Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
  • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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
  • H04R7/127—Non-planar diaphragms or cones dome-shaped
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
  • H04R9/06—Loudspeakers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R7/00—Diaphragms for electromechanical transducers; Cones
  • H04R7/16—Mounting or tensioning of diaphragms or cones
  • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery

Definitions

• the present invention relates to an electroacoustic transducer and headphones.
• An electroacoustic transducer installed in headphones or the like includes a diaphragm that vibrates with a voice coil.
• the diaphragm has a main dome arranged at the center and a sub-dome surrounding the main dome.
• the electroacoustic transducer vibrates the diaphragm in a piston motion mode during low frequency reproduction, and vibrates the diaphragm in a split vibration mode during high frequency reproduction, for example.
• the above-mentioned split vibration mainly occurs in the sub-dome.
• a peak/dip occurs near the natural frequency of the subdome.
• it may be considered to use sound absorbing materials, acoustic resistance materials, etc., or to use materials with high internal loss for the diaphragm, but such methods will not improve split vibration.
• major side effects such as deterioration of sound quality
• the present invention has been made in view of these points, and it is an object of the present invention to suppress the occurrence of peaks and dips caused by split vibration without deteriorating sound quality.
• a diaphragm having a main dome disposed on the center side, a sub-dome annularly surrounding the main dome, a support portion fixedly supporting an outer peripheral edge of the sub-dome, and a diaphragm having a main dome disposed at the center; a voice coil that is provided on the back side of the plate and vibrates the diaphragm, and the sub-dome differs in at least one of a distance from the outer peripheral edge in the radial direction and a position in the height direction, and has a plurality of first vertices and a plurality of second vertices located at predetermined intervals in the circumferential direction, and the plurality of first vertices and second vertices are located on an annular curved surface continuous in the circumferential direction.
• the company provides electroacoustic transducers.
• the distance of the first vertex from the outer peripheral edge is different from the distance of the second vertex from the outer peripheral edge, and the position of the first vertex in the height direction is equal to the height of the second vertex. It may be different from the position in the direction.
• the distance of the first vertex from the outer peripheral edge is smaller than the distance of the second vertex from the outer peripheral edge, and the position of the first vertex in the height direction is equal to the height of the second vertex. It may be higher than the position in the direction.
• a first curved profile of a first section obtained by cutting the sub-dome along a first surface including the first apex and parallel to the radial direction and the height direction includes the second apex and includes the radial direction and the height direction.
• the curved surface may be connected to a second curved profile of a second section obtained by cutting the sub-dome with a second surface parallel to the height direction.
• the numbers of the first vertices and the second vertices may each be larger than 2 and an odd number.
• first vertices are located on the first curved contours of the first cross sections at 120 degree intervals in the circumferential direction
• second vertices are located on the second curved contours of the first cross sections at 120 degree intervals in the circumferential direction. may be respectively located on the second curved contours.
• first apex and the second apex may be alternately located at equal angular intervals in the circumferential direction.
• first vertex is the vertex at the shortest first distance from the outer peripheral edge
• second vertex is the vertex at the longest second distance from the outer peripheral edge
• first vertex is the vertex at the longest second distance from the outer peripheral edge.
• second apex are larger than the first distance but smaller than the second distance, and the distance from the outer peripheral edge continuously changes along the circumferential direction. It may be located at
• first apex is the apex with the highest first height in the height direction
• second apex is the apex with the lowest second height in the height direction
• second apex is the apex with the lowest second height in the circumferential direction.
• the plurality of vertices between the first apex and the second apex are larger than the second height but smaller than the first height, and the heights thereof continuously change along the circumferential direction. It may be located as follows.
• a second aspect of the present invention provides headphones having the electroacoustic transducer described above.
• FIG. 1 is a schematic diagram for explaining the configuration of an electroacoustic transducer 10 according to one embodiment. 1 is a schematic diagram for explaining headphones 1.
• FIG. FIG. 3 is a schematic diagram for explaining the planar configuration of a diaphragm 16 according to the first embodiment. 3 is a schematic perspective view of a diaphragm 16.
