JP2001068183A - Connecting structure between terminals - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide connecting structure between terminals capable of absorbing dimensional dispersion in production and preventing deformation during production. SOLUTION: This connecting structure is composed of a terminal 20 on an FPC(a flexible printed circuit) 13 connected to a liquid crystal display part; a corrugated rubber 2 arranged on the opposite side to the terminal 20 through the FPC, pressing the FPC to the terminal 20 side; and a leaf spring connector 6 installed on a main substrate 4, containing a leaf spring terminal conductor 61 coming in contact with the terminal 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connection structure for press-connecting a terminal on a substrate connected to an electronic component to a terminal on another substrate, and more particularly to a terminal connection structure for connecting an electronic component to another terminal. The present invention relates to a terminal-to-terminal connection structure capable of absorbing a manufacturing variation in the distance between the two substrates and press-connecting the terminal.

[0002]

2. Description of the Related Art Prior to the description of the prior art, an example in which a liquid crystal display unit of a portable telephone is taken as an electronic component will be described. In this case, a substrate provided with terminals for connecting to electronic components is provided by a flexible printed circuit (FPC) connected to a liquid crystal display panel.
Circuit), and a terminal connected to a terminal formed on the FPC is a terminal provided on a substrate of a housing of the mobile phone. With reference to FIGS. 8 to 12, a description will be given of a terminal connection structure and an assembling procedure of a conventional mobile phone.

In FIG. 8, a liquid crystal display unit 110
Constitutes the liquid crystal display of the mobile phone handset. The liquid crystal display panel 103 has its claw portions 131 and 132
1 to form a front surface. The FPC 113 connected to the liquid crystal display panel is bent at the connection portion and forms the back surface of the liquid crystal panel holder 101. On the back surface of the liquid crystal plate holder 101, as shown in FIG.
15 and 116 are pins 1 standing on the back surface of the liquid crystal plate holder.
17 and 118 are fitted. The FPC 113 is provided with a terminal 120 connected to a pixel or the like (not shown) included in the liquid crystal display panel 103. Usually, this terminal 1
Reference numeral 20 denotes a plurality of terminals that are connected to the respective parts constituting the liquid crystal display panel 103, respectively. Then, FIG.
As shown in FIG. 0, the rear surface of the liquid crystal display unit 110 is connected to a main body (hereinafter, referred to as a “main body”)
Toward No. 4, the terminal conductors of the terminals 120 on the FPC and the terminal conductors 161 of the leaf spring connector 106, which are terminals provided on the main body main board, are aligned with each other. For alignment, the nails 135 and 136 on the side of the liquid crystal display unit are fitted with the concave portions 137 and 138 of the main body.
It is performed by fitting it into.

The leaf spring connector protrudes far above the upper end of the main body main board 104 or the storage portion 126 of the leaf spring connector 106 in order to absorb dimensional variations in the fitting structure. When the terminal 120 on the FPC is connected to the leaf spring connector 106 which is a terminal on the main body main board, the leaf spring connector is connected to the terminal 12.
Upon receiving a pressure from 0, the shape changes as shown in FIGS. According to the above connection structure between terminals, even if a variation occurs in the dimension A, the variation is absorbed by the flexure b of the leaf spring connector, and it is possible to secure a reliable pressure connection.

[0005]

When the above-mentioned leaf spring connector 106 is used, it is possible to absorb a dimensional variation in manufacturing and to perform a reliable press connection between terminals. But,
Since the leaf spring connector has a large projecting amount, the leaf spring connector 106 is deformed by coming into contact with various objects when the liquid crystal display unit is incorporated during handling of the main board. For this reason, one of the leaf spring connectors may be missing or contact with an adjacent leaf spring connector to cause a malfunction.

An object of the present invention is to provide an inter-terminal connection structure capable of absorbing dimensional variations in manufacturing and hardly causing deformation or the like during manufacturing, and capable of reliable press-fit connection. .

[0007]

According to a first aspect of the present invention, there is provided an inter-terminal connection structure, comprising: a first terminal on a first substrate connected to an electronic component; and an opposite side of the first substrate with respect to the first terminal. And an elastic body that pushes the first substrate toward the first terminal,
A second terminal provided on the second substrate and in contact with the first terminal;
Terminals.

[0008] With the above structure, the first substrate is pressed against the second substrate by the elastic force of the elastic body, and the first terminal and the second terminal are press-connected. Further, variation in the distance between the first and second substrates can be absorbed by the amount of deformation of the elastic body. Therefore, even if the second terminal does not increase the amount of protrusion from the second substrate, the variation in the distance between the substrates can be absorbed by the amount of deformation of the elastic body.
As a result, in the product assembling process, the second terminal
It is possible to manufacture a product with a high yield without causing deformation or dropout of the second terminal, which is likely to occur when the amount of protrusion from the substrate is large, and it is possible to obtain high quality and reduce manufacturing cost. Become.

