WO2014180015A1 - 平板式低音扬声器 - Google Patents

平板式低音扬声器 Download PDF

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Publication number
WO2014180015A1
WO2014180015A1 PCT/CN2013/076556 CN2013076556W WO2014180015A1 WO 2014180015 A1 WO2014180015 A1 WO 2014180015A1 CN 2013076556 W CN2013076556 W CN 2013076556W WO 2014180015 A1 WO2014180015 A1 WO 2014180015A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
voice coil
woofer
flat
housing
Prior art date
Application number
PCT/CN2013/076556
Other languages
English (en)
French (fr)
Inventor
江超
杨健斌
李志�
焦其金
Original Assignee
歌尔声学股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201310167142.2A external-priority patent/CN103281656B/zh
Priority claimed from CN201320245270XU external-priority patent/CN203301727U/zh
Application filed by 歌尔声学股份有限公司 filed Critical 歌尔声学股份有限公司
Priority to US14/889,703 priority Critical patent/US9788121B2/en
Priority to KR1020157034779A priority patent/KR101707083B1/ko
Publication of WO2014180015A1 publication Critical patent/WO2014180015A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2803—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • 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
    • H04R9/041—Centering
    • 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

Definitions

  • the present invention relates to the field of electroacoustic technology, and more particularly to a flat type woofer. Background technique
  • the woofer of the conventional structure usually adopts a cone-shaped diaphragm, the center of the cone diaphragm contains a voice coil, and the magnetic circuit system is relatively large and thick.
  • the subwoofer of this structure has a large thickness, which cannot meet the demand for the increasingly thinner electronic products, and is not practical.
  • the woofer usually has a larger aperture in order to ensure its low-frequency sound, that is, a larger diaphragm area. If a flat diaphragm is used, combined with a voice coil structure (the voice coil needs to be located near the edge), the large diaphragm requires a larger voice coil size, which is difficult to twist and easier to deform.
  • the existing woofer has a relatively large magnet size, and the thinning application requires a small thickness of the washer and the basin, the magnetic circuit system is easily saturated, the performance of the magnet is excessive, waste is caused, and the cost is high.
  • an object of the present invention is to provide a flat-type woofer for realizing a reduction in the thickness of a subwoofer and solving the problem of a thick voice coil and an excessive performance of a magnet.
  • the present invention provides a flat-type woofer comprising a flat diaphragm, at least three mutually independent drive units, and a housing fixedly coupled to the diaphragm and the drive unit; wherein the drive unit includes a voice coil unit and the voice coil unit Corresponding magnetic circuit unit, voice coil unit is fixedly coupled to the diaphragm a side close to the outer casing; a mounting hole for receiving the fixed magnetic circuit unit and an acoustic hole communicating with the outside through the outer casing; and the number and position of the mounting hole and the top of the ball attached to the diaphragm The number and position of the voice coil correspond; the ratio of the total area of the sound hole to the area of the orthographic projection of the diaphragm on the casing is in the range of less than 0.9.
  • the diaphragm has a rectangular structure including a rigid ball top at a center position and a loop portion at an edge position; the voice coil unit is fixedly coupled to the ball top.
  • the outer casing includes a mounting plane and an annular side wall disposed around the mounting plane; the mounting hole and the sound hole are disposed on the mounting plane; and the upper side of the annular side wall is coupled to the loop portion of the diaphragm.
  • the driving unit is four or six, wherein a voice coil unit is respectively combined at four corner positions of the top of the ball; and, the total area of the sound hole and the orthographic projection area of the diaphragm to the outer casing The ratio is in the range of 0.2 to 0.6.
  • the sound hole includes a central sound hole disposed at a center position of the mounting plane and an edge sound hole disposed at an edge of the mounting plane; and, the area of the center sound hole is larger than the area of the edge sound hole .
  • a preferred solution further includes electrically connecting the internal circuit of the woofer and the external circuit.
  • the FPCB connector wherein, when the driving unit is four, the FPCB connector is T-shaped, and is clamped and fixed on the mounting plane at the edge of the center sound hole, and a part of the FPCB connector is on the side of the mounting plane close to the diaphragm. The other part is on the side of the mounting plane away from the diaphragm;
  • the FPCB connector is strip-shaped, the middle portion of the FPCB connector is combined with the side of the diaphragm on which the voice coil is disposed, and the two ends of the FPCB connector extend through the edge sound hole to the mounting plane away from each other.
  • the center sound hole is circular or square, disposed between every four adjacent mounting holes; the edge sound holes are elongated, and are respectively disposed between the four sides of the annular side wall and the mounting hole.
  • the folded portion is made of PU or silicone rubber; and the outer casing is made of an aluminum alloy material.
  • an extension portion is further provided around the annular side wall, and a fixing hole for fixing the speaker is evenly disposed on the extension portion.
  • the voice coil unit includes a centering piece, a voice coil skeleton, and a voice coil; A limiting portion defining a centering piece is disposed on an upper surface of the mounted plane.
  • At least three drive units using a small-sized voice coil unit and magnetic circuit unit to drive the diaphragm of a large-sized woofer, can reduce the thickness of the woofer, save the size of the magnet, reduce the cost, and improve the sensitivity of the speaker. And the structure of the driving unit disposed at the corner portion is advantageous for the balanced diaphragm of the driving woofer;
  • the outer casing is made of aluminum alloy material, and the aluminum alloy material has relatively high strength and high stability;
  • FIG. 1 is a schematic structural view of four driving units of a flat type woofer according to a first embodiment of the present invention
  • Fig. 2 is a schematic view showing the structure of six driving units of a flat type woofer according to a second embodiment of the present invention.
  • FIG. 3 is a schematic structural view of a driving unit according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing four driving units of a flat type woofer according to a first embodiment of the present invention
  • 5 is a cross-sectional view of another perspective of a woofer according to a first embodiment of the present invention
  • FIG. 6 is a reverse side view of a casing and a driving unit of four drive units of a flat-type woofer according to a first embodiment of the present invention
  • FIG. 7 is a view showing an application state of a flat type woofer according to a first embodiment of the present invention.
  • the reference numerals include: ball top 1, folding ring 2, outer casing 3, mounting hole 4, drive unit 5, FPCB connector 6, central sound hole 7, edge sound hole 8, mounting plane 9, ring side
  • the wall 10 the voice coil 11, the voice coil bobbin 12, the centering piece 13, the washer 14, the magnet 15, the T-iron 16, the magnetic gap 17, the diaphragm 18, and the rear sound chamber 19.
