TWI385641B - Sound device - Google Patents

Description

Sound device

The invention relates to a sounding device, in particular to a thermoacoustic device based on thermoacoustic effect.

The sounding device includes a sound generating element that generates sound waves, and the sounding device drives the sound emitting element to emit sound waves after receiving an external signal. Previous sounding components, such as electric, electrostatic, and piezoelectric, mostly use diaphragm vibration to emit sound, and the vibration of the diaphragm requires a driving device, so the structure of the previous sounding device is complicated.

Fan Shoushan et al. published a thermo-acoustic device on October 29, 2008, which uses a thermo-acoustic component. See the literature "Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers", Fan et al., Nano Letters, Vol. 8 (12), 4539-4545 (2008). The thermoacoustic element is fabricated using a thermoacoustic principle using a carbon nanotube structure having a large specific surface area and a very small heat capacity per unit area. After receiving an external signal through at least two electrodes, the carbon nanotube structure rapidly exchanges heat with the surrounding medium, thereby changing the density of the surrounding medium to emit sound waves, and the intensity and sounding frequency of the sound wave are perceived by the human ear. The scope.

However, the thermo-acoustic element generates heat radiation during heat exchange with surrounding medium molecules, thereby causing the temperature of the thermo-acoustic device to be too high, thereby affecting the use of the thermo-acoustic device.

In view of this, it is necessary to provide a thermo-acoustic device having a heat dissipation function.

A thermo-acoustic device includes a thermo-acoustic component, at least a first electrode, and at least a second electrode. The first electrode and the second electrode are disposed in parallel and electrically connected to the thermo-acoustic element. The thermo-acoustic device further includes a heat sink. The heat sink is opposite and spaced apart from the thermo-acoustic element.

A thermo-acoustic device comprising: a thermo-acoustic element; a plurality of first electrodes and a plurality of second electrodes disposed in parallel and alternately spaced apart, the thermo-acoustic element being laid and electrically connected to the plurality of first electrodes And a plurality of second electrodes. The thermoacoustic device further includes a heat dissipating device, the thermo-acoustic device is spaced apart from the heat dissipating device, the heat dissipating device includes a base, a plurality of heat pipes and a plurality of heat sinks, wherein the heat pipe is fixed at the In the pedestal, the plurality of heat sinks are fixed in parallel to the plurality of heat pipes in equal parallel.

In contrast to the prior art, the thermo-acoustic device is provided with a heat sink on one side of the thermo-acoustic element. The heat dissipating device absorbs the heat emitted by the thermo-acoustic element and dissipates the absorbed heat to the outside, thereby reducing the ambient temperature during operation of the thermo-acoustic device and improving the service life of the thermo-acoustic device And work efficiency.

Hereinafter, a thermo-acoustic sounding device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, a first embodiment of the present invention provides a thermo-acoustic device 10 including a signal input device 12, a pyrogenic component 14, a first electrode 142, a second electrode 144, and two supports. The body 16 and a heat sink 18. The thermo-acoustic element 14 is disposed on the heat sink 18 through the two supporting bodies 16 and forms a space with the heat sink 18, and the signal input device 12 is disposed on the thermo-acoustic element 14 through the wires 149 and the like. The upper first electrode 142 and the second electrode 144 are connected. The specific structure of each component of the sounding device 10 will be briefly described below.

The heat sink 18 includes a base 185 and a plurality of heat sinks 188. In the present embodiment, the base 185 is a flat plate structure including a first surface 184 and a second surface 186 opposite the first surface 184.

The susceptor 185 may be made of a material having good thermal conductivity and weak absorption of far infrared rays such as metallic copper, aluminum, or the like. The area of the pedestal 185 can be set according to actual needs as long as it is not smaller than the area of the thermo-acoustic element 14. For example, the pedestal 185 may be a copper plate; preferably, the thickness of the copper plate may be in the range of 1 mm to 5 mm, so that the heat dissipation requirement of the sound absorbing device 10 as a whole can be satisfied, and the overall size of the sound absorbing device 10 can be reduced. The thickness of the sound generating device 10 is made lighter, and the cost of the sound generating device 10 as a whole can be reduced by controlling the thickness of the copper plate. Since the susceptor 185 is formed by using a copper plate having a weak absorption of far infrared rays in the embodiment, the far infrared rays emitted by the thermoacoustic element 14 during operation are not all absorbed by the susceptor 185, so that the pedestal 185 does not The temperature is too high due to excessive heat absorption.

The heat sink 18 further includes a plurality of heat sinks 188 disposed on the second surface 186 of the base 185 . The heat sink 188 is a metal sheet, and the metal material is an alloy of one or more of gold, silver, copper, iron, and aluminum. In this embodiment, the heat sink 188 is a copper sheet having a thickness of 0.5 mm to 1 mm. The plurality of fins 188 may be secured to the second surface 186 of the base 185 by bolts or soldering. The heat sink 188 may also be integrally formed with the base 185 to be formed on the second surface 186. The heat sink 188 can dissipate the heat emitted by the thermo-acoustic element 14 during operation to the external environment.

