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JP2004274224

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DESCRIPTION JP2004274224
An object of the present invention is to provide a speaker of high quality in which deterioration
of sound quality due to vibration of a magnetic circuit of the speaker is suppressed. A speaker
according to the present invention has an elastic body 15b disposed in a gap between a frame
body 15 and a mounting portion 15a, and a baffle plate on which the mounting portion 15a and
the mounting portion 15a are mounted by the elastic body 15b. A high-quality speaker that
attenuates the transmission of vibration to 8 and reduces the unnecessary vibration generated
from the mounting portion 15a and the baffle plate 8 and the intermodulation distortion
generated due to the unnecessary vibration of the diaphragm 4 It is possible to offer. [Selected
figure] Figure 1
スピーカ
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various acoustic devices. 2. Description of the Related Art A conventional
loudspeaker will be described with reference to a half sectional view of the loudspeaker shown in
FIG. 4 and a partially enlarged sectional view of a developed example of the prior art shown in
FIG. According to the same figure, 1 is composed of a yoke 1a, an annular magnet 1b adhesively
bonded on the central part of the yoke 1a, and an upper plate 1c adhesively bonded thereon, the
upper plate 1c A magnetic circuit in which a magnetic gap 1d is formed between the inner
peripheral side surface of the yoke 1a and the outer peripheral side surface of the yoke 1a, 2 is a
frame adhesively coupled to the magnetic circuit 1, and 4 is an inner periphery of the magnetic
circuit 1 The diaphragm is adhesively bonded to the voice coil 3 in which the coil portion 3a is
fitted in the magnetic gap 1d, and the outer periphery is adhesively bonded to the frame 2
through the edge portion 4a, 4b is a dust cap, and 5 is the voice coil It is a damper that supports
3 vertically movably. Reference numeral 2 a denotes a mounting portion having a mounting hole
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2 b provided on the outer periphery of the frame 2, and the speaker is fixed to the baffle plate 8
by a screw 9 through the gasket 7 to the baffle plate 8. FIG. 5 shows a speaker according to a
developed example of this conventional speaker, which is intended to suppress the influence of
vibration upon driving on the outer peripheral portion. If only differences from FIG. 4 are
described, 10 is a frame. 10a is a mounting portion on the outer peripheral side separated from
the frame 10, and the frame 10 and the mounting portion 10a are combined by a gasket 10b
made of an elastic body, and the frame 10 and the baffle plate 8 are fixed by screws 11. (See, for
example, Patent Document 1). As in the above-described configuration, the mounting portion 10a
is separated from the frame 10 to be a separate member, and combined by means of the elastic
gasket 10b to suppress vibration of the mounting portion 10a, and unnecessary noise from the
mounting portion 10a. It is intended to reduce the radiation level. Patent Document 1: Japanese
Utility Model Laid-Open Publication No. Hei 2-93894 Problems to be Solved by the Invention In
recent years, there is a tendency for the weight of the speaker to be reduced. There is a strong
demand for weight reduction of parts, and the use of a neodymium magnet with high magnetic
force from the ferrite magnet of magnet 1b used for magnetic circuits makes it possible to
reduce the size and weight, and resin the material of frame 2 (iron and aluminum die cast) In
addition, it is possible to reduce the weight as much as possible by making it as thin as possible.
However, there is a limit in any of the above-described configurations in order to suppress the
vibration of the magnetic circuit 1 after achieving weight reduction such as resin molding of the
frames 2 and 10. The present invention solves such a problem, and the vibration on the magnetic
circuit side is transmitted from the mounting part of the speaker to the baffle plate through the
frame to cause deterioration of the sound quality, and the vibration of the baffle plate It is an
object of the present invention to prevent deterioration of sound quality by causing a new
unwanted vibration to return to the speaker main body. SUMMARY OF THE INVENTION In order
to solve the above-mentioned problems, a speaker according to claim 1 of the present invention
has a joint portion with a frame of an edge of a frame having a mounting portion for mounting
on the outer periphery thereof. It is a speaker in which the inner peripheral side and the outer
peripheral side are connected by an elastic body at a position of an outer periphery and an inner
periphery than the mounting portion, and the elastic body is the mounting portion or the
mounting portion. Dampens the transmission of vibration to the baffle plate on which it is
mounted, and vibrates in the direction that absorbs the reaction of the voice coil of the speaker
body, consuming energy of unnecessary vibration, and unnecessary vibration generated from the
mounting portion or baffle plate It is possible to provide a high quality speaker capable of
reducing inter-modulation distortion which has been caused by unnecessary vibration of the
diaphragm and the vibration plate. The speaker according to claim 2 of the present invention is
provided by filling the elastic body of the frame of the speaker according to claim 1 in the gap
between the inner peripheral side and the outer peripheral side of the frame, and the elastic body
is provided. It can be very easily formed by filling with a resin or the like. According to a third
aspect of the present invention, there is provided the speaker according to the second aspect,
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wherein the extension portion is projected on the side opposite to the lower end of at least one of
the mutually opposing surfaces on the inner peripheral side or the outer peripheral side. The
extension portion prevents dripping at the time of filling, and the elastic body can be easily
formed. According to a fourth aspect of the present invention, there is provided the speaker
according to the second or third aspect, wherein a part of the gap on the inner circumferential
side and the outer circumferential side of the frame is bridged and integrated. By integrally
forming the inner and outer peripheries of the frame, the positional relationship between the
inner and outer peripheries of the frame can be easily maintained, and the workability of the
filling operation when forming the elastic body can be improved. BEST MODE FOR CARRYING
OUT THE INVENTION An embodiment of a loudspeaker according to the present invention will
be described below with reference to FIGS. 1 to 3. In the description, the same parts as in the
prior art will be assigned the same reference numerals and explanations thereof will be omitted.
