Classifications

• • 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
  • H04R9/02—Details
  • H04R9/025—Magnetic circuit
• • 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
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
  • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
  • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
  • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
  • H04R2209/026—Transducers having separately controllable opposing diaphragms, e.g. for ring-tone and voice
• • 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
  • H04R9/02—Details
  • H04R9/04—Construction, mounting, or centering of coil
  • H04R9/041—Centering
  • H04R9/043—Inner suspension or damper, e.g. spider

Definitions

• the present invention relates to a speaker.
• Japanese Patent Application Laid-Open No. 2003-233633 discloses a speaker device for realizing high-quality sound reproduction.
• This speaker device includes a first magnetic circuit, a main body having a function of radiating sound waves, a second magnetic circuit formed integrally with the first magnetic circuit, and a vibration suppression unit.
• the main body has a first vibration unit driven by the first magnetic circuit, and the vibration suppression unit has a second vibration unit driven by the second magnetic circuit in a direction opposite to that of the first vibration unit.
• the second vibration unit provides the second magnetic circuit with vibration that cancels the vibration provided to the first magnetic circuit by the first vibration unit.
• An object of the present disclosure is to provide a speaker having a structure suitable for thinning.
• the speaker according to the first aspect is a speaker comprising a frame, a magnetic circuit, a first vibration part having a first bobbin, a first coil, and a first damper, and a second vibration part having a second bobbin, a second coil, and a second damper, one of the first vibration part and the second vibration part further comprising a coupler, an inner edge part of one of the first damper and the second damper is disposed radially outwardly spaced from an outer peripheral surface of one of the first bobbin and the second bobbin, the inner edge part of the one damper and the one bobbin are connected by the coupler, and the coupler comprises an avoidance part that avoids interference with the other of the first bobbin and the second bobbin.
• the speaker includes a frame, a magnetic circuit, and a first vibration part.
• the first vibration part has a first bobbin, a first coil, and a first damper.
• the first coil and the first bobbin are elastically supported relative to the frame by the first damper, and the first coil is driven in cooperation with the magnetic circuit.
• the speaker further includes a second vibration part.
• the second vibration part includes a second bobbin, a second coil, and a second damper.
• one of the first and second vibration parts further includes a coupler.
• An inner edge of one of the first and second dampers is disposed radially outwardly away from an outer circumferential surface of one of the first and second bobbins, and the inner edge of the one damper and the one bobbin are connected by the coupler.
• the coupler includes an avoidance portion that avoids interference with the other of the first and second bobbins. Therefore, the first vibration portion and the second vibration portion can be arranged closer to each other than in an embodiment in which the coupler does not include an avoidance portion. As a result, the speaker can be made thinner. Note that making the speaker thinner means making the speaker smaller in the vibration direction (amplitude direction) of each vibration portion, that is, making the overall height of the speaker smaller.
• the first vibration part has a coupler.
• this aspect also includes, for example, a speaker in which the first vibration part does not have a coupler and the second vibration part has a coupler, and also includes a speaker in which both the first vibration part and the second vibration part have couplers.
• the second vibration part vibrates to cancel out the vibration of the entire speaker caused by the first vibration part.
• the first vibration part and the second vibration part of this embodiment are not limited to this.
• the second vibration part may vibrate in the same direction in synchronization with the first vibration part, or may vibrate in a different manner for another function.
• both the first vibration part and the second vibration part may be vibration parts for producing sound.
• the second vibration part may be a vibration part for producing sound
• the first vibration part may be a vibration part for canceling out the vibration of the entire speaker caused by the second vibration part.
• the speaker according to the second aspect is the speaker according to the first aspect, in which the first vibration part is the one of the vibration parts, and the first vibration part further has a vibration plate, the inner edge part of the vibration plate is positioned radially outwardly spaced from the outer circumferential surface of the first bobbin, and the inner edge part of the vibration plate and the first bobbin are connected by the coupler.
• the first vibration part is one of the vibration parts, and the first vibration part further has a vibration plate, the inner edge of the vibration plate is disposed radially outwardly away from the outer circumferential surface of the first bobbin, and the inner edge of the vibration plate and the first bobbin are connected by a coupler. That is, the connection between the vibration plate and the first bobbin and the connection between the first damper and the first bobbin are realized by the coupler. Therefore, the speaker can be made thinner than in a configuration in which the connection between the diaphragm and the first bobbin and the connection between the first damper and the first bobbin are realized separately at different positions in the front-to-rear direction.
• the speaker according to the third aspect is the second aspect, but the inner edge of the diaphragm is located radially inward of the inner edge of the first damper.