The support body 16 is spaced apart from the first surface 184 of the base 185 to provide support to the thermo-acoustic element 14. The support body 16 may be adhered to the first surface 184 by an insulating glue or may be fixed to the first surface of the base 185 by bolts. The shape of the support body 16 is not limited, and any object having a certain shape as long as the object can support the thermo-acoustic element 14 can be used as the support body 16 in the first embodiment of the present invention. The material of the support body 16 is an insulating heat insulating material and may be a hard material such as diamond, glass or quartz. The material of the support body 16 may also be a flexible material such as plastic or resin. When the area of the thermo-acoustic element 14 is increased, a plurality of support bodies 16 may be disposed at equal intervals in parallel on the surface of the heat sink 18. In this embodiment, the support body 16 is a rectangular parallelepiped and is made of quartz. The direction in which the plurality of fins 188 are arranged in FIG. 1 is the length direction of the thermo-acoustic element 14, and the plurality of fins 188 in FIG. 1 are arranged in the width direction of the support body 16, and the length of the support body 16 is greater than It is equal to the width of the thermo-acoustic element 14, so that the thermo-acoustic element 14 can be stably disposed on the support body 16.

The thermo-acoustic element 14 is laid parallel to the base 185 and laid on the support body 16. The area of the thermally audible element 14 is comparable to the area of the first surface 184 of the pedestal. The thermo-acoustic element 14 provides support through the support 16 and is spaced from the first surface 184 of the pedestal 185. The sounding element 14 can be fixed to the support body 16 by an adhesive. The thermoacoustic element 14 is a thermoacoustic element that vocalizes using the thermoacoustic principle. The thermoacoustic element 14 has a large specific surface area and a small heat capacity. Generally, the thermoacoustic element 14 has a heat capacity per unit area of less than 2 x 10 ^-4 joules per square centimeter Kelvin. Preferably, the thermo-acoustic element 14 is a carbon nanotube structure formed of a plurality of carbon nanotubes, and the carbon nanotube structure has a heat capacity per unit area of 1.7×10 ^-6 joules per square centimeter Kelvin.

The carbon nanotube structure has a layered, linear or other shape and has a large specific surface area. The carbon nanotube structure comprises at least one carbon nanotube membrane, at least one nanocarbon line-like structure, or a combination thereof. Specifically, the carbon nanotube structure may include a plurality of carbon nanotube membranes that are laid in parallel and/or overlapped without gaps. The carbon nanotube structure may comprise a plurality of nanocarbon line-like structures arranged in parallel, crosswise or woven in a certain manner. The carbon nanotube structure may also include at least one nanocarbon line-like structure disposed on the surface of the at least one carbon nanotube film. The plurality of nanocarbon line-like structures may be disposed in parallel, crosswise or woven in a certain manner on the surface of the carbon nanotube film. The thickness of the carbon nanotube structure (the diameter in the case of a linear structure) is 0.5 nm to 1 mm. Preferably, the carbon nanotube structure has a thickness of 0.5 microns. The carbon nanotube structure may have a heat capacity per unit area of less than 2 x 10 ^-4 joules per square centimeter Kelvin. Preferably, the carbon nanotube structure has a heat capacity per unit area of 1.7 x 10 ^-6 joules per square centimeter Kelvin. The carbon nanotubes in the carbon nanotube structure include one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5. Nano ~ 50 nm.

The carbon nanotube membrane comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are tightly bonded by van der Waals force. The carbon nanotubes in the carbon nanotube film are disordered or ordered. The so-called disorder means that the arrangement direction of the carbon nanotubes is irregular. The so-called ordering means that the arrangement direction of the carbon nanotubes is regular. Specifically, when the carbon nanotube structure includes a disordered arrangement of carbon nanotubes, the carbon nanotubes are entangled or isotropically arranged; when the carbon nanotube structure includes an ordered arrangement of carbon nanotubes, The carbon nanotubes are arranged in a preferred orientation in one direction or in a plurality of directions.

The carbon nanotube film comprises one or more of a carbon nanotube film, a carbon nanotube film, a carbon nanotube film, and a long carbon tube film. The carbon nanotube film comprises a plurality of substantially parallel carbon nanotubes arranged in a preferred orientation along the same direction. The carbon nanotube rolled film comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are isotropic and arranged in the same direction or in different directions. The carbon nanotube flocculation membrane comprises intertwined carbon nanotubes. The carbon nanotubes are attracted and entangled by van der Waals forces to form a network structure. The carbon nanotube film is isotropic. The carbon nanotubes in the carbon nanotube film are uniformly distributed and randomly arranged to form a large number of microporous structures having a pore diameter of less than about 10 μm. The long carbon nanotube film comprises a plurality of carbon nanotubes arranged in a preferred orientation. The plurality of carbon nanotubes are parallel to each other, arranged side by side and tightly coupled by van der Waals force. The plurality of carbon nanotubes have substantially equal lengths and may be of the order of millimeters in length. The length of the carbon nanotube film can be equal to the length of the carbon nanotube, so at least one carbon nanotube extends from one end of the carbon nanotube film to the other end, thereby spanning the entire carbon nanotube film.

