JPH0518065U - Printed circuit board mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding a structure for mounting electronic components on a printed circuit board in a housing, in an electronic device in which a large electronic component such as a capacitor is mounted on the printed circuit board in the housing. The object is to increase the mounting density of the board and downsize the entire device. In an apparatus in which a printed circuit board P is fixed in a housing C and electronic components are mounted on the printed circuit board P, a holder H separated from the printed circuit board surface by a distance G is provided from a side wall of the housing C. Extend on the printed circuit board P in a beam shape,
The large component 2 is inserted and fixed in the holder H, the lead wire 5 of the large component 2 is connected to the printed circuit board P, and the space between the holder H and the printed circuit board P is used to print the printed circuit board P. The small component 1a is mounted on the top.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a structure for mounting electronic components on a printed circuit board in a housing.

[0002]

[Prior Art]

 FIG. 6 is a sectional view showing a conventional printed circuit board mounting structure. In the case of a device that receives a shock or a vibration such as an on-vehicle electronic device, the printed circuit board P is housed in a robust casing C having a casing shape. Various electronic components 1 are mounted on the printed circuit board P. In the case of a large component such as a large-capacity capacitor 2 or the like, in order to increase the mounting density of the printed circuit board P, the capacitor 2 is set up. Although it is advantageous to mount it in a closed state, there is a risk that it may fall down or the lead wire connecting portion to the printed circuit board P may be broken when it receives an impact.

Therefore, conventionally, as shown in FIGS. 7 (a) and 7 (b), the mounting density on the printed circuit board P is sacrificed, and the capacitor 2 is laid on the printed circuit board P. Adhesion is performed, or as shown in FIG. 7 (c), a semi-circular press fitting 4 is used to fix the printed circuit board P to the printed circuit board P, and the lead wire is connected to the printed circuit board P.

[0004]

[Problems to be solved by the device]

 However, in such a mounting structure, when a large component such as the capacitor 2 is mounted, the mechanical stability is improved, but the area occupied by the large component 2 on the printed circuit board P becomes large. Therefore, there is a problem in that the mounting density is reduced and the entire device becomes large, and it is not possible to meet the demand for miniaturization of electronic devices. Further, as shown in FIG. 6, even when the capacitor 2 is mounted upright so that the occupied area is small, the occupied area by the capacitor 2 is large, and a reduction in mounting density cannot be avoided. Moreover, when the capacitor 2 is mounted upright, the height of the capacitor 2 is higher than that of other components, so that the size of the housing has to be increased, which is contrary to the miniaturization.

The technical problem of the present invention focuses on such a problem, and in an electronic device in which a large-sized electronic component such as a capacitor is mounted on a printed circuit board in a housing, the mounting of the printed circuit board is performed. It is to increase the density and downsize the entire device.

[0006]

[Means for Solving the Problems]

 FIG. 1 is a sectional view for explaining the basic principle of a printed circuit board mounting structure according to the present invention, in which a printed circuit board P is housed and fixed in a housing C. Reference numeral H denotes a holder for a large component 2 such as a capacitor, which extends from the side wall of the casing C onto the printed circuit board P by a length L in a beam shape. A gap G is provided between the holder H and the printed circuit board P so that the small component 1a can be mounted on the printed circuit board P. By utilizing this space, the small component 1a is mounted on the printed circuit board P. ing. The large component 2 is fixed to the holder H, and the lead wire 5 is connected to the printed circuit board P.

In the second aspect, the holder H has a large component storage portion 6 that is long in the direction parallel to the surface of the printed circuit board P, and the storage portion 6 can hold the large component 2 by elastic pressure. So it has elasticity. It should be noted that the large component refers to a component in which the area occupied by the printed circuit board P when mounted directly on the printed circuit board P is significantly larger than other components.

[0008]

[Action]

 As described in claim 1, the large component 2 is held by the holder H, but since the holder H is fixed to the side wall of the housing C in a beam shape, the large component 2 is held by the holder H. Since it is fixed to the casing C, it has excellent stability and can fully withstand impact.

