WO2016110991A1 - Transducteur électroacoustique - Google Patents

Transducteur électroacoustique Download PDF

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Publication number
WO2016110991A1
WO2016110991A1 PCT/JP2015/050432 JP2015050432W WO2016110991A1 WO 2016110991 A1 WO2016110991 A1 WO 2016110991A1 JP 2015050432 W JP2015050432 W JP 2015050432W WO 2016110991 A1 WO2016110991 A1 WO 2016110991A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibrating body
valley
reinforcing
electroacoustic transducer
along
Prior art date
Application number
PCT/JP2015/050432
Other languages
English (en)
Japanese (ja)
Inventor
中嶋　弘
野呂　正夫
宗一 瀧川
卓朗 曽根
憲市 ▲吉▼永
Original Assignee
ヤマハ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ株式会社 filed Critical ヤマハ株式会社
Priority to PCT/JP2015/050432 priority Critical patent/WO2016110991A1/fr
Publication of WO2016110991A1 publication Critical patent/WO2016110991A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil

Definitions

  • the Riffel type speaker has a diaphragm composed of a pair of rectangular curved plates, has good directivity in the mid-high range, and the sound spreads in the lateral direction along the curved direction of the diaphragm, and is almost spread in the vertical direction. It has the characteristic of not.
  • Patent Document 1 a conductor pattern as a voice coil is printed on the center portion of the polymer resin film, and the center portion is folded and bonded to form a plate-like portion having a conductor pattern;
  • a vibration plate is formed integrally with the curved first and second vibration parts, and a flat plate-like portion of the vibration plate is disposed in a magnetic gap in the magnetic circuit, and the tips of both vibration parts Discloses a speaker having a structure fixed to a support member.
  • Patent Document 2 the center portion of the diaphragm is folded back with a concave portion, and a flat voice coil wound in an oval shape is disposed in the concave portion, and the voice coil is separated vertically.
  • a speaker having a structure arranged in two magnetic gaps is disclosed. Also in this speaker, the outer peripheral part of the diaphragm is fixed on an annular frame.
  • Patent Document 3 discloses a speaker having a structure in which a conductor is sandwiched between valleys of a diaphragm having a substantially V-shaped cross section and the conductor is installed in a magnetic field.
  • Patent Document 4 discloses a speaker having a structure in which a bent portion of a bent diaphragm is directly coupled to a piezoelectric element.
  • the present invention has been made in view of such circumstances, and between the vibrating body having a pair of curved vibration surfaces and a conversion unit such as a voice coil motor, over the entire length of the vibrating body.
  • An object is to provide an inexpensive electroacoustic transducer capable of reliably transmitting vibrations.
  • a pair of vertically split cylindrical surfaces are formed in parallel, and a vibrating body in which a trough is formed between one side portions of the adjacent vertically split cylindrical surfaces;
  • a transducer that converts vibration along the depth direction of the valley of the vibrating body and an electrical signal corresponding to the vibration, and the valley of the vibrating body includes the pair of vertically split cylindrical surfaces Are formed through joint portions that are joined to each other, and the joint portion is provided with a reinforcing portion along the extending direction of the valley portion, and the conversion portion is located in the middle of the length direction of the reinforcing portion. It is characterized by being connected to.
  • the drive of the conversion unit can be reliably transmitted over the entire length of the vibrating body, and the electroacoustic transducer of the present invention can be transmitted to a microphone. Also when applied to, the vibration of the vibrating body can be reliably transmitted to the conversion unit.
  • a general-purpose voice coil motor or the like can be applied as the conversion unit and can be manufactured at low cost.
  • the reinforcing portion can be formed by bonding or welding one side portions of the pair of vertically split cylindrical surfaces.
  • a reinforcing tool can be attached to the reinforcing portion along the extending direction of the valley portion. In this case, the rigidity of the reinforcing part can be further improved.
  • the reinforcing portion is integrally provided with a cap capable of fitting a part of the converting portion, and the cap is partially engaged and fixed to the cap. It is good to be.
  • the electroacoustic transducer of the present invention is provided with the reinforcing portion that reinforces the joint portion of the vibrating body along the extending direction of the valley portion, the converting portion connected to the midway position in the length direction of the reinforcing portion. Vibration can be reliably transmitted over the entire length of the vibrating body, and a general-purpose voice coil or the like can be applied as the conversion unit, and can be manufactured at low cost. .