In this embodiment, the thermo-acoustic element 14 includes at least one nano carbon tube film laid on the support body 16, and the carbon nanotube film includes a plurality of substantially parallel carbon tube edges. The same direction is preferred. Preferably, the carbon nanotube film comprises a plurality of substantially parallel carbon nanotube tubes extending from the one support body 16 toward the other support body 16 in the axial direction thereof.

Referring to FIG. 3, the carbon nanotube film has a thickness of 0.01 micrometers to 100 micrometers. The carbon nanotube film is directly obtained by drawing a carbon nanotube array. The carbon nanotube film comprises a plurality of carbon nanotubes arranged in a preferred orientation, and the carbon nanotubes are connected end to end by Van der Waals force.

Referring to FIG. 4 together, in particular, each carbon nanotube film comprises a plurality of continuous and aligned carbon nanotube segments 143. The plurality of carbon nanotube segments 143 are connected end to end by Van der Waals force. Each of the carbon nanotube segments 143 includes a plurality of mutually parallel carbon nanotubes 145 that are tightly coupled by van der Waals forces. The carbon nanotube segment 143 has any width, thickness, uniformity, and shape. The carbon nanotubes 145 in the carbon nanotube film are arranged in a preferred orientation in the same direction. It can be understood that the carbon nanotube structures of different areas and thicknesses can be prepared by laying a plurality of carbon nanotube films in parallel and without gaps laying and/or overlapping laying. When the carbon nanotube structure comprises a plurality of stacked carbon nanotube films, the arrangement direction of the carbon nanotubes in the adjacent carbon nanotube film forms an angle β, 0 ̊ ≤ β ≤ 90 ̊ . The multi-layered arrangement of the carbon nanotube membranes, especially the multi-layered interdigitated carbon nanotube membranes, has a higher strength relative to the single-layered carbon nanotube membranes, ensuring that the carbon nanotube structure is not destroyed or altered. Preferably, the number of layers of the carbon nanotube film in the carbon nanotube structure is greater than 10 layers. The structure of the carbon nanotube film and the preparation method thereof can be found in the Taiwan Patent Application No. 200833862 filed on Feb. 12, 2007, the "Nano Carbon Tube Film Structure and Preparation Method". (Applicant: Tsinghua University, Hongfujin Precision Industry (Shenzhen) Co., Ltd.).

Referring to FIG. 5 , the thermal sound generating device 10 in this embodiment may further include a heat dissipating fan 19 , and the heat dissipating fan 19 is spaced apart from the plurality of fins 188 . It can be understood that the heat dissipation fan 19 can be fixed to the heat sink 188 by a snap and form a certain interval from the heat sink 188. The heat dissipation fan 19 accelerates the flow of the gas around the heat sink 188 by blowing the plurality of heat sinks 188, thereby improving the heat dissipation efficiency of the heat sink 188.

The first electrode 142 and the second electrode 144 are spaced apart from each other, and respectively correspond to one support body 16 and are electrically connected to the thermo-acoustic element 14 . The first electrode 142 and the second electrode 144 are formed of a conductive material, and the specific shape thereof is not limited. Specifically, the material of the first electrode 142 and the second electrode 144 may be selected from a metal, a conductive paste, a carbon nanotube, an indium tin oxide (ITO), or the like. The shapes of the first electrode 142 and the second electrode 144 may be selected from one of a layer shape, a rod shape, a block shape, or the like. In this embodiment, the first electrode 142 and the second electrode 144 are printed on the surface of the thermo-acoustic element 14 with a conductive paste, and the first electrode 142 and the second electrode 144 are respectively associated with the support body 16 correspond.

In this embodiment, the thermo-acoustic element 14 is a carbon nanotube film, and two ends of the carbon nanotube film are electrically connected to the first electrode 142 and the second electrode 144, respectively, and pass the An electrode 142 and a second electrode 144 are fixed to the surface of the support body 16. Since the carbon nanotube has a very large specific surface area, the nano carbon tube film itself has good adhesion under the action of van der Waals force, so the carbon nanotube film is used as a thermo-acoustic element. At 1400, the first electrode 142 and the second electrode 144 and the carbon nanotube film can be directly adhered and fixed, and form a good electrical contact.

In addition, the first electrode 142 and the second electrode 144 and the thermo-acoustic element 14 may further include a conductive bonding layer (not shown). The conductive bonding layer may be disposed on a surface of the thermo-acoustic element 14 that is in contact with the first electrode 142 and the second electrode 144. The conductive bonding layer can also make the first electrode 142 and the second electrode 144 and the heat-induced sound while making the first electrode 142 and the second electrode 144 electrically contact with the thermo-acoustic element 14. Element 14 is better fixed. In this embodiment, the conductive bonding layer material is silver paste.

The signal input device 12 inputs an audio signal or an alternating current signal to the thermoacoustic element 14 through the first electrode 142 and the second electrode 144, and the thermo-acoustic element 14 converts the audio signal or the alternating current signal For thermal energy, sound waves are emitted by heating to change the density of the surrounding medium. Specifically, the first electrode 142 and the second electrode 144 are electrically connected to the two ends of the signal input device 12 through an external wire 149 for transmitting the signal generated by the signal input device 12 to the heat generating sound. In element 14.

