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JP2000295687

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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 JP2000295687
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
directional microphones, and more particularly to a single / superdirective convertible dynamic
microphone.
[0002]
2. Description of the Related Art As an example of a conventional dynamic microphone, as shown
in FIG. 1, a housing 4 having a magnet 401 and a yoke 402, a washer 5 and an outer resin ring 6
provided with a connection plate 601 There is a microphone in which the rear lid 7, the voice
coil 2, the vibrating membrane 3, the protective cap 1 and the housing 8 which also serves as a
sound chamber are assembled in a predetermined order. A felt 703, a washer 704 and a nut 705
are provided between the back lid 7 and the housing 8. The rod 9 is for sound pressure
adjustment, and holds the housing 8 and the back lid 7 by the nut 705 through the through hole
802 provided in the housing 8.
[0003]
The conventional dynamic microphone is given unidirectionality by the slot 702. However, such
microphones are not suitable for use in lectures and theaters, and dynamic microphones that can
be converted to either single or superdirectivity according to multifunctional needs are desired.
03-05-2019
1
[0004]
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present
invention to improve the conventional directional dynamic microphone to provide a single and
super bi-directional mutually convertible dynamic microphone. Do.
[0005]
SUMMARY OF THE INVENTION A dynamic microphone according to the present invention
includes a breathable front wall which can introduce incident sound facing the front with the
direction toward the sound source forward, and the front wall The impervious rim extends
rearward from the rim of the rim, and the rim has a diameter slightly larger than that of the
smaller first rim and the first rim which are in steps. A protective cap is provided on the second
flange.
[0006]
Then, the first projecting edge portion of the projecting edge has the front face facing the front
wall and the back face facing rearward so that the incident sound can be vibrated back and forth
by receiving the incident sound. A vibrating membrane is attached airtightly by an annular
membrane seat.
[0007]
In addition, it has a terminal for extracting a pair of electric signals, and comprises a front coil
closer to the front than the terminal, and a rear coil closer to the rear, the front coil being fixed to
the back of the vibrating membrane, A voice coil that can be vibrated back and forth integrally
with the vibrating membrane is provided in its entirety.
[0008]
Further, the dynamic microphone according to the present invention comprises a disk-shaped
magnet disposed behind the above-mentioned vibrating film with a gap, and a cylindrical yoke
concentrically disposed with a slight gap therebetween. The front surface of the magnet faces the
back surface of the vibrating film, and the yoke extends rearward from the periphery of the
annular tip surface projecting forward from the surface of the magnet. A disk-like space is
defined by the plate surface and the upper inner peripheral surface of the yoke, and the rear coil
of the voice coil advances and retracts into the space by the vibration of the vibrating membrane,
and between the pair of terminals of the voice coil It comprises magnetic means adapted to
induce an electrical signal.
03-05-2019
2
[0009]
Further, the housing has a substantially cup shape, and the upper end edge thereof is fitted into
contact with the inner peripheral surface of the flange of the protective cap, and the housing
accommodates the yoke, the magnet, the diaphragm and the voice coil together inside thereof.
Have.
[0010]
Here, in the housing, a plurality of recessed grooves are formed in the outer peripheral surface of
the tip of the peripheral wall, and the inner peripheral surfaces of the first and second projecting
edge portions of the protective cap form a passage to face each other. A sound path is formed to
allow the back side of the vibrating membrane to communicate with the atmosphere.
In addition, a flexible tuning paper is wound around the tip outer peripheral surface portion of
the housing and the outer peripheral surface portion of the protective cap so as to cover the
above-mentioned passage, and unidirectionality is given.
[0011]
And the through-hole whose opening area is smaller than a plurality of the above-mentioned
sound paths is also drilled in the rear end peripheral wall portion of the above-mentioned
housing, and the adjustment ring by which a plurality of through-holes corresponding to those
through-holes were installed circumferentially Is slidably fitted on the outside.
Thereby, super directivity can be provided when the adjusting ring is rotated to a position where
the through hole and the through hole of the housing communicate with each other to introduce
a sound wave.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically
described based on the following examples, but the present invention is not limited to these
examples.
03-05-2019
3
[0013]
2 and 3 are an exploded perspective view showing the configuration of a dynamic microphone
according to a preferred embodiment of the present invention and a side sectional view after the
assembly.
2 and 3, the dynamic microphone comprises a protective cap 10 in which a nylon cloth 12 and a
sponge 11 are fitted, a vibrating membrane 30, a voice coil 20, and a housing 500 in which a
magnetic means 50 is installed. A sound adjusting plate 53 and the like are provided at upper
and lower portions thereof and a substantially cup-shaped sound chamber 60 screwed by a long
nut 54 and a sound pressure adjusting rod 63 through upper and lower buffer rings 61 and 62.
