JP2017034100A - Control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembly and disassembly of a printed circuit board, while relaxing the layout constraints.SOLUTION: A temperature controller (10) is constituted of a first printed circuit board (21), and a second printed circuit board (22) that is connected electrically with the first printed circuit board. The temperature controller is assembled while opposing the front end face of the second printed circuit board to the rear face, becoming the principal surface of the first printed circuit board. A pad (24) is provided on the rear face of the first printed circuit board, and an end face pad (32) is provided on the front end face of the second printed circuit board. The pad and end face pad are electrified while sandwiching an anisotropic conductive sheet (23).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a control device including a plurality of printed circuit boards that are electrically connected to each other.

  As disclosed in Patent Document 1, various control devices use a main board made of a printed board and a sub board provided inside a front case and a rear case. In this document, the main board is arranged in parallel with the front panel of the front case, and a plurality of sub boards are provided on the rear surface side of the main board. The sub-board is electrically connected to the main board via a connector with the front end facing the rear surface of the main board.

JP 2004-128137 A

  However, in the connection using the connectors described above, the connectors are mounted on both boards, so that the area occupied by the connectors on each board is widened. For this reason, there is a problem that it is difficult to increase the efficiency of component mounting due to restrictions on the board layout by the connector.

  By the way, as another connection method between the main board and the child board, there is a case where soldering is performed across the pads which become the conductor pattern of each board. This soldering serves as both fixing of the sub board to the main board and electrical connection.

  However, in the soldering, there is a problem that the work is troublesome and there is a high possibility that the soldering will be in a defective state unless it is a certain skill. Further, when there is a problem in the circuit of the board, when the child board is disassembled from the main board, the solder attached to the pads must be removed cleanly, resulting in a problem that the disassembly becomes difficult.

  The present invention has been made in view of this point, and an object of the present invention is to provide a control device capable of facilitating assembly and disassembly of a printed circuit board while relaxing restrictions on the layout of the printed circuit board.

  The control device of the present invention includes a first printed circuit board and a second printed circuit board electrically connected to the first printed circuit board, and an end surface of the second printed circuit board is provided on a main surface of the first printed circuit board. In the control device assembled in the opposed state, pads are provided on the main surface of the first printed circuit board and the end surface of the second printed circuit board, and an anisotropic conductive sheet is sandwiched between these pads. It is characterized by being energized.

  According to this configuration, since the first printed board and the second printed board are energized by sandwiching the anisotropic conductive sheet as described above, the conventional soldering operation can be omitted. This not only facilitates the electrical connection of each printed circuit board compared to soldering, but also eliminates the work of removing the solder at the time of disassembly, thereby facilitating the disassembly of each printed circuit board. Therefore, it is possible to improve the efficiency of both the assembly of the first printed circuit board and the second printed circuit board and the decomposition of the second printed circuit board from the first printed circuit board. Further, it is not necessary to mount a connector for connecting the first printed circuit board and the second printed circuit board, and restrictions on the layout of each printed circuit board due to the connector can be eliminated.

  According to the present invention, since each printed circuit board is connected with the anisotropic conductive sheet sandwiched therebetween, it is possible to facilitate assembly and disassembly of the printed circuit board while relaxing restrictions on the layout of the printed circuit board.

It is the figure which looked at the temperature controller which concerns on embodiment from the front. It is the figure which looked at the temperature controller which concerns on embodiment from back. It is the figure which looked at the temperature controller which concerns on embodiment from the side. It is a decomposition | disassembly side view of the temperature controller which concerns on embodiment. It is an exploded plan view of the temperature controller according to the embodiment. It is the figure which looked at the 1st printed circuit board from back. FIG. 7A is a partially enlarged view of the second printed circuit board when viewed from the side, and FIG. 7B is a view of the second printed circuit board of FIG. 7A viewed from the front. It is explanatory drawing which shows the middle stage of manufacture of a 2nd printed circuit board. It is the figure which looked at the state which combined the 1st printed circuit board and the 2nd printed circuit board from back. FIG. 10A is a plan view of the anisotropic conductive sheet, and FIG. 10B is a cross-sectional view of the anisotropic conductive sheet. It is the figure which looked at the temperature controller which connected the external terminal from the side. It is a schematic perspective view of an external terminal.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a control device according to the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, a case where a temperature controller is employed as a control device will be described. However, as a control device, a measuring instrument such as a timer or a pressure gauge is employed, as described below, assembling a printed circuit board. As long as it can be disassembled, various devices can be employed. The temperature controller according to the embodiment is a device that controls the temperature by outputting to a heater or the like in response to an input from a temperature sensor, a thermocouple, or the like. In the following description, unless otherwise specified, “upper”, “lower”, “left”, “right”, “front”, and “rear” are used with reference to directions indicated by arrows in the drawings. However, the direction of each component in the following embodiments is merely an example, and can be changed to an arbitrary direction.

