JPH1126978A - Electromagnetic shield connecting device and connecting terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To multidimensionally meet the requirement for thinning, miniaturization, and cost reduction of an electronic equipment such as a portable telephone. SOLUTION: An electromagnetic shield case 1 is provided with a partition 2, and a connecting terminal 30 is formed by separately arranging a first support part 32 and a second support part 33 substantially having U-shaped cross- sections so that the U-shaped cross-sections can face each other. In this case, an elastic spring piece 1 (44) and an elastic spring piece 2 (45) which face each other so that the cross-section can be substantially shaped like a U shape are provided at an intermediate part between a communicating piece 1 (38) and a communicating piece 2 (39) connecting those supporting parts. When the partition 2 is interposed between the elastic spring piece 1 (44) and the elastic spring piece 2 (45), the partition 2 is pressed to contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield connecting device for obtaining a shielding effect against the adverse effects of electromagnetic wave radiation and electromagnetic interference generated in small electronic devices such as portable telephones and information terminals.

[0002]

2. Description of the Related Art In an electronic device, electromagnetic waves generated from an internal electronic circuit may have an adverse effect on the outside, and external electromagnetic interference to the internal electronic circuit may affect the function of the electronic circuit. A phenomenon such as a malfunction may be caused. Among these countermeasures, electronic circuits as a source of electromagnetic waves and electronic circuits that need to prevent external electromagnetic interference, in order to electromagnetically cut off, a technique of surrounding the periphery with a conductive material, that is, It is considered effective to interpose an electromagnetic shield container. When the electromagnetic shielding container is mounted on a small electronic device such as a mobile phone, the electromagnetic shielding container is electrically connected to a ground wiring pattern of a printed wiring board disposed inside, and also has an electromagnetic shielding effect of a ground wiring layer of the printed wiring board. Often used together.

Conventionally, semi-permanent connection by soldering or fixed connection by screwing have been used as a technique for mounting an electromagnetic shield container on a printed wiring board and electrically connecting them. Is required, and application to small electronic devices is considered to be difficult.
Further, it is not easy to automate and labor-saving the mounting work, and it is also difficult to reduce the manufacturing cost. In addition, the maintenance of the electronic device makes it difficult to remove the electromagnetic shield container, which also hinders a reduction in maintenance cost.

[0004] As a method of connecting an electromagnetic shield container which realizes space saving and labor saving of attaching / detaching work, an elastic piece which can be pressed against a partition wall of the electromagnetic shield container and a reflow soldering on a ground wiring pattern of a printed wiring board can be performed. In recent years, a method using a connection terminal provided with a flat bottom piece has begun to be widely used. As an example of this type of connection terminal, a facing cantilever spring type shown in FIGS. 5 and 6 is known. The connection terminal A (10) has a terminal portion (14) in which a plurality of pairs of opposing cantilever springs (12) extending from a common base portion A (11) approach each other at a contact portion A (13) and further extend away from each other. )
When the partition (2) of the electromagnetic shield container (1) is interposed between the opposed cantilever springs (12), the partition (2) is brought into pressure contact with the contact portion A (13). . This type is characterized by the stable pressing force of the opposed cantilever spring and the ease of attaching and detaching the electromagnetic shield container.
Since the spring portion from (11) to the contact portion A (13) has a linear flat plate shape, it is necessary to secure this spring length sufficiently to take advantage of the above-mentioned features, and for this reason, the terminal portion (14)
If it is desired to reduce the total height including that, it is necessary to consider the limit. The height requirement of this type has hindered the provision of an electromagnetic shield connection device that meets the demand for electronic devices that are increasingly required to be light and thin.

As another example of a conventional connection terminal of this type, a holding type shown in FIGS. 7 and 8 is also known.
The connection terminal B (20) extends from the common base B (21) and is folded back into a “C” -shaped cross section.
(22), and furthermore, a contact portion B (23) at the tip thereof is provided, and the electromagnetic shield container (1) and the printed wiring board (4) move the elastic spring B (22) toward the common base B (21). The partition wall end surface (6) is in pressure contact with the contact portion B (23) in a state where it is pressed so as to be displaced. This type is characterized in that it is low in height and easy to automate mounting on a printed wiring board (4) using a common base B (21), but in a state of connection with the electromagnetic shield container (1). The connection terminal B (20) itself does not have a function of holding the electromagnetic shield container, and in order to maintain a stable connection, it is necessary to provide another pressing mechanism such as a screw. This complicates the assembly structure of the electronic device and hinders reduction in design and manufacturing costs.

