JPH08307084A - Connection structure - Google Patents

Abstract

PURPOSE: To realize a convenient earth connection structure between housings or between the housing and the inner board in which stabilized contact is ensured even if the housing or the inner board is subjected to deformation, e.g. warp, or impact. CONSTITUTION: A conductive earth spring 13 is secured to an earth spring securing boss 15. Since the inside of housing 14 is subjected to shield plating, conduction is sustained between the earth spring 13 and the housing 14. When the housings 14, 11 are fitted under that state, the earth spring 13 is pressed against the rib 12 touching the earth spring of the housing 11 and comes into pressure contact therewith. Consequently, the potential difference is sustained constant between the housings 11, 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connection structure such as a ground connection and a shield connection between respective members such as a housing and a board of a wireless communication device having shield plating.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are perspective views showing a main part of a conventional structure for earth connection between housings and earth connection between housings and a substrate.

For example, as shown in FIG. 3, the structure for connecting the grounds between the casings has an outer peripheral groove 34 provided around the lower casing 35 and a conductive material incorporated in the outer peripheral groove 34. And an outer peripheral rib 32 provided on the upper casing 31.

The inner surfaces of the casings 31 and 35 are electrically conductive, and the grounding gasket 33 incorporated in the outer peripheral groove 34 of the casing 35 is used when the casings 35 and 31 are fitted to each other. By contacting the outer peripheral rib 32 of the casing 31, the potential difference between the casing 31 and the casing 35 is kept the same.

In addition, as shown in FIG. 4, the structure for grounding the housing and the substrate is such that the solid outer ground portion 44 provided on the substrate 42 inside the wireless communication device and the earth rib 43 provided on the housing 41. Composed of.

The surface of the ground rib 43 is electrically conductive, and by fixing the outer peripheral solid ground portion 44 of the substrate 41 directly on the ground rib 43, the substrate 42 and the housing 41 are connected.
The potential difference between them was kept the same.

[0007]

However, in the structure as shown in FIG. 3, it is necessary to increase the thickness of the housing in order to provide the outer peripheral groove 34 in the housing 35. On the other hand, in a wireless communication device, such as a mobile phone terminal, which is becoming smaller, it is necessary to reduce the thickness of the housing in order to effectively use the space inside the housing.

Regarding the ground connection between the housing and the internal substrate as shown in FIG. 4, the outer peripheral solid ground portion 44 and the ground rib 43 are rigid bodies in contact with each other, and the positioning at the time of contact is accurately performed. There was a need. Moreover, there is a possibility that the casing 41 may be deformed such as a warp. When a casing having such a deformation is used, stable contact cannot be obtained even if accurate positioning is performed in advance. It was difficult.

[0009]

In order to solve the problems described above, the connection structure of the present invention prepares a plurality of members having conductive regions and a conductive elastic body.
An elastic body is arranged between the conductive areas of the plurality of members, and the elasticity of the elastic body is used to electrically connect the conductive areas of the plurality of members.

[0010]

With such a connecting structure, the members that need to be electrically connected are connected to each other through the elastic body having conductivity, so that the members may be affected by shock or distortion of the housing. Even if the positional relationship is deviated, the elasticity can maintain the connection.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a main part of the structure of the first embodiment.

In this embodiment, as shown in FIG.
1, housing 14, earth spring contact rib 12, elastic sheet metal ground spring 13, ground spring fixing boss 15 and screw
It consists of 16. The insides of the casing 11 and the casing 14 are both shield-plated and are in a conductive state. Then, when the ground connection between the housings 11 and 14 is made, the connection is made in the following procedure.

First, screw the conductive earth spring 13
It is fixed to the earth spring fixing boss 15 by 16. Then, since the inside of the housing 14 is shield-plated, the conductive state is maintained between the ground spring 13 and the housing 14. Then, when the casing 14 and the casing 11 are put together in this state, the earth spring 13 is pressed against the earth spring contact rib 12 of the casing 11 and comes into contact in a pressed state. Since the inside of the housing 11 is also shield-plated, the ground spring 13 and the housing 11 are also kept in a conductive state. As a result, the potential difference between the case 11 and the case 14 is kept the same.

As described above, according to the first embodiment, the earth spring contact rib 12 and the earth spring 13 are elastically brought into contact with each other, so that the potential between the upper and lower casings is kept constant by the reliable contact. It is possible to Since it is not necessary to use a conductive grounding gasket around the casing as in the conventional case, the groove for the gasket is not required and the thickness of the casing can be reduced. As a result, the thickness of the housing is determined by the thickness required for strength, and the space inside the housing can be effectively used.