  1-3 is a figure which shows the temperature controller which concerns on embodiment, FIG. 1 is the figure seen from the front, FIG. 2 is from the back, and FIG. 3 is the figure seen from the side. As shown in FIGS. 1 to 3, the temperature controller (control device) 10 includes a front case 11 (case, not shown in FIG. 2) and a rear case 12 (case, not shown in FIG. 1). Yes.

  On the front side of the front case 11, a display area for displaying measured values and set values, buttons operated by an operator, and the like are provided. The rear case 12 includes a square cylindrical rectangular tube portion 12a extending in the front-rear direction, and a flange portion 12b provided in front of the rectangular tube portion 12a. A plurality of partition plates 12c extending in the left-right direction are formed at the rear of the rectangular tube portion 12a. The partition plates 12c are provided side by side at a predetermined interval, and connection terminals 40 described later are disposed between the partition plates 12c adjacent in the vertical direction.

  FIG. 4 is an exploded side view of the temperature controller according to the embodiment, and FIG. 5 is an exploded plan view of the temperature controller according to the embodiment. As shown in FIG. 4, the front case 11 includes support piece portions 15 that extend rearward from two positions on the upper and lower sides on the rear surface side. As shown in FIG. 5, outer support holes 15 a that extend linearly in the front-rear direction are formed on both the left and right sides of the support piece 15. In the support piece 15, inner support holes 15 b that are U-shaped in top view are formed on the inner side in the left-right direction from the outer support holes 15 a. Each of the support holes 15a and 15b is formed so as to penetrate in the thickness direction of the support piece 15 and is similarly formed in each of the upper and lower support pieces 15.

  Claw portions 11a are formed on the upper and lower surfaces of the front case 11 (the lower claw portion is not shown in FIG. 5). On the other hand, square holes 12d (the lower square holes are not shown in FIG. 5) capable of receiving the claw portions 11a are formed on the upper and lower sides of the flange portion 12b in the rear case 12. The front case 11 and the rear case 12 are assembled in the state shown in FIG. 3 by receiving and fitting the claw portion 11a into the square hole 12d.

  The temperature controller 10 includes a first printed circuit board 21 having a main surface formed in the vertical and horizontal directions, and two second printed circuit boards 22 having a main surface formed in the vertical and longitudinal directions. And. Each printed circuit board 21 and 22 is accommodated inside the front case 11 and the rear case 12 in an assembled state. At this time, the front end surface of the second printed circuit board 22 faces the rear surface (rear main surface) of the first printed circuit board 21, and they are electrically connected via the anisotropic conductive sheet 23. A connection method will be described later.

  On the front surface (front main surface) of the first printed board 21, a lamp and a display for forming the above-described display area are mounted in addition to the switch corresponding to the above-described button.

  FIG. 6 is a view of the first printed circuit board as viewed from the rear. As shown in FIG. 6, the 1st printed circuit board 21 is formed in a substantially square shape, and the convex part 21a is formed in the upper and lower ends 2 each. These convex portions 21a are received and fitted inside the inner support holes 15b (see FIG. 5) of the support piece portion 15, and the first printed circuit board 21 is supported by the support piece portion 15 in this fitted state. At the upper and lower ends of the first printed circuit board 21, concave portions 21b are formed on the outer sides in the left-right direction from the convex portions 21a. A plurality of pads 24 are formed on the rear surface of the first printed circuit board 21 so as to be lined up and down at predetermined intervals. The pad 24 is formed of a copper foil or the like and constitutes a part of the conductor pattern of the first printed board 21. In addition, in each figure showing the 1st printed circuit board 21 and the 2nd printed circuit board 22 including FIG. 6, the conductor pattern formed in those surfaces has illustrated only one part as needed.

