WO2011052521A1 - Dispositif haut-parleur - Google Patents

Dispositif haut-parleur Download PDF

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Publication number
WO2011052521A1
WO2011052521A1 PCT/JP2010/068811 JP2010068811W WO2011052521A1 WO 2011052521 A1 WO2011052521 A1 WO 2011052521A1 JP 2010068811 W JP2010068811 W JP 2010068811W WO 2011052521 A1 WO2011052521 A1 WO 2011052521A1
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WO
WIPO (PCT)
Prior art keywords
speaker device
piezoelectric film
film
diaphragm
film diaphragm
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Application number
PCT/JP2010/068811
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English (en)
Japanese (ja)
Inventor
良雄 坂本
Original Assignee
Ｊ＆Ｋカーエレクトロニクス株式会社
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Application filed by Ｊ＆Ｋカーエレクトロニクス株式会社 filed Critical Ｊ＆Ｋカーエレクトロニクス株式会社
Publication of WO2011052521A1 publication Critical patent/WO2011052521A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • the present invention relates to a speaker device.
  • Patent Document 1 discloses a speaker device in which electrodes are formed on both sides of a flexible piezoelectric film serving as a diaphragm, and the back side of the piezoelectric film is supported by an elastic support. Further, in Patent Document 2, a through hole is provided in the center of the metal plate, and a piezoelectric element is attached to either or both of the front surface and the back surface of the metal plate so as to be balanced as the center of the through hole. A speaker device is disclosed.
  • the speaker device that employs a piezoelectric film as a diaphragm disclosed in Patent Document 1 and Patent Document 2 described above is excellent in reproduction capability in the mid-high range, but is insufficient as reproduction capability in the low range. is doing.
  • These speaker devices have a back-open configuration without a back cavity. Therefore, there is a cancellation phenomenon in which the sound radiated from the front side of the piezoelectric film goes around to the back side of the piezoelectric film and cancels out with the sound radiated to the back side that is in the opposite phase to the sound on the front side. appear.
  • the sound that wraps around the back side of the piezoelectric film and the sound radiated to the back side may resonate, and in that case, the sound pressure increases rapidly, and so-called peaky sound is generated. There is also a problem.
  • the cancellation phenomenon described above since the back of the piezoelectric film tends to occur on the low frequency band side where the frequency is low, the reproduction capability of the speaker device in the low frequency band is further reduced. Further, the cancellation phenomenon may cause a peak and a dip in the reproduction frequency band in relation to the phase characteristic, and in this case, there is a problem that the reproduction ability is impaired without becoming a flat characteristic.
  • the piezoelectric film is formed in a cylindrical shape, one end of the cylinder is closed with a disk-shaped top plate, an acoustic cavity is formed by the piezoelectric film itself, and the other end of the cylindrical shape
  • the piezoelectric film formed in a cylindrical shape is assumed to form a cavity by the piezoelectric film itself, it is easily deformed only by applying an external force to the piezoelectric film.
  • an external force is applied by a finger or the like, if the piezoelectric film exceeds the limit that can be restored to its original shape, the cavity formed by the piezoelectric film remains in a dent state.
  • an object of the present invention is to provide a speaker device in which a dent is hardly generated even when an external force is applied to the piezoelectric film.
  • a first side surface of the speaker device of the present invention is formed by curving while using a film as a base material, and a film diaphragm for vibrating the film to generate sound.
  • a support mechanism for supporting the film diaphragm, and the support mechanism is provided with a structure, and the structure is pushed by a finger against one surface side of the film diaphragm. These are opposed to each other with an interval such that the deformation caused by the pressing by the external force is elastically restored.
  • the film diaphragm is formed as a base material and has a piezoelectric film having a piezoelectric effect, and a conductive polymer is coated on both front and back surfaces of the piezoelectric film. It is preferable to have a polymer coat portion formed in this manner and an electrode that is attached in a state of being electrically connected to the polymer coat portion and that inputs an electric signal for vibrating the piezoelectric film.
  • the speaker unit is attached to a portion different from the portion where the film diaphragm is attached in the longitudinal direction of the support mechanism. .
  • the film diaphragm is disposed in a cylindrical shape, and the support mechanism is provided on one side in the longitudinal direction of the structure.
  • the cup body to which the speaker unit is attached while being connected to the structure, and the inner peripheral side of the film diaphragm which is provided on the other side in the longitudinal direction of the structure and connected to the structure and has a circumferential shape It is preferable to have an acoustic duct capable of emitting the sound or pressure fluctuation generated in step 1 to the outside, and a columnar column that connects the cup body and the acoustic duct and is disposed inside the piezoelectric film diaphragm.
