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JPH071694

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DESCRIPTION JPH071694
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a microphone unit mainly used for a headset.
[0002]
2. Description of the Related Art The structure of a microphone unit used for a headset or the like
will be described with reference to FIG. A yoke 1 is in the form of a cup having a stepped portion
in part as illustrated. A disc-shaped magnet 2 is fixed to the central bottom of the yoke 1 so as
not to move by adhesion or the like, and a pole piece 3 having an outer diameter larger than that
of the magnet 2 is adhered to the upper surface thereof. It is fixed so as not to move. A gap 4 of a
predetermined size is formed between the outer periphery of the pole piece 3 and the yoke 1.
[0003]
An annular spacer 5 is mounted on the inner side near the opening of the yoke 1 and the outer
peripheral portion of the diaphragm 6 is attached to the upper surface of the spacer 5. A voice
coil 7 is attached to the back of the diaphragm 6 so as to vibrate so as not to be in contact in the
gap 4 described above.
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[0004]
The outer peripheral portion of the protector 8 is fixed to the outer peripheral portion of the
diaphragm 6, and the opening of the yoke 1 is covered from the outside of the diaphragm 6. The
protector 8 is provided with a plurality of holes 9 to allow sound waves 10 from a sound source
(not shown) located in front of the protector 8 to pass therethrough.
[0005]
A plurality of small holes 11 are formed at equal intervals in the vicinity of the opening of the
yoke 1, and a damper material 12 is attached to the hole 11 from the outside. The damper
material 12 is made of, for example, a thin felt or cloth, and the sound wave 10 which has wound
around the rear of the yoke 1 enters the inside of the yoke 1 from the hole 11 and acts on the
back of the diaphragm 6. It is intended to provide appropriate resistance and to add directivity
by this.
[0006]
In this microphone unit having such a configuration, the sound wave 10 from the sound source
enters the inside of the protector 8 from the hole 9 of the protector 8 to vibrate the diaphragm 6.
When the diaphragm 6 vibrates, the voice coil 7 vibrates in the gap 4 forming the magnetic
circuit, so that a current according to the vibration is induced in the voice coil 7 here. This is the
audio current. Although illustration of a lead wire or the like for taking out to the outside is
omitted, the voice current is led to an amplifier or the like by this lead wire.
[0007]
The plurality of holes 11 formed at equal intervals in the vicinity of the opening of the yoke 1 are
small, so that the damper material 12 to be attached to the holes 11 is formed. Will also be small.
In the work of sticking the damper material 12 to the outside of the hole 11, an adhesive is
applied to the outer peripheral portion of the damper material 12 cut to a diameter slightly
larger than that of the hole 11, and pressed while aligning the hole 11; It will wait for the
adhesive to dry. When the portion to which the adhesive material is applied blocks the hole 11,
the effect of directivity addition is lost, so that the position alignment between the hole 11 and
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the damper material 12 is sufficiently considered at the time of adhesion.
[0008]
In this case, since the outer diameter of the damper material 12 is small and the adhesive is
applied only to the outer peripheral portion, there is a problem that the workability is extremely
bad. And when the sticking work can not be performed uniformly, the variation in the directivity
characteristic also occurs. The present invention has been made in view of this point, and an
object of the present invention is to provide a microphone unit whose manufacturing workability
is remarkably improved by fundamentally changing the structure of the bonding portion of the
damper material.
[0009]
[Means for Solving the Problems] As means for solving the above problems, the present invention
supports a magnet, a pole piece, a diaphragm and the like, and a cup-shaped yoke having a
protector attached to its opening. The microphone unit has a hole through which the sound wave
passes in a part of the yoke, and a hole also in a part of the protector, and a damper material is
attached to the protector surface with the yoke side serving as a surface directly receiving the
sound wave. A phase shift circuit for adding directivity is provided.
[0010]
In this way, the portion to which the damper material is to be attached can be configured as a flat
portion with a sufficient area, and therefore, the attachment operation of the damper material
will be significantly improved.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to FIG. 1, and the same members as those in
FIG.
In the present invention, the direction is reversed from that shown in FIG. 1, and the yoke 1 is
directed to the sound source (not shown) side.
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The sound wave 10 is guided to the diaphragm 6 from the hole 11 of the yoke 1. The holes 11
are the ones in FIG. 2 to which the damper material 12 is attached.
[0012]
A hole 9 is also provided in the protector 8, and a damper material 12 is attached to the surface
of the hole 9 to form a phase shift circuit for adding directivity. Since this protector 8 is located
at the back of the microphone unit, it is not necessary to form an arc like the one shown in FIG. 2
in consideration of the appearance, so that it is flat and attachment of the damper material 12 is
easy. To be able to The damper material 12 is also made sufficiently large so that the bonding
operation can be easily performed. As the damper material 12, one with a double face can also be
used.
[0013]
In the microphone unit thus configured, when there is a sound source at the upper side of the
figure, the sound wave 10 from there enters the inside of the yoke 1 from the hole 11 of the
yoke 1 and vibrates the diaphragm 6. The voice current is induced in the voice coil 7 by the
vibration of the diaphragm 6, which is the same as that shown in FIG.
[0014]
Since the present invention is a microphone unit configured as described above, the damper
material can be easily attached. That is, since the damper material can be made sufficiently large,
the bonding operation can be easily performed. As a damper material, one with double face can
also be used, so workability and stability
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