WO2024027152A1 - 扬声器 - Google Patents

扬声器 Download PDF

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Publication number
WO2024027152A1
WO2024027152A1 PCT/CN2023/080192 CN2023080192W WO2024027152A1 WO 2024027152 A1 WO2024027152 A1 WO 2024027152A1 CN 2023080192 W CN2023080192 W CN 2023080192W WO 2024027152 A1 WO2024027152 A1 WO 2024027152A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
sound outlet
upper wall
sound
distance
Prior art date
Application number
PCT/CN2023/080192
Other languages
English (en)
French (fr)
Inventor
朱哈·贝克曼
Original Assignee
瑞声光电科技(常州)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
Application filed by 瑞声光电科技(常州)有限公司 filed Critical 瑞声光电科技(常州)有限公司
Publication of WO2024027152A1 publication Critical patent/WO2024027152A1/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • 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
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements 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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • 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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to the field of electronic equipment, and more particularly to loudspeakers with reduced intermodulation distortion.
  • Intermodulation distortion is caused by the movement of the diaphragm in the front cavity of the speaker (a phenomenon often referred to as "piano distortion"). This distortion is caused by changes in frequency response.
  • the presence of distortion can be easily measured, for example using two-tone intermodulation distortion measurements or multi-tone distortion measurements.
  • the housing 2 has an upper wall extending parallel to the diaphragm 1 so that the cavity maintains a constant width in the direction of movement of the diaphragm 1 in its rest position.
  • the housing 2 is provided with a sound outlet 3 .
  • the sound outlet 3 and the cavity defined by the housing 2 and the diaphragm 1 constitute the front cavity of the speaker.
  • the frequency response changes are caused by the movement of diaphragm 1, which can be explained by using the corresponding equivalent circuit shown in Figure 1b.
  • the sound outlet 3 acts as an acoustic inductor and the chamber acts as an acoustic capacitor.
  • the width of the chamber changes with the movement of the diaphragm 1, causing the capacitance of the capacitor to change.
  • the sound outlet of a traditional speaker acts as an acoustic inductor, and the front cavity acts as an acoustic capacitor.
  • the capacitance and inductance cause changes in frequency response, resulting in intermodulation distortion. Anything that reduces changes in frequency response to diaphragm motion will reduce this distortion.
  • the technical problem to be solved by the present invention is to provide a speaker that reduces intermodulation distortion by minimizing changes in frequency response.
  • a speaker including:
  • Diaphragm used to vibrate to produce sound waves
  • a housing which includes an upper wall opposite to the diaphragm and a side wall connecting the upper wall and the diaphragm; the upper wall has an inner surface facing the diaphragm;
  • a sound outlet which is provided on the upper wall or the side wall and is used to output sound waves
  • the diaphragm and the outer shell together form a front sound cavity connected to the sound outlet, the front sound cavity and the sound outlet jointly form a front cavity, and the inner surface is provided with a front cavity close to the sound outlet.
  • the distance from the position of the protrusion to the diaphragm is smaller than the distance from the position of other parts of the inner surface to the diaphragm.
  • the sound outlet is provided on the side wall
  • the upper wall includes a first part and a second part respectively parallel to the axis of the sound outlet, and the first part is close to the sound outlet, The second part is farther from the sound outlet than the first part, and the distance from the diaphragm to the inner surface corresponding to the first part is greater than the distance from the diaphragm to the second part. The corresponding distance between the inner surfaces is small.
  • the plane of the inner surface corresponding to the first part is parallel to the plane of the diaphragm.
  • the upper wall further includes a third part located between the first part and the second part, and the distance from the diaphragm to the inner surface corresponding to the third part is along the distance from the diaphragm to the inner surface corresponding to the third part. The direction from the first part to the second part gradually increases.
  • the inner surface corresponding to the first part is flush with the upper edge of the sound outlet.
  • the side walls include two opposite side walls, the sound outlet is provided on one of the two opposite side walls, and the upper wall is provided with an opposite first end and a second end. end, the first end is connected to one of the two opposite side walls where the sound outlet is provided, and the second end is connected to one of the two opposite side walls.
  • the distance from the diaphragm to the inner surface of the upper wall gradually increases in the direction from the first end to the second end.
  • the sound outlet is provided on the upper wall.
  • the upper wall includes a first part surrounding the sound outlet and a second part surrounding the first part.
  • the first part is close to the outlet.
  • the sound port is arranged such that the distance from the diaphragm to the inner surface corresponding to the first part is smaller than the distance from the diaphragm to the inner surface corresponding to the second part.
  • the plane of the inner surface corresponding to the first part is parallel to the plane of the diaphragm.
  • the upper wall further includes a third part located between the first part and the second part, and the distance from the diaphragm to the inner surface corresponding to the third part is along the The direction from the first part to the second part gradually increases.
  • the sound outlet is provided on the upper wall, and the distance from the diaphragm to the inner surface of the upper wall is measured along the distance from the sound outlet to the upper wall and the side wall. The direction of the joint gradually increases.
  • the upper wall is provided with a C-shaped first part, the cross section of the first part is parallel to the plane where the diaphragm is located, the first part includes a body and a connection close to the sound outlet Two arms extending from opposite ends of the body in a direction away from the sound outlet.
  • the side walls include two opposite side walls, each of the two opposite side walls is provided with one of the sound outlets, and the upper wall is provided with an annular and cross-section parallel to the sound outlet.
  • the first part of the plane where the diaphragm is located includes two beams arranged oppositely, and the two beams are respectively arranged close to one of the sound outlets.
  • Another embodiment of the present invention also provides a speaker, including:
  • a diaphragm which is used to vibrate to generate sound waves
  • a housing which includes an upper wall opposite to the diaphragm and a side wall connecting the upper wall and the diaphragm;
  • a sound outlet which is provided on the upper wall or the side wall and is used to output sound waves
  • the diaphragm and the outer shell together form a front sound cavity connected to the sound outlet.
  • the front sound cavity and the sound outlet jointly form a front cavity.
  • the upper wall includes a plate connected to the side wall. , and a protrusion connected to the plate and extending from the plate toward the diaphragm, the protrusion being disposed close to the sound outlet.
  • the protruding part has an inner surface facing the diaphragm, the protruding part includes a first part, and the inner surface corresponding to the first part is parallel to the plane where the diaphragm is located.
  • the protruding part further includes a second part, the second part is connected to the first part and extends in a direction away from the sound outlet, from the diaphragm to the corresponding part of the second part The distance between the inner surfaces gradually increases in a direction away from the sound outlet.
  • the protrusion extends from the connection between the plate and the side wall to the periphery of the sound outlet, and the distance from the diaphragm to the inner surface is away from the outlet in the direction. It gradually increases in the direction of the vocal outlet.
  • the protruding portion is C-shaped, and the protruding portion includes a body disposed close to the sound outlet and two arms connected to opposite ends of the body and extending away from the sound outlet.
  • the side walls include two oppositely arranged side walls, and each side wall is provided with one of the sound outlets.