Further, the connection terminal A (10) and the connection terminal B (20) are both planar common bases A (11),
The common base B (21) extends in the longitudinal direction,
When it is necessary to extend the circuit pattern (6) outside the outer periphery of the electromagnetic shield container, the mounting exclusive area of each connection terminal is a wiring prohibited area to prevent a short circuit with the wiring pattern (5). For this reason, the printed wiring board (4) may be provided with a multilayer structure, which may increase the thickness of the electronic device and increase the cost.

[0007] As described above as a conventional example, an electromagnetic shield connection device using a conventional connection terminal is capable of responding to the demands for thinning, downsizing and cost reduction of electronic equipment using the same. Instead, the present invention aims to respond to this.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a connection terminal used in a conventional electromagnetic shield connection device in which the thinning, miniaturization, and reduction in design and manufacturing costs of electronic equipment could not be realized in a multidimensional manner. On the other hand, (a) A support having a “U” -shaped cross section is arranged in a bridge girder shape. (B) The pair of elastic spring pieces are arranged between the support portions so as to have an inverted “C” -shaped cross section. (C) The connection terminals of the above-described basic structure are arranged in series in the longitudinal direction, with the plate-shaped fixing portion serving as a common connecting portion. The connection terminal of the present invention having the above-described main configuration increases the area where circuit wiring can be wired by dispersing the support portion, and can securely hold the electromagnetic shield container while having a low-profile structure. The height of the device has been reduced, the assembly structure has been simplified, and the simplicity of reflow soldering and the labor saving of attaching / detaching the electromagnetic shield container, which the conventional connection terminal has, have not been lost.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is an exploded perspective view showing one embodiment of the electromagnetic shield connection device according to the present invention, FIG. 2 is a perspective view showing one embodiment of connection terminals constituting the electromagnetic shield connection device of FIG. 1, and FIG. 2 is a partial cross-sectional view showing a mounting state of the connection terminal of FIG. 2, and FIG. 4 is a perspective view showing another embodiment having the connection terminal of FIG. 2 as a basic structure.

1 and 3, an electromagnetic shield connection device according to the present invention comprises an electromagnetic shield container (1) surrounding an electronic circuit (3), a printed wiring board (4) having a wiring pattern (5), and a substantially " It is composed of a support portion having a U "-shaped cross section and a connection terminal (30) having an elastic spring piece.

The electromagnetic shield container (1) is made of a metal plate or a plastic having a conductive surface treatment, and is arranged so that a flat partition wall (2) surrounds an electronic circuit (3) requiring shielding. In a small electronic device such as a mobile phone, it may be formed integrally with an outer case. The printed wiring board (4) is arranged in accordance with the arrangement of the connection terminals (30) to be fitted with the partition walls (2), and the wiring pattern (5) connecting the mounting locations, etc., and the mounting location of the electronic circuit, etc., as necessary. A circuit pattern (6) to be connected is provided.

In FIG. 2, the connection terminal (30) is provided with a first support portion (3) having a substantially "U" -shaped cross section and arranged in a bridge girder shape.
2) and a second support portion (33), and the bottom surface of this cross section is connected to a planar fixing portion (31) that is connected by soldering on the wiring pattern (5). The first support portion (32) includes a support piece 1 (34) and a support piece 2 (35) extending upwardly opposite to the bottom surface, and the distance between the support pieces 1 (34) is such that the partition wall (2) can be inserted. ing. Similarly, the second support portion (33) has the support pieces 3 (36) and the support pieces 4 in the above-described arrangement.
(37) is provided.

