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JPH07123492

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DESCRIPTION JPH07123492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for earphones.
[0002]
2. Description of the Related Art A conventional earphone will be described with reference to FIG.
In FIG. 4, reference numeral 1 denotes a diaphragm formed of a plastic film, which is provided on
a dome portion 2 at the center, a circular bulging portion 3 surrounding the periphery of the
dome portion 2, and an outer periphery of the bulging portion 3 And an edge 4.
[0003]
5 is a magnet, 6 is a plate installed on the upper surface of the magnet 5, 7 is a yoke installed
and fixed to the lower part of the magnet, and the magnet 5, the plate 6 and the yoke 7
constitute a magnetic circuit. The air gap formed between the side surfaces of the magnet 5 and
the plate 6 and the inner side surface of the yoke 7 is used as a gap 8 to guide the magnetic flux
from the magnet 5 to the voice coil 9.
[0004]
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1
A voice coil 9 is loosely fitted to the upper portion of the plate 6 and supported by the frame 10
via the diaphragm 1, and the peripheral portion of the diaphragm 1 and the peripheral portion of
the frame 10 are the diaphragm 1 at the upper portion. It is connected by the edge 4 which
comprises. In the earphone configured as described above, when a signal current is supplied to
the voice coil 9, the diaphragm 1 vibrates in the direction of front and back to generate a sound.
At this time, if the signal current flowing through the voice coil 9 becomes too large, the stretch
limit of the plastic film may be exceeded, and a part of the diaphragm 1 may be broken or
dented. When this break or dent occurs, the sound generated from the diaphragm 1 is distorted
not in proportion to the input.
[0005]
Therefore, in order to prevent the occurrence of breakage, dents and the like in the diaphragm 1,
as shown in Japanese Utility Model Laid-Open Publication No. 1-64,291, sand-like irregularities
are formed on the plate surface of the diaphragm formed of a plastic film. Proposed.
[0006]
SUMMARY OF THE INVENTION However, as in the above-mentioned conventional apparatus, in
the case where sand-like unevenness is formed on the plate surface of a diaphragm formed of a
plastic film, a bulging portion, which requires flexibility, and There is a problem that the strength
is increased to the edge portion, and the sound of the bass portion is not generated.
[0007]
An object of the present invention is to provide a diaphragm for earphones capable of preventing
the occurrence of breakage, dents and the like in the diaphragm without suppressing the
generation of the sound of the bass portion.
[0008]
SUMMARY OF THE INVENTION The present invention comprises a central dome portion made of
a plastic film, a circular bulging portion surrounding the periphery of the dome portion, and an
edge provided on the outer periphery of the bulging portion. In the diaphragm for earphones
configured, while forming a tangential sectional corrugation with a V-shaped cross section
having a constant angle with the radial direction of the diaphragm in the bulging portion, sandlike unevenness is formed in the dome portion. It is provided.
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2
[0009]
Further, the sand-like unevenness is provided on the dome portion and a portion excluding the
peripheral edge of the tangential corrugation of the bulging portion.
[0010]
[Function] Therefore, sand-like unevenness is provided on the tundal corrugation formed on the
bulging portion of the diaphragm, and on the central dome portion or a portion of the central
dome portion and the peripheral portion of the tundal corrugation of the bulging portion. As a
result, it is possible to prevent the diaphragm from being broken or dented without increasing
the strength of the edge portion of the diaphragm.
[0011]
Embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
1 is a front view showing an embodiment of a diaphragm for earphone according to the present
invention, FIG. 2 is a front view showing another embodiment of a diaphragm for earphone
according to the present invention, and FIG. 3 is a diaphragm for the same earphone. It is a
frequency characteristic view of the used earphone.
The same reference numerals as in FIG. 4 denote the same parts in FIG. 1 and FIG.
[0013]
In FIG. 1, reference numeral 1 denotes a diaphragm formed of a plastic film, which is provided on
a dome portion 2 at the center, a circular bulging portion 3 surrounding the periphery of the
dome portion 2, and an outer periphery of the bulging portion 3 And an edge 4.
Then, in the bulging portion 3, there is formed a tangential corrugation 11 having a V-shaped
cross section having a constant angle with respect to the radial direction of the diaphragm 1. A
sand-like unevenness 12 is provided on a portion other than the periphery of the corrugation 11.
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3
[0014]
When an earphone is configured using the diaphragm 1 as described above, even if the current
flowing through the voice coil 9 is increased and the amplitude of the diaphragm 1 is increased
and a bending stress is generated in a part of the diaphragm 1, the unevenness 12 is Even when
the provided portion is easily bent, the bending stress is not concentrated on a part of the
diaphragm 1, and the current flowing to the voice coil 9 is reduced and the amplitude of the
diaphragm 1 is reduced. Since the tangential corrugation 11 is formed at the out portion 3 and
the sand-like unevenness 12 is not provided at the peripheral edge, flexibility is maintained at the
bulging portion 3 and the edge 4 and generation of the sound of the bass portion There is no
control.
That is, as shown in the frequency characteristic diagram of FIG. 3, the reproduction area can be
sufficiently secured in the low frequency (bass) portion less than 50 Hz.
[0015]
Next, another embodiment will be described based on FIG.
[0016]
In FIG. 2, reference numeral 1 denotes a diaphragm 1 formed of a plastic film, which is provided
on a dome portion 2 at the center, a circular bulging portion 3 surrounding the periphery of the
dome portion 2, and the bulging portion 3 And an edge 4.
Then, a tangential V-shaped cross section V 11 having a constant angle with respect to the radial
direction of the diaphragm 1 is formed in the bulging portion 3, and the dome portion 2 is
provided with a sand-like unevenness 12. It is done.
[0017]
When an earphone is configured using the diaphragm 1 as described above, even if the current
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4
flowing through the voice coil 9 is increased and the amplitude of the diaphragm 1 is increased
and a bending stress is generated in a part of the diaphragm 1, the unevenness 12 is Even when
the provided portion is easily bent, the bending stress is not concentrated on a part of the
diaphragm 1, and the current flowing to the voice coil 9 is reduced and the amplitude of the
diaphragm 1 is reduced. Since the sand-like unevenness 12 is not provided in the projecting
portion 3 and the tangential corrugation 11 is formed, flexibility is maintained in the bulging
portion 3 and the edge 4 to suppress the generation of the sound of the bass portion I have not.
That is, as shown in the frequency characteristic diagram of FIG. 3, the reproduction area can be
sufficiently secured in the low frequency (bass) area less than 50 Hz as in the above embodiment.
[0018]
As described above, according to the present invention, the tangential corrugation formed on the
bulging portion of the diaphragm, and the periphery of the central dome portion or the
tangential siding of the central dome portion and the bulging portion are excluded. By the sandlike unevenness provided on the portion, it is possible to prevent the diaphragm from being
broken or dented without increasing the strength of the edge portion of the diaphragm. It is
possible to prevent distortion of the sound generated from the diaphragm that is produced, and
to ensure sufficient reproduction of the sound of the bass portion.
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