  • the protrusion is annular and includes two beams arranged oppositely. Each of the side walls is provided with one sound outlet. The beams are respectively arranged close to one of the sound outlets.
  • the present invention aims to reduce intermodulation distortion by minimizing changes in frequency response.
  • Disclosed embodiments of the present invention provide a speaker, including a diaphragm, a housing and a sound outlet; the diaphragm is configured to generate sound waves.
  • the shell includes an upper wall opposite to the diaphragm and a side wall connecting the upper wall and the diaphragm.
  • the upper wall has an inner surface facing the diaphragm; the sound outlet is provided on the upper wall or the side wall and is configured to output sound waves; the diaphragm Together with the shell, they form a front sound cavity connected to the sound outlet.
  • the front sound cavity and the sound outlet form the front cavity;
  • the inner surface has a protruding part located close to the sound outlet, and the distance between the protruding part and the diaphragm is Less than the distance between other parts of the inner surface and the diaphragm.
  • Figure 1a is a schematic diagram of a conventional loudspeaker provided by the prior art
  • Figure 1b is an equivalent circuit corresponding to the prior art loudspeaker of Figure 1;
  • Figure 2a is a schematic perspective view of a speaker housing according to an embodiment of the invention.
  • Figure 2b is a schematic cross-sectional side view of the embodiment according to Figure 2a;
  • Figure 2c is an equivalent circuit corresponding to the embodiment of Figure 2a;
  • Figure 3a is a non-diagrammatic cross-sectional side view of another embodiment of line I-I according to the embodiment of Figure 2a;
  • Figure 3b is a schematic cross-sectional side view of another embodiment of line I-I according to the embodiment of Figure 2a;
  • Figure 3c is a non-illustrated cross-sectional side view of another embodiment of line I-I according to the embodiment of Figure 2a;
  • Figure 3d is a schematic cross-sectional side view of another embodiment of line I-I according to the embodiment of Figure 2a, wherein the speaker includes two sound outlets;
  • Figure 3e is a non-illustrated cross-sectional side view of another embodiment of line I-I according to the embodiment of Figure 2a;
  • Figure 4a is another schematic cross-sectional side view along line III-III according to the embodiment of Figure 2a;
  • Figure 4b is another schematic cross-sectional side view along line I-I according to the embodiment of Figure 2a;
  • Figure 5a is another schematic cross-sectional view along line III-III according to the embodiment of Figure 2a;
  • Figure 5b is another schematic cross-sectional view along line I-I according to the embodiment of Figure 2a;
  • Figure 6a is another schematic cross-sectional side view along line III-III according to the embodiment of Figure 2a;
  • Figure 6b is another schematic cross-sectional side view along line I-I according to the embodiment of Figure 2a;
  • Figure 7a is a schematic perspective view of a speaker housing according to another embodiment of the present invention.
  • Figure 7b is a schematic cross-sectional side view along line I-I according to the embodiment of Figure 7a;
  • Figure 8a is a schematic cross-sectional side view of another example of line I-I according to the embodiment of Figure 7a;
  • Figure 8b is a non-illustrated cross-sectional side view of another example of line I-I according to the embodiment of Figure 7a;
  • Figure 9a is a measurement diagram of two-tone intermodulation distortion of a loudspeaker according to the present invention (right) compared with the prior art (left);
  • Figure 9b is a measurement diagram of multi-tone intermodulation distortion of a loudspeaker according to the present invention (right) compared with the prior art (left).
  • FIG. 2a is a perspective view of a speaker casing according to a first embodiment of the present invention.
  • the speaker includes a diaphragm 10 configured to generate sound waves, a sound outlet 30 configured to output sound waves, and a housing 20 .
  • the housing 20 is composed of an upper wall 21 opposite to the diaphragm 10 and a side wall 22 connecting the upper wall 21 and the diaphragm 10 .
  • the sound outlet 30 may be provided at the side wall 22 .
  • the diaphragm 10 and the upper wall 21 are spaced apart from each other and together with the side walls 22 form a front sound cavity.
  • the sound outlet 20 and the front sound cavity are connected with each other and jointly form the front cavity of the speaker.
  • the sound waves generated by the diaphragm 10 can pass through the front sound cavity and then be exported from the sound outlet 30 .
  • the upper wall 21 includes a first part 211 and a second part 212 in a direction parallel to the axis II of the sound outlet 30 .
  • the axis II of the sound outlet 30 is parallel to the plane in which the driving diaphragm 10 is in the rest position (hereinafter referred to as the "rest plane"), the first part 211 is located close to the sound outlet 30, and the second part 212 is located in the Beside part 212 and away from the sound outlet 30 .
  • the upper wall 21 includes an inner surface located in the front acoustic cavity and facing the diaphragm 10 .
  • the inner surface is divided into two areas, namely 213a and 213b, comprised in the first part 211 and the second part 212 respectively.
  • the inner surface 213a located at the first portion 211 is closer to the diaphragm 10 than the inner surface 213b located at the second portion 212. That is to say, the distance between the inner surface 213a located at the first part 211 and the diaphragm 10 is smaller than the distance between the inner surface 213b located at the second part 212 and the diaphragm 10 .
  • the rest position here refers to the position when the diaphragm 10 remains stationary relative to the upper wall and does not vibrate.
  • the embodiment of the present invention reduces the distance between the part of the inner surface of the upper wall 21 close to the sound outlet 30 and the diaphragm, thereby reducing the width of a part of the front sound cavity corresponding to the diaphragm 10, so as to effectively form the front sound cavity.
  • the variable width of the acoustic cavity as it extends towards the sound outlet 30 also makes the remaining portion of the front acoustic cavity further away from the sound outlet 30 wider, although there are still unavoidable variables.
  • the equivalent circuit corresponding to this embodiment is shown in Figure 2c. Compared with the traditional speaker, in addition to variable capacitance, a variable inductor with variable inductance value is further introduced into the circuit.
  • the result of the reduced width is that the distance between the acoustic sensors is shortened, and the reduced width changes with the movement of the diaphragm 10, thereby causing changes in inductance. That is to say, the constricted part of the front sound cavity can be used as a part of the output port of the speaker, instead of placing the output port completely outside the corresponding position of the diaphragm 10 as in the traditional design.
  • the capacitance of the front sound cavity and the inductance of its corresponding width-contracted part both change with the audio signal.
  • the combined effect of these two variable components is to reduce the overall change in the resonant frequency that causes intermodulation distortion, and the resonant frequency can remain approximately constant.
  • first side wall 22a and second side wall 22b two opposing side walls may be provided and designated first side wall 22a and second side wall 22b.
  • the sound outlet 30 may be provided at the first side wall 22a.
  • the first portion 211 may extend in a direction parallel to the axis II of the sound outlet 30 to the connection between the upper wall and the first side wall 22a. That is to say, the first portion 211 has one end connected to the first side wall 22a.