  • FIG. 4 is a half-sectional perspective view of the speaker cut along line AA in FIG. 3.
  • FIG. 4 is a cross-sectional view taken along line AA in FIG. 3.
  • It is a longitudinal cross-sectional view which shows a vibrating body. It is a longitudinal cross-sectional view explaining the other modification of a vibrating body. It is a longitudinal cross-sectional view explaining the further another modification of a vibrating body, (a) is before welding, (b) shows the state after welding.
  • the speaker (electroacoustic transducer) of this embodiment includes a vibrating body 1, an actuator (converting unit) 2 that reciprocates the vibrating body 1, and a support frame 3 that supports the vibrating body 1 and the actuator 2. And an edge portion 4 for supporting the vibrating body 1 on the support frame 3 so as to be reciprocally movable.
  • the vertical direction is set so that the side on which the edge portion 4 is provided is up and the side on which the actuator 2 is provided is down, and the support is formed in a rectangular shape as will be described later.
  • the long side direction of the frame 3 is a vertical direction or a length direction
  • the short side direction is a horizontal direction
  • the upper surface is the front surface
  • the lower surface is the back surface
  • the vertical direction (length direction) is called the x direction
  • the horizontal direction is called the y direction
  • the vertical direction is called the z direction. It shall be.
  • the vibrating body 1 has a surface shape in which a pair of vertically-divided cylindrical surfaces 5 are formed in parallel and a valley portion 6 is formed between one side portions of adjacent vertically-divided cylindrical surfaces 5. .
  • the vibrating body 1 in the illustrated example includes a pair of curved plates 11 that are curved along the vertically split cylindrical surface 5, and a connecting plate 12 that connects these curved plates 11. Sides forming the valley 6 are joined together.
  • the connecting plate 12 is provided at both ends of the valley portion 6 so as to block the entire valley portion 6.
  • the extending direction of the valley portion 6 is a vertical direction or a length direction, and a direction perpendicular to the vertical direction is a horizontal direction.
  • the material of the vibrating body 1 is not limited, and a synthetic resin, paper, metal, or the like generally used as a diaphragm for a speaker can be used.
  • a synthetic resin such as polypropylene or polyester can be used.
  • the film made of can be formed relatively easily by vacuum forming.
  • the pair of curved plates 11 are arranged in parallel so that the convex direction faces the same surface side, and adjacent side portions are joined with the tangential direction in common. Therefore, the trough 6 is formed between the curved plates 11 in a straight line along the longitudinal direction of the vertically split cylindrical surface 5.
  • the joint portion of the two curved plates 11 serves as a reinforcing portion 13, and the reinforcing portion 13 is formed by, for example, bonding the one side portions of the two curved plates 11 to each other as shown in FIG. It is formed in the shape of a belt along the extending direction.
  • the actuator 2 mentioned later is connected to the position (preferably center position) in the middle of the length direction (vertical direction of the vertically divided cylindrical surface 5) of this reinforcement part 13. As shown in FIG. Further, in order to obtain a uniform sound source, it is preferable to form both curved plates 11 symmetrically with respect to the tangent L of the valley 6 as shown in FIGS.
  • a voice coil motor is used for the actuator 2, and the actuator 2 includes a voice coil 20 joined to a midway position in the length direction of the reinforcing portion 13 of the curved plate 11 and a magnet mechanism 21 fixed to the support frame 3. .
  • two actuators 2 are provided at intervals in the length direction of the reinforcing portion 13 of the curved plate 11.
  • the voice coil 20 is formed by winding a coil 20b around a cylindrical bobbin 20a, and the upper end and the reinforcing portion of the voice coil 20 are arranged so that the reinforcing portion 13 of the curved plate 11 is arranged in the diameter direction thereof. 13 is fixed to the lower edge via an adhesive or the like.
  • the outer periphery of the voice coil 20 is supported by the support frame 3 via the damper 22, and the voice coil 20 can reciprocate along the axial direction of the voice coil 20 with respect to the support frame 3.
  • the damper 22 is made of a material used for a general dynamic speaker.
  • the magnet mechanism 21 includes an annular magnet 23, a ring-shaped outer yoke 24 fixed to one pole of the magnet 23, and an inner yoke 25 fixed to the other pole. By disposing the tip of the central pole portion 25 a in the outer yoke 24, an annular magnetic gap 26 is formed between the outer yoke 24 and the inner yoke 25, and a voice coil is formed in the magnetic gap 26. 20 ends are arranged in the inserted state.