  • the woofer requires a large diaphragm area.
  • the present invention makes the vibration from the viewpoint of dispersing a plurality of independent driving units.
  • the film is driven by a plurality of independent voice coils, and each voice coil corresponds to a separate magnetic circuit unit, so that the woofer is thinned by driving the unit layout structure more reasonably and efficiently.
  • the flat woofer provided by the invention comprises a flat diaphragm, at least three mutually independent driving units and an outer casing made of an aluminum alloy material, and the outer casing is used for fixing the combined diaphragm and the driving unit. Further, mutually independent drive units are dispersedly arranged to drive the diaphragm in a balanced manner to balance the vibration of the diaphragm.
  • the diaphragm is a wide-caliber structure, that is, the area of the diaphragm is large to ensure the low-frequency sound effect of the product.
  • the diaphragm is a rectangular structure, but is not limited to such a structure, as a circular shape may be employed.
  • the diaphragm includes a rigid ball top at a central position and a folded portion at an edge position, and the ball top and the loop portion may be fixedly joined by bonding or the like.
  • the drive unit includes a voice coil unit and a magnetic circuit unit corresponding to the voice coil unit. The voice coil unit is attached to the top of the ball of the diaphragm.
  • the outer casing comprises a mounting plane and an annular side wall disposed around the mounting plane, and a mounting hole for receiving the fixed magnetic circuit unit and an sounding hole penetrating the mounting plane, the annular side wall are arranged on the mounting plane
  • the upper side is fixedly coupled to the folded portion of the diaphragm; wherein the number and position of the mounting holes correspond to the number and position of the voice coils attached to the top of the ball of the diaphragm.
  • the voice coil unit is electrically connected to an external circuit through an FPCB connector, that is, the FPCB connector is used to electrically connect the internal circuit and the external circuit of the woofer.
  • FIG. 1 is a block diagram showing the construction of four driving units of a flat type woofer according to a first embodiment of the present invention.
  • the flat type woofer of the first embodiment includes a diaphragm, four driving units 5, and a casing 3.
  • the diaphragm includes a rigid ball top 1 at a center position and a loop portion 2 at an edge position, and the drive unit 5 includes a voice coil unit and a magnetic circuit unit, and each voice coil unit corresponds to each magnetic circuit unit.
  • the outer casing 3 includes a mounting plane 9 at a central position and an annular side wall 10 disposed around the mounting plane, the upper side of the annular side wall 10 being coupled to the flap portion 2 of the diaphragm.
  • a fixing hole (not shown in Fig. 1) may be provided at the edge of the annular side wall for the fixed combination of the flat woofer and the electronic device.
  • the fixing hole may be disposed on a side of the annular side wall away from the diaphragm, or a ring extension may be added around the annular side wall, and the fixing hole is evenly disposed on the extending portion.
  • Mounting holes 4 corresponding to the number and position of the driving units and sounding holes penetrating the mounting plane are provided on the mounting plane 9, and the mounting holes 4 are for accommodating the voice coil unit and mounting the fixed magnetic circuit unit.
  • a stopper defining a position of the centering piece is provided in the mounting hole 4 of the mounting plane 9.
  • Mounting holes 4 can be used to mount a fixed magnetic circuit unit.
  • the sound hole includes a central sound hole 7 and an edge sound hole 8, and the center sound hole 7 is disposed at a center position of the mounting plane 9, corresponding to the diaphragm intermediate portion, and the edge sound hole 8 is disposed at the edge of the mounting plane 9.
  • the position that is, between the annular side wall 10 and the mounting hole 4, is provided on the edge parallel to the center sound hole 7 with respect to the entire mounting plane.
  • the airflow on both sides of the casing 3 can be smoothly circulated, and the size of the center sound hole is larger than the size of the edge sound hole.
  • the sound hole should be set away from the mounting hole 4 and kept at a certain distance to ensure the strength of the outer casing 3.
  • the ratio of the total area of the sound hole to the orthographic area of the diaphragm on the outer casing is in a range of less than 0.9 to improve the smoothness of the airflow and improve the acoustic performance of the woofer.
  • the area of the diaphragm that is orthographically projected on the housing is the orthographic area of the diaphragm that is perpendicular to its direction of vibration. This structure ensures the smooth flow of the airflow and ensures the strength and heat dissipation of the outer casing.
  • a central sound hole 7 is provided at a position corresponding to the portion on the mounting plane 9, and the center is out.
  • the sound hole 7 is large in size for more airflow to flow in or out therefrom.
  • edge sound hole 7 is elongated and disposed in parallel with the center sound hole 8 on the mounting plane.
  • edge sound holes can also be designed to be circular or other irregular shapes depending on the needs of the speaker application.
  • the upper side of the annular side wall 10 is fixedly connected to the folded portion 2 of the diaphragm.
  • the four driving units 5 shown in the embodiment of Fig. 1 are electrically connected by an FPCB connector 6.
  • the FPCB connector 6 is T-shaped, and the mounting plane 9 is clamped and fixed to the edge of the center sound hole 7. on.
  • a plurality of pads (not shown in Fig. 1) are provided on the FPCB connector 6, and the pads are connected to the voice coil and the external circuit.
  • the FPCB connector 6 Since the FPCB connector 6 is clamped and fixed on the mounting plane, a part of the FPCB connector is on the side close to the diaphragm on the mounting plane 9, and the other portion is on the side of the mounting plane 9 away from the diaphragm.
  • the drive unit 5 and the FPCB connector 6 are electrically connected to the side close to the diaphragm.
  • the flat-type woofer can also be six driving units.
  • FIG. 2 is a schematic structural view of six driving units of a flat-type woofer according to an embodiment of the present invention.
  • the flat-type woofer as shown in FIG. 2 includes a diaphragm and six independent units.
  • the flat-type woofer includes six driving units, four of which are respectively disposed at four corners of the top of the ball of the diaphragm, and the other two voice coil units are respectively disposed at the four corners of the voice coil unit.
  • the formed one or two sets of opposite sides are equally spaced from the two voice coils on the side to form a larger driving force for acting on a more powerful electronic device.
  • the outer casing 3 includes a mounting plane 9 and an annular side wall 10 around the mounting plane.