  • the structure preferably has a hollow portion and functions as an acoustic cavity for guiding sound transmission.
  • the structure preferably includes a through hole communicating with the hollow portion from the outer peripheral side.
  • a cushioning material having elasticity that can be restored against the addition of external force is disposed between the film diaphragm and the structure. It is preferable that this cushion material is arrange
  • the structure is preferably a cylindrical pipe member.
  • the present invention can provide a speaker device in which a dent hardly occurs even when an external force is applied to the piezoelectric film.
  • FIG. 1 is a perspective view of a speaker device according to an embodiment of the present invention. It is a disassembled perspective view of the speaker apparatus which concerns on one embodiment of this invention. It is side sectional drawing of the speaker apparatus which concerns on one embodiment of this invention. It is a top view which shows the structure of the piezoelectric film diaphragm in the speaker apparatus of FIG. It is a top view which expands and shows the peripheral edge part of the piezoelectric film diaphragm of FIG.
  • FIG. 1 to FIG. 3 the side where the acoustic duct 53 is present is defined as “upper”, and the side where the speaker unit 30 is present is defined as “lower”.
  • FIG. 1 and 2 are perspective views of a speaker device 10 according to an embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the speaker device 10 according to the embodiment of the present invention.
  • FIG. 3 is a side sectional view of the speaker device 10 according to one embodiment of the present invention.
  • the speaker device 10 includes a piezoelectric film diaphragm 20 and a speaker unit 30, and further includes a support mechanism 50 that supports the piezoelectric film diaphragm 20 and the speaker unit 30. I have.
  • the piezoelectric film diaphragm 20 corresponds to an example of the film diaphragm in the claims.
  • the piezoelectric film 21 has a rectangular shape with a width of 210 mm, a height of 297 mm, and a thickness of 80 ⁇ m (as an example of the film in the claims). Corresponding) is rounded into a cylindrical shape.
  • Vinylidene fluoride resin (PVDF) can be used as the base material of the piezoelectric film 21, and a conductive polymer is coated on both front and back surfaces (hereinafter, the portion coated with the conductive polymer is polymer coated).
  • the polymer coat portion 22 is formed on the entire surface except for about 10 mm from the peripheral end portion of the piezoelectric film 21.
  • a silver paste is coated on the peripheral edge of the above-described piezoelectric film 21 by a technique such as pattern coating (hereinafter referred to as a silver paste coating part 23).
  • a technique such as pattern coating
  • an input terminal 24 electrode for signal input to the piezoelectric film 21 is formed.
  • FIG. 5 shows details of the peripheral edge of the piezoelectric film 21.
  • the polymer coat portion 22 is formed so as to be, for example, 3 mm larger than the piezoelectric film 21 along the width direction (X direction) in FIG. 5.
  • the silver paste coat part 23 has a coat side part 23a and a tongue piece convex part 23b.
  • the coat side portion 23a is formed from the outer peripheral edge portion of the polymer coat portion 22 toward the center in the width direction of the piezoelectric film 21 by, for example, about 3 mm. That is, the width dimension of the coat side 23a is, for example, about 3 mm, and is provided in a frame shape as can be seen from FIG.
  • court side part 23a is formed in 6 mm square, for example.
  • the coat side 23a is formed at a pitch of 14 mm, for example. Therefore, on each of the front surface and the back surface of the piezoelectric film 21, a portion sandwiched between the tongue piece convex portions 23 b is a portion where the silver paste is not applied (concave portion 23 c).
  • the front / back relationship is reversed at the end located on the other end side of the hand (for example, the right end in FIG. 4). That is, in FIG. 4, the Nth tongue piece convex portion 23b is counted along the length from the short side on the upper side (the side where the input terminal 24 is present) or the lower side of the piezoelectric film 21.
  • the end located on the one end side is formed on the front side, and the end located along the length and on the other end side on the short side may be formed on the back side, or on the one end side and the other end side.
  • the front and back may be reversed.
  • Such an inversion relationship between the front and back is such that the end located along the short side and one end of the long side (for example, the upper end in FIG. 4) and the end located along the short side and the other end of the long side (For example, the lower end of FIG. 4). Further, such a reverse relationship may not exist.
  • a 16-micron PET protective film (a 15-micron base material with a 1-micron adhesive and a total thickness of two front and back sheets of about 30 microns; Due to the variation in the thickness of the material, the dimensions are slightly changed).
  • the total thickness of the above-described piezoelectric film 21 is about 100 to 110 microns, for example.
  • the input terminal 24 is attached to the short side of the coat side 23a so as to be electrically connected.