Further, when the earth spring 13 is screwed to the earth spring fixing boss 15, the board 17 is also tightened so that the earth spring fixing boss 15 can also be used for fixing the board 17. With such a structure, the ground of the board 17 can be surely connected to the upper and lower housings 11 and 14, so that the potential difference between the board 17, the housing 11 and the housing 14 can be made constant.

FIG. 2 is a block diagram showing a second embodiment of the present invention. Except for the shape of the earth spring 13a, the structure is the same as that of the first embodiment, so the other components are given the same reference numerals and detailed description thereof is omitted.

The earth spring 13a of the second embodiment is provided with a rotation preventing pawl 18 to prevent the earth spring 13a itself from rotating when screwed with a screwdriver.

The anti-rotation pawl 18 is caught on the board end 19 of the board 17 when the earth spring 13a is fixed to the earth spring fixing boss 15 together with the board 17 by the screw 16. As a result, inadvertent rotation of the ground spring 13a is prevented, and accurate positioning is possible.

In the second embodiment, the end portion of the substrate is used for rotation prevention, but the rotation prevention and positioning functions can be achieved even if the rotation prevention claw is hooked on the housing.

In the first and second embodiments, the screw 16 is used to fix the earth spring 13 or 13a. However, as shown in FIG. 5, a housing spring 14 is provided with a ground spring fixing rib 21. It is also possible to fix the ground spring fixing rib 21 and the fitting portion 20 of the ground spring 13b by engaging with each other. With such a configuration, the efficiency of the assembly work can be expected by reducing the number of parts.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing the main part of the structure of the third embodiment.

This embodiment relates to the ground connection between the housing and the internal board. The board 62 has an outer peripheral solid earth portion 64 as in the conventional case, and the housing 61 also has the ground rib 63 as in the conventional case. The inner surface of the housing 61 including the ground rib 63 is shield-plated. Then, the housing and the internal substrate are connected by an earth spring 65 having an earth contact plate 66.

A housing 61 and a substrate 62 using the earth spring 65
The procedure of ground connection with and will be explained step by step.

First, the fitting portion of the ground spring 65 is fitted into the solid outer ground portion 64 of the substrate 62. At this time, the dimension b of the fitting portion of the ground spring 65 is set smaller than the plate thickness a of the substrate 62. For this reason, when the ground spring 65 is fitted into the substrate 62, it is elastically fixed, and the outer peripheral solid ground portion of the substrate 62 is fixed.
It is securely connected to the 64, and will not fall out while handling.

Next, the substrate 62 to which the earth spring 65 is fixed is incorporated into the housing 61. At this time, the ground contact plate 66 of the ground spring 65 flexes due to elasticity, and the outer peripheral surface 67 of the ground rib 63.
The outer peripheral solid earth 64 of the substrate 62 and the housing 61 are grounded.

As described above, according to the third embodiment, the elasticity of the earth spring 65 keeps the contact between the board outer peripheral solid earth portion 64 and the housing earth rib 63, so that vibration or vibration is more likely to occur than that between rigid bodies. It is stable and not easily affected by misalignment. Further, even if the housing has a warp or the like and an error such as a contact position occurs, the error can be absorbed by the deflection of the earth spring 65, so that a reliable ground that is not easily affected by the error of the housing shape or the like. You can expect a connection.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment also relates to the ground connection between the housing and the internal substrate. The difference between the third embodiment and the third embodiment lies in the shape of the ground spring 65a and the contact point between the ground spring 65a and the ground rib 63. Therefore, only the shape of the ground spring 65a and the contact portion of the ground rib 63 will be described, and other configurations will be denoted by the same reference numerals as those in FIG. 6 and detailed description thereof will be described.

In a wireless communication terminal such as a mobile phone terminal, the downsizing of the entire device leads to the downsizing of parts, and the earth rib
It may be necessary to reduce the height of 63. However, in the structure of the third embodiment, since the earth contact plate 66 is in contact with the outer peripheral surface 67 of the earth rib by utilizing the bending due to elasticity, when the earth rib 63 becomes lower, the length of the earth contact plate 66 becomes shorter. It is difficult to use the effect of the deflection.

On the other hand, in this embodiment, the earth spring 65a shown in FIG. 7 has a shape such that the position of the earth contact plate 66a is in contact with the top surface 68 of the case earth rib.

