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JPH1175279

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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.
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[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]
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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
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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
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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]
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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]
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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
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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
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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.
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[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
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