• FIG. 2 is a schematic diagram for explaining the cross-sectional configuration of a sub-dome 24.
• FIG. FIG. 4 is an explanatory diagram for explaining the effect of the shape of the sub-dome 24.
• FIG. FIG. 7 is a schematic diagram for explaining the configuration of a diaphragm 16 according to a second embodiment.
• FIG. 7 is a schematic diagram for explaining the cross-sectional configuration of a sub-dome 24 according to a second embodiment.
• FIG. 7 is a schematic diagram for explaining the cross-sectional configuration of a sub-dome 24 according to a third embodiment.
• FIG. 7 is a schematic diagram for explaining the configuration of a diaphragm 16 according to a fourth embodiment.
• FIG. 1 is a schematic diagram for explaining the configuration of an electroacoustic transducer 10 according to one embodiment.
• FIG. 2 is a schematic diagram for explaining the headphones 1.
• the electroacoustic transducer 10 is here a driver unit mounted in the headphones 1 shown in FIG. 2.
• the headphone 1 is a device that combines a device that converts an electric signal output from a playback device or a receiver into a sound wave using a sounding body that is close to the user's U ear.
• the electroacoustic transducer 10 may be installed in, for example, an earphone instead of the headphones 1.
• the electroacoustic transducer 10 includes a yoke 12, a flange portion 14, a diaphragm 16, and a voice coil 18.
• the yoke 12 is formed into a cylindrical shape with a bottom.
• a magnet is arranged inside the yoke 12.
• the flange portion 14 is formed in an annular shape on the outer peripheral surface of the yoke 12.
• the flange portion 14 has a function of a support portion that supports the outer peripheral edge side of the diaphragm 16.
• the diaphragm 16 radiates sound waves into the air by vibrating.
• the diaphragm 16 is made of a very thin and light material in order to vibrate at high speed.
• the diaphragm 16 tends to vibrate in a piston motion mode when reproducing low frequencies, and in a split vibration mode when reproducing high frequencies.
• the diaphragm 16 has a main dome 22 and a sub-dome 24, as shown in FIG.
• the main dome 22 is formed in a hemispherical shape and is placed at the center of the diaphragm 16.
• the sub-dome 24 surrounds the main dome 22 in an annular manner.
• the sub-dome 24 is connected to the main dome 22 as shown in FIG.
• the outer peripheral edge 25 of the sub-dome 24 is fixedly supported by the flange portion 14.
• the voice coil 18 has a function of converting audio signals into vibrations.
• the voice coil 18 is provided on the back side of the diaphragm 16 and causes the diaphragm 16 to vibrate.
• the voice coil 18 is in contact with the connecting portion of the main dome 22 and the sub-dome 24.
• the voice coil 18 vibrates the diaphragm 16 to achieve full-range sound reproduction.
• the split vibration mainly occurs in the subdome 24.
• the diaphragm is vibrated in the split vibration mode, peaks and dips occur near the natural frequency of the sub-dome 24 (particularly in the high frequency range).
• the surface shape of the sub-dome 24 of the diaphragm 16 is devised to suppress the occurrence of peaks and dips caused by split vibration without deteriorating the sound quality, although the details will be described later. is possible.
• FIG. 3 is a schematic diagram for explaining the planar configuration of the diaphragm 16 according to the first embodiment.
• FIG. 4 is a schematic perspective view of the diaphragm 16.
• FIG. 5 is a schematic diagram for explaining the cross-sectional configuration of the sub-dome 24. Note that FIG. 5(a) shows a schematic configuration of the AA cross section in FIG. 3, and FIG. 5(b) shows a schematic configuration of the BB cross section of FIG.
• the sub-dome 24 is formed so as to go around the outside of the main dome 22. Moreover, the sub-dome 24 is formed so that the curved cross section is continuous along the circumferential direction. That is, as shown in FIG. 4, the surface of the sub-dome 24 is smoothly connected in the circumferential direction, and there are no sharply uneven parts on the surface.
• the position of the apex of the sub-dome 24 is indicated by a broken line T.
• the apex indicated by the broken line T is located on an annular curved surface that is continuous in the circumferential direction.
