JP2007209845A - Jet flow generator and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet flow generator capable of suppressing vibration as far as possible while being made thin, and an electronic apparatus. <P>SOLUTION: Two vibration plates 3a, 3b are supported on the casing 1 of the jet flow generator 10 via elastic support members 6a, 6b so that they can be vibrated. One driving part 15 is provided between the respective vibration plates, to drive the vibration plates in a vibrating direction R in reverse phases and discharge air in a chamber 12 as pulse flow to the outside of the casing 1 via openings 2. The driving part 15 is constituted of coil bobbin 4a and coil 5a, and coil bobbin 4b and a coil 5b, a first electromagnetic actuator 15a and a second electromagnetic actuator 15b which share a magnetic circuit. A coil 5a provided to the vibration plate 3a and a coil 5b provided to the vibration plate 3b can be disposed in a nest state by making diameters of the coil 5a and the coil 5b different. Thus, the thickness of the jet flow generator 10 can be made thin in a Z-direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a jet generating device that generates a synthetic jet of gas, an electronic device equipped with the jet generating device, and a jet generating method.

  Conventionally, an increase in the amount of heat generated from a heating element such as an IC (Integrated Circuit) associated with high performance of a PC (Personal Computer) has been a problem, and various heat radiation technologies have been proposed or commercialized. Yes.

  As a heat dissipation method, a composite jet is generated by discharging air in a pulsating flow, and this combined jet is supplied to a heat dissipation fin (heat sink), etc., and the temperature boundary layer formed on the surface of the heat dissipation fin is efficient. There is a method of well destroying and dissipating heat (see, for example, Patent Document 1). Such a jet generating device has a housing having an opening and a diaphragm that causes a pressure change in the air in the housing. When the diaphragm vibrates, a pressure change occurs in the casing, and air is discharged as a pulsating flow through the opening, thereby generating a synthetic jet.

  The synthetic jet is generated according to the following principle. As air flows when air is discharged from the opening of the housing, the air pressure around the opening outside the housing is reduced, so that the surrounding air is caught in the air discharged from the opening. A synthetic jet is generated.

  Moreover, since the jet flow generator described in Patent Document 1 alternately discharges air from the two chambers, that is, discharges air in opposite phases, the sound generated from each chamber and opening (discharge port) weakens each other. . This reduces noise.

  By the way, when the jet generating device as described in Patent Document 1 is mounted on a mobile device such as a laptop PC (Personal Computer), for example, further thinning of the jet generating device is desired. However, in the jet flow generating apparatus as described above, it is necessary to vibrate the diaphragm with a predetermined amplitude in order to discharge gas, and this amplitude becomes a bottleneck for thinning the jet flow generating apparatus.

  As a technique for thinning the entire device while obtaining a predetermined amplitude in a mobile device, Patent Document 2 below discloses a diaphragm that propagates vibrations in the air using a housing as a base frame, and a first attached to the diaphragm. A voice drive coil is arranged with a magnet gap, a magnet holder for assembling the magnet, and a spring body for supporting the magnet holder, and a driving circuit for sound generation is assembled and stretched on the open end of the housing There is described an electromagnetic induction type actuator device in which a drive circuit for vibration is assembled from a stationary plate and a second voice coil that is attached to the stationary plate and arranged with a magnet and a magnetic gap therebetween. In the actuator device, a concave magnet is provided on the opposite side of the magnet holder from the diaphragm, an opening is provided in the center of the concave, and the magnet has an inner diameter that matches the aperture diameter. The first voice coil is disposed relative to the inner diameter of the ring-shaped magnet, and the second voice coil is disposed relative to the outer shape of the ring-shaped magnet, so that the two voice coils and the magnet have a so-called nested structure. The overall equipment has been made thinner.

In addition, when the jet generating device as described in Patent Document 1 is mounted on an electronic device, vibration of the jet generating device itself due to vibration of the diaphragm is suppressed as much as possible while maintaining the effect of generating the synthetic jet. There is a need. In Patent Document 3 below, a voice coil is provided between two diaphragms in a casing, magnets are provided on both diaphragms, and the voice coil is driven to drive the four spaces. Thus, there is described a heat dissipation device that discharges air through openings provided in the housing corresponding to the space.
Japanese Patent Laying-Open No. 2005-256834 (paragraph [0079], FIG. 1) JP 2001-259525 A (paragraph [0039], FIG. 2) Japanese Patent Laid-Open No. 03-116961 (FIG. 9)

  However, in the actuator device described in Patent Document 2, since the stationary plate is fixed to the housing, the entire device is vibrated by the drive circuit for vibration. Therefore, when trying to apply the actuator device described in Patent Document 2 to the vibration actuator of the jet flow generating device described in Patent Document 1, there arises a problem that the jet generating device and thus the electronic equipment vibrates. Therefore, the jet generating device described in Patent Document 1 and the actuator device described in Patent Document 2 cannot be simply combined.