• the inner edge of the diaphragm is located radially inward of the inner edge of the first damper. Therefore, the first vibration portion including the coupler, the diaphragm, and the first damper can be easily assembled.
• the fourth aspect of the speaker is any one of the first to third aspects, in which the coupler has a recess corresponding to the position where the transmission path is arranged.
• the coupler has a recess corresponding to the position where the transmission path is disposed. This makes it easy to arrange the transmission paths.
• the speaker according to the fifth aspect is any one of the first to fourth aspects, in which the coupler is molded with a conductive relay member as an insert.
• the coupler is molded with the conductive relay member as an insert part. Therefore, the relay member inserted in the coupler can relay the transmission path connected to the first coil and the transmission path connected to the outside of the speaker.
• the speaker according to the sixth aspect is any one of the first to fifth aspects, in which the first vibration part has an edge that elastically supports the outer edge of the diaphragm, and the outer edge of the first damper is located radially outward of the outer edge of the diaphragm.
• the first vibration portion has an edge that elastically supports the outer edge of the vibration plate, and the outer edge of the first damper is located radially outward of the outer edge of the vibration plate.
• the first damper is positioned behind the outer edge of the diaphragm, which can suppress interference between the outer edge of the diaphragm and other components.
• the distance in the front-to-rear direction between the diaphragm and the first damper can be set small, allowing the speaker to be made thinner.
• the seventh aspect of the speaker is any one of the first to sixth aspects, in which the frame has an opening that connects the space between the first damper and the second damper inside the speaker to the space outside the speaker.
• the frame has an opening that connects the space between the first damper and the second damper inside the speaker to the space outside the speaker. This allows air to escape from the space between the first damper and the second damper inside the speaker.
• the speaker according to the eighth aspect is any one of the first to seventh aspects, in which the coupler has a vertical wall portion against which the inner edge of the diaphragm abuts.
• the coupler has a vertical wall portion against which the inner edge portion of the diaphragm abuts. Therefore, the vertical wall portion of the coupler acts as a guide, and the diaphragm can be positioned at a desired position relative to the coupler.
• the first vibration part is a vibration part for producing sound
• the second vibration part vibrates to cancel out the vibration of the entire speaker caused by the first vibration part.
• the second vibrating portion is a vibrating portion for canceling out the vibration of the entire speaker caused by the first vibrating portion. This suppresses the vibration of the entire speaker, thereby suppressing the deterioration of sound quality caused by the vibration of the entire speaker.
• FIG. 1 is a cross-sectional view of a speaker according to a first embodiment.
• FIG. FIG. FIG. 2 is a cut-away end view of the coupler.
• FIG. FIG. FIG. 11 is a cross-sectional view of a speaker according to a second embodiment.
• Figure 1 is a cross-sectional view of the speaker 10 taken along an XZ plane passing through a central axis O1 of the speaker 10.
• the speaker 10 is mounted, for example, in the door of a vehicle.
• the speaker 10 is, for example, a woofer or subwoofer, and is capable of reproducing low frequencies with a large input.
• the main part of the speaker 10 is axially symmetrical with respect to the central axis O1.
• the speaker 10 has a first vibrating part 20 that vibrates to produce sound, a second vibrating part 30 that vibrates to offset the vibration of the entire speaker 10 caused by the first vibrating part 20, a magnetic circuit 40, and a frame 50 that supports these.
• the direction parallel to the central axis O1 is referred to as the axial direction
• the direction from the second vibrating part 30 to the first vibrating part 20 within the axial direction is referred to as the forward direction or upward direction
• the direction from the first vibrating part 20 to the second vibrating part 30 is referred to as the rearward direction or downward direction
• the direction perpendicular to the central axis O1 is referred to as the radial direction.
• the first vibrating part 20 has a first bobbin 21 , a first coil 22 , a first damper 27 , a diaphragm 24 , an edge 25 , a cap 26 , and a coupler 23 .
• the first bobbin 21 has a cylindrical shape coaxial with the central axis O1.
• the first coil 22 is wound around the outer peripheral surface at the rear end of the first bobbin 21.
• the diaphragm 24 is a member that radiates sound by vibrating.
• the diaphragm 24 has a circular hole at its center that is coaxial with the central axis O1, and has a shape that extends radially outward and forward from an inner edge portion 24a that defines the circular hole.
• An inner edge 24 a of the diaphragm 24 is joined to the coupler 23 .
• the outer edge 24b of the diaphragm 24 and the frame 50 are connected by an edge 25.
