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JPH09116995

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DESCRIPTION JPH09116995
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elongated speaker.
[0002]
2. Description of the Related Art In recent years, with the spread of high vision and wide vision
television receivers, etc., the screen of a television receiver is becoming generally wide. On the
other hand, however, narrow and thin television receivers are desired as a whole because of the
housing situation in Japan.
[0003]
A speaker unit for a television receiver (hereinafter referred to as a speaker) is usually attached
to both sides of a cathode ray tube, which contributes to increasing the width of the television
receiver. Therefore, a speaker having a slender structure such as a rectangular shape or an
elliptical shape has conventionally been used for a television receiver. In addition, as the width of
the cathode ray tube is increased, it is required to further narrow the width of the speaker, and at
the same time, it is also required to improve the sound quality of the audio corresponding to the
high image quality of the screen.
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[0004]
Here, a conventional elongated speaker will be described with reference to FIGS. 5 (a) to 5 (c).
FIG. 5 is a block diagram of a conventional speaker of elongated structure, in which (a) is a plan
view, (b) is a cross-sectional view in the major axis direction, and (c) is a cross-sectional view in
the minor axis direction. In the figure, reference numeral 12 denotes an elongated diaphragm
which generates air vibration. An edge 13 is joined to the outer peripheral portion of the
diaphragm 12, and the outer peripheral portion of the edge 13 is held by the frame 14.
[0005]
A voice coil bobbin 15 is fixed to a central portion of the diaphragm 12 and is vibratably held by
the frame 14 via a damper 16. On the other hand, a magnetic circuit 20 consisting of a yoke 17,
a magnet 18 and a plate 19 is provided in the central recess of the frame 14. Then, the voice coil
wound around the voice coil bobbin 15 is held in the gap of the magnetic circuit 20, and the
voice coil bobbin 15 performs a piston motion by the drive current, and the diaphragm 12
vibrates in that direction. As a result, sound waves are emitted from the diaphragm 12.
[0006]
However, in the conventional speaker as described above, since the central portion of the
elongated diaphragm 12 is point-driven and supported only by the damper 16, split resonance
and rolling in the long axis direction are realized. Is easy to occur. As a result, peak dips occur on
the frequency characteristics of the reproduced sound pressure in the middle and high regions,
and rolling distortion occurs in the low region, resulting in deterioration of the sound quality.
[0007]
Furthermore, both the radius of curvature and the width of the damper 16 are reduced in order
to be housed inside the frame 14, and it is necessary to increase the stiffness of the vibration
system in order to secure a certain level of input resistance. As a result, the lowest resonance
frequency fo is increased, which makes it difficult to reproduce the bass range.
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[0008]
The present invention has been made in view of such conventional problems, and although it is
an elongated structure, split resonance is unlikely to occur and flat frequency characteristics are
obtained, and the lowest resonance frequency fo is suppressed to a low level. It is an object of the
present invention to obtain a speaker with excellent sound quality that enables reproduction of a
sound range.
[0009]
SUMMARY OF THE INVENTION The speaker of the present invention comprises another damper
for holding the inner surface of the diaphragm parallel to the major axis direction of the
diaphragm in a vibrating manner, and this configuration provides a vibration system. The rolling
phenomenon can be prevented in a state where the stiffness of the above is kept small, the
divided resonance can be prevented, and a speaker with excellent frequency characteristics can
be provided.
[0010]
According to a first aspect of the present invention, there is provided a non-axisymmetric
diaphragm having a major axis and a minor axis in plan view in the direction of vibration, and an
outer peripheral surface of the diaphragm. There is provided an elastic edge which is joined
along a strip shape and holds the diaphragm in a vibrating manner, a voice coil whose upper end
is adhered to the diaphragm, and an elastic member which holds the outer periphery of the voice
coil in a vibrating manner. A damper, a magnetic circuit for applying a magnetic flux for vibration
to the voice coil, another damper for vibratably holding the inner surface of the diaphragm
parallel to the major axis direction of the diaphragm, an outer peripheral portion of the edge,
magnetism It consists of a circuit and a frame that holds the damper, and the other damper
makes it possible to prevent the rolling phenomenon in a state where the stiffness of the
vibration system is kept small, to prevent split resonance, and to have excellent frequency
characteristics. It is those that can provide the speaker.
[0011]
According to the second aspect of the present invention, the non-axisymmetric diaphragm having
a major axis and a minor axis as viewed in the vibration direction is joined in a strip along the
outer peripheral surface of the diaphragm to vibrate the diaphragm. And an elastic member
having an elastic edge for holding the voice coil, a voice coil whose upper end is adhered to the
diaphragm, an elastic member which holds the outer peripheral portion of the voice coil so as to
vibrate freely, and a magnetic flux for vibration to the voice coil. In the minor axis direction of
the diaphragm, the magnetic circuit that provides the vibration resistance, the thin plate-like
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connecting member provided in the minor axis direction of the diaphragm and joined to the inner
surface of the diaphragm, and the lower end side of the coupling member It consists of another
damper consisting of parallel elastic members, the outer peripheral part of the edge, a magnetic
circuit, a damper and a frame for holding the other damper, and the thin plate-like connecting
member and the other damper make up the claim Term Stiffness speaker Like the vibration
system according can prevent rolling phenomenon in a state where the maintaining small, to
prevent split resonance are those which can provide the speaker with excellent frequency
characteristics.
[0012]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to
4.
The same parts as in the prior art will be described with the same reference numerals.
