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Motosada 54 Yukio Motomoto (2 others) Name '1 (582) Representative Matsushita Electric
Industrial Co., Ltd. Shoji Matsushita 4 Agent 571 Address Osaka Prefecture Kadoma City Oji
Kadoma 1006 Address 1 Bage Description ■ Japan Patent Agency ■ Japanese Patent
Application Laid-Open No. 51-361-230 Japanese Patent Application No. 51. (1976) 3.26 ■
Japanese Patent Application No. 47- / θ 0 in the agency's serial number '715 ベ ジ etc. 2 Vegs
The present invention eliminates the above-mentioned conventional drawbacks, but also the title
of the invention
Speaker device
3. Detailed Description of the Invention The present invention is intended to provide a speaker
apparatus in which a plurality of passive speakers are provided for 71 active speakers to enrich
the sound pressure at the bass limit. As a speaker device of this ear in the prior art, one passive
speaker is provided for one active speaker (woofer) to improve the bass range 7t. However, with
this configuration, the sound pressure at a sufficiently satisfactory bass limit can not be obtained.
Hereinafter, the present invention will be described with reference to FIGS. 1 to 4 of one
embodiment. FIG. 1 is a cross-sectional view 2 of the speaker apparatus, in which 1 is a box main
body, to which an active speaker 2 and two radical speech forces 3 and 4 are attached. In the
upper d self-active speaker 2, the frame 10 is coupled to a field section 9 comprising a plate 6
provided with a center ball 5, a ring-shaped magne, a door, and a ring-shaped upper plate 8 as
well. ART 1 to 7 of the back moving plate 11 is solid ATL, and a coil bobbin 13 in which the voice
coil 12 is wound around the center of the diaphragm 11 is coupled, the middle portion of the coil
bobbin 13 is held at 14 ° dumbar In the center of the upper surface of the reference numeral
11, a speaker for low frequency sound, that is, a woofer that is configured by sticking a dust
stern and a stick 16 in the center. The diaphragm 18 is fixed to the peripheral portion of the
frame 170 having the opening 16 at the bottom of the end plate: Endpage: 13 pages, and a coil
bobbin 1'9 as a weight is attached to the center of the diaphragm 18, This is held by the damper
20, and a dust cap is provided at the center of the upper surface of the diaphragm 18. 21 is
pasted and configured. An equivalent circuit of this configuration is as shown in FIGS. 2 and 3.
And each 1 straight will be shown by following Formula. (Driving force) FBe R R11: + 1ω LE
(voice co, impedance of ル 12) E (compliance of diaphragm 11 of active speaker) (ω O 2 2-tfo)
(resistance of the same diaphragm 11) (of the same diaphragm 11) Mass) (Opening resistance of
air of active speaker 2) (Compliance of box main body 1) (Opening resistance of air of passive
speaker 3) (Resistance of diaphragm 18 of same loudspeaker 3) + (Mass of diaphragm 1B) Page
6 (Same compliance) (B, opening resistance of air of shib speaker 4) (resistance of diaphragm 1B
of the same speaker 4) (quality t of the same diaphragm 18) (same compliance) 6-EndPage: 2T · ·
JP-A-51-36123 (3) In the above formulas, B: magnetic flux density of the magnetic gap, I! : &
Effective coil length of the coil 12, DC resistance of the R1 voice coil 12, Lm: inductance of the
voice coil 12, minimum resonance frequency of the fO near-active speaker 2, Q, M when
resonating the near-active speaker 2, Effective vibration system mass of the near-active speaker
2, R: mechanical resistance of the box body 1, ω: effective volume of the box 1, effective volume
of the main body 1, effective radius fo 11 of the diaphragm 11 of the near-contact speaker 2
Lowest resonance frequency of speaker 3, QMl: QH 1111 at resonance of passive speaker 3, c:
effective mass of vibration system of sib speaker 3, al: wave, effective radius of diaphragm 18 of
sib speaker, fo 2: sib speaker 4 (D lowest composite frequency, 0 M 2: 0% M 2 at resonance of
passive speaker 4: effective mass α 2 of vibration system of passive speaker 4: passive speaker 4
The effective radius of the provisional # 1a, γ: indicates the distance from the speaker device.
As shown in FIG. 4, the calculation results obtained from such a calculation formula are as shown
in FIG. As compared with this speaker device, the sound pressure becomes high near the bass
reproduction limit frequency, and the sound pressure at a lower frequency than that of the light
at the lower limit frequency becomes a sharp rho cart shape. It is also clear from the
experimental results that these tendencies show a tendency for the sealed-to-one, the bass
loudspeaker 1-t, and the two bass loudspeakers to be better than the one for the one sib-speaker.
○ As described above, the speaker device of the present invention enhances the sound pressure
at the bass limit to increase the practical value. 0 Further, by providing a large number of pas
and sipne bikas, the degree of freedom in design is also increased. <I think that the industrial
value is great, for example, it is possible to obtain the reproduction of the sound pressure that is
desired 9
4. Brief description of the drawings. FIG. 1 is a cross-sectional view showing an embodiment of
the speaker device according to the present invention, FIG. 2 is an equivalent circuit diagram,
FIG. 3 is an equivalent circuit diagram, and FIG. Is a sound pressure-time wave number
characteristic comparison diagram of FIG. 1 ...... box body, 2 ... ... active scan Bee 10 base -2I
force, 3.4 ...... bar, Sibu speaker. Name of agent Attorney Nakao Toshio et al. 1 person EndPage: 3
Fig. 3 f 4 f (Hz) Inventors and agents other than the above Moro mentioned above Name of
Ishihara Tadayoshi Ishihara Address Office (2) Agent I L Station Osaka Prefecture Kadoma City
Oji Kadoma LOO 6 EndPage: 4
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