view with a viewpoint on an element arrangement side showing an overall configuration of an electrical connection structure 100. FIG. (A) is an exploded perspective view focusing on the element arrangement side of the electrical connection structure 100, and (b) is an exploded perspective view showing a state where the power supply substrate 110 and the frame body 130 are fixed. FIG. 6 is a schematic plan view and a cross-sectional view of an element arrangement side of a power supply substrate 110. FIG. (A) is an enlarged perspective view focusing on the power supply board 110 side of the holding part of the frame 130, and (b) is a sectional view. (A) is a plane schematic diagram which shows the state by which the connection terminal 120 was penetrated by the holding | maintenance part of the frame 130, (b) is a cross-sectional schematic diagram. 6 is a perspective view showing a state where a second holding part 132 of a frame body 130 is inserted into a power supply substrate 110. FIG. 4 is a perspective view of an insertion member 140. FIG. FIG. 6 is a perspective view showing a state where the insertion member 140 is inserted between the receiving surface 132b of the second holding part 132 and the output terminal 112 across the first holding part 131. It is a cross-sectional schematic diagram of the electrical connection structure 100 in an assembled state.

Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, and the up-down direction is the Z-axis direction.
(1) Overall Configuration and Operation of Image Forming Apparatus 1 FIG. 1 is a schematic cross-sectional view showing the internal configuration of the image forming apparatus 1 according to this embodiment.
Hereinafter, the overall configuration and operation of the image forming apparatus 1 will be described with reference to the drawings.

  The image forming apparatus 1 includes a control device 10, a paper feeding device 20, a photosensitive unit 30, a developing unit 40, a transfer device 50, a fixing device 60, and an electrical connection structure 100. On the upper surface (Z direction) of the image forming apparatus 1, there is formed a discharge tray 1a for discharging and storing the paper P on which an image is recorded.

  The control device 10 includes an image forming device control unit 11 that controls the operation of the image forming device 1, a controller unit 12 that prepares image data in response to a print processing request, an exposure control unit 13 that controls lighting of the exposure device LH, and the like. Have

  The controller unit 12 converts print information input from an external information transmission device (for example, a personal computer) into image information for forming a latent image, and outputs a drive signal to the exposure device LH at a preset timing. . The exposure apparatus LH of the present embodiment is configured by an LED head in which a plurality of light emitting elements (LEDs) are arranged linearly along the main scanning direction.

A paper feeding device 20 is provided at the bottom of the image forming apparatus 1. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The sheets P stacked on the sheet stacking plate 21 and positioned in the width direction by a regulating plate (not shown) are pulled out one by one from the upper side by the sheet pulling portion 22 (X direction), and then the registration roller pair. 23 is conveyed to the nip portion.
Above the paper feeding device 20, a second paper feeding device 20A is provided. The second paper feeding device 20 </ b> A conveys the paper P drawn by the paper drawing unit 25 to the nip portion of the registration roller pair 23 via the paper conveyance path 27.

  The photoconductor unit 30 includes a photoconductor drum 31 that is provided in parallel above the paper feeding device 20 (in the Z direction) and serves as an image carrier that is rotationally driven. A charging roller 32, an exposure device LH, a developing unit 40, a primary transfer roller 52, and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with the charging roller 32.

The developing unit 40 has a developing housing 41 in which a developer is accommodated. In the developing housing 41, a developing roller 42 disposed to face the photosensitive drum 31, and a pair of augers 44 that stir and convey the developer to the developing roller 42 side obliquely below the back side of the developing roller 42, 45 is arranged. A layer regulating member 46 that regulates the layer thickness of the developer is disposed in proximity to the developing roller 42.
Each of the developing units 40 is configured in the same manner except for the developer contained in the developing housing 41, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). .

  The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by the latent image forming light emitted from the exposure device LH. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.

  The transfer device 50 includes an intermediate transfer belt 51 to which each color toner image formed on the photoconductive drum 31 of each photoconductor unit 30 is transferred, and each color toner image formed on each photoconductor unit 30 to the intermediate transfer belt. 51, a primary transfer roller 52 that sequentially transfers (primary transfer) to 51, and a secondary transfer roller 53 that collectively transfers (secondary transfer) each color toner image transferred on the intermediate transfer belt 51 onto the paper P. Yes.