  Further, in the heat dissipation device described in Patent Document 3, since the magnet is provided on the diaphragm, the diaphragm is less likely to vibrate due to the weight of the magnet, and power consumption is reduced if such a diaphragm is driven. There is a problem of growing.

  In view of the circumstances as described above, an object of the present invention is to provide a jet generating device and an electronic apparatus that can suppress vibration as much as possible while realizing a reduction in thickness.

  In order to solve the above-described problem, a jet flow generating device according to a main aspect of the present invention includes a first diaphragm, a second diaphragm facing the first diaphragm, and the first and second diaphragms. It has one first chamber formed between the diaphragms and a first opening communicating with the first chamber. Gas is contained inside and the first and second diaphragms can be vibrated. And a first diaphragm and a second diaphragm disposed in the first chamber and for discharging the gas as a pulsating flow outside the casing through the first opening. And a driving unit for driving the motor.

  As a result, the two diaphragms can be driven by a single drive unit, and air can be efficiently discharged while reducing the thickness of the jet flow generator.

  As a drive system of the drive unit, for example, an electromagnetic action, a piezoelectric action, or an electrostatic action can be used. Examples of the gas include air, but are not limited thereto, and may be nitrogen, helium gas, argon gas, or other gases. Each of the diaphragms is provided so as to vibrate in each opening of the housing via, for example, a bellows-like elastic support member.

  In the jet flow generating device, the driving unit drives the first diaphragm to one side of the vibration direction and drives the second diaphragm to the opposite side to the one side. Good.

  In this configuration, each diaphragm is driven so that the volume of the first chamber is reduced, gas is discharged from the first chamber through the first opening, and the volume of the first chamber is The operation of driving each diaphragm so as to increase and sucking gas into the first chamber through the first opening is alternately repeated. When each diaphragm is driven in reverse phase, the vibration of each diaphragm is canceled and the vibration of the entire jet flow generating device can be suppressed as much as possible. In addition, since the sound due to the vibration of each diaphragm can be canceled, the noise of the entire jet flow generating device can be suppressed as much as possible.

  In the jet flow generating device, the driving unit is provided on the first diaphragm, and a first coil having a first outer diameter, and the second diaphragm are substantially concentric with the first diaphragm. And a magnetic circuit having a second coil having a second inner diameter larger than the first outer diameter, a magnet, and a magnetic gap in which the first and second coils are disposed. You may have.

  Thereby, the inner diameter of the second coil is larger than the outer diameter of the first coil, and a magnetic gap in which both coils are arranged is provided in the magnetic circuit. It can be arranged in a so-called nested manner, and the occupied space in the vibration direction in the casing of the first and second coils can be reduced, and the entire jet flow generating device can be further reduced in thickness.

  In the jet flow generating device, the magnet may be a columnar magnet that is disposed inside the first and second coils and has a diameter smaller than the inner diameter of the first coil.

  Thus, the overall structure of the jet flow generator can be reduced by adopting a so-called inner magnet type structure in which the magnet is provided inside the first and second coils while the first coil and the second coil are nested. Can be realized.

  In the above-described jet flow generating device, the magnet may be a ring-shaped magnet that is disposed outside the first and second coils and has an inner diameter larger than the outer diameter of the second coil.

  Thus, the overall thickness of the jet flow generating device is reduced by adopting a so-called outer magnet type structure in which the magnet is provided outside the first and second coils while the first coil and the second coil are nested. Can be realized.

  In the jet flow generating device, the magnet is disposed outside the first coil and inside the second coil, and has an inner diameter larger than the outer diameter of the first coil, and the second coil. It may be a ring-shaped magnet having an outer diameter smaller than the inner diameter.

  As a result, the entire jet flow generating device can be obtained by adopting a so-called middle-magnet structure in which the magnet is provided between the first coil and the second coil while the first coil and the second coil are nested. Can be made thinner.

  In the jet flow generating device, the housing is formed in a direction opposite to the first chamber in the vibration direction of the first diaphragm, with the first diaphragm interposed therebetween. Two chambers and one third chamber formed in a direction opposite to the first chamber in the vibration direction of the second diaphragm and sandwiching the second diaphragm, A second opening that communicates with the second chamber and a third opening that communicates with the third chamber may be provided.

  Thereby, by providing three chambers and three openings, the amount of discharge can be increased and gas can be discharged efficiently.

  In the jet flow generating device, the first opening and the third opening are each provided by a first number, each has a first area, and each second opening is provided by the first number. Each of which may have a second area approximately twice the first area.

  Thereby, when the number of each opening is the same, the area of the second opening is set to be twice the area of the first opening and the third opening, so that the gas discharged or sucked from each opening can be reduced. The flow velocity becomes uniform, and the noise (wind noise) generated by the discharge or suction of gas from the first opening and the third opening cancels out the noise generated by the suction or discharge of gas from the second opening, thereby generating a jet flow. Noise of the entire device can be suppressed as much as possible.

  In the jet flow generating device, each of the first opening and the third opening has a first opening area and is provided in a first number, and the second opening is the first opening. There may be provided a second number that has an area and is twice the first number.

