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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
cone shaped speaker, FIG. 2 is a longitudinal sectional view of a cone shaped speaker of the
present invention, FIG. 3 shows a sound pressure single frequency characteristic diagram inside
the FIG. Figures 4 (a) and 4 (b) are diagrams showing the transient response inside the chamber
between the conventional one and the present invention, respectively. 1 is a diaphragm, 9 is a
chamber, 10 is a frame, and 11 is a subframe. In the drawings, the same reference numerals
denote the same or corresponding parts. Fig. 12 Flash -57 - Utility Model 52-49626 (2)
Mushroom 3 Calculation 4 Tomoe (^) 袷 r 1 (s 4! り(ト)@71(reリ−58−
DETAILED DESCRIPTION OF THE PROBLEM The present invention relates to a cone-shaped
speaker in which a chamber is formed on the back side of a frame, a subframe, and a vibration
plate. In general, a cone type speaker having a space portion between a diaphragm and a frame
has a space portion between the diaphragm (υ and the frame α 0, as shown in FIG. 1 and gives
it to the diaphragm Due to the vibrations. The internal sound pressure in the space becomes
abnormally high and cavity resonance as shown by the broken line in FIG. 8 occurs, and as
shown in FIG. 4 (at blue (11), vibration remains even after vibration of the diaphragm stops ,
There was a drawback that the transient response of the speaker itself was deteriorated. In order
to eliminate the drawbacks as described above, the present invention aims to provide a cone type
speaker which is provided with a chamfer and which can eliminate the cavity resonance by
utilizing the resonance caused by the chamber and the slit opening. Hereinafter, an illustrated
embodiment will be described. In Fang 2, (1) is a cone shaped diaphragm, and (5) is a voice coil
fixed to this diaphragm. f21, (31 is a damper and an edge holding the vibration system formed by
the diaphragm (1) and the voice coil (5) and uses a book of high compliance so that it can
reproduce to a low frequency. (4) is a cap, (8) is a play), (71 is a magnet, (6) is a pole piece and
(61 (71 (81 constitutes a magnetic circuit). (A) is a frame, and al is a subframe, which is attached
to the frame (2). (9) is provided between the frame (a) and the subframe (b) (2), and in the
chamber divided by the slit (2), the saliva, slits and the resonance of the chamber (9) are used
The resonance absorbed as shown by the solid line in Fig. 8 is generated on the back side of the
diaphragm owing to the sound absorbing action which has been done · · ·
the bead gap (11)
sweeping 41 Px 91 shaku - doppuku,. 71, Beef 1 / a. - was provided with the chamber (9) on the
back side of the diaphragm, the cavity resonance caused by the internal sound pressure
occurring on the back side of the diaphragm was removed by the resonance between Surin] (2)
and the chamber (9) As shown by bl, a speaker with a transient response can be obtained.
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jps5249626, description
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