  Returning to FIG. 4, concave notches 22 a are formed at the front positions at the upper and lower ends of the second printed circuit board 22. In addition, inclined edges 22b are formed from the front end toward the rear at both upper and lower ends of the second printed circuit board 22. By forming the notch portion 22a and the inclined edge 22b, the region in front of the notch portion 22a is made the insertion portion 22c so that it can be inserted into the outer support hole 15a (see FIG. 5). In the insertion portion 22c, an inclined edge 22b is formed from the front end of the second printed circuit board 22 toward the rear, and the inclined edge 22b serves as a guide for inserting the insertion portion 22c into the outer support hole 15a.

  FIG. 7A is a partially enlarged view of the second printed circuit board when viewed from the side, and FIG. 7B is a view of the second printed circuit board of FIG. 7A viewed from the front. As shown in FIG. 7A, a plurality of pads 26 are formed in a line along the front end at a position along the front end on the side surface (side main surface) that is the outer side in the left-right direction of the second printed circuit board 22. ing. Insulating recesses 27 (notches) are formed between the adjacent pads 26 in the vertical direction so as to be notched in a concave shape. On the upper side of the uppermost insulating recess 27 and on the lower side of the lowermost insulating recess 27, protrusions 28 protruding forward are formed. The protrusions 28 can be inserted into the recesses 21b (see FIG. 6) of the first printed circuit board 21, and when the protrusions 28 are inserted into the recesses 21b, the upper and lower sides of the second printed circuit board 22 with respect to the first printed circuit board 21. And the displacement in the left-right direction is restricted.

  Between the upper and lower protrusions 28, a receiving portion 30 is formed which is recessed in a vertically elongated region. An anisotropic conductive sheet 23 (see FIG. 4) is received inside the receiving portion 30. The depth (front / rear width) of the receiving portion 30 is formed larger than or substantially the same as the thickness of the anisotropic conductive sheet 23.

  As shown in FIGS. 7A and 7B, an end surface pad 32 is formed on the front end surface between the insulating recesses 27 adjacent to each other in the vertical direction so as to continue to the pad 26. The pads 26 and the end surface pads 32 that are connected to each other are electrically connected. Insulation is ensured by the insulating recesses 27 in the upper and lower adjacent end surface pads 32.

  Here, the production of the second printed circuit board 22 will be described below with reference to FIG. FIG. 8 is an explanatory view showing a middle stage of the production of the second printed circuit board. As shown in FIG. 8, a plurality of second printed circuit boards 22 are impositioned on a substrate P having a predetermined size, and a required conductor pattern including pads 26 is formed. V cuts C are made at the positions indicated by the dotted lines in FIG. 8, that is, at the upper and lower ends of the second printed circuit board 22 and around the protrusions 28. In the substrate P, a hole B is formed by die cutting at a position corresponding to the notch 22a and the inclined edge 22c, and a long hole D is formed by die cutting at a position adjacent to the front of the pad 26. Then, through-hole plating is performed to apply conductive plating to the inner wall of the long hole D.

  Then, after dividing into V cuts C, a processing device such as a router is used to form insulating recesses 27 shown in FIG. By forming the insulating recess 27, the through-hole plating is separated into a plurality of parts by the insulating recess 27, and each of the separated through-hole platings is formed as the end surface pad 32.

  FIG. 9 is a view of a state in which the first printed board and the second printed board are combined as seen from the rear. As shown in FIG. 9, the anisotropic conductive sheet 23 is formed in a vertically elongated shape along the left and right ends of the rear surface of the first printed circuit board 21, and is provided so as to contact and cover all the pads 24. 4 and 5, the anisotropic conductive sheet 23 is represented with a halftone dot for convenience of illustration. As shown in FIGS. 4 and 5, the anisotropic conductive sheet 23 is sandwiched between the rear surface of the first printed circuit board 21 and the front end surface of the second printed circuit board 22. In this sandwiched state, the anisotropic conductive sheet 23 is received inside the receiving portion 30 (not shown in FIG. 5) and is in contact with the bottom side of the receiving portion 30 having a concave shape. That is, the rear surface of the anisotropic conductive sheet 23 is in surface contact with the end surface pad 32 formed on the bottom side of the receiving portion 30, and the front surface of the anisotropic conductive sheet 23 is in surface contact with the pad 24 of the first printed circuit board 21. .