• An inner edge 25a of the edge 25 is joined to the front surface of the outer edge 24b of the diaphragm 24.
• the edge 25 is annular and has a U-shaped cross section that is convex forward.
• An outer edge 27b of the edge 25 is joined to the frame 50.
• the first damper 27 supports the first bobbin 21 so as to be vibrable in the direction of the central axis O1.
• the first damper 27 is disposed radially outward of the first bobbin 21 and rearward of the diaphragm 24.
• the first damper 27 is composed of a single elastic body 27 A.
• the elastic body 27 A has a circular hole at its center that is coaxial with the central axis O1, and is an annular disk-shaped elastic body that extends radially outward from an inner edge portion 27 a that defines the circular hole, and has a wavy shape (specifically, a shape that undulates back and forth depending on the radial position).
• An inner edge 27a of the elastic body 27A is joined to the front surface of an outer edge (fourth horizontal portion 69, see FIG. 5) of the coupler 23, and an outer edge 27b of the elastic body 27A is joined to the frame 50.
• each strip-shaped wiring 81 is provided on the front side of the elastic body 27A so as to follow the shape of the elastic body 27A.
• each strip-shaped wiring 81 has a wave-shaped shape.
• the two strip-shaped wirings 81 are disposed at symmetrical positions in the Y direction, and each extends parallel to the X direction.
• the inner connection portion 82a of the strip-shaped wiring 82 is connected to the second extension portion 23c2 (see FIG. 4) of the relay member 23c described later.
• the cap 26 is a member that emits sound by vibrating.
• the cap 26 covers the first bobbin 21 and the coupler 23 from the front.
• the outer edge of the cap 26 is joined to the front surface of the diaphragm 24.
• the coupler 23 is a component that emits sound by vibrating.
• the coupler 23 is a component that is arranged on the outer periphery of the first bobbin 21, and connects the first bobbin 21 to the diaphragm 24, as well as connecting the first bobbin 21 to the first damper 27.
• the coupler 23 basically has an axially symmetrical configuration with respect to the central axis O1.
• the coupler 23 has, from the inner edge to the outer edge, a first horizontal portion 61, a first vertical wall portion 62, a first inclined portion 63, a second horizontal portion 64, a second vertical wall portion 65, a third horizontal portion 66, a second inclined portion 67, a third vertical wall portion 68, and a fourth horizontal portion 69.
• These components have an axisymmetric shape with respect to the central axis O1, except for a portion where a recess 23b described later is formed.
• the first horizontal portion 61 is a portion that extends slightly radially inward from the rear end of the first vertical wall portion 62.
• the first horizontal portion 61 forms a circular hole that is coaxial with the central axis O1.
• the first vertical wall portion 62 has a cylindrical shape. A small radial gap is formed between the inner peripheral surface of the first vertical wall portion 62 and the outer peripheral surface of the first bobbin 21. Adhesive is poured into this gap.
• the first inclined portion 63 has a shape that inclines forward toward the outside in the radial direction.
• the first inclined portion 63 makes it easier to pour the adhesive that joins the first bobbin 21 and the coupler 23.
• the second horizontal portion 64 is a portion that extends radially outward from the front end of the first inclined portion 63.
• the second vertical wall portion 65 has a cylindrical shape. An inner edge portion 24 a of the diaphragm 24 is joined to an outer circumferential surface of the second vertical wall portion 65 .
• the avoidance portion 23a is formed by the first inclined portion 63, the second horizontal portion 64, and the second vertical wall portion 65. The avoidance portion 23a is provided to prevent interference between the coupler 23 and the second bobbin 31 when the speaker 10 is in operation. In other words, the avoidance portion 23a is a portion of the first vibrating portion 20 that is shaped to escape to the front side to prevent interference with the second bobbin 31.
• the third horizontal portion 66 is a portion that extends slightly radially outward from the rear end of the second vertical wall portion 65.
• the second inclined portion 67 has a shape that slopes rearward toward the radially outward direction.
• the third vertical wall portion 68 is a portion that extends slightly rearward from the rear end of the second inclined portion 67.
• the fourth horizontal portion 69 is a portion that extends radially outward from the rear end of the third vertical wall portion 68.
• the fourth horizontal portion 69 constitutes the outer edge of the coupler 23.
• the elastic body 27A of the first damper 27 is bonded to the front surface of the fourth horizontal portion 69 with an adhesive or the like.
• the coupler 23 has two recesses 23b.
• the two recesses 23b are formed at symmetrical positions in the Y direction.
• the front surface of the coupler 23 is recessed toward the rear side or toward the radially inward side.
