JPS52113636

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DESCRIPTION JPS52113636
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing a conventional
cone type dynamic speaker → FIG. 2 is an electrical equivalent circuit diagram of its mechanical
system, and FIG. 3 is a cone type dynamic speaker according to the present invention. -4 and 5
show frequency-electrical impedance characteristic curves of the cone type dynamic speaker
according to the prior art and the present invention respectively, and FIGS. 6 and 7 show the
prior art respectively. And FIG. 8 is a cross-sectional view showing the main part of many
examples of the present invention. 1 ...... fixing portion tall frame, 2 ...... corn, 4 ...... voice coil
bobbin, 5 ...... voice coil, 10 ...... damper Being
DETAILED DESCRIPTION OF THE INVENTION A conventional caged cone type dynamic speaker
is as shown in FIG. 1, (1) is a frame, (1m) is a lip of a frame (1), (2) is -No, (2 m) is the edge of sun
(2), (3) is a mount or Yap, (4 is a cylindrical bobbin, (5) is wound on this bobbin (4) and running
coil), +6) Center ball, +71 is a plate (annular), (8) is provided between the pole (6) and the plate
(7) + magnet (II permanent magnet 5),! I is a bone damper. The cone (2) is located at the edge of
the frame (11 at its edge (2 m) K, and the center part is the circumference 111 of the bobbin (4)!
Km will be attached. The bobbin (4) is separated from the pole (6), the plate (7) and the magnet
(8), and is connected to a part of the 7 frames (11 by a corrugation shape, that is, an annular
damper of concentric wave shape . The material of the damper r111 is a cotton cloth
impregnated with a thermosetting resin such as a phenol resin, and the mechanical loss line is
not large. The pole (6) is inserted into the bobbin (4), and the voice coil (5) is wound with the
pole (6) and the plate (7), and the friend bin (4) is wound slightly apart from each other The pole
(6), the plate ()) and the magnet (8) are integrated and fixed to a part of the frame +11. The
electrical equivalent circuit of the mechanical system of such a cone type dynamic speaker is
shown in FIG. Is a signal source of voltage IFV, and ZME is mechanical impedance (MK 811
machine Ω) depending on electric impedance of voice coil, hkttlFidi coil mass (辱) equivalent
inductance, Anu: mass of 7-n (kP) equivalent inductance, 1/1 8 M is the equivalent capacity of
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stiffness (N / ff1) of the whole vibration system,-is the mechanical resistance of the vibration
system (MK 8 (2) machine Ω), 2 dovetail μ is the equivalent inductance twice the radiation mass
(峙), 2 mm 11 radiation resistance (MK8 mechanical Ω) 2 倚 -t's, i +. Also, it is a mechanical
impedance of a vibration system which is a series impedance of ZMF1114gt, MMI, "/ 8 M,-." Fv
'is the end voltage of the series circuit of α due to the mechanical impedance due to the
electrical impedance of the signal source and the voice coil. The lowest resonant frequency f of
such an electrical equivalent circuit. Since 2-2 RMA <R 11 111 1 is omitted, −14 u + 2 M
hufo! -(R2) @ @ * @ toll12 pi. The mechanical resonance sharpness QM of the lowest resonance
frequency f0 is 2tf6 (MMI + MMg + 2MgH2) QM = @@@@@@@ (2) 8.
Furthermore, the total resonance sharpness including mechanical impedance 24 Ict according to
the electrical impedance of the mechanical impedance ZMK voice coil of the vibration system ((3)
ztfo (MMs 鳩 do u + 2 Mm) 賜 = (3) 2, + Bus N = Q M · □ [email protected] @ f 4) (A "/ RMI) + RI! となる。 Is
the electromagnetic braking resistance, AL force coefficient E (= BL; B is magnetic flux density, L
is the voice coil's long life) R1 is the sum of the DC resistance of the voice coil and the internal
resistance of the signal source. In general, in the equation (3), the electromagnetic braking
resistor 2 has a large mechanical resistance RMSZFJ length, and the mechanical resistance-is
ignored. 周波 数, the frequency f1 at which the effective value of the electrical impedance ZMK
including the mechanical system is halved before and after the real column value company fo of
QM. Considering f, at that point, the phase angle becomes moth, and r, -fl becomes -Sf, -f1 = -one-----addiction-1 (512? (MMI + 11412 + 2 MliA)). Accordingly, (4) fo2gfo ('MMx + pigeon is + 2
Mm) Qw = □ 冨 □ h-Is 1 # m · · · · · (6). Therefore, the QMO value can be obtained by measuring
(6), f, f, f, and nQo can be obtained by formula (4) if this QM is obtained. By the way, in the cone
璽 dynamic speaker, the minimum number of resonant peripheral fluids f in use. It is necessary
to make the resonance sharpness Q0 as small as possible so that the sound around the fluid
number f0 is particularly strong, and to prevent the transient characteristics from deteriorating
when the input terminal is suddenly cut off. . Such resonance sharpness Q. In order to reduce the
value of V, it has been practiced to increase the electromagnetic braking resistance in the prior
art (3). However, such electromagnetic braking resistance! A large size 2 requires a magnetic
circuit with extremely high magnetic flux density and a power amplifier with extremely low drive
source electrical impedance, and this is a factor that gives up the price of the speaker or the
electronic device equipped with the speaker. Become one of At the last point of the present
invention, the present invention is simple and inexpensive, and 5) is a dynamic loudspeaker with
a sufficiently sharp cone-to-peak dynamic speaker with a resonance sharpness Q0 of the lowest
resonance frequency f · in use. In the cone type dynamic speaker according to the present
invention, a coil bobbin or a portion of a coil bobbin or cone adjacent to this coil bobbin and a
fixed portion are connected by a damper having a large internal loss and a corrugation shape,
and a mechanical system of vibration system The resonance sharpness QM is reduced. BRIEF
DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail by means of an
embodiment example with reference to the drawing.
