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JPS5617792

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DESCRIPTION JPS5617792
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrodynamic speaker, and FIGS. 2 to 4 are cross-sectional views of an electrodynamic speaker
according to an embodiment of the present invention, and FIGS. The figure is a figure which
shows the temperature rise of the voice coil of the electrodynamic type speaker of a prior art
example and this invention. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Voice coil, 11 и и и ииииии Magnetic
fluid, 12.13 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Heat pipe , 17 ..... Heat sink, 18 .....
Transmission copper ring, 19.19 '..... Pipe, 20 ..... Pump ... 21, ..... Heat sink.
?Detailed description of the invention? Uninvented, voice coil temperature rise can be
practiced j "1. ',')) J'tifMXeo-'' 'revision 6 o' ta B 4 ░) turtle @ -1 evil is this kind of conventional
The y power supply shoe-has. In the first case, 1 is a yoke in which the center ball 27 '; "' T 2 2 is
integrally formed, 3 is an annular magnet fixed to the yoke 1, 4 is a massive yoke fixed to the
magnet 3 An annular magnetic gap is formed between the inner peripheral surface of the yoke 4
and the outer peripheral surface of the center pole 2. A frame 5 is fixed to the yoke 4. The frame
5 is supported by a flat plate diaphragm 6 or a massive edge member 7 in the hole of the frame
5. The flat diaphragms described above are core members of a finished lumi-honeycomb
material, and the front members are adhered to both surfaces of the core member. The reference
numeral 8 denotes a coil bobbin which is fixed on one side of the flat plate 6 by means of a plate
6 and has an air hole 9 formed in the coil bobbin 8. A voice coil 1 o is wound around a coil
bobbin 8. The voice coil 10 is located in the magnetic gap portion. 11 is a magnetic fluid filled in
the gap. When a voice signal is applied to the voice coil 10 in the male 1 figure, the coil bobbin
81 flat plate vibration plate 6 vibrates integrally and emits sound. When a large input Q710 is
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applied to the voice coil 1 ░, the voice coil 1o is fired. The heat of the voice coil 10 is
transmitted to the yoke 4 or the center ball 2 through the magnetic fluid 11 in contact with the
voice coil 10 and dissipated. As a result, the temperature rise of the voice coil 10 is reduced, the
input resistance of the speaker increases, and the maximum output sound pressure increases.
The magnetic fluid 11 is a non-volatile solvent in which fine particles obtained by coating the
surface of ferromagnetic fine particles having a diameter of 300 ┼ or less such as F'e 304 with a
surfactant are dispersed in a colloidal state. Generally, hydrocarbon, water, kermine, etc. are used
as the dispersion solvent for the 0 magnetic fluid which is attracted and held in the air gap while
the ferromagnetic fine particles are attracted to the surrounding dispersion solvent by the
magnetic field in the air gap. Materials such as liquid paraffin, fluorocarbon, ester oil, mineral oil,
etc. are used, but for speakers, ones that have high reliability against heat generation of a pois
coil and high mechanical resistance against vibration are required, and low vapor pressure is
required. The solvent with low viscosity is good, and naturally the thermal conductivity is good.
Practically, it is believed that the vapor pressure is low, and in order to give top priority to Th
reliability, high knee and grade fatty acid esters such as diesters are used.