  • the input terminal 24 is provided with a pair (two in total) so as to reach the tongue piece convex portion 23b disposed along the direction (X direction) along the short side of the coat side portion 23a.
  • the respective input terminals 24 are electrically connected to the tongue piece convex portions 23b on which the respective input terminals 24 are approaching.
  • one input terminal 24 is electrically connected to the tongue piece convex portion 23b facing the front surface side (formed on the front surface side of the piezoelectric film 21), and The other input terminal 24 is electrically connected to the tongue piece convex portion 23b facing the back side (formed on the back side of the piezoelectric film 21).
  • the PET protective film is peeled off, and the input terminal 24 and the silver paste coat portion 23 are in an electrically conductive state.
  • the input terminal 24 is not limited to being attached to the tongue piece convex portion 23b located on the short side of the coat side portion 23a.
  • the input terminal 24 is input to the tongue piece convex portion 23b located on the long side of the coat side portion 23a.
  • a terminal lug that is a constituent element of the terminal 24 may be attached by a technique such as caulking.
  • one input terminal 24 is electrically connected to the tongue piece convex portion 23b on the front surface side
  • the other input terminal 24 is electrically connected to the tongue piece convex portion 23b on the back surface side. To do.
  • the crimped portion of the terminal lug can penetrate the PET protective film, and the crimped portion of the terminal lug can be reliably brought into contact with the tongue piece convex portion 23b. Further, as shown in FIG. 5, there is a blank portion where neither the front surface tongue piece convex portion 23b nor the back surface side tongue piece convex portion 23b is applied. Therefore, even if the caulking portion of the terminal lug penetrates the PET protective film, it is electrically connected to the silver paste coat portion 23 on either the front surface side or the back surface side, and the silver paste coat on both the front surface side and the back surface side. It is not connected to the unit 23 at the same time, and a short circuit can be prevented.
  • the piezoelectric film diaphragm 20 as described above is attached so as to cover the outside of a pipe member 54 described later. At this time, the piezoelectric film diaphragm 20 is fixed to the support mechanism 50 in a substantially cylindrical form having a diameter of about 68 mm and a length of 269 mm, for example. As a result, in the space between the pipe member 54 and the piezoelectric film diaphragm 20, an acoustic cavity 26 having a substantially ring shape as viewed from above is formed (see FIG. 3).
  • the speaker unit 30 is a moving coil type speaker, and constitutes a cone-shaped diaphragm 31, a voice coil 32 constituting a part of a driving body attached to the center of the diaphragm 31, and a part of the driving body. It mainly has a magnetic circuit 33.
  • the diameter of the outer edge portion of the diaphragm 31 is, for example, about 46 mm, and a suspension 34 (also referred to as a free edge) is provided on the outside thereof.
  • the diameter of the suspension 34 is about 50 mm, for example.
  • the diameter of the voice coil 32 is, for example, about 19.5 mm, and, for example, an 8 ⁇ specification is adopted.
  • the voice coil 32 is attached to a substantially cylindrical voice coil bobbin 35.
  • the magnetic circuit 33 is composed of a yoke 36 and a magnet 37 serving as magnetism generating means.
  • the yoke 36 includes a bottom yoke 36a and a holding yoke 36b.
  • the bottom yoke 36a is formed so that a cylindrical columnar portion 36d protrudes downward in FIG. 3 from the center of the bottomed disk-shaped disk portion.
  • an M4 screw hole 36e is provided so as to penetrate the bottom yoke 36a.
  • the ring-shaped magnet 37 is inserted into the cylindrical portion 36d, and the magnet 37 is locked to the bottom yoke 36a by inserting the holding yoke 36b into the cylindrical portion 36d of the bottom yoke 36a from below.
  • the voice coil 32 is disposed in a gap formed between the inner peripheral surface of the holding yoke 36b and the outer peripheral surface of the cylindrical portion 36d.
  • the magnet 37 the outer diameter and the inner diameter are, for example, 50 mm and 22 mm, respectively, and the magnet 37 has a thickness of, for example, 8 mm. Further, in the present embodiment, since parts such as a dust cap and a chamber are not mounted, the vicinity of the tip of the cylindrical portion 36d is exposed to a part inside the voice coil bobbin 35.
  • an iron frame 38 is attached to the outside of the voice coil bobbin 35.
  • the frame 38 has a flange portion 38a, and its maximum external dimension is, for example, 82 mm.
  • the flange portion 38a is provided with holes 38c at positions having a distance of, for example, 72 mm from the center of the frame 38 so as to correspond to the screw holes 51c of the lower cup 51, but there are a total of four holes 38c. It is provided, and the interval between the holes 38c is 90 degrees in the circumferential direction.
