EP3448061A1 - Coaxial dual voice coil speaker - Google Patents
Coaxial dual voice coil speaker Download PDFInfo
- Publication number
- EP3448061A1 EP3448061A1 EP18190740.3A EP18190740A EP3448061A1 EP 3448061 A1 EP3448061 A1 EP 3448061A1 EP 18190740 A EP18190740 A EP 18190740A EP 3448061 A1 EP3448061 A1 EP 3448061A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- voice coil
- flux plate
- central
- protruding portion
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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- 230000009977 dual effect Effects 0.000 title claims abstract description 18
- 230000004907 flux Effects 0.000 claims description 83
- 239000000696 magnetic material Substances 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 2
- 230000005347 demagnetization Effects 0.000 claims description 2
- 230000005415 magnetization Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- 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; 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
- H04R9/045—Mounting
-
- 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
- H04R9/06—Loudspeakers
- H04R9/063—Loudspeakers using a plurality of acoustic drivers
-
- 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
- H04R9/06—Loudspeakers
- H04R9/066—Loudspeakers using the principle of inertia
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Definitions
- the present invention relates to the electroacoustic field, and in particular, to the electroacoustic field of coaxial dual voice coil speakers.
- a moving-coil speaker When an electrical signal passes through a voice coil it induces a magnetic field and interacts with a magnetic field of a permanent magnet to drive a diaphragm to vibrate air, a moving-coil speaker having the permanent magnet and the diaphragm implements electroacoustic conversion.
- the moving-coil speaker generally has a single diaphragm and a single voice coil, that is, in all audio sections, electroacoustic conversion is implemented through vibration of the single diaphragm.
- the single diaphragm is not easy to balance a low frequency and a high frequency at the same time, and generally cannot satisfy a frequency range of 20 Hz to 20 kHz that is audible to human ears. Therefore, a design in which bass and treble are separate is used, and respective bands are separately replayed.
- a coaxial speaker means that a bass speaker and a treble speaker are placed at the same axis, and because the two speakers are located at the same axis and their physical positions are close to a point source, sound field positioning of replayed music is very ideal, and sound resolution is high.
- the speaker drives the two voice coils respectively by using two magnetic circuit systems. Therefore, the volume is greater than that of the one magnetic circuit of the single voice coil, and more magnets are required.
- the coaxial dual voice coil speaker includes a yoke, a ring-shaped magnet, a first concentrating flux plate, a second concentrating flux plate, a first voice coil, a second voice coil, and an isolating ring.
- the yoke may include a base and a column, where the column extends from one end of the base, and one end of the column away from the base has a protruding portion and a ring-shaped flange.
- the ring-shaped flange and the protruding portion are located in a same plane of the column, the ring-shaped flange surrounds the protruding portion, and there is a ring-shaped groove between the ring-shaped flange and the protruding portion.
- the ring-shaped magnet includes a first central axial hole, where the column passes through the first central axial hole, so that the ring-shaped magnet is sleeved on the yoke and comes into contact with the base.
- the first concentrating flux plate includes a first central through hole, where the column passes through the first central through hole, so that the first concentrating flux plate is disposed on the ring-shaped magnet.
- the protruding portion passes through the isolating ring, so that the isolating ring is disposed in the ring-shaped groove.
- the second concentrating flux plate includes a second central through hole, where the second central through hole and the first central through hole have a same central axis.
- the protruding portion passes through the second central through hole, so that the second concentrating flux plate is disposed on the isolating ring.
- the first voice coil is located in the first magnetic gap.
- the second voice coil is located in the second magnetic gap.
- the isolating ring is an aluminum ring.
- the height of the isolating ring is higher than that of the ring-shaped flange, the height of the protruding portion is higher than that of the ring-shaped flange, and there is a separating part between the second concentrating flux plate and the ring-shaped flange.
- the first concentrating flux plate and the second concentrating flux plate are substantially located at a same horizontal height.
- the base of the yoke has a thickness gradually decreasing from an area close to the protruding portion to a periphery.
- the first concentrating flux plate has a thickness gradually decreasing from an area close to the first central through hole to a periphery.
- the second concentrating flux plate further includes a step portion, and the step portion is neighboring to the second central through hole.
- the first voice coil is a bass voice coil
- the second voice coil is a treble voice coil
- the width of the isolating ring is greater than the width of the ring-shaped flange.
- the height of the ring-shaped magnet is substantially equal to the height from the base to a top end of the ring-shaped flange.
- the coaxial dual voice coil speaker can independently perform driving in high frequency and low frequency bands by using the first voice coil and the second voice coil, achieve a better sound parsing effect in the high frequency and low frequency parts, and can further achieve an effect of light weight, simple structure, and rapidness in assembling by reducing overall components by using a design in which the yoke is shared.