• Each recess 23b is formed in a region extending in the X direction when viewed from the +Z direction, which is the front side.
• the recess 23b has a first horizontal surface 23b1, a vertical surface 23b2, and a second horizontal surface 23b3.
• the first horizontal surface 23b1 is a surface formed by the front surface of the second horizontal portion 64 being recessed rearward, and its normal direction faces forward.
• the vertical surface 23b2 is a surface formed by the second vertical wall portion 65, the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 being recessed radially inward, and its normal direction faces radially outward.
• the second horizontal surface 23b3 is a surface formed by the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 being recessed rearward, and its normal direction faces forward.
• the second horizontal surface 23b3 is formed on the same plane as the front surface of the fourth horizontal portion 69.
• the coupler 23 is formed by insert molding using two relay members 23c as insert parts.
• the two relay members 23c are conductive members and are arranged at positions corresponding to the two recesses 23b.
• the two relay members 23c have the same configuration.
• the relay member 23c is a member formed by bending a long plate material.
• the relay member 23c has a first extending portion 23c1 extending in the axial direction and a second extending portion 23c2 extending in a direction perpendicular to the axial direction (X direction).
• the plate material constituting the relay member 23c is bent at a right angle at the rear end of the first extending portion 23c1, and the second extending portion 23c2 extends in the +X direction from that portion.
• a portion of the front end side of the first extension portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recess 23b of the coupler 23, and wiring (not shown) connected to the first coil 22 is connected to this portion by soldering.
• a portion of the front end side of the first extension portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recess 23b, so that the front-to-back dimension of the first extension portion 23c1 can be reduced while maintaining the front-to-back dimension of the protruding portion.
• the front surface of a portion of the second extension portion 23c2 on the +X direction side is exposed at the front surface of the second horizontal surface 23b3 and the fourth horizontal portion 69 of the recess 23b of the coupler 23, and the inner connection portion 81a of the ribbon wiring 81 integrated with the elastic body 27A of the first damper 27 is joined to this portion by soldering.
• the second vibrating portion 30 includes a second bobbin 31 , a second coil 32 , a second damper 37 , a spacer 38 , and a weight 39 .
• the second bobbin 31 has a cylindrical shape coaxial with the central axis O1.
• the second bobbin 31 has a larger diameter than the first bobbin 21.
• the second coil 32 is formed by being wound around the outer circumferential surface of the rear end portion of the second bobbin 31 .
• the front end of the second bobbin 31 is located forward of the rear end of the first bobbin 21 .
• the second damper 37 supports the second bobbin 31 relative to the frame 50 so that the second bobbin 31 is capable of vibrating in the axial direction.
• the second damper 37 has a first elastic body 37A and a second elastic body 37B that are arranged with an axial gap between them.
• the first elastic body 37A and the second elastic body 37B are both disk-shaped elastic bodies that have a circular hole at the center that is coaxial with the central axis O1 and extend radially outward from the inner edge that forms the circular hole, and have a corrugated shape.
• the first elastic body 37A and the second elastic body 37B have approximately the same configuration. Therefore, the cross-sectional shapes of the first elastic body 37A and the second elastic body 37B overlap when they are translated in the axial direction.
• a spacer 38 for maintaining the axial distance between the first elastic body 37A and the second elastic body 37B is provided on the outer edge of the second damper 37.
• the rear surface of the outer edge of the second elastic body 37B is joined to the frame 50.
• the inner edge of the first elastic body 37A and the inner edge of the second elastic body 37B are joined to the outer circumferential surface of the second bobbin 31.
• Each strip-shaped wiring 82 is integrated with the first elastic body 37A.
• Each strip-shaped wiring 82 is provided on the front surface side of the first elastic body 37A so as to follow the shape of the first elastic body 37A. That is, each strip-shaped wiring 82 has a wave shape.
• the two strip-shaped wirings 82 are disposed at symmetrical positions in the Y direction and extend in parallel along the X direction.
• the inner connection portion 82 a of the strip-shaped wiring 82 is connected to a transmission path formed on the outer circumferential surface of the second bobbin 31.
• the weight 39 is provided to increase the mass of the part that is supported and vibrates by the second damper 37. By increasing the mass of the part that is supported and vibrates by the second damper 37, it is possible to reduce the amplitude of the second vibrating part 30 while maintaining the effect of canceling out the vibration of the entire speaker 10 caused by the second vibrating part 30.
• the weight 39 is annular and has a circular ring shape that follows the cylindrical shape of the second bobbin 31.