• the positions of the vertices indicated by the broken line T in the radial direction differ in the circumferential direction.
• the height of the apex indicated by the broken line T is the same in the circumferential direction.
• the first apex T1 is the apex with the shortest distance from the outer circumferential edge 25 of the sub-dome 24 in the radial direction
• the apex T2 is also the apex with the longest distance from the outer circumferential edge 25 of the sub-dome 24 in the radial direction. It is the top.
• the distance of the first vertex T1 from the outer peripheral edge 25 is X1 as shown in FIG. 5(a)
• the distance of the first vertex T2 from the outer peripheral edge 25 is X1 as shown in FIG. 5(b). is X2.
• the sub-dome 24 has a plurality of first apexes T1 and second apexes T2 having different distances from the outer circumferential edge 25 in the radial direction. Note that the height of the first vertex T1 and the height of the second vertex T2 are the same.
• the plurality of first vertices T1 and second vertices T2 are located at predetermined intervals in the circumferential direction of the diaphragm 16. Specifically, the first vertices T1 are located at intervals of 120 degrees in the circumferential direction. Similarly, the second vertices T2 are also located at intervals of 120 degrees in the circumferential direction. Further, the first apex T1 and the second apex T2 are alternately located at equal angular intervals in the circumferential direction. Specifically, as shown in FIG. 3, three first apexes T1 and three second apexes T2 are alternately located at intervals of 60 degrees.
• FIG. 5(a) shows a first curved contour C1 including the first apex T1 of the sub-dome 24.
• the first curved contour C1 defines the sub-dome 24 at a first surface parallel to the radial direction and height direction of the diaphragm 16 (the first surface is a surface passing through the center of the diaphragm 16 and the first vertex T1). It is a surface contour of the sub-dome 24 in the first cut section.
• the first curved contour C1 is continuous without unevenness in the radial direction.
• FIG. 5(b) shows a second curved contour C2 including the second apex T2 of the sub-dome 24.
• the second curved contour C2 is a second surface parallel to the radial direction and the height direction of the diaphragm 16 (the second surface is a surface passing through the center of the diaphragm 16 and the second apex T2, and is similar to the first surface).
• This is a surface contour of the sub-dome 24 in a second section taken by cutting the sub-dome 24 at a plane rotated by a predetermined angle in the circumferential direction.
• the second curved contour C2 is continuous without unevenness in the radial direction.
• the shape of the first curved contour C1 is different from the shape of the second curved contour C2. Since the shapes of the first curved contour C1 and the second curved contour C2 are different in this way, the natural frequency of the first curved contour C1 and the natural frequency of the second curved contour C2 in the sub-dome 24 are different. , will be different, and the resonance frequency of the sub-dome 24 will be more easily dispersed.
• the first curved contours C1 are located on the cross section AA in FIG. 3, so they are located at intervals of 120 degrees in the circumferential direction of the sub-dome 24.
• the second curved contours C2 are located on the cross section BB in FIG. 3, so they are located at intervals of 120 degrees in the circumferential direction of the sub-dome 24.
• the first curved contour C1 and the second curved contour C2 are connected by a curved surface forming the surface of the sub-dome 24 (see FIG. 4).
• FIG. 6 is an explanatory diagram for explaining the effect of the shape of the sub-dome 24.
• the frequency characteristics of the comparative example are shown by dotted lines, and the frequency characteristics of the first example are shown by solid lines.
• the apex of the sub-dome has the same position in the radial direction and also has the same apex position in the height direction. In this case, it can be seen that peaks and dips occur in the high frequency range surrounded by circles P1 and P2 in FIG.
• the subdome 24 of the first example it is clear that the peak dip in the high frequency range is suppressed compared to the comparative example.
• the first embodiment since no sound absorbing material or acoustic resistance material is used, and no material with large internal loss is used for the diaphragm 16, side effects such as deterioration of sound quality do not occur. As a result, in the case of the first embodiment, it is possible to suppress the occurrence of peaks and dips in the high frequency range caused by split vibration without deteriorating the sound quality.
• FIG. 7 is a schematic diagram for explaining the configuration of the diaphragm 16 according to the second embodiment.