- the density of magnetic lines can be adjusted by adjusting a distance between the first concentrating flux plate and the second concentrating flux plate, a distance between the second concentrating flux plate and the protruding portion, and the widths and heights of the ring-shaped flange and the isolating ring, and a required frequency response is satisfied.
- FIG. 1 is a partially three-dimensional exploded view of a coaxial dual voice coil speaker; and FIG. 2 is a partially cross-sectional view of a coaxial dual voice coil speaker.
- FIG. 3 is an enlarged diagram of an area B in FIG. 2 .
- the coaxial dual voice coil speaker 1 includes a yoke 10, a ring-shaped magnet 20, a first concentrating flux plate 30, a second concentrating flux plate 40, a first voice coil 61, a second voice coil 63, and an isolating ring 70.
- the yoke 10, the ring-shaped magnet 20, the first concentrating flux plate 30, the second concentrating flux plate 40, the first voice coil 61, the second voice coil 63, and the isolating ring 70 have a same central axis A, and are coaxially disposed.
- the first concentrating flux plate 30 and/or the second concentrating flux plate 40 may be made of a magnetic material, which has high magnetic saturation, large magnetic permeability, and low coercivity. Further, the concentrating flux plates may be made of soft magnetic material that has a narrow hysteresis curve and rapidly magnetization and demagnetization.
- the magnetic reluctance of the magnetic material of each of the the concentrating flux plates 30, 40 is much smaller than the magnetic reluctance of the air. Normally, the magnetic permeability of the air is 1, and that of the soft magnetic material is 20,000.
- the concentrating flux plates 30, 40 using the magnetic material described above may have a uniform strong magnetic field in a necessary space, which is the path of the magnetic line and required for the magnetic circuit.
- the concentrating flux plates 30, 40 may be made from low-carbon steel such that the concentrating flux plates have a high saturation of magnetic induction intensity, a high permeability and a low coercivity.
- the high permeability means that the magnetic flux can more readily and easily pass through the concentrating flux plates 30, 40 than through air, and tends to condense the magnetic flux through these parts of the driver.
- the high saturation of magnetic induction intensity means that the concentration flux plates can be used to build a strong magnetic field in and around the voice coils to improve their movement during driving.
- the yoke 10 is a T-shaped yoke, including a base 11 and a column 13.
- the column 13 extends upward from one end of the base 11, and the other end of the column 13 away from the base 11 has a protruding portion 131 and a ring-shaped flange 133.
- the base 11 of the yoke 10 may be plate-shaped, hemispherical, or dish-shaped, and has a column 13 protruding from a center thereof.
- the ring-shaped flange 133 is located at a periphery of the protruding portion 131 and surrounds the protruding portion 131.
- the overall yoke 10 is substantially an inverted T-shaped.
- the ring-shaped magnet 20 includes a first central axial hole 21.
- the column 13 passes through the first central axial hole 21, so that the ring-shaped magnet 20 is sleeved on the yoke 10.
- the ring-shaped magnet 20 comes into contact with the base 11 of the yoke 10.
- the height of the ring-shaped magnet 20 is substantially equal to the height from the base 11 to a top end of the ring-shaped flange 133.
- the first concentrating flux plate 30 includes a first central through hole 31, and the column 13 passes through the first central through hole 31, so that the first concentrating flux plate 30 is disposed on the ring-shaped magnet 20.
- the isolating ring 70 may be an aluminum ring.
- the protruding portion 131 passes through the centre hole of the isolating ring 70, so that the isolating ring 70 is disposed in the ring-shaped groove 135.
- the second concentrating flux plate 40 includes a second central through hole 41, where the second central through hole 41 and the first central through hole 31 also have a same central axis A.
- the protruding portion 131 passes through the second central through hole 41 and abuts against the isolating ring 70. That is, the second concentrating flux plate 40 is sleeved on the column 13 above the isolating ring 70. In other words, the second concentrating flux plate 40 is not directly placed on the yoke 10.
- the first concentrating flux plate 30 has a diameter greater than that of the second concentrating flux plate 40, the second concentrating flux plate 40 is located in a position surrounded by the first central through hole 31 of the first concentrating flux plate 30, and the first concentrating flux plate 30 and the second concentrating flux plate 40 are arranged in a form of a concentric circle.
- first magnetic gap 431 between the second concentrating flux plate 40 and the first concentrating flux plate 30, and there is a second magnetic gap 433 between the second concentrating flux plate 40 and the protruding portion 131.
- the height of the isolating ring 70 is higher than that of the ring-shaped flange 133, so that there is a separating part 137 between the second concentrating flux plate 40 and the ring-shaped flange 133.
- the first concentrating flux plate 30 and the second concentrating flux plate 40 are substantially located at a same height, when viewed along the axis A.
- the first voice coil 61 is located in the first magnetic gap 431, and the second voice coil 63 is located in the second magnetic gap 433.
