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1. Name of invention Speaker address 1- 8-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo (Shinkan Hill)
Place Tokyo (03) 343-5821 (representative) [Phase] Japan Patent Office ■ Open to the public
JP-A 51-958340 Japanese Journal 51. (1976) 8.23 Japanese Patent Application No. 7-ρ--7
Yume / [Phase] Application Date Akira Chi, (1,97 phantom 1.20 examination request unclaimed
(all three giants) Office internal reference number Meg I A) Description of the Invention Name of
the Speaker Name of the Invention of the Speaker
40 agents cloudy 160
DETAILED DESCRIPTION OF THE INVENTION The loudspeaker is conventionally configured as
shown in FIG. In FIG. 1, il + is the frame, 12) is the yoke, (3) is the magnet, (41 is the pole piece,
(5) is the fyl bobbin, (61 is the voice coil / l-, (( 7) is a cone, (81 is an edge, and (9) is a damper.
The damper +91 has an annular shape as shown in FIG. 2 as a whole, and a plurality of
corrugations a.alpha. Are attached concentrically, the outer portion .alpha..perp. Is for the frame
(1) and the inner portion 112 is for the coil bobbin (5). It is fixed. FIG. 3 is a cross-sectional view
of a part of the damper (9), the solid line shows its resting state, the dotted line shows the
moment it moves forward during vibration by the low frequency signal of the coil bobbin (5), the
alternate long and short dash line moves backward Each shows an instant. As is clear from this,
theoretically, when moving forward, the circular locus passing point A decreases in its radius (the
circle becomes smaller), and therefore each point on this circular locus is 2 in the circumferential
direction. In shrinking, the circular locus passing through the point B increases its radius (the
circle becomes larger), so that each point on this circular locus extends in the circumferential
direction. Father, when moving backwards, the circular locus passing through one point A-its
radius increases, so each point on this circular locus will extend in the circumferential direction,
and the circular locus passing through point B is Its radius decreases, so that each point on this
circle locus will shrink in the circumferential direction. As described above, each part of the
damper (91 has to expand and contract in response to vibration, but it is impossible to perform
the above-mentioned operation with a damper that is actually used, and therefore anomalous
deformation actually occurs. It vibrates (moves back and forth). This contributes to the nonlinearity of the signal-sound pressure characteristics of the damper (9). Father, the damper (9's is
a suitable board EndPage: 1 sheet of paper or cloth, etc., because it is formed by attaching a
concentric corrugation ridge to the material of a dog. The front and back of the material of the
shape are considered as asymmetric. Therefore, when the F '+ +9+ moves forward and when it
moves -14, its stiffness is different, which also causes the non-linearity of the above
characteristics. The present invention avoids the mermaid of the above-mentioned subject (the
present invention (according to the present invention will be described by referring to FIG. 4). B.
The corresponding part VC to FIG. 1 to FIG. 3 is attached to the same reference numeral and its
explanation is omitted.
In the present invention, in the present invention, the inner side of the turn bar (9) as an
attachment to the coil bobbin (5) and the outer side of a part of the frame to the frame tit are
serpented. ((1 plurality of, for example, eight supporting portions (13a) to (13h) are formed as an
outer portion) and an inner portion O3), as required. Each of these supporting lines (13a) to
(13h) has an equiangular distance passing through the center O; l, and i: ': extended along an
imaginary line (X <a> to (1411) K divided into three And each support part is formed in left-right
symmetrical JP-A-5l-95834 (Z) l :)) shape when viewed from the front with respect to the central
imaginary line. Further, corrugations (15a) to (15h) are attached to the respective supporting
portions (13a) to (13h) along straight lines orthogonal to the respective imaginary lines (14a) to
(14h). Furthermore, in the present invention, the shape of the support portion is configured to be
symmetrical with each other, for example, every predetermined support portion. That is, the
supporting portions (13a), (13C), (13e) and (13g) have the same shape, for example, as shown in
FIG. 5, and the supporting portions (1, 3a) are sectioned on the imaginary line (14a). The support
portions (13b), (13d), (13f) and (13h) are formed as shown in FIG. 5 and the bcc or r-cXRm (13b)
on the phantom line (14b). The cross section is formed as shown in FIG. In this case, as is clear
from FIGS. 5A and 5B, both are formed so as to be y-symmetrical with respect to each other with
respect to the front and back. In the example shown in FIG. 4, each support portion (13a) to
(13h) is formed with the same width from the inner portion σ2 to the outer portion αυ so that
a trapezoidal space (gap) is formed between each support portion. Although it is formed, it can
also be formed as shown in FIG. That is, each support portion (13a) to (13h) is moved from the
inner portion 12+ to the outer portion f1. It can be formed such that its width becomes gradually
larger as it goes to D1c, so that a narrow slit can be formed between each support. In FIG. 4 and
FIG. 6, thick lines of the corrugation are convex and thin lines are concave. Such a damper (the
outer part flit of the damper 91 is fixed to a suitable fixing part such as the frame of the speaker,
and the father, the inner part a3 is fixed to the cut part of the speaker, for example, the fill
bobbin 5). In addition, the material of this damper can use the thing by which the overcharge is
used. According to the present invention described above, since the support portions (13a) to
(13b) are alternately formed so as to be symmetrical with respect to the front and back, when the
damper (9) moves forward and backward In the case of moving to, the stiffness is equal to one
Since the father, each of the support portions (13a) to (13h) f, each of the ridges (15a) to (xsh) is
also formed in a ridge line and is b, FIG. As described above, expansion and contraction in the
circumferential direction are eliminated, and in the present invention, the car displacement curve
of the damper (9) is linear with respect to the origin with respect to the origin. As described
above, according to the present invention, the present invention is characterized in that a speaker
with little distortion can be manufactured. In the embodiment shown in FIGS. 4 and 6, the
support portions (13a) to (13h) are alternately distributed so as to be symmetrical in the back
and forth direction. However, as shown by the alternate long and short dash lines in FIG. Further
slits may be provided at the center of the part so that every two supports may be symmetrical
relative to one another with respect to the front and back.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a speaker, FIG.
2 is a front view of its damper, 31st is a sectional view showing a part of the operation of this
damper, and FIG. FIG. 5 is a front view of an example of a damper that can be used for a speaker,
FIG. 5 is a cross-sectional view thereof, and FIG. 6 is a front view receiving another embodiment
of the damper. (9) is a damper, aυ is its outer side, u21 is its inner side, (13a) to (13h) is a
support, and (15a) to (15h) is a corrugation, respectively. EndPage: 2 Fig. 1 Fig. 2 Fig. 3 Motion
morning Fig. 4 Fig. 6, Inventors other than the above Name Yukura Yukura EndPage: 3
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