  • the edge portion 4 is formed in a rectangular frame shape corresponding to the outer peripheral portion of the vibrating body 1.
  • the edge portion 4 can also be made of a material used for a general dynamic speaker.
  • the support frame 3 and the edge portion 4 constitute a support portion 35 that supports the vibrating body 1 so as to vibrate in the depth direction (z direction) of the trough portion 6.
  • the reinforcing portion 13 of the curved plate 11 according to the first embodiment is formed in a band shape by bonding one side portions of the two curved plates 11, but as shown in FIGS.
  • the reinforcement part of a vibrating body can also be formed with another structure.
  • 7 to 15 show a vibrating body used in other embodiments of the present invention.
  • components actuators, support frames, edge portions, etc.
  • FIG. 9 and FIGS. 11 to 15 only the vicinity of the connection portion between the vibrating body and one actuator is shown.
  • the thickness of the reinforcing tool 41 can be, for example, 1 mm or less, and the width of the flat surface between the vertically divided cylindrical surfaces 5 can be reduced. Or you may make it form a part of vertically-separated cylindrical surface 5 with the reinforcement tool 41 by forming the side surface of the reinforcement tool 41 which faces the trough part 6 in the shape of a groove
  • a bonding tool such as a wire may be fixed along the bonding portion of the two curved plates 11 to hold the bonding portion in a straight line.
  • the center part of one film is shape
  • the reinforcing portions 13 are formed in a straight line by welding the side portions of the two by pressing them while heating.
  • a U-shaped cross section is formed so as to collectively cover one side portions of the pair of vertically split cylindrical surfaces 5 (curved plates 11) from the outside.
  • the reinforcing part 13 can also be formed by attaching the reinforcing tool 42 to the joint part 11 a of the two curved plates 11. In this case, since the reinforcing effect by the reinforcing tool 42 is obtained, the rigidity of the reinforcing portion 13 can be further improved.
  • the directivity of sound in the lateral direction along the circumferential direction of the vertically split cylindrical surface 5 is similar to the diaphragm used in the Riffel type speaker. It is wide and narrow in the vertical direction. Further, like the Riffel type speaker, it has a wide directivity in the mid-high range.
  • the reinforcement part 13 is provided in the bottom part of the trough part 6 of the vibrating body 1 along the extending direction of the trough part 6, and the rigidity of the trough part 6 is improved.
  • the upper end portion of the cylindrical voice coil 20 of the actuator 2 and the reinforcing portion 13 of the vibrating body 1 are fixed.
  • the actuator 2 is connected midway in the length direction of the reinforcing portion 13. Nevertheless, the deflection of the reinforcing portion 13 due to the reciprocating motion of the actuator 2 can be reduced, and the reciprocating motion of the actuator 2 can be stably transmitted to the vibrating body 1.
  • the drive of the actuator 2 can be reliably transmitted to the vibrating body 1 even in a high sound range with a high frequency, and a high sound pressure can be obtained in the high sound range.
  • the actuator of this embodiment the actuator 2 that is used for a normal dynamic speaker can be applied, and the actuator 2 can be manufactured at low cost.
  • both the vertically-divided cylindrical surfaces 5 are formed as a shape having a common tangent L at the valley 6, and the actuator reciprocates along the same direction as the tangent L of the valley 6. 2 are connected. For this reason, the reciprocating motion of the actuator 2 can be efficiently applied to the end of the curved plate 11, and the curved plate 11 can be driven with a fast response speed and less loss during transmission.
  • both ends of the valley portion 6 are in an open state, a part of the sound wave radiated by the diaphragm 1 passes through the opened space to the back side of the curved plate 11, but the connecting plate 12. Since both ends of the valley portion 6 are blocked by the above, it is possible to prevent sound waves from coming off to the back side of the curved plate 11 and efficiently emit sound from the entire front surface of the vibrator 1. .
  • FIGS. 11 to 15 show other embodiments of the vibrator and actuator constituting the speaker of the present invention.
  • the connection portion 43 provided at the upper end portion of the voice coil 20 has a flat band shape along the extending direction of the valley 6 of the vibrating body 1 (the length direction of the vibrating body 1). Is formed.