- the first voice coil 61 and the second voice coil 63 may be fixed by using a holder and can be connected to a diaphragm, so that when the first voice coil 61 and the second voice coil 63 receive signals, the first voice coil 61 and the second voice coil 63 interact with a magnetic force of the ring-shaped magnet 20, to drive the diaphragm vibrating and make a sound.
- the radius of the first voice coil 61 is greater than that of the second voice coil 63.
- the first voice coil 61 may be a bass voice coil, which generates a low frequency sound when driving the diaphragm to vibrate.
- the second voice coil 63 may be a treble voice coil, which generates a high frequency sound when driving the diaphragm to vibrate.
- the first voice coil 61 and the second voice coil 63 may each be connected to a diaphragm, or may be connected to a same diaphragm.
- the first voice coil 61 is connected to an outer edge area of the diaphragm (not shown), and the second voice coil 63 is connected to a central area of the diaphragm. Although a channel is not shown in the yoke 10 in FIG. 1 . Referring to FIG.
- the column 13 may further include two channels 138 through which leading lines (not shown) of the voice coils can pass, so that impact caused by a touch of other components to the voice coils is avoided.
- the channels 138 can further improve heat dissipation effects.
- the radius of the ring-shaped magnet 20 may be adjusted, and intensity of magnetic lines in the first magnetic gap 431, the second magnetic gap 433, or the separating part 137 between the second concentrating flux plate 40 and the ring-shaped flange 133 may be further adjusted.
- a buffer material such as sound-absorbing cotton may further be filled in the separating space 35, to avoid impact caused by vibration of the coaxial dual voice coil speaker 1.
- the base 11 of the yoke 10 has a thickness gradually decreasing from an area close to the protruding portion 13 to a periphery.
- the shape of the base 11 is not limited in this application, and may also be adjusted in combination with the shape of an overall horn cavity.
- the first concentrating flux plate 30 has a thickness gradually decreasing from an area close to the first central through hole 31 to a periphery. In this way, the first concentrating flux plate 30 and the base 11 of the yoke 10 may present a vertically symmetrical change in thicknesses, so that the overall structure is dish-shaped, and the overall size is further reduced.
- FIG. 4 is a diagram of distribution of magnetic lines of a coaxial dual voice coil speaker.
- the magnetic lines may be radiated out from one end (a top end) of the ring-shaped magnet 20 to the other end (a bottom end), pass through the base 11 of the yoke 10 and reach the column 13 of the yoke 10, and then go back to the ring-shaped magnet 20 (a top end) sequentially through the second magnetic gap 433, the second concentrating flux plate 40, the first magnetic gap 431, and the first concentrating flux plate 30.
- most magnetic lines are radiated out from the protruding portion 131 of the yoke 10 passing through the second magnetic gap 433 (i.e.
- the magnetic lines go back to the ring-shaped magnet 20 from the first concentrating flux plate 30.
- the second magnetic gap 433 is located between the protruding portion 131 and the second concentrating flux plate 40, and the first magnetic gap 431 is located between the first concentrating flux plate 30 and the second concentrating flux plate 40.
- the widths of the first magnetic gap 431 and the second magnetic gap 433 are adjustable, the density of the magnetic lines between the first magnetic gap 431 and the second magnetic gap 433 can be adjusted, so that an interaction effect between a magnetic force generated by the ring-shaped magnet 20, and the first voice coil 61 and the second voice coil 63 after a signal is received is indirectly adjusted, and a frequency response of the coaxial dual voice coil speaker 1 is further adjustable.
- the second concentrating flux plate 40 further includes a step portion 45.
- the step portion 45 is neighboring to the second central through hole 41, and the step portion 45 close to the first magnetic gap 431 is relatively higher than at the second magnetic gap 433. Based on this structure, the magnetic lines can better centrally enter the second magnetic gap 433.
- some magnetic lines pass by entering the first magnetic gap 431 through the ring-shaped flange 133 of the yoke 10 and the separating part 137, and then going back to the ring-shaped magnet 20 through the concentrating flux plate 30.
- the density of the magnetic lines in the first magnetic gap 431 may be increased by using the ring-shaped flange 133, so that an interaction effect of a magnetic force after the first voice coil 61 receives a signal is enhanced, and a relatively large bass resonance effect is achieved.
- the isolating ring 70 is made of a nonpermeable material and is, for example, an aluminum ring. Because the isolating ring 70 is made of a high magnetoresistant nonpermeable material, only a few magnetic lines pass through the isolating ring 70. In one embodiment, the width of the isolating ring 70 is greater than the width of the ring-shaped flange 133. Therefore, the density of magnetic lines passing through the second magnetic gap 433 may be adjusted by adjusting the width of the ring-shaped flange 133, the height and the width of the isolating ring 70, and the width or the height of the separating part 137.
