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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view of a conventional dome
speaker, FIG. 2 is a cross sectional view of a conventional double support dome speaker, FIG. 3 is
a perspective view of the damper of the present invention, and FIG. 5 is a cross-sectional view of
a dome speaker using a damper device, FIG. 5 is a measurement point of displacement in a
diaphragm, FIG. 6 is an actual measurement value of vertical displacement of a diaphragm of a
conventional dome speaker, and FIG. It is the same measurement value of the diaphragm of the
dome speaker which used the apparatus 2. FIG. 31 is a peripheral fixing portion, 32.32 'is a
damper piece, and 33, 33' is a sticking portion. -45 one open 5014 24 4 (2)-46-
DETAILED DESCRIPTION OF THE INVENTION The main part of the present invention relates to a
damper device for a diaphragm that effectively prevented rolling of the diaphragm of the speaker
building. In the conventional dome-shaped speaker, as shown in FIG. 1, the outer peripheral edge
of the damper 2 mounted on the peripheral edge of the diaphragm 1 is fixed to the plate 5 or the
fixed portion 4 provided on the frame, and the voiceco 8 mounted on the diaphragm. The voice
coil 8 wound around the bobbin 3 is disposed in the magnetic gap 7 formed in the gap between
the plate 5 and the center ball 6. However, the dome speaker of the above-mentioned structure
has an uneven stiffness in the circumferential direction of the damper 2, an uneven weight in the
circumferential direction, and an uneven flux density caused by the uneven magnetic gap 7
during vibration. The rolling phenomenon (Fig. 1 'and Fig. 1) of the Heuss coil bobbin 3 is easy to
occur, so it causes gap slip, etc., and it has a defect that the reproduced sound is distorted or
abnormal noise is generated, It was In order to solve this defect, as shown in FIG. 2, by providing
dampers 22 and 22 'on the peripheral portion of the diaphragm 21 and the voice coil bobbin 23
below it, the voice coil bobbin 23 is laterally supported. Loudspeakers have been considered
conventionally. However, the double-supported structure described above has three major
drawbacks that reduce the efficiency of the speaker due to the increase in damper stiffness and
the increase in damper weight, and also the damper material cost and assembly The increase in
the number of man-hours has also been a cause of high product cost. The present invention is a
damper that solves the deficiencies of the conventional example described in F at once. The
damper according to the present invention is, as shown in FIG. 3, a t-shaped crystal damper 32
which is divided into dampers 432 and 32 'with a plurality of cuts provided radially leaving a
peripheral fixing portion 31 and divided into dampers 32 and 32'. , 32 'corrugation ridges and
projections are formed mutually opposite in the vertical direction, and the sticking portions 33,
33' formed by bending the inner peripheral tips of the damper pieces 32, 32 'vertically are
constant in the vertical direction The damper device has a structure in which the boundary
between the 1, 1 danopa strips 32, 32 'and the peripheral fixing portion 31 located at intervals is
bent. Therefore, when the voice coil bobbin 43 is inserted into the center hole 34 of the damper
of the present invention and the sticking portions 33, 33 'are stuck on the outer periphery
thereof, the voice coil bobbin 43 becomes worn and the I-shaped correction is made The upper
and lower two stages, i.e., l @ +-'@@@, are supported by the upper and lower parts 32, 32'. Thus,
it has the same effect as the double-supported damper as shown in FIG.
Solve the problem of increased weight and weight. (1) Uwata 1 In other words, since the damper
of the present invention can be formed from one sheet of damper material, there is no increase in
the weight of the tamper material, and no increase in stiffness, so a conventional double support
damper In contrast to the increase in stiffness and mold parts, the efficiency is lowered, but the
same efficiency as that of the conventional single-supported tamper can be maintained and the
rolling phenomenon of the voice coil bobbin can be prevented. Next, the measurement results of
the embodiment of the present invention will be described. FIG. 5 shows the measurement points
of the vertical displacement of the dome diaphragm: 51 is the center of the dome, 52 is the left
end, 53 is the right end, 54 is the upper end, 55 is the lower end It is. Z 'The displacement of
each point above the voltage through the capacitive converter only' I-UI. If it detects as change,
the data of FIG. 6 and FIG. 7 will be obtained. FIG. 6 is a dome diaphragm using the conventional
damper @ * R 1 '+ 5 shown in FIG. 1. FIG. 7 is a data rate of the dome diaphragm using the
damper of the present invention. In the figure, 61 and 71 indicate the measurement results at
measurement point 51, and 62 and 72 indicate 52, 63 and 73 indicate 53, 64 and 74 indicate
54, 65 and 75 indicate 55, respectively. . That is, as shown in FIG. 6, in the vicinity of 700 Hz, the
output type (1) of 63.64 is thicker (, 62, 65 is smaller) with respect to the dome center. This is an
amplitude of 52.55 or less relative to the amplitude of the V-center, and an amplitude of 54.53 or
greater, thus producing rolling on an axis approximately parallel to the line connecting the dome
diaphragm or 52.55. doing. In the vicinity of 900 Hz, the amplitude of 54 or the amplitude of 55
is large, so that at this frequency, a rolling phenomenon occurs in an axis substantially parallel to
the straight line connecting the diaphragm or 52.53. On the other hand, as shown in FIG. 7, the
amplitude of each measurement point of the dome diaphragm using the damper device of the
present invention is almost constant, and the rolling phenomenon does not occur. As described
above, since the speaker using the damper device of the present invention can effectively
suppress the occurrence of the rolling current rack, the amplitude in the vertical direction of the
diaphragm can be largely taken out, and the amplitude linearity is distorted. It is possible to
reproduce low-quality tones.
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