• the weight 39 is provided near the inner edge of the second damper 37. Specifically, the weight 39 is disposed between the first elastic body 37A and the second elastic body 37B near the inner edge of the second damper 37. Thus, the weight 39 is disposed so as to surround the second bobbin 31.
• FIG. 6 is an enlarged perspective view of the weight 39.
• the weight 39 has two recesses 39a.
• the recesses 39a of the weight 39 increase the distance between the inner peripheral surface of the weight 39 and the outer peripheral surface of the second bobbin 31 in the portion of the circumference in which the recesses 39a are formed.
• the two recesses 39a are formed in positions facing each other across the central axis O1.
• One of the two recesses 39a is formed in a range that includes the position where the inner connection portions 82a of the two strip wirings 82 described above connect to the transmission path formed on the outer peripheral surface of the second bobbin 31.
• the weight 39 has a front surface 71, a rear surface 72, an outer peripheral surface 73, and an inner peripheral surface 74.
• the front surface 71 is a plane whose normal direction faces forward
• the rear surface 72 is a plane whose normal direction faces backward.
• the outer peripheral surface 73 is a curved surface whose normal direction faces radially outward, and is formed on one circumference centered on the central axis O1 when viewed from the axial direction.
• the inner peripheral surface 74 has a first inner peripheral surface 74a corresponding to a circumferential position where the recess 39a is not formed, and a second inner peripheral surface 74b corresponding to a circumferential position where the recess 39a is formed.
• the weight 39 also has a connection surface 74c that connects the first inner circumferential surface 74a and the second inner circumferential surface 74b.
• Two connection surfaces 74c are formed for each second inner circumferential surface 74b.
• the two connection surfaces 74c face in directions opposite to each other (Y direction). In other words, the two connection surfaces 74c are parallel to each other.
• the magnetic circuit 40 has a first magnetic member 41 (top plate), a first magnet 42, an intermediate magnetic member 43 (first yoke), a second magnet 44, and a second magnetic member 45 (second yoke).
• the magnetic circuit 40 is formed by stacking the second magnet 44, the intermediate magnetic member 43, the first magnet 42, and the first magnetic member 41 coaxially in this order from the second magnetic member 45 arranged at the rearmost.
• the second magnetic member 45 has a disk-shaped bottom 45a, a cylindrical portion 45b standing forward from the outer edge of the bottom 45a, a cylindrical protrusion 45c protruding forward from the center of the bottom 45a, and a mounting flange 45d extending radially outward from the front end of the cylindrical portion 45b.
• the mounting flange 45d is attached to the frame 50.
• a recess 45a1 is provided on the rear surface of the bottom 45a.
• the second magnet 44 is joined to the front surface of the protrusion 45c.
• the second magnet 44 is cylindrical.
• the diameter of the second magnet 44 is larger than the diameter of the first magnet 42.
• the intermediate magnetic member 43 is joined to the front surface of the second magnet 44.
• the intermediate magnetic member 43 has a disk-shaped bottom portion 43a, a cylindrical portion 43b standing forward from the periphery of the bottom portion 43a, and a cylindrical protrusion 43c protruding forward from the center of the bottom portion 43a.
• the first magnet 42 is joined to the front surface of the protrusion 43c.
• the first magnet 42 is cylindrical.
• the diameter of the first magnet 42 is approximately the same as the diameter of the protrusion 43c.
• the first magnetic member 41 is joined to the front surface of the first magnet 42.
• the first magnetic member 41 has a cylindrical shape.
• the diameter of the first magnetic member 41 is slightly larger than the diameter of the first magnet 42.
• the diameter of the bottom portion 43a of the intermediate magnetic member 43 is larger than the diameter of the cylindrical portion 43b. Therefore, an outer periphery 43a1 of the bottom portion 43a protrudes radially outward beyond the outer periphery of the cylindrical portion 43b.
• the outer periphery 43a1 of the bottom portion 43a is referred to as an outer protrusion 43a1.
• the front end of the cylindrical portion 45b of the second magnetic member 45 is substantially aligned with the front surface of the bottom portion 43a of the intermediate magnetic member 43 in the front-rear direction. Therefore, the outer protrusion 43a1 faces the front end of the cylindrical portion 43b of the second magnetic member 45 in the radial direction.
• the front end of the cylindrical portion 43 b of the intermediate magnetic member 43 is located forward of the front surface of the first magnetic member 41 .
• An annular gap is formed between the inner circumferential surface of the cylindrical portion 43b of the intermediate magnetic member 43 and the outer circumferential surfaces of the first magnetic member 41, the first magnet 42, and the protruding portion 43c.