  • a fixing hole (not shown in FIG. 2) is further disposed on the edge of the annular side wall, and the fixing hole is used for fixing the flat woofer to the electronic device. .
  • Mounting holes 4 corresponding to the number and position of the driving units and sounding holes penetrating the mounting plane are provided on the mounting plane 9, and the mounting holes 4 can be used to accommodate the voice coil unit and mount the fixed magnetic circuit unit.
  • the sound hole includes two circular center sound holes 7 and four strip edge sound holes 8, and the center sound hole 7 is disposed between each of the adjacent four mounting holes 4, and four of the edge sounding holes 8 are respectively disposed between the four sides of the annular side wall and the mounting hole 4.
  • the edge sound hole 7 is elongated and the center sound hole 8 is circular.
  • the edge sound holes can also be designed to be circular or other irregular shapes depending on the needs of the speaker application.
  • the upper side of the annular side wall 10 is fixedly connected to the folded portion 2 of the diaphragm.
  • the drive unit 5 is electrically connected by an FPCB connector 6, which is provided with a plurality of pads (not shown in Fig. 2) which are connected to the voice coil and an external circuit.
  • the FPCB connector 6 is combined with the diaphragm and is on the same side as the voice coil of the drive unit 5; the pad of the FPCB connector 6 is electrically connected to the lead of the voice coil; the end of the FPCB connector 6 extends from the sound hole to the installation
  • the plane 9 is away from the side of the diaphragm.
  • the FPCB connector 6 is strip-shaped, and the middle portion of the FPCB connector is coupled to the side of the diaphragm on which the voice coil is disposed, and the two ends of the FPCB connector Extend through the edge sound hole to the side of the mounting plane away from the diaphragm.
  • the coils can be flexibly connected in series, parallel or series-parallel by using the circuit between the solder joints.
  • a fixing hole is provided at the thin edge of the outer casing 3, and the fixing hole 11 is used for fixing the woofer to the electronic device.
  • the ball top 1 of the diaphragm is a rigid structure which enhances the acoustic properties of the diaphragm.
  • the ball top 1 of the diaphragm may also be a relatively lightweight and rigid material such as a honeycomb structure or a foam structure, and the two structures can also enhance the acoustic characteristics of the diaphragm.
  • the folded portion 2 of the diaphragm is made of a soft material such as PU or silicone rubber with respect to the top portion of the ball 1, so that the diaphragm can freely vibrate up and down.
  • the diaphragm has a rectangular structure and may be rectangular or square. However, in a specific application process, the diaphragm is not limited to a rectangular shape, and may also be a circular shape.
  • the number of the driving units corresponding to the diaphragm of the circular structure is at least three, and between any two adjacent driving units and the center of the circle
  • the angle of the angle is 120 degrees, and the number of driving units corresponding to the circular diaphragm can also be more, which will not be described in detail herein.
  • the FPCB connector is used to electrically connect the driving unit and the external circuit, and the FPCB connector can simplify the manufacturing process compared to the conventional wire connection method. , saves the internal space of the speaker, and can High speaker stability.
  • a plurality of pads and a circuit connecting the pads are disposed on the surface of the FPCB connector.
  • the voice coil and the pad on the side of the FPCB connector near the diaphragm are electrically connected by spot welding or the like. In the connection process, the coils can be flexibly connected in series, parallel or series-parallel by using the circuit between the solder joints.
  • the electronic device (such as a liquid crystal television) is electrically connected to the side of the FPCB connector that is away from the mounting plane.
  • the FPCB connector is clamped to the mounting plane at the edge of the center sound hole, and can also make full use of the limited space inside the speaker.
  • the four or six drive units are respectively disposed on the diaphragm corresponding to the edge of the top 1 of the ball, which facilitates a stable coupling of the voice coil of the drive unit 5 with the diaphragm, preferably at the top 1 of the ball.
  • Four corner positions allow the diaphragm to drive in a balanced manner.
  • This structure uses a small-sized voice coil unit and magnetic circuit unit to drive the diaphragm of a large-sized woofer, which can reduce the thickness of the woofer, save the size of the magnet, reduce the cost, and improve the sensitivity of the woofer.
  • the plurality of driving units act on the diaphragm and have a uniform driving force, and can ensure a sufficiently large driving power on the basis of reducing the volume of the driving unit, thereby making the product thinner, and the performance enables the flat woofer of the present invention.
  • high-power electronic devices such as LCD TVs.
  • the driving unit includes a voice coil unit and a magnetic circuit unit.
  • the voice coil unit includes a voice coil 11, a voice coil bobbin 12, a centering support piece 13, and a magnetic circuit unit including a washer 14, a magnet 15, and a T-iron 16.
  • the top of the voice coil 11 is fixed in combination with the diaphragm 18, and the voice coil bobbin 12 is used to support the voice coil 11, so that the voice coil 11 is in a proper position in the magnetic gap 17.
  • the centering piece 13 is used to fix the voice coil 11, preventing the voice coil 11 from being polarized in the horizontal direction.
  • the voice coil unit is vibrated in the magnetic circuit system, and the common vibration of the plurality of voice coil units drives the vibration of the large-diameter diaphragm to emit sound.
  • the drive units independent of each other have the same size and performance, but are not limited to this configuration.
  • the structure of a large diaphragm that drives a woofer with a plurality of small driving units can effectively reduce the thickness of the woofer and adapt to the trend of thinning of current electronic products, making the woofer of this structure more practical.
  • the driving unit in the embodiment shown in Figs. 3 and 4 has a circular structure, which is designed to make the force of the diaphragm 18 more uniform than the rectangular structure voice coil.
  • Huasi 14 and T iron 16 are both guides A magnetic structure for correcting magnetic lines of force; a magnetic gap 17 formed between the magnet 15 and the T-iron 16 for accommodating the voice coil 11.
  • FIG. 5 is a cross-sectional view of the woofer according to the first embodiment of the woofer at another angle (perpendicular to the direction in which the sound hole extends).
  • the center sound hole 7 and the edge sound hole 8 are both elongated structures.
  • the aperture of the central sound hole 7 is larger than the aperture of the edge sound hole 8, and the area of the diaphragm corresponding to the center sound hole 7 is also larger than the area of the diaphragm corresponding to the edge sound hole 8.
  • This structure of the sound hole ensures that the air current generated by the vibration of the diaphragm is transmitted to the outside through the sound hole in time to ensure the acoustic performance of the product.