Further, since the holder H for holding the large-sized component 2 is separated from the component mounting surface of the printed circuit board P by the distance G, the printed circuit board surface below the holder H is a small small component 1a with a short height. Can be used to implement. That is, since the large-sized component 2 and the holder H are mounted in the housing C by utilizing the space above the printed-circuit board P, the printed-circuit board surface is consumed for mounting the large-sized component 2 and the holder H. The lead wire 5 is only soldered.

According to the second aspect of the present invention, the holder H is formed to have the large-sized component storage portion 6 which is long in the direction parallel to the surface of the printed circuit board P, so that the large-sized component is laid in the space on the printed circuit board P. 2 can be mounted, so even if a long-shaped component such as a large capacitor is used, it is possible to effectively prevent the device from becoming expensive and downsize it compared to the conventional structure in which it is mounted vertically. . Further, since the storage portion 6 has elasticity so that the large component 2 can be elastically held, the work of inserting and fixing the large component 2 into the holder H becomes easy.

[0011]

【Example】

 Next, practical examples of how the printed circuit board mounting structure according to the present invention is embodied will be described. FIG. 2 is a perspective view showing the whole embodiment of the printed circuit board mounting structure according to the present invention, in a state where the upper lid is opened. A printed circuit board P is fixed to the bottom of a box-like case C made of aluminum or the like, one end of a holder H is fixed to the side wall of the case C, and extends in a cantilever shape on the printed circuit board P. There is. A connector 8 is built inside the opening 7 opened on the other side wall of the casing C.

FIG. 3 is a plan view (a), a front view (b) and a sectional view (c) taken along the line cc in FIG. As shown in (a), one end of a holder H having a length L is engaged and held by the side wall of the housing C by the brim portions 15 and 16. Further, as shown in (b), a screw 10 is attached from the outside. It is fixed at. Further, as shown in (c), a gap G is provided between the holder H and the printed board P, and in the space of this gap G, the small component 1a is placed on the printed board P as shown in FIG. Will be implemented. In addition, 11 is a lower lid and 12 is an upper lid.

4A and 4B are perspective views of the beam-shaped holder H. FIG. 4A is a perspective view seen from a mounting portion side to the housing, and FIG. 4B is a perspective view seen from a lead wire connecting portion side. .. In this holder H, two cylindrical holes 61 and 62 are formed in a block made of synthetic resin, and slits 13 and 14 parallel to the cylindrical holes 61 and 62 are formed on both sides, whereby upper and lower arms a, The space between b can be opened and closed elastically. At one end of the holder H, brim portions 15 and 16 for attachment to the side wall of the housing are integrally formed.

On the other hand, holes 17 and 18 into which the brim portions 15 and 16 are fitted are formed in the side wall of the housing C. The brim portion 15 is fitted into the hole 17 and the brim portion 16 is fitted into the hole 18, respectively. As a result, the holder H is engaged with and held by the side wall of the housing C in a cantilever manner. Further, the screws are fixed by screwing the screws 21 into the screw holes 19 formed on the flange portions 15 and 16 of the holder H from the holes 20 on the side wall of the housing.

The inner diameter d of the cylindrical holes 61 and 62 of the holder H is slightly smaller than the outer diameter D of the large-sized component 2 to be mounted. Therefore, if large cylindrical parts 2 and 2 are inserted into the cylindrical holes 61 and 62 from the opposite side of the brim parts 15 and 16, that is, in the direction of arrow a ₁ shown in FIG. The mold parts 2 and 2 are held in the two cylindrical holes 61 and 62 of the holder H by the elastic force between the arms a and b.

As shown in FIG. 4 (b), the lead wires 5 of the large-sized components 2 and 2 project to the opposite side of the brim portions 15 and 16, so that the lead wires 5 are connected to the terminals 22 on the printed board P. Electrical connection is made by soldering or by inserting into a through hole of the printed circuit board P and soldering.