  • the inner surface 213a located at the first part 211 may extend parallel to the rest plane, so that the first part 211 forms a step relative to the second part 212. As shown in FIG. 2 b , the inner surface 213 a located at the first portion 211 is at a higher position than the upper edge of the sound outlet 30 .
  • the inner surface 213a at the first part 211 may be flush with the upper edge of the sound outlet 30, that is, the distance from the inner surface 213a at the first part 211 to the diaphragm 10 is equal to the distance from the upper edge of the sound outlet 30 distance to the diaphragm 10.
  • Figure 3a shows a schematic cross-sectional view of another embodiment, the sound outlet 30 may be disposed at the side wall 22a.
  • the first part 211 further has a groove 211a, which extends on the inner surface 213a of the first part 211 and extends according to the extension of the edge portion of the diaphragm 10 corresponding to the first part 211.
  • the inner surface 213 a located at the first portion 211 is at a higher position than the upper edge of the sound outlet 30 .
  • the inner surface 213a at the first portion 211 may be flush with the upper edge of the sound outlet 30 .
  • Figure 3b shows a non-diagrammatic cross-sectional side view of another embodiment.
  • the speaker also has a sound outlet 30 provided at the side wall 22a.
  • the upper wall 21 has two second parts 212a and 212b, and the first part 211 is sandwiched between the two second parts 212a and 212b and connected thereto respectively. That is to say, the first portion 211 in this example does not need to extend to be connected to the first side wall 22a, but one end can be extended toward the connection between the upper wall 21 and the first side wall 22a, and connected with the first side wall. 22a, with a second portion 212b connected to the first side wall 22a.
  • the second part 212b may have a much smaller width than the other second part 212a in a direction parallel to the axis II of the sound outlet 30, thereby ensuring that the first part 211 is located close to the sound outlet 30.
  • the inner surface 213 a located at the first portion 211 is at a higher position than the upper edge of the sound outlet 30 .
  • the inner surface 213a at the first portion 211 may also be flush with the upper edge of the sound outlet 30 .
  • Figure 3c shows a schematic cross-sectional side view of another embodiment.
  • the speaker also has a sound outlet 30 provided at the side wall 22a.
  • the upper wall 21 may further comprise a third portion 214 transitioning between the first portion 211 and the second portion 212.
  • the third part 214 may be a slope for use between the step surface (inner surface 213a of first part 211) and the "ground" surface (inner surface of second part 212). 213b), that is, the inner surface 213c at the third portion 214 may extend from the inner surface 213a at the first portion 211 to the inner surface 213b at the second portion 213b.
  • the distance between the inner surface 213c located at the third part 214 and the diaphragm 10 may gradually increase from the first part 211 to the second part 212.
  • the inner surface 213a of the first part 211 is flush with the upper edge of the sound outlet 30 .
  • the inner surface 213a located at the first part 211 is higher than the upper edge of the sound outlet 30 , that is, the distance from the inner surface 213 a located at the first part 211 to the diaphragm 10 is greater than the distance from the upper edge of the sound outlet 30 The distance from the edge to the diaphragm 10.
  • the speaker may be provided with two sound outlets on two opposite side walls respectively.
  • the upper portion near each sound outlet may have a structure similar to any of the above examples.
  • the upper wall may include two first parts, or two third parts, disposed on two opposite sides of the upper wall of the two sound outlets.
  • the schematic diagram in Figure 3d also shows another embodiment, in which the speaker includes two sound outlets respectively provided on the first side wall 22a and the second side wall 22b, namely the first sound outlet 30a and the second sound outlet respectively. Sound mouth 30b.
  • the upper wall 21 has a symmetrical structure in the direction from the first sound outlet 30a to the second sound outlet 30b.
  • the configuration of the upper wall 21 near the first side wall 22a is similar to the above example, and the upper wall 21 near the second side wall 22b (right side in Figure 3d) is similar to the configuration of the upper wall 21 near the first side wall 22b (right side in Figure 3d).
  • the upper wall 21 is arranged symmetrically.
  • Figure 3e shows schematically another example according to the embodiment of Figure 2a, wherein a cross-sectional side view is schematically illustrated.
  • the speaker also has a sound outlet 30 provided at the side wall 22 .
  • the distance between the inner surface 213 of the upper wall 21 and the diaphragm 10 may not be constant or increase sharply in any part.
  • the distance between the diaphragm 10 and the inner surface 213 of the upper wall 21 may gradually increase from the connection between the upper wall 21 and the first side wall 22a to the connection between the upper wall 21 and the second side wall 22b.
  • Figures 4a and 4b are schematic cross-sectional side views of another example according to line III-III and line I-I in the embodiment of Figure 2a, respectively.
  • only one sound outlet 30 is provided at the first side wall 22a
  • the upper wall 21 is provided with a C-shaped first part 211.
  • the inner surface 213a corresponding to the first part 211 is parallel to the position of the diaphragm 10. plane.
  • the C-shaped first portion 211 has a main body extending along the first side wall 22a and two arms extending from two opposite ends of the main body, and the two arms are connected to both ends of the first side wall 22a along the sides of the housing 20 Two opposite side walls extend.
  • the main body of the first part 211 is located close to the sound outlet 30 , and the two arms extend away from the sound outlet 30 .
  • the inner surface 213a located at the first portion 211 is closer to the diaphragm 10 than the inner surface 213b located at the second portion 212.
  • FIG. 5a and 5b schematically show a cross-sectional side view of another example, in which both the first side wall 22a and the second side wall 22b have a sound outlet, respectively the first sound outlet 30a and the second sound outlet. Sound outlet 30b.
  • the upper wall 21 has a symmetrical structure in the direction from the first sound outlet 30a to the second sound outlet 30b. Specifically, the configuration of the upper wall 21 close to the first side wall 22a (left side in Figures 5a and 5b) is similar to the example in Figures 4a and 4b.
  • the upper wall 21 close to the second side wall 22b (the right side in Figures 5a and 5b) is symmetrically arranged with the upper wall 21 close to the first side wall 22a.
  • the first part 211 of the upper wall 21 includes two, and the two first parts 211 are two C-shaped structures arranged symmetrically with each other.
  • the two first parts 211 are respectively located opposite the first sound outlet 30a and the second sound outlet 30a.
  • first portion 211 of the upper wall 21 is annular. That is, the cross section of the first portion 211 taken from a plane parallel to the rest plane is a closed circle.
  • the annular first portion 211 includes two pairs of opposing beams, a first pair and a second pair extending along the two sets of side walls of the housing 20 .
  • the first pair of opposing beams extend parallel to each other and are adjacent to the first side wall 22a and the second side wall 22b respectively, and the second pair of opposing beams connect the first pair of opposing beams.
  • the inner surface 213a located at the first portion 211 is closer to the diaphragm 10 than the inner surface 213b located at the second portion 212.
  • the sound outlet may be provided on the upper wall 21 of the speaker instead of the side wall 22 described in the above embodiment.
  • Figure 7b schematically shows a cross-sectional side view of an embodiment according to line I-I shown in Figure 7a.