• FIG. 8 is a schematic diagram for explaining the cross-sectional configuration of the sub-dome 24 according to the second embodiment.
• FIG. 8(a) shows a schematic structure taken along the line AA in FIG. 7, and
• FIG. 8(b) shows a schematic structure taken along the line BB in FIG.
• the sub-dome 24 according to the second embodiment is also formed so as to go around the outside of the main dome 22, and the surface of the sub-dome 24 is smoothly connected in the circumferential direction. (There are no sharply uneven parts on the surface.)
• the apex of the sub-dome 24 is indicated by a broken line T.
• the position of the apex indicated by the broken line T in the radial direction is the same in the circumferential direction. That is, the distances from the outer peripheral edge 25 of each vertex of the sub-dome 24 indicated by the broken line T are the same.
• the height of the apex indicated by the broken line T varies in the circumferential direction.
• the first apex T1 is the highest apex in the height direction
• the second apex T2 is the lowest apex in the height direction.
• the height of the first vertex T1 from the outer peripheral edge 25 is Y1 as shown in FIG. 8(a)
• the height of the second vertex T2 from the outer peripheral edge 25 is Y1 as shown in FIG. 8(b). )
• it is Y2.
• the sub-dome 24 has a plurality of first apexes T1 and second apexes T2 at different positions in the height direction.
• the first apex T1 and the second apex T2 of the sub-dome 24 are alternately located at intervals of 60 degrees in the circumferential direction.
• the position in the height direction of the apex between the first apex T1 and the second apex T2 changes continuously along the circumferential direction, and is larger than Y2 and smaller than Y1. Since the sub-dome 24 has a plurality of vertices having different height positions in this way, the cross-sectional configuration of the sub-dome 24 changes along the circumferential direction, and the natural frequency changes for each part of the sub-dome 24. As a result, the resonance frequency of the sub-dome 24 is dispersed, and as a result, the occurrence of peaks and dips in the high frequency range of the sub-dome 24 can be suppressed.
• the first vertex T1 of the sub-dome 24 is located on the first curved contour C1 as shown in FIG. 8(a), and the second vertex T2 is located on the second curved contour C2 as shown in FIG. 8(b). positioned.
• the first curved contours C1 are located on the cross section AA in FIG. 7, so they are located at intervals of 120 degrees in the circumferential direction of the sub-dome 24.
• the second curved contours C2 are located on the cross section BB in FIG. 7, so they are located at intervals of 120 degrees in the circumferential direction.
• the first curved contour C1 and the second curved contour C2 of the sub-dome 24 are connected by a curved surface forming the surface of the sub-dome 24.
• the peak dip in the high frequency range is suppressed as in the first embodiment (see FIG. 6).
• the material of the sub-dome 24 of the second embodiment is the same as that of the sub-dome 24 of the first embodiment, and no sound absorbing material or acoustic resistance material is used, and a material with large internal loss is not used for the diaphragm 16. Therefore, side effects such as deterioration of sound quality do not occur.
• the occurrence of peaks and dips caused by split vibration can be suppressed without deteriorating the sound quality.
• FIG. 9 is a schematic diagram for explaining the cross-sectional configuration of the sub-dome 24 according to the third embodiment.
• FIG. 9(a) shows a first curved contour C1 of the sub-dome 24, and
• FIG. 9(b) shows a second curved contour C2 of the sub-dome 24.
• the first curved contour C1 is the contour of the sub-dome 24 at the AA cross-sectional position in FIG. 3
• the second curved contour C2 is the contour of the sub-dome 24 at the BB cross-sectional position in FIG. Therefore, the first curved contour C1 and the second curved contour C2 are each located at intervals of 120 degrees in the circumferential direction.
• the surface of the sub-dome 24 of the third embodiment is smoothly connected in the circumferential direction, and there are no sharply uneven parts on the surface.
• the first apex T1 and the second apex T2 of the sub-dome 24 of the third embodiment are a combination of the first apex T1 and the second apex T2 of the first embodiment and the second embodiment.