The holder H may have a ω-shaped cross section. When the shape of the large-sized component 2 is not cylindrical, the shape of the component storage portion of the holder corresponds to the shape of the large-sized component 2 that is stored and held.

2 to 4, the holder H has a cantilever structure, while FIG. 5 has a structure in which both ends are fixed. That is, a holder H having a C-shaped cross section as shown in FIG. It is fixed between the side walls on both sides. The fixing means for the holder H and the side walls on both sides may have the same structure as in FIG. In this embodiment, the cylindrical hole 63 of the holder H has a C-shaped cross section and is open on the upper side. And arrange so that the lead wires 5 face each other.

The lead wire 5 of the large-sized component 2 passes through the hole formed in the holder H and is connected to the circuit of the printed circuit board P. Further, the upper lid 12 is covered with the spacer 24 inserted between the large parts 2 and 2 so that the large parts 2 and 2 cannot move. In addition, the opening 23 of the holder H can be turned sideways.

[0020]

[Effect of the device]

 As described above, according to the present invention, the holder H having the storage portion for the large-sized component 2 is in the form of a beam from the side wall of the housing onto the printed circuit board P in a state where the space G is provided between the holder H and the printed circuit board P. It is extended, and a large part is inserted and fixed in the holder, and the lead wire of the large part is connected to a printed circuit board. As a result, the printed circuit board surface below the holder H is not used for mounting large components or the holder H at all, so that small short components can be mounted on this printed circuit board surface. Mounting efficiency is improved, high-density mounting is possible, and device miniaturization is realized. Moreover, since the large component 2 is fixed to the housing C via the holder H, the large component 2 has good stability and can sufficiently withstand impact.

When a large component that is long in the direction parallel to the surface of the printed circuit board P is stored as in claim 2, the effect of downsizing is particularly great, and the component storage portion 6 of the holder H is replaced by the large component 2. By making the shape elastic so that it can be elastically held, the mounting work of the large component 2 becomes easy.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating a basic principle of a printed circuit board mounting structure according to the present invention.

FIG. 2 is a perspective view showing the whole of an embodiment of a printed circuit board mounting structure according to the present invention.

3A and 3B are diagrams showing the details of the apparatus of the above embodiment, FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a sectional view taken along line cc in FIG.

FIG. 4 is a perspective view of a holder.

5 is another embodiment of the present invention, (a) sectional view, (b)
FIG. 7B is a sectional view taken along line bb in FIG.

FIG. 6 is a cross-sectional view showing a conventional printed circuit board mounting structure.

FIG. 7 is a diagram showing a conventional mounting structure for large-sized components.

[Explanation of symbols]

C Housing P Printed circuit board 1 Electronic component 1a Small component (small electronic component) 2 Large component (large electronic component such as large-capacity capacitor) 3 Adhesive 4 Holding metal 5 Lead wire of large component H Holder 6 Storage area for large parts 61,62,63 Cylindrical hole G Distance between printed board surface and holder 7 Opening 8 Connector 10 Screw 11 Lower lid 12 Upper lid 13,14 Slit a, b Arm 15,16 Collar 17, 18 holes 19 screw holes 20 holes 21 screws 22 terminals 23 openings 24 spacers

Claims (2)

[Scope of utility model registration request] 1. An apparatus comprising a printed circuit board (P) fixed in a housing (C), and electronic components mounted on the printed circuit board (P), separated from the printed circuit board surface by a distance (G). Holder (H)
Is extended from the side wall of the housing (C) onto the printed circuit board (P) in a beam shape, and the large part (2) is fixed to the holder (H).
By connecting the lead wire (5) of (2) to the printed circuit board (P) and utilizing the space between the holder (H) and the printed circuit board (P), small parts can be placed on the printed circuit board (P). A printed circuit board mounting structure characterized in that (1a) is mounted. 2. The holder (H) has a large component storage section (6) which is long in a direction parallel to the surface of the printed circuit board (P),
Moreover, the printed circuit board mounting structure according to claim 1, wherein the storage section (6) has elasticity so as to elastically retain the large-sized component (2).