JP2014086603A - Housing structure of on-vehicle electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem of conventional general structure that when a mounting component in close proximity to the end face of a printed circuit board is connected electrically with a connector connection pin by partial jet solder, the case sidewall touches the solder and is burnt or melted, and to solve such a problem that since the solder goes around the back side of the printed circuit board, a sufficient distance is required between the case sidewall and the printed circuit board end face and the mounting component, and thereby the size of the printed circuit board, the base and the cover is increased thus causing cost increase.SOLUTION: A housing structure of on-vehicle electronic apparatus has a printed circuit board 4 for mounting an electronic component, and a housing 1 for incorporating the printed circuit board 4. The housing 1 is divided by a case 3 and a cover 2 in a plane parallel with the surface of the printed circuit board 4. The case 3 supporting the printed circuit board 4 has a column 3e having a seating face 3b for holding the printed circuit board 4, and the seating face 3b is set at a position higher than the split face 3d of the housing.

Description

  The present invention relates to a housing structure of an in-vehicle electronic device, and more particularly, to a structure that can be downsized, reduce the number of parts, reduce costs, and improve the quality of printed circuit boards, molds, and soldering. .

It is desirable to use screw-less or lead-free solder for in-vehicle electronic devices mounted on automobiles from the viewpoint of reducing the number of parts and reducing environmental load substances. Also, in recent years, as a means for realizing higher performance and lower fuel consumption of automobiles, electronic devices in consideration of downsizing and thinning are required in order to ensure high layout performance from the reduction of mounting space accompanying reduction in vehicle weight. . Furthermore, to reduce the number of components, reduce the size of components, and reduce the size of printed circuit boards, the structure that integrates the chassis and connector can reduce the number of components and increase the strength and thinness of the connector, enabling high layout. It becomes.
However, even in the case of the above structure, good quality is required for the printed circuit board, the housing, and the soldering.

  As an electronic device having a structure in which this type of housing and connector are integrated, there is one disclosed in Patent Document 1. In the one shown in Patent Document 1, the printed circuit board is fixed on the same plane or the bottom side of the housing holding the printed circuit board with respect to the divided surface of the housing containing the printed circuit board, The connector connection pins are placed by inserting them into the mounting holes on the printed circuit board, and solder is partially sprayed onto the parts to secure the electrical connection between the connector and the circuit on the printed circuit board. It was.

Japanese Patent No. 3748253 ([0005], [0006], FIG. 4)

In the above-mentioned invention of Patent Document 1, the printed circuit board is housed by a housing composed of a base and a cover. However, in the above structure, there is a housing side surface or a divided surface at a position close to the printed circuit board end surface. 8, when the printed circuit board 15 and the connector connection pin 18 are electrically connected to the connector connection pin 18 by the partial jet solder 19 as shown in FIG. 8, the case side wall 14b contacts the solder 20 and the case side wall 14b There was a problem of burning or melting.
In addition, since solder flows around the back side of the printed circuit board 15, it is necessary to provide a sufficient distance between the case side wall 14 b and the end surface of the printed circuit board 15 and the mounting component 16, and thereby the size of the printed circuit board 15, the base 13, and the cover 14. There is a problem that the increase in cost leads to an increase in cost, and there is a limitation in design and layout.

  Also, in the case of a complicated connector shape that has a structure in which the connector shape slides from the inside such as a lock mechanism in the above structure, the mold is parallel to the bottom surface of the housing because the housing side wall is at the same height as the connector height. In addition, there are cases in which the shape of the connector cannot be configured due to restrictions on the direction of die removal, such as failure to pull inward.

  Furthermore, in the above structure, since the side surface of the casing is located close to the end face of the printed circuit board, after mounting the printed circuit board to the casing, the state of the mounting surface on the contact surface side with the casing on the printed circuit board is visually confirmed. It was difficult.

  The present invention has been made in view of the above-described problems, and the board area and the housing size are reduced by increasing the mounting area by reducing the solder stagnation avoidance region, and the housing and the complex connector are integrally formed. Providing a housing structure that can improve the quality of the printed circuit board and shorten the inspection time by enabling the visual confirmation of the state of both the front and back sides of the printed circuit board after the connector structure and the printed circuit board are soldered. The purpose is to do.

  The present invention includes a printed circuit board on which an electronic component is mounted and a housing containing the printed circuit board, and the housing is a housing component on the side that holds the printed circuit board in a plane parallel to the printed circuit board surface. And a casing component combined with a casing component on the side that holds the printed circuit board. Of the two casing components, the casing component on the side that holds the printed circuit board is printed A pillar having a seating surface for holding the board is provided, and the seating surface is set at a position closer to the housing component side combined with the housing component on the side holding the printed circuit board than the division surface of the housing. It is what.

