JPH0922761A - Printed board installation/connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation/connection structure for a printed board in which a miniaturized printed board of a small terminal pitch can be detachably installed in a housing even for the printed board provided with a number of terminals. SOLUTION: An aperture recessed part 2a is formed on a housing 2, and a printed board 1 having a circuit board mounted on the board is fitted into the aperture recessed part 2a to be installed. Plural electrode parterres 1d are formed on side surfaces of the printed board 1, and resilient electrode terminals 3 corresponded to the electrode patterns 1a are installed on side surfaces in the aperture recessed part 2a in the housing 2 in such a way that terminal parts 3a are protruded. The resilient electrode terminals 3 are formed by bending metal wire having spring resiliency, and the terminal parts 3a of the resilient electrode terminals 3 are fitted into the aperture recessed part 2a of the printed board 1 to resiliently get in contact with the electrode pattern 1d to be connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board in which a circuit board such as an integrated circuit is mounted on a circuit board by press-fitting it into an opening recess formed in a housing of electronic equipment or the like. Related to the mounting and connection structure.

[0002]

2. Description of the Related Art Conventionally, when a printed circuit board is mounted on a part of a housing of an electronic device, its electric connection is usually made by a permanent connection method in which a terminal portion is welded or wire bonded to an electrode of the printed circuit board. .

[0003]

When the printed circuit board is mounted on the housing by such a permanent connection method, it becomes difficult to replace the printed circuit board, and in the connection step during manufacturing, a dedicated welding machine or wire bonder is used. There was a problem that a dedicated machine such as

On the other hand, as a technique for detachably mounting an IC package and an IC module on a printed circuit board, conventionally, an opening recess is formed on the printed board, and an elastic electrode terminal is attached to the inside of the opening recess to attach an IC package or the like. Japanese Patent Application Laid-Open No. 52-16
No. 663 and Japanese Utility Model Laid-Open No. 7-10973.

Therefore, in order to replaceably mount the printed circuit board in the housing, a method is considered in which an opening recess is provided on the housing, the elastic electrode terminals are mounted in the opening recess, and the printed board is press-fitted into the recess. However, the elastic electrode terminals that have been conventionally used for press-fitting and mounting of integrated circuits, etc. have been formed by pressing a metal plate. Since it becomes large, the pitch between terminals inevitably increases, and there is a problem that the elastic electrode terminals hinder the miniaturization of the printed circuit board.

The present invention has been made in view of the above points. Even in a printed circuit board having a large number of terminals, a printed circuit board having a small terminal pitch can be attached to and detached from the housing. An object is to provide a mounting / connecting structure for a printed circuit board that can be mounted.

[0007]

In order to achieve the above object, a printed board mounting / connecting structure according to the present invention is a printed board in which an opening recess is formed in a housing and a circuit element is mounted on the board. In the mounting / connecting structure of the printed circuit board, which is press-fitted into the opening concave part and mounted, a plurality of electrode patterns are formed on the side surface of the printed circuit board, and elastic electrode terminals corresponding to the electrode patterns are provided on the side surface inside the opening concave part of the housing The elastic electrode terminal is formed by bending a metal wire having spring elasticity, and the terminal portion of the elastic electrode terminal is elastically contacted and connected to the electrode pattern by press fitting into the opening concave portion of the printed circuit board. It is characterized by being done.

Here, the electrode pattern may be formed in a groove shape as a side surface obtained by vertically cutting a conductive pattern formed by a through hole on the printed board.

The printed circuit board having such a structure is press-fitted into the opening concave portion of the housing so as to be inserted from above. By this press-fitting, each electrode pattern on the side surface of the printed circuit board comes into contact with the terminal portion of the elastic electrode terminal located on the side surface inside the opening concave portion, and the terminal portion is elastically contacted with the electrode pattern by the spring force of the elastic electrode terminal. , Electrical connection is secured. Further, since the printed circuit board is clamped by the spring force of each elastic electrode terminal, it does not easily come off.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a printed circuit board 1 attached to a housing 2 of an electronic device. The printed circuit board 1 is made of synthetic resin or ceramics.
A conductive pattern 1b is formed on a by thick film printing, and a circuit element 1c such as an integrated circuit is mounted on the conductive pattern 1b.

As shown in FIG. 2, the conductive pattern 1b is
It extends to the side surface of the substrate 1a, and the side surface portion forms the electrode pattern 1d. When the printed circuit board 1 is press-fitted into the electrode pattern 1d, elastic electrode terminals are elastically pressed against each other.

An opening concave portion 2a having a shape corresponding to the shape of the printed circuit board 1 is formed at a predetermined portion of the housing 2,
Around the opening recess 2a, a rectangular hole 2b is formed at a position corresponding to the electrode pattern 1d on the printed circuit board side, and the rectangular hole 2b communicates with the opening recess 2a inside. Elastic electrode terminals 3 formed by bending a metal wire are provided in these rectangular holes 2b.
Is mounted so as to be inserted from above, and the lead member 4 connected to the end of the elastic electrode terminal 3 is embedded in the housing 2.

The elastic electrode terminal 3 is formed by bending a metal wire having a spring elasticity (a wire having a circular cross section or a rectangular cross section) such as phosphor bronze or beryllium copper as shown in FIG. The terminal portion 3a is bent upward and a connecting portion 3b to which the lead member 4 is connected is provided at the end.

The elastic electrode terminal 3 is mounted so as to be inserted into the rectangular hole 2b provided in the housing 2 from above, and the terminal portion 3a thereof is located on the side surface inside the opening concave portion 2a and the connecting portion 3 thereof.
b projects upward from the rectangular hole 2b. And the connection part 3
b and the tip of the lead member 4 are connected by soldering, welding, or caulking.