- a density ratio of magnetic lines between the first magnetic gap 431 and the second magnetic gap 433 can be adjusted by adjusting a distance between the first concentrating flux plate 30 and the second concentrating flux plate 40, a distance between the protruding portion 131 and the second concentrating flux plate 40, and the widths and heights of the ring-shaped flange 133 and the isolating ring 70, and a required frequency response can further satisfied according to customized requirements.
- the coaxial dual voice coil speaker 1 can be driven independently in high frequency and low frequency bands by using the first voice coil 61 and the second voice coil 63, and achieve a better sound parsing effect in the high frequency and low frequency parts.
- the coaxial dual voice coil speaker 1 can further achieve an effect of light weight, simple structure, and rapidness in assembling by reducing overall components by using a design in which the yoke 10 is shared.
- the density of magnetic lines can be adjusted by adjusting a distance between the first concentrating flux plate 30 and the second concentrating flux plate 40, a distance between the protruding portion 131 and the second concentrating flux plate 40, and the widths and heights of the ring-shaped flange 133 and the isolating ring 70, and a required frequency response can further be satisfied according to customized requirements.
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Abstract
Description
- The present invention relates to the electroacoustic field, and in particular, to the electroacoustic field of coaxial dual voice coil speakers.
- When an electrical signal passes through a voice coil it induces a magnetic field and interacts with a magnetic field of a permanent magnet to drive a diaphragm to vibrate air, a moving-coil speaker having the permanent magnet and the diaphragm implements electroacoustic conversion. In the prior art, the moving-coil speaker generally has a single diaphragm and a single voice coil, that is, in all audio sections, electroacoustic conversion is implemented through vibration of the single diaphragm.
- However, the single diaphragm is not easy to balance a low frequency and a high frequency at the same time, and generally cannot satisfy a frequency range of 20 Hz to 20 kHz that is audible to human ears. Therefore, a design in which bass and treble are separate is used, and respective bands are separately replayed. A coaxial speaker means that a bass speaker and a treble speaker are placed at the same axis, and because the two speakers are located at the same axis and their physical positions are close to a point source, sound field positioning of replayed music is very ideal, and sound resolution is high.
- In addition, generally, when treble and bass voice coils are disposed, the speaker drives the two voice coils respectively by using two magnetic circuit systems. Therefore, the volume is greater than that of the one magnetic circuit of the single voice coil, and more magnets are required.
- To improve the prior art described above, a coaxial dual voice coil speaker is provided herein. The coaxial dual voice coil speaker includes a yoke, a ring-shaped magnet, a first concentrating flux plate, a second concentrating flux plate, a first voice coil, a second voice coil, and an isolating ring.
- The yoke may include a base and a column, where the column extends from one end of the base, and one end of the column away from the base has a protruding portion and a ring-shaped flange. The ring-shaped flange and the protruding portion are located in a same plane of the column, the ring-shaped flange surrounds the protruding portion, and there is a ring-shaped groove between the ring-shaped flange and the protruding portion. The ring-shaped magnet includes a first central axial hole, where the column passes through the first central axial hole, so that the ring-shaped magnet is sleeved on the yoke and comes into contact with the base.
- The first concentrating flux plate includes a first central through hole, where the column passes through the first central through hole, so that the first concentrating flux plate is disposed on the ring-shaped magnet. The protruding portion passes through the isolating ring, so that the isolating ring is disposed in the ring-shaped groove. The second concentrating flux plate includes a second central through hole, where the second central through hole and the first central through hole have a same central axis. The protruding portion passes through the second central through hole, so that the second concentrating flux plate is disposed on the isolating ring. There is a first magnetic gap between the second concentrating flux plate and the first concentrating flux plate, and there is a second magnetic gap between the second concentrating flux plate and the protruding portion.
- The first voice coil is located in the first magnetic gap. The second voice coil is located in the second magnetic gap.
- In some embodiments, the isolating ring is an aluminum ring. The height of the isolating ring is higher than that of the ring-shaped flange, the height of the protruding portion is higher than that of the ring-shaped flange, and there is a separating part between the second concentrating flux plate and the ring-shaped flange.
- In some embodiments, the first concentrating flux plate and the second concentrating flux plate are substantially located at a same horizontal height.
- In some embodiments, there is a separating space between the ring-shaped magnet and the column.
- In some embodiments, the base of the yoke has a thickness gradually decreasing from an area close to the protruding portion to a periphery.
- In some embodiments, the first concentrating flux plate has a thickness gradually decreasing from an area close to the first central through hole to a periphery.
- In some embodiments, the second concentrating flux plate further includes a step portion, and the step portion is neighboring to the second central through hole.
- In some embodiments, the first voice coil is a bass voice coil, and the second voice coil is a treble voice coil.
- In some embodiments, the width of the isolating ring is greater than the width of the ring-shaped flange.
- In some embodiments, the height of the ring-shaped magnet is substantially equal to the height from the base to a top end of the ring-shaped flange.