  • the ratio of the total area of the sound hole to the area of the orthographic projection of the diaphragm on the outer casing is less than 0.9, which improves the smoothness of the airflow and improves the acoustic performance of the woofer.
  • the area of the diaphragm that is orthographically projected on the outer casing is the orthographic projection area of the diaphragm perpendicular to its vibration direction.
  • the area of the sound hole is relatively large.
  • the ratio of the total area of the sound hole to the orthographic area of the diaphragm on the outer casing is 0.2 to 0.6.
  • the ratio of the total area of the sound holes to the area of the orthographic projection of the diaphragm on the casing is in the range of 0.1 to 0.4. This structure ensures the smooth flow of airflow and ensures the strength and heat dissipation of the casing.
  • Figure 6 is a reverse side view of the outer casing and drive unit of four drive units of a flat-type woofer according to an embodiment of the present invention.
  • the outer casing 3 includes a mounting plane and an annular side wall, and four mounting holes 4 and sounding holes for accommodating the driving unit are arranged on the mounting plane; wherein the outer casing 3 is made of an aluminum alloy material, and the aluminum alloy material has relatively high strength. , high stability.
  • the sound hole includes a center sound hole 7 and an edge sound hole 8.
  • the center sound hole 7 is disposed at a position corresponding to the intermediate portion of the installation plane and the diaphragm.
  • the center sound hole 7 and the center sound hole 7 is large in size for more airflow to flow in or out therefrom.
  • the edge sound hole 8 is disposed at the edge position of the mounting plane corresponding to the center sound hole 7.
  • the FPCB connector 6 is used for electrical connection between the driving unit and the external circuit, and the FPCB connector 6 used in the present invention has a rigid structure and has strong elasticity compared with the existing plastic structure. Prone to breakage.
  • fixing holes are provided at the four corners of the outer casing 3 for fixing the woofer and the electronic device.
  • FIG. 7 is a diagram showing an application state of a flat-type woofer according to an embodiment of the present invention.
  • the intermediate portion of the FPCB connector 6 is coupled to the side on which the voice coil is disposed on the diaphragm, in the speaker product, the intermediate portion of the FPCB connector 6 is located on the side of the mounting plane adjacent to the diaphragm. Both ends of the FPCB connector 6 extend from the sound hole to the side of the mounting plane 9 away from the diaphragm.
  • the sound hole on the mounting plane allows the space on the rear side of the diaphragm 18 to communicate with the entire rear sound chamber 19, and a sound absorbing material or a gas adsorbing material can be added to the rear sound chamber 19.