  Thereby, when the area of each opening is the same, the flow rate of the gas discharged from each opening can be increased by setting the number of the second openings to twice the number of the first openings and the third openings. It becomes uniform, the noise (wind noise) generated by the discharge or suction of the gas from each opening is canceled out, and the noise of the entire jet generating device can be suppressed as much as possible.

  A jet flow generating apparatus according to another aspect of the present invention includes a first diaphragm, a second diaphragm facing the first diaphragm, the first diaphragm, and the second diaphragm. And a first chamber formed between the first diaphragm and the vibration direction of the first diaphragm. The first chamber is formed on the opposite side of the first diaphragm. One second chamber, and one third chamber formed on the opposite side of the first chamber in the vibration direction of the second diaphragm and sandwiching the second diaphragm A first opening that communicates with the first chamber, a second opening that communicates with the second chamber, and a third opening that communicates with the third chamber, The second diaphragm is supported so as to be able to vibrate, and a housing containing gas therein is disposed in the first chamber, In order to discharge a body as a pulsating flow from the first chamber, the second chamber, and the third chamber to the outside of the housing through the first opening, the second opening, and the third opening, respectively. A first vibration plate and a drive unit for driving the second vibration plate.

  As a result, the two diaphragms are driven by a single drive unit, and the jet flow generator is made thin, while providing three openings and chambers, thereby increasing the discharge amount and efficiently discharging air. can do.

  In the jet flow generating device, the driving unit drives the first diaphragm to one side of the vibration direction and drives the second diaphragm to the opposite side to the one side. Good.

  In this configuration, when the first diaphragm and the second diaphragm are driven by the drive unit, gas is passed from the first chamber and the third chamber through the first opening and the third opening. Is discharged from the second chamber through the second opening, and the outside air is discharged from the first chamber and the third chamber through the first opening and the third opening. When gas is inhaled, the operation of discharging gas from the second chamber through the second opening is repeated alternately. With this configuration, the two diaphragms are driven in reverse phase, so that the vibrations of the diaphragms are canceled out and gas can be discharged efficiently through the three openings while suppressing the vibration of the entire jet flow generator as much as possible. It becomes.

  An electronic apparatus according to the present invention includes a heating element, a first diaphragm, a second diaphragm facing the first diaphragm, and one chamber formed between the first and second diaphragms. And an opening that communicates with the chamber, and a gas is contained therein, and a housing that supports the first and second diaphragms so as to vibrate is disposed within the chamber, and the gas is contained in the chamber. A jet generating device having a drive unit for driving the first and second diaphragms in order to discharge as a pulsating flow toward the heating element through the opening;

  As a result, the two diaphragms of the jet flow generating device can be driven by a single drive unit, and the efficiency of the heating element can be reduced while reducing the thickness of the entire electronic device by reducing the thickness of the jet flow generating device. It is possible to cool the heating element efficiently by discharging air well.

  Electronic devices include computers (in the case of personal computers, laptop computers or desktop computers), PDAs (Personal Digital Assistance), electronic dictionaries, cameras, display devices, audio / visual devices, A projector, a mobile phone, a game device, a car navigation device, a robot device, other electric appliances, and the like can be given. Examples of the heating element include an electronic component such as an IC and a resistor, a heat radiating fin (heat sink), and the like.

  In addition, the second housing means that the heating element and the jet generating device can be “held”. The heating element and the jet generating device do not necessarily need to be “accommodated”. This means that it may be exposed to the outside of the housing.

  An electronic device according to another aspect of the present invention includes a heating element, a first diaphragm, a second diaphragm facing the first diaphragm, the first diaphragm, and the second diaphragm. One first chamber formed between the diaphragm and the vibration direction of the first diaphragm on the opposite side of the first chamber across the first diaphragm One second chamber formed and one third chamber formed in the vibration direction of the second diaphragm and on the opposite side of the first chamber across the second diaphragm. A first opening that communicates with the first chamber, a second opening that communicates with the second chamber, and a third opening that communicates with the third chamber, The first and second diaphragms are supported so as to be able to vibrate, and a casing containing gas therein is disposed in the first chamber. In order to discharge the gas as a pulsating flow from the first chamber, the second chamber, and the third chamber to the heating element through the first opening, the second opening, and the third opening, respectively. And a jet generating device having a drive unit for driving the first diaphragm and the second diaphragm.

  As a result, the two diaphragms of the jet flow generating device can be driven by a single drive unit, and the overall thickness of the electronic device can be reduced by reducing the thickness of the jet flow generating device. Through the three openings provided, more gas can be efficiently discharged to the heating element to cool the heating element efficiently.

  As described above, according to the present invention, vibration can be suppressed as much as possible while realizing a reduction in thickness.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a perspective view showing a jet flow generating apparatus according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA ′ of the jet flow generating device shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB ′ of the jet flow generating device shown in FIG.

  As shown in these drawings, the jet flow generating device 10 includes a casing 1 containing air therein and two diaphragms 3 a and 3 b provided in the casing 1.

