JP2013168469A - Gasket and mobile communication terminal including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket capable of suppressing variation in performance and preventing short-circuiting from occurring between the gasket and other components.SOLUTION: One surface of a gasket 100 is formed of one metal film 220. The other surface of the gasket 100 is formed of the metal film 220 and a double-faced tape 210. A cushion member 230 is used as a contact part. The cushion member 230 is covered with the double-faced tape 210, and the double-faced tape 210 covering the cushion member 230 is covered with the metal film 220.

Description

  The present invention relates to a gasket structure.

  In a mobile communication terminal, a gasket is used to maintain a plurality of substrates. Depending on the circuit configuration mounted on the substrate, a plurality of substrates are stacked via gaskets. The conduction between the substrates is maintained by the gasket.

  Regarding the gasket, for example, Japanese Patent Application Laid-Open No. 2001-094287 (Patent Document 1) discloses “an electromagnetic wave shielding gasket that exhibits a good electromagnetic wave shielding effect and is small, thin, and capable of a complicated shape” ([Summary]). (See [Issue]).

  Japanese Patent Laid-Open No. 2002-111270 (Patent Document 2) discloses an electromagnetic shielding gasket that is used in a gap between conductive cases to block electromagnetic waves and that can prevent deformation of the conductive case due to external force. ing.

JP 2001-094287 A JP 2002-111270 A

  Since the gasket is used by being attached to a structure, a conductive double-sided tape may be used for the conductive contact portion or a part of the double-sided tape may be used for the contact surface. In this case, since the contact is made via the double-sided tape, the contact resistance of the contact portion becomes high, which may cause performance variation.

  Since the gasket is a conductive material, it may be peeled off from the substrate by an external impact or the like in the process of assembling a portable communication terminal or other product, or even in a finished product, and may be short-circuited with other components inside the product. Therefore, there is a request that the gasket must be securely fixed to the substrate. For this reason, it is necessary to take measures such as enclosing the gasket on four sides with walls or fixing the gasket with another sticking material, which increases the cost or may impair downsizing. Therefore, there is a need for a technique that suppresses variations in performance or prevents short circuits with other components.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a gasket in which variation in performance is suppressed. Another object is to provide a gasket in which short circuit with other parts is prevented.

  An object in another aspect is to provide a mobile communication terminal having a gasket in which variation in performance is suppressed. Still another object of the present invention is to provide a mobile communication terminal having a gasket that prevents a short circuit with other components.

  According to one embodiment, a gasket disposed between a first member and a second member includes a cushion member, a sheet-like adhesive member, and a sheet-like conductive member. A partial region of the adhesive member is provided outside the cushion member so as to cover the cushion member. A part of the conductive member is formed outside the adhesive member so as to cover a part of the adhesive member by being bent. The pressure-sensitive adhesive member includes two regions at least one surface of which is not covered with the conductive member.

Preferably, the two regions are configured on the same surface of the gasket.
According to another embodiment, a mobile communication terminal comprising the above gasket is provided.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

It is a figure showing the aspect by which the gasket 100 which concerns on this Embodiment is attached to the board | substrate 110. FIG. It is a figure for demonstrating one aspect | mode of the gasket 200 according to a certain situation. It is a figure for demonstrating one aspect | mode of the gasket 300 according to another situation. It is a figure showing the structure of the gasket which concerns on this Embodiment. It is a figure which illustrates the process in which the gasket 100 is manufactured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 explains how the gasket 100 according to this embodiment is used. FIG. 1 is a diagram illustrating a mode in which the gasket 100 is attached to the substrate 110.

  In one aspect, the gasket 100 is disposed between the substrate 110 and the substrate 120 included in the mobile communication terminal, and maintains conduction between the substrate 110 and the substrate 120. Examples of mobile communication terminals include, but are not limited to, mobile phones, smartphones, tablet terminals, and the like. For example, one surface of the connecting portion 102 of the gasket 100 is attached to the region 112 specified on the substrate 110 based on the design information. The other surface of the connecting portion 102 is attached to the region 122 specified on the substrate 120 based on the design information. At this time, in the case where the region 112 and the region 122 each form a conductive metal part, that is, a part of a circuit, the connection part 102 is made conductive, whereby the substrate 110 and the substrate 120 are provided. Can be conducted.

  Further, a region other than the connection portion 102 in the gasket 100 is used as a so-called tongue portion. That is, when the region has adhesiveness, the gasket 100 can be fixed to both the substrate 110 and the substrate 120. Thereby, the position defect (for example, peeling, deviation, etc.) of the gasket 100 can be prevented.

  With reference to FIG. 2, one embodiment of a gasket 200 according to an aspect will be described. FIG. 2A is a cross-sectional view of the gasket 200 as viewed from the horizontal direction. The gasket 200 includes a double-sided tape 210 disposed so as to cover the cushion member 230, a metal film 220 disposed so as to cover the double-sided tape 210, and a conductive double-sided tape 240.