It can be understood that the first electrode 142, the second electrode 144 and the external lead 149 are optional structures according to the signal input device 12. When the input signal is a signal such as light or electromagnetic waves, the signal input device 12 can directly input a signal to the thermoacoustic element 14 without electrodes and wires.

In the embodiment of the present invention, the thermo-acoustic element 14 of the thermo-acoustic device 10 is a planar carbon nanotube structure, and the principle of sounding of the thermo-acoustic element 14 is "electric-thermal-acoustic" conversion. The carbon nanotube structure is composed of a uniformly distributed carbon nanotube tube, and the carbon nanotube structure is layered or linear and has a large specific surface area, so the carbon nanotube structure has a small unit. The area heat capacity and the large heat dissipation surface, after inputting the signal, the carbon nanotube structure can rapidly rise and fall, generate periodic temperature changes, and quickly exchange heat with the surrounding medium, so that the density of the surrounding medium periodically occurs. Change, and then make a sound. The heat sink 18 is adjacent to the first surface 184 of the thermo-acoustic element 14 to absorb heat dissipated by the thermo-acoustic element 14. The plurality of heat sinks 188 on the heat sink 18 rapidly transfer the heat emitted by the thermo-acoustic element 14 to the external environment, further reducing the temperature around the thermo-acoustic device 10. Thereby, the heat exchange efficiency of the thermo-acoustic element 14 and the surrounding medium can be improved, so that the thermo-acoustic element 14 obtains a better vocalizing effect.

Referring to FIG. 6 and FIG. 7, a second embodiment of the present invention provides a thermo-acoustic device 20. The thermo-acoustic device 20 of the second embodiment is similar in structure to the thermo-acoustic device 10 of the first embodiment, the main difference being that the second embodiment includes a plurality of first electrodes 242 and a plurality of second electrodes 244.

The thermo-acoustic device 20 includes a signal input device (not shown), a pyrogenic component 24, a plurality of first electrodes 242, a plurality of second electrodes 244, and a heat sink 28. The thermo-acoustic element 24 is spaced apart from the heat sink 28 by the plurality of first electrodes 242 and the plurality of second electrodes 244.

The heat sink 28 includes a base 285 and a plurality of fins 288. In this embodiment, the base 285 is a flat plate structure. The base 285 includes a first surface 284 and a second surface 286 opposite the first surface 284.

The area of the base 285 can be designed according to actual needs as long as it is not smaller than the area of the thermo-acoustic element 24. The susceptor 285 is made of an insulating material, which may be a rigid material such as diamond, glass, ceramic or quartz. In this embodiment, the base 285 is a ceramic plate. The pedestal 285 has a thickness of 1 mm to 5 mm. The arrangement is such that the heat dissipation requirements of the thermo-acoustic device 20 can be satisfied, and the overall size of the thermo-acoustic device 20 such as the thickness can be reduced to make the sound-emitting device 20 lighter. Moreover, the overall cost of the thermoacoustic device 20 can be reduced by controlling the thickness of the ceramic plate.

The plurality of fins 288 are disposed on the second surface 286 of the base 285. The heat sink 288 is a metal piece, and the material of the metal piece is any one of gold, silver, copper, iron, and aluminum. The material of the metal sheet may also be an alloy of at least two metals among metals such as gold, silver, copper, iron and aluminum. In this embodiment, the heat sink is a copper sheet having a thickness of 0.5 mm to 1 mm. The plurality of fins 288 may be fixed to the second surface 286 of the base 285 by bolts or welding. In this embodiment, the heat sink 288 is fixed to the second surface 286 of the base 285 by soldering. The heat sink 288 can transfer the heat generated by the thermo-acoustic element 24 during operation to the external environment.

The first electrode 242 and the second electrode 244 are alternately arranged in parallel at a first surface 284 of the base 285 . The pedestal 285 can serve as a support for the first electrode 242 and the second electrode 244. Since the susceptor 285 is made of an insulating material in the embodiment, the first electrode 242 and the second electrode Electrode 244 is well insulated. The first electrode 242 and the second electrode 244 may be fixed to the first surface 284 of the base 285 by bolts, or may be bonded to the first surface 284 of the base 285 by adhesive. The first electrode 242 and the second electrode 244 are elongated metal electrodes, which may be metal bars, metal wires, or the like. The material of the first electrode 242 and the second electrode 244 may be an alloy of one or more of gold, silver, copper, and iron. In this embodiment, the first electrode 242 and the second electrode 244 are metal copper wires. Specifically, a plurality of metal copper wires may be fixed to the first surface 284 of the susceptor 285 in parallel intervals.

The thermo-acoustic element 24 is parallel to the first surface 284 of the susceptor 285, and is disposed on the plurality of first electrodes 242 and 244, and is coupled to the first electrode 242 and the second electrode 244. Electrical connection. The thermo-acoustic element 24 is supported by the first electrode 242 and the second electrode 244 so as to be spaced apart from the susceptor 285. Since the thermo-acoustic element 24 is spaced apart from the susceptor 285, a space is formed between the thermo-acoustic element 24 and the pedestal 285, so that the vocalization effect of the thermo-acoustic element 24 can be facilitated. . In this embodiment, the thermo-acoustic element 24 includes at least one carbon nanotube film laid on the first electrode 242 and the second electrode 244, and the carbon nanotube film includes a plurality of substantially parallel The carbon nanotubes are arranged in the same direction. Preferably, the carbon nanotube film comprises a plurality of substantially parallel carbon nanotubes extending from the first electrode 242 toward the second electrode 244 in an axial direction thereof.