  A chamber 12 is formed between the diaphragm 3 a and the diaphragm 3 b inside the housing 1, and an opening 2 communicating the chamber 12 and the outside of the housing 1 is formed on a side surface 1 c of the housing 1. Are provided in parallel in the X-axis direction in each figure. Further, the upper surface 1a and the lower surface 1b of the housing 1 are opened in a rectangular shape, and the diaphragms 3a and 3b are provided so as to face each other through the elastic support members 6a and 6b so as to close the opening. ing. The elastic support members 6a and 6b are mounted on the upper surface 1a of the housing 1, and elastically support the periphery of the diaphragms 3a and 3b. Thus, the diaphragms 3a and 3b are supported by the housing 1 so as to be able to vibrate.

  As shown in FIGS. 2 and 3, a drive unit 15 is provided in the chamber 12. The drive unit 15 includes, for example, a columnar magnet 7, a first disc-shaped yoke 8 a provided on the upper surface of the magnet 7, and a diameter of the first disc-shaped yoke 8 a provided on the lower surface of the magnet 7. A second disk-shaped yoke 8b having a larger diameter, a ring-shaped upper surface provided substantially on the same plane as the first disk-shaped yoke 8a, and substantially the same plane as the second disk-shaped yoke 8b. Each yoke of the cylindrical yoke 8c having the lower surface provided on the upper side is provided. The second disk-shaped yoke 8 b and the cylindrical yoke 8 c are connected by a cylindrical connecting member 9. A magnetic field is generated by the magnet 7 and each yoke to form a magnetic circuit.

  The magnetic circuit has a magnetic gap 11 between the magnet 7 and each yoke. In the magnetic gap 11, a coil bobbin 4a around which a coil 5a is wound and a coil bobbin 4b around which a coil 5b is wound. And come and go. That is, the coil bobbin 4a is in the magnetic gap 11 between the first disk-shaped yoke 8a and the cylindrical yoke 8c, and the coil bobbin 4b is in the magnetic gap 11 between the second disk-shaped yoke 8b and the cylindrical yoke 8c. Are going to enter each. The coil bobbin 4a is fixed in the vibration direction R on the lower surface of the diaphragm 3a, and the coil bobbin 4b is fixed in the vibration direction R on the upper surface of the diaphragm 3b. That is, the drive unit 15 includes a first electromagnetic actuator 15a and a second electromagnetic actuator 15b that have a coil bobbin 4a and a coil 5a, a coil bobbin 4b and a coil 5b, respectively, and share a magnetic circuit. In the present embodiment, the columnar magnet 7 is arranged inside the coils 5a and 5b, so that a so-called inner magnet type magnetic circuit configuration is obtained.

  The coil 5a and the coil 5b are connected to the input terminals 16a and 16b, respectively, via the feed lines, and further connected to the drive signal generator 14. By supplying an electrical signal from the drive signal generator 14 to the drive unit 15 configured in this way, the diaphragms 3a and 3b can be vibrated in the direction of the arrow R.

  The coil bobbin 4a has a diameter smaller than that of the coil bobbin 4b. Since the magnetic circuit has a magnetic gap corresponding to each diameter of the coil bobbin 4a and the coil bobbin 4b, the coil bobbin 4a and the coil bobbin 4b. Is so-called nested with respect to the magnetic gap 11.

  As described above, in the driving unit 15, the casing 1 can be thinned in the Z direction by arranging the coil bobbins 4a and 4b having different diameters in a nested manner while sharing the magnetic circuit. It has become.

  The drive unit 15 is supported by the housing 1 by fixing the side surface of the cylindrical yoke 8 c to the inner wall of the housing 1 via the drive unit support member 13. For example, three drive unit support members 13 are provided as shown in FIG. 3, but the number is not limited to this.

  The diaphragms 3a and 3b are made of, for example, resin, paper, or metal. In particular, the diaphragms 3a and 3b are made of paper, so that the weight is extremely reduced. Paper is not as easy to make in an arbitrary shape as resin, but it is advantageous in reducing the weight. When the diaphragms 3a and 3b are made of resin, they can be easily formed into an arbitrary shape by molding. On the other hand, when the diaphragms 3a and 3b are metal, they are made of, for example, copper, aluminum, or stainless steel. Alternatively, magnesium may be used. Magnesium is advantageous because it is lightweight and can be injection molded. The diaphragms 3a and 3b do not have to be flat and may be, for example, a three-dimensional vibrator. As the planar shape of the diaphragms 3a and 3b (the shape of the surface substantially perpendicular to the vibration direction R), a shape such as a circle, an ellipse, or a combination thereof can be considered in addition to a rectangle.

