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DESCRIPTION JPS5575399

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DESCRIPTION JPS5575399
Description of item 11 title of invention
Electro-mechanical converter
8. Detailed description of the invention The present invention relates to (2) EndPage: 1 to an
electro-mechanical converter such as a speaker apparatus for driving a movable part by an
electromagnetic force or piezoelectric power generated by the supply of an electric signal. In
particular, the heat generated in the movable part is effectively dissipated when a large input is
supplied. First, an example of a speaker device which is a representative example of an electromechanical conversion device will be described and its outline will be described. As a
conventional large input speaker type electro-mechanical converter, one as shown in FIG. 1 is put
to practical use. To explain this, (1) is a heat pipe containing a wick (2) inside, and a heat sink (3)
is connected to the end opposite to (2) inserted into the center ball (4). There is. (A voice coil (6)
is wound by a bobbin externally fitted to the 6 + i center hole (4). [71t81 is a ring-shaped magnet
(a yoke plate which constitutes a magnetic circuit together with 91). The screams are the cones
attached to the bobbin (II (2) (the damper that brakes ill, the OE is the cone (the edge of the river,
and the tip of each n is attached to the frame ? &). Since the conventional speaker type electromechanical conversion device configured as described above uses the heat pipe fi + having a
thermal resistance lower than that of any metal, the center ball (4) and the heat dissipation plate
ti11 The thermal resistance of the (6) has been reduced to a negligible level, but in the
conventional case, the heat pipe tl + is simply considered as a heat conductor with low thermal
resistance, Therefore, the voice coil (6, and the yoke 17r is less than the center ball (4), the air
layer which is a thermal insulator still exists in the dark of the center ball (4)). The value of the
final thermal resistance was not too low. Therefore, although the temperature of the center ball
(4) is lowered, cooling of the voice coil (6) of the target moving part is not improved. As another
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method, the voice coil (5i and the center ball f41 are A method of filling a magnetic fluid
consisting of a liquid with a low thermal resistance compared to air in the gap of the cabinet's
magnetic circuit, or a thermal conductivity of the liquid is higher than that of air, but it is
compared to a metal Because it is so small, it has not reached the point of significantly reducing
the thermal resistance between the magnetic fluid system and voice coil / yoke. In the present
invention, a small evaporation part of I [IIk is provided on a movable part such as a voice coil or
bobbin surface, and the heat of evaporation is collected by a fist which evaporates the liquid (4).
The heat resistance with the outside of the body is low, so that the # part of the large size part of
the electric mold # 3 V is released to the outside, and 3s of this condensation is released to the
outside. A cooling cycle, such as transport and re-evaporation, is continuously performed in the
closed vessel.
Thus, since the cooling is performed by evaporative slip heat, a lower thermal resistance can be
obtained compared to an electro-mechanical reconnection apparatus having a cooling device
utilizing sensible heat utilizing conduction, convection, and radiation, and thus a voice coil. And sI
& anti between yoke or a sender pole or an external heat sink etc. fall remarkably. Thus, the
present invention can provide an electro-mechanical conversion device such as a speaker having
a large input resistance. An embodiment of the present invention will be described below with
reference to the drawings. FIG. 2 shows a cross-sectional view of the first embodiment of the
present invention, which has a substantially axially symmetrical structure with respect to the
central axis (2). In FIG. 2, e211 is a voice coil which is made of an airtight material and is springloaded on the bottle (5) bin ? and driven in the center @ ??? j direction, and the outside is a
wick having a sheet-like capillary structure. Because it's scratching. (241 @ is voice coil t [and
wick's with the outside air! (1) A damper made of a shield material such as metal, and a wick
portion ??? ? made of a sintered body of metal fiber or the like is provided on the inner side
in contact with the wick @. 121i 1 (2) 1 is the eye c 111 no! There is a ring-shaped wick tee
attached to it, and the chopsticks are made of cylindrical sheet wicks mounted on the gear tube
surface of the yoke fall. cz is a link-like magnet, a center ball and a yoke, for example, a domeshaped nubika cone. The weight is a movable part t-t i closed container which is completely
disconnected from the outside air and includes a wick 1231 @ -? having a contact surface with
the 1il IU coil 1211 and a mutual contact surface. -Is a heat sink attached to the outer periphery
of the upper yoke Yoke @ 11-. [It I] Radiator summer, yoke @ 1 and wick @ metal over-pressure
switch mounted with an overpressure switch, with connection terminals to which input electrical
signals are connected. Next, the operation will be described. The inside of the vljijl'l container
[mu] s (6) EndPage: 2 shown in FIG. j82 is evacuated and then a certain amount of hydraulic fluid
is enclosed. This hydraulic fluid forms a state of wetting all the wicks by virtue of the capillary
action of the wick 01 (support) covering the inner wall surface of the closed vessel-. Therefore, it
is in the voice coil b state. Since the inside of the closed vessel (d) is saturated vapor pressure of
the liquid, the discharge of the voice-fill 121 by the input electric signal! ! 11 begins to evaporate
violently, the voice coil deprives the heat of evaporation more. This vapor is diffused mainly in
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the closed container-by the wick on the inner j1 surface of the yoke @ D where the heat
resistance with the outside air is low via the heat sink can. klaL ,, & release the end.