  • the sound absorbing material can adjust the sound curve and adjust the sound performance; the gas adsorbing material can adsorb the gas, adjust the air pressure of the sound chamber 19, thereby increasing the equivalent volume of the rear sound chamber 19, and improving the low frequency sound effect of the product.
  • the flat-type woofer provided by the present invention is disposed at the top of the ball of the diaphragm by using at least three driving units, and the structure uses a small-sized voice coil and magnetic circuit system to drive the large-sized woofer.
  • the diaphragm can reduce the thickness of the woofer, save the size of the magnet and reduce the cost, and improve the sensitivity of the speaker; at least three driving units act on the diaphragm, the driving force is uniform, and the driving power is ensured to be large enough, and the product is thin; The top of the diaphragm produces more airflow. The large sound hole facilitates the circulation of the airflow and increases the driving force of the speaker.
  • the outer casing is made of aluminum alloy. The strength of the aluminum alloy is relatively high and the stability is high. Circles and external circuits save space.
  • a flat type subwoofer according to the present invention has been described by way of example with reference to the accompanying drawings. However, it will be understood by those skilled in the art that various improvements can be made to the flat-panel woofer proposed by the present invention without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the content of the appended claims.

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

Abstract

本发明提供一种平板式低音扬声器，包括平板状的振膜、至少三个相互独立的驱动单元和外壳；驱动单元包括音圈单元和与音圈单元相对应的磁路单元；音圈单元分散地结合固定在振膜靠近外壳的一侧；在外壳上设置有用于收容固定磁路单元的安装孔以及贯通外壳的与外界连通的出声孔；安装孔的数量和位置与贴合在振膜的球顶部的音圈的数量和位置相对应；出声孔总面积与振膜在外壳上正投影面积的比值在小于0.9的数值范围内。本发明提供的平板式低音扬声器，能够解决音圈厚重和磁铁性能过剩的问题。

Description

平板式低音扬声器
技术领域
本发明涉及电声技术领域， 更为具体地， 涉及一种平板式低音扬声器。 背景技术
随着社会的进步和技术的发展， 近年来， 电视机等电子产品体积不断减 小日趋薄型化， 人们对这些电子产品的性能要求也越来越高， 从而也要求与 之配套的电子零件的体积不断厚度也在减小、 性能和一致性不断提高。
传统结构的低音扬声器通常采用锥形纸盆状的振膜， 锥形振膜的中心位 置包含一个音圈， 而且磁路系统的尺寸比较大也比较厚。 这种结构的低音扬 声器， 产品的厚度较大， 无法满足目前电子产品日趋薄型化的需求， 实用性 不强。
并且， 低音扬声器为了保证其低频声效通常具有更大的口径， 即具有更 大的振膜面积。 若采用一个平板状振膜， 结合有一个音圈的结构 （音圈需要 位于靠近边缘的位置）， 大面积的振膜要求音圈尺寸也要比较大， 绕制困难， 较易变形。 另外， 现有的低音扬声器的磁铁尺寸比较大， 薄型化应用时要求 华司和盆架厚度都较小， 磁路系统容易饱和， 磁铁性能过剩， 造成浪费， 而 且成本较高。
基于以上因素， 需要对这种传统结构的低音扬声器产品进行改进， 以避 免上述缺陷。 发明内容 鉴于上述问题， 本发明的目的是提供一种平板式低音扬声器， 以实现低 音扬声器的薄型化， 并且解决音圈厚重和磁铁性能过剩的问题。
本发明提供一种平板式低音扬声器， 包括平板状的振膜、 至少三个相互 独立的驱动单元以及固定结合振膜和驱动单元的外壳； 其中， 驱动单元包括 音圈单元和与音圈单元相对应的磁路单元， 音圈单元分散地结合固定在振膜 靠近外壳的一侧； 在外壳上设置有用于收容固定磁路单元的安装孔以及贯通 外壳的与外界连通的出声孔； 并且， 安装孔的数量和位置与贴合在振膜的球 顶部的音圈的数量和位置相对应； 出声孔总面积与振膜在外壳上正投影面积 的比值在小于 0.9的数值范围内。
此外， 优选的方案是， 振膜为矩形结构， 包括位于中心位置的刚性的球 顶部和位于边缘位置的折环部； 音圈单元与球顶部固定结合。
此外， 优选的方案是， 外壳包括安装平面和环绕安装平面设置的环形侧 壁； 安装孔和出声孔设置在安装平面上； 环形侧壁的上侧面与振膜的折环部 结合。 此外， 优选的方案是， 驱动单元为四个或者六个， 其中， 在球顶部的四 个角部位置分别结合有一个音圈单元； 并且， 出声孔总面积与振膜向外壳正 投影面积的比值在 0.2至 0.6的数值范围内。
此外， 优选的方案是， 出声孔包括设置在安装平面中心位置的中心出声 孔和设置在安装平面边缘位置的边缘出声孔； 并且， 中心出声孔的面积大于 边缘出声孔的面积。