  • the sound outlet 30 can be provided at the upper wall 21 .
  • the upper wall 21 may include a first part 211 and a second part 212 along the radial direction of the sound outlet 30 .
  • the first part 211 may be in an annular shape surrounding the sound outlet 30
  • the second part may be further configured in an annular shape surrounding the first part 211 .
  • the first part 211 can extend radially to connect the sound outlet 30 and the second part 212 respectively.
  • the inner surface 213a located at the first portion 211 is closer to the diaphragm 10 than the inner surface 213b located at the second portion 212.
  • the distance between the inner surface 213a located at the first part 211 and the diaphragm 10 is smaller than the distance between the inner surface 213b located at the second part 212 and the diaphragm 10 .
  • the inner surface 213a located at the first portion 211 is annular and extends along the circumference of the sound outlet 30, so that two shadow areas formed by two opposite sides of the sound outlet 30 are shown in the cross-sectional side view, as shown in Figure 7b shown.
  • the inner surface 213b at the second part 212 is also annular, and the inner surface 213a at the first part 211 may extend parallel to the stop plane, so that the first part 211 is relative to the second part 212 Form a circular step.
  • Figure 8a is a schematic cross-sectional side view of another example.
  • the speaker also has a sound outlet 30 disposed in the middle of the upper wall 21 .
  • the upper wall 21 may further comprise a third portion 214 transitioning between the first portion 211 and the second portion 212.
  • the inner surface 213c at the third portion 214 may extend from the inner surface 213a at the first portion 211 to the inner surface 213b at the second portion 213b, thus being annular.
  • the distance between the inner surface 213c of the third part 214 and the diaphragm 10 may gradually increase in the radial direction from the first part 211 to the second part 212.
  • Figure 8b is a schematic cross-sectional side view of another example.
  • the speaker also has a sound outlet 30 disposed in the middle of the upper wall 21 .
  • a continuity may be present for the inner surface of the upper wall from the periphery of the sound outlet 30 to the connection between the upper wall 21 and the side wall 22 gradient.
  • the distance between the diaphragm 10 and the inner surface 213 of the upper wall 21 may gradually increase from the periphery of the sound outlet 30 to the connection between the upper wall 21 and the side wall 22 .
  • the upper wall described in the above embodiments and examples thereof may be integrally formed.
  • the upper wall may be formed in two or more parts, including a plate fixed to or integrally formed with the side wall, and a protrusion attached to the surface of the plate facing the diaphragm.
  • the protrusions extend from the plate toward the diaphragm to form the above-mentioned steps and/or slopes.
  • the introduced speaker has a casing shape of a rectangular parallelepiped, it should be appreciated that the present disclosure may be applicable to speakers having other shapes, such as cylinders.