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First, one embodiment will be described with reference to FIG. 3. However, since this 纂 3
generally has substantially the same structure as that of FIG. 1 described above, only the main
part K will be described to correspond to FIG. The same reference numerals are given to the parts
and duplicate explanations are omitted. In this example, the damper weir. A material obtained by
impregnating a cotton cloth with a thermosetting resin such as a phenol resin is further
impregnated with a material having a large mechanical internal loss such as butyl rubber, vinyl
acetate, polyethylene double polymer, or the like, and impregnated. (6) Also, the shape of the
damper alI is an annular ring having a concentric wave shape like the damper weir in the 111th
embodiment. The outer peripheral edge of the damper 11 'is adhered to a portion K of the 7 lam
t1, and the inner peripheral edge is adhered to the outer peripheral surface of the bobbin 4
respectively. Next, respective frequency (Hz) versus electrical impedance (Ω) characteristic
curves of the conventional cone-shaped dynamic speaker shown in the first factor and the coneshaped dynamic speaker according to the present invention of FIG. And in FIG. In the case of FIG.
4, since fo, fl and f are 78 Hz, 67 Hz and 88 Hz, respectively, the mechanical resonance
sharpness Q 厘 of the lowest resonance frequency f0 is 078 QM = −− = 3.71 and hft 8 g −67!
Further, since the resonance ear e-17XZO ("h") = 100 Ω · RE = 6 Ω, the resonance sharpness
R16Qo at this time is Qo ′ ′ = QM ′ ′ = 3.71 × 0.223. In the case of Zo100 or 菖 5, fo, fl,
and fl are 84 Hz, 50 Hz, and 1431 respectively (since QM is (7) f 084 Q M −− = − = o, *. Since f
衾 -f, 143-50, and Zo = 24Ω, R 鳶 = 60, Qo at this time is R16Qo = QM ・ = 0.90X--0, 18Zo +
RC30. Therefore, in the loudspeaker of the example of FIG. 3 according to the present invention,
the mechanical resonance sharpness QM is largely smaller (about 1) as compared with the
conventional loudspeaker of FIG. In the loudspeaker of the example of FIG. 3 according to the
invention, the resonance sharpness Q compared to the conventional loudspeaker of FIG. It is
slightly less By the way, in the actual use condition, the resistance R1 changes according to the
condition of the electrical system connected to the speaker in charge of the use condition, and
the resonance sharpness Q according to the condition. Although it largely changes, since Qo is
originally Q0 M QM, if QM is selected sufficiently small, Q. It can be made small enough for 4 h.
Next, the conventional Learn-type dynamic speaker shown in FIG. 1 and the main Ij! Of FIG.
The same value of standing-flow drive voltage is applied to the speaker with the dynamic speaker
based on the (8) -type, and the change of the output sound pressure of the speaker with respect
to the step electric human power when cut into fish It is shown in FIG. 6, M7. In FIGS. 6 and 7,
each A shows a change of output sound pressure (in which the unit is not shown in 轡, but the
same size of the vertical axis shows the same output sound pressure) with respect to time (mlE)
fC. Also, in FIG. 6 and FIG. 7, each B shows the change of the input voltage to the speaker with
respect to time (msc), and this output sound pressure is detected in the anechoic chamber by the
microphone from the sound of the speaker. Measurement. 6 and 7, the cone type dynavitta
speaker according to the present invention shown in FIG. 3 has a vibration system more than that
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of the conventional Poon vote dynamic speaker shown in FIG. It can be seen that the transient
response is improved. According to the present invention described above, the vibration coil unit
is connected by a damper having a large mechanical internal loss and a corrugation shape
between the portion adjacent to the voice coil bobbin or the voice coil bobbin of the voice coil
bobbin or cone and the fixed portion having a corrugation shape (9) Since the mechanical
resonance sharpness QM has been reduced, the structure is simple and the value of the lowest
resonance frequency f in use is small, and the resonance priority Qo of the lowest resonance
frequency f in use is made small. There is no possibility that the transient characteristics may be
degraded or the transient characteristics may be degraded, and abnormal vibration or flicker of
the damper may be eliminated. (The linearity of the electro-mechanical conversion characteristics
may be increased in both the thickness direction and the surface direction of the damper. Thus, it
is possible to obtain a cone type dynamic speaker with good characteristics. Therefore, by
operating the present invention on a speaker such as a tape recorder, a small radio, a television
receiver, etc., it is possible to obtain a low price and good sound quality. According to the coneshaped speaker of the present invention, a speaker tube as shown in FIG. 1 of QM = 10 to 20, Q0
= 1.64, QM of 5 or less, Q0 of 1.411 K (F) X HEAKER ! You can In addition, when using a cone
type dynamic speaker according to the present invention for a multi-speaker system, it is
possible to simplify the LC @ path, which may lower the price of the system. As shown in FIG. 8,
the damper of the cone type dynamic narrow speaker according to the present invention to be
described above is a material 1 'having a large mechanical loss, such as natural rubber, synthetic
rubber, polymer material, etc., as a damper material (1G'). After sticking or applying B, it is
mourning even if it is made by pressing or thermoforming it into a predetermined shape. Also,
the damper may be mounted between the frame (1) as the fixed part and the portion of the cone
(2) near the bobbin (4) K.
Further, a separate mechanical loss damper may be added to the speaker shown in FIG.
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