此外， 优选的方案是， 还包括电连接低音扬声器内部电路和外部电路的
FPCB连接件， 其中， 在驱动单元为四个时， FPCB连接件为 T型， 夹持固定 在中心出声孔边缘的安装平面上， FPCB连接件的一部分处于安装平面靠近振 膜的一侧， 另一部分处于安装平面远离振膜的一侧；
在驱动单元为六个时， FPCB连接件为条形， FPCB连接件的中部结合在 振膜上设置有音圈的一侧， FPCB连接件的两端部通过边缘出声孔延伸至安装 平面远离所述振膜的一侧。
此外， 优选的方案是， 在驱动单元为六个时，
中心出声孔为圆形或者方形， 设置在的每四个相邻安装孔之间； 边缘出声孔为长条形， 分别设置在环形侧壁四边和安装孔之间。
此外， 优选的方案是， 折环部采用 PU或硅橡胶制作； 所述外壳采用铝合 金材料。
此外， 优选的方案是， 在环形侧壁周边还具有延伸部， 在延伸部上均匀 设置有固定扬声器的固定孔。
此外， 优选的方案是， 音圈单元包括定心支片、 音圈骨架和音圈； 在所安装平面的上表面设置有限定定心支片的限位部。 从上面的技术方案可知， 本发明的平板式低音扬声器， 能够取得以下有 益效果：
1 ) 至少三个驱动单元， 采用小尺寸的音圈单元和磁路单元驱动大尺寸的 低音扬声器的振膜， 能够减少低音扬声器的厚度， 还能够节省磁铁的尺寸降 低成本， 提高扬声器的灵敏度， 并且这种驱动单元设置于角部的结构有利于 平衡的驱动低音扬声器的振膜；
2) 由于振膜中心部分产生的气流较多， 出声孔总面积与振膜在外壳上正 投影面积的比值在小于 0.9的数值范围内，这种该结构有利于气流流通的顺畅 性， 能够提高声学性能；
3 ) 外壳采用铝合金材料， 铝合金材料强度比较大， 稳定性高；
4) 采用 FPCB (Flexible Printed Circuit Board, 简称 FPCB或 FPC， 挠性 印刷电路板） 连接音圈和外电路， 能够节省空间。 为了实现上述以及相关目的， 本发明的一个或多个方面包括后面将详细 说明并在权利要求中特别指出的特征。 下面的说明以及附图详细说明了本发 明的某些示例性方面。 然而， 这些方面指示的仅仅是可使用本发明的原理的 各种方式中的一些方式。 此外， 本发明旨在包括所有这些方面以及它们的等 同物。 附图说明
通过参考以下结合附图的说明及权利要求书的内容， 并且随着对本发明 的更全面理解， 本发明的其它目的及结果将更加明白及易于理解。 在附图中： 图 1 为根据本发明实施例一的平板式低音扬声器四个驱动单元的结构示 意图；
图 2为根据本发明实施例二的平板式低音扬声器六个驱动单元结构示意 图。
图 3为根据本发明实施例的驱动单元结构示意图；
图 4为根据本发明实施例一的平板式低音扬声器四个驱动单元剖视图； 图 5为根据本发明实施例一的低音扬声器另一角度的剖视图； 图 6为根据本发明实施例一的平板式低音扬声器四个驱动单元的外壳和 驱动单元的反面视图；
图 7为根据本发明实施例一的平板式低音扬声器应用状态图。
其中的附图标记包括： 球顶部 1、 折环部 2、 外壳 3、 安装孔 4、 驱动单 元 5、 FPCB连接件 6、 中心出声孔 7、 边缘出声孔 8、 安装平面 9、 环形侧壁 10、 音圈 11、 音圈骨架 12、 定心支片 13、 华司 14、 磁铁 15、 T铁 16、 磁间 隙 17、 振膜 18、 后声腔 19。
在所有附图中相同的标号指示相似或相应的特征或功能。 具体实施方式
在下面的描述中， 出于说明的目的， 为了提供对一个或多个实施例的全 面理解， 阐述了许多具体细节。 然而， 很明显， 也可以在没有这些具体细节 的情况下实现这些实施例。 以下将结合附图对本发明的具体实施例进行详细 描述。
低音扬声器需要较大的振膜面积， 为了在限制音圈和磁铁尺寸的基础上 给大面积的振膜提供足够的驱动， 本发明从分散布置多个相互独立的驱动单 元的角度出发， 使得振膜由多个独立的音圈驱动， 每个音圈对应独立的磁路 单元， 从而以更合理有效地驱动单元布设结构实现低音扬声器的薄型化。
本发明提供的平板式低音扬声器， 包括平板状的振膜、 至少三个相互独 立的驱动单元和采用铝合金材料制作的外壳， 外壳用于固定结合振膜和驱动 单元。 并且， 相互独立的驱动单元分散设置以平衡地驱动振膜使振膜能够平 衡的振动。
其中， 振膜为宽口径的结构， 即振膜的面积较大以保证产品的低频声效。 在以下具体实施例的示例性说明中， 振膜为矩形结构， 但不限于这种结构， 如可以采用圆形。 振膜包括位于中心位置的刚性的球顶部和位于边缘位置的 折环部， 球顶部和折环部可以采用粘接等方式固定结合。 驱动单元包括音圈 单元和与音圈单元相对应的磁路单元。 音圈单元贴合固定在振膜的球顶部。
外壳包括安装平面和设置在安装平面周围的环形侧壁， 在安装平面上设 置有用于收容固定磁路单元的安装孔以及贯通安装平面的出声孔， 环形侧壁 的上侧面与振膜的折环部固定连接； 其中， 安装孔的数量和位置与贴合在振 膜的球顶部的音圈的数量和位置相对应。
音圈单元通过 FPCB连接件与外部电路电连接， 也就是说， FPCB连接件 用于电连通低音扬声器的内部电路和外部电路。
图 1 为根据本发明实施例一的平板式低音扬声器四个驱动单元的结构示 意图。 如图 1 所示， 本实施例一的平板式低音扬声器包括振膜、 四个驱动单 元 5和外壳 3。
振膜包括位于中心位置的刚性的球顶部 1和位于边缘位置的折环部 2，驱 动单元 5包括音圈单元和磁路单元， 每个音圈单元与每个磁路单元分别相对 应。 外壳 3包括位于中心位置的安装平面 9和环绕设置在安装平面周围的环 形侧壁 10， 环形侧壁 10的上侧面与振膜的折环部 2结合。 在
另外， 还可以在环形侧壁的边缘设置固定孔 （未在图 1中标出）， 以便平 板式低音扬声器与电子装置的固定结合。 该固定孔可以设置在环形侧壁上远 离振膜的一侧， 也可以在环形侧壁周边增加一圈延伸部， 固定孔均匀设置在 该延伸部上。
在图 1 所示的平板式低音扬声器中， 包含四个驱动单元， 分别结合在振 膜的球顶部 1的四个角部。
在安装平面 9上设置有与驱动单元数目和位置对应的安装孔 4以及贯通 安装平面的出声孔， 安装孔 4用于容纳音圈单元并且安装固定磁路单元。 在 安装平面 9的安装孔 4中设置有限定定心支片位置的限位部。 安装孔 4可用 于安装固定磁路单元。
出声孔包括中心出声孔 7和边缘出声孔 8，中心出声孔 7设置在安装平面 9的中心位置， 与振膜中间区域相对应， 边缘出声孔 8设置在安装平面 9的边 缘位置， 即环形侧壁 10和安装孔 4之间， 相对于整个安装平面而言， 边缘出 声孔 8设置在与中心出声孔 7平行的边缘上。 为了保证振膜中心位置的产生 的气流多于振膜边缘位置产生的气流， 从而使外壳 3 两侧的气流可以顺畅的 流通， 中心出声孔的尺寸要大于边缘出声孔的尺寸。 另外， 出声孔应避开安 装孔 4设置， 并且保持一定间距， 以保证外壳 3的强度。