  According to the present invention, by setting the seat surface of the column holding the printed circuit board closer to the housing component side combined with the housing component on the side holding the printed circuit board than the divided surface of the housing, Space for partial jet solder can be secured, and the printed circuit board and housing can be downsized, reducing costs, and after connecting the connector connection pins and the printed circuit board by soldering, both front and back sides of the printed circuit board By visually confirming the state, there is an effect that the quality can be improved.

It is a disassembled perspective view which shows the housing structure of the electronic device which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the housing structure of the electronic device before the cover assembly | attachment which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the housing structure of the electronic device after the cover assembly | attachment which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the implementation condition of the partial jet solder which concerns on Embodiment 1 of this invention. It is a top view of the printed circuit board in the housing | casing structure of the electronic device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the housing structure of the electronic device which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the housing structure of the electronic device which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the partial jet solder in the housing | casing of the electronic device generally used.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing an overall configuration of a housing structure of an in-vehicle electronic device according to the present invention, FIG. 2 is a side sectional view showing a state before the housing is assembled, and FIG. 3 is a state after the housing is assembled. FIG. FIG. 4 is a side view showing a state during partial jet soldering, and FIG. 5 is a top view of the printed circuit board.
In FIG. 1 to FIG. 3, the housing 1 is composed of a housing component consisting of a case 3 and a housing component consisting of a cover 2. The case 3 has a rectangular cylindrical peripheral wall portion 3y extending vertically upward from the peripheral edge of the plate-like bottom portion 3x, and the upper peripheral edge of the peripheral wall portion 3y forms an opening upward. At four corners of the peripheral wall portion 3y, pillars 3e having a seat surface 3b for holding the printed circuit board 4 on the upper surface are provided in parallel with the peripheral wall portion 3y. The cover 2 has a square cylindrical peripheral wall portion 2y extending vertically downward from the peripheral edge of the plate-like lid portion 2x, and the lower peripheral edge of the peripheral wall portion 2y forms an opening downward.
The cover 2 is combined as a housing 1 in which the lower peripheral edge of the peripheral wall portion 2y is fitted to and combined with the upper peripheral edge of the peripheral wall 3y in the case 3, and in the combined state of the cover 2 and the case 3, the lower portion of the peripheral wall portion 2y in the cover 2 The opening and the upper opening of the peripheral wall 3y in the case 3 coincide with each other, and the internal space of the housing 1 is closed. In the closed state of the housing 1, the upper peripheral edge of the peripheral wall portion 3 y in the case 3 and the lower peripheral edge of the peripheral wall portion 2 y in the cover 2 constitute a fitting portion that fits in a fixed state. Hold closed.
When the combined state of the cover 2 and the case 3 is eliminated, the cover 2 is moved upward, and the lower peripheral edge of the peripheral wall portion 2y in the cover 2 is separated from the upper peripheral edge of the peripheral wall portion 3y in the case 3. It becomes. The upper surface of the peripheral wall 3y in the case 3 forms a dividing surface 3d.
The upper surface of the pillar 3 e, that is, the seating surface 3 b that holds the printed circuit board 4 is provided at a position higher than the dividing surface 3 d of the housing 1. Further, the printed circuit board 4 is provided with an engaging portion made up of a U-shaped notch 4a, and the printed circuit board 4 is press-fitted into the rib 3c protruding from the seating surface 3b. It is engaged with the pillar 3e and fixed to the case 3. The external size in the vertical or horizontal direction of the printed circuit board 4 can be the same or slightly larger than the internal dimension of the case 3 on a horizontal plane defined by the peripheral wall 3y in the case 3.
As shown in FIG. 5, two engaging portions each having a U-shaped notch 4 a in the printed circuit board 4 are provided on both sides of the printed circuit board 4, and each is press-fitted to each of the four pillars 3 e. It is what is done. The printed circuit board 4 is extended and held in a horizontal plane by the four pillars 3 e and is fixed to the case 3.
After the printed circuit board 4 is fixed to the case 3, the terminals 5 of the mounting component (not shown) set on the printed circuit board 4 are connected to the printed circuit board 4 and the mounting component by partial jet solder 19 as shown in FIG. The terminals 5 are electrically connected by soldering 20.