Further, in order to reduce the heat absorbed by the susceptor 285, the temperature of the susceptor 285 is prevented from being too high. A heat reflective layer 25 may be disposed on the first surface 284 of the base 285 of the heat sink 28 between the first electrode 242 and the second electrode 244. When the heat reflective layer 25 is a conductive material, a layer of insulating material may be added where the first electrode 242 and the second electrode 244 are in contact with the heat reflecting layer 25, such that the heat reflecting layer 25 and the first electrode 242 and second electrode 244 are electrically insulated. The material from which the heat reflective layer 25 is prepared includes a white metal, a metal compound, an alloy, or a composite material. Specifically, the material of the heat reflecting layer 25 is chromium, titanium, zinc, aluminum, gold, silver, aluminum zinc alloy or a coating containing aluminum oxide. The heat reflecting layer 25 has a heat reflectance of more than 30%, such as zinc, which has a heat radiation reflectance of 38%, and an aluminum-zinc alloy of 75%.

By providing a heat reflective layer 25 on the first surface 284 of the susceptor 285 opposite the thermo-acoustic elements 24, the thermal radiation element 230 can be reflected toward the thermal radiation emitted by the first surface 284, enabling The portion of the susceptor 285 that is blocked by the heat reflecting layer 25 absorbs less heat radiation, so that the temperature of the susceptor 285 when the thermally audible element 24 is operated is not too high.

The signal input device (not shown) inputs an audio signal or an alternating current signal to the thermo-acoustic component 24 through the first electrode 242 and the second electrode 244, and the thermo-acoustic component 24 encodes the audio signal Or the alternating current signal is converted into heat energy, and the sound wave is emitted by heating to change the density of the surrounding medium.

In this embodiment, the thermo-acoustic device 20 includes two first electrodes 242 and two second electrodes 244. The first electrodes 242 are disposed in parallel with the second electrodes 244. The first electrode 242 and the second electrode 244 provide support for the thermo-acoustic element 24 in addition to being electrically connected to the thermo-acoustic element 24. The first electrode 242 is electrically connected to one end of the signal input device, and the second electrode 244 is electrically connected to the other end of the signal input device to enable the thermo-acoustic component 24 to access the input signal. In this embodiment, the two adjacent first electrodes 242 are electrically connected to one end of the signal input device after being connected by wires, and the remaining two second electrodes 244 are connected by wires and input with the signal. The other end of the device is electrically connected. The above connection method enables parallel connection of the thermo-acoustic elements 24 between adjacent electrodes. The thermally audible elements 24 in parallel have a lower resistance to lower the operating voltage.

It can be understood that the thermal sound generating device 20 in this embodiment may further include a heat dissipating fan, and the heat dissipating fan is spaced apart from the plurality of heat dissipating fins 288. The heat dissipation fan accelerates the flow of the gas around the heat sink 288 by blowing the plurality of heat sinks 288, thereby improving the heat dissipation efficiency of the heat sink 288.

Referring to FIG. 8 and FIG. 9, a third embodiment of the present invention provides a thermo-acoustic device 30. The thermo-acoustic device 30 of the third embodiment is similar in structure to the thermo-acoustic device 20 of the second embodiment, the main difference being that the heat-dissipating device 38 of the thermo-acoustic device 30 of the third embodiment further includes a plurality of heat pipes 389.

The sounding device 30 includes a signal input device (not shown), a pyrogenic component 34, a plurality of first electrodes 342, a plurality of second electrodes 344, and a heat sink 38. The thermo-acoustic element 34 is spaced apart from the heat sink 38 by the plurality of first electrodes 342 and the plurality of second electrodes 344.

The heat sink 38 includes a base 385, a plurality of heat sinks 388, and a plurality of heat pipes 389. The plurality of heat pipes 389 are fixed to the base 385 , and the plurality of heat sinks 388 are inserted and fixed to the plurality of heat pipes 389 .

In the present embodiment, the base 385 is a flat plate structure, and the base 385 includes a first surface 384 and a second surface 386 opposite to the first surface 384. The area of the pedestal 385 can be designed according to actual needs as long as it is not smaller than the area of the thermo-acoustic element 34. The pedestal 385 is made of an insulating material, which may be a rigid material such as diamond, glass, ceramic or quartz. In this embodiment, the base 385 is a ceramic plate.