  • the diameter of the hole 38c is, for example, 4.5 mm.
  • the speaker unit 30 is disposed inside the opening of the lower cup 51 so that the flange portion 38a contacts the lower edge of the lower cup 51, and, for example, an M4 screw 39 is screwed into the hole 38c and the screw hole 51c. As a result, the speaker unit 30 is fixed in the lower cup 51.
  • a reflective foot 40 is attached below the speaker unit 30.
  • the reflection foot 40 plays a role of reflecting the sound radiated from the speaker unit 30 by the substantially conical inclined surface 40e and diffusing in all angular directions.
  • the reflection foot 40 is not an essential configuration, and may be configured such that the reflection foot 40 is not attached to the speaker unit 30.
  • the reflection foot 40 has a substantially triangular pyramid-shaped conical portion 40a and a substantially columnar columnar portion 40b that protrudes upward from the top.
  • a hollow portion 40c hollowed out in a substantially triangular pyramid shape is formed on the back side of the conical portion 40a, and a circular hole 40d is formed so as to penetrate the columnar portion 40b upward from the hollow portion 40c. .
  • the reflection foot 40 has a columnar portion 40b inserted into the voice coil bobbin 35, and from the back side of the reflection foot 40, for example, an M4 screw 41 is screwed into a circular hole 40d and an M4 screw hole 36e of the bottom yoke 36a.
  • the maximum outer diameter of the cone portion 40a and the height dimension of the cone portion 40a are, for example, 86 mm and 20 mm, respectively.
  • the diameter and height of the columnar part 40b are set to 17 mm and 22 mm, for example.
  • the diameter of the circular hole 40d is 4.2 mm.
  • the curvature radius in the cross section of the inclined surface 40e of the cone-shaped part 40a shown in FIG. 3 is about 39 mm, for example.
  • This reflective foot 40 is formed by cutting aluminum. Further, the reflective foot 40 is subjected to black alumite treatment similarly to the lower cup 51 and the acoustic duct 53 described later. However, the material of the reflective foot 40 may be variously changed according to the purpose such as sound quality, and examples thereof include resin and wood.
  • the support mechanism 50 includes a lower cup 51, a center bar 52, an acoustic duct 53, a pipe member 54, and a cushion material 55.
  • the reflective foot 40 described above may be included in the components of the support mechanism 50.
  • the reflective foot 40 may not be included in the constituent elements of the speaker unit 30 or may be included in the constituent elements of the speaker unit 30.
  • the lower cup 51 has a cup shape having an opening 51a (see FIG. 3) that opens downward.
  • the cross-sectional shape of the lower cup 51 has a substantially trapezoidal shape.
  • the height of the substantially trapezoidal shape, the diameter of the lower end portion, and the diameter of the upper end portion are, for example, 50 mm, 84 mm, and 67 mm, respectively.
  • the opening 51a has, for example, a cylindrical hole shape with a diameter of 58.2 mm and a height of 46 mm, and is formed on the lower side of the lower cup 51 by punching.
  • a total of four screw holes 51c are formed in the lower peripheral portion 51b of the lower cup 51 every 90 degrees in the circumferential direction.
  • the speaker unit 30 is fixed to the lower cup 51 by screwing the screw 39 that has passed through the hole 38c of the speaker unit 30 into the screw hole 51c.
  • a semicircular hole 51f, 51f having a pair of semicircular shapes that are symmetrical on the left and right is formed in the upper end portion of the lower cup 51.
  • the semicircular holes 51f and 51f are formed, for example, with an interval of a width of 16 mm.
  • the radius of the semicircular hole 51f is 29 mm.
  • the lower cup 51 has a configuration having a central frame portion 51d that bridges the center of the upper end portion thereof.
  • the width dimension of the central frame portion 51d is, for example, 16 mm.
  • the central frame portion 51d is provided with three countersinks 51e that can be screwed into the screw 60 from below (see FIGS. 2 and 3).
  • aluminum is employed as the material of the lower cup 51, and the surface thereof is subjected to black alumite treatment.
  • the material of the lower cup 51 is not limited to aluminum.
  • a step 51g for positioning the lower end of the pipe member 54 is provided at the upper end of the lower cup 51.
  • the stepped portion 51 g is formed by forming a radially outer portion of the upper end portion of the lower cup 51 lower than a radially inner portion thereof. ing.
  • the pipe member 54 is positioned by the lower end surface of the pipe member 54 and the inner peripheral edge on the lower end side coming into contact with the stepped portion 51g.
  • a center bar 52 is connected to the lower cup 51.
