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DESCRIPTION JP3183071

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DESCRIPTION JP3183071
Abstract: The present invention provides a headphone driver having improved sound circuit
characteristics, ensuring dip-free characteristics, and good sound quality. A headphone driver (1)
has a recess formed at the center of a substantially disk-like driver frame (3), and a magnetic
circuit consisting of a yoke (6), a magnet (7) and a pole piece (8) is mounted in the recess. Of the
peripheral flange portion 9 of the driver frame 3 and the distance dimension L1 between the
attachment position P1 of the disk shaped diaphragm 2 to the driver frame 3 and the innermost
side surface P2 of the driver frame 3. The space L2 is configured to be a half or more of the
distance dimension L2 between the outer edge P3 and the innermost surface P2 of the driver
frame 3. With the above configuration, a large air cavity 4 is secured at the position of the gap
dimension L1. Since the air stored in the air cavity 4 communicates with the outside air through
the acoustic hole 5, the cooperative action of the air cavity 4 and the acoustic hole 5 is
completed, and the resonance sound of the disk-shaped diaphragm 2 is It will not appear as a
dip. [Selected figure] Figure 1
Headphone driver
[0001]
The present invention relates to a headphone driver, and more specifically to a headphone whose
performance is improved as an acoustic circuit characteristic is improved and a dip-free
characteristic is secured as a characteristic of frequency response (anti-resonance sound) to
obtain excellent sound quality. It is about a driver.
[0002]
12-04-2019
1
Headphones have the added inconvenience of having to wear a headband on the head etc. On the
other hand, they have the advantage of being less affected by the room than speakers, or having
relatively little inconvenience to others, so There are good conditions to watch carefully.
In particular, it is designed as an acoustic device in that it is not necessary to be affected by the
room, because it is freed from the problem that setting and tuning are bothersome and in many
cases the developed intention is not accurately reproduced. It is easy to convey the intention
directly to the user, and the user also has the merit of being able to directly perceive and judge it.
[0003]
Although this headphone is equipped with a driver incorporating a driver unit and a disk-like
diaphragm, the conventional driver has a longitudinal sectional structure as shown in FIG.
[0004]
Utility Model Registration No. 3147408 Japanese Utility Model Application Publication No. 742300 Japanese Utility Model Application Publication No. 10-51892
[0005]
As shown in Patent Documents 1 to 3, the conventional driver 1 has an extremely narrow space
dimension L1 between the mounting position P1 of the disk-shaped diaphragm 2 on the driver
frame 3 and the innermost side P2 of the driver frame 3 Almost no air cavity 4 was secured at
the interval position.
The air cavity 4 means "Air Cavity" and is originally for storing air in that place, and the air
stored in the air cavity 4 is communicated with the outside air through the acoustic hole 5. ing.
[0006]
In the conventional driver 1, since the air cavity 4 is formed with a very small volume and the
cooperative action with the acoustic hole 5 is incomplete, the resonance sound of the disk-shaped
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2
diaphragm 2 appears as a dip It was
This dip (Dip) is indicated as sound pressure (db) on the frequency characteristic as measured by
the frequency measuring instrument. It has been found that preventing or minimizing the
occurrence of the dip improves the sound listening effect. Therefore, when the conventional
driver 1 is adopted, a dip occurs particularly in the sound quality of the midrange, and there is a
problem that a good sound quality can not be obtained in listening to the sound.
[0007]
The present invention aims to provide a headphone driver which can solve all the above
problems by improving the structure of the driver.
[0008]
According to the first aspect of the headphone driver of the present invention, a concave portion
is formed at the center of the substantially disk-like driver frame, and a magnetic circuit
consisting of a yoke, a magnet and a pole piece is provided in the concave portion. In the
headphone driver having a disk-shaped diaphragm disposed in the vicinity, the distance between
the mounting position of the disk-shaped diaphragm on the driver frame and the innermost side
surface of the driver frame is the outer edge of the peripheral flange portion of the driver frame.
The distance between the innermost side of the driver frame and the inner side of the driver
frame is half or more, and the inner side of the driver frame, other than the back position of the
mounting base for the electrical wiring board attached to the outer side of the driver frame Is a
headphone driver characterized in that no convex portion is formed.
