JP2000270399

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DESCRIPTION JP2000270399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and in particular, in a terminal having a coil spring, the end of the coil
spring is mounted by improving the structure of the coil spring. The present invention relates to
a device which is prevented from being caught on a substrate or the like, thereby providing a
stable mounting state and a stable function.
[0002]
2. Description of the Related Art A conventional electroacoustic transducer is constructed, for
example, as shown in FIG. First, there is a case 1, which is composed of a top plate portion 3 and
a cylindrical portion 5. A sound release hole 7 is formed at the center position of the top plate
portion 3 and resonance is made inside. A space 8 is formed. In the case 1, a pole piece 14
having an iron core 13 attached at the center position of the substrate 9 and the base 11 is
attached. A coil 15 is disposed on the outer peripheral side of the iron core 13 in a wound state.
[0003]
A support ring 17 is internally provided on the outer peripheral side of the coil 15 and on the
inner peripheral side of the cylindrical portion 5 of the case 1. A magnet 19 is disposed on the
inner peripheral side of the support ring 17.
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[0004]
A stepped portion 21 is formed on the support ring 17, and a diaphragm 23 is placed on the
stepped portion 21. The diaphragm 23 is composed of an elastic plate 25 and a magnetic piece
27 as an additional mass attached to a central position of the elastic plate 25. The pole piece 14,
the coil 15, the magnet 19 and the diaphragm 23 constitute an electroacoustic transducer. In the
figure, reference numeral 28 denotes an adhesive.
[0005]
Further, a pair of terminals 29 and 31 are attached to the lower side of the substrate 9 and in the
inner space of the case 1, and the pair of terminals 29 and 31 are constituted by coil springs. On
the other hand, both unshown coil ends of the coil 15 already described are electrically
connected to the pair of terminals 29 and 31 via the substrate 9. The pair of terminals 29, 31
and the skirt portion 5a of the cylindrical portion 5 of the case 1 and the like constitute a spring
terminal portion. The said terminals 29 and 31 are expanded and shown in FIG.11 and FIG.12.
[0006]
The electro-acoustic transducer having the above-described configuration operates as follows.
That is, the diaphragm 23 is in a state of being attracted by the magnet 19 and thereby set in a
state of having a certain polarity. In that state, when current is supplied to the coil 15 through
the terminals 29 and 31, the iron core 13 is converted to an electromagnet. As a result, a
magnetic field is generated at the tip. At that time, when the magnetic pole by the coil 15
generated in the iron core 13 and the magnetic pole by the magnet 19 of the diaphragm 23 have
different polarities, the diaphragm 23 is attracted to the iron core 13.
[0007]
On the other hand, when the magnetic pole by the coil 15 generated in the iron core 13 and the
magnetic pole by the magnet 19 of the diaphragm 23 have the same polarity, the diaphragm 23
repels the iron core 13. Therefore, by causing the current to flow intermittently in either
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direction, the diaphragm 23 repeats the above-described operation, and eventually the
diaphragm 23 vibrates at a predetermined frequency to generate a sound.
[0008]
By the way, the electroacoustic transducer which performs said structure and effect ¦ action will
be internally equipped, for example in the housing of a mobile telephone. The situation is shown
in FIG. First, there is a housing 33 of a mobile phone, and the electro-acoustic transducer already
described is fixed or held by bonding, press-fitting or the like in a hole 35 formed in the housing
33. On the other hand, there is a substrate 37 of a mobile phone, and circuits 39 and 41 are
provided on the substrate 37. The electroacoustic transducer is mounted on the substrate 37 by
mounting the housing 33 on which the electroacoustic transducer is fixed or held to the
substrate 37.