另外，出声孔总面积与振膜在外壳上正投影面积的比值在小于 0.9的数值 范围内， 以提升气流流通的顺畅性， 提高这种低音扬声器的声学性能。 其中， 振膜在外壳上正投影的面积即振膜在垂直于其振动方向上的正投影面积。 这 种结构可以确保气流流通的顺畅性， 并且可以保证外壳的强度和散热等性能。
对于长方形的振膜， 振膜中间的区域比较大， 该部分振膜的产生的气流 也较多， 因此， 在安装平面 9上对应于该部分的位置设有中心出声孔 7， 而且 中心出声孔 7的尺寸较大， 以供较多的气流从此处流入或流出。
在图 1所示的实施例中， 边缘出声孔 7为长条形， 和中心出声孔 8平行 设置在安装平面上。 当然， 也可以根据扬声器应用的需求将边缘出声孔设计 为圆形或者其他不规则形状。
环形侧壁 10的上侧面与振膜的折环部 2固定连接。
图 1实施例中所示的四个驱动单元 5采用 FPCB连接件 6进行电连接， 在本实施例中， FPCB连接件 6为 T形， 夹持固定在中心出声孔 7边缘的安装 平面 9上。 在 FPCB连接件 6上面设置有多个焊盘 （在图 1未标出）， 焊盘与 音圈和外部电路相连接。
由于 FPCB连接件 6是夹持固定在安装平面上的， 因此， FPCB连接件的 一部分处于在安装平面 9靠近振膜的一侧， 另一部分处于安装平面 9远离振 膜的一侧。 驱动单元 5与 FPCB连接件 6在靠近振膜的一侧电连接。
平板式低音扬声器也可以为六个驱动单元， 图 2为根据本发明实施例的 平板式低音扬声器六个驱动单元结构示意图， 如图 2所示的平板式低音扬声 器包括振膜、 六个相互独立的驱动单元 5和外壳 3。
该平板式低音扬声器中包含六个驱动单元， 将其中四个驱动单元分别设 置在振膜的球顶部的四个角部， 另外两个音圈单元分别设置在四个角部的音 圈单元所形成的一组或者两组对边上， 并且与所在边的两个音圈等间距排布， 形成更大的驱动力， 以作用于功率更大的电子装置。
外壳 3包括安装平面 9和安装平面周围的环形侧壁 10， 在环形侧壁的边 缘上还设置有固定孔（未在图 2中标出）， 固定孔用于平板式低音扬声器与电 子装置固定结合。 在图 2所示的实施方式中， 在环形侧壁周边具有延伸部， 在该延伸部上均匀设置有固定扬声器的固定孔。
在安装平面 9上设置有与驱动单元数目和位置对应的安装孔 4以及贯通 安装平面的出声孔， 安装孔 4可用于容纳音圈单元并且安装固定磁路单元。 出声孔包括两个圆形的中心出声孔 7和四个条形的边缘出声孔 8，中心出声孔 7设置在相邻的每四个安装孔 4之间， 边缘出声孔 8为四个， 分别设置在环形 侧壁四边和安装孔 4之间。 在图 2所示的实施例中， 边缘出声孔 7为长条形， 中心出声孔 8为圆形。 当然， 也可以根据扬声器应用的需求将边缘出声孔设 计为圆形或者其他不规则形状。
环形侧壁 10的上侧面与振膜的折环部 2固定连接。驱动单元 5采用 FPCB 连接件 6进行电连接， FPCB连接件 6设置有多个焊盘 （在图 2未标出）， 焊 盘与音圈和外部电路相连接。
FPCB 连接件 6与振膜结合， 并与驱动单元 5的音圈位于同侧； FPCB连 接件 6的焊盘与音圈的引线电连接； FPCB连接件 6的端部从出声孔延伸至安 装平面 9远离振膜的一侧。
在图 2的实施例二中， 对于六个驱动单元的结构， FPCB连接件 6为条 形， FPCB连接件的中部结合在振膜上设置有音圈的一侧， FPCB连接件的两 端部通过边缘出声孔延伸至安装平面远离振膜的一侧。 在连接过程中， 利用 焊点之间的电路， 音圈之间可以以串联、 并联或者串并联结合的方式灵活连 接。
此外， 在外壳 3薄边缘还设置有固定孔， 固定孔 11用于低音扬声器与电 子装置固定。
在图 1和图 2的实施例中， 振膜的球顶部 1为刚性结构， 刚性结构能够 提升振膜声学特性。 在本发明的实施中， 振膜的球顶部 1 也可以为蜂窝结构 或者发泡体结构等质量比较轻而且刚性比较好的材料， 这两种结构也能够提 升振膜声学特性。振膜的折环部 2采用 PU或硅橡胶等相对于球顶部 1较软的 材料制作， 使振膜能够自由的上下振动。
在图 1和图 2的实施例中， 振膜为矩形结构， 可以为长方形， 也可以为 正方形。 但是， 在具体的应用过程中， 振膜不限于矩形， 也可以为圆形， 圆 形结构的振膜对应的驱动单元的数量至少为三个， 任一相邻的两驱动单元与 圆心之间的夹角均为 120度， 圆形振膜对应的驱动单元的数量也可以为更多 个， 在此不再详述。
由于本发明采用的驱动单元较多， 因此， 在发明的实施例中， 采用 FPCB 连接件进行电连接驱动单元和外部电路， 相比较于普通的导线连接方式， 采 用 FPCB 连接件能够使制造工艺简化， 节省扬声器的内部空间， 并且能够提 高扬声器的稳定性。
对于多个驱动单元的结构， 为了使 FPCB 连接件即能够便于与外壳固定 结合， 又能够方便地连接多个音圈， 在 FPCB 连接件的表面设置有多个焊盘 和连接这些焊盘的电路， 音圈与 FPCB 连接件上靠近振膜一侧的焊盘通过点 焊等方式电连接。 在连接过程中， 利用焊点之间的电路， 音圈之间可以以串 联、并联或者串并联结合的方式灵活连接。电子装置（如液晶电视机）与 FPCB 连接件远离安装平面的一侧电连接， FPCB连接件夹持固定于中心出声孔边缘 的安装平面上， 也能够充分利用扬声器内部有限的空间。
四个或者六个驱动单元中的四个分别设置在振膜上对应于的球顶部 1 边 缘的位置， 有利于驱动单元 5 的音圈与振膜稳定的结合， 优选地， 位于球顶 部 1 的四个角部位置， 使振膜能够平衡的驱动。 这种结构采用小尺寸的音圈 单元和磁路单元驱动大尺寸的低音扬声器的振膜， 能够减少低音扬声器的厚 度， 还能够节省磁铁的尺寸降低成本， 提高低音扬声器的灵敏度。 这种多个 驱动单元作用于振膜， 驱动力均匀， 能够在降低驱动单元体积的基础上保证 足够大的驱动功率， 从而使产品更加薄型化， 这种性能能够使本发明的平板 式低音扬声器用于功率较大的电子装置， 如液晶电视机等。
图 3和图 4分别为根据本发明实施例的驱动单元结构示意图和剖视图， 如图 3和图 4所示， 驱动单元包括音圈单元和磁路单元。 其中， 音圈单元包 括音圈 11、 音圈骨架 12、 定心支片 13， 磁路单元包括华司 14、 磁铁 15、 T 铁 16。
音圈 11的顶部与振膜 18结合固定， 音圈骨架 12用于支持音圈 11， 使音 圈 11在磁间隙 17中位于合适的位置。 定心支片 13用于固定音圈 11， 防止音 圈 11在水平方向发生偏振。 在接通电信号后， 音圈单元在磁路系统中受力振 动， 多个音圈单元的共同振动带动大口径振膜的振动发出声音。 在本实施例 中， 相互独立的驱动单元的大小和性能相同， 但不限于这种结构。 这种用多 个小型驱动单元驱动低音扬声器的大型振膜的结构， 可以有效降低低音扬声 器的厚度， 适应当前电子产品的薄型化发展趋势， 使这种结构的低音扬声器 实用性更强。
图 3和图 4所示的实施例中的驱动单元为圆形结构， 与长方形结构音圈 相比这种结构设计能够使振膜 18的受力更加均匀。华司 14和 T铁 16均为导 磁结构， 用于修正磁力线； 磁铁 15和 T铁 16之间形成的磁间隙 17用于容纳 音圈 11。