Please refer to FIG. 10, which is a cross-sectional view showing the structure of the heat pipe 389 in this embodiment. The heat pipe 389 includes a pipe body 3896 and a working medium 3895 housed in a cavity 3889 surrounded by the pipe body 3896. The working medium 3895 is a liquid having good fluidity, high heat of vaporization, and chemical stability, and has a large heat capacity (a large unit of temperature change or a large amount of heat released), and is liable to cause phase change, and may be water or the like. The tube body 3896 is composed of an outer wall layer 3892 and an inner wall layer 3894. The outer wall layer 3892 is made of a metal material having a high thermal conductivity such as aluminum or high carbon steel, and has a light weight and is not easily rusted. The inner wall layer 3894 is relatively thin and can be tightly bonded to the inner surface of the outer wall layer 3892 by electroplating, replacement or in various other ways, and the outer wall layer 3892 can be separated from the working medium 3895. The material used in the inner wall layer 3892 also has good thermal conductivity and has the property of being compatible with the working medium 3895, that is, the substance does not chemically react with the working medium 3895, and exhibits good consistency in chemical properties. The substance may be copper or nickel or the like. At the same time, the surface of the inner wall layer 3892 is formed with a plurality of capillary structures, such as burr-like protrusions (not shown), so that the working medium 3895 in the tube chamber 389 is easily attached to the tube after being diffused from the evaporation end to the condensation end. The inner surface 3892 of the body 3896 becomes a liquid reflux, thereby accelerating thermal cycling within the tube 3986.

Referring to FIG. 11 , the evaporation ends of the plurality of heat pipes 389 are vertically inserted and fixed to the second surface 386 of the base 385 to be fixed to the base 385 . The plurality of fins 388 are sleeved at equal intervals and fixed to the condensation end of the heat pipe 389 to form a heat pipe type heat sink.

The heat sink 388 is a metal sheet, and the material of the metal sheet is any one of gold, silver, copper, iron, aluminum or any alloy thereof. In this embodiment, the heat sink is a copper sheet having a thickness of 0.5 mm to 1 mm. The plurality of fins 388 may also be fixed to the condensation end of the heat pipe 389 by bolts or welding.

The first electrode 342 and the second electrode 344 are alternately arranged in parallel at a first surface 384 of the pedestal 385. The pedestal 385 can serve as a support for the first electrode 342 and the second electrode 344. Since the pedestal 385 is made of an insulating material, the first electrode 342 and the second Electrode 344 is well insulated. The first electrode 342 and the second electrode 344 may be fixed to the first surface 384 of the base 385 by bolts, or may be bonded to the first surface 384 of the base 385 by adhesive. The first electrode 342 and the second electrode 344 are elongated metal electrodes, which may be metal bars, metal wires, or the like. The material of the first electrode 342 and the second electrode 344 may be an alloy of one or more of gold, silver, copper, and iron. In this embodiment, the first electrode 342 and the second electrode 344 are metal copper wires. In particular, a plurality of metallic copper wires may be secured to the first surface 384 of the pedestal 385 in parallel spaced.

The thermo-acoustic element 34 is parallel to the first surface 384 of the pedestal 385, and is disposed on the plurality of first electrodes 342 and the second electrode 344, and is electrically connected to the first electrode 342 and the second electrode 344. connection. The thermo-acoustic element 34 is supported by the first electrode 342 and the second electrode 344 so as to be spaced apart from the pedestal 385. Since the thermo-acoustic element 34 is spaced apart from the susceptor 385, a certain space is formed between the thermo-acoustic element 34 and the pedestal 385, so that the vocalization effect of the utterance element 34 can be facilitated. In this embodiment, the thermo-acoustic element 34 includes at least one carbon nanotube film laid on the first electrode 342 and the second electrode 344, and the carbon nanotube film includes a plurality of substantially parallel The carbon nanotubes are arranged in the same direction. Preferably, the carbon nanotube film comprises a plurality of substantially parallel carbon nanotubes extending from the first electrode 342 toward the second electrode 344 along an axial direction thereof.

Further, in order to reduce the heat absorbed by the susceptor 385, a heat reflective layer 35 may be disposed on the first surface 384 of the pedestal 385 of the heat sink 38 between the first electrode 342 and the second electrode 344. . When the heat reflective layer 35 is a conductive material, a layer of insulating material may be added where the first electrode 342 and the second electrode 344 are in contact with the heat reflecting layer 35, so that the heat reflecting layer 35 and the first electrode 342 and the second electrode 344 are electrically insulated. Materials for preparing the heat reflective layer 35 include white metals, metal compounds, alloys or composite materials such as chromium, titanium, zinc, aluminum, gold, silver, aluminum zinc alloys or coatings comprising aluminum oxide. The heat reflecting layer 35 has a heat reflectance of more than 30%, such as zinc, which has a heat radiation reflectance of 38%, and an aluminum-zinc alloy of 75%.

By providing a heat reflective layer 35 on the first surface 384 of the pedestal 385 opposite the thermo-acoustic elements 34, the thermal radiation emitted by the thermo-acoustic element 34 to the first surface 384 can be reflected, enabling The portion of the susceptor 385 that is blocked by the heat reflective layer 35 absorbs less heat radiation, so that the temperature of the susceptor 385 when the thermally audible element 34 is operated is not too high.

The signal input device (not shown) inputs an audio signal or an alternating current signal to the thermoacoustic element 34 through the plurality of first electrodes 342 and the plurality of second electrodes 344, and the thermo-acoustic element 34 The audio signal or the alternating current signal is converted into thermal energy, and the sound wave is emitted by heating the surrounding medium to change the density of the surrounding medium.