The connecting piece 1 extending between the support pieces 1 (34) and the support pieces 3 (36) from the respective side directions and connecting each other.
(38) is provided, and a connection piece 2 (39) is similarly provided between the support piece 2 (35) and the support piece 4 (37). A pair of resilient spring pieces 1 (44) and resilient spring pieces that extend downward and are inclined so that their lower ends approach each other are provided at the intermediate portions of the connecting pieces 1 (38) and 2 (39). 2 (45), the cross section of which forms a substantially inverted "C" -shaped cross-section, the closest spacing of which is smaller than the thickness of the partition (2). With this arrangement, the partition wall (2) is made of the elastic spring piece 1 (44) and the elastic spring piece 2 (4).
5), the respective elastic spring pieces are elastically displaced, and a pressing force is applied to the partition wall (2).

The pressing force necessary to obtain a stable connection with the partition wall (5), and the followability of the elastic spring to the increase and decrease of the thickness of the partition wall (5) and the displacement (allowable displacement of the spring that does not lead to permanent deformation) On the other hand, the effective length of the elastic spring portion has a great influence on the mechanical performance of the connection terminal (e.g., amount). In terms of material mechanics, if the applied pressure is constant, the longer the effective length of the elastic spring is, the greater the allowable displacement of the spring can be. In the conventional example shown in FIGS. 5 and 6, the effective length of the spring is from the common base A (11) to the contact part A (13).
Up to the length in the height direction. On the other hand, the connector (30) of the present invention includes the support piece 1 (34) and the support piece 3 (3).
6) Since the connecting piece 1 (38) and the elastic spring piece 1 (44) are non-linearly connected and arranged to perform one of the opposing spring functions, the connection terminal A ( 1
Compared with 0), the effective length of the spring can be increased without increasing the height, and the height can be reduced when the effective length of the spring is the same.

In FIG. 2, the connection terminal (30) of the present embodiment is shown.
Is the opening 2 (5) between the bottom 1 (42) and the bottom 2 (43).
5) shows an embodiment in which the bottom surfaces are not connected to each other. The connection terminal A according to the related art also has a connection piece at an upper portion and an elastic spring piece at an intermediate portion of the connection piece.
Although it is possible to connect the bottom surfaces to form a common base as in (10), in the case of this embodiment, even if the opening 2 (55) is provided, the basic performance such as the connection performance with the partition wall (5) is not improved. No hindrance occurs. The opening 2 (55) is an insulating area in space, and this area in the surface layer of the printed wiring board (4) can be used as a circuit wiring area, thereby increasing the degree of freedom in circuit design. In other words, even when the number of circuit wirings increases, the countermeasure by increasing the number of layers of the printed wiring board is reduced.

In FIG. 3, a fixed portion (31) of a connection terminal (30) is connected by soldering on a wiring pattern (5). The partition (2) inserted below the opening 1 (54) sandwiched between the connecting pieces 1 (38) and 2 (39) is formed by the elastic spring pieces 1 (44) and 2 (45). It is in pressure contact with the wall in the vertical direction, and does not generate a reaction force that floats upward. That is, the connection terminal (30) itself has a function of holding the electromagnetic shield container by itself.

The connection terminal in FIG. 4 is a twin-integrated form in which the above-mentioned connection terminals (30) are arranged in series in the longitudinal direction, and includes a first connection portion (48) and a second connection portion (4).
The basic structure of 9) is the same as that of the connection terminal (30).
The planar common fixing portion (47) connecting the bottom surface 3 (52) and the bottom surface 4 (53) has a lower surface as a soldering area, and this connection terminal is mounted on a printed wiring board by an automatic mounting machine. , Is also used as the suction surface of the suction nozzle. Compared with the connection terminal (30) as a single unit, the number of connection contact points with the partition (5) is doubled, and the number of steps of mounting work on the printed wiring board per the number of connection contact points can be reduced by almost half.

[0018]

As described above, in the prior art, it is difficult to reduce the height of the connection terminals themselves on the printed wiring board, the degree of freedom in circuit wiring of the printed wiring board is insufficient, and the electromagnetic shield container is held by itself. There is no one that can solve the problem of gender deficiency in multiple ways. ADVANTAGE OF THE INVENTION According to the above-mentioned solution means of the present invention, the electronic device can be made thinner and smaller by reducing the height of the connection terminal itself and the circuit wiring area of the printed wiring board. The function can also reduce the cost of designing and manufacturing electronic devices. Further, the twin-integrated connection terminal according to the second aspect of the present invention can increase the efficiency of mounting on the printed wiring board and further reduce the cost of the electronic device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an electromagnetic shield connection device according to the present invention.