- In this case, the coaxial dual voice coil speaker can independently perform driving in high frequency and low frequency bands by using the first voice coil and the second voice coil, achieve a better sound parsing effect in the high frequency and low frequency parts, and can further achieve an effect of light weight, simple structure, and rapidness in assembling by reducing overall components by using a design in which the yoke is shared. In addition, the density of magnetic lines can be adjusted by adjusting a distance between the first concentrating flux plate and the second concentrating flux plate, a distance between the second concentrating flux plate and the protruding portion, and the widths and heights of the ring-shaped flange and the isolating ring, and a required frequency response is satisfied.
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FIG. 1 is a partially three-dimensional exploded view of a coaxial dual voice coil speaker; -
FIG. 2 is a partially cross-sectional view of a coaxial dual voice coil speaker; -
FIG. 3 is an enlarged diagram of an area B inFIG. 2 ; and -
FIG. 4 is a diagram of distribution of magnetic lines of a coaxial dual voice coil speaker. - The following describes preferred implementations of the present invention with reference to the accompanying drawings. A person skilled in the art should understand that, the implementations are merely used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.
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FIG. 1 is a partially three-dimensional exploded view of a coaxial dual voice coil speaker; andFIG. 2 is a partially cross-sectional view of a coaxial dual voice coil speaker.FIG. 3 is an enlarged diagram of an area B inFIG. 2 . As shown inFIG. 1 to FIG. 3 , the coaxial dual voice coil speaker 1 includes ayoke 10, a ring-shaped magnet 20, a first concentratingflux plate 30, a second concentratingflux plate 40, afirst voice coil 61, asecond voice coil 63, and anisolating ring 70. Theyoke 10, the ring-shaped magnet 20, the first concentratingflux plate 30, the secondconcentrating flux plate 40, thefirst voice coil 61, thesecond voice coil 63, and theisolating ring 70 have a same central axis A, and are coaxially disposed. - The first concentrating
flux plate 30 and/or the second concentratingflux plate 40 may be made of a magnetic material, which has high magnetic saturation, large magnetic permeability, and low coercivity. Further, the concentrating flux plates may be made of soft magnetic material that has a narrow hysteresis curve and rapidly magnetization and demagnetization. - The magnetic reluctance of the magnetic material of each of the the
concentrating flux plates flux plates - For example, the concentrating
flux plates concentrating flux plates - The
yoke 10 is a T-shaped yoke, including abase 11 and acolumn 13. Thecolumn 13 extends upward from one end of thebase 11, and the other end of thecolumn 13 away from thebase 11 has aprotruding portion 131 and a ring-shaped flange 133. In other words, thebase 11 of theyoke 10 may be plate-shaped, hemispherical, or dish-shaped, and has acolumn 13 protruding from a center thereof. The ring-shaped flange 133 is located at a periphery of theprotruding portion 131 and surrounds theprotruding portion 131. There is a ring-shaped groove 135 between the ring-shaped flange 133 and theprotruding portion 131. Viewed from a cross section ofFIG. 2 , theoverall yoke 10 is substantially an inverted T-shaped. - The ring-
shaped magnet 20 includes a first centralaxial hole 21. Thecolumn 13 passes through the first centralaxial hole 21, so that the ring-shaped magnet 20 is sleeved on theyoke 10. The ring-shaped magnet 20 comes into contact with thebase 11 of theyoke 10. In this case, the height of the ring-shaped magnet 20 is substantially equal to the height from thebase 11 to a top end of the ring-shaped flange 133. The first concentratingflux plate 30 includes a first central throughhole 31, and thecolumn 13 passes through the first central throughhole 31, so that the first concentratingflux plate 30 is disposed on the ring-shapedmagnet 20. - The isolating
ring 70 may be an aluminum ring. The protrudingportion 131 passes through the centre hole of the isolatingring 70, so that the isolatingring 70 is disposed in the ring-shapedgroove 135. The second concentratingflux plate 40 includes a second central throughhole 41, where the second central throughhole 41 and the first central throughhole 31 also have a same central axis A. The protrudingportion 131 passes through the second central throughhole 41 and abuts against the isolatingring 70. That is, the second concentratingflux plate 40 is sleeved on thecolumn 13 above the isolatingring 70. In other words, the second concentratingflux plate 40 is not directly placed on theyoke 10. The first concentratingflux plate 30 has a diameter greater than that of the second concentratingflux plate 40, the second concentratingflux plate 40 is located in a position surrounded by the first central throughhole 31 of the first concentratingflux plate 30, and the first concentratingflux plate 30 and the second concentratingflux plate 40 are arranged in a form of a concentric circle. - With reference to
FIG. 3 : there is a firstmagnetic gap 431 between the second concentratingflux plate 40 and the first concentratingflux plate 30, and there is a secondmagnetic gap 433 between the second concentratingflux plate 40 and the protrudingportion 131. The height of the isolatingring 70 is higher than that of the ring-shapedflange 133, so that there is a separatingpart 137 between the second concentratingflux plate 40 and the ring-shapedflange 133. Further, the first concentratingflux plate 30 and the second concentratingflux plate 40 are substantially located at a same height, when viewed along the axis A. - The