In this embodiment, the thermo-acoustic device 30 includes two first electrodes 342 and two second electrodes 344. The first electrodes 342 are disposed in parallel with the second electrodes 344. The first electrode 342 and the second electrode 344 provide support for the thermo-acoustic element 34 in addition to being electrically connected to the thermo-acoustic element 34. The first electrode 342 is electrically connected to one end of the signal input device, and the second electrode 344 is electrically connected to the other end of the signal input device to enable the sound emitting element 34 to access the input signal. In this embodiment, the two adjacent first electrodes 342 are electrically connected to one end of the signal input device, and the remaining two second electrodes 344 are connected by wires and input with the signal. The other end of the device is electrically connected. The above connection can achieve parallel connection of the thermally audible elements 34 between adjacent electrodes. The parallel-connected thermo-acoustic elements 34 have a small electrical resistance that reduces the operating voltage.

It can be understood that the thermal sound generating device 30 in this embodiment may further include a heat dissipating fan, and the heat dissipating fan is spaced apart from the plurality of heat dissipating fins 388. The heat dissipation fan accelerates the flow of the gas around the heat sink 388 by blowing the plurality of heat sinks 388, thereby improving the heat dissipation efficiency of the heat sink 388.

When the thermo-acoustic device 30 in this embodiment is in operation, the temperature of the thermo-acoustic element 34 will rise, thereby causing a periodic change in the ambient temperature, which is the same as the input of the thermo-acoustic element 34. The signals are consistent and the sound is achieved. The susceptor 385 supporting the thermo-acoustic element 34 will also absorb the heat of the thermo-acoustic element 34 to increase the temperature. At this time, the evaporation end of the heat pipe 389 fixed on the base 385 is heated accordingly, and the liquid working medium 3895 located in the evaporation end cavity 3988 of the heat pipe 389 adsorbs a large amount of heat of vaporization to make the temperature of the base 385. Lowering, the working medium 3895 absorbs heat into a gaseous state, and then the working medium 3895 diffuses into the condensation zone in a gaseous state and adsorbs on the surface of many capillary structures of the inner wall layer 3894 of the pipe body 3896 to be condensed into a liquid state. In the above process, the working medium 3895 discharges a large amount of heat of liquefaction, so that the heat generated by the heat generating component can be conducted from the susceptor 385 to the heat sink 388 at a relatively high speed, and the heat is radiated to the outside through the heat sink 388 to achieve efficient and rapid heat dissipation.

The thermo-acoustic device provided by the present invention is provided with a heat dissipating device on one side of the thermo-acoustic element. The heat dissipating device absorbs the heat emitted by the thermo-acoustic element and dissipates the absorbed heat to the outside, thereby reducing the ambient temperature during operation of the thermo-acoustic device, and improving the use of the thermo-acoustic device Life and work efficiency.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10,20,30‧‧‧Thermal sounding device

12‧‧‧Signal input device

14,24,34‧‧‧Thermal vocal components

16‧‧‧Support

18,28,38‧‧‧heating device

19‧‧‧ cooling fan

25,35‧‧‧heat reflective layer

142,242,342‧‧‧first electrode

144,244,344‧‧‧second electrode

143‧‧‧Nano carbon nanotube fragments

145‧‧・Nano carbon tube

149‧‧‧Wire

184,284,384‧‧‧ first surface

185,285,385‧‧‧Base

186,286,386‧‧‧second surface

188,288‧‧‧ Heat sink

389‧‧‧heat pipe

3892‧‧‧ outer wall

3894‧‧‧ inner wall

3895‧‧‧Working media

3896‧‧‧Body

3898‧‧‧ Cavity

1 is a perspective view showing the structure of a thermoacoustic device according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view of the thermoacoustic device of Figure 1 taken along line II-II.

3 is a scanning electron micrograph of a carbon nanotube film taken by the thermoacoustic element of the thermoacoustic device of FIG. 1.

4 is a schematic enlarged view of a portion of a carbon nanotube segment in the carbon nanotube film of FIG.

FIG. 5 is a schematic structural view of a heat-induced sounding device according to a first embodiment of the present invention when a heat-dissipating fan is used.

Fig. 6 is a plan view showing a three-dimensional structure of a thermoacoustic device according to a second embodiment of the present invention.

Figure 7 is a cross-sectional view of the thermoacoustic device of Figure 6 taken along line VI-VI.

Figure 8 is a perspective view showing the structure of a thermoacoustic device according to a third embodiment of the present invention.

Figure 9 is a cross-sectional view of the thermoacoustic device of Figure 8 taken along line VIII-VIII.

Figure 10 is a schematic enlarged plan view showing a heat pipe in a heat sink of a thermoacoustic device according to a third embodiment of the present invention.

Figure 11 is a bottom plan view showing the three-dimensional structure of a thermoacoustic device according to a third embodiment of the present invention.