• a first magnetic gap G1 is formed between the outer circumferential surface of the first magnetic member 41 and the inner circumferential surface of the cylindrical portion 43b, and a magnetic field that is approximately uniform in the circumferential direction is generated in the first magnetic gap G1.
• the bottom 43a of the intermediate magnetic member 43, the second magnet 44, and the protruding portion 45c of the intermediate magnetic member 43 are located inside the cylindrical portion 45b of the intermediate magnetic member 43.
• An annular gap is formed between the inner peripheral surface of the cylindrical portion 45b and the outer peripheral surfaces of the bottom 43a, the second magnet 44, and the protruding portion 45c.
• a magnetic field that is approximately uniform in the circumferential direction is generated in a second magnetic gap G2 formed by the outer peripheral surface of the bottom 43a (the outer peripheral surface of the outer protruding portion 43a1) and the inner peripheral surface of the cylindrical portion 45b.
• the frame 50 has a first support portion 51 that supports the outer edge portion 25b of the edge 25, a second support portion 52 that supports the outer edge portion 27b of the first damper 27, and a third support portion 53 that supports the outer edge portion of the second damper 37.
• the first support portion 51, the second support portion 52, and the third support portion 53 are all formed continuously on a circumference centered on the central axis O1.
• the first support portion 51, the second support portion 52, and the third support portion 53 are joined to the edge 25, the first damper 27, and the second damper 37 on their respective forward facing surfaces.
• the first support portion 51 is located at the front end, and the third support portion 53 is located at the rear end.
• the first support portion 51 has the largest diameter
• the third support portion 53 has the smallest diameter.
• the frame 50 has a first connecting portion 55 that connects the first support portion 51 and the second support portion 52. As shown in FIG. 7, a plurality of first connecting portions 55 are provided, separated in the circumferential direction. Therefore, a plurality of first openings 59A are formed between the first support portion 51 and the second support portion 52.
• the frame 50 has a second connecting portion 56 that connects the second support portion 52 and the third support portion 53. As shown in FIG. 7, the second connecting portion 56 is provided in a plurality of locations separated in the circumferential direction. Therefore, a plurality of second openings 59B are formed between the second support portion 52 and the third support portion 53. The circumferential position at which the second connecting portion 56 is provided coincides with the first connecting portion 55.
• the frame 50 has a fourth support portion 54 that supports the magnetic circuit 40.
• the plate thickness direction of the fourth support portion 54 is oriented in the axial direction.
• the frame 50 also has a third connecting portion 57 that connects the third support portion 53 and the fourth support portion 54.
• the third connecting portion 57 is formed continuously in the circumferential direction. Therefore, no opening is formed between the third support portion 53 and the fourth support portion 54.
• a first coil 22 is disposed in the first magnetic gap G1.
• the first coil 22 is connected to a transmission path.
• the first bobbin 21 vibrates together with the first coil 22 due to the action of an electric signal from the transmission path and the magnetic field of the first magnetic gap G1, and as a result, the first vibrating part 20 vibrates. This causes sound to be emitted.
• a first vibration force is generated in the speaker 10 in response to the vibration of the first vibrating part 20. This first vibration force causes the housing to which the speaker 10 is fixed to vibrate.
• a second coil 32 is disposed in the second magnetic gap G2.
• the second coil 32 is connected to the same transmission path as the first coil 22, and the second bobbin 31 vibrates together with the second coil 32 due to the action of an electric signal from the transmission path and the magnetic field of the second magnetic gap, causing the second vibrating part 30 to vibrate.
• the first vibration section 20 and the second vibration section 30 are configured to operate in opposite phases. Specifically, when the first vibration section 20 is displaced forward, the second vibration section 30 is displaced backward, and when the first vibration section 20 is displaced backward, the second vibration section 30 is displaced forward.
• the first vibration section 20 and the second vibration section 30 can be made to operate in opposite phases by adjusting the magnetization direction of each magnet, the direction of current flow, and the winding direction of the coil.
• the speaker 10 includes a frame 50, a magnetic circuit 40, and a first vibration part 20 that vibrates to produce sound.
• the first vibration part 20 has a first bobbin 21, a first coil 22, a first damper 27, and a diaphragm 24.
• the first coil 22 and the first bobbin 21 are elastically supported by the first damper 27 relative to the frame 50, and the first coil 22 is driven in cooperation with the magnetic circuit 40, causing the diaphragm 24 to vibrate and produce sound.
• the speaker 10 further includes a second vibrating part 30 that vibrates to cancel out the vibration of the entire speaker 10 caused by the first vibrating part 20.
• the second vibrating part 30 has a second bobbin 31, a second coil 32, and a second damper 37.
