JP3100753U - Sound component holder - Google Patents

Abstract

The present invention provides an acoustic component holder capable of reducing the compression clamping force of a conductive rubber connector and performing stable electrical connection.
A holder (1) for connecting an acoustic component incorporated in a main body of a portable communication terminal, wherein a metal coil spring is embedded in a part of a molded product (5) holding the acoustic component. The holder (1) covers at least a part of the acoustic component, and is electrically connected to an electrode on a circuit board via the metal coil spring.
[Selection diagram] FIG.

Description

The present invention relates to a holder for holding an acoustic component incorporated in a main body of a mobile communication terminal, such as a mobile phone, and for making an electrical connection to an electrode on a circuit board.

A method for electrically connecting electronic components such as a microphone and a speaker, which are acoustic components used in a mobile communication terminal, such as a mobile phone, a mobile information terminal, etc., to an electrode on a circuit board inside the mobile communication terminal, In many cases, terminals or lead wires of acoustic components are directly connected to a board by soldering. This operation requires a lot of assembly costs because the operator manually solders the lead wires. Another method is to attach the conductive rubber connector to the electrode surface of the acoustic component with an adhesive or the like, insert the acoustic component into the storage space of the holder, press and hold it from above and below, and attach it to the electrode on the circuit board. There are many connection methods (Patent Documents 1 to 4 below).
JP-A-10-233828 JP-A-11-41683 JP-A-2002-84587 Japanese Patent No. 3361253

接 続 The conventional connection method such as soldering with lead wires required a lot of assembly costs because the workers manually soldered the lead wires. In addition, the connection of the acoustic component by the conductive rubber connector means that the electrical connection between the electrode on the circuit board inside the mobile communication terminal and the acoustic component cannot be secured unless an appropriate compression pinching force is applied to the conductive rubber connector. There was a problem.

In order to solve the above-mentioned conventional problems, it is an object of the present invention to provide a sound component holder capable of reducing a compressive holding force of a conductive rubber connector and performing stable electrical connection.

To achieve the above object, the acoustic component holder of the present invention is a holder for connecting an acoustic component incorporated inside the main body of the portable communication terminal, and a metal part is formed on a part of a molded product holding the acoustic component. The coil spring is embedded and integrally molded, and the holder covers at least a part of the acoustic component, and is electrically connected to an electrode on a circuit board via the metal coil spring.

The holder of the present invention makes it easier and more reliable to mount components inside the mobile communication terminal, can reduce the compressive clamping force, can take an electrically stable connection, and contributes to the improvement of productivity. Can be.

The holder of the present invention is a holder for the purpose of stably establishing an electrical connection between an acoustic component incorporated in the portable communication terminal and an electrode of a circuit board, and a metal coil spring is formed of an elastomer. The metal coil spring is disposed at a position where the holder covers a part of the acoustic component and comes into contact with the electrode part of the acoustic component. According to this configuration, since the metal coil spring is integrally molded with the holder, the metal coil spring does not come off from the holder and fall off. In addition, since the metal coil spring is molded integrally with the holder, the metal coil spring does not bend and deform or tilt when connecting it to the electrode on the circuit board by compressing it inside the mobile communication terminal. Stable electrical connection to the electrodes on the base can be obtained. Since the metal coil spring has elasticity, the compression and clamping force can be reduced.

に お い て In the present invention, it is preferable that at least the distal end of the metal coil spring protrudes from the holder bottom surface and is integrally formed. According to such a preferred shape, the connection reliability between the electrodes of the stored acoustic components and the electrodes on the circuit board can be improved. It is preferable that at least both ends of the metal coil spring protrude from the holder surface by a length of 1 μm or more and 200 μm or less. More preferably, it protrudes from 50 to 150 μm, particularly preferably about 100 μm.

The holder is preferably made of an elastomer.

The holder of the present invention is configured by storing audio components in the storage space of the holder, thereby ensuring stable connection of the audio components inside the portable communication terminal to the electrodes on the circuit board. And the pressing load can be reduced.

According to the present invention, a metal coil spring is integrally molded with a holder for holding an acoustic component, a part of the holder molded with an elastomer covers at least a part of the small acoustic component, and a metal coil spring is formed. Is placed in contact with the electrode part of the acoustic component, so that the acoustic component is installed inside the portable communication terminal and is compressed and sandwiched with the circuit board to stably connect to the electrode on the circuit board. Electrical connection can be made, and the pressing load can be reduced. Further, there is an advantage that assembly cost for mounting can be reduced. Examples of the elastomer material constituting the holder include polybutadiene, natural rubber, polyisoprene, butadiene-styrene copolymer (SBR), butadiene-acrylonitrile copolymer (NBR), and ethylene-propylene non-conjugated diene copolymer (EPDM). , Ethylene-propylene copolymer (EPM), polyurethane polyester rubber, chloroprene rubber, epichlorohydrin rubber, and silicone rubber. Silicone rubber is most preferred in view of electrical properties, compression set, weather resistance and the like. For example, SH831U manufactured by Toray Dow Corning Silicone Co., Ltd. can be used.

