Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPH1175279 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a small microphone assembly suitable for use embedded in the body of a small communication device represented by a portable telephone and a portable wireless device. [0002] 2. Description of the Related Art At present, small-sized portable communication devices are mainly developed for smaller and lighter products, and the microphone element body used as one of the components is also miniaturized. Among them, in order to mount the small microphone, in order to connect the electrode on the small microphone side and the electrode on the circuit board in the small communication device main body, the thin lead wire is soldered and then the rubber molded product is used as a waterproof seal. A small microphone is incorporated in the small communication device. [0003] However, the method of assembling a small microphone for soldering the above-mentioned thin lead wire is stable in quality because the soldering operation is fine and the automation of the operation is difficult and manual. There is a problem that the mounting space can not be narrowed because the lead wire is disposed. 01-05-2019 1 [0004] In order to solve the problems of the prior art, the present invention uses an anisotropically conductive rubber connector for a mounting method which eliminates the soldering operation, simplifies the assembly operation, and makes the mounting space extremely small. The purpose is to provide a microphone assembly. [0005] In order to achieve the above object, the small microphone assembly using the anisotropic conductive rubber connector according to the present invention is formed by covering the small microphone with a rubber molded product for anti-vibration and conducting electricity. An anisotropically conductive rubber connector (hereinafter also referred to as "zebra type anisotropically conductive rubber connector") in which a layer and an electrical insulating layer are laminated is held so as to be in surface contact with the electrode portion of the small microphone; It is characterized in that a vibration-proof rubber molded product covering the same and the anisotropic conductive rubber connector are integrated. According to this configuration, the small-sized microphone assembly of the present invention can be assembled simply by pressure-contacting the electrode portion on the circuit board, and the soldering operation and the operation of arranging the lead wire can be omitted. Also, the mounting space can be reduced. [0006] In the above-mentioned configuration, it is preferable that the anisotropically conductive rubber connector is in such a form that one conductive layer does not contact simultaneously with two or more electrodes of the small microphone. If the same conductive layer contacts two or more electrodes at the same time, a short circuit between the electrodes will occur and the small microphone will not operate properly. [0007] 01-05-2019 2 In the said structure, it is preferable that the rubber molded article for anti-vibration is made of silicone rubber. This is because the durability is high and the vibration isolation is excellent. [0008] Further, in the above construction, as a rubber member of the anisotropically conductive rubber connector, polybutadiene, natural rubber, polyisoprene, styrene-butadiene copolymer rubber (SBR), butadiene-acrylonitrile copolymer rubber (NBR), ethylene- Propylene-non-conjugated diene copolymer (EPDM), ethylene-propylene copolymer (EPM), polyurethane polyester rubber, chloroprene rubber, epichlorohydrin rubber, silicone rubber, etc. may be mentioned, but silicone rubber is preferred due to its electrical characteristics and weather resistance. Most preferred. [0009] In the above configuration, the conductive layer of the zebra type anisotropic conductive rubber connector is a metal powder containing platinum, gold, silver, nickel, cobalt, copper, tin, aluminum, palladium with respect to 100 parts by weight of the rubber component. 1 to 400 parts by weight of at least one fine powder selected from an alloy fine powder containing a solder, a conductive fine powder metal-coated on an organic polymer fine powder, and a conductive fine powder metal-coated on an inorganic fine powder 10 to 150 parts by weight, particularly 40 to 100 parts by weight of conductive carbon powder added to 100 to 300 parts by weight of the conductive rubber or 100 parts by weight of the rubber component It is preferable that it is formed of rubber. When the content of the fine powder or carbon black is less than the above range, good conductivity can not be obtained. On the other hand, when the amount of the fine powder or carbon black is more than the above range, not only the conductivity is not much improved but also the moldability and the compression elasticity of the rubber connector are inhibited. [0010] Further, in the above configuration, it is preferable that the zebra type anisotropically conductive rubber connector has compressive elasticity and can be assembled by surface pressure welding to the electrode portion on the circuit board. Since the rubber connector has compressive elasticity, when the small microphone assembly is incorporated into a small communication device or the like, the rubber connector is compressed between the electrode of the small 01-05-2019 3 microphone and the electrode of the circuit board, and is elastically deformed appropriately. This ensures that the rubber connector is in surface contact with both electrode surfaces. As a result, the reliability of the electrical connection is improved. Also, the vibration resistance of the small microphone is improved by elastically holding the small microphone together with the rubber molded product for vibration isolation. [0011] The compression elasticity of the rubber portion at this time is preferably in the range of 30 to 80 in method A of JIS K6301. If the compression elasticity is smaller than the above range, the elastic deformation of the rubber connector becomes large, pressure-sensitive conductivity occurs, and the electrical connection resistance value with the circuit board electrode becomes unstable. In addition, if the compression elasticity is larger than the above range, the elastic deformation of the rubber connector is small, so that the reliability of