[0009]
At this time, the terminals 29, 31 formed of coil springs are brought into pressure contact with
the circuits 39, 41. At this time, the terminals 29, 31 are compressed from the free height (L1) to
the compressed height (L2) shown in FIG. 9, and the elastic recovery force generated at that time
causes the terminals 29, 31 to The circuit 39, 41 is pressed against, thereby obtaining a secure
electrical connection. The compressed height (L2) is a height slightly larger than the contact
height obtained by compressing the terminals 29, 31 until the respective windings adhere.
[0010]
SUMMARY OF THE INVENTION The above-described conventional arrangement has the
following problems. As described above, when the electro-acoustic transducer is mounted on the
substrate 37, first, the electro-acoustic transducer is fixed to or held in the housing 33 by
adhesion, press fitting or the like by manual insertion. At this time, a rubber glove is usually
fitted and inserted so that the terminal side of the electroacoustic transducer is pressed with a
finger so that dust, hand marks and the like do not adhere to the terminals 29 and 31. At that
time, when the terminals 29, 31 are pushed with the finger, the glove is caught on the end 29a,
31a provided with the edge portions of the terminals 29, 31 and the inserted electroacoustic
transducer is detached from the housing 33 simultaneously with releasing the finger. It may be
mounted in an inclined state. If the terminals 29 and 31 are incorporated into the substrate 37
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such that the terminals 29 and 31 are in pressure contact in such a state, there is a possibility
that a stable function can not be provided or the electroacoustic transducer may be damaged.
When the electroacoustic transducer is incorporated into the substrate 37 with the
electroacoustic transducer normally fixed or held in the housing 33, the terminals 29, 31 are
pressed to an arbitrary position of the substrate 37, and the whole is slightly slid from that
position. Work is performed while being installed at a predetermined position. Also in this case, if
the ends 29a and 31a provided with the edge portions of the terminals 29 and 31 are caught by
the circuits 39 and 41 etc on the substrate 37 side, the terminals 29 and 31 may be mounted in
an inclined state. is there. In such a case, the contact resistance of the terminals 29 and 31 to the
circuits 392 and 41 may become unstable or conduction failure may occur, and a stable function
can not be provided. The work efficiency may be reduced because there is a risk that the work
piece may be damaged if it is excessively deformed.
[0011]
The present invention has been made based on these points, and the objective of the present
invention is to prevent the end of the terminal from being stuck to the substrate, glove, etc. when
mounted on the housing or substrate of various devices. It is an object of the present invention to
provide an electroacoustic transducer which makes it possible to obtain stable mounting
conditions and stable functions.
[0012]
In order to achieve the above object, in the electroacoustic transducer according to claim 1 of the
present invention, the terminal is constituted by a coil spring, and the terminal is in pressure
contact with the substrates of various devices. In the electro-acoustic transducer to be mounted
according to the present invention, an end on the substrate contact side of the coil spring is
separated from a contact surface on the substrate contact side of the coil spring.
The electro-acoustic transducer according to claim 2 is characterized in that in the electroacoustic transducer according to claim 1, the end on the substrate contact side of the coil spring
is bent to the side opposite to the contact surface. . The electro-acoustic transducer according to
claim 3 is characterized in that in the electro-acoustic transducer according to claim 1, the end
on the substrate contact side of the coil spring is bent to the side opposite to the contact side and
inward. It is. In the electro-acoustic transducer according to the fourth aspect of the present
invention, the terminal is constituted by a coil spring, and the electro-acoustic transducer is
mounted in a state in which the terminal is pressed against a substrate of various devices. It is
characterized in that the side end is bent inward. In the electro-acoustic transducer according to
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the fifth aspect of the present invention, the terminal is constituted by a coil spring, and the
electro-acoustic transducer is mounted in a state in which the terminal is pressed against a
substrate of various devices. It is characterized in that the edge at the side end is removed. An
electro-acoustic transducer according to claim 6 is characterized in that, in the electro-acoustic
transducer according to claim 5, the end of the coil spring on the substrate contact side is
spherical or substantially spherical.
