JP2018012066A - Fluid discharge unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid discharge unit which can discharge a fluid with momentum, and can emit a good sound.SOLUTION: A fluid discharge unit 1 includes a cover member 100, a fluid discharge unit main body 200 which is covered with a cover member 100, and a shutter mechanism 300 which opens and closes a fluid discharge port 4a. An inner space 7a surrounded by a frame 75 is arranged on an opposite side to a side on which a pressurization chamber 3 is positioned with respect to a movable plate 2. The inner space 7a communicates with a gap G between the fluid discharge unit main body 200 and the cover member 100 through an opening part 75e formed on the frame 75. A sound generated by vibration of the movable plate 2 is transmitted to the inner space 7a, is transmitted from the opening part 75e to the gap G, and is transmitted to an external from a sound discharge port 1a arranged between an opening end 101a of the cover member 100 and the fluid discharge unit main body 200.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a fluid discharge unit that moves a movable body to discharge a fluid in a pressurized chamber from a discharge port.

  2. Description of the Related Art Conventionally, a fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a discharge port is known. In the fluid discharge unit (air gun generator) described in Patent Document 1, an air discharge port is provided in a case (pressurizing chamber), and an air compression unit is provided in the case. The air compressing means of Patent Document 1 includes a diaphragm (movable plate), a rod disposed at the center of the diaphragm, a coil that moves the rod toward the diaphragm, and a return spring that returns the rod. When the coil is excited or demagnetized at a constant period, the rod reciprocates with respect to the diaphragm by the attractive force or repulsive force due to the electromagnetic force and the urging force of the return spring. Thereby, a diaphragm vibrates and an airflow is discharge | released from an air discharge port.

JP 2004-298607 A

  Patent Document 1 proposes using a speaker as an air compressing means. A fluid discharge unit having a voice coil type drive mechanism such as a speaker functions as an air cannon by being driven by a pulse signal (air cannon drive signal), and can also reproduce music by being driven by a music signal. Is possible. However, if a pressurized chamber and an air discharge port are provided in front of the diaphragm (movable plate) in order to release a vigorous air current, the sound will be muffled when music is played back, resulting in good sound. There is a problem that it is difficult to put out.

  In view of the above problems, an object of the present invention is to provide a fluid discharge unit capable of discharging a vigorous fluid and producing a good sound.

  In order to solve the above-described problem, the present invention provides a fluid discharge unit that moves a movable plate to discharge a fluid in a pressurized chamber from a fluid discharge port. The fluid discharge port is formed, and the fluid discharge unit is used together with the movable plate. A pressurizing chamber forming member that partitions the pressurizing chamber, a movable body that linearly moves the movable plate, a movable plate drive mechanism that includes a fixed body that movably holds the movable body, the fixed body, and the fixed body A cover member that covers an outer peripheral side of the pressurizing chamber forming member, and a gap that communicates with the outside is provided between the cover member, the pressurizing chamber forming member, and the fixed body, with respect to the movable plate Thus, the space opposite to the side where the pressurizing chamber is located communicates with the gap through an opening provided in the fixed body.

  According to the present invention, by attaching the cover member, a gap is formed between the cover member, the pressurizing chamber forming member, and the fixed body. The gap communicates with the outside and communicates with a space on the opposite side to the side where the pressurizing chamber is located with respect to the movable plate through an opening formed in the fixed body. Therefore, the sound generated by the vibration of the movable plate is transmitted to the opposite side to the pressurizing chamber and is transmitted through the gap formed by the cover member, so that the sound can be emitted outside without passing through the fluid discharge port. it can. Therefore, a vigorous air current can be discharged from the fluid discharge port and a good sound can be produced.

  In the present invention, it is desirable to have a shutter mechanism for opening and closing the fluid discharge port. The phase of the sound emitted from the fluid discharge port may be opposite to the phase of the sound transmitted through the space opposite to the side where the pressurizing chamber is located with respect to the movable plate. Sounds cancel each other out. Therefore, by closing the fluid discharge port with the shutter mechanism, it is possible to prevent the sounds in opposite phases from canceling each other and the sound from becoming weaker. Further, by closing the fluid discharge port, it is possible to reduce the possibility that foreign matter enters the pressure chamber from the fluid discharge port.

  In the present invention, the pressurizing chamber forming member includes an end plate portion in which the fluid discharge port is formed, and the shutter mechanism is a protection disposed on the side opposite to the pressurizing chamber with respect to the end plate portion. It is desirable to include a plate, a slide member that is slidably disposed between the end plate portion and the protection plate, and a shutter drive mechanism that drives the slide member. If it does in this way, since a slide member can be protected by a protection board, breakage of a slide member can be controlled. For example, even if the slide member is pushed to the side opposite to the fluid discharge direction, the slide member can be held by the end plate portion. In addition, since the slide member is protected by the protective plate, the slide member can be prevented from being damaged due to contact with an external object. Furthermore, since the slide member can be supported by the protective plate and the end plate portion, the operation of the slide member can be stabilized.

  In the present invention, it is desirable that an elastic member is disposed between at least one of the slide member and the end plate portion and between the slide member and the protective plate. If it does in this way, shakiness of the slide member by vibration can be controlled and vibration sound can be controlled. In addition, since at least one of the gap between the slide member and the end plate portion and the gap between the slide member and the protective plate can be closed by the elastic member, the possibility of leakage of fluid and sound from these gaps can be reduced. it can.

  In the present invention, the shutter drive mechanism includes a solenoid and a cam mechanism that converts a linear motion of the movable iron core of the solenoid into a rotational motion of the rotating member, and the slide member is based on the rotation of the rotating member, It is desirable to move to a closed position for closing the fluid discharge port and an open position for opening the fluid discharge port. In this way, the shutter drive mechanism can be configured compactly, which is advantageous for downsizing the shutter mechanism.

  In this invention, the said cover member is provided with the internal peripheral surface which forms the said clearance gap between the external peripheral surfaces of the said pressurization chamber formation member, and the said internal peripheral surface is with respect to a cylindrical surface and the said cylindrical surface. It is desirable that the opening is disposed on the inner peripheral side of the inclined surface. For example, it is desirable that the inclined surface has a diameter that increases toward the sound emission port provided at one end of the cylindrical surface. If it does in this way, the sound transmitted through an opening part will be reflected by an inclined surface, and will advance in the direction along a cylindrical surface. Therefore, since sound is easily transmitted along the cylindrical surface, a good sound can be emitted from one end of the cylindrical surface.

