JP2007242567A - Circuit board structure and electric junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board structure with higher density of a circuit board improved and with improved freedom of wiring in circuit patterns formed on the circuit board as well as an electric junction box. <P>SOLUTION: In the circuit board structure, a concave part 5a is formed on a bottom face of a terminal holder 5, a space part 7 penetrating through a front side and a rear side is formed between the concave part 5a of the terminal holder 5 and a surface of the circuit board 1, and the space part 7 is made in a size enabling to mount such low-profile components as resistors, diodes, and capacitors on the circuit board 1 inside the space part 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a circuit board structure and an electrical junction box, and more particularly to a circuit board structure and an electrical junction box in which a space is formed between a circuit board and a bottom surface of a terminal holder.

  In general, an electrical junction box used for a vehicle or the like includes an upper case, a lower case, and a circuit board accommodated between the upper case and the lower case.

  6A and 6B are perspective views showing a conventional circuit board structure, where FIG. 6A shows a state before the terminal holder is attached to the circuit board, and FIG. 6B shows a state where the terminal holder is attached to the circuit board. FIG. 8 is a plan view showing a conventional circuit board structure, (A) shows a state before the terminal holder is attached to the circuit board, (B) shows a state where the terminal holder is attached to the circuit board, and FIG. It is a VII-VII line sectional view of 7 (B).

  As shown in FIGS. 6 and 7, various mounting components 52 such as a relay 51, a resistor, a diode, and a capacitor are mounted on a circuit board 50, and a circuit such as a signal control system electrical circuit or a power control system electrical circuit. Is formed. Each circuit is bent in a substantially L shape, and a plurality of terminals 53 connected to a connector or a fuse are joined. Each terminal 53 is held by a terminal holder 54. The terminal holder 54 is fixed to the circuit board 50 with screws 56 or the like (see FIG. 8).

  In the conventional circuit board structure, as shown in FIG. 8, a recess 54 a is formed on the bottom surface of the terminal holder 54, and the front side and the back side are provided between the recess 54 a of the terminal holder 54 and the surface of the circuit board 50. A penetrating space 55 is formed. The space portion 55 plays a role of improving solder blowing-up in the flow soldering process, draining water accumulated on the circuit board 50 due to dew condensation in the electrical connection box, and absorbing warpage generated in the circuit board 50. (Hereinafter, this technique is referred to as Conventional Example 1).

  Patent Document 1 discloses a connector device having a connector protruding in three orthogonal directions and mounting an electronic component in a space between the connector extending in the horizontal direction from the base and the substrate. (Hereinafter, this technique is referred to as Conventional Example 2).

Further, Patent Document 2 includes an insulator, a plurality of contacts fixed to the insulator, and an alignment plate (locator) for aligning terminal portions of the plurality of contacts. The alignment plate includes a plurality of contacts. A connector is disclosed in which a plurality of holes into which the terminal portions are inserted are formed. Paragraph 0018 of the specification of Patent Document 2 describes that an electronic component is mounted below the connector (hereinafter, this technique is referred to as Conventional Example 3).
JP-A-8-96902 JP 2002-42935 A

  Terminal holders such as connector terminal holders are components that occupy a large area among the mounting components mounted on the substrate, which has been one factor that hinders the increase in the density of circuit boards. In addition, low-profile parts such as resistors, diodes, and capacitors are a cause of detracting from the freedom of routing of circuit patterns formed on the circuit board, and are placed near the terminals that serve as input / output parts. It is desirable to do.

  Therefore, it is conceivable to effectively use the space formed between the bottom surface of the terminal holder and the surface of the substrate.

  However, since the height H2 of the space portion 55 of the conventional example 1 only needs to fulfill the above-described role, it is usually as low as about 1.5 mm from the surface of the circuit board 50, and the circuit in such a narrow space portion 55 is used. It was practically difficult to mount low-profile components such as resistors, diodes, and capacitors on the substrate 50.

  In Conventional Example 2, the space portion for mounting the electronic component is formed between the connector extending in the horizontal direction from the base portion and the substrate, and the space portion penetrating the bottom surface of the base portion is not formed. . Therefore, with the structure of the conventional example 2, it is difficult to increase the density of the circuit board.