the electrical connection with the circuit board electrode may be reduced. In addition, the measurement of the compression elasticity described in A method of JISK6301 is as follows. A sample prepares the test piece of the size defined in JIS K6301, and uses it as a sample. The measuring tool uses an Ashaped spring-type hardness tester conforming to JIS K6301. In addition, A method of JISK6301 conforms to A type of ASTM D2240. [0012] Although the small microphone assembly of the present invention is used for various applications, it is preferably incorporated into the body of a small portable communication device such as a portable telephone. The small-sized microphone assembly of the present invention can reduce the mounting space by eliminating the soldering operation using the lead wire, and the small-sized microphone main body can be pressure-held by the rubber molded product for antivibration and the rubber connector. By doing so, the reliability and vibration resistance of the electrical connection are simultaneously improved, so that the commercial value of the smallsized portable communication device, which is particularly required to be reduced in size and improved in reliability, can be improved. [0013] In the small microphone assembly using the zebra type anisotropic conductive rubber connector 01-05-2019 4 of the above configuration, the zebra type anisotropic conductive rubber connector includes the electrode surface of the small microphone and the electrode surface on the circuit board in the small communication device main body. The light connection is lightly compressed between the two to provide reliable electrical connection. In addition, the zebra-type anisotropically conductive rubber connector is electrically conductive only in the thickness direction of the rubber connector, and insulates in the laminating direction of the zebra portion (a portion in which the conductive layer and the electrical insulating layer are mutually stacked) In addition to having conductivity, by ensuring that the conductive layer of the zebra part does not contact two or more electrodes at the same time, reliable electrical connection is obtained, and moreover, alignment of complicated rubber connectors is required. do not do. Moreover, since it is possible to connect a plurality of circuits with one rubber connector, it is not necessary to connect circuits for soldering lead wires, and not only the mounting space can be reduced, but also troublesome mounting work can be omitted. [0014] In addition, a rubber molded product for vibration control called a bush covers all except the electrode surface and the sound collecting portion of the small microphone airtightly, and at the same time holds and fixes the zebra type anisotropically conductive rubber connector in surface contact with the electrodes. It is possible to integrate a small microphone and a zebra type anisotropically conductive rubber connector by having a shape that can be As a result, it becomes possible to mount the small microphone only by incorporating the small microphone assembly using the zebra type anisotropic conductive rubber connector into a predetermined place in the small communication device, and the work efficiency in the assembly operation is greatly improved. It can be done. [0015] In addition, by using a rubber molded product for vibration reduction called a bush, the vibration resistance reliability of the small microphone as well as the microphone electrode surface in the small communication device in which the small microphone assembly is incorporated Since the surface pressure between the circuit board electrode surfaces is held under constant pressure by the rubber elasticity of the bush, a synergistic effect is achieved that a highly reliable electrical connection can be made. [0016] 01-05-2019 5 EXAMPLES The present invention will be described more specifically by the following examples. However, the present invention is not limited to the following examples. [0017] In one embodiment shown in FIG. 1A (plan view), FIG. 1B (I-I cross section in FIG. 1A) and FIG. 1C (bottom view), the small microphone assembly 1 is different from the small condenser microphone body 11 and the zebra type It is composed of a nonconductive rubber connector 13 and a rubber molded product 12 for vibration reduction called a bush. The size of the small microphone assembly is 6 to 10 mm in diameter and 2 to 5 mm in height. The thickness of the rubber molded article 12 for vibration damping is about 0.9 mm. The thickness of the zebra type anisotropically conductive rubber connector 13 is about 1.0 mm. [0018] As apparent from FIG. 1C (bottom view), the zebra type anisotropically conductive rubber connector 13 is processed into a shape such that the conductive layer 14 of the zebra portion does not contact the two electrodes 15 simultaneously. [0019] FIGS. 2, 3 and 4 (bottom views) show another embodiment, in which the conductive layers 24, 34 and 44 of the zebra part of the zebra-shaped anisotropic conductive rubber connectors 23, 33 and 43 are simultaneously formed. Each of the electrodes 25, 35, 45 is processed so as not to come in contact with it. Reference numerals 2, 3 and 4 denote small microphone assemblies, reference numerals 21, 31 and 41 denote small condenser / microphone bodies, and reference numerals 22, 32 and 42 denote rubber molded products for vibration isolation. . [0020] 01-05-2019 6 FIG. 5 (perspective view) is a representative of the zebra type anisotropically conductive rubber connector 53 in which the conductive layer 54 made of conductive silicone rubber and the electrical insulating layer 56 made of insulating silicone rubber used in the embodiment are alternately laminated. The zebra-shaped anisotropic conductive rubber connector Fujipoly connector Z series using conductive silicone rubber compounded with carbon fine particles as a conductive member. ) Or zebra-type anisotropic conductive rubber connector Fujipoly connector S-Z series (made by Fuji Highpolymer Co., Ltd.) using conductive silicone rubber compounded with metal fine powder as conductive member I can do it. It is preferable that the zebra type anisotropically conductive rubber connectors 13, 23, 33, 43 have a thickness of about 1 to 2 mm and a lamination pitch of zebra parts of about 0.05 to 0.50 mm. [0021] Also, as a rubber molded article for vibration