  The electrical connection structure 100 is disposed above the second paper feeding device 20A (Z direction) and below the photoconductor unit 30 and the developing unit 40 (−Z direction), and includes a charging roller 32, a developing roller 42, and a primary transfer roller 52. Then, a voltage is applied to the secondary transfer roller 53 and the like.

  Each color toner image formed on the photoconductive drum 31 of each photoconductive unit 30 is transferred to the intermediate transfer belt by the primary transfer roller 52 to which a predetermined transfer voltage is applied from the electrical connection structure 100 controlled by the image forming apparatus control unit 11. Electrostatic transfer (primary transfer) is sequentially performed on 51, and a superimposed toner image in which toners of respective colors are superimposed is formed.

  The superimposed toner image on the intermediate transfer belt 51 is conveyed to a region (secondary transfer portion T) where the secondary transfer roller 53 is disposed as the intermediate transfer belt 51 moves. When the superimposed toner image is conveyed to the secondary transfer unit T, the paper P is supplied from the paper feeding device 20 to the secondary transfer unit T in accordance with the timing. A predetermined transfer voltage is applied to the secondary transfer roller 53 from the electrical connection structure 100 controlled by the image forming apparatus control unit 11, and the secondary transfer roller 53 is fed from the registration roller pair 23 to the paper P guided by the conveyance guide. Multiple toner images on the intermediate transfer belt 51 are collectively transferred.

  Residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in the waste developer container. The surface of the photosensitive drum 31 is recharged by the charging roller 32. Residues that cannot be completely removed by the cleaning blade 34 and adhere to the charging roller 32 are captured and accumulated on the surface of the cleaning roller 33 that rotates in contact with the charging roller 32.

  The fixing device 60 includes a heating module 61 and a pressure module 62, and a fixing nip portion N (fixing area) is formed by a pressure contact area between the heating module 61 and the pressure module 62.

The sheet P on which the toner image is transferred in the transfer device 50 is conveyed to the fixing device 60 via the conveyance guide in a state where the toner image is not fixed. The toner image is fixed on the sheet P conveyed to the fixing device 60 by a pair of heating module 61 and pressure module 62 by the action of pressure bonding and heating.
The sheet P on which the fixing toner image is formed is discharged from the discharge roller pair 69 to the discharge tray 1 a on the upper surface of the image forming apparatus 1 via the conveyance roller pair 68.

(2) Electrical connection structure (2.1) Overall configuration FIG. 2 is a perspective view showing the overall configuration of the electrical connection structure 100 as viewed from the element arrangement side, and FIG. FIG. 4B is an exploded perspective view showing a state in which the power supply board 110 and the frame body 130 are fixed. FIG. 4 is a schematic plan view and a cross section of the power supply board 110 on the arrangement side. FIG. Hereinafter, the overall configuration of the electrical connection structure 100 according to the present embodiment will be described with reference to the drawings.

  As shown in FIGS. 2 and 3, the electrical connection structure 100 includes a power supply substrate 110, connection terminals 120, a frame body 130, and an insertion member 140.

As shown in FIG. 2, on the first surface 110a of the power supply substrate 110, a transformer (transformer), a resistor, a capacitor (capacitor), and the like that generate voltage to be supplied to the photosensitive unit 30 and the developing unit 40 through the connection terminals 120 are provided. Elements are arranged.
As shown in FIG. 4, a through hole 111 penetrating the second surface 110 b and the lower first surface 110 a is formed in a region electrically connected to the connection terminal 120, and two output terminals straddling the through hole 111. 112 is arranged.

  The connection terminal 120 is electrically connected to the power supply substrate 110 and supplies power to the photoconductor unit 30 and the developing unit 40 as power supply bodies. The connection terminal 120 is made of a wire material, and has a compression coil spring portion 121 as a contact portion whose one end is urged to contact the output terminal 112 of the power supply substrate 110. The other end side has a torsion coil spring portion 122 that contacts the power supply portion of the photosensitive unit 30 and the developing unit 40.

In order to support the power supply substrate 110 on the first surface side and prevent creeping discharge, the frame body 130 is rectangular by an insulator so that its shape is larger in plan view than the second surface 110b of the power supply substrate. It is formed into a shape.
A compression coil spring part 121 is inserted into one end side of the frame body 130 to hold the connection terminal 120 from the inside of the compression coil spring part 121, and the connection terminal 120 is held from the outside of the compression coil spring part 121. The second holding part 132 is integrally formed.

