JP2018206999A - Housing structure of circuit board - Google Patents

Abstract

To provide a housing structure of a circuit board which can prevent biting of a cord with a simple structure.SOLUTION: A housing structure of a circuit board includes a circuit board 1 mounted with an electronic component 11, a case 2 housing the circuit board 1, a cord 3 connected to the circuit board 1, and an insulation sheet 4 interposed between the case 2 and the circuit board 1. The insulation sheet 4 is folded so as to enclose the cord 3, and housed in the case 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a circuit board housing structure.

  Conventionally, a printed circuit board (circuit board) printed with various electronic components is housed in a case. In this case, in order to use the case itself as a ground, the case is formed of a conductive material such as a metal body. Is common. Accordingly, a structure for accommodating and holding a printed board while interposing an insulating sheet between the copper foil (wiring pattern) or electronic component terminal of the printed board and the case is known, for example, disclosed in Patent Document 1 .

Japanese Utility Model Publication No. 58-12990

  For printed circuit boards, wiring made of film cords may be used for external input / output, connection between multiple boards, grounding, etc. This code may require a certain length for assembly. Yes, when assembling the case, it was necessary to assemble with care so that this cord would not get caught between the cases.

  In order to prevent the cord from being caught in the case, it is conceivable to use a binding member such as a clamp shape exclusively, but there is room for improvement because the number of parts increases.

  Accordingly, an object of the present invention is to provide a circuit board housing structure capable of preventing the biting of a cord with a simple structure by paying attention to the above-mentioned problems.

To achieve the above object, the circuit board housing structure according to the present invention comprises:
A circuit board for mounting electronic components;
A case for housing the circuit board;
A cord connected to the circuit board;
An insulating sheet interposed between the case and the circuit board;
With
The insulating sheet is folded so as to wrap the cord and is accommodated in the case.

Further, the case is provided by fitting the first and second cases,
The first case has an open part for facing an end of the circuit board,
The second case is characterized by surrounding the open portion so as to cover it.

The insulating sheet may be formed with a piece that overlaps the cord on the open side.

  According to the circuit board housing structure of the present invention, a simple assembly structure can be provided.

The figure which shows the case before case assembly | attachment of the electronic unit in embodiment of this invention. The figure which shows before folding of the insulating sheet of embodiment same as the above. The figure which shows after the folding of the insulating sheet of embodiment same as the above.

  Hereinafter, the circuit board housing structure of the present invention applied to an electronic unit will be described by way of example with reference to the accompanying drawings.

  The electronic unit A includes a circuit board 1, a case 2, a cord 3, and an insulating sheet 4.

  The circuit board 1 is a printed board on which a copper foil pattern such as wiring or land is printed and formed on a plate-like base material using a glass epoxy resin, and is not shown in detail. A component 11 and a fin 12 for heat dissipation are mounted. In this case, a plurality of circuit boards 1 are accommodated in the case 2, and are arranged apart from each other between the case 2 and the circuit board 1 via the spacers 5.

  The case 2 is formed by pressing a conductive plate made of a metal material into a predetermined shape, and covers the first case 21 for holding the circuit board 1 and the circuit board 1 as shown in FIG. Thus, the second case 22 for forming the accommodation space together with the first case 21 is fitted and further coupled to the screw hole 2a using a screw (not shown).

  The first case 21 is formed with a screw hole 21a for fixing and holding the electronic unit A and a wiring hole 21b for inserting a wiring for electrical connection with an external device. The first case 21 has an open portion 21c that exposes an end portion of the circuit board 1 so that the circuit board 1 and the cord 3 can be easily assembled.

  The second case 22 is assembled so as to cover the first case 21, and is further slid to be guided to a predetermined position with respect to the first case 21. The screw hole 2a of the second case 22 has a long hole shape, and can be assembled even if the screw is inserted into the screw hole 2a of the first case 21. Further, the second case 22 is configured so that heat from the electronic component 11 can be released by a slit 22a for allowing air to flow in and out of the electronic unit A.

  The cord 3 is a film cord connected to the circuit boards 1, and in this case, is provided to connect the circuit boards 1. The cord 3 is connected to the open portion 21c side of the circuit board 1, and at least one end of the cord 3 is in the first case in a state where both the circuit boards 1 to which the cord 3 is connected are assembled to the first case 21. The connector can be connected using the open portion 21c of 21.