The NTh heat travels through the yoke made of a metal material having high thermal
conductivity and is released from the heat sink to the outside. On the other hand, the liquid that
has been transferred on the inner wall surface of the yoke @ I # is a disorderly closed pottery by
the inner wall Ifi of the gold, by the wick wicking up to the sheet wick O1 on the voice coil C1, u
mainly by capillary action. It is carried and evaporated again with the heat generation of the
voice coil 121 :. (7) With the above-described cooling cycle, it is possible to continuously
discharge the evaporation and condensation of the butterfly 9 and release the Joule heat of the
voice coil I2 phantom to the yoke C11 and finally to the outside. When the internal pressure of
the closed container exceeds the rated pressure value due to an excessive input electric signal,
the excessive pressure switch position cuts off the input electric signal connected to the terminal.
Therefore, the temperature of the gas in the closed container is lowered, the internal pressure is
lowered, and the damper I24I9B is prevented from being broken. As apparent from the above
description, the present invention utilizes heat transfer or evaporation passion due to
evaporation and condensation of the hydraulic fluid, and therefore, as compared with the
conventional voice coil cooling device utilizing sensible heat, The thermal resistance between the
voice coil and the yoke, that is, between the voice coil and the outside becomes a fist having a
much lower value. Also, even in the vacuum state, the pressure of the air applied to the damper
1241-K is good in the opposite direction and has the same size, and no repulsive force is applied
in the driving direction of the voice coil, and a delicate drive such as a speaker It also does not
affect the electro-mechanical converter that is being overwhelmed. (8) The above-mentioned
dormitory example shows a case where the inside of the complex is vacuumed in a sealed volume
and then a substance which is liquid at normal temperature is sealed, but it is not vacuum but not
normal temperature such as electricity. If the filling pressure is lower than the saturation vapor
pressure of the sealing liquid at normal temperature, boiling and condensation of the sealing
liquid occur at normal temperature, and the same effect is obtained. It goes without saying that it
is included in the invention. Next, even if there is neither S-fat nor k-ring at normal temperature
even if the pressure of the umbrella gas or the saturated vapor pressure of the enclosed liquid is
not mixed, the boiling point is reached with the temperature of the liquid of the voice coil partboiling but evaporation Needless to say, #) cooling is performed by the cycle of condensation,
and the same effect as the present invention can be obtained. Next 2nd! ??? An example will
be described. FIG. 6 is a top view and a cross-sectional view thereof, which has a substantially
axially symmetrical structure about a central axis-. In FIG. 3, the voice coil coil is wound on the
outside of a bobbin base made of airtight material, and the inside of the bobbin (2) is wound in
the direction of the wick of the sheet-like capillary structure.