The ester is obtained by reacting and esterifying a ? and a ? 4 alcohol, and the combination of
the acid and the alcohol can synthesize an ester having various properties, so the degree of
freedom in selection is large. For example, as a diester having two ester bonds which are known
as lubricating oils for aviation equipment, sebaci / dioctyl dioctyl C8 H, OOC (CH2) 8 COOC 8 H,
7 (melting point-55 ░ C, vapor pressure 4 mm) Ig warm # 248 ░ C, viscosity 19-9 centipoise) or
diisooctyl azelate H, C 800 C (CI (2), C 00 C 8 I, (melting point-40 ░ C, vapor pressure 5
exposure Hq temperature 237 ░ C, viscosity 20 centipoise) or There is an adipate version of
diisooctyl (cohesion point -70 ░ C, temperature 215 ░ C of vapor pressure 4I + 11nHq,
viscosity # 17.7 centipoise), etc., and the vapor pressure is low even at high temperatures and the
reliability is high. The viscosity is a viscosity at 20 ░ C. The above three examples are expressed
by molecular formulas: dioctyl sebacate C26h5oO4, azelate diisooctyl C25H4804, adipinic diyne
octyl C22h 4201 (with a large number of di carbons) (10 particles) fatty acid and higher alcohol
reacted, and all The boiling point is between 300 and 400 ░ C., which is higher than that of
silicic acid 5 ester and lower than the vapor pressure. The melting point is 40 ░ C to -70 ░ C
and it can be used in cold regions. In such esters F in the presence of surfactants such as oleic
cough and oleic enemy sodium. 304 When grinding with a ball mill etc. at full length h, the
carboxyl group of the surfactant is immediately adsorbed on the surface of Fe 304 finely divided
by grinding, and the same fatty chain is coated on the outside to prevent reaggregation of fine
particles, As milling progresses, F, 304 begins to disperse in the ester in a colloidal manner. F (13
Qa coarse particle size, thick, with a centrifuge after the progression of micronization of a certain
moss? If particles with a diameter of 300 ┼ or more are removed, a magnetic fluid that does not
aggregate or settle under gravity even in a high-intensity research site as a speaker can be
obtained. The vapor pressure and bond point of this French fluid are determined by the ester,
which is a dispersion medium. Also, is the particle size of the coating thickness of the surfactant
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in the magnetic fluid and the dispersion solvent? The viscosity is higher than that of the
dispersion solvent determined in the 71st term viscosity, and it is often used that has a viscosity
of 76 to 1000 centistokes, a low viscosity of 51 to 200 centipoise, or a low viscosity of 51 to 200
centipoise. The magnetic fluid 11 for use is often dispersed in a high-boiling low-vapor pressure
ester such as a diester as described above in the form of a colloid of all ferromagnetic powders
having a diameter of 300 ┼ or less.
The thermal conductivity of such a magnetic fluid is relatively small as 0.1 to 0.1 J / mw 0 K as a
liquid, and the thermal conductivity of water is 0.677 m, 5 cc C 1 K, V 6-'yi? ??? However,
even in the conventional electrodynamic speaker shown in FIG. 1, the heat radiation effect is not
light. Therefore, the present inventor has already proposed a speaker of umezuke illustrated in
FIG. 2 to FIG. The electrodynamic speaker uses a magnetic fluid and a heat radiation fluid having
a thermal conductivity larger than that of the magnetic fluid. In FIG. 2, 12.13 is an annular
groove formed on the outer peripheral surface of the center pole 2 and the inner peripheral
surface of the yoke 4 respectively, and the magnetic pole forming the magnetic gap is divided by
the groove 12.13. The magnetic fluid 11 is filled on the diaphragm side of the gear) tab. A heat
dissipation fluid 14 is filled in a space in the magnetic circuit surrounded by the yoke 1, the
center pole 2, the magnet 3, the yoke 4 and the magnetic fluid 11. The heat dissipation fluid 14
is a magnetic fluid 11. Because the heat conductivity is better, and the heat radiation fluid 14 is
in direct contact with the voice coil 10, the speaker shown in FIG. 2 is closer to the heat radiation
effect than the speaker shown in FIG. 2 is a further improvement of the speaker of FIG. 2; 15 is a
heat transfer copper ring disposed at the inner peripheral surface of the Nippon Steel 3; 16 is a
heat transfer Th1 IJJ song 5; A heat vibrator inserted and fixed inside is a heat sink 17 provided
at the other end of the heat vibrator 16. In FIG. 3, the heat generated by the voice coil 10 is also
dissipated from the heat dissipation plate 14, the heat transfer fluid 14, the heat transfer MIJ
ring 15, the heat vibrator 16 and the heat dissipation plate 17. FIG. 4 shows still another
example, in which 18 is a heat transfer steel ring arranged in a space in the magnetic circuit, and
the heat radiation) fluid 14 is joined by blocking the pipe 19.19 ', The "recirculation by the pump
20" dissipates heat from the radiator plate 21 attached to the pipe 19 '. The characteristics
required for the magnetic fluid and the heat radiation fluid in the above-described
electrodynamic loudspeaker are as follows. (Al two fluids do not react, there is no compatibility,
and the sealing function of the heat dissipation fluid by the magnetic fluid does not deteriorate.