first voice coil 61 is located in the firstmagnetic gap 431, and thesecond voice coil 63 is located in the secondmagnetic gap 433. In one embodiment, although not shown in the figure, a person of ordinary skill in the art may understand that, thefirst voice coil 61 and thesecond voice coil 63 may be fixed by using a holder and can be connected to a diaphragm, so that when thefirst voice coil 61 and thesecond voice coil 63 receive signals, thefirst voice coil 61 and thesecond voice coil 63 interact with a magnetic force of the ring-shapedmagnet 20, to drive the diaphragm vibrating and make a sound. In one embodiment, the radius of thefirst voice coil 61 is greater than that of thesecond voice coil 63. Thefirst voice coil 61 may be a bass voice coil, which generates a low frequency sound when driving the diaphragm to vibrate. Thesecond voice coil 63 may be a treble voice coil, which generates a high frequency sound when driving the diaphragm to vibrate. Thefirst voice coil 61 and thesecond voice coil 63 may each be connected to a diaphragm, or may be connected to a same diaphragm. Thefirst voice coil 61 is connected to an outer edge area of the diaphragm (not shown), and thesecond voice coil 63 is connected to a central area of the diaphragm. Although a channel is not shown in theyoke 10 inFIG. 1 . Referring toFIG. 2 , thecolumn 13 may further include twochannels 138 through which leading lines (not shown) of the voice coils can pass, so that impact caused by a touch of other components to the voice coils is avoided. In addition, thechannels 138 can further improve heat dissipation effects. - Further, referring to
FIG. 2 again, in some embodiments, there is a separatingspace 35 between the ring-shapedmagnet 20 and thecolumn 13. In one embodiment, the radius of the ring-shapedmagnet 20 may be adjusted, and intensity of magnetic lines in the firstmagnetic gap 431, the secondmagnetic gap 433, or the separatingpart 137 between the second concentratingflux plate 40 and the ring-shapedflange 133 may be further adjusted. In addition, a buffer material such as sound-absorbing cotton may further be filled in the separatingspace 35, to avoid impact caused by vibration of the coaxial dual voice coil speaker 1. - Further, referring to
FIG. 2 again, in some embodiments, thebase 11 of theyoke 10 has a thickness gradually decreasing from an area close to the protrudingportion 13 to a periphery. The shape of thebase 11 is not limited in this application, and may also be adjusted in combination with the shape of an overall horn cavity. - In addition, in some embodiments, the first concentrating
flux plate 30 has a thickness gradually decreasing from an area close to the first central throughhole 31 to a periphery. In this way, the first concentratingflux plate 30 and thebase 11 of theyoke 10 may present a vertically symmetrical change in thicknesses, so that the overall structure is dish-shaped, and the overall size is further reduced. -
FIG. 4 is a diagram of distribution of magnetic lines of a coaxial dual voice coil speaker. As shown inFIG. 4 , the magnetic lines may be radiated out from one end (a top end) of the ring-shapedmagnet 20 to the other end (a bottom end), pass through thebase 11 of theyoke 10 and reach thecolumn 13 of theyoke 10, and then go back to the ring-shaped magnet 20 (a top end) sequentially through the secondmagnetic gap 433, the second concentratingflux plate 40, the firstmagnetic gap 431, and the first concentratingflux plate 30. In one embodiment, most magnetic lines are radiated out from the protrudingportion 131 of theyoke 10 passing through the second magnetic gap 433 (i.e. corresponding to a high frequency gap of the first voice coil 63), and after entering the second concentratingflux plate 40 , then come to the first magnetic gap 431 (that is, corresponding to a low frequency of the first voice coil 61). Finally, the magnetic lines go back to the ring-shapedmagnet 20 from the first concentratingflux plate 30. In one embodiment, the secondmagnetic gap 433 is located between the protrudingportion 131 and the second concentratingflux plate 40, and the firstmagnetic gap 431 is located between the first concentratingflux plate 30 and the second concentratingflux plate 40. Therefore, provided that the widths of the firstmagnetic gap 431 and the secondmagnetic gap 433 are adjustable, the density of the magnetic lines between the firstmagnetic gap 431 and the secondmagnetic gap 433 can be adjusted, so that an interaction effect between a magnetic force generated by the ring-shapedmagnet 20, and thefirst voice coil 61 and thesecond voice coil 63 after a signal is received is indirectly adjusted, and a frequency response of the coaxial dual voice coil speaker 1 is further adjustable. - In addition, referring to
FIG. 2 andFIG. 3 again, in some embodiments, the second concentratingflux plate 40 further includes astep portion 45. Thestep portion 45 is neighboring to the second central throughhole 41, and thestep portion 45 close to the firstmagnetic gap 431 is relatively higher than at the secondmagnetic gap 433. Based on this structure, the magnetic lines can better centrally enter the secondmagnetic gap 433. - In addition, as shown in
FIG. 4 , of magnetic lines radiated out by one end of the ring-shapedmagnet 20, some magnetic lines pass by entering the firstmagnetic gap 431 through the ring-shapedflange 133 of theyoke 10 and the separatingpart 137, and then going back to the ring-shapedmagnet 20 through the concentratingflux plate 30. The density of the magnetic lines in the firstmagnetic gap 431 may be increased by using the ring-shapedflange 133, so that an interaction effect of a magnetic force after thefirst voice coil 61 receives a signal is enhanced, and a relatively large bass resonance effect is achieved. - In this case, the isolating