  The insulating sheet 4 is made of an electrically insulating soft material sheet such as synthetic resin, and faces the substantially entire surface of the circuit board 1 on the first case 21 side between the circuit board 1 and the first case 21. Intervene. The insulating sheet 4 is positioned and held by forming holes 41 through which the plurality of spacers 5 for keeping the first case 21 and the circuit board 1 apart are formed. Even if the distance between the first case 21 and the mounting surface of the circuit board 1 is small, the insulating sheet 4 is electrically connected to the circuit board 1 and the electronic component 11 mounted thereon and the conductive first case 21. Can be ensured and can be downsized. The spacer 5 is composed of a boss shape protruding from the first case 21 and a separate cylindrical member. The spacer 5 maintains a separation distance between the circuit board 1 and the case 2 and Other configurations may be used as long as positioning in the sheet surface direction can be performed.

  Moreover, the insulating sheet 4 has the piece part 42 extended from the open part 21c, as shown in FIG. As shown in FIG. 3, the piece 42 is bent toward the first case 21 to wrap the cord 3 and prevent the cord 3 from protruding from the open portion 21 c. Therefore, when assembling the second case 22 to the first case 21, it is possible to fit the slide 3 while the cord 3 is accommodated by the piece portion 42, so that an operation such as suppressing the cord 3 is not necessary. Further, the insulation between the cord 3 and the circuit board 1 or the electronic component 11 can be enhanced by the insulating sheet 4.

  Further, the cord 3 is less likely to come out of the opening portion 21c by being guided between the insulating sheet 4 and the first case 21 to a desired path so as to pass between the boss-like spacers 5. In addition, by applying a transparent or translucent insulating sheet 4, the position and path of the cord 3 on the back surface side (first case 21 side) of the insulating sheet 4 can be visually recognized. Has the effect of improving.

  According to such an electronic unit A, the circuit board 1 on which the electronic component 11 is mounted, the case 2 that houses the circuit board 1, the cord 3 that is connected to the circuit board 1, and between the case 2 and the circuit board 1 And the insulating sheet 4 is folded so as to wrap the cord 3 and accommodated in the case 2.

  Therefore, the position of the flexible cord 3 can be regulated as desired with a simple structure without using a dedicated binding member. By fitting the cord 3 in a desired position, for example, assembly workability such as fitting of the case 2 can be improved.

  The case 2 is provided by fitting a plurality of cases 21 and 22, and the first case 21 has an open portion 21 c for facing the end of the circuit board 1, and the second case 22. In order to improve the workability of assembling the insulating sheet 4, the circuit board 1, the cord 3, etc. to the first case 21 by enclosing the open part 21 c, the open part 21 c for this purpose is further improved. The workability of covering and closing can be improved by the insulating sheet 4.

  In addition, the insulating sheet 4 can be easily bent by forming the piece 42 that overlaps the cord 3 on the open portion 21c side.

  The circuit board housing structure of the present invention has been described by way of example in the configuration of the above-described embodiment, but the present invention is not limited to this, and the gist of the present invention is also in other configurations. It goes without saying that various improvements and display changes can be made without departing from the scope of the invention.

  The present invention relates to a circuit board housing structure and is suitable, for example, as an electronic unit such as an electric facility, an information management facility, and a remote operation facility.

A Electronic unit 1 Circuit board 11 Electronic component 2 Case 21 First case 22 Second case 21c Open part 3 Code 4 Insulating sheet 41 Single part

Claims (3)

A circuit board for mounting electronic components;
A case for housing the circuit board;
A cord connected to the circuit board;
An insulating sheet interposed between the case and the circuit board;
With
The circuit board housing structure, wherein the insulating sheet is folded so as to wrap the cord and housed in the case. The case is provided by fitting the first and second cases,
The first case has an open part for facing an end of the circuit board,
The circuit board housing structure according to claim 1, wherein the second case is enclosed so as to cover the open portion. The circuit board housing structure according to claim 2, wherein the insulating sheet is formed with a piece that overlaps the cord on the open portion side.

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