reduction called a bush, for example, a zebrashaped anisotropic conductive rubber connector which airtightly covers all except the electrode surface and the sound collecting portion of a small microphone and also makes surface contact with the electrode It is possible to use a silicone rubber molded product "Fujipoly M mold 4 EC bush" (manufactured by Fuji Highpolymer Co., Ltd.) having a shape capable of being held and fixed. [0022] After the rubber molded product for anti-vibration is mounted on the small microphone, the rubber connector is fitted to the rubber molded product on the electrode side of the small microphone. As a result, the rubber connector is held and fixed by the elastic force of the rubber molded article for anti-vibration in a state where the rubber connector is in surface contact with the electrode portion of the small microphone. Thus, a small microphone assembly in which a small microphone, a rubber molded product for vibration isolation and a rubber connector are integrated is obtained. [0023] In order to mount this small microphone assembly, the mounting operation is completed only by incorporating the zebra type anisotropically conductive rubber connector into the small communication device main body so as to be face-contacted to the electrode portion on the circuit board. The work efficiency can be greatly improved, the mounting space can be 01-05-2019 7 minimized, and reliable electrical connection is possible. [0024] Examples of the rubber part material of the zebra type anisotropically conductive rubber connector include polybutadiene, natural rubber, polyisopyrene, SBR, NBR, EPDM, EPM, polyurethane polyester rubber, chloroprene rubber, epichlorohydrin rubber and silicone rubber. Silicone rubber is most preferable in terms of electrical insulation and weather resistance. [0025] In addition, the conductive layer of the zebra type anisotropically conductive rubber connector is an alloy containing solder, a metal powder containing platinum, gold, silver, nickel, cobalt, copper, tin, aluminum, palladium with respect to 100 parts by weight of rubber. At least one fine powder selected from fine powder, conductive fine powder obtained by metal coating on fine powder of organic polymer, and conductive fine powder obtained by metal coating on inorganic fine powder is added and blended in the range of 1 to 400 parts by weight It is preferable that the conductive rubber or the conductive rubber is added with 10 to 150 parts by weight of carbon fine powder with respect to 100 parts by weight of the rubber. [0026] As described above, according to the compact microphone assembly using the zebra type anisotropic conductive rubber connector of the present invention, the zebra type anisotropic conductive rubber connector has the electrode surface of the compact microphone and the compact communication device main body. A highly reliable electrical connection can be achieved only by light surface compression with the electrode surface on the inner circuit board. In addition, the zebra type anisotropically conductive rubber connector has anisotropic conductivity that conducts only in the thickness direction of the rubber connector and insulates in the stacking direction of the zebra portion, and at the same time, two or more conductive layers of the zebra portion are simultaneously A configuration which does not contact the electrodes of the sensor provides a reliable electrical connection and does not require complicated rubber connector alignment. Moreover, since it is possible to connect a plurality of circuits with one rubber connector, it is not necessary to connect circuits for soldering lead wires, and not only the mounting space can be 01-05-2019 8 reduced, but also troublesome mounting work can be omitted. [0027] In addition, a rubber molded product for vibration control called a bush covers all except the electrode surface and the sound collecting portion of the small microphone airtightly, and at the same time holds and fixes the zebra type anisotropically conductive rubber connector in surface contact with the electrodes. It is possible to integrate a small microphone and a zebra type anisotropically conductive rubber connector by having a shape that can be As a result, it becomes possible to mount the small microphone only by incorporating the small microphone assembly using the zebra type anisotropic conductive rubber connector into a predetermined place in the small communication device, and the work efficiency in the assembly operation is greatly improved It can be done. [0028] In addition, by using a rubber molded product for vibration reduction called a bush, the vibration resistance reliability of the small microphone as well as the microphone electrode surface in the small communication device in which the small microphone assembly is incorporated Since the surface pressure between the circuit board electrode surfaces is held under constant pressure by the rubber elasticity of the bush, a synergistic effect is achieved that a highly reliable electrical connection can be made. [0029] Brief description of the drawings [0030] FIG. 1A is a plan view of a small microphone assembly according to an embodiment of the present invention, B is a cross-sectional view as viewed from the direction of the arrow II in FIG. 1A, and C is a bottom view. [0031] FIG. 2 shows a bottom view of a miniature microphone assembly according to another embodiment of the present invention. 01-05-2019 9 [0032] FIG. 3 shows a bottom view of a miniature microphone assembly according to another embodiment of the present invention. [0033] Figure 4 shows a bottom view of a miniature microphone assembly according to another embodiment of the present invention. [0034] FIG. 5 shows a perspective view of one embodiment of a zebra-type anisotropically conductive rubber connector used in the present invention. [0035] Explanation of sign [0036] 1, 2, 3, 4 Small Microphone Assemblies 11, 21, 31, 41 Small Condenser-Microphone Body 12, 22, 32, 42 Rubber molded parts for vibration isolation 13, 23, 33, 43 Zebra type anisotropic conductivity Rubber connectors 14, 24, 34, 44 Conductive layers 15, 25, 35, 45 of the zebra part Electrodes 53 Zebra-shaped anisotropic conductive rubber connectors 54 Conductive layers 56 electrically insulating layer 01-05-2019 10
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