图 5为根据本实施例一的低音扬声器另一角度（垂直于出声孔延伸方向） 的剖视图， 再结合图 1可知， 中心出声孔 7和边缘出声孔 8均为长条形结构， 中心出声孔 7的孔径大于边缘出声孔 8的孔径， 而且中心出声孔 7对应的振 膜的面积也大于边缘出声孔 8对应的振膜面积。
出声孔的这种结构可以保证振膜振动产生的气流及时的通过出声孔传输 到外界， 以保证产品的声学性能。 出声孔总面积与振膜在外壳上正投影面积 的比值在小于 0.9的数值范围内， 能够提升气流流通的顺畅性， 提高这种低音 扬声器的声学性能。 其中， 振膜在外壳上正投影的面积即振膜在垂直于其振 动方向上的正投影面积。
此外， 对于实施例一中的具有四个驱动单元的低音扬声器， 出声孔的面 积比较大， 优选的， 出声孔总面积与振膜在外壳上正投影面积的比值在 0.2至 0.6的数值范围内。 对于实施例二中的具有六个驱动单元的低音扬声器， 优选 出声孔总面积与振膜在外壳上正投影面积的比值在 0.1至 0.4的数值范围内。 这种结构可以确保气流流通的顺畅性， 并且可以保证外壳的强度和散热等性 能。
图 6为根据本发明实施例的平板式低音扬声器四个驱动单元的外壳和驱 动单元的反面视图。 如图 6所示， 外壳 3包括安装平面和环形侧壁， 在安装 平面上有容纳驱动单元的四个安装孔 4和出声孔； 其中， 外壳 3采用铝合金 材料， 铝合金材料强度比较大， 稳定性高。 出声孔包括中心出声孔 7和边缘 出声孔 8。
在图 6所示的实施例中， 中心出声孔 7设置在安装平面与振膜中间区域 对应的位置。 对于长方形的振膜， 如果在边缘位置设置四个音圈， 振膜中间 的区域会比较大， 该部分振膜的产生的气流也较多， 因此， 安装平面上对应 于该部分的位置设有中心出声孔 7， 并且中心出声孔 7的尺寸较大， 以供较多 的气流从此处流入或流出。 此外， 边缘出声孔 8设置在与中心出声孔 7对应 的安装平面的边缘位置。
FPCB连接件 6用于驱动单元和外部电路的电连接，并且本发明中采用的 FPCB连接件 6为刚性结构， 与现有的塑料结构相比， 具有较强的弹性， 不容 易发生断裂。
此外在外壳 3的四个角部还设置有固定孔 （未在图 6中标出）， 用于固定 低音扬声器与电子装置。
图 7为根据本发明实施例的平板式低音扬声器应用状态图。
如图 6所示， 由于 FPCB连接件 6的中间部分结合在振膜上设置有音圈 的一侧， 因此， 在扬声器产品中， FPCB连接件 6的中间部分位于安装平面靠 近振膜的一侧， FPCB连接件 6的两端部从出声孔延伸至安装平面 9远离振膜 的一侧。 安装平面上的出声孔使振膜 18后侧的空间与整个后声腔 19连通， 在后声腔 19中可以添加吸音材料或者气体吸附材料。 吸音材料可能够调整声 学曲线， 调整声音性能； 气体吸附材料可吸附气体， 调整后声腔 19气压， 从 而提高后声腔 19的等效体积， 提升产品的低频声效。 通过上述实施方式可以看出， 本发明提供的平板式低音扬声器采用至少 三个驱动单元分散设置在振膜的球顶部， 这种结构采用小尺寸的音圈和磁路 系统驱动大尺寸的低音扬声器的振膜， 能够减少低音扬声器的厚度， 还能够 节省磁铁的尺寸降低成本， 提高扬声器的灵敏度； 至少三个驱动单元作用于 振膜， 驱动力均匀， 并且能够保证驱动功率足够大， 产品薄； 振膜的球顶部 产生的气流较多， 大的出声孔有利于气流的流通， 能够增加扬声器的驱动力； 外壳采用铝合金材料， 铝合金材料强度比较大， 稳定性高； 采用 FPCB 连接 音圈和外电路， 能够节省空间。 如上参照附图以示例的方式描述了根据本发明提出的平板式低音扬声 器。 但是， 本领域技术人员应当理解， 对于上述本发明所提出的平板式低音 扬声器， 还可以在不脱离本发明内容的基础上做出各种改进。 因此， 本发明 的保护范围应当由所附的权利要求书的内容确定。

Claims

权 利 要 求 书
1、 一种平板式低音扬声器， 包括平板状的振膜、 至少三个相互独立的驱 动单元以及固定结合所述振膜和所述驱动单元的外壳； 其中，
所述驱动单元包括音圈单元和与所述音圈单元相对应的磁路单元， 所述 音圈单元分散地结合固定在所述振膜靠近所述外壳的一侧；
在所述外壳上设置有用于收容固定所述磁路单元的安装孔以及贯通所述 外壳的与外界连通的出声孔， 并且，
所述安装孔的数量和位置与贴合在所述振膜的球顶部的音圈的数量和位 置相对应；
所述出声孔总面积与所述振膜在外壳上正投影面积的比值在小于 0.9的 数值范围内。
2、 如权利要求 1所述的平板式低音扬声器， 其中，
所述振膜为矩形结构， 包括位于中心位置的刚性的球顶部和位于边缘位 置的折环部；
所述音圈单元与所述球顶部固定结合。
3、 如权利要求 2所述的平板式低音扬声器， 其中，
所述外壳包括安装平面和环绕所述安装平面设置的环形侧壁；
所述安装孔和所述出声孔设置在所述安装平面上；
所述环形侧壁的上侧面与所述振膜的折环部结合。
4、 如权利要求 2所述的平板式低音扬声器， 其中，
所述驱动单元为四个或者六个， 其中， 在所述述球顶部的四个角部位置 分别结合有一个音圈单元； 并且，
所述出声孔总面积与所述振膜向外壳正投影面积的比值在 0.2至 0.6的数 值范围内。
5、 如权利要求 4所述的平板式低音扬声器， 其中，
所述出声孔包括设置在所述安装平面中心位置的中心出声孔和设置在所 述安装平面边缘位置的边缘出声孔； 并且，
所述中心出声孔的面积大于所述边缘出声孔的面积。
6、 如权利要求 5所述的平板式低音扬声器， 还包括电连接所述低音扬声 器的内部电路和外部电路的 FPCB连接件， 其中，
在所述驱动单元为四个时， 所述 FPCB连接件为 T型， 夹持固定在所述 中心出声孔边缘的所述安装平面上， 所述 FPCB连接件的一部分处于所述安 装平面靠近所述振膜的一侧， 另一部分处于所述安装平面远离所述振膜的一 在所述驱动单元为六个时，所述 FPCB连接件为条形，所述 FPCB连接件 的中部结合在所述振膜上设置有所述音圈的一侧， 所述 FPCB连接件的两端 部通过所述边缘出声孔延伸至所述安装平面远离所述振膜的一侧。
7、 如权利要求 5所述的平板式低音扬声器， 其中，
在所述驱动单元为六个时，
所述中心出声孔为圆形或者方形， 设置在的每四个相邻安装孔之间； 所述边缘出声孔为长条形， 分别设置在所述环形侧壁四边和所述安装孔 之间。
8、 如权利要求 1〜7中任一项所述的平板式低音扬声器， 其中， 所述折环部采用 PU或硅橡胶制作；
所述外壳采用铝合金材料。
9、 如权利要求 1〜7中任一项所述的平板式低音扬声器， 其中， 在所述环形侧壁周边还具有延伸部， 在所述延伸部上均匀设置有固定所 述扬声器的固定孔。
10、 如权利要求 1〜7中任一项所述的平板式低音扬声器， 其中， 所述音圈单元包括定心支片、 音圈骨架和音圈；
在所述安装平面的上表面设置有限定所述定心支片的限位部。
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