The printed circuit board 1 is pressed into the opening recess 2a of the housing 2 so as to be inserted from above. By this press-fitting, each electrode pattern 1d on the side surface of the printed board 1
Respectively come into contact with the terminal portions 3a of the elastic electrode terminals 3 located on the side surfaces inside the opening recessed portions 2a, and the spring force of the elastic electrode terminals 3 causes the terminal portions 3a to elastically contact the electrode pattern 1d, ensuring electrical connection. To be done. Further, since the printed circuit board 1 is clamped by the spring force of each elastic electrode terminal 3, it does not easily come off.

The electrode pattern provided on the side surface of the printed board 1 may be formed in a groove shape having a semicircular cross section, as shown in FIG. This groove-shaped electrode pattern 11d is
As shown in FIG. 5, the conductive pattern 11b is formed on the substrate 11a.
At the time of forming the substrate, a conductive pattern is also formed in the holes of the substrate 11a by the through hole method, and then the substrate 11a is broken at a cutting line L passing through the center of the holes to form a groove shape as shown in FIG. The electrode pattern 11d can be formed.

In the groove-shaped electrode pattern 11d having such a semicircular cross section, the elastic electrode terminal 3 of the metal wire having the circular cross section is formed.
Can be favorably held by its concave surface, and electrical connection can be favorably maintained without causing a positional deviation or the like. When a metal wire having a rectangular cross section is used for the elastic electrode terminal 3, a groove-shaped electrode pattern 21d having a rectangular cross section may be formed on the substrate 21a as shown in FIG.

The manufacturing method shown in FIG. 5 will be described. The substrate 1
A through hole H is formed in 1a, a cutting line L passing through the center of the through hole H is formed, and notches 11e are formed on both sides.
Further, the shoulder portion 11f is cut out, and a chocolate break is made at the cutting line L. As a result, a large number of required substrates 11a can be obtained from one plate material.

The cut surface may be roughened by breaking the substrate with chocolate, but even if the cut surface is rough, the shoulder portion 11f should be fitted to the housing 2.
By doing so, the assembling error between the housing 2 and the substrate 11a can be reduced, and the pressing force of the terminal portion 3a of the elastic electrode terminal 3 pressing the electrode pattern 11d formed on the through hole surface does not vary.

In addition to the shape shown in FIG. 3, the elastic electrode terminal made of a metal wire has an elastic electrode terminal 13 whose tip is bent inward as shown in FIGS. 7A, 7B and 7C, and an intermediate position of the terminal portion is expanded. The elastic electrode terminal 23 may be a bent shape so as to be extended, or the elastic electrode terminal 33 may be a shape in which the tip end is bent inward.

Thus, the electrode pattern is formed by the conductive pattern on the side surface of the printed circuit board, and the elastic electrode terminal in which the metal wire is bent is provided corresponding to the electrode pattern at the side surface position in the opening recess formed on the housing. By press-fitting the printed circuit board into the opening recesses, each electrode pattern is brought into elastic contact with each elastic electrode terminal, so that the printed circuit board can be removably mounted and good electrical connection can be made to the printed circuit board. .

Further, since the elastic electrode terminal of the metal wire is used, the width of the terminal is very narrow, and the diameter is, for example, 0.5 mm.
When using elastic electrode terminals of ˜1.0 mm, the terminal pitch can be doubled to 1.0 mm to 2.0 mm, and the printed circuit board can be made very small. In addition, the elastic electrode terminal of the metal wire can be manufactured at a lower cost than the case of molding by press molding or the like, and the manufacturing cost can be reduced.

[0024]

As described above, according to the printed circuit board mounting / connecting structure of the present invention, a plurality of electrode patterns are formed on the side surface of the printed circuit board, and the terminal portions of the elastic electrode terminals are formed in the electrode patterns. Since the elastic contact is made by the spring force, the electric connection can be surely held and the printed circuit board can be prevented from easily coming off the housing.

Further, since the elastic electrode terminal of the metal wire is used, the width of the terminal becomes very narrow as compared with the terminal obtained by pressing the metal plate, and the pitch between terminals can be made minute,
As a result, the printed circuit board can be made extremely small. Also, since the terminals can be manufactured at low cost,
The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a printed circuit board attached to a housing.

FIG. 2 is a partial perspective view of a printed circuit board.

FIG. 3 is a front view of an elastic electrode terminal.

FIG. 4 is a perspective view of a main part of another example of a printed circuit board.

FIG. 5 is a plan view of the printed circuit board during manufacturing.

FIG. 6 is a partial plan view of another example of a printed circuit board.

FIG. 7 is a front view of an elastic electrode terminal of another example.

[Explanation of symbols]

 1-printed board, 1a-board, 1b-conductive pattern, 1c-circuit element, 1d-electrode pattern, 2-housing, 2a-opening recess, 3-elastic electrode terminal.

Claims (2)

[Claims] 1. A mounting / connecting structure of a printed circuit board, wherein a printed circuit board having an opening concave portion formed on a housing and circuit elements mounted on the substrate is press-fitted into the opening concave portion to be mounted. A plurality of electrode patterns are formed on the side surface, and elastic electrode terminals corresponding to the electrode patterns are mounted on the side surface in the opening concave portion of the housing with the terminal portion protruding, and the elastic electrode terminal is formed of a metal wire having spring elasticity. Mounting of a printed circuit board, which is formed by bending and is elastically contacted and connected to the electrode pattern by press-fitting the terminal portion of the elastic electrode terminal into the opening concave portion of the printed circuit board.
Connection structure. 2. The mounting / connecting structure for a printed circuit board according to claim 1, wherein the electrode pattern is formed in a groove shape as a side surface obtained by vertically cutting a conductive pattern formed by a through hole in the printed circuit board.