10‧‧‧Thermal sounding device

12‧‧‧Signal input device

14‧‧‧Hot-induced sounding components

16‧‧‧Support

18‧‧‧ Heat sink

142‧‧‧First electrode

144‧‧‧second electrode

149‧‧‧Wire

184‧‧‧ first surface

185‧‧‧Base

186‧‧‧ second surface

188‧‧‧ Heat sink

Claims (24)

A thermo-acoustic device comprising:
a pyrogenic component;
At least one first electrode and at least one second electrode, the first electrode and the second electrode are disposed in parallel and electrically connected to the thermo-acoustic element;
The improvement is that the sounding device further comprises a heat dissipating device opposite to and spaced apart from the thermo-acoustic element. The heat-induced sounding device of claim 1, wherein the heat sink comprises a base, the base comprising a first surface and a second surface opposite the first surface, The thermally audible elements are disposed parallel to and spaced apart from the first surface. The thermal sound generating device of claim 2, wherein the heat dissipating device comprises a plurality of fins, and the plurality of fins are disposed on the second surface of the base. The heat-induced sounding device of claim 3, wherein the heat sink comprises a plurality of heat pipes, and the plurality of heat pipes are disposed on the base and connected to the plurality of heat sinks. The thermoacoustic device according to claim 2, wherein the at least one first electrode and the at least one second electrode are disposed in parallel at a first surface of the pedestal. The thermoacoustic device according to claim 5, wherein the thermoacoustic element is laid on the first electrode and the second electrode, and the first electrode and the second electrode are connected to the base The first surfaces are spaced apart in parallel. The thermoacoustic device according to claim 5, wherein the first surface of the susceptor between the first electrode and the second electrode is provided with a layer of a reflective material. The thermoacoustic device according to claim 7, wherein the material of the reflective material layer comprises a white metal, a metal compound, an alloy or a composite material. The thermoacoustic device according to claim 8, wherein the reflective material layer is electrically insulated from the first electrode and the second electrode. The thermoacoustic device according to claim 1, wherein the thermoacoustic element has a heat capacity per unit area of less than 2.0 × 10 ^-4 Joules per square centimeter Kelvin. The thermoacoustic device according to claim 1, wherein the thermoacoustic element is a carbon nanotube film. The thermoacoustic device according to claim 11, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation in the same direction, and the carbon nanotubes are passed between Devalli is connected to each other. The thermoacoustic device according to claim 12, wherein the carbon nanotubes in the carbon nanotube film are arranged in a direction from the first electrode to the second electrode. The thermoacoustic device according to claim 1, wherein the thermo-acoustic device further comprises a heat-dissipating fan, and the heat-dissipating fan is spaced apart from the heat-dissipating device. A thermo-acoustic device comprising:
a pyrogenic component;
a plurality of first electrodes and a plurality of second electrodes are disposed in parallel and alternately spaced apart, and the thermo-acoustic elements are laid and electrically connected to the plurality of first electrodes and the plurality of second electrodes;
The improvement is that the thermo-acoustic device further includes a heat dissipating device, the thermo-acoustic device is spaced apart from the heat dissipating device, and the heat dissipating device comprises a base, a plurality of heat pipes and a plurality of heat sinks, The heat pipe is fixed to the base, and the plurality of heat sinks are fixed in parallel to the plurality of heat pipes. The thermoacoustic device of claim 15, wherein the base comprises a first surface and a second surface opposite the first surface. The thermal sound generating device of claim 16, wherein each of the heat pipes has an evaporation end and a condensation end, and an evaporation end of the plurality of heat pipes is fixed to the second surface of the base. The plurality of fins are fixed in parallel at equal intervals to the condensation end of the plurality of heat pipes. The thermoacoustic device according to claim 16, wherein the plurality of first electrodes and the plurality of second electrodes are disposed in parallel on the first surface of the susceptor, and the thermoacoustic elements are parallel And the first surface is disposed on the first electrode and the second electrode to be spaced apart from the heat dissipation device. The thermoacoustic device according to claim 18, wherein the first surface of the susceptor between the first electrode and the second electrode is provided with a reflective material layer. The thermoacoustic device according to claim 19, wherein the reflective material layer is electrically insulated from the first electrode and the second electrode. The thermo-acoustic device of claim 15, wherein the thermo-acoustic device further comprises a heat-dissipating fan, the heat-dissipating fan being spaced apart from the heat sink. The thermoacoustic device according to claim 15, wherein the material of the susceptor is an insulating material, and the material of the susceptor comprises diamond, glass, ceramic or quartz. The heat-induced sounding device of claim 15, wherein the heat pipe comprises a pipe body and a working medium contained in the pipe body, the pipe body being composed of an outer wall layer and an inner wall layer, The inner wall layer is formed with a capillary structure. A thermo-acoustic device comprising:
a pyrogenic component;
a plurality of first electrodes and a plurality of second electrodes are disposed in parallel and alternately spaced apart, and the thermo-acoustic elements are laid and electrically connected to the plurality of first electrodes and the plurality of second electrodes;
a pedestal, the pedestal includes a first surface and a second surface opposite to the first surface, the plurality of first electrodes and the plurality of second electrodes are disposed on the first surface of the pedestal The pedestal provides support for the plurality of first electrodes and the plurality of second electrodes;
The improvement is that the thermo-acoustic device further includes: a plurality of heat pipes and a plurality of heat sinks, wherein the heat pipes are fixed on the second surface of the base, and the plurality of heat sinks are fixed in parallel at equal intervals Multiple heat pipes.