  FIG. 10A is a plan view of the anisotropic conductive sheet, and FIG. 10B is a cross-sectional view of the anisotropic conductive sheet. The anisotropic conductive sheet 23 includes a sheet main body 33 made of an insulator such as a resin, and a plurality of conductors 34 made of a conductor that penetrates in the thickness direction of the sheet main body 33. An example of the material of the sheet body 33 is silicon rubber, and an example of the conductor 34 is a gold-plated wire. The plurality of conductors 34 are provided at predetermined intervals in two orthogonal directions in the plane of the sheet main body 33. The anisotropic conductive sheet 23 exhibits conductivity by the conductor 34 in the thickness direction of the sheet body 33 and exhibits insulation between the conductors 34 by the sheet body 33 in the surface direction of the sheet body 33. . The anisotropic conductive sheet 23 may adopt another configuration as long as anisotropy that is conductive in the thickness direction and insulative in the plane direction is formed.

  Returning to FIG. 4, the second printed circuit board 22 includes a plurality (six in this embodiment) of connection terminals 40 formed in a tab shape at the rear end. The connection terminal 40 includes an insertion portion 41 that has a rectangular shape and protrudes backward, and a conductive surface portion 42 that is formed on at least one of the left and right surfaces of the insertion portion 41. The outer edge of the insertion portion 41 is formed by processing such as die cutting when manufacturing the second printed circuit board 22, and the conductive surface portion 42 is formed as a part of the conductor pattern on the second printed circuit board 22. Accordingly, the insertion portion 41 and the conductive surface portion 42 are integrally connected to the second printed circuit board 22 and formed as a part of the second printed circuit board 22. A gap is formed between the connection terminals 40 adjacent in the vertical direction, and the partition plate 12c is disposed in the gap (see FIG. 3).

  Here, the external terminal 50 connected to the connection terminal 40 will be described with reference to FIGS. 11 and 12. FIG. 11 is a side view of a temperature controller to which an external terminal is connected. FIG. 12 is a schematic perspective view of the external terminal. In the present embodiment, external terminal 50 is configured by a crimp terminal joined to one end of electric wire 51 by crimping. The external terminal 50 includes a flat plate portion 50a formed substantially flat and a rising portion 50b formed by bending both ends of the flat plate portion 50a in the width direction. The leading end side of the rising portion 50b is formed in a semicircular arc shape. A gap that is substantially the same as the thickness of the connection terminal 40 (not shown in FIG. 12) is formed between the tip of the rising portion 50b and the flat plate portion 50a, and this gap serves as the insertion portion 50c. The inserted portion 50c receives the upper and lower ends of the connection terminal 40 extending in the front-rear direction, and the insertion portion 41 is inserted into the inserted portion 50c. In this state, the external terminal 50 and the conductive surface portion 42 (not shown in FIG. 12) come into contact with each other and can be energized.

  By the way, in connection of the conventional external wiring, the terminal block was provided in the printed circuit board by insertion mounting, and the round crimp terminal was connected to the screw part of this terminal block. In this connection, there are problems such as complicated screw attachment / detachment, loss of screws and breakage of screw threads. In this regard, according to the connection terminal 40 of the above-described embodiment, the connection and release thereof can be performed easily and in a short time by the operation of inserting and removing the external terminal 50. In addition, since the connection terminal 40 is formed as a part of the second printed circuit board 22, the manufacturing process and the structure can be simplified, and the product cost can be reduced.

  Then, the assembly method of the temperature controller 10 is demonstrated. First, in FIG. 5, the first printed circuit board 21 is accommodated in the front case 11, and the convex portion 21 a is received inside the inner support hole 15 b of the support piece 15. Thereby, the displacement in the front-rear direction of the first printed circuit board 21 in the front case 11 is restricted.

  Next, the anisotropic conductive sheet 23 is disposed at a position corresponding to the pad 24 (see FIG. 9) on the rear surface of the first printed circuit board 21, and then the front end surface of the second printed circuit board 22 is disposed on the rear surface of the first printed circuit board 21. Face each other. Then, the insertion portion 22c is inserted and fitted into the outer support hole 15a while the projection 28 of the second printed circuit board 22 is inserted and fitted into the recess 21b (see FIG. 6) of the first printed board 21. . Thereby, the displacement of the first printed circuit board 21 with respect to the front case 11 is restricted, and the displacement of the second printed circuit board 22 with respect to the front case 11 and the first printed circuit board 21 is also restricted. Accordingly, while the printed boards 21 and 22 are assembled, they are assembled as a unit in which the front case 11 is integrated.