For example, by using a corrugated rubber in which a waveform is repeated in the direction along the first substrate surface as described in claim 2, even if the inter-substrate distance varies greatly, the elastic body can be made to have a large variation. Can be easily absorbed.

Since the corrugated rubber has a large amount of deformation, even if the distance between the first and second substrates varies greatly, it can be absorbed by the amount of deformation. Therefore, even if the second terminal does not increase the amount of protrusion from the second substrate,
Variations in the distance between the substrates can be absorbed by the deformation of the corrugated rubber. FIG. 1 is a view showing the relationship between the load and deflection of a leaf spring connector conventionally used as a member corresponding to the corrugated rubber and the second terminal of the present invention. The leaf spring connector in the conventional example requires a load proportional to the amount of deflection, but the corrugated rubber of the present invention can increase the amount of deflection with a substantially constant load. Since the corrugated rubber has such a load-deflection characteristic, even if the distance between the substrates is large, it can be reliably absorbed by the flexure of the corrugated rubber.

According to the third aspect of the present invention, the second terminal has a portion protruding from the second substrate surface toward the first terminal. With such a configuration, the first
It is easy to secure normal contact between the terminals when the terminals abut on the second substrate surface, and it is possible to easily press-connect the terminals.

In the inter-terminal connection structure according to a fourth aspect of the present invention, when the liquid crystal display portion is incorporated in the main body, the electronic component is a liquid crystal display portion, and the first terminal is an F connected to the liquid crystal display portion.
It is a terminal on a PC (Flexible Printed Circuit).

When incorporating the liquid crystal display unit into the liquid crystal display unit, an FPC is usually used. Since the FPC has low rigidity, a pressure connection structure between terminals that ensures electrical connection can be obtained by applying pressure by the elastic force of the corrugated rubber. Therefore, in the case where the substrate connected to the electronic component is not limited to the mobile phone but is an FPC connected to the liquid crystal display unit, the effect of the corrugated rubber can be particularly effectively exerted.

[0014] In the inter-terminal connection structure according to the fifth aspect of the present invention, the pressure contact force between the terminals can be increased by using the leaf spring connector as the second terminal. The amount of protrusion of the leaf spring connector is set to an amount smaller than an amount at which deformation or omission becomes a problem during assembly. As a result, a large pressing force can be secured between the terminals without worrying about chipping or deformation during manufacture of the product. Needless to say, variations in the distance between the substrates can be absorbed by deformation of the corrugated rubber.

In the inter-terminal connection structure according to the sixth aspect of the present invention, the manufacturing cost can be reduced by using the fixed terminal connector as the second terminal. Originally, the fixed terminal connector does not have a large protrusion amount, and deformation or omission during manufacture does not pose a problem. Further, since the fixed terminal connector is less expensive than the leaf spring connector, it is effective in reducing the cost of the product.
Since the fixed terminal connector hardly bends, the variation in the distance between the substrates is absorbed by the warpage of the corrugated rubber.

In the terminal connection structure according to a seventh aspect of the present invention, in the terminal connection structure according to the sixth aspect, the second terminal includes a plurality of fixed terminal conductors, each of the fixed terminal conductors being: It has two or more protrusions protruding toward the first terminal. With this structure, incomplete contact is prevented from being formed over the entire terminal surface, and complete contact is secured at one of the two or more protrusions. As a result, it is possible to secure the connection between the terminals of the two substrates by absorbing the variation in the distance between the substrates with the corrugated rubber without worrying about deformation or the like during manufacturing.

In the inter-terminal connection structure according to the present invention, the first substrate and the second substrate are aligned by the alignment means. As described above, by providing the positioning means, even when the width of each connecting portion constituting the terminal becomes narrow, it is possible to accurately perform the press-fitting connection, thereby ensuring high quality and improving the yield. Can be achieved.

According to a ninth aspect of the present invention, in the inter-terminal connection structure of the eighth aspect, the positioning means includes a pin provided on one of the first and second substrates,
A pin hole provided in the other of the first and second substrates so as to insert and fit the pin. The pins and the pin holes can be easily provided on both of the first and second substrates, and it is easy to secure the accuracy of about the width of the connecting portion constituting the terminal. Therefore, it is possible to realize low-cost alignment with sufficient accuracy for terminal connection between substrates.