  In this invention, the said cover member is provided with the cylindrical part which one end opens, and the bottom part which plugs up the other end of the said cylindrical part, The said pressurization chamber formation member has the said fluid discharge port of the said cylindrical part. The movable plate driving mechanism is disposed between the pressurizing chamber forming member and the bottom, and is disposed on the inner peripheral side of the cylindrical portion toward the same side as the opening end. It is desirable that a sound discharge port is formed between the end and the outer peripheral surface of the pressurizing chamber forming member, and the gap communicates with the outside through the sound discharge port. If it does in this way, the sound leaked from the opposite side to a fluid discharge port and a sound discharge port can be decreased. Moreover, a sound can be emitted on the same side as the side from which the airflow is released. Therefore, it is easy for the user to transmit both stimulation and sound caused by airflow. In addition, an annular sound discharge port surrounding the fluid discharge port can be formed. In this case, it is possible to evenly output sounds having the same phase from all directions surrounding the fluid discharge port.

  According to the present invention, a gap is formed between the cover member and the pressure chamber forming member and the fixed body. The gap communicates with the outside and communicates with a space on the opposite side to the side where the pressurizing chamber is located with respect to the movable plate through an opening formed in the fixed body. Therefore, the sound generated by the vibration of the movable plate is transmitted to the opposite side to the pressurizing chamber and is transmitted through the gap formed by the cover member, so that the sound can be emitted outside without passing through the fluid discharge port. it can. Therefore, a vigorous air current can be discharged from the fluid discharge port and a good sound can be produced.

It is a perspective view of the fluid discharge | release unit to which this invention is applied. It is a disassembled perspective view of a fluid discharge unit. It is a top view of a cover member and a fluid discharge unit main body. It is sectional drawing (AA sectional drawing of FIG. 1) of a fluid discharge | release unit. It is sectional drawing (BB sectional drawing of FIG. 1) of a fluid discharge | release unit. It is the disassembled perspective view which looked at the fluid discharge | release unit main body and the shutter mechanism from the front side. It is the disassembled perspective view which looked at the fluid discharge | release unit main body and the shutter mechanism from the back side. It is operation | movement explanatory drawing of a shutter mechanism. FIG. 10 is a cross-sectional view of a fluid discharge unit according to Modification 1; FIG. 10 is a partial cross-sectional view of a shutter mechanism according to Modification 2.

  Hereinafter, an embodiment of a fluid discharge unit to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a perspective view of a fluid discharge unit 1 to which the present invention is applied, and FIG. 2 is an exploded perspective view of the fluid discharge unit of FIG. The fluid discharge unit 1 includes a cover member 100, a fluid discharge unit main body 200 in which a fluid discharge port 4a is formed, and a shutter mechanism 300 that opens and closes the fluid discharge port 4a. The fluid discharge unit 1 discharges the fluid in the pressurizing chamber 3 (see FIGS. 4 and 5) from the fluid discharge port 4a. In this specification, one side in the Z direction is defined as + Z direction, and the other side is defined as -Z direction. The fluid discharge port 4a faces the + Z direction, and the fluid is discharged in the + Z direction. In this specification, the + Z direction is the front side of the fluid discharge unit 1 and the −Z direction is the back side.

  The cover member 100 is a member that opens to the front side (+ Z direction), and covers the outer peripheral side and the back side (−Z direction) of the fluid discharge unit main body 200. The fluid discharge unit 1 includes an annular sound discharge port 1a that faces the same side (+ Z direction) as the fluid discharge port 4a, and can emit sound on the same side as the side from which the fluid is discharged. The sound discharge port 1 a is formed between the open end of the cover member 100 and the outer peripheral surface of the fluid discharge unit main body 200.

  The fluid discharge unit 1 is used by being mounted on a vehicle, for example, and discharges air in a lump state toward the driver in order to wake up the driver. In addition, the fluid discharge unit 1 is mounted on an amusement device and discharges air in a lump state toward the player in order to enhance the effect. Or the fluid discharge | release unit 1 is arrange | positioned in a movie theater, and discharge | releases air in the state of a lump toward a viewer, in order to improve a production effect. In addition, the fluid discharge | release unit 1 may discharge | release gas other than air and may discharge | release a liquid. Moreover, the fluid discharge | release unit 1 may discharge | release the gas containing a liquid, and may discharge | release the gas containing various components, such as a scent component and a stimulating component.

  Since the fluid discharge unit 1 can emit sound in addition to the fluid, it is also used as a speaker. For example, when mounted on a vehicle, it is used as a speaker for listening to music or radio. Further, when mounted in an amusement device or when placed in a movie theater, it is used as a speaker for playing sound effects and music in order to enhance the effect. Furthermore, when the fluid discharge unit 1 is driven by a synthesized signal obtained by synthesizing a drive signal for discharging fluid and a drive signal for generating sound, the fluid discharge unit 1 can release sound and fluid in conjunction with each other.

  The fluid discharge unit 1 can be attached to be rotatable around an axis directed in an arbitrary direction by using a support mechanism (not shown). For example, as shown in FIG. 1, it is supported so as to be rotatable around a rotation axis R orthogonal to the Z direction. In this way, since the direction of the fluid discharge unit 1 can be changed, the direction in which the fluid and sound are discharged can be adjusted. The fluid discharge unit 1 can also be supported so as to be rotatable around two orthogonal axes or around three orthogonal axes.

(Cover member)
FIG. 3 is a plan view of the cover member 100 and the fluid discharge unit main body 200. 4 and 5 are cross-sectional views of the fluid discharge unit 1, FIG. 4 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 5 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 1 to 5, the cover member 100 includes a cylindrical portion 101 that opens at one end and a bottom portion 102 that closes the other end of the cylindrical portion 101. The opening end 101a of the cylindrical portion 101 faces the front side (+ Z direction). The fluid discharge unit main body 200 is disposed on the inner peripheral side of the cylindrical portion 101. The back side of the fluid discharge unit main body 200 is covered with the bottom 102. The bottom portion 102 includes an annular flat surface portion 103 that is connected to the tubular portion 101, and a circular convex portion 104 that protrudes in the −Z direction from the center of the annular flat surface portion 103.