  In this state, the anisotropic conductive sheet 23 is sandwiched between the pad 24 (refer to FIG. 6) of the first printed circuit board 21 and the end surface pad 32 (refer to FIG. 7) of the second printed circuit board 22, and the pad 24 and the end surface pad. 32 is electrically connected. In other words, the pad 24 and the end surface pad 32 are energized through the conductor 34 (see FIG. 10) of the anisotropic conductive sheet 23. In addition, since the anisotropic conductive sheet 23 exhibits insulation in the surface direction, a short circuit does not occur between the pads 24 and the end surface pads 32.

  The unit of the front case 11 and the printed circuit boards 21 and 22 assembled as described above is inserted into the rear case 12 from the rear end side of the second printed circuit board 22. Then, the front case 11 and the rear case 12 are assembled by receiving and fitting the claw portion 11a into the square hole 12d. In this state, as shown in FIG. 3, the connection terminals 40 are arranged and exposed between the partition plates 12 c adjacent in the vertical direction.

  When disassembling each printed circuit board 21, 22, first, using a tool or the like, the fitting of the square hole 12d and the claw portion 11a is released, the rear case 12 and the front case 11 are disassembled, and each printed circuit board 21 is disassembled. , 22 are extracted from the rear case 12. Then, while intentionally expanding the upper and lower support pieces 15 in the front case 11 in the vertical direction, the second printed circuit board 22 is pulled backward so as to extract the insertion portion 22c from the outer support hole 15a. Accordingly, the positioning of the outer support hole 15a and the insertion portion 22c is released, and the second printed circuit board 22 is disassembled from the first printed circuit board 21.

  As described above, according to the above-described embodiment, soldering can be eliminated when assembling the printed boards 21 and 22. Thereby, the labor for assembling and disassembling each printed circuit board 21 and 22 can be reduced, and the connection state can be stably maintained. In addition, since the connectors are connected without being mounted, the degree of freedom of the component mounting layout can be improved on each of the printed boards 21 and 22 because the connectors are not mounted.

  The present invention is not limited to the above embodiment, and can be implemented with various modifications. Moreover, there is no restriction | limiting in particular about the numerical value, dimension, material, and direction which were demonstrated by the said embodiment. Other modifications may be made as appropriate without departing from the scope of the object of the present invention.

  For example, as long as the connection terminal 40 is formed integrally with the second printed circuit board 22 as in the above-described embodiment, various shapes such as a semicircular tip formed in a side view are adopted. Can do.

  Further, the number of the second printed board 22 may be one, or three or more may be provided and connected to the first printed board 21. Further, the orientation of the second printed circuit board 22 may be changed such that it is directed in the horizontal direction.

  Moreover, the recessed part 27 is good also as another shape, as long as the adjacent end surface pad 32 is isolate | separated by a notch.

10 Temperature controller (control device)
11 Front case
12 Rear case (case)
21 First printed circuit board 22 Second printed circuit board 23 Anisotropic conductive sheet 24 Pad 27 Insulation recess
30 receiving portion 32 end pad 40 connecting terminal 41 insertion portion 50 external terminal 50c insertion portion

Claims (5)

Control comprising a first printed circuit board and a second printed circuit board electrically connected to the first printed circuit board, and assembling in a state where the end surface of the second printed circuit board faces the main surface of the first printed circuit board In the equipment
A control device, wherein a pad is provided on each of a main surface of the first printed circuit board and an end surface of the second printed circuit board, and an anisotropic conductive sheet is sandwiched between the pads to energize the pads. It further includes a connection terminal to which a predetermined external terminal is connected,
The external terminal includes a plugged portion that receives a terminal extending in a predetermined direction and can be energized with the terminal,
The connection terminal includes an insertion portion formed as a part of the second printed circuit board, and the insertion portion is formed in a shape capable of being energized by being inserted into the insertion portion. The control device according to claim 1.   The control device according to claim 1, wherein a receiving portion that receives the anisotropic conductive sheet is formed on the end surface of the second printed circuit board.   4. The control device according to claim 1, wherein the pad of the second printed circuit board is divided into a plurality of parts by notches. 5.   The control device according to claim 1, wherein a plurality of the connection terminals are formed in a tab shape.

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