It is a configuration as held from
[0014]
In the above configuration, with the direction toward the sound source being the front, as shown
in FIG. 3, the protective cap 10 faces the front and is provided with a plurality of vent holes
through which incident sound can be introduced. The front wall 10A and the impervious rim 10B
extend rearward from the periphery of the front wall 10.
The flange 10B is formed of a first flange 13A near the front and a second flange which is
continuous with the first flange 13A.
The diameter of the first projecting edge 13A is slightly smaller than the diameter of the second
projecting edge 13B.
[0015]
The vibrating membrane 30, which is airtightly attached to the first flange 13A by the membrane
seat 40, can have its front face 30A in front of the cap 10 so that it can vibrate back and forth in
response to the incident sound. A slight gap is made to face the wall 10A, and the back surface
30B is made to face rearward.
03-05-2019
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[0016]
The voice coil 20 has terminals 20C, 20C for extracting a pair of electric signals.
The voice coil 20 is composed of a front coil 20A closer to the front than the terminals 20C and
20C and a rear coil 20B closer to the rear, and the front coil 20A is on the back surface 30B of
the diaphragm 30. It is fixed, and the whole can be vibrated back and forth integrally with the
vibrating membrane 30.
[0017]
The magnetic means 50 comprises a disk-shaped magnet 502 disposed spaced apart to the rear
of the vibrating film 30, and a cylindrical yoke 503 disposed concentrically with a slight gap
from the magnet. There is.
The plate surface 502A of the magnet 502 faces the front surface 30B of the diaphragm 30, and
the yoke 503 has an annular tip end surface 503A projecting further forward than the plate
surface 502A of the magnet 502. It extends backward from the peripheral edge.
The plate surface 502A of the magnet 502 and the upper inner circumferential surface 503B of
the yoke 503 define a disc-like space facing the back surface 30B of the diaphragm 30. Then, the
rear coil 20B of the voice coil 20 moves back and forth into the space by the vibration of the
vibrating membrane 30, and an electric signal can be induced between the pair of terminals 20C
and 20C of the voice coil 20.
[0018]
Further, the housing 500 is substantially cup-shaped, and the upper end edge thereof is fitted in
contact with the inner peripheral surface of the projecting edge 10B of the protective cap 10, and
the magnet 502 and the yoke 503 are contained therein. The diaphragm 30 and the voice coil 20
are accommodated together.
[0019]
03-05-2019
5
Furthermore, in the housing 500, a plurality of recessed grooves 56 are formed in the tip outer
peripheral surface 513A of the peripheral wall 513, and a passage is formed with the inner
peripheral surfaces of the first and second projecting edge portions 13A and 13B of the
protective cap 10. A sound path is formed, which faces each other and causes the back surface
30B side of the vibrating membrane 30 to communicate with the atmosphere through the inner
circumferential surface side of the membrane seat 40 by this passage.
A flexible tone control paper 55 is wound around the tip outer peripheral surface portion 513A
of the housing 500 and the outer peripheral surface portion of the protective cap 10 so as to
cover the opening of the passage to prevent dust from entering. The peripheral wall 513 is
provided with grooves 57 in which two connection plates 571 are fitted. The contacts 573, 573
on the front side of the cap 10 are connected to the terminals 20C, 20C of the coil 20 on the
plates 571, 571, and the connection plates 64 on the lower surface of the sound chamber on the
contacts 572, 572 on the rear side. It is connected to the lead wires 65, 65 from.
[0020]
Further, through holes 58, ... having a smaller opening area than the plurality of sound paths are
also formed in the rear end peripheral wall portion 513B of the housing 500, and a plurality of
through holes corresponding to the through holes 58, ... An adjustment ring 59, around which
holes 591,... Are circumferentially fitted, is slidably and rotatably fitted.
[0021]
FIG. 5 is an enlarged sectional view of only the main part adjustment ring 59 of line 6-6 in FIG.
In the present invention configured as described above, when the plurality of through holes
591,... And the plurality of through holes 58 of the housing 500 are communicated by rotating
the adjustment ring 59, It is estimated that sound waves are introduced and both sound
pressures Pe and Pi are generated inside the microphone as shown in FIG. 6 through the above
sound path, and the phase difference causes super directivity as shown in FIG. An effect can be
given. On the other hand, the adjusting ring 59 is connected to the plurality of through holes
591. . . Are the plurality of through holes 58,. . . When it is pivoted to the position to block, it has
unidirectionality like the conventional microphone.
03-05-2019
6
[0022]
As described above, according to the configuration of the present invention, it is possible to
provide a single and super bi-directional, mutually convertible dynamic microphone.
03-05-2019
7
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