  The rear end portion of the fluid discharge unit main body 200 is disposed inside the circular convex portion 104. A gap G (see FIGS. 4 and 5) is formed in an annular shape between the outer peripheral surface of the fluid discharge unit main body 200 and the cylindrical portion 101. One end of the gap G communicates with the outside through the sound emission port 1 a, and the other end is closed by the annular flat surface portion 103. Boss portions 105 protruding in the + Z direction are formed at four locations at equal angular intervals on the annular flat surface portion 103. As shown in FIG. 5, the fluid discharge unit main body 200 is screwed to the boss portion 105 using a fixing screw 106.

  The cover member 100 includes a shutter mechanism housing portion 110 that projects radially outward from one place in the circumferential direction of the tubular portion 101. As shown in FIG. 2, the shutter mechanism accommodating portion 110 includes a substantially rectangular side plate portions 111 and 112 that are arranged apart from each other in the circumferential direction and a connecting plate portion 113 that connects the radially outer edges of the side plate portions 111 and 112. And a bottom plate portion 114 that closes the −Z direction side of the recessed space surrounded by the side plate portions 111 and 112 and the connecting plate portion 113. As shown in FIG. 4, a part of a shutter mechanism 300 described later is accommodated in the shutter mechanism accommodating portion 110.

(Fluid discharge unit body and shutter mechanism)
6 is an exploded perspective view of the fluid discharge unit main body 200 and the shutter mechanism 300 as viewed from the front side, and FIG. 7 is an exploded perspective view of the fluid discharge unit main body 200 and the shutter mechanism 300 as viewed from the back side. As shown in FIGS. 2 and 4 to 7, the fluid discharge unit main body 200 is movable to partition the pressure chamber 3 together with the pressure chamber forming member 4 in which the fluid discharge port 4 a is formed and the pressure chamber forming member 4. A plate 2 and a movable plate driving mechanism 5 that linearly moves the movable plate 2 in the Z direction are provided.

(Pressure chamber forming member)
The pressurizing chamber forming member 4 includes a cylindrical portion 41 having a circular cross section extending in the Z direction, a circular end plate portion 42 that closes an end portion on the front side (+ Z direction) of the cylindrical portion 41, and a cylindrical portion. 41 is provided with an overhanging portion 43 projecting from the edge on the back side (-Z direction) of 41 to the outer peripheral side. The overhang portions 43 are provided at four locations that are equiangularly spaced in the circumferential direction, and are arranged so as to have a substantially square outer shape as a whole when viewed in the Z direction. As shown in FIGS. 4 and 5, the pressurizing chamber 3 is formed inside the pressurizing chamber forming member 4. The movable plate 2 is disposed on the back side of the pressurizing chamber 3, and the end plate portion 42 faces the movable plate 2 in the Z direction. A fluid discharge port 4 a is formed at the center of the end plate portion 42. The fluid discharge port 4 a is a circular opening that passes through the center of the end plate portion 42. When viewed in the Z direction, the center of the fluid discharge port 4a coincides with the center of the movable plate 2.

  A shutter mechanism 300 is attached to the pressurizing chamber forming member 4. As shown in FIG. 6, a concave portion 44 having an arcuate cross section extending in the Z direction is formed on the outer peripheral surface of the pressurizing chamber forming member 4. In addition, a pair of brackets 45 are formed at two positions separated in the Z direction at the angular position where the recess 44 is provided. The recess 44 and the bracket 45 are located on the inner peripheral side of the shutter mechanism accommodating portion 110 provided in the cover member 100. A cam cylinder 334 and a rotating shaft 335, which will be described later, are rotatably attached to the bracket 45.

  As shown in FIG. 6, the end plate portion 42 of the pressurizing chamber forming member 4 is formed with screw holes at four locations. An annular rib 422 is formed along the outer peripheral edge of the end plate portion 42. Two of the four screw holes are formed in a cylindrical boss portion 421 protruding from the end plate portion 42. The boss portion 421 has an independent columnar shape that is not connected to the annular rib 422. The other two screw holes are formed in a boss portion connected to the annular rib 422.

  The annular rib 422 is notched at the angular position where the recess 44 and the bracket 45 are provided, and the linear rib 423 extends radially inward from the notch position. Arc-shaped ribs 424 are formed on the inner peripheral side of the annular rib 422. The arc-shaped rib 424 has an arc shape centering on the rotation axis L of the cam cylinder 334 and the rotation shaft 335 attached to the bracket 45. Three guide ribs 425 having a protruding height lower than that of the arc-shaped rib 424 are formed on the side of the arc-shaped rib 424 where the bracket 45 is located. Each of the three guide ribs 425 has an arc shape with the rotation axis L as the center. The fluid discharge port 4 a is disposed between two of the three guide ribs 425 on the outer peripheral side. An annular convex portion 426 is formed at the edge of the fluid discharge port 4a. The protruding height of the annular protrusion 426 is substantially the same as that of the guide rib 425.

(Shutter mechanism)
The shutter mechanism 300 includes a slide member 310 that opens and closes the fluid discharge port 4a, a protection plate 320, a shutter drive mechanism 330, and an LED unit 340. The protection plate 320 is disposed on the opposite side (+ Z direction) to the pressurizing chamber 3 with respect to the end plate portion 42. The protection plate 320 includes a circular plate portion 321 and an arm portion 322 that extends radially outward from the outer peripheral edge of the circular plate portion 321. The circular plate portion 321 is fixed to the end plate portion 42 by four fixing screws 350. In the center of the circular plate portion 321, a circular opening 323 having substantially the same diameter as the fluid discharge port 4 a is formed. The fluid discharge port 4 a communicates with the outside through the circular opening 323.

  As shown in FIG. 7, the circular plate portion 321 is formed with annular convex portions 324 at two locations on the surface facing the end plate portion 42. By fitting these two annular protrusions 324 and the bosses 421 formed on the end plate part 42, the protection plate 320 is positioned at a position where the arm part 322 closes the upper end of the shutter mechanism housing part 110. The A rectangular opening 325 is formed in the arm portion 322, and a substantially rectangular parallelepiped LED unit 340 is attached to the rectangular opening 325. The LED unit 340 emits light in various modes. For example, light is emitted in a manner linked to the fluid and sound discharged from the fluid discharge unit 1. Or you may light-emit regardless of discharge | release of a fluid or a sound. The LED unit 340 may be omitted.