The earth spring 65a of the fourth embodiment is similar to that of the third embodiment in that the outer peripheral solid earth portion of the substrate 62 is solid.
It is fixed to 64, and its substrate 62 is incorporated into the housing 61.

At this time, the earth contact plate 66a of the earth spring 65a.
Has a substantially V-shape, and the convex part of the F-shape contacts with the earth rib top surface 68, which holds the connection between the outer peripheral solid earth part 64 of the substrate 62 and the housing 61. become.

According to the fourth embodiment, since the height of the ground rib 63 can be reduced, the elasticity of the ground spring 65a can be sufficiently secured even inside the housing of the miniaturized device. This makes it possible to secure a stable connection between the board outer peripheral solid ground portion 64 and the housing 61.

Further, a fifth embodiment of the present invention will be described with reference to FIG. This fifth embodiment is also related to the ground connection between the housing and the internal board, and the difference from the fifth embodiment is that when the housing 61 and the board 62 are grounded, they are also flexible. The point is to fix the shield sheet (or sheet metal shield plate) 69 having the property to the substrate. Therefore, other configurations will be denoted by the same reference numerals as those in FIG. 7, and detailed omissions will be described.

Conventionally, when a flexible shield sheet or a shield plate made of sheet metal is fixed to a substrate, the shield sheet or the like is fixed by soldering to the outer peripheral portion of the substrate.

However, a large space for solder cannot be secured in the outer peripheral portion of the substrate, and it is difficult to obtain sufficient fixing strength. For that reason, the strength is maintained by soldering a large number of places, which is not satisfactory in terms of workability.

Therefore, in the fifth embodiment, the function of the earth spring 65a fixed to the end of the substrate 62 as a clip for elastically holding the sandwiched one is utilized to sandwich and fix the shield sheet 69 together with the substrate. It was done like this. By thus setting the outer periphery of the shield sheet 69 to be a solid earth, the shield sheet 69, the substrate 62, and the casing 61 are all grounded when assembled in the casing 61, and the potential difference can be kept constant.

As described above, with such a structure, sufficient fixing strength can be easily obtained without performing another step such as soldering at a large number of places.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
A description will be given using (a) and (b). FIG. 9A is a perspective view showing the structure of this embodiment, and FIG. 9B is a sectional view showing the AA cross section of the laminated substrate 902. This embodiment is an example in which the present invention is applied to a shield structure of a mobile phone in which an earth pattern provided on a laminated substrate having a wireless section is earth-connected to a rib of a casing whose inside is shield-plated.

A laminated substrate 90 having 6 layers shown in FIG.
2 has a function block of the wireless unit 901. The ground pattern portion 916, which is a partition of this functional block, has rib dimensions of the rib 906 provided in the case 907, which is a housing.
The fourth layer copper foil 908 of the laminated substrate 902 has a width almost equal to that of the 904.
The groove is formed by hollowing out to the part. After applying the solder plating 909 to the bottom surface of the groove and its periphery, a metal leaf spring 911 having elasticity is fixed by solder 912.
The laminated substrate 902 to which the leaf spring 911 is fixed is put in a case 907 having a plating or conductive coating layer 905 on the inner surface, and ribs.
906 and the leaf spring 911 inside the laminated substrate are brought into close contact with each other in a pressed state and fixed by screws 910, so that each functional block is shielded.

With this structure, the laminated substrate 90
Since the leaf spring 911 is fixed by the solder 912 to the earth pattern 916 of the groove provided in 2, the elasticity of the leaf spring 911 is used to maintain contact with the rib 906, and each functional block in the wireless unit 901 is kept. It is possible to prevent the leakage of radio waves and noise by partitioning. Moreover, since the leaf spring 911 can be handled in the same manner as general components, the leaf spring 911 can be soldered together when the components of the wireless unit 901 are mounted on the laminated substrate 902, which improves workability and reduces cost. The effect is obtained.

In the first to sixth embodiments described above, the metal spring having elasticity is used for the ground connection, but the present invention is not limited to this, and a conductive gasket or the like is used. Can also be used.

A seventh embodiment using this conductive gasket will be described with reference to FIGS. 10 (a) and 10 (b). FIG.
0 (a) is a perspective view showing the structure of this embodiment,
FIG. 10B is a sectional view showing an AA section of the laminated substrate 902. In addition, in this embodiment, similarly to the sixth embodiment, the ground pattern provided on the laminated substrate having the wireless section is
It is an example in which the present invention is applied to a shield structure of a mobile phone, which is grounded to a rib of a casing whose inside is shield-plated.