Reference numeral 10141 is a ring-shaped damper made of a sealing material of a metal foil
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temple provided in the dark of the bobbin, the center ball and (9), and constitutes a ring-shaped
sealed container rlIo). It is covered with the wick ? in contact with the. 147 + tmt 491 is a ringlike and sheath-like wick that covers the outer wall of the center pole, and the inner wall of the
closed container is covered with all these wicks 41114a-. Numeral 6110- is a yoke similar to that
of FIG. 2, a ring magnet, a dome-shaped nubi to cacon, a yoke 1511 is a yoke connected to the
ring magnet, and 6z is a heat sink connected to the yoke 6 '. Next, the operation will be
described. As in the first embodiment, the cloth container is filled with a predetermined amount
of liquid after being vacuumed in advance. Then, the liquid is in a state of wetting all the wicks by
the capillaries of the wicks on the inner wall of the closed vessel. Therefore, due to the heat
generation of the voice coil 1211 which is the heat generating part, the working fluid of the wick
1411 is evaporated through the povin 1221 to receive the heat of evaporation. The steam is 1 #in a wig (10) EndPage: 3 [mu] s-) of the wall of the center pole whose heat resistance to the
outside is low via the heat radiation plate 63. Therefore, the heat of the voice film 1211 is
released to the outside from the heat sink 6z by completely the same operation as the first
embodiment. The main point of reciprocity with the first embodiment is that the evaporation
portion and the closed container are provided inside the bobbin (2). A sixth embodiment will now
be described. Fig. 4 (alfb) is the first view of the mountain, and a perspective view. ... Are the
same components as in FIG. 2 described in the first embodiment. b? is a metal tube having an
opening in a sealed container ?s through jI through a yoke set), the inner wall of the metal tube
tin is covered with a wick 1621 of a capillary structure having a contact surface at the whip, and
the other end is The heat sink 1 is connected. Next, the operation will be described. A vacuum is
applied to the inside of the sealed container (the top) and the metal tube fill, and then a certain
amount of liquid is enclosed, and all of the inner walls of the container are wetted with the
enclosed liquid. . When the voice coil 311 generates heat in this state, the working fluid
contained in the sheet wick (e) is evaporated and the heat of evaporation is poured from the
voice coil a. Most of the generated vapor condenses at 4 places corresponding to the heat sink
part connected with the metal pipe tiZK which is the part with the lowest heat resistance with the
outside, and the # bears the heat sink-the outside quickly by the heat sink Released into
On the other hand, the hydraulic fluid which has been shrunk is carried into the seat by the wick
? and evaporates again with the heat of the voice coil battle. The cooling cycle of evaporation
and condensation described above is continuously performed, and the heat generated by the light
emitting diode ff11 + is dissipated to the outside as in the first embodiment. As is clear from the
above description, the fifth embodiment has the same principle as the first embodiment, but
since the 11 kk portion and the heat dissipation plate are provided outside the speaker, the size
of the heat dissipation plate is the size of the yoke It is not limited to. Therefore, it is possible to
construct a small speaker having a very large number of heat sinks and capable of withstanding a
large capacity input, and the position t of the heat sinks can be set arbitrarily, for example,
outside the speaker box If you get rid of heat buildup inside the speaker box by installing the
heat sink, you will fall asleep. These effects can also be obtained, and a large-mouthed besbyker
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system using a very small loudspeaker box will also be possible. A fourth embodiment will now
be described. FIG. 5 is a cross-sectional view thereof, which has a central axis +7 (with
substantially an axial seal $ bridge to the central axis, FIG. 5 (b) is an A-A'lT view of FIG. 145 (a),
FIG. The figure ((+) is a rear view. As shown in FIG. 5 (turn), the part numbers i2B and ? are also
provided with the same configuration ** as FIG. 6 described in the second embodiment. q? is a fi
path having a cruciform in the sensor p-ball ?2t-A-Alal and an opening ? 3 in the closed vessel
1, and the passage ?? further wins the yoke 6 ? ? from the intersection of IiI ? cross Extends
rearward and communicates with the inside of the metal tube c19 connected to the heat sink
.sigma..sub.b, and all the inner walls of the force tube are covered with the wick CIe in contact
with the wick .chi. At the opening .sigma.3. The pressure adjustment plate .sigma.D sensitive to
the direction of the central axis .sigma. G with respect to the atmospheric pressure from the
thermal insulation material at the other end of the metal pipe .sigma.9 through the heat sink
t741 and the pressure adjustment chamber @ Is provided. The hot water is an interface between
the vapor and the inert gas at the time of operation of the cooling device within the passage ?,
and-is an arrow indicating the direction of the gas flow at the time of operation. {Circle over (3)}
is the contact point of the pressure sensing section, and the metal pipe {c) K is attached (16)
through the support section @B made of an electrical insulator. Next, the operation will be
described. Closed container-) and mW! r (The inside of 7D has been made to a pressure close to
the atmospheric pressure in advance by the inclusion of a fixed amount of inert gas such as
nitrogen), and then the fixed amount of hydraulic fluid is sealed, and all wicks 1411 orchid ~ The
four ? e are in the state of 6 cans of hydraulic fluid.