  • the voice coil 20 has a coil 20b wound around a bobbin 20a made of paper or the like (see FIG. 1), and the bobbin 20a above the coil 20b is crushed in the radial direction.
  • a flat connection portion 43 is formed in the diameter direction of the voice coil 20.
  • the connecting portion 43 and the reinforcing portion 13 of the vibrating body 1 are overlapped and fixed by a method such as adhesion, and the connecting portion 43 and the reinforcing portion 13 are firmly connected on the surface, thereby vibrating.
  • the driving force of the actuator can be accurately and reliably transmitted to the body 1.
  • the voice coil 20 of the actuator shown in FIG. 12 has a cylindrical shape as a whole, and a concave groove portion 44 along the extending direction of the valley portion 6 of the vibrating body 1 is formed in the diameter direction of the voice coil 20 at the upper end portion thereof.
  • the reinforcing portion 13 of the vibrating body 1 is engaged with and fixed to the concave groove portion 44.
  • the concave groove portion 44 is compared with the case where the reinforcing portion 13 is placed and joined to the upper end of a simple cylindrical voice coil without the concave groove portion 44.
  • the connection area between the vibrating body 1 and the voice coil 20 can be increased by an amount corresponding to this depth, and these can be firmly connected.
  • the voice coil 20 of the actuator shown in FIGS. 13 and 14 is provided with a dust cap 51 that closes the opening of the voice coil 20, and the vibrating body 1 is fixed to the dust cap 51.
  • a recessed groove 51b is provided along the extending direction of the valley 6 of the vibrating body 1, and the reinforcing portion 13 of the vibrating body 1 is engaged and fixed to the recessed groove 51b.
  • the concave groove 51b allows the reinforcing portion 13 of the vibrating body 1 to be firmly connected to the dust cap 51 by the surface, and the dust cap 51 itself can be firmly connected to the opening of the voice coil 20 by the surface.
  • the driving force can be accurately and reliably transmitted.
  • a cap 52 that can be fitted to the upper end portion of the voice coil 20 is formed integrally with the reinforcing portion 13 to which one side portion of the curved plate 11 is joined as in the vibrating body 1 shown in FIG.
  • the actuator and the vibrating body 1 can be firmly connected to each other by the surface, and the driving force of the actuator is accurately and reliably transmitted to the vibrating body 1. can do.
  • the vibrating body is supported on the support frame by the edge portion so as to be reciprocally movable.
  • the vibrating body includes one having no edge portion.
  • the connecting plate is removed, or the connecting plate is provided only at the lower end of the valley portion, and the side portion opposite to the joint portion of both curved plates is fixed to the support frame. .
  • the vibration of the curved plate is reflected at the fixed part. Can be reduced.
  • the voice coil motor is applied as the conversion unit that reciprocally drives the vibrating body
  • a piezoelectric element or the like may be used instead of the voice coil motor.
  • the conversion units are provided at two positions with an interval in the length direction (x direction) of the reinforcing portion of the vibrator, but the number of conversion units is limited to two. Instead, one or three or more may be arranged at the center in the length direction (x direction) of the reinforcing portion of the vibrating body or at intervals in the length direction of the reinforcing portion.
  • the present invention is applied to a speaker, but the present invention can also be applied to a microphone.
  • a conversion unit such as a voice coil motor converts an electric signal based on a sound signal into vibration of a vibrating body.
  • a voice coil is used as the conversion unit.
  • a motor or the like can be used, and the conversion unit in that case converts the vibration of the vibrating body that receives a sound wave to vibrate into an electric signal.
  • the vertically split cylindrical surface is the vibration surface, and the vibration member is provided with the reinforcing portion, so that the vibration is transmitted reliably and the directivity is maintained while maintaining the sensitivity. And the sound can be collected with a wide directivity over a wide frequency band from a low sound range to a high sound range.
  • SYMBOLS 1 Vibrating body, 2 ... Actuator (conversion part), 3 ... Support frame, 4 ... Edge part, 5 ... Vertically split cylindrical surface, 6 ... Valley part, 11 ... Curved plate, 12 ... Connection plate, 13 ... Reinforcement part 20 ... Voice coil, 20a ... Bobbin, 20b ... Coil, 21 ... Magnet mechanism, 22 ... Damper, 23 ... Magnet, 24 ... outer yoke, 25 ... inner yoke, 25a ... pole part, 26 ... magnetic gap, 30 ... flange part, 31 ... arm part, 32 ... annular frame part, 41 ... reinforcing tool, 42 ... reinforcing tool, 43 ... connecting part, 44 ... concave groove, 51 ... dust cap, 51b ... concave groove, 52 ... cap