  • Figure 9a and Figure 9b respectively show that compared with the existing technology (left) according to the present invention (right), it can be seen that the intermodulation distortion of the solution of the present invention is significantly reduced.
  • Figure 9a uses a two-tone test signal
  • Figure 9b uses a multi-tone test signal. test signal.
  • the signal driving the loudspeaker in Figure 9a consists of two sinusoidal peaks at 800Hz and 5kHz.
  • the "grass"-like reduction in the right image compared to the left image indicates the distortion reduction according to the present inventive solution.
  • the same is true for the multi-tone measurement in Figure 9b.

Abstract

本发明公开了一种扬声器，包括振膜、外壳和出声口；振膜用于振动产生声波；所述外壳包括设置在所述振膜对面的上壁以及连接所述上壁与所述振膜的侧壁；所述上壁具有面向所述振膜的内表面，所述出声口设置在所述上壁或所述侧壁上，用于输出声波；所述振膜和所述外壳共同围成了与所述出声口连通的前声腔；前声腔和出声口形成前腔；所述内表面具有位于接近所述出声口处的凸出部分，所述凸出部分与所述振膜之间的距离小于所述内表面其它部分与所述振膜之间的距离。与现有技术相比，本发明的扬声器通过极小化频率响应的变化实现减少互调失真。

Description

扬声器 技术领域
本发明涉及电子设备领域，更具体地说，涉及具有减少互调失真的扬声器。
 背景技术
互调失真是由扬声器前腔内的振膜的运动引起的(这种现象通常被称为“钢琴失真”)。这种失真是由于频率响应的变化造成的。失真的存在可以很容易地测量，例如使用双音互调失真测量或多音失真测量。
在如图1a 所示的简化的传统扬声器结构中，外壳2具有与振膜1平行延伸的上壁，以使腔室在振膜1的静止位置的移动方向上保持恒定宽度。在外壳2处设有出声口3。出声口3和由外壳2和振膜1限定的腔体构成扬声器的前腔。频率响应变化是由振膜1的运动引起的，这可以通过使用图1b 所示的相应的等效电路来解释。出声口3作为一个声学电感器，而腔室作为一个声学电容器。腔室的宽度随着振膜1的运动而变化，从而导致电容器的电容变化。
 技术问题
传统扬声器的出声口作为一个声学电感器，前腔作为一个声学电容器，电容和电感引起频率响应的变化，从而导致互调失真。任何减少振膜运动频率响应变化的措施都会减少这种失真。
 技术解决方案
本发明要解决的技术问题是提供一种通过极小化频率响应的变化实现减少互调失真的扬声器。
为解决上述技术问题，本发明实施例提供了一种扬声器，包括：
振膜，用于振动产生声波;
外壳，所述外壳包括与所述振膜相对设置的上壁和连接所述上壁和所述振膜的侧壁；所述上壁具有朝向所述振膜的内表面；以及
出声口，所述出声口设置在所述上壁或所述侧壁上，用于输出声波；
所述振膜和所述外壳共同围成了与所述出声口连通的前声腔，所述前声腔和所述出声口共同形成前腔，所述内表面设有靠近所述出声口的突起部，从所述突起部的位置到所述振膜的距离小于从所述内表面的其他部分的位置到所述振膜的距离。
作为进一步改进，所述出声口设置在所述侧壁，所述上壁包括分别与所述出声口的轴线平行的第一部分和第二部分，所述第一部分靠近所述出声口，所述第二部分相较于所述第一部分远离所述出声口，从所述振膜到所述第一部分所对应的所述内表面的距离比从所述振膜到所述第二部分所对应的所述内表面的距离小。
作为进一步改进，所述第一部分所对应的所述内表面所在的平面平行于到所述振膜所在的平面。
作为进一步改进，所述上壁还包括位于所述第一部分和所述第二部分之间的第三部分，所述振膜至所述第三部分所对应的所述内表面的距离沿从所述第一部分到所述第二部分的方向逐渐增加。
作为进一步改进，所述第一部分所对应的所述内表面与所述出声口的上边缘平齐。
作为进一步改进，所述侧壁包括相对设置的两个，所述出声口设置于相对设置的两个所述侧壁中的其中一个，所述上壁设有相对的第一端和第二端，所述第一端连接于相对设置的两个所述侧壁中设置所述出声口的其中一个所述侧壁，所述第二端连接至相对设置的两个所述侧壁中的另一个所述侧壁，从所述振膜到所述上壁的所述内表面的距离沿从所述第一端到所述第二端的方向逐渐增加。
作为进一步改进，所述出声口设置在所述上壁，所述上壁包括环绕所述出声口的第一部分和环绕所述第一部分的第二部分，所述第一部靠近所述出声口设置，从所述振膜到所述第一部分所对应的所述内表面的距离小于从所述振膜到所述第二部分所对应的所述内表面的距离。
作为进一步改进，所述第一部分所对应的所述内表面所在的平面平行于所述振膜所在的平面。
作为进一步改进，所述上壁还包括位于所述第一部分和所述第二部分之间的第三部分，从所述振膜至所述第三部分所对应的所述内表面的距离沿从所述第一部分到所述第二部分的方向逐渐增加。
作为进一步改进，所述出声口设置于所述上壁，所述振膜至所述上壁的所述内表面的距离，沿从所述出声口至所述上壁与所述侧壁的连接处的方向逐渐增加。
作为进一步改进，所述上壁设有一个呈C形的第一部分，所述第一部分的横截面平行于所述振膜所在的平面，所述第一部分包括靠近所述出声口的本体和连接于所述本体相对两末端并向远离所述出声口方向延伸的两个臂。
作为进一步改进，所述侧壁包括相对设置的两个，相对设置的两个所述侧壁均设有一个所述出声口，所述上壁设有一个呈环状且横截面平行于所述振膜所在的平面的第一部分，所述第一部分包括两个相对设置的梁，两个所述梁分别靠近一个所述出声口设置。
本发明另一实施例还提供一种扬声器，包括:
振膜，所述振膜用于振动产生声波；
外壳，所述外壳包括与所述振膜相对设置的上壁和连接所述上壁与所述振膜的侧壁；以及
出声口，所述出声口设置于所述上壁或所述侧壁上，用于输出声波；
所述振膜和所述外壳共同围成与所述出声口连通的前声腔，所述前声腔和所述出声口共同形成前腔，所述上壁包括与所述侧壁连接的板，以及连接至所述板并从所述板向所述振膜延伸的突起部，该突起部靠近所述出声口设置。
作为进一步改进，所述突起部具有朝向所述振膜的内表面，所述突起部包括第一部分，所述第一部分对应的所述内表面与所述振膜所在的平面平行。
作为进一步改进，所述突起部还包括第二部，所述第二部分连接至所述第一部分并向远离所述出声口的方向延伸，从所述振膜到所述第二部分对应的内表面的距离沿向远离所述出声口的方向上逐渐增加。
作为进一步改进，所述突起部从所述板与所述侧壁之间的连接处延伸到所述出声口的周缘，从所述振膜到所述内表面的距离沿向远离所述出声口的方向上逐渐增加。
作为进一步改进，所述突起部呈 C 形，所述突起部包括靠近所述出声口设置的本体和连接于所述本体相对两末端并向远离所述出声口方向延伸的两个臂。
作为进一步改进，所述侧壁包括相对设置的两个，每一所述侧壁均设置一个所述出声口，所述突起部呈环形，包括呈相对设置的两个梁，每个所述梁分别靠近一个所述出声口设置。
上述并不包括本发明的所有方面的详尽清单，还包括从上文概述的各个方面的所有适当组合中可以实行的所有结构和方法，以及在下文详细说明中公开的并在随申请提交的权利要求中特别指出的结构和方法，这些组合具有上述摘要中没有具体叙述的特殊优点。
应该理解的是，前面的一般描述和下面的详细描述仅仅是示范性实施例，并不是限制本发明的范围。
 有益效果