As shown in FIGS. 2 and 3, the case 3 has a fitting rib 3a and the cover 2 has a fitting hook 2a. The case 3 and the cover 2 are fixed by fitting them. Yes. The fitting hook portion may be a through hole, or may not penetrate like a groove or a recess. 2 and 3, the case may be provided with a fitting hook portion and the cover may be provided with a fitting rib.
In addition, although the example of the press-fitting of the rib 3c and the U-shaped notch 4a is shown as the engaging part by the fitting of the printed circuit board 4 and the case 3, a fitting hole is used instead of the U-shaped notch 4a. In addition, the number of parts increases, but screwing may be used instead.
Further, in the above description, the pillars 3e constituting the seat surface 3b for holding the printed circuit board 4 are provided at the four corners of the case 3, but a larger number may be provided.

  As shown in FIG. 2, the side wall of the case is soldered by providing a pillar 3 e and a seat surface 3 b for holding the printed circuit board 4 at a position higher than the divided surface 3 d of the case 3, that is, a position close to the cover 2 side. A sufficient distance from the position to be placed (L in FIG. 2) allows the distance Y between the terminal 5 of the mounted component disposed on the printed circuit board 4 and the end surface of the printed circuit board 4 to be reduced. For this reason, the solder sneak avoidance region 4b shown in FIG. 4 can be reduced, thereby reducing the size of the printed board 4, the case 3, and the cover 2, and printing without removing the printed board 4 from the case 3. It is possible to visually check the state of mounted components and solder on both the front and back surfaces of the substrate 4.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. 6 is an exploded perspective view showing a housing structure of an in-vehicle electronic device according to Embodiment 2 of the present invention, and FIG. 7 is a side sectional view of the case portion.
In the second embodiment, as shown in FIG. 6, the case 9 is integrally formed with a connector housing portion 9 b that constitutes a jacket of a connector that performs electrical connection to the printed circuit board 4. The case 9 and the connector housing portion 9b are integrally molded with a resin by a mold apparatus including a plurality of mold parts. The cover 8 that covers the case 9 is provided with a fitting hook 8a.
A large number of connecting pins 11 are arranged in the connector housing portion 9b in a state of being bent vertically toward the opening of the case 9 by being press-fitted into the connector housing portion 9b or integrally formed with the connector housing portion 9b. Configure.
The dividing surface 9d of the case 9 (corresponding to the dividing surface 3d of the case 3 in the first embodiment) is on the bottom side of the portion 9e to be extracted from the inside of the case of the mold portion for forming the partial inner surface of the connector housing portion 9b. Set to. That is, a portion 9e of the mold portion for forming a partial inner surface of the connector housing portion 9b is set on the cover 8 side above the dividing surface 9d of the case 9.
Further, the connector housing portion 9b is provided with a projection portion 9f used for a lock mechanism or the like, and it is necessary to mold the complicated shape with a mold. However, the mold portion for molding the projection portion 9f of the connector housing portion 9b is molded. The slide-out direction S1 after the operation is opposite to the slide-out direction S2 from the inside of the case of the mold part 12 after forming a part of the inner surface of the connector housing portion 9b, so that difficult molding work can be smoothly performed. Can proceed.
Then, the printed circuit board 10 is installed in the same manner as in the first embodiment, and the terminals 5 of the mounted components are connected by partial jet soldering, and at the same time, the connection pins 11 and the printed circuit board 10 are electrically connected by solder connection. Since the other structure of the housing 1 is the same as that of the first embodiment, detailed description thereof is omitted.

  In Embodiment 2 configured as described above, even if the connector has a complicated connector shape such as a lock mechanism that slides from the inside, such as a portion 9e as shown in FIG. The slide structure can be configured without using it, and the number of parts can be reduced and the quality can be improved at the same time.

  As described above, according to the present invention, a column having a seating surface for holding a printed circuit board is provided, and the seating surface is combined with a housing at a position higher than the dividing surface of the case, that is, the printed circuit board. The position near the housing side is set, and the printed circuit board is held by a rib protruding from the seating surface, so that a space for partial jet solder can be secured, and the printed circuit board and the housing can be downsized. As a result, the cost can be reduced and a structure in which the slide is pulled out from the inside of the case when the case and the complicated connector are integrally formed can be configured, and the connector connection pin and the printed circuit board can be connected by soldering. Quality can be improved by being able to visually check the state of both front and back surfaces.