  • the center bar 52 corresponds to an example of a support column in the claims, and has, for example, a cylindrical shape with a diameter of 10 mm and a length of 190 mm.
  • On the lower end surface of the center bar 52 for example, a screw hole 52a having a diameter of 4 mm is formed to a depth of 8 mm.
  • the lower cup 51 and the center bar 52 are fixed to each other by screwing the screw 60 having passed through the countersunk hole 51e of the lower cup 51 into the screw hole 52a.
  • aluminum is adopted as the material of the center bar 52.
  • the material of the center bar 52 is not limited to aluminum.
  • a screw portion 52 b is formed on the upper end side of the center rod 52.
  • the screw portion 52b is formed on the outer peripheral surface on the upper end side of the center bar 52 so as to have a length of, for example, 10 mm, and is formed in a size (for example, M10) corresponding to the diameter of the center bar 52.
  • This screw part 52b is for fixing the acoustic duct 53 mentioned later.
  • the acoustic duct 53 is a portion disposed above the speaker device 10.
  • the acoustic duct 53 has a flange portion 53a and a duct portion 53b.
  • the flange portion 53a is provided with a communication hole 53c that communicates with the hollow portion of the duct portion 53b in the central portion in the radial direction.
  • the diameter of the outer periphery of the flange portion 53a is, for example, 69 mm
  • the inner diameter (diameter) of the communication hole 53c is, for example, 24 mm, similarly to the inner diameter (diameter) of the flange portion 53a.
  • the thickness dimension of the flange part 53a is formed in about 17 mm, for example.
  • the upper surface side of the flange portion 53a is subjected to curved surface processing, and the radius in the sectional view of FIG. 3 is about 11 mm, for example.
  • a step portion 53a1 for positioning the upper end of the pipe member 54 is provided on the outer peripheral side of the flange portion 53a.
  • the stepped portion 53 a 1 is formed such that the outer peripheral portion in the radial direction of the lower end portion of the flange portion 53 a is recessed toward the upper end side from the inner peripheral portion. Is formed.
  • the pipe member 54 is positioned by the upper end surface of the pipe member 54 and the inner peripheral edge on the upper end side coming into contact with the stepped portion 53a1.
  • the duct portion 53b is provided in a cylindrical shape having a bottom (having a bottom portion 53d).
  • the cylindrical portion has, for example, a thickness of 3 mm, an inner diameter (diameter) of 24 mm, and a length dimension of about 125 mm.
  • the thickness of the bottom 53d is, for example, 12 mm, and the bottom 53d is provided with, for example, an M10 screw hole 53e.
  • the screw portion 52b of the center bar 52 is screwed into the screw hole 53e. Further, as shown in FIG. 3, for example, C2 chamfering is performed on the outer peripheral side and the lower side of the screw hole 53e. Therefore, it becomes easy to guide the screw portion 52b of the center bar 52 into the screw hole 53e, and the work of screwing the screw portion 53b into the screw hole 53e becomes easy.
  • a notch 53f is formed on the lower side and the outer peripheral surface of the duct 53b.
  • the notch 53f is formed so that the lower end side thereof is substantially flush with the upper surface of the bottom 53d.
  • a total of two notches 53f are provided at intervals of 180 degrees.
  • Each notch 53f has, for example, a height dimension of 30 mm and a depth dimension (assuming a plane that contacts a certain part of the outer periphery of the duct part 53f, the plane extends from the contact part to the center side in the radial direction.
  • the movement distance when moved in the direction is 8 mm. Therefore, in the acoustic duct 53, the notch 53f becomes an acoustic opening, and therefore the acoustic duct length of the duct portion 53b is substantially 95 mm.
  • aluminum is adopted as the material of the acoustic duct 53, and the surface thereof is subjected to black alumite treatment.
  • the material of the acoustic duct 53 is not limited to aluminum.
  • the pipe member 54 corresponds to an example of a structure in the claims.
  • the pipe member 54 is a cylindrical member that is open at both ends.
  • the length dimension is 297 mm
  • the outer diameter is 64 mm
  • the thickness dimension (thickness) of the pipe member 54 is 2.5 mm.
  • the pipe member 54 is made of a resin such as an acrylic resin, but the material is not limited to the resin, and a material other than a resin such as metal or wood is used to obtain a preferable sound.
  • a resin such as an acrylic resin, but the material is not limited to the resin, and a material other than a resin such as metal or wood is used to obtain a preferable sound.
  • a plurality of through holes 54 a are provided in a portion near the center in the longitudinal direction of the pipe member 54.
  • a total of eight through holes 54 a are provided along the circumferential direction of the pipe member 54, for example, at intervals of 45 degrees.