ring 70 is made of a nonpermeable material and is, for example, an aluminum ring. Because the isolatingring 70 is made of a high magnetoresistant nonpermeable material, only a few magnetic lines pass through the isolatingring 70. In one embodiment, the width of the isolatingring 70 is greater than the width of the ring-shapedflange 133. Therefore, the density of magnetic lines passing through the secondmagnetic gap 433 may be adjusted by adjusting the width of the ring-shapedflange 133, the height and the width of the isolatingring 70, and the width or the height of the separatingpart 137. Therefore, a density ratio of magnetic lines between the firstmagnetic gap 431 and the secondmagnetic gap 433 can be adjusted by adjusting a distance between the first concentratingflux plate 30 and the second concentratingflux plate 40, a distance between the protrudingportion 131 and the second concentratingflux plate 40, and the widths and heights of the ring-shapedflange 133 and the isolatingring 70, and a required frequency response can further satisfied according to customized requirements. - In short, the coaxial dual voice coil speaker 1 can be driven independently in high frequency and low frequency bands by using the
first voice coil 61 and thesecond voice coil 63, and achieve a better sound parsing effect in the high frequency and low frequency parts. In addition, the coaxial dual voice coil speaker 1 can further achieve an effect of light weight, simple structure, and rapidness in assembling by reducing overall components by using a design in which theyoke 10 is shared. Further, the density of magnetic lines can be adjusted by adjusting a distance between the first concentratingflux plate 30 and the second concentratingflux plate 40, a distance between the protrudingportion 131 and the second concentratingflux plate 40, and the widths and heights of the ring-shapedflange 133 and the isolatingring 70, and a required frequency response can further be satisfied according to customized requirements. - Hitherto, the technical solution of the present invention is already described with reference to the preferred implementations shown in the accompanying drawings. However, a person skilled in the art may easily understand that the protection scope of the present invention is not limited to the specific implementations. A person skilled in the art may make equivalent modifications and replacements to related technical features without departing from the principle of the present invention, and a technical solution obtained after the modifications and replacements shall fall within the protection scope of the present invention.
Claims (14)
- A speaker comprising:a yoke comprising a base and a column, wherein the column extends from one end of the base, the other end of the column away from the base has a protruding portion and a ring-shaped flange, the ring-shaped flange surrounds the protruding portion, and a ring-shaped groove is located between the ring-shaped flange and the protruding portion;a ring-shaped magnet comprising a first central axial hole, wherein the column passes through the first central axial hole, so that the ring-shaped magnet is sleeved on the yoke;a first flux plate comprising a first central through hole, wherein the column passes through the first central through hole, so that the first flux plate is disposed on the ring-shaped magnet;an isolating ring, wherein the protruding portion passes through the isolating ring, so that the isolating ring is disposed in the ring-shaped groove;a second flux plate comprising a second central through hole, wherein the second central through hole and the first central through hole have a same central axis, the protruding portion passes through the second central through hole, the second concentrating flux plate is disposed on the isolating ring, a first magnetic gap is located between the second flux plate and the first flux plate, and a second magnetic gap is located between the second flux plate and the protruding portion;a first voice coil located in the first magnetic gap; anda second voice coil located in the second magnetic gap.
- The speaker according to claim 1, wherein
the isolating ring is an aluminum ring, the height of the isolating ring is higher than that of the ring-shaped flange, the height of the protruding portion is higher than that of the ring-shaped flange, and a separating part is located between the second flux plate and the ring-shaped flange. - The speaker according to either of claim 1 or claim 2, wherein
the first flux plate and the second flux plate are substantially located at a same horizontal height. - The speaker according to any one of the previous claims, wherein
the diameter of the first central axial hole is greater than the diameter of the column, so that a separating space is formed between the ring-shaped magnet and the column. - The speaker according to any one of the previous claims, wherein
the base has a thickness gradually decreasing from an area close to the protruding portion to a periphery. - The speaker according to any one of the previous claims, wherein
the first flux plate has a thickness gradually decreasing from an area close to the first central through hole to a periphery. - The speaker according to any one of the previous claims, wherein
the second flux plate further comprises a step portion, and the step portion is neighboring to the second central through hole. - The speaker according to any one of the previous claims, wherein
the first voice coil is a bass voice coil, and the second voice coil is a treble voice coil. - The speaker according to any one of the previous claims, wherein
the width of the isolating ring is greater than the width of the ring-shaped flange. - The speaker according to any one of the previous claims, wherein
the height of the ring-shaped magnet is substantially equal to the height from the base to a top end of the ring-shaped flange. - The speaker according to any one of the previous claims, wherein the speaker is a coaxial dual voice coil speaker.