(2.2) Connection Structure FIG. 5A is an enlarged perspective view of the holding part of the frame body 130 viewed from the power supply board 110 side, FIG. 5B is a cross-sectional view, and FIG. FIG. 7 is a schematic plan view showing a state in which the connection terminal 120 is inserted into the holding part, FIG. 7B is a schematic cross-sectional view, and FIG. 7 is a perspective view showing a state in which the second holding part 132 of the frame body 130 is inserted into the power supply board 110. 8 is a perspective view of the insertion member 140. FIG. 9 is a perspective view showing a state where the insertion member 140 is inserted between the receiving surface 132b of the second holding part 132 and the output terminal 112 across the first holding part 131. FIG.
Hereinafter, the connection structure of the electrical connection structure 100 according to the present embodiment will be specifically described with reference to the drawings.

As shown in FIGS. 5A and 5B, the first holding portion 131 formed on the frame body 130 has a plate-like rib shape as a whole, and has a tip on the side where the compression coil spring portion 121 is inserted. A guiding portion 131a that has an inclined surface 131c and protrudes in a direction intersecting the insertion direction is formed. In addition, inclined surfaces 131 c are formed at the respective corners on the distal end side of the first holding portion 131.
A thickness W2 including the width W1 (see FIG. 5A) of the first holding part 131 and the guiding part 131a is formed smaller than the inner diameter of the compression coil spring part 121 to be inserted.

  As shown in FIG. 6A, the inner side 121 a of the compression coil spring part 121 and the guide part 131 a of the first holding part 131 in a state where the compression coil spring part 121 of the connection terminal 120 is inserted into the first holding part 131. A gap G1 is secured, and gaps G2 and G3 are secured in the width direction of the first holding part 131, respectively.

  As a result, the first holding part 131 has an overall guiding shape, and after the insertion, compresses the movement in the direction intersecting the insertion direction while suppressing the buckling when the compression coil spring part 121 of the connection terminal 120 is inserted. The coil spring 121 is regulated from the inside.

The second holding portion 132 has a plate-like rib shape as a whole, and a tapered portion 132a is formed at each corner portion on the tip end side that is inserted into the through hole 111 of the power supply substrate 110.
As shown in FIG. 6B, the second holding portion 132 is formed with a receiving surface 132 b that receives the end portion of the compression coil spring portion 121 of the connection terminal 120, before being connected to the output terminal 112 of the power supply substrate 110. In this state, the urging force of the compression coil spring 121 is held.
Further, a wall portion 132 c is formed in the insertion direction of the compression coil spring portion 121, and movement in a direction crossing the insertion direction of the compression coil spring portion 121 is restricted from the outside of the compression coil spring portion 121.

  As a result, as shown in FIG. 7, the second holding part 132 is inserted from the through hole 111 of the power supply substrate 110 while restricting the compression coil spring part 121 inserted through the first holding part 131 from the outside of the compression coil spring part 121. Thus, the end of the compression coil spring 121 is guided so as to come into contact with the two output terminals 112 arranged on the first surface 110 a of the power supply substrate 110.

  As shown in FIG. 8, in the insertion member 140, two parallel projecting portions 141 have a U shape in plan view, and the interval W <b> 3 (see FIG. 6) between the projecting portions 141 is the width of the first holding portion 131. It is formed wider than W1 (see FIG. 5A). Inclined surfaces 141 a and 141 b are formed on the front end sides of the respective protrusions 141.

As shown in FIG. 9, the insertion member 140 is inserted into the through hole 111 of the power supply substrate 110 by the compression coil spring portion 121 of the connection terminal 120 inserted through the first holding portion 131 being guided by the second holding portion 132. In a state where it is connected to the output terminal 112, it is inserted between the receiving surface 132 b of the second holding part 132 and the output terminal 112 across the first holding part 131.
As a result, it is possible to suppress the deformation of the output terminal 112 receiving the contact pressure by the urging force of the compression coil spring 121.

(3) Action of Electrical Connection Structure FIG. 10 is a schematic sectional view of the electrical connection structure 100 in an assembled state.
In the image forming apparatus 1 according to the present embodiment, a paper feeding device 20 is provided at the bottom, and a second paper feeding device 20 </ b> A is provided above the paper feeding device 20.
An electrical connection structure 100 including a power supply substrate 110 having elements arranged on the first surface with respect to the image forming apparatus 1 is disposed above the second sheet feeding device 20A (Z direction). The photosensitive unit 30 and the developing unit 40 that receive power from the electrical connection structure 100 are disposed above (in the Z direction).