(It is a low viscosity fluid. It does not disturb the vibration of voice coil and coil bobbin. (Q In
particular, the vapor pressure of the magnetic fluid is low, and the viscosity due to the
evaporation of the magnetic fluid is high. Screaming freezing point is low, even at low
temperatures. (E) High thermal conductivity, effectively transmitting the heat of the voice coil.
Use a magnetic fluid of CF + high saturation flux density.
As described above, a magnetic fluid having an ester oil such as a diester having a long chain
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structure as a dispersion solvent is currently most suitable for a speaker. When this magnetic
fluid is mixed with hydrocarbon (hydrocarbon) or a solvent of the form, benzene block
compounds such as benzene, toluene and toluene, halogen compounds such as carbon
tetrachloride and methylene chloride, and hydrocarbons such as 9 of n-hexane or 2 It dissolves
uniformly with most solvents such as higher alcohols such as Octatool or petroleum ether, liquid
paraffin, esters and the like. This is a dispersion fluid of ferrofluid, which is a dispersion solvent
of magnetic fluid, and the above-mentioned bath agent compatibility, and Fe3O4 is a long chain
mechanism of surfactant such as oleic acid which is in the form of colloid and the above solvent
It is because there is affinity. The aggregation and white turbidity phenomenon of Fe3O4 which
mixes solvent, such as acetone, methyl alcohol, ether alcohol, methyl ethyl ketone etc., with the
said magnetic fluid can be seen. This is considered to be a phenomenon that occurs because the
higher fat is compatible with the above-mentioned bath agent such as ester and acetone, but the
surfactant does not have affinity with the above-mentioned solvent. When various liquids are
mixed with a magnetic fluid containing higher fatty N ester as a dispersion medium, there is no
compatibility, and as a liquid that does not cause aggregation of Lloyd Fe rho 4 microparticles in
the co-VL & liquid fluid when two-phase separation occurs, water, We found glycol and glyceryl
silicone oil. G) Recall is a three-ring alcohol having a molecular structure which has a molecular
structure having two water-based groups and has a molecular structure of 21 ? ? ? ? near #
f?I?D ? or 0 * 91 ░. Water has a low boiling point of 100.degree. C. and a high freezing point
of 0.degree. C. and is therefore not practical because it is easy to evaporate and freeze in cold
regions. On the other hand, glycols such as ethylene glycol (boiling point 198 ░ C, freezing point
-13 ░ C, viscosity 21 centipoise), diethylene glycol (boiling point 245 ░ C, freezing point -8 ░
C, viscosity 21 centipoise), triethylene glycol (boiling point 287 ░ C. Freezing point -7 ░ C,
viscosity 48 centi-poison, propylene glycol (boiling point 187 ░ C, freezing point -60 ░ C). 56
centipoise), and the steam pressure is low. The viscosity which does not solidify at 0 ░ C. 01 is
also lower than the viscosity of magnetic fluid at 75 to 1000 centipoise. A typical example of
glyceryl is glycerin (boiling point 290 ░ C., freezing point 18 ░ C., viscosity 945 centipoise), but
in any ratio with water and glycol, the bath has a combined viscosity of 50 centipoise or less and
freezing point O ░ C. or less It is possible to make. In addition, the bath is suitable for glycol and
water at an arbitrary ratio.
The thermal conductivity of glycol and glyceryl is smaller than that of water, but the thermal
conductivity of magnetic fluid with higher fatty acid ester dispersed is greater than 0.1 to 0.161 /
m, Sec and cIC, and the heat dissipation effect of voice coil is also available Improve. The thermal
conductivity at 50 ░ C. is ethylene glycol: l, o: 26 J / m 2. ?????????????
??????????????????????????????????????????
????????????????????????????????????????
????? ????? In addition, the mixed solution of ethylene glycol 80% and water
temperature is 0.311 / in, sec, ball, and the heat conductivity increases as the water resistance
increases, but the heat conductivity increases. The bottom 9 freezing point rises and approaches
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0 ░ C. That is, it does not show intermediate properties between water and ethylene glycol.