本发明旨在通过极小化频率响应的变化来减少互调失真。本发明公开的实施例提供一种扬声器，包括振膜、外壳和出声口；振膜配置为产生声波。外壳包括与振膜相对设置的上壁以及连接上壁与振膜的侧壁，上壁具有面向振膜的内表面；出声口设置在上壁或侧壁，并配置为输出声波；振膜和外壳共同围成与出声口连通的前声腔，前声腔和出声口形成前腔；内表面具有位于接近出声口处的凸出部分，凸出部分与振膜的位置之间的距离小于所述内表面其它部分与振膜之间的距离。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一部分实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1a是由现有技术提供的传统扬声器的示意图；
图1b是与图1的现有技术扬声器对应的等效电路；
图2a是根据本发明的实施例对扬声器的外壳的示意性透视图；
图2b是根据图2a 的实施例示意的横截面侧视图；
图2c是与图2a 实施例对应的等效电路；
图3a是根据图2a 的实施例的I-I线的另一个实施例的非图示性横截面侧视图；
图3b是根据图2a的实施例的I-I线的另一个实施例的示意性横截面侧视图；
图3c是根据图2a的实施例的I-I线的另一个实施例的非图示横截面侧视图;
图3d是根据图2a的实施例的I-I线的另一个实施例的示意性横截面侧视图，其中扬声器包括两个出声口;
图3e是根据图2a的实施例的I-I线的另一个实施例的非图示横截面侧视图；
图4a是根据图2a的实施例的III-III线的另一个示意性的横截面侧视图；
图4b是根据图2a的实施例的I-I线的另一个示意性的横截面侧视图；
图5a是根据图2a的实施例的III-III线的另一个示意性的横截面图；
图5b是根据图2a的实施例的I-I线的另一个示意性的横截面图；
图6a是根据图2a的实施例的III-III线的另一个示意性的横截面侧视图;
图6b是根据图2a的实施例的I-I线的另一个示意性的横截面侧视图;
图7a 是根据本发明的另一个实施例对扬声器的外壳的示意性透视图；
图7b 是根据图7a的实施例的I-I线的示意性横截面侧视图；
图8a 是根据图7a的实施例的I-I线的另一个示例的示意性横截面侧视图；
图8b 是根据图7a的实施例的I-I线的另一个示例的非图示横截面侧视图；
图9a 是根据本发明(右)与现有技术(左)相比，扬声器的双音调互调失真测量图；
图9b 是根据本发明(右)与现有技术(左)相比，扬声器的多音互调失真测量图。
本发明公开的特征和优势将从以下详细描述中进一步说明，当与图纸一起使用时，其中像参考编号用于识别整个相应的元素，在图纸中，参考编号通常表示相同的、功能相似的和/或结构相似的元素。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
在本发明公开的实施例中使用的术语仅仅是为了描述特定的实施例，而不是为了限制本发明。除非文中另有说明，本发明的实施例和附加权利要求中使用的单数形式表达也意在表示其复数形式表达。
需要注意的是，本发明实施例中提及的“上”、“下”、“左”、“右”等表述是参照附图中的放置状态进行描述的，不应被解释为本发明的限制性实施例。此外，还应理解的是，在文中，在指构成另一元素“之上”或“之下”的元素时，有可能该元素是直接构成另一元素“之上”或“之下”的，也有可能该元素是通过中间元素构成另一元素“之上”或“之下”。
本发明所描述的实施例以及提及的实施例、示例等的提及表明，所描述的实施例可以包括特定的特征、结构或特征，但每个实施例不一定必须包括上述的特定的特征、结构或特征。此外，这些短语不一定指的是同一个具体体现。此外，当一个特定的特征、结构或特征与一个实施例联系起来描述时，可以理解为，不论是否明确描述，熟练掌握该技术的技术人员都知道如何将该特征、结构或特征与其他实施例联系起来。
请参图2a，图2a 是根据本发明的第一个实施例对扬声器的外壳的透视图。该扬声器包括被配置为产生声波的振膜10、被配置为输出声波的出声口30和外壳20。外壳20由与振膜10相对设置的上壁21和连接上壁21和振膜10的侧壁22组成。在本实施例中，出声口30可设置在侧壁22处。振膜10和上壁21相互间隔，并且与侧壁22一起共同围成前声腔。所述出声口20与所述前声腔相互连通，并共同形成扬声器的前腔。由振膜10产生的声波可以穿过前声腔，然后由出声口30导出。
请参图2b，图2b 示意性地显示了根据图2a 所示取自 I-I线的实施例的横截面侧视图。上壁21包括与出声口30的轴 II 平行的方向上的第一部分211和第二部分212。出声口30的轴 II 平行于其中位于静止位置的驱动横膈膜10所在的平面(以下称为“静止平面”) ，第一部分211位于靠近出声口30的位置，第二部分212位于第一部分212的旁边并远离出声口30。上壁21包括位于前声腔内并面向振膜10的内表面。内表面分为两个区域，即213a 和213b，分别包括在第一部分211和第二部分212中。位于第一部分211处的内表面213a 比位于第二部分212处的内表面213b 更接近于振膜10。也就是说，位于第一部分211处的内表面213a 与振膜10之间的距离小于位于第二部分212处的内表面213b 与振膜10之间的距离。这里的静止位置是指振膜10相对于上壁保持静止，没有振动时的位置。
本发明的实施例是通过减小上壁21的内表面的靠近出声口30的部分与隔膜之间的距离，从而减小振膜10对应的前声腔的一部分的宽度，以便有效地形成前声腔朝向出声口30延伸时的可变宽度，同时使前声腔的其余远离出声口30的部分的宽度更宽，虽然仍然存在不可避免的变量。与本实施例对应的等效电路如图2c 所示，与传统的扬声器相比，除了电容可变外，电路中还进一步引入了电感值可变的可变电感。宽度缩减的部分造成的结果是作为声感应器的距离缩短了，缩减的宽度随着振膜10的运动而变化，从而导致电感的变化。也就是说，前声腔的收缩部分可以作为扬声器的输出端口的一部分，而不是像传统设计那样将输出端口完全置于振膜10对应的位置之外。当振膜10随着音频信号移动时，前声腔的电容和其对应宽度收缩部分的电感都随着音频信号而变化。这两个可变分量的综合作用是减小引起互调失真的共振频率的整体变化，共振频率可近似保持不变。
在如图2b 所示的示例中，可设置两个相对的侧壁，并将其指定为第一侧壁22a 和第二侧壁22b。出声口30可设置在第一侧壁22a 处。第一部分211可以沿与出声口30的轴线 II 平行的方向延伸到上壁和第一侧壁22a 之间的连接处。也就是说，所述第一部分211具有与所述第一侧壁22a 连接的一端。位于第一部分211处的内表面213a 可以平行地延伸到所述静止平面，使得所述第一部分211相对于所述第二部分212形成台阶。如图2b 所示，位于第一部分211处的内表面213a 处于比出声口30的上边缘更高的位置。或者，第一部分211处的内表面213a 可能与出声口30的上边缘齐平，也就是说，从第一部分211处的内表面213a 到振膜10的距离等于从出声口30的上边缘到振膜10的距离。基于本发明总体概念和原则的变式将在下列其他示例和实施例中加以说明。
图3a 显示了另一个实施例的横截面示意图，出声口30可设置在侧壁22a 处。在图3a中，第一部分211进一步具有凹槽211a，凹槽211a在第一部分211处的内表面213a延伸，且按照振膜10对应在第一部分211下的边缘部分的延伸而延伸。如图3a 所示，位于第一部分211处的内表面213a 处于比出声口30的上边缘高的位置。或者，第一部分211处的内表面213a 可以与出声口30的上边缘齐平。