  The housing 1 is made of, for example, resin, rubber, or metal. Resin and rubber are easy to produce by molding and are suitable for mass production. Further, when the housing 1 is made of resin or rubber, it is possible to suppress sound generated by driving the electromagnetic actuators 15a and 15b or airflow sound generated by vibration of the diaphragms 3a and 3b. That is, when the housing 1 is made of resin or rubber, the attenuation rate of those sounds also increases, and noise can be suppressed. Furthermore, it can respond to weight reduction and becomes low-cost. When the housing 1 is made of a material having high thermal conductivity, for example, metal, heat generated from the driving unit 15 can be released to the housing 1 and radiated to the outside of the housing 1. Examples of the metal include aluminum and copper. When considering thermal conductivity, carbon is not limited to metal. As the metal, magnesium that can be injection-molded can be used. When the leakage magnetic field from the magnetic circuit of the drive unit 15 affects other devices of the device, it is necessary to devise a method for eliminating the leakage magnetic field. One of them is to make the housing 1 from a magnetic material such as iron. Thereby, the leakage magnetic field is reduced to a considerable level. Further, it may be a ceramic case for use at high temperatures or for special applications.

  The elastic support members 6a and 6b are made of rubber or resin, for example. The shape of the elastic support members 6 a and 6 b depends on the shape (outer shape) of the diaphragm 33. As shown in FIG. 2, the elastic support members 6a and 6b have a cross-sectional shape having one peak and one valley. Hereinafter, this is referred to as a two-roll type elastic support member. In the case of an elastic support member consisting of only one valley portion or only one mountain portion, the height in the vertical direction in FIG. 2 increases and the thickness increases. When there are a plurality of crests and troughs, complicated movements other than the vibration direction R may occur when the diaphragms 3a and 3b vibrate, which may reduce efficiency. Moreover, there is a risk that noise will increase. Therefore, it is desirable to use a two-roll type elastic support member. However, the 2-roll type does not necessarily have to be used.

  Furthermore, the drive unit 15 can drive the diaphragms 3a and 3b in opposite phases. That is, as shown in FIG. 2, when the diaphragm 3a is driven in the direction of arrow R1 (outward direction of the casing 1), the diaphragm 3b is driven in the direction of arrow R2 (outward direction of the casing 1). When 3a is driven in the direction of arrow R2 (inner direction of the casing 1), the diaphragm 3b is driven in the direction of arrow R1 (inner direction of the casing 1).

  FIG. 4 is a diagram illustrating a connection example of each input terminal of the driving unit 15 for the reverse phase driving. FIG. 4A shows the case of parallel connection, and FIG. 4B shows the case of series connection.

  As shown in FIG. 5A, in the case of parallel connection, the first positive electrode and the second positive electrode are connected to each other at the input terminal 16a of the first electromagnetic actuator 15a and the input terminal 16b of the second electromagnetic actuator 15b. Are electrically connected, and the first negative electrode and the second negative electrode are electrically connected. The first positive electrode is connected to the positive terminal of the input terminal of the drive signal generator 14, and the first negative electrode is connected to the negative terminal of the input terminal of the drive signal generator 14.

  As shown in FIG. 5B, in the case of series connection, the first negative electrode and the second positive electrode are electrically connected. The first positive electrode is connected to the positive electrode of the input terminal of the drive signal generator 14, and the second negative electrode is connected to the negative electrode of the input terminal of the drive signal generator 14.

  Next, the operation of the jet flow generating device 10 configured as described above will be described.

  When, for example, a sinusoidal AC voltage is applied to the drive unit 15 from the drive signal generation unit 14, the diaphragms 3a and 3b perform sinusoidal vibration so as to be driven in reverse phase as described above. Thereby, the volume in the chamber 12 increases or decreases. That is, when the diaphragms 3a and 3b are driven to the outside of the casing 1, the volume of the chamber 12 is increased, and when the diaphragms 3a and 3b are driven to the inside of the casing 1, the volume of the chamber 12 is decreased. As the volume of the chamber 12 changes, the pressure in the chamber 12 increases or decreases, and accordingly, the air in the chamber 12 is discharged as a pulsating flow through the plurality of openings 2. When air is discharged from the opening 2, the air pressure around the housing 1 and the opening 2 decreases, so that the surrounding air is caught in the air discharged from the opening 2 and a synthetic jet is generated. This synthetic jet can be cooled by being blown to a heating element (not shown) or a high-heat part. Examples of the heating element include an electronic component such as an IC, a coil, a resistor, or a heat radiating fin (heat sink).

  At this time, since the diaphragms 3a and 3b are driven in opposite phases as described above, the vibrations (variations of the center of gravity) of the diaphragms can be canceled out, and the vibration of the entire jet flow generator 10 can be suppressed as much as possible.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, in this embodiment, the same code | symbol is attached | subjected about the location which becomes the structure and function similar to the jet flow generator 10 in the said 1st Embodiment, and description is abbreviate | omitted or simplified.

  FIG. 5 is a view showing the jet flow generating device 20 in the present embodiment. The drive unit 15 in the first embodiment forms a so-called inner magnet type magnetic circuit in which the columnar magnet 7 is arranged inside the coils 5a and 5b. However, the drive unit 15 in the present embodiment A magnet 17 forms a so-called outer magnet type magnetic circuit arranged outside the coils 5a and 5b.