• the vibration of the first vibrating part 20 transmitted to the frame 50 is canceled out.
• This makes it possible to suppress the generation of unnecessary vibrations transmitted to the frame 50, and suppresses the vibration of the speaker 10.
• deterioration of sound quality caused by the vibration of the speaker 10 is suppressed.
• the first vibrating part 20 has a coupler 23.
• the inner edge part 24a of the vibration plate 24 is disposed radially outwardly spaced from the outer circumferential surface of the first bobbin 21, and the inner edge part 24a of the vibration plate 24 and the first bobbin 21 are connected by the coupler 23. That is, the vicinity of the inner edge of the diaphragm in the above-mentioned conventional technology is replaced with the coupler 23. Therefore, it is easy to ensure the rigidity of the member including the coupler 23 and the diaphragm 24 without increasing the height dimension of the diaphragm 24. As a result, the speaker 10 can be made thinner while suppressing the reverse vibration of the diaphragm 24.
• the coupler 23 includes an avoidance portion 23a that avoids interference with the second bobbin 31. Therefore, the first vibrating portion 20 and the second vibrating portion 30 can be disposed closer to each other than in a case where the coupler 23 does not include the avoidance portion 23a. As a result, the speaker 10 can be made thinner.
• the front end of the second bobbin 31 is located within the avoidance portion 23a.
• the inner edge portion 27a of the first damper 27 is positioned radially outwardly spaced from the outer peripheral surface of the first bobbin 21, and the inner edge portion 27a of the first damper 27 and the first bobbin 21 are connected by a coupler 23.
• the connection between the diaphragm 24 and the first bobbin 21 and the connection between the first damper 27 and the first bobbin 21 are realized by the coupler 23 . Therefore, the speaker 10 can be made thinner compared to a configuration in which the connection between the diaphragm 24 and the first bobbin 21 and the connection between the first damper 27 and the first bobbin 21 are realized separately at different positions in the front-to-rear direction.
• the inner edge 24a of the vibration plate 24 is located radially inward of the inner edge 27a of the first damper 27. This allows for easy assembly of the first vibration part 20, which includes the coupler 23, the vibration plate 24, and the first damper 27.
• the coupler 23 has a recess 23b that corresponds to the position where the transmission path is arranged. This makes it easy to arrange the transmission path.
• the coupler 23 is molded with a conductive relay member 23c as an insert. Therefore, the relay member 23c inserted into the coupler 23 can relay the transmission path connected to the first coil 22 and the transmission path connected to the outside of the speaker 10.
• the first vibrating portion 20 has an edge 25 that elastically supports an outer edge portion 24b of the vibration plate 24.
• the outer edge portion 27b of the first damper 27 is located radially outward of the outer edge portion 24b of the vibration plate 24. Therefore, the first damper 27 is located behind the outer edge 24b of the diaphragm 24, and interference between the outer edge 24b of the diaphragm 24 and other members can be suppressed. Therefore, the distance in the front-to-rear direction between the diaphragm 24 and the first damper 27 can be set small, and the speaker 10 can be made thinner.
• the frame 50 has a second opening 59B (see FIG. 7 ) that connects the space between the first damper 27 and the second damper 37 inside the speaker 10 to the space outside the speaker 10. This allows air to escape from the space between the first damper 27 and the second damper 37 inside the speaker 10.
• the coupler 23 has a vertical wall portion 65 against which the inner edge portion 24a of the diaphragm 24 abuts. Therefore, the vertical wall portion 65 of the coupler 23 acts as a guide, and the diaphragm 24 can be positioned at a desired position relative to the coupler 23.
• the magnetic circuit 40 has a first magnet 42, a second magnet 44, a first magnetic member 41 attached to the first magnet 42, a second magnetic member 45 attached to the second magnet 44, and an intermediate magnetic member 43 attached to both the first magnet 42 and the second magnet 44.
• the intermediate magnetic member 43 forms a first magnetic gap G1 between itself and the first magnetic member 41, and forms a second magnetic gap G2 between itself and the second magnetic member 45. Therefore, the intermediate magnetic member 43 can be used as a path for both the magnetic flux passing through the first magnetic gap G1 and the magnetic flux passing through the second magnetic gap G2, and the magnetic circuit 40 can be made thinner.
• the second vibrating section 30 has a weight 39. Therefore, compared to a configuration in which the second vibrating section 30 does not have a weight 39, the amplitude of the second vibrating section 30 can be reduced while maintaining the effect of canceling out the vibration of the entire speaker 10. As a result, the speaker 10 can be made thinner.