图3b 显示了另一个实施例的非图解的横截面侧视图。所述扬声器中还具有设置在侧壁22a 处的出声口30。在图3b 中，上壁21具有两个第二部分212a和212b，并且第一部分211夹在两个第二部分212a和212b 之间并将该两个第二部分212a和212b分别与其连接。也就是说，本示例中的第一部分211可不需要延伸以连接到第一侧壁22a，但是可以使一端朝向上壁21与第一侧壁22a 之间的连接处延伸，并且与第一侧壁22a 间隔，其中一个第二部分212b连接到第一侧壁22a。该其中第二部分212b 可以在与出声口30的轴线 II 平行的方向上具有比其中另一个第二部分212a 小得多的宽度，从而确保第一部分211位于接近出声口30的位置。如图3b 所示，位于第一部分211处的内表面213a 处于比出声口30的上边缘更高的位置。或者，第一部分211处的内表面213a 也可以与出声口30的上边缘齐平。
图3c 显示了另一个实施例的示意性横截面侧视图。扬声器还具有设置在侧壁22a 处的出声口30。在图3c 中，上壁21可进一步包括在第一部分211和第二部分212之间过渡的第三部分214。与相对于第二部分212形成台阶的第一部分211不同，第三部分214可以是斜坡，用于在台阶表面（第一部分211的内表面213a）和“地面”表面（第二部分212的内表面213b）之间提供连续的梯度过渡，即，位于第三部分214处的内表面213c 可以从位于第一部分211处的内表面213a 延伸到位于第二部分213b 处的内表面213b。因此，位于第三部分214处的内表面213c 与振膜10之间的距离可以从第一部分211向第二部分212方向逐渐增加。如图3c 所示，位于第一部分211的内表面213a 与出声口30的上边缘齐平。或者，也有可能位于第一部分211处的内表面213a 高于出声口30的上边缘，也就是说，从位于第一部分211的内表面213a 到振膜10的距离大于从出声口30的上边缘到振膜10的距离。
继上述所示的实施例之后，在其他一些示例中，扬声器可能分别在两个相反的侧壁上设有两个出声口。在这种情况下，靠近每个出声口的上部可能具有类似于上述任何一个例子的结构。例如，在图3c的实施例中进一步的，上壁可包括两个第一部分，或两个第三部分，设置在两个出声口的上壁的两个相对侧。比如，图3d 示意图还显示了另一个实施例，其中扬声器包括分别设置在第一侧壁22a 和第二侧壁22b 上的两个出声口，分别为第一出声口30a 和第二出声口30b。上壁21具有从第一出声口30a 到第二出声口30b 的方向上的对称结构。靠近第一侧壁22a (图3d 中的左侧)的上壁21的配置类似于上述示例，靠近第二侧壁22b (图3d 中的右侧)的上壁21与靠近第一侧壁22a 的上壁21对称配置。
图3e 根据图2a 的实施例示意性地显示了另一个示例，其中示意性地说明了横截面侧视图。扬声器还具有设置在侧壁22处的出声口30。在图3e 中，上壁21的内表面213和振膜10之间的距离可能在任何部分中不恒定或急剧增加。振膜10和上壁21的内表面213之间的距离可以从上壁21和第一侧壁22a 之间的连接逐渐增加到上壁21和第二侧壁22b 之间的连接。
图4a 和图4b 分别为根据图2a 的实施例中的III-III线和I-I线的另一个示例的示意性横截面侧视图。在这个实施例中，仅在第一侧壁22a 处提供一个出声口30，并且上壁21设有呈C形的第一部分211，第一部分211所对应的内表面213a平行于振膜10所在的平面。C 形的所述第一部分211具有沿第一侧壁22a 延伸的主体以及从主体的两个相对末端延伸的两个臂，并且该两个臂沿外壳20的连接至第一侧壁22a 两端的两个相对侧壁延伸。第一部分211的主体位于接近出声口30的位置，并且两个臂向远离出声口30方向延伸。位于第一部分211处的内表面213a 比位于第二部分212处的内表面213b 更接近于振膜10。
图5a 和图5b 示意性地显示了另一个实例的横截面侧视图，其中第一侧壁22a 和第二侧壁22b 的都具有一个出声口，分别为第一出声口30a和第二出声口30b。上壁21具有从第一出声口30a 到第二出声口30b 的方向上的对称结构。具体的，靠近第一侧壁22a (图5a 和5b 中的左侧)的上壁21的配置类似于图4a 和4b 中的示例。靠近第二侧壁22b (图5a 和5b 中的右侧)的上壁21与靠近第一侧壁22a 的上壁21对称配置。也就是说，上壁21的第一部分211包括两个，且两个第一部分211呈相互对称设置的两个 C 形结构，其中两个第一部分211分别位于相对第一出声口30a和第二30b的附近。
图6a 和图6b 示意性地显示了另一个实例的横截面侧视图，其中第一侧壁22a 和第二侧壁22b 的每一个都具有出声口，分别为第一出声口30a和第二出声口30b。在此实施例中，上壁21的第一部分211为环形。也就是说，从与所述静止平面平行的平面上取得的第一部分211的横截面为闭合圆。所述环形的第一部分211包括两对相对的梁，即沿所述外壳20的两组侧壁延伸的第一对和第二对。第一对相对的梁相互平行延伸并分别靠近第一侧壁22a 和第二侧壁22b，第二对相对的梁连接第一对相对的梁。位于第一部分211处的内表面213a 比位于第二部分212处的内表面213b 更接近于振膜10。
在另一个实施例中，如图7a 所示，出声口可能设置在扬声器的上壁21，而不是上述实施例所述的侧壁22。
图7b 示意性地显示了根据图7a 所示的I-I线的实施例的横截面侧视图。出声口30可设置在上壁21处。上壁21可以包括沿出声口30的径向的第一部分211和第二部分212。所述第一部分211可呈环绕所述出声口30的环形，并且所述第二部分还可设置为环绕所述第一部分211的环形。所述第一部分211可径向延伸以分别连接所述出声口30和所述第二部分212。位于第一部分211处的内表面213a 比位于第二部分212处的内表面213b 更接近于振膜10。也就是说，位于第一部分211处的内表面213a 与振膜10之间的距离小于位于第二部分212处的内表面213b 与振膜10之间的距离。位于第一部分211处的内表面213a 呈环形并沿出声口30的周缘延伸，因此从横截面侧视图中显示出由出声口30的两个相对侧面构成的两个阴影区域，如图7b 所示。类似地，位于第二部分212处的内表面213b 也是环形的，位于第一部分211处的内表面213a 可以平行地延伸到所述停止平面，使得所述第一部分211相对于所述第二部分212形成环形台阶。
图8a 为另一个示例的示意性横截面侧视图。扬声器还具有设置在上壁21中间的出声口30。在图8a 中，上壁21可进一步包括在第一部分211和第二部分212之间过渡的第三部分214。第三部分214处的内表面213c 可以从第一部分211处的内表面213a 延伸到第二部分213b 处的内表面213b，因此为环形。且，位于第三部分214的内表面213c 与振膜10之间的距离可以从第一部分211向第二部分212的方向在径向上逐渐增加。
图8b 为另一个示例的示意性横截面侧视图。扬声器还具有设置在上壁21中间的出声口30。在图8b 中，在本示例中，在上壁中没有形成台阶，相反，对于从出声口30的周边到上壁21和侧壁22之间的连接处的上壁的内表面可以呈现连续的梯度。振膜10与上壁21的内表面213之间的距离可以从出声口30的周边逐渐增加到上壁21与侧壁22之间的连接处。
应该注意的是，上述实施例及其示例中描述的上壁可以是整体形成的。或者，上壁可以形成为两个或多个部件，包括固定在侧壁上或与侧壁整体形成的板，以及连接到朝向振膜的板的表面上的突起部。突起部从板向振膜延伸形成上述台阶和/或斜坡。
虽然，在上述实施例及其示例中，引入的扬声器的外壳形状为长方体，但应该认识到，本公开可能适用于具有其他形状的扬声器，例如圆柱体。
图9a 和图9b 分别为根据本发明(右)与相有技术(左)相比，可见本发明解决方案的互调失真明显减少，其中图9a 采用双音测试信号，并且图9b 采用多音测试信号。图9a中驱动扬声器的信号由800Hz 和5kHz 的两个正弦峰组成。与左图相比，右图中类似于“草”的减少表明根据目前的本发明的解决方案的失真减少。图9b 中的多音测量也是如此。