  That is, the drive unit 15 in the present embodiment has a ring-shaped magnet 17, and the magnetic circuit is sandwiched between the lower surface of the first disk-shaped yoke 8a and the upper surface of the second disk-shaped yoke 8b. The provided columnar yoke 8f and the first ring-shaped yoke 8d provided on the upper surface and the lower surface of the magnet 17 on substantially the same plane as the first disk-shaped yoke 8a and the second disk-shaped yoke 8b, respectively. And a second ring-shaped yoke 8e. The first ring-shaped yoke 8d and the second disk-shaped yoke 8b are connected by a cylindrical connecting member 9. Thereby, the magnetic circuit forms the same magnetic gap 11 as in the first embodiment. Further, the ring-shaped magnet 17 is supported on the inner wall of the housing 1 by, for example, three points via the drive unit support member 13.

  About operation | movement of the jet flow generator 20, since it is the same as that of the jet flow generator 10 of the said 1st Embodiment, description is abbreviate | omitted. Also in the present embodiment, the jet flow generator 20 can be thinned in the Z direction by configuring the magnetic circuit of the drive unit 15 as described above. Further, since the diaphragms 3a and 3b are driven in opposite phases as described above, the vibrations (variations in the center of gravity) of the diaphragms can be canceled out, and the vibration of the entire jet flow generating device 20 can be suppressed as much as possible.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In addition, in this embodiment, the same code | symbol is attached | subjected about the location which becomes the structure and function similar to the jet generators 10 and 20 in the said 1st and 2nd embodiment, and description is abbreviate | omitted or simplified.

  FIG. 6 is a view showing the jet flow generating device 30 in the present embodiment. The drive unit 15 in the first embodiment forms a so-called inner magnet type magnetic circuit in which the columnar magnet 7 is arranged inside the coils 5a and 5b. However, the drive unit 15 in the present embodiment A magnet 17 forms a so-called middle magnet type magnetic circuit arranged between the coils 5a and 5b.

  That is, the drive unit 15 in the present embodiment has a configuration in which the ring-shaped magnet 17 and the connection member 9 of the jet flow generating device 20 in the second embodiment are interchanged. Specifically, the ring-shaped magnet 27 is provided so as to be sandwiched between the first ring-shaped yoke 8d and the second disk-shaped yoke 8b, and the first ring-shaped yoke 8d and the second ring-shaped yoke are provided. The yoke 8e is connected by a connecting member 9. The connecting member 9 is supported on the inner wall of the housing 1 by, for example, three points by the driving portion support member 13, so that the driving portion 15 is supported by the housing 1.

  Since the operation of the jet flow generating device 30 is the same as that of the jet flow generating devices 10 and 20 of the first and second embodiments, description thereof is omitted. Also in the present embodiment, by configuring the magnetic circuit of the drive unit 15 as described above, the jet flow generator 30 can be thinned in the Z direction, and the diaphragms 3a and 3b are driven in reverse phase. Therefore, it is possible to counteract the vibration of each diaphragm (the fluctuation of the center of gravity) and suppress the vibration of the entire jet flow generating device 30 as much as possible.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In addition, in this embodiment, the same code | symbol is attached | subjected about the location which becomes the structure and function similar to the jet flow generator 10 in the said 1st Embodiment, and description is abbreviate | omitted or simplified.

  The jet flow generating device 40 according to the present embodiment has a configuration in which a chamber 22 and a chamber 32 are newly added to the casing 1 of the jet flow generating device 10 according to the first embodiment. That is, the chamber 22 is formed in the upper part (vibration direction R1 direction) of the diaphragm 3a supported on the inner wall of the casing 41, and the chamber 32 is formed in the lower part (vibration direction R2 direction) of the diaphragm 3b. Has been. The chambers 22 and 32 have an opening 21 and an opening 31 that communicate with the outside of the housing 41, respectively. The volumes of the chambers 22 and 32 are formed such that the sum of the volumes of the two chambers is substantially equal to the volume of the chamber 12 (excluding the volume of the drive unit 15).

  Next, the operation of the jet generating device 40 will be described. The diaphragms 3a and 3b are driven in reverse phase in the same manner as in the above embodiments. When the diaphragm 3a is driven in the R1 direction and the diaphragm 3b is driven in the R2 direction, the volume of the chamber 12 is increased and the volumes of the chamber 22 and the chamber 32 are decreased. As the volume changes, the pressure in the chamber 12 decreases, and the pressure in the chamber 22 and the chamber 32 increases. Thereby, air in each chamber is discharged as a pulsating flow from the openings 21 and 31 of the chamber 22 and the chamber 32, and air outside the housing 41 is sucked into the chamber 12 through the opening 2. .

  On the other hand, when the diaphragm 3a is driven in the R2 direction and the diaphragm 3b is driven in the R1 direction, the volume of the chamber 12 decreases and the volumes of the chamber 22 and the chamber 23 increase. With this volume change, the pressure in the chamber 12 increases and the pressure in the chamber 22 and the chamber 32 decreases. As a result, the air in the chamber 12 is discharged as a pulsating flow through the opening 2, and the air outside the housing 41 passes through the openings 21 and 31 of the chamber 22 and the chamber 32, and flows into the chamber 22 and the chamber 32. Inhaled.