At unmanned power, the internal pressure at normal temperature is t 'by inert gas. 'The
atmospheric pressure is indicated, and the pressure wI4 adjustment plate ?? is kept at the
center position. Here, when the voice coil 1211 generates heat, the temperature of the hydraulic
fluid on the wick @ ?? inside the shibo pin turns start to increase due to heat conduction, and it
rapidly evaporates when it reaches the boiling point, and the heat of vaporization of the bobbin is
improved . When the internal pressure of the closed container-) is slightly increased by
atmospheric pressure, the vapor is at atmospheric pressure through the passage ? D-! It is sent
in the direction of 11 F 78, and the pressure m-x plate ? n expands in the direction of the arrow
1 to keep the internal pressure at atmospheric pressure. However, condensation of the steam
occurs by the heat sink ? 4 provided on the way, and the condensed working fluid is sent to the
wick 11 of the bobbin (4) through the wick 171t of the wall surface, and the evaporation is
returned again. (14) EndPage: 41. A gas flow is generated from the (closed container in
operation-as mentioned)-in the direction of the pressure regulation chamber ? &. In this case,
the gas flow of 'includes the working fluid vapor and the inert gas, and one working fluid vapor is
reciprocated in the gold single pipe ?S of the heat sink part, and the reverse of the arrow I in the
liquid phase It is transported in the direction, but the inert gas does not condense at normal
temperature, and there is no flow in the liquid phase in the reverse direction of the arrow-.
Therefore, the inert gas is pushed into the pressure 1114 chamber ?a and the metal pipe ?9
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one after another. On the other hand, the steam of the hydraulic fluid is generated one after
another on the surface of the bobbin 1411, and the movement of # 1 is completed at the heat
dissipation plate t741 part of the passage ? ??. Therefore, the boundary in (i'a of the inert gas
and the generated vapor is generated in the passage (in the portion of the radiator plate ?? of the
l?). When the heat input or the heat radiation amount of the heat radiation plate Cl41 is large,
the vapor pressure is high when the inert gas is pushed into the pressure adjustment chamber ?
иии, and the boundary surface moves in the direction of arrow ?. The area of stiffness increases
and the amount of heat release increases. At this time, the pressure control plate .sigma.D also
bulges in the direction of the arrow I, and the pressure car scratch chamber .sigma. Is maintained
near the atmospheric pressure. Conversely, when the heat input is small, the vapor pressure is
low, and the interface t71 between the vapor and the inert gas moves in the reverse direction to
the arrow-, and the pressure adjustment plate ? n is moved by the arrow- And C in the opposite
direction. When the heat input is large, the heat radiation amount increases, and when the heat
input is small, the heat radiation amount decreases. In this case, at the interface +79 between the
vapor and the inert gas, the pressure P1 on the vapor side is kept the same as the pressure of the
inert gas, that is, the atmospheric pressure. Actually, the heat sink .sigma.4 is larger than that in
FIG. 5 (a), and the thermal resistance to the outside is sufficiently low. Therefore, # contraction of
the hydraulic fluid takes place at the heat sink I portion of the metal tube 17e. Since the #
movement of the hydraulic fluid at this point can be ignored, the pressure in the closed vesselwill be equal to the vapor pressure of the hydraulic fluid at the temperature of the evaporation
section.
The pressure difference (P, -pl) between the pressure p in the closed vessel and the pressure at
the interface (P at 19) causes a vapor gas flow, and heat transfer by latent heat is performed,
Since the diameter of the flow passage in the hydraulic fluid evaporation part and the JIJI part is
enlarged to reduce mechanical resistance, the value of the pressure difference (Pg-Pt) is small if
the input electrical signal is within the rating. . And, as described above, since P is kept at the
atmospheric pressure value, it is kept near P,-atmospheric pressure. Therefore, the temperature
of the evaporation section can be maintained at a constant temperature, that is, within the
temperature range close to the boiling point of the working fluid at atmospheric pressure, and at
the same time the pressure of the evaporation section can be maintained at a range close to
atmospheric pressure as described above. . If an excessive heat input larger than the maximum
heat release amount is added, the internal pressure increases and the pressure control plate
surface or the tamper t 42 i 43 is destroyed. In order to avoid this, a pressure sensing S contact
consisting of two metal springs is provided, and a kami signal is connected to this, and as the
internal pressure increases, the pressure IIl @ plate ? ? ? is an arrow Progress in one
direction, release both contacts on the side, and cut off the input signal 41 m. So, voice coil? The
heat generation of U stops, the internal pressure decreases, and the speaker is prevented from
being broken. As described above, unless an excessive input is applied, the temperature of the
voice coil i2b is maintained substantially constant, and at the same time, the pressure of the
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closed container is also maintained near the atmospheric pressure. Therefore, the sealed
container does not necessarily require a high pressure resistance, and it is possible to use a more
flexible sealing material and to have a larger size and a larger damper size than the first
embodiment. The quaint, all conventional forms (17) ll +-g: shaped dampers can be used with a
slight & 'fE. Therefore, it becomes possible to apply the present invention to a planted speaker. In
addition, the closed container needs to be evacuated in advance, and only needs to be pierced
with an inert gas. Therefore, in the manufacturing process, the vacuum process does not occupy
a large amount of specific gravity, which has the effect of lowering the cost. Next, since the
temperature of the voice coil is kept constant, the heat resistance problem of the voice coil is
solved. In addition to the above, there is no other increase in the resistance of the voice coil at
the time of large input due to the temperature increase, and another effect of improving the
linearity of the input-output can be obtained. Also, when the input electrical signal increases and
reaches over the rating, the internal pressure rises and the input electrical signal is cut off
automatically by the film forming device comprising the pressure sensing S contact. Therefore, it
is possible to omit an external protection device such as a fuse which cuts off the input signal in
response to the excessive input electrical signal as in the prior art.