虽然本发明公开的具体实施例已经在上文中描述过，但是如果公开的实施方式不是如上所述的具体实施例，但也是根据本发明容易想到和理解的。上面的描述是为了说明，而不是限制。因此，本领域技术人员显然可以对所述公开作出修改，而不偏离本发明的权利要求保留范围。
需要理解的是，具体实施方式部分是用来解释权利要求。摘要和发明内容可以列出发明人所设想的一个或多个但不是全部的实施例，因此，无意以任何方式限制本发明和附加的权利要求。
目前的公开已在上文中借助功能性构件描述了特定功能的实施例及其关系。为了方便描述，这些功能构件的边界在本文中被任意定义。只要适当地执行指定的功能及其关系，就可以定义为替换的边界。
前面对具体实体的描述充分地公开的一般性质，其他人可以通过运用现有技术中的知识，不需要过度的实验就可以随时修改和/或适应各种应用这样的具体实例，只要不偏离目前公开的一般概念。因此，根据本发明提供的教学和指导，此类适应和修改旨意处于所公开的实施例的意义和等效范围内。应当理解，本发明的术语或术语是为了描述的目的，而不是为了限制，因此，本发明的术语或措辞应由本领域技术人员根据教学和指导进行解释。
上述所述实施例仅是本发明的首选实施例，并不是限制本发明。在本发明范围内所作的任何修改、等价替换和改进，均属于本发明的保护范围。

Claims (18)

  1. 一种扬声器，包括:
    振膜，用于振动产生声波;
    外壳，所述外壳包括与所述振膜相对设置的上壁和连接所述上壁和所述振膜的侧壁；所述上壁具有朝向所述振膜的内表面；以及
    出声口，所述出声口设置在所述上壁或所述侧壁上，用于输出声波；其特征在于，
    所述振膜和所述外壳共同围成了与所述出声口连通的前声腔，所述前声腔和所述出声口共同形成前腔，所述内表面设有靠近所述出声口的突起部，从所述突起部的位置到所述振膜的距离小于从所述内表面的其他部分的位置到所述振膜的距离。
  2. 根据权利要求1所述的扬声器，其特征在于，所述出声口设置在所述侧壁，所述上壁包括分别与所述出声口的轴线平行的第一部分和第二部分，所述第一部分靠近所述出声口，所述第二部分相较于所述第一部分远离所述出声口，从所述振膜到所述第一部分所对应的所述内表面的距离比从所述振膜到所述第二部分所对应的所述内表面的距离小。
  3. 根据权利要求2所述的扬声器，其特征在于，所述第一部分所对应的所述内表面所在的平面平行于到所述振膜所在的平面。
  4. 根据权利要求3所述的扬声器，其特征在于，所述上壁还包括位于所述第一部分和所述第二部分之间的第三部分，所述振膜至所述第三部分所对应的所述内表面的距离沿从所述第一部分到所述第二部分的方向逐渐增加。
  5. 根据权利要求2所述的扬声器，其特征在于，所述第一部分所对应的所述内表面与所述出声口的上边缘平齐。
  6. 根据权利要求1所述的扬声器，其特征在于，所述侧壁包括相对设置的两个，所述出声口设置于相对设置的两个所述侧壁中的其中一个，所述上壁设有相对的第一端和第二端，所述第一端连接于相对设置的两个所述侧壁中设置所述出声口的其中一个所述侧壁，所述第二端连接至相对设置的两个所述侧壁中的另一个所述侧壁，从所述振膜到所述上壁的所述内表面的距离沿从所述第一端到所述第二端的方向逐渐增加。
  7. 根据权利要求1所述的扬声器，其特征在于，所述出声口设置在所述上壁，所述上壁包括环绕所述出声口的第一部分和环绕所述第一部分的第二部分，所述第一部靠近所述出声口设置，从所述振膜到所述第一部分所对应的所述内表面的距离小于从所述振膜到所述第二部分所对应的所述内表面的距离。
  8. 根据权利要求7所述的扬声器，其特征在于，所述第一部分所对应的所述内表面所在的平面平行于所述振膜所在的平面。
  9. 根据权利要求8所述的扬声器，其特征在于，所述上壁还包括位于所述第一部分和所述第二部分之间的第三部分，从所述振膜至所述第三部分所对应的所述内表面的距离沿从所述第一部分到所述第二部分的方向逐渐增加。
  10. 根据权利要求1所述的扬声器，其特征在于，所述出声口设置于所述上壁，所述振膜至所述上壁的所述内表面的距离，沿从所述出声口至所述上壁与所述侧壁的连接处的方向逐渐增加。
  11. 根据权利要求1所述的扬声器，其特征在于，所述上壁设有一个呈C形的第一部分，所述第一部分的横截面平行于所述振膜所在的平面，所述第一部分包括靠近所述出声口的本体和连接于所述本体相对两末端并向远离所述出声口方向延伸的两个臂。
  12. 根据权利要求1所述的扬声器，其特征在于，所述侧壁包括相对设置的两个，相对设置的两个所述侧壁均设有一个所述出声口，所述上壁设有一个呈环状且横截面平行于所述振膜所在的平面的第一部分，所述第一部分包括两个相对设置的梁，两个所述梁分别靠近一个所述出声口设置。
  13. 一种扬声器，包括:
    振膜，所述振膜用于振动产生声波；
    外壳，所述外壳包括与所述振膜相对设置的上壁和连接所述上壁与所述振膜的侧壁；以及
    出声口，所述出声口设置于所述上壁或所述侧壁上，用于输出声波；其特征在于，
    所述振膜和所述外壳共同围成与所述出声口连通的前声腔，所述前声腔和所述出声口共同形成前腔，所述上壁包括与所述侧壁连接的板，以及连接至所述板并从所述板向所述振膜延伸的突起部，该突起部靠近所述出声口设置。
  14. 根据权利要求13所述的扬声器，其特征在于，所述突起部具有朝向所述振膜的内表面，所述突起部包括第一部分，所述第一部分对应的所述内表面与所述振膜所在的平面平行。
  15. 根据权利要求14所述的扬声器，其特征在于，所述突起部还包括第二部，所述第二部分连接至所述第一部分并向远离所述出声口的方向延伸，从所述振膜到所述第二部分对应的内表面的距离沿向远离所述出声口的方向上逐渐增加。
  16. 根据权利要求14所述的扬声器，其特征在于，所述突起部从所述板与所述侧壁之间的连接处延伸到所述出声口的周缘，从所述振膜到所述内表面的距离沿向远离所述出声口的方向上逐渐增加。
  17. 根据权利要求13所述的扬声器，其特征在于，所述突起部呈 C 形，所述突起部包括靠近所述出声口设置的本体和连接于所述本体相对两末端并向远离所述出声口方向延伸的两个臂。
  18. 根据权利要求13所述的扬声器，其特征在于，所述侧壁包括相对设置的两个，每一所述侧壁均设置一个所述出声口，所述突起部呈环形，包括呈相对设置的两个梁，每个所述梁分别靠近一个所述出声口设置。
PCT/CN2023/080192 2022-08-02 2023-03-08 扬声器 WO2024027152A1 (zh)

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CN107360516A (zh) * 2017-06-30 2017-11-17 瑞声科技(新加坡)有限公司 扬声器箱
US20190082252A1 (en) * 2017-09-11 2019-03-14 Apple Inc. Front port resonator for a speaker assembly
CN208638567U (zh) * 2018-08-06 2019-03-22 瑞声科技(新加坡)有限公司 扬声器箱
CN208638703U (zh) * 2018-08-10 2019-03-22 瑞声科技(新加坡)有限公司 扬声器箱
WO2020000925A1 (zh) * 2018-06-25 2020-01-02 歌尔股份有限公司 发声器件及便携终端
CN212936102U (zh) * 2020-07-09 2021-04-09 瑞声科技(新加坡)有限公司 扬声器箱
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