[0009]
In the headphone according to claim 1 of the present invention, the distance between the
mounting position of the disk-shaped diaphragm on the driver frame and the innermost surface
of the driver frame is the outer edge of the peripheral flange portion of the driver frame and the
innermost surface of the driver frame. As a result, it is possible to secure an air cavity larger than
ever before between the disk-shaped diaphragm and the innermost surface of the driver frame,
and as a result, The collaborative action is complete, preventing the occurrence of dips and
improving the sound listening effect.
Further, since the present invention does not form any convex portion other than the back
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3
surface position of the mounting base of the electric wiring substrate mounted on the outer
surface of the driver frame, which is the inner surface of the driver frame, A large size can be
secured, and an effect that the flow of sound waves in the air cavity is not disturbed can be
achieved.
[0010]
It is a longitudinal section of a driver bar concerning the present invention.
It is a longitudinal cross-sectional view of the conventional driver. It is a graph which shows the
frequency characteristic measurement result of the driver concerning this invention. It is a graph
which shows the frequency characteristic measurement result of the conventional driver.
[0011]
Hereinafter, embodiments of the headphone driver of the present invention will be described
with reference to the drawings, but the present invention is not limited to these embodiments.
The headphone driver 1 according to the present invention has a recess formed at the center of
the substantially disk-like driver frame 3, and a magnetic circuit consisting of the yoke 6, the
magnet 7 and the pole piece 8 is mounted in the recess. Of the peripheral flange portion 9 of the
driver frame 3 and the distance dimension L1 between the attachment position P1 of the disk
shaped diaphragm 2 to the driver frame 3 and the innermost side surface P2 of the driver frame
3. The space L2 is configured to be a half or more of the distance dimension L2 between the
outer edge P3 and the innermost surface P2 of the driver frame 3.
[0012]
As described above, in the headphone driver 1 of the present invention, since the gap dimension
L1 is larger than the gap dimension L2, the large air cavity 4 is secured at the position of the gap
dimension L1. Since the air stored in the air cavity 4 communicates with the outside air through
the acoustic hole 5, the cooperative action of the air cavity 4 and the acoustic hole 5 is
completed, and the resonance sound of the disk-shaped diaphragm 2 is It will not appear as a
dip.
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4
[0013]
Furthermore, since the present invention does not form any convex portion other than the back
surface position of the mount of the printed circuit board (PCB) mounted on the outer surface of
the driver frame 3 on the inner surface of the driver frame 3, the air cavity The volume of 4 can
be secured to the maximum, and at the same time the flow of sound waves in the air cavity is not
disturbed, so that the cooperation between the air cavity 4 and the acoustic hole 5 will be more
effective. In the driver frame 3 of the conventional product, of course, the back surface position
of the mounting base of the printed circuit board (PCB) mounted on the inner surface of the
driver frame 3 and on the outer surface of the driver frame is other than that However, the
presence of a plurality of convex portions causes the presence of the convex portions to reduce
the volume in the air cavity 4 or causes the flow of sound waves to be inhibited. However, in the
present invention, All these negative effects have been eliminated.
[0014]
3 and 4 are graphs showing the results of measurement of frequency characteristics obtained
from the structure of the air cavity 4. In the graph of FIG. 3 showing the results of the present
invention, no dip is seen, but In the graph of FIG. 4 showing the results of the above, it was found
that a large dip appeared at around 3 K [Hz].
[0015]
From the above, it was found that the driver according to the present invention has an improved
sound listening effect.
[0016]
According to the present invention, it can be used in the field of handling headphones.
[0017]
1 driver for headphone 2 disc-shaped diaphragm 3 driver frame 4 air cavity 5 acoustic hole 6
yoke 7 magnet 8 pole piece 9 peripheral flange portion of driver frame P1 mounting position of
disc-shaped diaphragm to driver frame P2 innermost of driver frame Side P3 Outer edge of
peripheral flange of driver frame Distance between L1 P1 and P2 Distance between L2 P2 and
P3
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