A laminated substrate having 6 layers shown in FIG.
Reference numeral 902 has the functional blocks of the wireless unit 901. In the earth pattern part 916 which is the partition of this functional block,
The copper foil 90 of the fourth layer of the laminated substrate 902 has a width almost equal to the rib size 904 of the rib 906 provided in the case 907 as the housing.
A groove is formed by hollowing out up to part 8. After the solder plating 909 is applied to the bottom surface of this groove and its periphery, a conductive gasket 903 having elasticity is fitted or filled. Laminated substrate 902 to which this conductive gasket 903 is fixed
Is placed in a case 907 having a plated or conductive coating layer 905 on its inner surface, the rib 906 and the conductive gasket 903 inside the laminated substrate are pressed against each other, and fixed with screws 910 to shield each functional block. It is structured to do.

According to the structure of the seventh embodiment,
Since the width dimension of the ground pattern 916 of the partition of the wireless section 901 is about the same as the rib dimension 904, the mounting area of the wireless section 901 can be made large, and the device can be downsized even if the number of parts is increased. Further, since the conductive gaskets 903 are in contact with each other in a compressed state, it is possible to prevent noise and radio waves from being emitted due to a gap in the contact portion of the conductive gasket 903 due to impact or distortion of the housing.

[0045]

As described in detail above, according to the present invention, the area between the members for earth connection is minimized,
Since the connection is made via the elastic body having conductivity, a highly reliable electrical connection structure in which no gap is generated due to impact or distortion of the housing can be realized by a simple process.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a structure according to a first embodiment.

FIG. 2 is a perspective view showing a main part of the structure of the second embodiment.

FIG. 3 is a perspective view showing a main part of a conventional structure for ground connection between housings and ground connection between housings and a substrate.

FIG. 4 is a perspective view showing a main part of a conventional structure for earth connection between housings and earth connection between housings and a substrate.

FIG. 5 is provided with a ground spring fixing rib 21 in the housing 14 instead of the screw 16 in the first and second embodiments, and the ground spring fixing rib 21 and the fitting portion 20 of the ground spring 13b are engaged with each other. It is a perspective view showing the composition to fix.

FIG. 6 is a perspective view showing a main part of the structure of the third embodiment.

FIG. 7 is a perspective view showing a main part of the structure of the fourth embodiment.

FIG. 8 is a perspective view showing a main part of the structure of the fifth embodiment.

9A is a perspective view showing a structure of a sixth embodiment, and FIG. 9B is a sectional view showing a cross section AA of a laminated substrate 902 in this embodiment.

10A is a perspective view showing a structure of a seventh embodiment, and FIG. 10B is a sectional view showing a cross section AA of a laminated substrate 902 in this embodiment.

[Explanation of symbols]

 11, 14, 31, 35, 41, 61 Housing 13, 13a, 65, 65a Ground spring 15 Ground spring fixing boss 16 Screws 17, 42, 62 Board 18 Anti-rotation pawl 32 Outer peripheral rib 34 Outer peripheral groove 33 Grounding gasket 43, 63 Earth ribs 44, 64 Solid outer ground section 69 Shield sheet 901 Radio section 902 Laminated board 903 Conductive gasket 904 Rib size 905 Plating or conductive coating layer 906 Rib 907 Case 908 Copper foil 909 Solder plating 910 Screw 911 Leaf spring 912 Solder 916 Ground pattern

Claims (4)

[Claims] 1. A plurality of members having conductive regions, and an elastic body having conductivity, wherein the elastic body is arranged between the conductive regions of the plurality of members, and A connection structure characterized by electrically connecting electrically conductive regions of the plurality of members by utilizing elasticity. 2. A plurality of casings having conductive shield plating on an inner surface thereof, and a sheet metal grounding spring, and the plurality of casings are arranged so that the grounding springs come into contact with the respective inner surfaces of the casings. A connection structure characterized in that the elasticity of the earth spring is used to perform the earth connection of the plurality of casings. 3. An earth spring, comprising: a casing having an earth rib plated on the inner surface thereof with conductive shield plating; a substrate having a solid earth on an outer peripheral portion; and a sheet metal earth spring attached to the solid earth of the substrate. And a grounding connection between the substrate and the case by utilizing elasticity of the grounding spring. 4. A laminated substrate having a groove formed in an earth pattern region, an elastic body having conductivity provided in the groove, and a housing having conductive shield plating on an inner surface thereof. A connection structure in which an elastic body is brought into contact with the conductive shield plating to shield the functional block portion provided on the laminated substrate by utilizing the elasticity of the elastic body.