The circular plate portion 321 has substantially the same diameter as the end plate portion 42 and contacts the annular rib 422. Therefore, a gap in which the slide member 310 can be disposed is formed between the circular plate portion 321 and the end plate portion 42 (see FIGS. 4 and 5). As shown in FIG. 7, the circular plate portion 321 includes three arc-shaped guide ribs 326 formed at positions facing the three guide ribs 425 formed on the end plate portion 42.

  The shutter drive mechanism 330 includes a solenoid 331, a movable member 333 coupled to the movable iron core 332 of the solenoid 331, a cam cylinder 334 disposed between the movable member 333 and the pressurizing chamber forming member 4, and a cam cylinder 334. The rotation shaft 335 is fixed to the center of the shaft. The solenoid 331 is disposed in the shutter mechanism housing portion 110 of the cover member 100 while being held by the support frame 339. The support frame 339 is fixed to the shutter mechanism housing portion 110 by a fixing screw 115 (see FIGS. 1 and 2). The cam cylinder 334 is disposed between a pair of brackets 45 formed on the pressurizing chamber forming member 4 and is rotatably supported by the bracket 45 via a rotation shaft 335. The rotation shaft 335 and the cam cylinder 334 are rotation members that rotate about a rotation axis L extending in the Z direction.

  The movable member 333 is formed with a cam pin 336 (see FIGS. 4 and 7) that protrudes toward the outer peripheral surface of the cam cylinder 334. A helical cam groove 337 (see FIGS. 4 and 6) with which the cam pin 336 engages is formed on the outer peripheral surface of the cam cylinder 334. The solenoid 331 is switched to a state in which the movable iron core 332 protrudes in the + Z direction and a state in which the movable iron core 332 is pulled in the −Z direction by energization control. When the movable iron core 332 moves in the Z direction, the movable member 333 moves in the Z direction together with the movable iron core 332. The cam pin 336 provided on the movable member 333 and the cam groove 337 provided on the cam cylinder 334 constitute a cam mechanism 338 that converts the linear motion of the movable iron core 332 in the Z direction into the rotational motion of the rotary shaft 335.

  The slide member 310 includes a shutter plate 311 disposed between the circular plate portion 321 and the end plate portion 42, and a connecting portion 312 that connects the shutter plate 311 and the rotation shaft 335. The connecting portion 312 is bent and extends in the −Z direction from the end portion of the shutter plate 311. The shutter plate 311 rotates about the rotation axis L between the circular plate portion 321 and the end plate portion 42 based on the rotation of the rotation shaft 335. The shutter plate 311 is supported from both sides in the Z direction by three guide ribs 425 formed on the end plate portion 42 and guide ribs 326 formed on the circular plate portion 321.

  FIG. 8 is an explanatory diagram of the operation of the shutter mechanism 300. FIG. 8A shows a state where the fluid discharge port 4a is closed, and FIG. 8A shows a state where the fluid discharge port 4a is opened. As shown in FIGS. 6 to 8, the shutter plate 311 includes an annular portion 315 in which a substantially circular closing portion 313 capable of closing the fluid discharge port 4a and a circular opening 314 having substantially the same shape as the fluid discharge port 4a are formed. And a straight arm portion 316 extending from the closing portion 313 toward the connecting portion 312. The closing part 313 and the annular part 315 are arranged side by side in the circumferential direction around the rotation axis L. The shutter plate 311 has a closed position 311A (see FIG. 8A) where the fluid discharge port 4a and the closing portion 313 overlap, and an open position where the circular opening 314 formed in the annular portion 315 and the fluid discharge port 4a overlap. Move to 311B (see FIG. 8B).

  4 shows a state where the shutter plate 311 has moved to the closed position 311A. In the closed position 311A, an annular convex portion 426 (see FIG. 6) formed at the edge of the fluid discharge port 4a comes into contact with the outer peripheral edge of the closed portion 313. Therefore, the fluid in the pressurizing chamber 3 does not leak from the fluid discharge port 4a. 5 shows a state where the shutter plate 311 has moved to the open position 311B. In the open position 311B, the annular convex portion 426 formed on the edge of the fluid discharge port 4a contacts the annular portion 315, and the fluid discharge port 4a, the circular opening 314, and the circular opening 323 overlap each other. Therefore, the movable plate 2 can be moved in the Z direction, and the fluid in the pressurizing chamber 3 can be discharged to the outside through the fluid discharge port 4a, the circular opening 314, and the circular opening 323.

(Movable plate drive mechanism)
As shown in FIG. 6, the movable plate 2 is a circular rigid body when viewed in the Z direction, and is formed of a resin film or the like. As shown in FIGS. 4 and 5, the movable plate 2 of this embodiment has a curved plate shape in which the front side is recessed (that is, swells in the −Z direction). The movable plate 2 may have a curved plate shape in which the back surface side is depressed (that is, bulges in the + Z direction) or a flat plate shape.

  4 and 5, the movable plate drive mechanism 5 includes a movable body 6 that linearly moves the movable plate 2 in the Z direction, a fixed body 7 that holds the movable body 6 so as to be movable, and a movable body. 6 and a support member 8 connecting the fixed body 7 and a damper member 9 disposed between the movable body 6 and the fixed body 7. The movable body 6 includes a cylindrical bobbin 61 whose axial direction is the Z direction, and a driving coil 62 wound around the outer peripheral surface of the bobbin 61. The bobbin 61 is formed of an insulating material such as an insulating resin material. The movable plate 2 is attached to the upper end side of the bobbin 61 via a movable side fixing portion 8a that constitutes the support member 8 to be described later.

The driving coil 62 is fixed to the outer peripheral surface of the bobbin 61. The end of the drive coil 62 is FFC (Flexible Flat Cable) or FPC (Flexible).
It is connected to one end of a cable (not shown) made of Printed Circuits. The other end of this cable is connected to a substrate (not shown). The cable to which the end of the driving coil 62 is connected may be a lead wire.

  The fixed body 7 includes a cylindrical driving magnet 71 whose axial direction is the Z direction. The drive magnet 71 has a thick cylindrical shape, and its inner diameter is larger than the outer diameter of the bobbin 61. The drive magnet 71 is magnetized so that the magnetic poles on the upper end surface and the magnetic poles on the lower end surface are different. For example, the driving magnet 71 is magnetized such that the magnetic pole on the upper end surface side is N and the magnetic pole on the lower end surface side is S. The fixed body 7 includes a columnar shaft 72 inserted on the inner peripheral side of the bobbin 61, a disk-shaped fixing plate 73 fixed to the lower end surface of the driving magnet 71, and the top of the driving magnet 71. A disk-shaped fixing plate 74 fixed to the end surface and a frame 75 to which the pressurizing chamber forming member 4 is fixed are provided. The drive magnet 71, the shaft 72, the fixed plate 73, the fixed plate 74, and the frame 75 are arranged coaxially.