- The speaker according to any one of the previous claims, wherein the first and second flux plates are each concentrating flux plates
- The speaker according to any one of the previous claims, wherein the first and second flux plates comprise a magnetic material, which has high magnetic saturation, large magnetic permeability, and low coercivity.
- The speaker according to any one of the previous claims, wherein the first and second flux plates are made of soft magnetic material that has a narrow hysteresis curve and has rapid magnetization and demagnetization, for example low-carbon steel.
Applications Claiming Priority (1)
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US201762550362P | 2017-08-25 | 2017-08-25 |
Publications (2)
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EP3448061A1 true EP3448061A1 (en) | 2019-02-27 |
EP3448061B1 EP3448061B1 (en) | 2019-11-13 |
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Family Applications (1)
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EP18190740.3A Active EP3448061B1 (en) | 2017-08-25 | 2018-08-24 | Coaxial dual voice coil speaker |
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CN (2) | CN208754543U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024000693A1 (en) * | 2022-06-30 | 2024-01-04 | 瑞声光电科技(常州)有限公司 | Coaxial loudspeaker |
WO2024045278A1 (en) * | 2022-08-30 | 2024-03-07 | 瑞声光电科技(常州)有限公司 | Coaxial loudspeaker |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN208754543U (en) * | 2017-08-25 | 2019-04-16 | 惠州迪芬尼声学科技股份有限公司 | Coaxial double-coil loudspeaker |
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US20140286524A1 (en) * | 2013-03-25 | 2014-09-25 | Tannoy Limited | Loud speakers |
CN105848064A (en) * | 2016-05-10 | 2016-08-10 | 青岛歌尔声学科技有限公司 | Dual-magnetic-gap magnetic path system and loudspeaker with same |
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CN1121809C (en) * | 1999-04-09 | 2003-09-17 | 张凡 | Loudspeaker |
CN201657285U (en) * | 2010-01-11 | 2010-11-24 | 瑞声声学科技(深圳)有限公司 | Miniature double-magnetic-steel and double-voice-coil electromagnetic loudspeaker |
US9154883B2 (en) * | 2011-09-06 | 2015-10-06 | Apple Inc. | Low rise speaker assembly having a dual voice coil driver |
HU230260B1 (en) * | 2012-09-17 | 2015-11-30 | NOVINEX Innováció- és Kutatás-hasznosító Iroda Kft. | Coaxial loudspeker arrangemet |
CN103281655A (en) * | 2013-04-16 | 2013-09-04 | 沙文金 | Double-voice coil moving-coil loudspeaker |
US9100733B2 (en) * | 2013-06-05 | 2015-08-04 | Harman International Industries, Inc. | Multi-way coaxial loudspeaker with internal magnet motor and permanent magnet cylinder |
US9173035B2 (en) * | 2013-11-07 | 2015-10-27 | Harman International Industries, Incorporated | Dual coil moving magnet transducer |
CN208754543U (en) * | 2017-08-25 | 2019-04-16 | 惠州迪芬尼声学科技股份有限公司 | Coaxial double-coil loudspeaker |
-
2018
- 2018-08-24 CN CN201821382532.6U patent/CN208754543U/en not_active Withdrawn - After Issue
- 2018-08-24 CN CN201810971987.XA patent/CN109429151B/en active Active
- 2018-08-24 EP EP18190740.3A patent/EP3448061B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20140286524A1 (en) * | 2013-03-25 | 2014-09-25 | Tannoy Limited | Loud speakers |
CN105848064A (en) * | 2016-05-10 | 2016-08-10 | 青岛歌尔声学科技有限公司 | Dual-magnetic-gap magnetic path system and loudspeaker with same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024000693A1 (en) * | 2022-06-30 | 2024-01-04 | 瑞声光电科技(常州)有限公司 | Coaxial loudspeaker |
WO2024045278A1 (en) * | 2022-08-30 | 2024-03-07 | 瑞声光电科技(常州)有限公司 | Coaxial loudspeaker |
Also Published As
Publication number | Publication date |
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EP3448061B1 (en) | 2019-11-13 |
CN109429151A (en) | 2019-03-05 |
CN109429151B (en) | 2023-12-01 |
CN208754543U (en) | 2019-04-16 |
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