The power supply board 110 has elements that are arranged on the first surface 110a with respect to the image forming apparatus 1 so as to fill the space of the paper conveyance path 27, and suppresses the overall height of the image forming apparatus 1 and is downsized. Has been.
The connection terminal 120 that is inserted through the through hole 111 from the second surface 110b and electrically connected to the output terminal 112 disposed on the first surface 110a of the power supply substrate 110 has a power supply for preventing creeping discharge. Compared to the second surface 110b of the substrate 110, the frame 130 is formed in a rectangular shape by an insulator so that the shape is larger in plan view.

  A first holding part 131 that holds the compression coil spring part 121 of the connection terminal 120 from the inside and a second holding part 132 that holds the compression coil spring part 121 from the outside are integrally formed on one end side of the frame 130. The 1 holding part 131 is formed with a guide part 131a on the side where the compression coil spring part 121 is inserted. In addition, inclined surfaces 131 c are formed at the respective corners on the distal end side of the first holding portion 131. Therefore, buckling when the compression coil spring portion 121 of the connection terminal 120 is inserted is suppressed.

The second holding part 132 is inserted from the through hole 111 of the power supply substrate 110 while restricting the compression coil spring part 121 inserted through the first holding part 131 from the outside, and the end of the compression coil spring part 121 is output to two outputs. The connection terminal 120 and the output terminal 112 are electrically connected while being guided so as to contact the terminal 112.
In this state, as shown in FIG. 10, the insertion member 140 is inserted between the receiving surface 132 b of the second holding part 132 and the output terminal 112 across the first holding part 131 to attach the compression coil spring part 121. Deformation of the output terminal 112 receiving contact pressure by force is suppressed.

  Therefore, according to the electrical connection structure 100 according to the present embodiment, the output of the power supply substrate 110 is prevented from buckling in the assembly of the electrical connection structure 100 while suppressing the height of the entire image forming apparatus 1. The electrical connection between the terminal 112 and the connection terminal 120 can be reliably performed.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feed apparatus 30 ... Photoconductor unit 40 ... Developing unit 50 ... Transfer apparatus 60 ... Fixing apparatus 100 ... Electricity Connection structure 110 ... Power supply board 111 ... Through hole 112 ... Output terminal 120 ... Connection terminal 121 ... Compression coil part 130 ... Frame body 131 ... First holding part 131a ...・ Invitation department
132 ... 2nd holding part 140 ... Insertion member

Claims (7)

A power supply substrate having a first surface on which an element is disposed and a second surface opposite to the first surface, wherein a through-hole penetrating the first surface and the second surface is formed;
A connection terminal that is inserted into the through hole from the second surface and is electrically connected to the power supply board to supply power to the power supply body;
A holding part that holds the connection terminal so as to restrict movement in a direction intersecting the through hole, and a frame that supports the power supply substrate from the second surface side,
An electrical connection structure characterized by that. The connection terminal has a contact part that contacts the output terminal of the power supply substrate while urging the output terminal in the first surface direction, and the holding part is inserted into the contact part to connect the connection terminal to the contact part. A first holding part for holding from the inside, and a second holding part for holding the terminal from the outside of the contact part,
The electrical connection structure according to claim 1. A plate shape in which the first holding part is inclined to one end side where the contact part is inserted and the contact part is easy to insert, and an inclined surface is formed at each corner part on the one end side. Rib,
The electrical connection structure according to claim 1, wherein the electrical connection structure is provided. The second holding part is a plate-like rib in which an inclined surface is formed at each corner part on one end side inserted through the through hole.
The electrical connection structure according to claim 1, wherein: An insertion member that is inserted between the output terminal and the holding member and that contacts the other surface of the output terminal facing the contact portion;
The electrical connection structure according to any one of claims 1 to 4, wherein the electrical connection structure is provided. An inclined surface is formed at each corner portion on the side where the insertion member is inserted across the first holding portion,
The electrical connection structure according to claim 5. An image forming unit for forming a toner image including an image carrier and a developing device for forming the toner image;
An exposure device that exposes the charged image carrier to form a latent image; and
The electrical connection structure according to any one of claims 1 to 6,
Transfer means for transferring a toner image obtained by development of the developing device to a recording medium;
Fixing means for fixing the image transferred to the recording medium by the transfer means,
An image forming apparatus.

Images