Even when the heat generated by the voice coil is smaller than the maximum heat release
amount, the pressure in the closed container-) (18) EndPage: 5 shows the temperature
characteristic of the saturated vapor pressure as it is. That is, with a slight increase in
temperature accompanied by a large increase in pressure, the damper (6) UK pressure may be
added and a burden may be imposed. Therefore, a groove is provided on the gap surface of the
center ball 0 to enlarge the steam passage, and by lowering the final thermal resistance between
the evaporation portion and the outside, a flexible damper for stools. Is also possible. In addition,
since a small amount of vapor is contained in the pressure Il adjustment chamber ? second in
addition to the inert gas, if I & move with the pressure m adjustment plate, the product IEll will
be biased to the opposite side of the evaporation section , The cooling cycle may stop. As a
countermeasure for this, in the fourth dormitory example, the pressure Iil adjustment plate ? 9
is made of a heat insulating material, but furthermore, as in the case of a known love
conductance type heat pipe, a wick is added to the pressure ms plate ? ?, It is also possible to
heat the pressure car control plate .sigma. By utilizing the heat of the voice coil or the heat of the
voice coil to make the hydraulic fluid which has been moved J.sub.L the evaporation section KN
or to prevent the .kappa. Further, the semipermeable membrane provided inside the pressure
adjustment chamber ?a can separate the vapor and the inert gas. In addition, the pressure
switch consisting of the pressure adjustment plate t / 71, the pressure sensing unit contact
phantom ???, and the support unit 1811 can increase the strength of the pressure switch) to
increase the strength of the pressure switch. The present invention is applicable to an apparatus
having a pressure tight container as shown in the embodiment. In that case, for an input
electrical signal that is larger than the rating, it is easy to prevent breakage of the device by
interrupting the multi-input electrical signal by inspecting the increased internal pressure. Ru. A
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fifth embodiment will now be described. Fig. 6) shows its 1 1 Ti 1, which has a nearly
axisymmetric structure with respect to the central axis-, and Fig. 6 (b) is its back III]. In FIG. 6 (a),
the 0-noodle of the part number is the same as that of FIG. 2 described in the first embodiment.
(A) is a metal pipe which penetrates a 3-way table and has an opening in a closed vessel-and the
other end is connected to a pressure control chamber @ having a pressure m1ll leveling plate.
The inside of the metal tube @ ? is covered with the wick field of the two capillary structure in
the opening (i) as well as the contact surface. Transport is at the metal pipe @ ? (The attached
heat sink,-is the interface between the vapor and inert gas during operation in the metal pipe ?
? as with the J44 application, and (() is the flow of vapor during operation Indicates -Is a
pressure sensing part attached to the upper base metal pipe (91 J, and its operation will now be
described.
In the same manner as in the fourth embodiment, the perforated vessel (d) and the inside of the
metal tube e11 and the pressure control chamber are previously pressurized to a pressure close
to the atmospheric pressure by the inclusion of a fixed amount of inert gas such as nitrogen.