  In Conventional Example 3, it is not clearly disclosed in the specification and the drawings as to how the electronic component is mounted below the connector. In addition, since the alignment plate (locator) is configured to enter the bottom surface of the insulator, the space between the bottom surface of the insulator and the substrate is reduced correspondingly, and the mountable electronic components are limited. There is.

  The present invention has been made to solve the above-described problems, and has a circuit board structure and an electrical junction box that can increase the density of circuit boards and improve the degree of freedom of circuit pattern formation on the circuit boards. The purpose is to provide.

  The circuit board structure of the present invention is a circuit board structure having a circuit board, a terminal attached to the circuit board, and a terminal holder for holding the terminal, between the circuit board and the bottom surface of the terminal holder. A space portion penetrating the front side and the back side of the terminal holder is formed, and a low-profile component is installed on a circuit board in the space portion.

  The terminal holder may be provided on the circuit board, and a concave portion constituting the space portion may be formed on a bottom surface thereof.

  The terminal holder is, for example, a connector terminal holder.

  The low-profile component may be a component used for an electric circuit of a signal control system.

  The electrical junction box of the present invention is characterized by having a board assembly provided with the circuit board structure and a case for fixing and storing the board assembly.

  According to the circuit board structure according to the embodiment of the present invention, a space portion penetrating the front side and the back side of the terminal holder is formed between the circuit board and the bottom surface of the terminal holder, and a circuit in the space portion is formed. Since low-profile components are installed on the board, it is possible to improve the density of the circuit board.

  In addition, since the low-profile parts are arranged near the terminals serving as the input / output units, it is possible to improve the degree of freedom in arranging the circuit patterns on the circuit board.

  According to the electrical junction box according to the embodiment of the present invention, since the board assembly including the circuit board structure having a high density is accommodated in the case, the functionality of the electrical junction box is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a circuit board structure according to an embodiment of the present invention, in which (A) shows a state before the terminal holder is attached to the circuit board, and (B) shows the terminal holder attached to the circuit board. FIG. 2 is a perspective view of the circuit board structure according to the embodiment of the present invention as seen from the back side, and FIG. 3 is a plan view showing the circuit board structure according to the embodiment of the present invention. (A) shows a state before the terminal holder is attached to the circuit board, (B) shows a state where the terminal holder is attached to the circuit board, and FIG. 4 is a cross-sectional view taken along line III-III in FIG. It is.

  As shown in FIG. 1 to FIG. 3, various mounting components 3 such as a relay 2, a resistor, a diode, a capacitor, and a semiconductor component are mounted on a circuit board 1, and an electric circuit of a signal control system and an electric power of a power control system A circuit such as a circuit is formed. Each circuit is bent in a substantially L shape, and a plurality of terminals 4 connected to the connector are joined. Each terminal 4 is held by a terminal holder 5 attached to the circuit board 1. A hollow fitting portion 6 is provided on the front side of the terminal holder 5 so as to surround the tip of the terminal 4 and to which a connector is fitted.

  The terminal holder 5 is fixed to the circuit board 1 with screws 12 or the like (see FIG. 4).

  In the circuit board structure according to the embodiment of the present invention, as shown in FIG. 4, a recess 5 a is formed on the bottom surface of the terminal holder 5, and the front surface is provided between the recess 5 a of the terminal holder 5 and the surface of the circuit board 1. A space 7 that penetrates the side and the back side is formed, and the space 7 is large enough to mount a low-profile component 3 a such as a resistor, a diode, or a capacitor on the circuit board 1 in the space 7. Is formed.

  The height H1 of the space 7 is set within a range of 3 mm to 15 mm (preferably about 5 mm) from the surface of the circuit board 1 in relation to the height of the low-profile component 3a.

  On the contrary, the low-profile component 3a may be any component as long as it is a mounted component housed in the space 7.

  Further, a plurality of space portions 7 may be formed by forming a plurality of recesses 5 a on the bottom surface of the terminal holder 5.

  The space portion 7, like the conventionally formed space portion 7, is improved in the solder blowing performance in the flow soldering process, drains water accumulated on the circuit board 1 due to dew condensation in the electrical connection box, It also plays a role of absorbing warpage generated in the circuit board 1.

  The terminal holder 5 is applied not only to a connector terminal holder but also to a fuse terminal holder for holding a fuse terminal.