When the present invention is embodied in a portable telephone, the electronic component is a liquid crystal display of the portable telephone, and the second terminal is provided on the main board of the main body. Terminal.

According to the above configuration, by using a corrugated rubber or the like as the elastic body and using a leaf spring connector or a fixed terminal connector as the second terminal, it is possible to prevent the second terminal from being deformed or falling off during manufacture. It is possible to realize an inter-terminal structure capable of absorbing variations in the inter-substrate distance in manufacturing without taking any steps. Note that an FPC is usually used for a substrate connected to a liquid crystal display portion of a mobile phone.

[0021]

Next, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) In FIG.
The corrugated rubber 2 as an elastic body in the present invention is mounted on the pins 17 and 18 erected on the right side. On top of that, the FPC 13 having the terminal 20 is superimposed on the holes 15, 16 through the pins 17, 18. The corrugated portion of the corrugated rubber 2 is the terminal 20 after the FPC is laminated.
Is located on the back side corresponding to the position. The liquid crystal display unit 10 assembled as described above is mounted on the main body main board 4 with the FPC 13 facing the main body main board 4 as shown in FIG. The body main board 4 is provided with a leaf spring connector 6 having a plurality of leaf spring terminal conductors 61. The amount of protrusion of each leaf spring terminal conductor 61 from the main body main board is set to such a size that lack or deformation of each leaf spring, which has conventionally been a problem, does not matter. The amount of protrusion of each leaf spring terminal conductor 61 is determined by the housing 25 of the leaf spring connector.
With the head slightly raised above. However, the leaf spring terminal conductor 61 has a portion located closer to the FPC side than the main body main board 4 in order to avoid hindering normal connection between the terminals due to contact between the main body main board surface and the terminals 20. Have. Main body 11 of liquid crystal display unit 10
At the time of mounting on the liquid crystal display unit 10, the side claws 35, 3
6 is fitted into the fitting recesses 37 and 38 of the main body 11. Furthermore, pins 17 and 18 erected on the back surface of the liquid crystal display unit 10 are inserted into pin holes 45 and 46 formed in the substrate 4 on the main body side in order to increase the accuracy of alignment between the liquid crystal display unit 10 and the main body 11. It is.

FIG. 4 is a cross-sectional view showing the configuration at the stage when the terminal connection between the substrates is completed. The terminal 20 provided on the FPC 13 and the terminal conductor 61 of the leaf spring connector which is a terminal provided on the substrate 4 are connected by pressure. Corrugated rubber 2 for applying pressure and terminal conductor 61 of leaf spring connector
Have produced flexures a and b, respectively, as shown in FIG. Since the amount of protrusion of the leaf spring connector is suppressed to such a degree that deformation or omission during assembly does not become a problem, the flexure a of the corrugated rubber is greater than the flexure b of the leaf spring connector.

Since the variation of the dimension A in FIG. 4 is absorbed by the flexure a of the corrugated rubber and the flexure b of the leaf spring connector, the terminal connection between the substrates is reliably realized, and a high quality product can be supplied. Becomes Dimension A
Is not the literal distance between the boards, but is a manageable distance between the components including the distance between the boards, and thus is used to determine the variation in the distance between the boards.

(Embodiment 2) FIG. 6 is a sectional view of an inter-terminal connection structure when a fixed terminal connector is used as a second terminal. In the present embodiment, a plurality of fixed terminal conductors 56 constituting a fixed terminal are provided instead of terminal conductor 61 in the first embodiment. Since each fixed terminal conductor 56 is fixed by the fixed terminal frame 55,
No deflection occurs. Accordingly, the absorption of the variation in the dimension A is absorbed solely by the deflection a of the corrugated rubber 2 as shown in FIG. Each of the fixed terminal conductors 56 of the fixed terminal connector has two convex portions 56a, 5
6b is provided, so that even if the pressure of the pressure contact is slightly low, the area of the connection portion is small and the protrusion protrudes, so that reliable connection can be realized. Since the fixed terminal connector is less expensive than the leaf spring connector, the manufacturing cost is reduced by using the fixed terminal connector, and the variation in the dimension A is absorbed by the flexure a of the corrugated rubber, so that the reliable inter-board terminal connection is achieved. It can be realized. Note that the number of protrusions provided on the fixed terminal conductor is not limited to two, and may be provided more.

Although the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. Not limited. The scope of the present invention is shown by the description of the claims, and further includes the meaning equivalent to the description of the claims and all changes within the scope.