  Thus, in this embodiment, since the housing | casing 41 is provided with three chambers and each opening, discharge amount can be increased and air can be discharged toward a heat generating body etc. more efficiently.

  Further, when the diaphragms are driven in opposite phases, the sound generated in the upper and lower chambers 22 and 32 and the sound generated in the middle chamber 12 are also in opposite phases, so the sounds are canceled out. Thereby, the noise of the jet generator 40 can be suppressed as much as possible.

  Further, in the jet flow generating device 40, not only noise due to driving of each diaphragm but also noise due to wind noise of air discharged or sucked from each opening is generated. However, in the present embodiment, since there are three openings, noise due to the wind noise can be suppressed by equalizing the speed of air discharged or sucked from each opening.

  For this purpose, the sum of the opening areas of the plurality of openings 2 of the chamber 12 may be formed to be equal to the sum of the opening areas of the plurality of openings 21 and 31 of the chambers 22 and 32. That is, when the numerical aperture of each chamber is the same, the opening area of the opening 2 is formed so as to be twice the opening area of the opening 21 and the opening 31. Alternatively, when the opening area of each opening of each chamber is the same, the number of openings 2 of the chamber 12 is formed to be twice the number of openings 21 and 31 of the chambers 22 and 32.

  The present invention is not limited to the embodiments described above, and various modifications can be made.

  In the fourth embodiment, the two jet chambers are added to the jet generator 10 of the first embodiment. Of course, the jet generator 20 of the second embodiment and the jet generator of the third embodiment are used. It is possible to configure a jet flow generating apparatus having three chambers by adding two chambers to 30.

  The present invention can also be applied to a cooling device by combining each of the jet generating devices and a heat radiating member such as a heat sink.

  The present invention can also be applied as an electronic device on which each jet generating device is mounted. FIG. 8 is a perspective view showing a state in which the jet flow generating device 10 and the like shown in the above drawings are mounted on the PC 150 as an electronic device. The synthetic jet supplied from the jet generating device 10 is blown onto the heat sink 146, and air with heat is discharged from the exhaust port 151 of the PC housing provided behind the heat sink 146.

  In FIG. 8, a laptop PC is taken as an example of the electronic device, but a desktop PC may be used. Not only a PC but also a PDA (Personal Digital Assistance), an electronic dictionary, a camera, a display device, an audio / visual device, a projector, a mobile phone, a game device, a car navigation device, a robot device, and other electrical appliances.

It is a perspective view which shows the jet flow generator which concerns on the 1st Embodiment of this invention. It is AA 'sectional drawing of the jet flow generator shown in FIG. It is B-B 'sectional drawing of the jet flow generator shown in FIG. It is the figure which showed the example of a connection of each input terminal of the drive part 15 in 1st Embodiment. It is a perspective view which shows the jet flow generator which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the jet flow generator which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the jet flow generator which concerns on the 4th Embodiment of this invention. It is a perspective view which shows the state by which the jet flow generator 10 grade | etc., Was mounted in PC150 as an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 41 ... Housing | casing 2, 21, 31 ... Opening 3a ... Vibration plate 3b ... Vibration plate 4a, 4b ... Coil bobbin 5a, 5b ... Coil 6a ... Elastic support member 7, 17, 27 ... Magnet 8a ... 1st disc -Shaped yoke 8b ... second disk-shaped yoke 8c ... cylindrical yoke 8f ... columnar yoke 8d ... first ring-shaped yoke 8e ... second ring-shaped yoke 9 ... connecting member 10, 20, 30, 40 ... jet Generator 11 ... Magnetic gap 12, 22, 32 ... Chamber 13 ... Driver support member 14 ... Drive signal generator 15 ... Driver 146 ... Heat sink 150 ... PC

Claims (19)