  The fixing plates 73 and 74 are made of a soft magnetic material. The fixed plate 73 is fixed to the lower end surface of the drive magnet 71, and the fixed plate 74 is fixed to the upper end surface of the drive magnet 71. The drive magnet 71 is fixed to the inner peripheral side of the circular convex portion 104 of the cover member 100 by light press fitting. A circular through hole 73 a for fixing the shaft 72 is formed at the center of the fixing plate 73. In the center of the fixed plate 74, a round hole-like through hole 74a for arranging the bobbin 61 and the like is formed.

  The shaft 72 is made of a soft magnetic material. The shaft 72 has a cylindrical shape and is disposed on the inner peripheral side of the driving magnet 71. A fixed portion 72 a that protrudes in the −Z direction is formed at the lower end of the shaft 72. The fixed portion 72 a has a columnar shape that is slightly thinner than the other portions of the shaft 72, and is fixed by being inserted into the through hole 73 a of the fixing plate 73. The length of the shaft 72 (length in the Z direction) excluding the fixed portion 72a is substantially equal to the total dimension of the length of the driving magnet 71 in the Z direction and the thickness of the fixing plate 74.

In this embodiment, the shaft 72 and the fixing plates 73 and 74 formed of a soft magnetic material are used to move from the upper end surface of the driving magnet 71 toward the lower end surface (or from the lower end surface of the driving magnet 71 toward the upper end surface). ) A magnetic path around which the magnetic lines of force circulate is formed. This magnetic path passes through the drive coil 62 between the upper end portion of the outer peripheral surface of the shaft 72 and the inner peripheral surface of the fixing plate 74 (that is, the side surface of the through hole 74a). A magnetic gap is formed between the upper end portion of the plate and the inner peripheral surface of the fixed plate 74. Thus, the shaft 72 is inserted on the inner peripheral side of the bobbin 61 so that a magnetic path passing through the driving coil 62 is formed by the magnetic force generated by the driving magnet 71. The inner diameter of the bobbin 61 is larger than the outer diameter of the shaft 72, and a gap is formed between the bobbin 61 and the shaft 72 so that the bobbin 61 and the shaft 72 do not contact each other.

  The frame 75 includes a substantially annular bottom portion 75a, a diameter-expanding portion 75b that rises from the outer periphery of the bottom portion 75a in a stepwise manner in the + Z direction, and a flange portion that extends radially outward from the upper end of the diameter-expanding portion 75b. 75c and a cylindrical portion 75d extending in the −Z direction from the edge of the central hole of the bottom portion 75a. The frame 75 is formed with four air vent openings 75e that penetrate the enlarged diameter portion 75b in the radial direction at equal angular intervals in the circumferential direction. In the enlarged diameter portion 75b, a region between the adjacent opening portions 75e is a support column portion 75f that connects the bottom portion 75a and the flange portion 75c. The column portions 75f are arranged at four locations at equal angular intervals in the circumferential direction.

  The frame 75 is fixed to the fixing plate 74 in a state where the cylindrical portion 75 d of the frame 75 is inscribed in the through hole 74 a of the fixing plate 74 and the bottom portion 75 a of the frame 75 is in contact with the upper surface of the fixing plate 74. A bobbin 61 around which a driving coil 62 is wound is disposed on the inner peripheral side of the cylindrical portion 75d. There is a gap between the driving coil 62 and the inner peripheral surface of the cylindrical portion 75d. The length of the bobbin 61 in the Z direction is longer than the thickness of the fixed plate 74. Further, the length in the Z direction of the winding region of the driving coil 62 is also longer than the thickness of the fixed plate 74.

  The flange 75c has a substantially square outer shape when viewed from the Z direction. The flange portion 75 c comes into contact with the lower end surface of the tubular portion 41 and the overhang portion 43 of the pressurizing chamber forming member 4 from the back side (−Z direction). The overhanging portion 43 and the flange portion 75 c are fixed by being screwed to the boss portion 105 of the cover member 100 by a fixing screw 106. That is, the fixed body 7 is fixed to the pressurizing chamber forming member 4 and the cover member 100 via the frame 75.

  The support member 8 that connects the movable body 6 and the fixed body 7 includes an annular movable-side fixed portion 8 a to which the movable plate 2 and the bobbin 61 are fixed, and an annular fixed-side fixed portion 8 b that is fixed to the fixed body 7. And an annular folded portion 8c that connects the movable side fixed portion 8a and the fixed side fixed portion 8b. The fixed side fixing portion 8 b is provided at the outer peripheral end of the support member 8. The folded portion 8c is arranged on the inner peripheral side of the fixed side fixed portion 8b and is folded once so as to swell in the + Z direction. As shown in FIGS. 4 and 5, the vertical cross-sectional shape of the folded portion 8 c when no current is supplied to the driving coil 62 is a substantially semicircular arc shape.

  The fixed side fixing portion 8b and the folded portion 8c are integrally formed, and the movable side fixed portion 8a formed separately is fixed to the folded portion 8c by bonding or the like. The fixed side fixing portion 8b and the folded portion 8c are formed of an elastic material such as rubber, resin, or compressed sponge. On the other hand, the movable side fixing portion 8a is a rigid body formed of paper or resin.

  The movable side fixing portion 8a has a substantially conical shape whose diameter increases in the + Z direction. The upper end portion of the bobbin 61 is fixed to the inner peripheral edge of the movable side fixing portion 8a. The outer peripheral end portion of the movable plate 2 is fixed to the outer peripheral end portion of the movable side fixing portion 8a. The fixed side fixing portion 8 b is fixed to the upper surface of the flange portion 75 c of the frame 75.

The damper member 9 has an annular shape, and has a movable body side fixing portion 9a fixed to the bobbin 61, a fixed body side fixing portion 9b fixed to the frame 75, and a bellows shape connecting the movable body side fixing portion 9a and the fixed body side fixing portion 9b. The spring part 9c is provided. The fixed body side fixing portion 9b is fixed in contact with the stepped surface of the enlarged diameter portion 75b from the + Z direction, and the movable body side fixing portion 9a is fixed to the outer peripheral surface of the bobbin 61. The damper member 9 positions the bobbin 61 in a direction crossing the Z direction. Further, the position of the bobbin 61 in the Z direction when no current is supplied to the driving coil 62 is defined by the damper member 9.