[0013]
That is, in the case of the electroacoustic transducer according to the present invention, the
substrate contact side end of the coil spring is caught on the substrate or the globe by separating
the substrate contact side end of the coil spring from the substrate contact side contact surface.
It is something that prevents something like At that time, the end on the substrate contact side of
the coil spring is bent toward the opposite contact surface side, the end on the substrate contact
side of the coil spring is bent inwardly, or the end on the substrate contact side of the coil spring
is reversed. It is conceivable to bend the contact surface side toward the inside. In addition, by
removing the edge portion at the end of the coil spring on the substrate contact side, it is
possible to prevent the substrate side and the glove from being stuck. At that time, it is
conceivable to process the end on the substrate contact side of the coil spring into a spherical or
substantially spherical shape.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present
invention will be described below with reference to FIGS. 1 and 2. FIG. The configuration of the
electroacoustic transducer other than the terminal is the same as that of the prior art, and thus
the description thereof is omitted. The terminals 29, 31 are configured as shown in FIG. 1 and
FIG. That is, the ends 29a, 31a on the substrate contact side of the terminals 29, 31 are bent in
the direction opposite to the contact surface and toward the inner peripheral side. As a result, the
ends 29a, 31a are separated from the contact surface with the substrate, the glove or the like.
[0015]
According to the present embodiment, the following effects can be achieved. First, when the
electroacoustic transducer is mounted on the substrate of the device, the ends 29a and 31a on
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the substrate contact side of the terminal 29 can be prevented from being caught by a circuit or
the like on the substrate. It is possible to eliminate things that would otherwise be implemented.
Thereby, stable mounting state and stable function can be provided. In addition, there is no
possibility of inadvertently damaging the circuit or the like on the substrate. Furthermore, when
using a glove to mount on the housing while pressing the terminals 29, 31 with a finger, the ends
29a, 31a of the terminals 29, 31 on the substrate contact side can be prevented from being
caught by the glove. It is possible to prevent the electroacoustic transducer from being detached
from the housing or being inserted at an angle.
[0016]
Next, a second embodiment of the present invention will be described with reference to FIGS. 3
and 4. In the case of the second embodiment, the ends 29a and 31a on the substrate contact side
of the terminals 29 and 31 are bent in the direction opposite to the contact surface. Even with
such a configuration, substantially the same effect as that of the first embodiment can be
obtained.
[0017]
Next, a third embodiment of the present invention will be described with reference to FIG. 5 and
FIG. In the case of the third embodiment, the ends 29a, 31a on the substrate contact side of the
terminals 29, 31 are bent toward the inner peripheral side. Also in this case, substantially the
same effects as those of the first and second embodiments can be obtained. That is, when the
electroacoustic transducer is mounted, even if it may be caught on a circuit or the like on the
substrate, since the ends 29a and 31a are bent inward, that portion is pushed back to the noncontact surface side. As a result, the hooking of the circuit on the substrate is eliminated.
[0018]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 7
and 8. In the case of the fourth embodiment, the end 29a, 31a on the substrate contact side of
the terminal 29, 31 is, for example, formed into a spherical or substantially spherical shape by
laser processing to eliminate the edge portion. Thus, by eliminating the edge portions of the ends
29a and 31a of the terminals 29 and 31, it is possible to eliminate the hooking, and substantially
the same effect as in the case of the first to third embodiments can be exhibited. .
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[0019]
The present invention is not limited to the first to fourth embodiments. The point is that the end
on the substrate contact side of the terminal is separated from the contact surface, bent to the
inner peripheral side of the coil spring, or the edge portion of the end is eliminated to prevent the
circuit or glove on the substrate from being caught. I wish I could.
[0020]
As described above, according to the electro-acoustic transducer of the present invention, it is
possible to prevent the end on the substrate contact side of the terminal consisting of a coil
spring from being caught on the substrate, the glove, etc. It became possible to implement in the
normal state. Thereby, stable functions can be obtained.
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