  • a total of three through holes 54 a are provided along the longitudinal direction of the pipe member 54, for example, with a space of 30 mm therebetween. That is, the pipe member 54 is provided with a total of 24 through holes 54a.
  • the center position of the through hole 54 a located at the center of the total three through holes 54 coincides with the pipe member 54.
  • the above-mentioned through-hole 54a is provided for adjusting the sound quality, sound pressure, etc. of the sound emitted to the outside after being generated in the piezoelectric film diaphragm 20. Therefore, the number and size of the through holes 54a can be variously changed, and a configuration in which the through holes 54a are not provided may be employed.
  • a cushion material 55 is provided to attach the piezoelectric film diaphragm 20 to the pipe member 54.
  • the cushion material 54 is made of, for example, independent foamed urethane, and an adhesive tape is attached to either the front surface or the back surface.
  • the cushion material 55 includes a cushion material 55 a that is attached in a ring shape to the upper end side and the lower end side of the pipe member 54.
  • the thickness dimension is 2 mm
  • the width dimension is 10 mm
  • the length dimension is 210 mm.
  • the cushion material 55 includes a linear cushion material 55b that connects two ring-shaped cushion materials 55a.
  • the thickness dimension and the width dimension are the same as those of the cushion material 55a, and the length dimension is 276 mm.
  • the screw portion 52b of the center rod 52 is screwed into the screw hole 53e of the acoustic duct 53, and both are fixed. Subsequently, the lower end portion and the inner peripheral edge of the pipe member 54 are positioned at the stepped portion 51 g of the lower cup 51, and the upper end portion and the inner peripheral edge of the pipe member 54 are positioned at the stepped portion 53 a 1 of the acoustic duct 53. At this time, the countersink 51e of the lower cup 51 and the screw hole 52a of the center bar 52 are in communication.
  • the ring-shaped cushion material 55a is attached to the upper end side and the lower end side of the pipe member 54, and the linear cushion material 55b is connected to the pipe member 54 so as to connect the ring-shaped cushion material 55b.
  • the cushion material 55b is assumed to be positioned at the connecting portion.
  • the cushion members 55a and 55b may be attached before the pipe member 54 is attached to the acoustic duct 53 and the lower cup 51.
  • the cushioning materials 55a and 55b may be attached at any timing as long as the piezoelectric film diaphragm 20 is not attached.
  • the speaker unit 30 is attached and fixed to the lower cup 51.
  • the flange portion 38a of the speaker unit 30 is brought into contact with the lower edge portion of the lower cup 51.
  • the hole 38c of the flange portion 38a and the screw hole 51c of the lower cup 51 are aligned.
  • the screw 39 is screwed into the hole 38c and the screw hole 51c.
  • the speaker unit 30 is fixed in the lower cup 51.
  • the columnar portion 40 b of the reflective foot 40 is inserted into the voice coil bobbin 35.
  • the circular hole 40d of the reflective leg 40 and the screw hole 36e of the bottom yoke 36a are aligned.
  • the screw 41 is screwed into the circular hole 40d and the screw hole 36e from below the reflective foot 40.
  • the reflection foot 40 is attached and fixed to the speaker unit 30 or the like.
  • the speaker device 10 is assembled as described above.
  • the piezoelectric film 21 is deformed into a cylindrical shape to form the piezoelectric film diaphragm 20, and further, for example, a clearance of 2 mm is provided inside the piezoelectric film 21, so that a pipe member is provided. 54, the inside of the pipe member 54 becomes the back cavity of the speaker unit 30, and the front side of the pipe member 54 constitutes the back cavity of the piezoelectric film 21.
  • the piezoelectric film diaphragm 20 when the surface of the piezoelectric film diaphragm 20 is pushed in with a finger or the like, the piezoelectric film diaphragm 20 is deformed so as to be recessed, but the pipe member 54 that is a shielding object is placed at a narrow interval of, for example, 2 mm. There is a side. Therefore, the portion of the piezoelectric film diaphragm 20 that has been pushed in hits the outer peripheral surface of the pipe member 54 and is not pushed any further, so that deformation of the piezoelectric film diaphragm 20 can be prevented.
  • the function of preventing such deformation is to achieve the protection function of the piezoelectric film diaphragm 20 without disposing a film deformation prevention protector such as a wire mesh on the outer peripheral side of the piezoelectric film diaphragm 20. Is possible. For this reason, since the sound emitted from the surface of the piezoelectric film diaphragm 20 is not blocked by the protector positioned on the outer peripheral side, the protector is compared with the one positioned on the outer peripheral side of the piezoelectric film diaphragm 20, The sound quality can be improved, and a good sound field can be formed.