[0027]

According to the present invention, even when the distance between the substrates is varied, the variation is absorbed by the flexure of the elastic body or by the flexure of both the elastic body and the second terminal, and the reliable inter-substrate distance is obtained. Terminal connection can be realized. In particular, by using the corrugated rubber as the elastic body and the fixed terminal connector as the second terminal, it is possible to form the inter-terminal connection structure at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a load of a corrugated rubber and a leaf spring connector and a deflection amount.

FIG. 2 is a diagram showing a process of mounting an FPC after mounting a corrugated rubber on a back surface of a liquid crystal display panel holder in the first embodiment.

FIG. 3 is a diagram illustrating a process of attaching the liquid crystal display unit to the main body of the mobile phone in the first embodiment.

FIG. 4 is a cross-sectional view of the terminal connection structure according to the first embodiment.

FIG. 5 is a cross-sectional view showing deflection of a corrugated rubber and a leaf spring conductor according to the first embodiment. (a) is a corrugated rubber,
(B) is a sectional view showing a leaf spring conductor.

FIG. 6 is a cross-sectional view of an inter-terminal connection structure according to a second embodiment.

FIG. 7 is a cross-sectional view illustrating deflection of a corrugated rubber and a fixed terminal conductor according to the second embodiment. (a) is a sectional view showing a corrugated rubber, and (b) is a sectional view showing a fixed terminal conductor.

FIG. 8 is a sketch showing a step of attaching a conventional liquid crystal display panel to a holder.

FIG. 9 is a sketch of a step of mounting a conventional FPC on the back surface of a liquid crystal display holder.

FIG. 10 is a sketch showing a process of attaching the liquid crystal display unit to the main body of the mobile phone.

FIG. 11 is a cross-sectional view showing a conventional inter-terminal connection structure using a leaf spring connector having a large protrusion amount.

FIG. 12 is a cross-sectional view showing a deflection of a leaf spring connector in a conventional inter-board terminal structure.

[Explanation of symbols]

1 liquid crystal display board holder, 2 corrugated rubber, 3 liquid crystal display board, 4 body board of mobile phone, 6 leaf spring connector,
10 liquid crystal display unit, 11 mobile phone body, 13
FCP, 15, 16 pin hole, 17, 18 pin, 2
0 Terminal on electronic component side, 25 leaf spring connector frame, 3
5, 36 Side claw of liquid crystal display unit, 37, 38 Body side fitting recess, 45, 46 Body board pin hole, 5
5 Fixed terminal connector frame, 56 Fixed terminal conductor, 56
a, 56b Projection of fixed terminal conductor, 61 Leaf spring terminal conductor, a Deflection amount of corrugated rubber, b Deflection amount of leaf spring terminal conductor of leaf spring connector, A Distance between boards (between components).

Continued on the front page F term (reference) 5E023 AA04 AA16 AA18 AA30 BB01 BB09 BB22 BB23 BB29 CC05 CC22 DD26 EE09 GG02 GG15 HH01 HH08 HH17 5E344 AA01 BB02 BB04 CD15 CD18 CD28 EE11

Claims (10)

[Claims] A first substrate connected to an electronic component on a first substrate;
A terminal, an elastic body disposed on the opposite side of the first substrate from the first terminal, and pressing the first substrate toward the first terminal; and an elastic member provided on the second substrate. An inter-terminal connection structure including the first terminal and a second terminal in contact with the first terminal. 2. The terminal connection structure according to claim 1, wherein the elastic body is a corrugated rubber whose waveform is repeated in a direction along the first substrate surface. 3. The terminal connection structure according to claim 1, wherein the second terminal has a portion protruding from the second substrate surface toward the first terminal. 4. An FPC (Flexible Flexible Display) wherein said electronic component is a liquid crystal display and said first terminal is connected to said liquid crystal display.
The terminal connection structure according to any one of claims 1 to 3, which is a terminal on a printed circuit. 5. The terminal connection structure according to claim 1, wherein said second terminal is a leaf spring connector. 6. The terminal connection structure according to claim 1, wherein the second terminal is a fixed terminal connector. 7. The second terminal according to claim 6, wherein the second terminal includes a plurality of fixed terminal conductors, and each of the fixed terminal conductors has two or more protrusions protruding toward the first terminal. Terminal connection structure. 8. The first substrate and the second substrate,
The terminal connection structure according to any one of claims 1 to 7, wherein the positioning is performed by a positioning unit. 9. The positioning means is provided on a pin provided on one of the first and second substrates, and is provided on the other of the first and second substrates so as to insert and fit the pin. The terminal connection structure according to claim 8, further comprising a pin hole. 10. The mobile phone according to claim 1, wherein the electronic component is a liquid crystal display of a mobile phone, and the second terminal is a terminal provided on a main board of the mobile phone. Terminal connection structure.