  Moreover, it is preferable that the low profile part 3a mounted in the space part 7 is a part used for the electric circuit of a signal control system. As a result, the components used in the electric circuit of the signal control system can be arranged near the periphery of the circuit board 1, and the electric circuit of the power control system that requires a wide pattern width can be arranged in the center of the circuit board 1. Therefore, the density of the circuit board 1 can be improved.

  Further, the low-profile component 3a mounted in the space 7 may be a heat-generating component such as a semiconductor component. In this case, the terminal holder 5 is preferably a connector terminal holder. This is because heat from the heat-generating component can be radiated through the connector electric wire (wire harness) connected to the connector terminal holder.

  According to the circuit board structure according to the embodiment of the present invention, the space portion 7 penetrating the front side and the back side of the terminal holder 5 is formed between the circuit board 1 and the bottom surface of the terminal holder 5. Since the low-profile component 3a is installed on the circuit board 1 in the space 7, it is possible to improve the density of the circuit board 1.

  In addition, since the low-profile component 3a is disposed near the terminal serving as the input / output unit, the degree of freedom in arranging the circuit pattern on the circuit board 1 can be improved.

  FIG. 5 is a cross-sectional view showing an electrical junction box according to an embodiment of the present invention. As shown in FIG. 5, the electrical junction box 8 according to the embodiment of the present invention is made of resin or the like, and is housed in the upper case 9 and the lower case 10 that are coupled to each other, and the upper case 9 and the lower case 10, And the board assembly 11 having the circuit board structure according to the above-described embodiment of the present invention.

  According to the electrical junction box 8 according to the embodiment of the present invention, since the board assembly 11 having the circuit board structure with high density is accommodated in the upper case 9 and the lower case 10, electrical connection is achieved. The functionality of the box 8 is improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical matters described in the claims.

  For example, the terminal holder 5 is not necessarily attached to the circuit board 1 as long as the space 7 is formed between the terminal holder 5 and the circuit board 1, and may be fixed to the lower case 10, for example.

  The present invention is used, for example, in an electrical junction box mounted on a vehicle or the like.

It is a perspective view which shows the circuit board structure which concerns on the example of embodiment of this invention, (A) shows the state before attaching a terminal holder to a circuit board, (B) shows the state which attached the terminal holder to the circuit board. . It is the perspective view which looked at the circuit board structure concerning the embodiment of the present invention from the back side. It is a top view which shows the circuit board structure which concerns on the example of embodiment of this invention, (A) shows the state before attaching a terminal holder to a circuit board, (B) shows the state which attached the terminal holder to the circuit board. . It is the III-III sectional view taken on the line of FIG. It is sectional drawing which shows the electrical junction box which concerns on the example of embodiment of this invention. It is a perspective view which shows the conventional circuit board structure, (A) shows the state before attaching a terminal holder to a circuit board, (B) shows the state which attached the terminal holder to the circuit board. It is a top view which shows the conventional circuit board structure, (A) shows the state before attaching a terminal holder to a circuit board, (B) shows the state which attached the terminal holder to the circuit board. It is the VII-VII sectional view taken on the line of FIG.

Explanation of symbols

1: Circuit board 2: Relay 3: Mounted part 3a: Low profile part 4: Terminal 5: Terminal holder 5a: Recessed part 6: Fitting part 7: Space part 8: Electrical junction box 9: Upper case 10: Lower case 11: Board Assembly 12: Screw

Claims (5)

In a circuit board structure having a circuit board, a terminal attached to the circuit board, and a terminal holder for holding the terminal,
Between the circuit board and the bottom surface of the terminal holder, a space portion penetrating the front side and the back side of the terminal holder is formed,
Low-profile parts are installed on the circuit board in the space,
A circuit board structure characterized by that.   2. The circuit board structure according to claim 1, wherein the terminal holder is provided on the circuit board, and a concave portion forming the space portion is formed on a bottom surface thereof.   The circuit board structure according to claim 1, wherein the terminal holder is a connector terminal holder.   The circuit board structure according to any one of claims 1 to 3, wherein the low-profile component is a component used for an electric circuit of a signal control system. A board assembly comprising the circuit board structure according to any one of claims 1 to 4,
A case for fixing and storing the substrate assembly;
An electrical junction box characterized by comprising:

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