(Operation of fluid discharge unit 1)
In the fluid discharge unit 1, the pressurizing chamber 3 defined by the movable plate 2, the pressurizing chamber forming member 4, the support member 8, and the flange 75 c of the frame 75 is disposed on the + Z direction side of the movable plate 2. The pressurizing chamber 3 is a space that applies pressure to air (compresses air).

  In the fluid discharge unit 1, when the air flow is discharged from the fluid discharge port 4a, the shutter mechanism 300 is driven to open the fluid discharge port 4a. That is, the energization of the solenoid 331 is controlled to move the movable iron core 332 in the Z direction, and the rotating shaft 335 is rotated to move the shutter plate 311 to the open position 311B.

  The fluid discharge unit 1 drives the movable plate drive mechanism 5 by supplying a pulsed current to the drive coil 62. When one pulse of current is supplied, the movable body 6 (bobbin 61 and driving coil 62) reciprocates once in the Z direction by the Lorentz force that the current receives from the magnetic field. At this time, the movable plate 2 also reciprocates once in the Z direction. The movable plate 2 is pulled in the −Z direction and then compresses the air in the pressurizing chamber 3 when it jumps out in the + Z direction. As a result, the air in the pressurizing chamber 3 is discharged from the fluid discharge port 4a. Since the air discharged from the fluid discharge port 4a entrains the air outside the fluid discharge port 4a, the vortex ring-shaped air current jumps out in the + Z direction of the fluid discharge port 4a. By continuously supplying a pulsed current, an air flow can be continuously generated from the fluid discharge port 4a.

  Further, in the fluid discharge unit 1, when the sound is emitted from the sound discharge port 1a, the shutter mechanism 300 is driven to close the fluid discharge port 4a. That is, the energization of the solenoid 331 is controlled to move the movable iron core 332 to the opposite side to the opening operation, and the rotating shaft 335 is rotated to the opposite side to the opening operation to move the shutter plate 311 to the closed position 311A. .

  When the movable plate 2 and the movable plate drive mechanism 5 function as a speaker, the fluid discharge unit 1 is movable by supplying a current corresponding to a sound signal such as voice, music, and sound effects to the drive coil 62. The plate drive mechanism 5 is driven. As a result, the movable plate 2 vibrates and air vibration (sound) is generated. In this embodiment, the generated sound is configured to be output to the front side (+ Z direction) of the fluid discharge unit 1. That is, as shown in FIG. 5, the fluid discharge unit 1 includes a first sound transmission path S <b> 1 toward the fluid discharge port 4 a through the pressurizing chamber 3 located on the front side (+ Z direction) of the movable plate 2. A second sound transmission path S2 is provided that travels toward the sound emission port 1a via the inner space 7a located on the back side (−Z direction) of the movable plate 2.

  The sound from the first sound transmission path S1 and the sound from the second sound transmission path S2 may be in opposite phases, and if they are in opposite phases, they may cancel each other. Therefore, in the fluid discharge unit 1, when the sound is emitted, the fluid discharge port 4a is closed by the shutter mechanism 300 as described above, so that the sound from the first sound transmission path S1 is not emitted to the outside. Note that when the sound and the fluid are output simultaneously, the fluid discharge port 4a is opened.

(Second sound transmission path)
As shown in FIGS. 4 and 5, the movable body 6 is disposed on the back side (−Z direction) of the movable plate 2, and the movable plate 2 and the movable body 6 are connected to the frame 75 of the fixed body 7 by the support member 8. Connected. An inner space 7 a surrounded by the frame 75 is provided on the back side (−Z direction) of the movable plate 2. In the inner space 7a, the movable plate 2, the movable body 6, and the movable side fixing portion 8a of the support member 8 move in the Z direction. The inner space 7 a communicates with a gap G provided on the outer peripheral side of the frame 75 through an air vent opening 75 e formed in the enlarged diameter portion 75 b of the frame 75. The openings 75e are formed at four locations at equal angular intervals in the circumferential direction. In this embodiment, the boss portion 105 is disposed at the center in the circumferential direction of the opening 75e. Accordingly, the gap G and the inner space 7a communicate with each other through both sides of the boss portion 105 in the circumferential direction. The position, size, and number of the opening 75e can be changed as appropriate. For example, the opening 75e may be formed at a position different from the angular position of the boss 105.

  The gap G is formed in an annular shape between the cylindrical portion 101 of the cover member 100 and the outer peripheral surface of the fluid discharge unit main body 200. The gap G extends in the Z direction, and one end thereof communicates with the outside through an annular sound emission port 1 a facing the front side of the fluid discharge unit 1. The second sound transmission path S2 is a path from the inner space 7a provided on the back side of the movable plate 2 to the sound emission port 1a via the opening 75e and the gap G of the frame 75. On the other hand, the other end side (−Z direction side) of the gap G is a closed space closed by the cover member 100. That is, the gap G is not in communication with the outside except for the sound emission port 1a, and has a structure in which sound does not leak to the outside from a portion other than the sound emission port 1a.

(Function and effect)
As described above, in the fluid discharge unit 1 of this embodiment, the gap G is formed between the fluid discharge unit main body 200 and the cover member 100. The gap G communicates with the outside through an annular sound discharge port 1 a provided between the opening end 101 a of the cover member 100 and the fluid discharge unit main body 200. Further, an inner space 7 a surrounded by a frame 75 is provided on the side opposite to the side where the pressurizing chamber 3 is located with respect to the movable plate 2, and the inner space 7 a is provided through an opening 75 e formed in the frame 75. It communicates with the gap G. Therefore, the sound generated by the vibration of the movable plate 2 is transmitted to the inner space 7a located on the side opposite to the pressurizing chamber 3, and is transmitted to the sound discharge port 1a through the opening 75e and the gap G. Sound can be emitted outside without going through 4a. Therefore, a vigorous air current can be discharged from the fluid discharge port 4a and a good sound can be produced. Further, in this embodiment, since sound and fluid can be output from one device, a low-cost and space-saving sound and fluid discharge unit can be provided.