  • a pipe member 54 formed in a cylindrical shape is disposed on the inner peripheral surface side of the piezoelectric film diaphragm 20.
  • the pipe member 54 prevents the sound from being transmitted to the inside of the pipe member 54.
  • the pipe member 54 constitutes an acoustic cavity of the speaker unit 30. Accordingly, the piezoelectric film diaphragm 20 and the speaker unit 30 have the advantage that the two speakers can function without interfering with each other.
  • the piezoelectric film diaphragm 20 resonates with back pressure generated by the diaphragm (cone) of the speaker unit 30, resulting in abnormalities. It is possible to prevent the phenomenon of generating a sound (sounding sound). For this reason, in the speaker device 10, it is possible to improve the sound quality, and it is possible to obtain much better sound quality and sound pressure than the conventional hybrid speaker, particularly for reproduction in the low frequency band.
  • cushion materials 55a having a thickness of 2 mm are disposed on the upper end side and the lower end side of the pipe member 54.
  • the cushion material 55b is disposed at a location assumed to be a connecting portion of the piezoelectric film diaphragm 20.
  • an appropriate clearance can be obtained between the piezoelectric film diaphragm 20 and the pipe member 54.
  • the cushioning agent 55 since the cushioning agent 55 has appropriate flexibility, an abnormal sound (generally referred to by the general public) generated by resonance vibration in the attachment portion of the piezoelectric film diaphragm 20 (portion joined to the cushion material 55). It is possible to reduce the noise.
  • the sound quality can be adjusted by setting the above clearance to an appropriate size. That is, it is possible to prevent resonance of the piezoelectric film diaphragm 20 by disposing the cushion material 55 that can be accommodated in an appropriate clearance in the cavity constituted by the piezoelectric film diaphragm 20 and the pipe member 54. For this reason, even when the piezoelectric film diaphragm 20 has a large area, resonance can be easily prevented.
  • the pipe member 54 is provided with a plurality of through holes 54a, it is possible to easily adjust the sound quality.
  • the acoustic duct 53 is disposed above the pipe member 54, and the lower cup 51 is disposed below the pipe member 54. For this reason, the pipe member 54 can be firmly fixed by the acoustic duct 53 and the lower cup 51.
  • the screw hole 53e of the acoustic duct 53 has a configuration in which the screw portion 52b of the center rod 52 is screwed, so that the number of parts is omitted and the mounting man-hour of the pipe member 54 is further reduced. It becomes possible to reduce.
  • the acoustic cavity 26 is configured using the piezoelectric film diaphragm 20, and the piezoelectric film diaphragm 20 and the speaker unit 30 can be supported by the support mechanism 50, and the piezoelectric film diaphragm 20 and the speaker are supported. It is possible to simultaneously generate sound by vibrating the diaphragms 31 provided in the unit 30 to each other. Therefore, it is possible to reproduce sound in a wide sound range that cannot be realized by a conventional speaker device using a piezoelectric film (hereinafter referred to as a piezoelectric film speaker), and the performance of the speaker device 10 can be improved.
  • a piezoelectric film speaker hereinafter referred to as a piezoelectric film speaker
  • the speaker device 10 uses the piezoelectric film diaphragm 20 and the speaker unit 30 in combination, it is possible to reproduce sound in a low frequency range that is difficult to obtain with a conventional piezoelectric film speaker. Therefore, the sound pressure in the reproduction band (low sound range) that is difficult to obtain with the piezoelectric film speaker is supplemented by the speaker unit 30, and sufficient sound pressure can be obtained in the low sound range in addition to the sound pressure in the middle and high sound range. It becomes.
  • the speaker device 10 employs a configuration including the speaker unit 30.
  • the present invention is valid even for a speaker device that does not include the speaker unit 30.
  • the piezoelectric film 21 is formed by making the piezoelectric film 21 cylindrical, but the shape of the piezoelectric film diaphragm 20 can be freely selected according to the purpose. is there.
  • the piezoelectric film diaphragm may be formed by simply bending the piezoelectric film 21 into a semicylindrical shape (so-called bowl shape), and a cavity corresponding to the semicylindrical shape may be manufactured.
  • the piezoelectric film 21 may be formed in a conical shape to form a piezoelectric film diaphragm, and a conical cavity may be disposed and mounted behind the piezoelectric film 21.
  • the piezoelectric film 21 based on vinylidene fluoride resin (PVDF) is used, but a film-like diaphragm made of other materials may be used. Further, a film diaphragm by another driving method may be used without depending on the driving method by the piezoelectric effect.
  • electrodes are attached to both ends of a CNT (carbon nanotube) transparent film having a thickness of several tens of nanometers, and an electrical signal is converted into sound using the thermoacoustic effect (that is, the electrical signal is heated).