• the first vertex T1 is located on the first curved contour C1 as shown in FIG. 9(a), and the second vertex T2 is located on the second curved contour C2 as shown in FIG. 9(b). Therefore, the first apex T1 and the second apex T2 are alternately located at intervals of 60 degrees in the circumferential direction.
• the distance from the outer circumferential edge 25 of the first apex T1 of the sub-dome 24 is the distance from the outer circumferential edge 25 of the second apex T2. Unlike the distance, the position of the first vertex T1 in the height direction is different from the position of the second vertex T2 in the height direction.
• the distance of the first vertex T1 from the outer peripheral edge 25 is smaller than the distance from the outer peripheral edge of the second vertex T2, and the position of the first vertex T1 in the height direction is the position of the second vertex T2 in the height direction. taller than.
• the first apex T1 among the apexes of the sub-dome 24 is the apex closest to the outer peripheral edge 25 of the sub-dome 24 in the radial direction and the highest in the height direction.
• the second vertex T2 is the vertex furthest from the outer peripheral edge 25 of the sub-dome 24 in the radial direction and the lowest in the height direction.
• the sub-dome Since the surface of 24 becomes a more complicated curved surface, peak dips in the high frequency range can be suppressed more effectively than in the first and second embodiments.
• FIG. 10 is a schematic diagram for explaining the configuration of the diaphragm 16 according to the fourth embodiment.
• the first curved contour C1 where the first vertex T1 is located and the second curved contour C2 where the second vertex T2 is located are located at intervals of 120 degrees in the circumferential direction. And so.
• the fourth embodiment differs in that the first curved contour C1 and the second curved interval C2 are smaller than the 120 degree interval.
• the first curved contours C1 according to the fourth embodiment are located at cross section AA in FIG. Further, since the second curved contours C2 are located on the cross section BB in FIG. 10, they are spaced at intervals of 72 degrees in the circumferential direction of the sub-dome 24. Therefore, the number of first vertices T1 and second vertices T2 is five each.
• the numbers of the first vertices T1 and the second vertices T2 are each greater than 2 and an odd number. In this way, when the number of the first apex T1 and the second apex T2 is an odd number, the diaphragm It is possible to suppress the occurrence of an abnormal vibration mode in the low frequency range due to rolling (flapping) when the 16 vibrates.
• the number of first vertices T1 and second vertices T2 is preferably three or five, respectively. If the number of the first vertex T1 and the second vertex T2 is seven or more, the first vertex T1 and the second vertex T2 will approach each other, and the number between the first vertex T1 and the second vertex T2 will be This is because the range of the curved surface becomes narrower.
• the number of the first vertices T1 and the number of the second vertices T2 is three or five, respectively, but the number is not limited to this.
• the number of the first vertices T1 and the number of the second vertices T2 may be four.
• the subdomes 24 of the electroacoustic transducer 10 of the present embodiment described above differ in at least one of the distance from the outer peripheral edge 25 in the radial direction and the position in the height direction, and are located at predetermined intervals in the circumferential direction. It has a plurality of first vertices T1 and a plurality of second vertices T2. The plurality of first vertices T1 and second vertices T2 are located on an annular curved surface that is continuous in the circumferential direction.
• the distance from the outer circumferential edge 25 and the position of the apex of the sub-dome 24 in the height direction are factors that determine the resonance frequency and split resonance mode of the sub-dome 24, so at least the distance from the outer circumferential edge 25 and the position in the height direction

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
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• Diaphragms For Electromechanical Transducers (AREA)

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• 2023
  • 2023-07-13 JP JP2024538898A patent/JPWO2024029308A1/ja active Pending
  • 2023-07-13 CN CN202380051477.XA patent/CN119487870A/zh active Pending
  • 2023-07-13 AU AU2023318176A patent/AU2023318176B2/en active Active
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  • 2023-07-13 WO PCT/JP2023/025905 patent/WO2024029308A1/ja not_active Ceased
  • 2023-07-13 KR KR1020247042989A patent/KR20250016305A/ko active Pending
  • 2023-07-13 EP EP23849867.9A patent/EP4546819A4/en active Pending
• 2025
  • 2025-01-14 US US19/020,113 patent/US20250159410A1/en active Pending

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