Examples of the metal material constituting the metal coil spring for electrical connection include phosphor bronze, beryllium copper, nickel, tungsten, a piano wire class A (SWPA) defined in JIS G3522 (piano wire), and JIS G4314 (stainless steel for spring). A type B (SUS304WP-B) specified in JIS G4314 (stainless steel wire for spring) is most preferable from the viewpoint of spring characteristics and plating properties. In addition, the surface of metal coil springs is metal-plated to prevent corrosion due to air pollution, the effect of organic vapors, sulfuration, etc., and to provide a stable electrical connection surface.There are many types of metal plating. For the above reasons, gold plating is most preferable.

Hereinafter, description will be made with reference to the drawings. FIG. 1 is a side view of an acoustic component holder 1 of the present embodiment, FIG. 2 is a plan view of the same, FIG. 3 is a sectional view taken along line II of FIG. 2, and FIG. 4 is an enlarged view of a portion X in FIG. Reference numeral 2 denotes an edge forming an upper window of the holder, 3 denotes a side wall, 4 denotes a protrusion electrically connected to an electrode (not shown) on a circuit board, 5 denotes a bottom wall of the elastomer holder, and 6 denotes a bottom wall of the elastomer holder. An acoustic component (for example, a microphone) accommodating portion, 7 is a metal coil spring, and 7a and 7b are protrusions of the coil spring. In the embodiment shown in FIGS. 1 to 4, the acoustic component assembly 1 is formed by embedding a metal coil spring 7 in a part of the bottom wall 5 of the elastomer holder and integrally molding the same. A part of the holder molded from the elastomer covers at least a part of the acoustic component, and a metal coil spring is integrally molded and arranged so as to contact an electrode part of the acoustic component.

に お い て In this example, an electret condenser microphone was used as the acoustic component. The holder for holding acoustic components molded of elastomer is colored by adding a vulcanizing agent RC-4 (trade name) and an inorganic powder pigment for coloring to SH-831U (trade name) manufactured by Toray Dow Corning Silicone Co., Ltd. A prepared formulation was prepared. The coil spring made of metal is made of a wire of Class B (SUS304WP-B) stipulated in JIS G4314 (stainless steel wire for spring) having a wire diameter of 0.07 mmφ and has a free length (length in a natural state) of 1.0 mm and is wound. A surface of a metal coil spring having an outer diameter of 0.4 mmφ, a winding direction: right-handed winding, and the number of windings: 8 times / 1 mm was prepared by applying a gold plating having a thickness of 0.15 μm to the surface. Next, the surface of the metal coil spring was subjected to a primer treatment to enhance the adhesiveness with the elastomer. The primer used was "Primer D" (trade name) manufactured by Toray Dow Corning Silicone Co., Ltd. ) For 2 hours. Next, a molding die for baking a metal coil spring and an elastomer to perform integral bonding molding is prepared, and primary vulcanization is performed at 170 ° C. for 10 minutes by a hot vulcanizing press using a press molding method. After a second vulcanization, a holder was obtained.

The obtained holder is as shown in FIG. 1 to FIG. 4, and the outer diameter is 6.8 mm in width (diameter) in FIG. 1, 2.85 mm in overall height, and the side wall 3 in FIG. Thickness: 0.3 mm, thickness of bottom wall 5: 0.25 mm, maximum diameter of projection 4: 0.7 mm, minimum diameter: 0.5 mm, projection height of projection 4: 0.5 mm, upper window The diameter of the inside (gap portion) of the edge constituting: 4.7 mm, the height of the projection on the acoustic component housing portion side of the bottom wall 5 on which the metal coil spring 7 in FIG. 4 is integrated: 50 μm, and the height of the metal coil spring 7 The protruding length on the side of the acoustic component storage section 6 was 50 μm, and the protruding length on the opposite side was 100 μm. The metal coil spring 7 was embedded in a part of the bottom wall 5 of the elastomer holder and was integrally molded. In addition, the components can be more easily and reliably mounted inside the portable communication terminal, the compression holding force can be reduced, and an electrically stable connection can be obtained.

FIG. 2 is a side view of the sound component holder according to the embodiment of the present invention. FIG. FIG. 3 is a sectional view taken along line II of FIG. 2. The enlarged view of the X part of FIG.

Explanation of reference numerals

Reference Signs List 1 acoustic component holder 2 edge forming upper window of holder 3 side wall of holder 4 protrusion 5 bottom wall of holder 6 acoustic component (for example, microphone) storage portion 7 metal coil springs 7a, 7b projecting portions of coil spring

Claims (4)

A holder for connecting acoustic components incorporated inside the main body of the mobile communication terminal,
A metal coil spring is embedded in a part of a molded product holding the acoustic component and integrally molded,
The holder for an acoustic component, wherein the holder covers at least a part of the acoustic component, and electrically connects to an electrode on a circuit board via the metal coil spring. The acoustic component holder according to claim 1, wherein at least both ends of the metal coil spring protrude from the holder surface. 3. The acoustic component holder according to claim 2, wherein at least both ends of the metal coil spring protrude from the holder surface by a length of 1 μm or more and 200 μm or less. The holder for an acoustic component according to claim 1, wherein the holder is an elastomer.

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