[0013]
(First Embodiment) FIG. 1 is a block diagram of a speaker having an elongated structure in the
first embodiment, where (a) is a plan view, (b) is a cross-sectional view in the major axis direction,
and (c) is a cross-section in the minor axis direction. FIG. 2 is an exploded perspective view.
In the figure, reference numeral 1 denotes a substantially track-shaped diaphragm which
generates air vibration, which is non-axisymmetric having a major axis direction and a minor axis
direction as shown in FIGS. 1 (b) and 1 (c). It has a concave shape.
Further, an edge 3 is joined to the outer peripheral portion of the diaphragm 1, and the edge 3 is
held by the frame 5 in a freely vibrating manner.
Further, the diaphragm 1 is vibratably held by the frame 5 by another damper 4 provided along
the back minor axis direction. The other dampers 4 are formed in a wave shape along the long
diameter side of the diaphragm 1 by an elastic material, and a pair of the dampers 4 is provided
to the diaphragm 1. Reference numeral 2 denotes a damper for supporting the voice coil 6.
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[0014]
A magnetic circuit 10 consisting of a yoke 7, a magnet 8 and a plate 9 is incorporated in a recess
in the central portion of the frame 5, and a coil portion of the voice coil 6 acts as a damper 2 in
the air gap of the magnetic circuit 10. It is held in place without being eccentric.
[0015]
When an input signal is applied to the voice coil 6 in such a configuration, the voice coil 6 moves
in a piston by action of the magnetic flux generated in the air gap of the magnetic circuit 10, and
the upper end of the voice coil 6 is coupled. The diaphragm 1 also vibrates in accordance with
the piston movement to emit a sound wave.
[0016]
Now, in the conventional speaker as shown in FIG. 5, since it is held only by the circumferential
or elliptical circumferential damper 16, a force works also in the circumferential direction along
with the vertical movement.
In order to reduce the rolling phenomenon due to this, it is necessary to increase the stiffness.
On the other hand, by providing another damper 4 as in the first embodiment, it is possible to
suppress the force in the circumferential direction accompanying the vertical movement, and to
reduce the stiffness of the entire vibration system. As a result, the lowest resonance frequency fo
can be suppressed to a low level, and the bass range can be reproduced.
[0017]
(Second Embodiment) FIG. 3 is a block diagram of a speaker having an elongated structure
according to a second embodiment, wherein (a) is a plan view, (b) is a sectional view in the major
axis direction, and (c) is a cross section in the minor axis direction. FIG. 4 is an exploded
perspective view. In the figure, reference numeral 1 denotes a substantially track-shaped
diaphragm which generates air vibration, which is non-axisymmetric having a major axis
direction and a minor axis direction as shown in the figure, and has a depressed shape at a
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central portion.
[0018]
The edge 3 is joined to the outer peripheral portion of the diaphragm 1 and is held by the frame
5 so as to be freely vibrated via the edge 3. The diaphragm 1 is also held by another damper 4
made of an elastic material through the connecting member 11. The other damper 4 is provided
at a part of the opening of the frame 5. The connecting member 11 is a thin plate member whose
upper portion is formed in a shape along the minor axis direction of the back surface of the
diaphragm and whose lower portion is formed in a rectangular shape, and a plurality of
connecting members 11 are attached in the major axis direction of the diaphragm 1. Further, the
lower end portion of the connecting member 11 is fixed to another damper 4 so that the
connecting member 11 can be vibrated integrally with the diaphragm 1. The other dampers 4 are
fixed to the frame 5 at both ends. The other dampers 4 according to the second embodiment of
the present embodiment have a short length along the diaphragm 1 and are provided one by one
with respect to the connection member 11.
[0019]
As described above, in the conventional speaker, since the damper is held only by the
circumferential or elliptical circumferential damper 16, a force also acts in the circumferential
direction along with the vertical movement, and the rolling phenomenon due to this is reduced
Although it has been necessary to increase the stiffness, by providing another damper 4 as in the
second embodiment, the force in the circumferential direction accompanying the vertical
movement is suppressed to reduce the stiffness of the whole vibration system. As a result, while
suppressing a division | segmentation resonance, the lowest resonance frequency fo is
suppressed low and reproduction | regeneration of a bass region is enabled.
[0020]
As described above, in the case of providing another damper parallel to the major axis direction
of the diaphragm, the entire vibration system integrally vibrates in one direction, and
accordingly, division of the diaphragm in the major axis direction Resonance is less likely to
occur, and flat sound pressure frequency characteristics can be obtained in the mid-high range.
Moreover, the force in the circumferential direction accompanying the up and down movement
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can be suppressed to reduce the stiffness of the entire vibration system, and the bass range can
be further reproduced. Further, even in the case of providing another damper parallel to the
minor axis direction of the diaphragm and connecting it to the diaphragm by the connecting
member, the entire vibration system integrally vibrates in one direction. Therefore, split
resonance in the major axis direction of the diaphragm is less likely to occur, and flat sound
pressure frequency characteristics can be obtained in the middle and high frequencies. Moreover,
the force in the circumferential direction accompanying the up and down movement can be
suppressed to reduce the stiffness of the entire vibration system, and the bass range can be
further reproduced.
[0021]
Brief description of the drawings
[0022]
FIG. 1A is a plan view of an embodiment of the speaker according to the present invention
[0023]
Figure 2 same exploded perspective view
[0024]
FIG. 3A is a plan view of another embodiment of the speaker according to the present invention.
[0025]
Fig. 4 same exploded perspective view
[0026]
Fig. 5 (a) A plan view of a conventional speaker
[0027]
Explanation of sign
[0028]
1 diaphragm 2 damper 3 edge 4 other damper 5 frame 6 voice coil 10 magnetic circuit
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