  In this embodiment, a shutter mechanism 300 that opens and closes the fluid discharge port 4a is provided. When sound is emitted from the fluid discharge port 4a, the phase of the sound may be opposite to the phase of the sound transmitted to the movable plate 2 on the opposite side of the pressurizing chamber 3, and in this case, the sound Will cancel each other. Therefore, by closing the fluid discharge port 4a with the shutter mechanism 300, it is possible to prevent the sounds having opposite phases from canceling each other and the sound from becoming weaker. In addition, the possibility of foreign matter entering the pressurizing chamber 3 from the fluid discharge port 4a can be reduced by closing the fluid discharge port 4a.

  The pressurizing chamber forming member 4 of this embodiment includes an end plate portion 42 in which a fluid discharge port 4 a is formed, and the shutter mechanism 300 is a protection disposed on the opposite side of the pressurizing chamber 3 with respect to the end plate portion 42. A plate 320, a slide member 310 slidably disposed between the end plate portion 42 and the protection plate 320, and a shutter drive mechanism 330 that drives the slide member 310 are provided. In such a structure, since the slide member 310 can be protected by the protection plate 320, damage to the slide member 310 can be suppressed. For example, even if the slide member 310 is pushed to the opposite side to the fluid discharge direction, the end plate portion 42 can hold the slide member 310. Further, it is possible to prevent the slide member 310 from being damaged by contacting an external object. Furthermore, since the slide member 310 can be supported by the protection plate 320 and the end plate portion 42, the operation of the slide member 310 can be stabilized.

  The shutter drive mechanism 330 of this embodiment has a structure in which the linear motion of the movable iron core 332 of the solenoid 331 is converted into the rotational motion of the rotating shaft 335 and the cam cylinder 334 by the cam mechanism 338 and the slide member 310 is rotated, and the structure is compact. Has been. Therefore, it is advantageous for downsizing the shutter mechanism 300.

  Since the cover member 100 of this embodiment covers the back side of the fluid discharge unit main body 200, the sound leaking from the side opposite to the fluid discharge port 4a can be reduced. An annular sound discharge port 1a facing the same side as the fluid discharge port 4a is formed between the open end 101a of the cover member 100 and the outer peripheral surface of the fluid discharge unit main body 200 (the outer peripheral surface of the pressurizing chamber forming member 4). Since it is provided, a sound can be emitted on the same side as the side from which the airflow is discharged from the fluid discharge port 4a. Therefore, it is easy for the user to transmit stimulation and sound due to airflow. In addition, since the sound discharge port 1a is provided in a ring shape with the fluid discharge port 4a as a center, it is possible to evenly output sounds having the same phase from the periphery of the fluid discharge port 4a.

(Modification)
(1) FIG. 9 is a cross-sectional view of the fluid discharge unit 500 of the first modification. In the following, modification 1 will be described only with respect to differences from the above-described embodiment, and description of the same points will be omitted. The fluid discharge unit 500 of Modification 1 includes a fluid discharge unit main body 200 and a cover member 600. The cover member 600 includes a cylindrical portion 601 that covers the outer peripheral side of the fluid discharge unit main body 200, and a bottom portion 602 that closes an end portion on the back side of the cylindrical portion 601. The bottom portion 602 includes an annular flat surface portion 603 and a circular convex portion 504, and covers the back side of the fluid discharge unit main body 200.

  The cover member 600 of the first modification includes an inner peripheral surface that forms a gap G between the cover member 600 and the outer peripheral surface of the fluid discharge unit main body 200. The inner peripheral surface of the cover member 600 includes a cylindrical surface 607 extending in the Z direction and an inclined surface 606 that is inclined with respect to the cylindrical surface 607. The inclined surface 606 is provided at a corner where the tubular portion 601 and the annular flat portion 603 are connected. The inclined surface 606 is inclined 45 degrees with respect to the Z direction. The inclination angle of the inclined surface 606 is not limited to 45 degrees and can be changed as appropriate. The inclined surface 606 is a tapered surface having a diameter that increases toward the opening end 601a of the cylindrical portion 601, and the sound emitting port 1a provided between the opening end 601a of the cylindrical portion 601 and the fluid discharge unit main body 200. Facing the side. The inclined surface 606 is disposed on the outer peripheral side of the frame 75, and the opening 75 e formed in the frame 75 is disposed on the inner peripheral side of the inclined surface 606. Therefore, the inclined surface 606 faces the opening 75e side.

  In the first modification, the sound emitted from the opening 75e to the outer peripheral side is reflected by the inclined surface 606 and travels along the inner peripheral surface of the cylindrical portion 601 toward the sound emitting port 1a (second sound transmission path S2). ) In the first modification, the sound is easily transmitted in the direction toward the sound emission port 1a due to the reflection of the sound on the inclined surface 606, so that a good sound can be produced. In addition, the inner peripheral surface of the corner portion where the cylindrical portion 601 and the annular flat surface portion 603 are connected may be the inclined surface 606 over the entire circumference, or only a part in the circumferential direction may be the inclined surface 606. For example, the inclined surface 606 may be provided only in a portion facing the opening 75e formed in the frame 75.

(2) FIG. 10 is a partial cross-sectional view of the shutter mechanism 300 of the second modification. As shown in FIG. 10, in Modification 2, elastic members 700 are provided between the slide member 310 and the end plate portion 42 and between the slide member 310 and the protection plate 320. In the second modification, thin elastic members 700 are attached to both surfaces of the closing portion 313 of the shutter member 310. The elastic member is, for example, a foamed or porous member such as a flexible polyurethane foam. By attaching such an elastic member 700, rattling of the slide member 310 due to vibration can be suppressed, and vibration noise can be suppressed. For example, when the shutter mechanism 300 is closed and a sound is produced, it is possible to prevent the slide member 310 from resonating and rattling. In addition, since at least one of the gap between the slide member 310 and the end plate portion 42 and the gap between the slide member 310 and the protection plate 320 can be closed by the elastic member 700, there is less risk of fluid or sound leaking from the gap. can do.

The elastic member 700 may be attached to only one surface instead of the both surfaces of the closing portion 313. Further, the elastic member 700 may be attached not only to the closing portion 313 but also to the annular portion 315. If the elastic member 700 is attached to the annular portion 315, there is little possibility that the fluid leaks from the gap when the fluid is discharged. Alternatively, the elastic member 700 may be attached to the surface of the end plate portion 42 facing the slide member 310 and the surface of the protection plate 320 facing the slide member 310. For example, the elastic member 700 may be attached to the annular convex portion 426. Alternatively, the annular convex portion 426 may be omitted, and the annular elastic member 700 may be attached to the edge of the fluid discharge port 4a.