After that, a certain amount of hydraulic fluid is enclosed, and all the wipecums 2.about.- inside
are wet with liquid. None-one is wet with liquid. The internal pressure at normal temperature at
unmanned force shows almost atmospheric pressure by the inert gas, and the pressure Iil
adjustment plate ? is in the state class maintained at the central pupil and f ?. Here, when the
voice coil 121 generates heat, the hydraulic fluid on the wick starts to evaporate, and as in the
fourth embodiment, the vapor flows in the direction of the arrow K, and the interface between
the vapor and the inert gas is emitted. Voice coil (constant temperature of 211 is made, sealed
volume 4 I! -The pressure approaches atmospheric pressure. In the pressure sensing unit, when
the internal pressure significantly increases due to excessive input, the input tm is cut off. The
59th! In the case of the example, since the evaporation is performed directly from the surface of
the bottom surface without using the bobbin 4, the voice coil (21) '? There is an effect that the
temperature distribution of 11 ?t и L (2) becomes more uniform, and an effect that it can also be
applied to a speaker with a damper side of 1 @. In the fifth embodiment, it is possible to sleep if
the internal pressure of the sealed container (mostly) is made much closer to the atmospheric
pressure by giving a margin to the thermal design. That is, the rear damper ?s and the rear wick
iron are removed over the entire circumference, sealing material is used for the dome-shaped
cone, and the dome-shaped cone and the center ball button are further formed in the space of the
front closing container Add space to make a new sealed container, of which! ?? The same
cooling cycle as in the fifth embodiment can be performed in this new closed container by
covering the surface with a wick). In this case, it is possible to use one damper ? ? ? as a
damper and to measure 5iltD simplified. In each of the embodiments, the explanation is given
with reference to the case where a part of the closed container is constituted by a damper, but an
edge as seen in a dome-shaped speaker device may be used as part of the closed container. In
addition, even if the capillary structure part is formed in the shape of a damper or an edge (22)
EndPage: 6 Furthermore, in each embodiment, the dimensional relationship of the drawings is
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different from the actual device in order to facilitate the explanation of the operation of the
cooling cycle. It has been scolded, but applicable to all real products. Also, although the domeshaped nubica has been described as an example of the electro-mechanical conversion device in
the embodiment, the same effect can be obtained even in the case of a cone-shaped speaker, a
horn-shaped nupeca or a flat plate speaker.
In addition, the application of the cutting head of the cutting machine of the record to the
electro-mechanical converter and the application of the head of the magnetic disk to the electromechanical converter can be easily realized. In addition, even for an electro-mechanical
transducer such as a large output ultrasonic wave generator having a vibration diaphragm, it is
easy to provide a hydraulic fluid evaporation portion on the diaphragm and easily provide the
hydraulic fluid 1Ik11 portion on the fixed portion. ! It goes without saying that what can be
realized. The wick of the capillary lLr1 may also be a slit or sintered type known in the art, or a
meshel or the like may be used, J [! It is also possible to provide the wire portion not at a fixed
portion such as the yoke, the center pole or the external heat radiation plate portion, but at a low
heat resistance with the cone portion and other external parts. Even in the evaporation section,
the voice coil must always have a bobbin, until it has a furless structure and is provided with an
evaporation section, a support made of a material with a small thermal resistance to the heat
resistance of the canine coil KII is attached and used as an evaporation section. It goes without
saying that the same effects as in the invention can be obtained. As described above in detail, the
present invention is intended to embed several good heats of the voice coil of the speaker on the
movable part of the electro-mechanical conversion device, specifically, to the outside by a low
thermal resistance. Therefore, a speaker with a large input type with a small voice coil which can
not be obtained by the prior art, a head for a record steering machine for a large input, a head
actuator of a head portion of a magnetic disk drive of a large heater, etc. And the potential for
new fields by increasing the output of the electro-mechanical converter.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the conventional example,
FIG. 2 is a -S view of the first embodiment, FIG. 3 is a cross-sectional view of the second
embodiment, and FIG. On the 1st, 1ll f [l [0] and its perspective view of the third embodiment,
FIG. 5 (at (b) (a) is 4'il! 1iLI figure of m cases and (a) K in ^ -Al11 + (! It is a IITIfi figure and its
rear view of an example of IIVuUK Seo (DifIf'FKJ, 14J61g (a) (b) uJI5 dormitory. Qll иии Voice fill,
Master ииии Bobbin, 0 ? ? и и и button, ? 1 и ((? f 49 163 (It B ? ? ? и wick, one elephant 1 ?-) и
и и,? D и и и и и и и и и и и и и и center ball, ? и и и и dome-shaped speaker cone, squeeze-и и и sealed
container, @ 6 'taOq 4 mountain heat sink, (1 & (и и и и и и pressure w4IIk Room agent Yoshihiro
Morimoto (25) Fig. 7 End Page: 7 Fig. J (2) Evening view (C) End Page: 9 Warning: Page
discontinuity
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