• the second bobbin 31 protrudes forward (upward) from the weight 39.
• the weight 39 does not protrude forward from the second bobbin 31. For this reason, it is easier to make the speaker 10 thinner than, for example, a configuration in which the weight 39 is positioned so as to be hooked onto the front end of the second bobbin 31.
• the second damper 37 has two elastic bodies 37A and 37B. This improves the symmetry and linearity of movement of the second vibrating part 30 during vibration. Furthermore, the weight 39 is disposed between the two elastic bodies 37A and 37B. This does not adversely affect the thinning of the speaker 10.
• the weight 39 has a recess 39a that expands the distance from the second bobbin 31 in a portion of the circumferential direction. Therefore, when soldering or the like is performed on the outer peripheral surface of the second bobbin 31, by providing the recess 39a corresponding to the location where the soldering is performed, it is possible to prevent a short circuit between the second bobbin 31 and the weight 39 caused by solder residue or other metal parts, etc.
• the second damper 37 has a first elastic body 37A that is integrated with the transmission path (strip wiring 82). Therefore, there is no need to provide space for the transmission path, which contributes to making the speaker 10 thinner.
• FIG. 8 shows a speaker 110 according to the second embodiment.
• the configuration of a second vibrating portion 130 is different from that of the second vibrating portion 30 of the first embodiment.
• the second vibration section 130 has a second damper 137.
• the second damper 137 has a first elastic body 137A and a second elastic body 37B arranged to overlap in the vibration direction.
• the first elastic body 37A has a recessed portion 37A1 recessed in a direction approaching the second elastic body 37B in the vibration direction, and the weight 139 is arranged on the surface of the recessed portion 37A1 opposite to the second elastic body 37B. Therefore, there is no need to perform an operation to arrange the weight 39 between the first elastic body 137A and the second elastic body 37B, and the dimensional expansion in the amplitude direction of the second vibration section 30 can be suppressed.
• each part of the first vibration part 20 and the second vibration part 30, 130 are not particularly limited.
• the vibration plate 24, the first damper 27, the elastic bodies 37A, 37B, and the cap 26 can be made of various materials such as paper, resin, metal, or a combination of these materials and ceramics.
• the edge 25 can be made of a relatively highly elastic polymer material such as rubber or resin.
• fiber materials may be used as the materials of each part of the first vibration part 20 and the second vibration part 30, 130.
• the base material of each part of the first vibration part 20 and the second vibration part 30, 130 may be coated with a rubber coat or the like.
• the frame 50 and the spacer 38 can be made of resin or paper materials, or metal non-magnetic materials.
• the diameters and thicknesses of each component shown in each figure are examples and are not limited to these shapes and dimensions.
• the coupler 23 is joined to one elastic body (the elastic body 27A)
• the present disclosure is not limited to this.
• the coupler may be joined to two or more elastic bodies.
• the example in which the diaphragm 24 and the first damper 27 are joined to the coupler 23 has been described.
• other components for example, a cap may also be joined to the coupler.
• the recess 23b is formed at a position corresponding to the entire transmission path provided in the coupler 23, but the recess of the present disclosure is not limited to this.
• the recess may be formed at least in a part of the position where the transmission path is provided.
• the coupler does not need to have a recess.
• the coupler 23 is molded using the conductive relay component 23c as an insert component, but the relay component of the present disclosure is not limited to this.
• the relay component may be held in the coupler by a method other than insert molding.
• the configuration of the weight 39 is not limited to that in the above embodiment.
• the weight may be attached to the inner peripheral surface side of the bobbin.
• the weight may be attached to the front end of the bobbin.
• the shape of the weight is not limited to annular, and may be, for example, polygonal.
• the weight may not have a recess.
• the weight may be in contact with the voice coil in an insulated state.
• the configuration of the second damper 37 is not limited to the above embodiment.
• the second damper may have one elastic body or three or more elastic bodies.
• two elastic bodies may be attached to the frame by providing a step in the frame without providing the spacer 38.

Landscapes

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=91956020

Family Applications (1)

Country Status (4)

Citations (7)

• 2024
  • 2024-01-15 JP JP2024547180A patent/JP7659707B2/ja active Active
  • 2024-01-15 WO PCT/JP2024/000851 patent/WO2024154703A1/ja not_active Ceased
  • 2024-01-15 DE DE112024000386.9T patent/DE112024000386T5/de active Pending
  • 2024-01-15 CN CN202480007877.5A patent/CN120530653A/zh active Pending

Patent Citations (7)

Also Published As

Similar Documents

Legal Events