Embodiment 1 FIG. 1 is a half cross-sectional view of a loudspeaker according to an embodiment
of the present invention, which mainly describes claims 1 and 2. As shown in FIG. Only
differences from the prior art will be described with reference to FIG. 1. The difference lies in the
configuration of the frame, and in the present embodiment, the portion having the same function
as the conventional frame 2 is the frame body 15 and the outer periphery thereof. A mounting
portion 15a having a mounting hole 15c for mounting a speaker to the baffle plate 8 via a gasket
7 by means of a screw 9 annularly provided on the side, and an elastic body 15b connecting and
connecting the frame main body 15 and the mounting portion 15a It is done. When the speaker
is driven, the voice coil 3 vibrates, and the reaction causes the magnetic circuit 1 to vibrate in the
opposite direction, and the frame main body 15 generates unnecessary vibration. However, the
elastic body 15 b is made into the frame main body 15 and the mounting portion 15 a The
transmission of the unnecessary vibration to the mounting portion 15a and the baffle plate 8 is
damped / suppressed because it is interposed between them. Moreover, it vibrates in the
direction which absorbs the reaction of voice coil 3 of a speaker, and energy of unnecessary
vibration will be consumed. As a result of the above, the unnecessary sound radiation generated
from the mounting portion 15 a and the baffle plate 8 can be attenuated, and the influence of the
unnecessary vibration on the diaphragm 4 can also be suppressed to reduce the intermodulation
distortion. It is. In addition to rubber and elastomer, the frame body 15 and the mounting portion
15a are disposed on the elastic body 15b in a mold, and a synthetic rubber such as silicon based
in the gap is a resin having an elastic force even after curing. It is also possible to form by filling,
and as an elastic body is simultaneously formed when integrating the frame body and the
mounting portion, there is no need to manage as a part, and it is formed by an easy method of
filling Is possible. Second Embodiment A loudspeaker according to another embodiment of the
present invention will be mainly described with reference to a half cross-sectional view of the
loudspeaker shown in FIG. The difference between the second embodiment and the first
embodiment will be described with reference to this figure. The difference is the shape of the
annular attachment portion 15 a of the frame, and the inner peripheral side of the attachment
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portion 15 a facing the frame main body 15. It is a point which provided the extension part 15d
toward the frame main body 15 side at the lower end. The extension portion 15d is provided
over the entire circumference without contacting the frame main body 15, but when the elastic
body 15b is formed by filling, it is prevented from flowing out and at the time of formation of the
elastic body 15b. The mold for setting the speaker main body 15 and the mounting portion 15a
can be simplified.
In the present embodiment, the extension 15d is provided at the lower end on the inner
peripheral side of the mounting portion 15a, but is made to project toward the mounting portion
15a at the lower end on the outer peripheral side facing the mounting portion 15a of the frame
main body 15. May be provided. Third Embodiment Another embodiment of the present
invention will be mainly described with reference to FIG. 3 with a partial top view of the speaker
shown in FIG. The difference between the second embodiment and the second embodiment will
be described with reference to this figure. The difference is that a rib 15e for bridging the two is
integrally provided in the gap between the frame main body 15 and the mounting portion 15a.
As a result, the frame main body 15 and the mounting portion 15a can be integrally molded with
the same mold by molding, and the number of parts can be reduced, and handling, holding of the
gap between the two and holding of the shape can be extremely easily performed. Since the ribs
15e attenuate the vibration absorbing action of the elastic body 15b, the number and shape of
the ribs 15e should be the minimum necessary to suppress the attenuation as much as possible,
and the effect of the elastic body and the attenuation thereof It should be selected appropriately
in the degree of As described above, the speaker according to the present invention contributes
to the suppression of unnecessary vibration and the improvement of the sound quality in the
tendency of weight reduction of the speaker by the elastic body. BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a half sectional view of a speaker according to an embodiment of the
present invention. FIG. 2 is a half sectional view of a speaker according to another embodiment
of the present invention. FIG. 4 is a partial top view of the speaker of FIG. 4 [FIG. 4] A partial
enlarged sectional view of a development example of a conventional speaker [Description of the
reference numerals] 1 magnetic circuit 1 d magnetic gap 3 voice coil 4 diaphragm 4 a Edge
portion 5 Damper 15 Frame body 15a Mounting portion 15b Elastic body 15d Extension portion
15e Rib
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