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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a general
speaker, FIG. 2 is a sound pressure frequency characteristic diagram when the same speaker is
incorporated in a bookshelf type box, FIG. 3 and FIG. 4 is a half sectional view of a diaphragm
used for a conventional speaker, FIG. 5 is a half sectional view showing one embodiment of the
diaphragm in the speaker of the present invention, FIG. 6 is a half bottom view, and FIG. FIG. 8 is
a diagram of sound pressure frequency characteristics when the same speaker is incorporated in
a bookshelf type box. 5 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Voice
coil, 12 иии ----- magnetic gap, a thin portion of the 16 ...... surface thickness. Figure 4 Figure 5
Figure 6
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker that
provides a flat sound pressure frequency custom when built into a bookshelf box by modifying
the diaphragm. In general, as shown in FIG. 1, the speaker is a magnetic circuit 5 comprising a
center, a plate 2 having a pole 1, a ring-shaped magnader '', 1) node 3 and a ring-shaped upper
plate 4 -5. The frame 6 is connected, the edge of the frame 6 is fixed to the edge of the frame 8
with the gasket 7, and the voice coil 1o is attached to the center of the diaphragm 8 The lower
part of the voice coil 1 o is inserted without eccentricity into the magnetic gihenop 12 of the
magnetic circuit 5 by holding the middle part damper 11 of the Heus coil 1 o without
eccentricity, and the upper surface of the central part of the diaphragm 8: paste the text canop
13 It is configured. When such a speaker is used by being incorporated into a Bonoc's elf-shaped
bonox, the sound pressure frequency characteristic rises as shown in FIG. 2 in the vicinity of 5 oo
Hz to 1.5 K [Iz, and a flat characteristic can not be obtained. It was full of things. Because of this,
in the prior art, as shown in FIG. 3, the peripheral portion of the diaphragm 8 is bent in the
horizontal direction, and ENO / 9 is attached to the bent portion 14, as shown in FIG. In this case,
the inner circumference 16 of ENO / 9 is largely enlarged, and the diaphragm 8 is extended by
the inner circumference 15 of this ENO / 9 so that resonance occurs in the vicinity of 500 Hz to
1000 Hz. However, in the case where the bending portion 14 is provided, variation in the
characteristic surface is likely to occur due to the unevenness 3 of the angle of the bending
portion 14 and this portion using the long inner peripheral portion 15 of 9 It is easy to cause
deformation at the same time, and it also has the disadvantage of becoming unstable in terms of
characteristics. As described above, the present invention is intended to eliminate the
conventional drawbacks and to provide a speaker which can obtain a flat sound pressure
frequency retention even when incorporated in a Bunkung Elf-shaped box by providing a thin
portion on the diaphragm. . Hereinafter, the speaker of the present invention will be described
with reference to FIGS. The overall configuration of the speaker is the same as that shown in FIG.
1, and here, only the diaphragm 8 will be described because it is characterized by the structure
of the diaphragm 8. As suspended in FIGS. 6 and 6, the diaphragm 8 is attached to the outer side
of the circle which is 7 o% of the diameter of the inner portion of the roll portion 9a; It is
characterized in that a heavy thin portion 16 is formed in a circular shape on the back surface.
The thick portion 16 may be formed by heating at the time of C.sub.2 heat molding 4 or may be
thinly formed at the time of paper making. Thus, providing the thin portion 16 of the pre-floating
portion near the peripheral portion of the diaphragm 8 causes the resonance caused by the
bending of the thin portion 16 of the pre-floating portion in the vicinity of 5 oo Hz to 1 o 00 H2,
As shown in FIG. 7, dips are made on the pressure frequency characteristics, and 500 tlz to 1.5
which occur when small diameter speakers of 10 to 201 are incorporated into a bookshelf type
box. The rise of the sound pressure frequency characteristic in the vicinity of sK) lz is eliminated
as shown in FIG. As described above, since the speaker of the present invention is configured, the
resonance frequency in the vicinity of 50o117 to 1ooO1'Iz can be controlled by providing the
thin portion on the front of the diaphragm, and it is extremely possible even if it is assembled in a
bookshelf type box. It can be made to have a flat name frequency characteristic, is easy to
manufacture, is excellent in shape retention as a diaphragm, and has the advantage of being able
to measure stabilization with a characteristic of 1 m without any variation, etc. It is a big thing of
five values.
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