  • a film that vibrates and produces sound may be used.
  • the center rod 52 provided with the screw hole 52a and the screw part 52b is arrange
  • screws are provided at both ends of a rod having substantially the same length as the length of the pipe member 54, and a plurality of rods are mounted inside the pipe member 54.
  • the acoustic duct 53 and the pipe member above the pipe member 54 are installed.
  • a configuration may be employed in which the pipe member 54 is clamped by screwing the outer peripheral portion of the lower cup 51 disposed below the 54.
  • the pipe member 54 is provided with a plurality of through holes 54a.
  • the present invention is not limited to such a through hole 54a, and various through holes may be provided according to the purpose.
  • the through hole may be a fine mesh.
  • the material of the pipe member 54 can also be freely selected according to the purpose, such as punching metal.
  • the support mechanism 50 and / or the pipe member 54 as a structure in the above-described embodiment is not limited to an integrally formed one, but a plurality of separately provided ones are assembled. It may be configured.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

L'invention concerne un dispositif haut-parleur dans lequel des renfoncements sont peu susceptibles d'apparaître, même en cas d'application d'une force extérieure sur un film piézoélectrique. Le dispositif haut-parleur (10) comporte : un diaphragme (20) à film formé d'un film (21) en tant que matériau de base et destiné à produire un son par la vibration de ce film (21), et un mécanisme de support (50) qui supporte le diaphragme (20) à film. En outre, une structure (54) est agencée dans le mécanisme de support (50). Cette structure (54) fait face à un côté de surface du diaphragme (20) à film avec lequel est maintenue une distance suffisante afin de rétablir de manière élastique les déformations dues à la poussée d'une force extérieure.
PCT/JP2010/068811 2009-10-28 2010-10-25 Dispositif haut-parleur WO2011052521A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009248303A JP5392006B2 (ja) 2009-10-28 2009-10-28 スピーカ装置
JP2009-248303 2009-10-28

Publications (1)

Publication Number Publication Date
WO2011052521A1 true WO2011052521A1 (fr) 2011-05-05

Family

ID=43921943

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/068811 WO2011052521A1 (fr) 2009-10-28 2010-10-25 Dispositif haut-parleur

Country Status (2)

Country Link
JP (1) JP5392006B2 (fr)
WO (1) WO2011052521A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015149247A1 (fr) * 2014-03-31 2015-10-08 刘骏涛 Lecteur audio miniature portable
EP2958338A1 (fr) * 2014-06-18 2015-12-23 Jetvox Acoustic Corporation Haut-parleur de type piézoélectrique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015127651A1 (fr) * 2014-02-28 2015-09-03 刘骏涛 Électronique audio miniature
WO2015127660A1 (fr) * 2014-02-28 2015-09-03 刘骏涛 Dispositif électronique audio miniature
KR102492521B1 (ko) * 2018-07-10 2023-01-30 삼성전자주식회사 음향 출력 장치
KR200497541Y1 (ko) * 2021-07-26 2023-12-07 동관자성라이팅테크놀리지 코., 엘티디 스피커 딸린 램프

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS55141897A (en) * 1979-04-20 1980-11-06 Matsushita Electric Ind Co Ltd Electroacoustic converter and its manufacture
JPS6142185U (ja) * 1984-08-23 1986-03-18 ソニー株式会社 ヘツドホ−ン
JPS63181099U (fr) * 1987-05-15 1988-11-22
JPS6446399A (en) * 1987-08-14 1989-02-20 Nippon Yakin Kogyo Co Ltd Speaker device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55141897A (en) * 1979-04-20 1980-11-06 Matsushita Electric Ind Co Ltd Electroacoustic converter and its manufacture
JPS6142185U (ja) * 1984-08-23 1986-03-18 ソニー株式会社 ヘツドホ−ン
JPS63181099U (fr) * 1987-05-15 1988-11-22
JPS6446399A (en) * 1987-08-14 1989-02-20 Nippon Yakin Kogyo Co Ltd Speaker device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015149247A1 (fr) * 2014-03-31 2015-10-08 刘骏涛 Lecteur audio miniature portable
EP2958338A1 (fr) * 2014-06-18 2015-12-23 Jetvox Acoustic Corporation Haut-parleur de type piézoélectrique
US9467784B2 (en) 2014-06-18 2016-10-11 Jetvox Acoustic Corp. Piezoelectric-type speaker

Also Published As

Publication number Publication date
JP5392006B2 (ja) 2014-01-22
JP2011097297A (ja) 2011-05-12

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