Silicone oil has approximately the same thermal conductivity as the magnetic fluid. FIGS. 5 and 6
are graphs of a 20-second sine wave for a tweeter with a voice coil diameter of 25 mm and a
voice coil temperature rise with respect to the effective input W. In the conventional example
shown in FIG. The heat of 1, B, C and D was used as the heat radiation fluid 14 in the rolling of
the embodiment shown in FIG. 4 B (20 centipoise silicone oil) and C (water) were used in addition
to V1 (V) If the characteristics of the case, B, C, D in FIG. 5 stop the pump 20, and B, C, D in FIG. 6
operate the pump 2o, reflux at a flow rate of 4 to rscc / sec. It is the characteristic when it is
made to do. B and C of FIG. 5 in which the fluid 14 for heat release was stopped. The
characteristic of D is substantially the same as the result of the measurement in the 31: J + 7)
embodiment. C (water) has low reliability but high thermal conductivity, and B (silicon oil has
poor reliability but low thermal conductivity. h When it is allowed to flow, ethylene glycol shows
almost the same rise in voice coil temperature as water in the 61st weir, and it can be seen that
the heat transfer coefficient at the interface between voice coil and flowing ethylene glycol is as
large as water ? It is considered that because the intermolecular force between the voice coil
and coil bobbin and ethylene glycol is relatively large, it is easy to transmit the thermal
movement of the molecule. As described above, high-fat 'J' Syx 7 pieces 2.1 sealed ?, 1 part
5.74. ?? ? A mixed solution of glyceryl and 7f and water, and having a relatively high 13boiling point using a fluid for heat dissipation that solidifies at a temperature of 0 ░ C or less,
and is sealed by a voice coil or coil bobbin and a contact pin-tr, n The effect is large and low
viscosity, and the voice coil temperature sales increase can be reduced to V3 of the conventional
example shown in FIG. 1, so that mechanical resistance to vibration of the voice coil is small and
sound pressure reduction is also small.
In addition, second one. In the embodiment shown in FIG. 3, it is also possible to use a magnetic
fluid containing, as a heat dissipating fluid, a mixture of glycol, glyceryl, and 7 straw polyalcohol
and water as a dispersion solvent. According to the present invention, the speaker of the present
invention is the above-mentioned fnBat, and due to unthinking, the temperature rise of the voice
coil can be reduced, and the highly reliable electrodynamic speaker has an advantage to be
obtained It is. Fig. 1 is a cross-sectional view of a conventional electrodynamic speaker, and Figs.
2 to 4 are cross-sectional views of an electrodynamic speaker according to an embodiment of the
present invention, Fig. 5 FIG. 6 is a diagram showing the temperature rise of the voice coil of the
conventional %% unconventional M% i??M speaker. 141 иии Yaw, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и diaphragm и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Voice coil, 11 и и и magnetic fluid, 12.13 и и и
sea, 14-и и и и и и Heat dissipation fluid, 15 и и и Heat transfer silver ring, 46 и и Heat pipe, 17 и и и Heat
dissipation plate, 18 и и и Transmission steel ring, 19.19 'и и и Pipe, 20: Pump, 21: Heat sink.
Alternate name Patent attorney Toshio Nakao et al. 1 person Fig. 431 I 2 O Fig. 3 Iq,-I 418 ',
name of the representative of the exsistence agent '26 ? 72 ? 317 T 92 Toshio Nakao et al. 1
person Fig. 3 H 17173 I ? j 158 t 41 ? 2 ? 3 4 Fig. 35-19 'Qllo ? q-и X'-pa 19 и -8 2 l ? I 3 1
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79 2 My agent Mr. Toshihisa Nakao et al. 1 и anal / / v 60. , P + ? 7. ) и и и / / @ / '?' ? ? и и и и и и
/ / / 'p / / 10Cl / / "" 20v, / / / / / 1 ? 102 030 effective ? force (W ) 1 '?' Name of attorney,
Toshio Nakao et al. B off le bel, . Le Togami ? ,, '' Ha l l kei q 'C. ????? 'I' 01 (It2030 real
kunfu on) 7 (141) '177 ? 92 ? agent Mr. Narube Toshio Toshio other 1 person Miro other
agent address other than Osaka Prefecture Kadoma city Ogata Kadoma 1006 address Matsushita
Electric Industrial Co., Ltd. 1, name of the citizen (6152) patent attorney Shigeno Hagino 1 ? :, 1
'Sci'-Miyoru / / / non-professional
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