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JPS5442540

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5442540
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional bass
loudspeaker, FIG. 2 is a chart of bass bass power according to the prior art, and a sound pressure
frequency characteristic of the loudspeaker according to the present invention, FIG. FIG. 4 is a
structural cross-sectional view of a speaker according to an embodiment of the present invention,
FIG. 4 is an encoded view of a vibrating body portion of FIG. 3 speaker, and FIG. 5 is a
mechanical system equivalent circuit diagram of FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · .... Sub damper.
DETAILED DESCRIPTION OF THE INVENTION The present invention is intended to provide a
speaker which can be used for wide area reproduction use as shown in FIG. . Hereinafter, an
embodiment of the present invention will be described in comparison with a conventional
example. First, the structure of a conventional bass loudspeaker and its representative il +?-Two
tone (O-like sound pressure frequency characteristic will be described. FIG. 1 shows a crosssectional view of a conventional bass speaker. (1) is a cone-shaped diaphragm, and a portion la is
fixed to a bobbin i2i made of kraft paper, aluminum or the like. Also, Hobin (2j has a voice coil
closed or wound. (1't 819 C. Each of the ferrite macnet, the plate, and the center ball forms an
insufflation circuit, and the diaphragm (l · is a twin damper (4, edge (6) so that the 75 inch coil
131 fits in the magnetic gap) It is supported by the frame 1'-1 from the frame. The twin damper
j4), the edge, and b are made of urethane or the like. The solid line in FIG. 2 shows the sound
pressure frequency characteristic of the speaker in FIG. 1. The sound Ilt produced by the
conventional speaker structure has a frequency aperture of 20 to 2 s (: m :) class and 1 (KHz: In
the vicinity of [-y, [Khz], a sharp peak is always generated. This steep peak is due to the high
frequency division coincidence of the diaphragm (1), and relates to the material and thickness of
the interlock & (1). In particular, in the case of a material having a small amount of internal
friction, such as a gold-plated cone diaphragm, the peak may reach as high as 20 [dB]. In order to
combine such a speaker with a dedicated high frequency speaker to form a multi-way speaker
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system, the configuration of dividing netsouk is complicated, which is also a factor of high cost.
Moreover, there are many cases where the overall sound pressure frequency characteristic as a
system can not be made satisfactory. Therefore, the present invention provides a speaker capable
of forming the speaker 7 summ with a simple idea work by suppressing the steep peak in the
high region, making the sound pressure frequency characteristic flat and expanding the use 0T
reproduction band. - Bs and aL & j show structural cross-sectional views of an embodiment of the
uninvented V-shaped speaker. In FIG. 3, the same parts as in FIG. 1 are assigned the same
reference numerals. (11, is a sub-damper of cloth or metal cage, with corrugation, or flat ring
shape. The sub-damper (one end of the sub-damper (11) is fixed to the throat portion of the
diaphragm (1, the throat of the sub-damper (11) through the sub-bobb 1101 made of kraft paper
or aluminum) In the vicinity of the upper end face portion of the voice coil bobbin (2) on which
the sub-bob 1 is wound, the sub-bobbin 1lol, the voice coil, and the Hin (2 (2 (fixed with each
other are coaxially arranged).
The tip end portion of the micromotion plate fil and the voice coil bobbin (2) are supported by
the edge 161 and main bar 1.4) as in the prior art. Therefore, the whole of 1kkl · 1), sub-bobbin
ill +: and pufthambers (1 + j and chopsticks, chair coil bobbins (2)) are supported by the main
damper (4) and the edge. FIG. 4 shows only the transmission body portion of FIG. 3 taken out and
the positions of the portions C are encoded. In FIG. 4, the inside of () shows each number of FIG.
Furthermore, the fifth diagram shows the mechanical equivalent circuit of the fourth section 1. 下
l Below, I will explain that the mounting beak of the conventional speaker can be increased based
on Fig. 5 and Fig. 5 again. In FIG. 5, the quality t of the (m +) l'i voice coil i31 and the voice coil
bobbin (2) (hereinafter referred to as the voice coil mass +, (C, Hrl) is seven). Compliance and
mechanical resistance of voice coil bobbin (2I and main damper (4), (0,) (r2) are each (4) subdamper (lli's compliance, mechanical resistance ( MMl is the mass of the diaphragm tl), (CM)
(RM) is the edge (compliance and mechanical resistance of 61 respectively, (RAI (MA) is the
diaphragm i1 respectively), the radiation resistance and the radiation mass (F) are voice coils ( It
is a driving force that works in 3). In the circuit of FIG. 5, etc., it can be seen that the highfrequency cutoff filter is constituted by the voice coil mass (ml), the compliance (C2) of the subdamper (11) and the mechanical resistance (r2). Therefore, the driving force is not transmitted to
the diaphragm 11 · in the high frequency band. (Ml) (C2), that is, the voice coil mass (ml) and the
compliance (C2) of the sub-damper (11) are appropriately selected as the continuous
characteristics, and the attenuation characteristics of 12αB 10 ut can be obtained from any
cutoff frequency . Therefore, while the sound pressure frequency characteristic of the
conventional slider shows the maximum peak near 2 ooo (Hz) in the solid line in FIG. 2, the
sound pressure frequency characteristic is the second when the cutoff frequency is selected near
x ooo [Hz]. (2) As shown by the broken line, it is possible to remove steep peaks in the high
region (6) 0 Note that in the above example, the sub-damper was fixed to the moving plate + l +
via the sub-bobbin 1lol. The same is true for the sub-damper l1l) Vi direct and direct moving
plate fixing. As described above, according to the present invention, the following effects can be
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obtained.
1) It is possible to flatten the sound pressure frequency characteristics by absorbing and
removing the steep heaters in the high frequency range which are found in conventional
loudspeakers, in particular, in high-frequency cone loudspeakers. (2) The degree of freedom in
the selection of the moving plate material purchase is greatly improved. (3) When configuring a
multi-way type speaker system in combination with a high sound speaker, the simple and easyto-use dipipe ink network is used and the umbrella and the network become inexpensive. (4)
There is no reduction in the sound pressure sensitivity of the conventional speaker.
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