(3) In the above embodiment, a net-like protective member may be provided inside the pressurizing chamber 3. By disposing the protective member at a position facing the fluid discharge port 4a, it is possible to prevent foreign matter from entering the pressurizing chamber 3 from the fluid discharge port 4a when the shutter mechanism 30 is in the open state. Moreover, by using a net-like protective member, it is possible to prevent foreign matter from entering without weakening the momentum of the fluid. Similarly, a net-like protective member may be provided in the gap G formed between the inner peripheral surface of the cover member 100 and the outer peripheral surface of the fluid discharge unit main body 200. Alternatively, a net-like protective member may be attached so as to cover the sound emission port 1a from the front side (+ Z direction). If it does in this way, it can prevent that a foreign material penetrate | invades into the clearance gap G from the sound discharge port 1a. In addition, if a net-like protective member is used, a good sound can be produced because there is little risk of sound being trapped by the protective member.

  DESCRIPTION OF SYMBOLS 1 ... Fluid discharge unit, 1a ... Sound discharge port, 2 ... Movable plate, 3 ... Pressurization chamber, 4 ... Pressurization chamber formation member, 4a ... Fluid discharge port, 5 ... Movable plate drive mechanism, 6 ... Movable body, 7 DESCRIPTION OF SYMBOLS ... Fixed body, 7a ... Inner space, 8 ... Support member, 8a ... Movable side fixing part, 8b ... Fixed side fixing part, 8c ... Folding part, 9 ... Damper member, 9a ... Movable body side fixing part, 9b ... Fixed body side fixing 9c ... Spring part 41 ... Cylindrical part 42 ... End plate part 43 ... Overhang part 44 ... Recessed part 45 ... Bracket 61 ... Bobbin 62 ... Drive coil 71 ... Drive magnet 72 ... Shaft, 72a ... fixed part, 73, 74 ... fixing plate, 73a, 74a ... through hole, 75 ... frame, 75a ... bottom part, 75b ... expanded diameter part, 75c ... collar part, 75d ... cylinder part, 75e ... opening part , 75f: support column, 100: cover member, 101: cylindrical portion, 101a: opening , 102 ... bottom part, 103 ... annular flat part, 104 ... circular convex part, 105 ... boss part, 106 ... fixing screw, 110 ... shutter mechanism housing part, 111, 112 ... side plate part, 113 ... connecting plate part, 114 ... bottom plate 115, fixing screw, 200 ... fluid discharge unit main body, 300 ... shutter mechanism, 310 ... slide member, 311 ... shutter plate, 311A ... closed position, 311B ... open position, 312 ... connection part, 313 ... closing part, 314 ... circular opening, 315 ... annular part, 316 ... arm part, 320 ... protective plate, 321 ... circular plate part, 322 ... arm part, 323 ... circular opening, 324 ... annular convex part, 325 ... rectangular opening, 326 ... guide rib, 330 ... Shutter drive mechanism, 331 ... solenoid, 332 ... movable iron core, 333 ... movable member, 334 ... cam barrel, 335 ... rotary shaft, 336 ... cam pin, 37 ... Cam groove, 338 ... Cam mechanism, 339 ... Support frame, 340 ... LED unit, 350 ... Fixing screw, 421 ... Boss part, 422 ... Circular rib, 423 ... Linear rib, 424 ... Arc-shaped rib, 425 ... Guide rib 426 ... annular projection, 500 ... fluid discharge unit, 600 ... cover member, 601 ... cylindrical portion, 601a ... open end, 602 ... bottom, 603 ... annular flat portion, 604 ... circular projection, 606 ... inclined surface, 607 ... cylindrical surface, 700 ... elastic member, G ... gap, L ... rotation axis, R ... rotation axis, S1 ... first sound transmission path, S2 ... second sound transmission path

Claims (7)

A fluid discharge unit for moving a movable plate to discharge a fluid in a pressurized chamber from a fluid discharge port;
A pressurizing chamber forming member in which the fluid discharge port is formed and partitions the pressurizing chamber together with the movable plate;
A movable body that linearly moves the movable plate, and a movable plate drive mechanism that includes a fixed body that movably holds the movable body;
A cover member covering an outer peripheral side of the fixed body and the pressurizing chamber forming member,
A gap communicating with the outside is provided between the cover member and the pressurizing chamber forming member and the fixed body,
A fluid discharge unit, wherein a space opposite to the side where the pressurizing chamber is located with respect to the movable plate communicates with the gap through an opening provided in the fixed body.   The fluid discharge unit according to claim 1, further comprising a shutter mechanism that opens and closes the fluid discharge port. The pressurizing chamber forming member includes an end plate portion in which the fluid discharge port is formed,
The shutter mechanism is
A protective plate disposed on the opposite side of the pressurizing chamber with respect to the end plate portion;
A slide member slidably disposed between the end plate portion and the protection plate;
The fluid discharge unit according to claim 2, further comprising a shutter drive mechanism that drives the slide member.   The fluid discharge unit according to claim 3, wherein an elastic member is disposed between at least one of the slide member and the end plate portion and between the slide member and the protective plate. The shutter drive mechanism includes a solenoid, and a cam mechanism that converts a linear motion of the movable iron core of the solenoid into a rotational motion of a rotating member,
5. The fluid discharge unit according to claim 3, wherein the slide member moves to a closed position for closing the fluid discharge port and an open position for opening the fluid discharge port based on the rotation of the rotating member. . The cover member includes an inner peripheral surface that forms the gap with an outer peripheral surface of the pressurizing chamber forming member,
The inner peripheral surface includes a cylindrical surface and an inclined surface inclined with respect to the cylindrical surface,
The fluid discharge unit according to any one of claims 1 to 5, wherein the opening is disposed on an inner peripheral side of the inclined surface. The cover member includes a cylindrical portion whose one end is open, and a bottom portion that closes the other end of the cylindrical portion,
The pressurizing chamber forming member is disposed on the inner peripheral side of the cylindrical portion with the fluid discharge port facing the same side as the opening end of the cylindrical portion, and the movable plate driving mechanism is configured to form the pressurizing chamber. Between the member and the bottom,
A sound discharge port is formed between the opening end of the cylindrical portion and the outer peripheral surface of the pressurizing chamber forming member, and the gap communicates with the outside through the sound discharge port. Item 6. The fluid discharge unit according to any one of Items 1 to 5.

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