  Note that the present invention can be partly or wholly combined with each other within the scope of the invention, or can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Electronic device housing | casing, 2 cover, 2a fitting hook, 2x plate-shaped cover part, 2y peripheral wall part, 3 case, 3a fitting rib, 3b printed circuit board holding seat surface, 3c printed circuit board press-fitting rib, 3d case and cover division | segmentation Surface, 3e pillar, 3x plate-like bottom part, 3y peripheral wall part, 4 printed circuit board, 4a U-shaped notch, 4b solder sneak avoidance area, 5 mounting component terminal, 8 cover, 8a fitting hook, 9 case (connector) Housing part integrated molding), 9a Fitting rib, 9b Connector housing part, 9c Pillar, 9d Case dividing surface, 9e Inner part of connector housing, 9f Projection part, 10 Printed circuit board, 11 Connector connection pin, 12 Mold part, 19 Partial jet solder, 20 Solder flow, L Case side wall / distance between boards, Y Distance between terminals of mounting parts and board end face.

The present invention includes a housing that incorporates a printed circuit board to have a terminal of the electronic component which is mounted with electronic component mounting said printed circuit board, wherein the housing, on the side housing for holding the printed circuit board together they are constituted by the cover of the housing parts to be combined with the case of the component to the side of the housing part which holds the printed circuit board to cover the case, the case and the square tube-shaped peripheral wall portion and cover Each of the peripheral wall portions of the case and the cover constituting the casing includes a fitting portion that fits to each other , and the case and the cover are separated from each other by a plane parallel to the printed circuit board surface. capable be those that are configured, wherein the case seating surface pixel for holding the printed circuit board are formed integrally with projecting peripheral wall portion in the extending direction of the peripheral wall portion from said peripheral wall A plurality of pillars Re provided respectively, and characterized in that so as to dispose at a distance of the printed circuit board from the peripheral wall of the case by holding the printed circuit board by the seating surface of said post To do.

According to the present invention, the printed circuit board is held by the seating surfaces provided on the plurality of pillars that protrude from the peripheral wall portion of the case, and the printed circuit board is disposed separately from the peripheral wall portion of the case. Accordingly, it is possible to secure a portion jet solder space for soldering connection work of the printed circuit board terminals, a printed circuit board and the housing it is possible to miniaturize, it is possible to reduce the cost, printing Since the state of both the front and back surfaces of the printed circuit board can be visually confirmed after the solder connection on the circuit board is performed , the quality can be improved.

Claims (7)

  A printed circuit board on which an electronic component is mounted; and a housing containing the printed circuit board, wherein the housing is a plane parallel to the printed circuit board surface, and the housing component on the side for holding the printed circuit board and the printed circuit board The housing part is combined with a housing part to be combined with the housing part, and the housing part on the side that holds the printed circuit board of the two housing parts holds the printed circuit board. It is provided with a pillar having a seating surface, and the seating surface is set at a position closer to the housing component side combined with the housing component on the side holding the printed circuit board than the division surface of the housing. Electronic equipment housing structure.   It has a printed circuit board on which electronic components are mounted and a housing containing the printed circuit board, and the housing is divided into a plane parallel to the printed circuit board surface and a case and a cover that covers the case, Each of the case and the cover includes a fitting portion that fits to each other, and an inner wall of the case has a column having a seat surface that holds the printed circuit board, and the seat surface of the column is a division of the housing An in-vehicle electronic device casing structure characterized by being set at a position higher than the surface.   The in-vehicle device according to claim 1, wherein the printed circuit board is fixed and held by press-fitting an engagement portion on the printed circuit board into a rib protruding from the seating surface. Housing structure for electronic equipment.   2. The printed circuit board according to claim 1, wherein an outer size in the vertical or horizontal direction is the same as or larger than an inner dimension of a housing part on a side of holding the printed circuit board among the two housing parts. The case structure of the vehicle-mounted electronic device in any one of Claim 3.   The housing component on the side that holds the printed circuit board is integrally formed by a connector housing portion and a mold that form an outer cover for the printed circuit board, and the housing is integrated with the connector housing portion. The housing structure of the in-vehicle electronic device according to any one of claims 1 to 4.   A second mold part having a slide-out direction opposite to the first mold part forming the projection of the connector housing, the inner side of the connector housing part being a housing part on the side holding the printed circuit board The case structure of the vehicle-mounted electronic device according to claim 5, wherein the case structure is formed by:   The part for removing the mold part for forming the connector housing portion from the inside of the casing on the side holding the printed board is the casing on the side holding the printed board with respect to the divided surface of the two casing parts. The case structure of the vehicle-mounted electronic device according to claim 5, wherein the case structure is located on a case component side combined with the component.

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