A first diaphragm;
A second diaphragm facing the first diaphragm;
A first chamber formed between the first and second diaphragms, and a first opening communicating with the first chamber, wherein gas is contained therein; A housing that supports the vibration plate of 2 to be capable of vibrating;
A driving unit disposed in the first chamber and configured to drive the first and second diaphragms in order to discharge the gas as a pulsating flow out of the housing through the first opening. A jet flow generator characterized by comprising. The jet generator according to claim 1,
The said drive part drives the said 1st diaphragm to the one side of the said vibration direction, and drives the said 2nd diaphragm to the opposite side to the said one side, The jet flow generator characterized by the above-mentioned. The jet generating device according to claim 2,
The drive unit is
A first coil provided on the first diaphragm and having a first outer diameter;
A second coil provided on the second diaphragm substantially concentrically with the first diaphragm and having a second inner diameter larger than the first outer diameter;
A jet flow generating device comprising: a magnet; and a magnetic circuit having a magnetic gap in which the first and second coils are disposed. The jet generator according to claim 3,
The jet generator according to claim 1, wherein the magnet is a cylindrical magnet disposed inside the first and second coils and having a diameter smaller than an inner diameter of the first coil. The jet generator according to claim 3,
The jet generator according to claim 1, wherein the magnet is a ring-shaped magnet disposed outside the first and second coils and having an inner diameter larger than an outer diameter of the second coil. The jet generator according to claim 3,
The magnet is disposed outside the first coil and inside the second coil, and has an inner diameter larger than the outer diameter of the first coil and an outer diameter smaller than the inner diameter of the second coil. A jet generating device characterized by being a ring-shaped magnet having a diameter. The jet generating device according to claim 2,
The housing is
One second chamber formed in a direction opposite to the first chamber in the vibration direction of the first diaphragm and sandwiching the first diaphragm;
A third chamber formed in a direction opposite to the first chamber in the vibration direction of the second diaphragm and sandwiching the second diaphragm;
A second opening in communication with the second chamber;
A jet flow generating apparatus comprising: a third opening communicating with the third chamber. The jet generator according to claim 7,
The first opening and the third opening are each provided in a first number, each having a first area,
Each of the second openings is provided by the first number, and each has a second area that is approximately twice the first area. The jet generator according to claim 7,
Each of the first opening and the third opening has a first opening area, and is provided in a first number.
The second opening has the first opening area, and is provided in a second number that is twice the first number. A first diaphragm;
A second diaphragm facing the first diaphragm;
One first chamber formed between the first diaphragm and the second diaphragm, the vibration direction of the first diaphragm, and sandwiching the first diaphragm One second chamber formed on the opposite side of the first chamber, the first chamber in the vibration direction of the second diaphragm and sandwiching the second diaphragm; Is a third chamber formed on the opposite side, a first opening communicating with the first chamber, a second opening communicating with the second chamber, and communicating with the third chamber. A third opening that supports the first and second diaphragms so that they can vibrate, and contains a gas inside.
It is disposed in the first chamber, and the gas is allowed to flow from the first chamber, the second chamber, and the third chamber through the first opening, the second opening, and the third opening, respectively. A jet generating apparatus comprising: a drive unit that drives the first diaphragm and the second diaphragm to discharge the pulsating flow outside the body. The jet generator according to claim 10,
The said drive part drives the said 1st diaphragm to the one side of the said vibration direction, and drives the said 2nd diaphragm to the opposite side to the said one side, The jet flow generator characterized by the above-mentioned. The jet generator according to claim 11,
The drive unit is
A first coil provided on the first diaphragm and having a first outer diameter;
A second coil provided on the second diaphragm substantially concentrically with the first diaphragm and having a second inner diameter larger than the first outer diameter;
A jet flow generating device comprising: a magnet; and a magnetic circuit having a magnetic gap in which the first and second coils are disposed. The jet generator according to claim 12,
The jet generator according to claim 1, wherein the magnet is a cylindrical magnet disposed inside the first and second coils and having a diameter smaller than an inner diameter of the first coil. The jet generator according to claim 12,
The jet generator according to claim 1, wherein the magnet is a ring-shaped magnet disposed outside the first and second coils and having an inner diameter larger than an outer diameter of the second coil. The jet generator according to claim 12,
The magnet is disposed outside the first coil and inside the second coil, and has an inner diameter larger than the outer diameter of the first coil and an outer diameter smaller than the inner diameter of the second coil. A jet generating device characterized by being a ring-shaped magnet having a diameter. The jet generator according to claim 11,
The first opening and the third opening are each provided in a first number, each having a first area,
Each of the second openings is provided by the first number, and each has a second area that is approximately twice the first area. The jet generator according to claim 11,
Each of the first opening and the third opening has a first opening area, and is provided in a first number.
The second opening has the first opening area, and is provided in a second number that is twice the first number. A heating element;
A first diaphragm; a second diaphragm facing the first diaphragm; a chamber formed between the first and second diaphragms; and an opening communicating with the chamber. And a housing containing gas inside and supporting the first and second diaphragms so as to vibrate, and disposed in the chamber, the gas flows toward the heating element through the opening. An electronic apparatus comprising: a jet generating device having a driving unit that drives the first and second diaphragms in order to discharge the liquid as a flow. A heating element;
A first diaphragm, a second diaphragm facing the first diaphragm, and a first chamber formed between the first diaphragm and the second diaphragm; One second chamber formed on the opposite side of the first chamber in the vibration direction of the first diaphragm and sandwiching the first diaphragm; and the second vibration A third chamber formed in the vibration direction of the plate and on the opposite side of the first chamber across the second vibration plate, and a first opening communicating with the first chamber A second opening that communicates with the second chamber, and a third opening that communicates with the third chamber, and supports the first and second diaphragms so that they can vibrate. And a housing containing gas in the first chamber, and the gas is disposed in the first chamber and the second chamber. And the third chamber and the second chamber for discharging as a pulsating flow toward the heating element through the first opening, the second opening, and the third opening, respectively. An electronic apparatus comprising: a jet generating device having a driving unit that drives a diaphragm.

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