FIG. 2 is a perspective view showing one embodiment of a connection terminal constituting the electromagnetic shield connection device of FIG. 1;

FIG. 3 is a partial cross-sectional view showing a mounting state of the connection terminal of FIG. 2;

FIG. 4 is a perspective view showing another embodiment having the connection terminal of FIG. 2 as a basic structure.

FIG. 5 is a perspective view showing one embodiment of a conventional connection terminal.

FIG. 6 is a partial cross-sectional view showing a mounting state of the connection terminal of FIG. 5;

FIG. 7 is a perspective view showing another embodiment of the conventional connection terminal.

FIG. 8 is a partial cross-sectional view showing a mounting state of the connection terminal of FIG. 7;

[Explanation of symbols]

 (1) Electromagnetic shield container (2) Partition wall (3) Electronic circuit (4) Printed wiring board (5) Wiring pattern (6) Circuit pattern (30) Connection terminal (31) Fixed part (32) First support part (33) ) Second support part (34) Support piece 1 (35) Support piece 2 (36) Support piece 3 (37) Support piece 4 (38) Connection piece 1 (39) Connection piece 2 (40) Intermediate part 1 (41) Intermediate part 2 (42) Bottom 1 (43) Bottom 2 (44) Elastic spring piece 1 (45) Elastic spring piece 2 (47) Common fixing part (48) First connection part (49) Second connection part (50) Third support (51) Fourth support (52) Bottom 3 (53) Bottom 4 (54) Opening 1 (55) Opening 2

Claims (2)

[Claims] 1. An electromagnetic shield container (1) at least partially surrounding an electronic circuit (3) and a printed wiring board (4) having a wiring pattern (5) are electrically connected via connection terminals (30). In the electromagnetic shield connection device, the electromagnetic shield container (1) includes a partition (2) having at least a portion of conductivity, and the connection terminal (30) has at least a portion on the wiring pattern (5). At least a part of the planar fixing portion (31) to be connected by soldering is a bottom surface 1 (42), and the support pieces 1 (34) and the support pieces 2 (35) extending from the bottom surface 1 (42) are opposed to each other. A first support portion (32) having a substantially "U" -shaped cross-section, a support piece 3 (36) and a support piece 4 (37) extending opposite to at least a partially planar bottom surface 2 (43). ) And the bottom surface 2 (4 ) And the support piece 3 (36) and the support piece 4
(37) and a second support portion spaced apart such that a substantially “U” -shaped cross section formed by the first support portion (32) faces a plane parallel to the substantially “U” -shaped cross section of the first support portion (32). (33)
A connecting piece 1 (38) connecting the supporting pieces 1 (34) and the supporting pieces 3 (36) arranged apart from each other; a supporting piece 2 (35) and a supporting piece 4 (37) arranged apart from each other. And a connecting piece 2 (39) for connecting between the supporting pieces 1 (34) and 3 in the connecting piece 1 (38).
(36) and an intermediate portion 1 (40) and a connecting piece 2 (39)
The intermediate portion 2 (41) between the support piece 2 (35) and the support piece 4 (37) in the above is parallel to the substantially "U" -shaped cross section and the intermediate portion 1
The elastic spring piece 1 (44) and the elastic spring piece 2 (4) opposing each other so as to have a substantially inverted "C" -shaped cross section at least partially in a cross section crossing the (40) and the intermediate portion 2 (41).
5), when the partition wall (2) is interposed between the elastic spring piece 1 (44) and the elastic spring piece 2 (45),
An electromagnetic shield connection device, wherein at least one of (44) and the elastic spring piece 2 (45) comes into pressure contact with the partition wall (2). 2. A main structure comprising a first connection part (48) having the connection terminal (30) as a basic structure and a second connection part (49). The first connection part (48) is provided in the first connection part (48). A third support portion (50) having a substantially “U” -shaped cross section and a fourth support portion (51) having a substantially “U” -shaped cross section provided in the second connection portion (49);
The respective substantially "U" -shaped cross sections are arranged to face each other, and the bottom surface 3 (52) of the third support (50) and the fourth
A connection terminal for an electromagnetic shield connection device, wherein the bottom surface 4 (53) of the support portion (51) is connected by a planar common fixing portion (47).