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

L'invention concerne un transducteur électroacoustique à faible coût qui peut transmettre de manière fiable des vibrations entre une unité de conversion, un moteur de bobine vocale par exemple, et un corps vibrant comprenant une paire de surfaces vibrantes incurvées, sur la totalité de la direction dans le sens de la longueur du corps vibrant. Un transducteur électroacoustique comprend : un corps vibrant 1 dans lequel une paire de surfaces cylindriques divisées longitudinalement 5 sont formées en parallèle, et une vallée 6 est formée entre des sections latérales respectives des surfaces cylindriques divisées longitudinalement 5, les sections latérales étant adjacentes ; et un actionneur 2 qui entraîne le corps vibrant 1 en va-et-vient le long de la direction dans le sens de la profondeur de la vallée 6. La vallée 6 du corps vibrant 1 est formée via une partie de jonction où la paire de surfaces cylindriques divisées longitudinalement 5 sont réunies l'une à l'autre. Une partie de renfort 13 est prévue à la partie de jonction le long de la direction dans le sens de l'extension de la vallée 6. L'actionneur 2 est connecté à une position qui est à mi-chemin le long de la direction dans le sens de la longueur de la partie de renfort 13.
PCT/JP2015/050432 2015-01-09 2015-01-09 Transducteur électroacoustique WO2016110991A1 (fr)

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PCT/JP2015/050432 WO2016110991A1 (fr) 2015-01-09 2015-01-09 Transducteur électroacoustique

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PCT/JP2015/050432 WO2016110991A1 (fr) 2015-01-09 2015-01-09 Transducteur électroacoustique

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55144489U (fr) * 1979-04-03 1980-10-16
JPS5721200A (en) * 1980-07-11 1982-02-03 Shigeya Nishihara Moving coil type speaker
JPS5843091U (ja) * 1981-09-17 1983-03-23 澤藤　正 電気音響変換器用振動板
JPH02283199A (ja) * 1989-04-24 1990-11-20 Minebea Co Ltd ハイアスペクト・スピーカ
JPH08102988A (ja) * 1994-09-29 1996-04-16 Foster Electric Co Ltd スピーカ
JPH10191494A (ja) * 1996-10-30 1998-07-21 Matsushita Electric Ind Co Ltd スピーカ
JPH1127792A (ja) * 1997-07-07 1999-01-29 Foster Electric Co Ltd スピーカ用振動板の製造方法
JP2001054191A (ja) * 1999-08-05 2001-02-23 Matsushita Electric Ind Co Ltd スピーカ
JP2002078079A (ja) * 2000-08-24 2002-03-15 Pioneer Electronic Corp 電気音響変換器
JP2009159248A (ja) * 2007-12-26 2009-07-16 Yukihiro Ando スピーカー

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55144489U (fr) * 1979-04-03 1980-10-16
JPS5721200A (en) * 1980-07-11 1982-02-03 Shigeya Nishihara Moving coil type speaker
JPS5843091U (ja) * 1981-09-17 1983-03-23 澤藤　正 電気音響変換器用振動板
JPH02283199A (ja) * 1989-04-24 1990-11-20 Minebea Co Ltd ハイアスペクト・スピーカ
JPH08102988A (ja) * 1994-09-29 1996-04-16 Foster Electric Co Ltd スピーカ
JPH10191494A (ja) * 1996-10-30 1998-07-21 Matsushita Electric Ind Co Ltd スピーカ
JPH1127792A (ja) * 1997-07-07 1999-01-29 Foster Electric Co Ltd スピーカ用振動板の製造方法
JP2001054191A (ja) * 1999-08-05 2001-02-23 Matsushita Electric Ind Co Ltd スピーカ
JP2002078079A (ja) * 2000-08-24 2002-03-15 Pioneer Electronic Corp 電気音響変換器
JP2009159248A (ja) * 2007-12-26 2009-07-16 Yukihiro Ando スピーカー

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