  FIG. 2B is a diagram illustrating the back surface of the gasket 200. As shown in FIG. 2B, most of the back surface of the gasket 200 according to this aspect is composed of a double-sided tape 240 for adhesion to the substrate. In this case, even if the conductive double-sided tape 240 is used, the contact resistance may increase if the contact pressure between the gasket 200 and the substrate increases. Therefore, the performance of the mobile communication terminal using such a gasket 200 may vary.

  With reference to FIG. 3, an embodiment of a gasket 300 according to another aspect will be described. FIG. 3A is a cross-sectional view of the gasket 300 as viewed from the horizontal direction. The gasket 300 includes a double-sided tape 210 disposed so as to cover the cushion member 230, a metal film 220 disposed so as to cover the double-sided tape 210, and a double-sided tape 240 having electrical conductivity. Conductive double-sided tape 240 is provided on half of the surface of gasket 300.

  FIG. 3B is a diagram illustrating the back surface of the gasket 300. As shown in FIG. 3B, half of the back surface of the gasket 300 according to this aspect is composed of a double-sided tape 240 having electrical conductivity for adhesion to the substrate. The other area is occupied by the conductive surface of the metal film 220. In this case, the contact resistance is reduced by the absence of the conductive double-sided tape 240, but on the contrary, the gasket 300 is easily separated from the substrate due to a decrease in adhesive force. As a result, an accident such as a short circuit may occur inside the mobile communication terminal using the gasket 300.

  With reference to FIG. 4, the structure of the gasket which concerns on this Embodiment is further demonstrated. FIG. 4A is a diagram illustrating one surface of the gasket 100. The one surface of the gasket 100 is composed of a metal film 220. Part of the metal film 220 functions as a contact portion. The contact portion includes a cushion member. Thereby, electrical conductivity is maintained between the one surface and the substrate in contact with the one surface.

  FIG. 4B is a diagram illustrating another surface of the gasket 100. The other surface of the gasket is composed of the metal film 220 and one surface of the double-sided tape 210. A cushion member 230 is included in a region corresponding to the contact portion. As is clear from FIG. 4B, the adhesive surface of the double-sided tape 210 exists at two locations, and therefore the adhesive force between the gasket 100 and the substrate is compared to the case where there is only one adhesive surface. improves. Thereby, it is possible to prevent the gasket 100 from peeling off from the substrate.

  With reference to FIG. 5, the manufacturing method of the gasket 100 which concerns on this Embodiment is demonstrated. FIG. 5 is a diagram illustrating a process in which the gasket 100 is manufactured.

  Referring to FIG. 5A, first, a metal film 220 is prepared. The size of the metal film 220 is defined based on the design information of the substrate on which the gasket 100 is used. FIG. 5B is a view of the metal film 220 as viewed from the cross-sectional direction.

  With reference to FIG. 5C and FIG. 5D, a double-sided tape 210 is prepared for the metal film 220. Thereafter, as shown in FIG. 5E, the metal film 220 and the double-sided tape 210 are bonded together by one surface of the double-sided tape 210.

  5 (F) and 5 (G), cushion member 230 is attached to a location specified in advance on double-sided tape 210 based on design information (FIG. 5 (H)).

  5 (I) and 5 (J), metal film 220 and part of double-sided tape 210 are bent with respect to cushion member 230 to cover cushion member 230 (FIG. 5 (K)). ).

  As apparent from FIG. 5 (I), one surface of the gasket 100 is composed of a metal film 220. As apparent from FIG. 5 (J), the other surface of the gasket 100 is composed of a double-sided tape 210 and a metal film 220. There are two areas of the double-sided tape 210. Thereby, the gasket 100 can be reliably fixed to the substrate by the double-sided tape 210. A part of the metal film 220 is also present on the other surface. Therefore, the electrical conductivity between the other surface and the substrate in contact with the other surface is also maintained.

  As described above, according to the gasket 100 according to the present embodiment, it is possible to maintain the adhesiveness with the substrate while reducing the contact resistance. Thereby, the dispersion | variation in performance of the mobile communication terminal which uses the gasket 100, for example, a mobile telephone, a smart phone, a tablet terminal, etc. can be suppressed. Further, since the gasket 100 is prevented from being peeled off from the substrate, it is possible to prevent the occurrence of a circuit short in the mobile communication terminal.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100, 200, 300 Gasket, 102 Connection part, 110, 120 Substrate, 112, 122 region, 210, 240 Double-sided tape, 220 Metal film, 230 Cushion member.

Claims (3)

A gasket disposed between the first member and the second member,
A cushion member;
A sheet-like adhesive member;
A sheet-like conductive member,
A partial region of the adhesive member is provided outside the cushion member so as to cover the cushion member,
A part of the conductive member is configured on the outside of the adhesive member so as to cover the partial region of the adhesive member by being bent,
The adhesive member includes a gasket including at least two regions where at least one surface is not covered with the conductive member.   The gasket according to claim 1, wherein the two regions are configured on the same surface of the gasket.   A portable communication terminal comprising the gasket according to claim 1.

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