CN110198507B - Novel vibrating diaphragm and loudspeaker - Google Patents
Novel vibrating diaphragm and loudspeaker Download PDFInfo
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- CN110198507B CN110198507B CN201910497676.9A CN201910497676A CN110198507B CN 110198507 B CN110198507 B CN 110198507B CN 201910497676 A CN201910497676 A CN 201910497676A CN 110198507 B CN110198507 B CN 110198507B
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- 238000010438 heat treatment Methods 0.000 claims description 41
- 238000005452 bending Methods 0.000 claims description 40
- 238000001816 cooling Methods 0.000 claims description 34
- 238000000465 moulding Methods 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 16
- 230000007704 transition Effects 0.000 claims description 12
- 239000004697 Polyetherimide Substances 0.000 claims description 6
- 229920001601 polyetherimide Polymers 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000002474 experimental method Methods 0.000 description 13
- 230000006872 improvement Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
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- 230000035807 sensation Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000000087 stabilizing effect 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
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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
- H04R9/06—Loudspeakers
Abstract
The invention provides a novel vibrating diaphragm, which relates to the technical field of loudspeaker products and comprises a vibrating plate and a flexible plate which is matched and attached with the vibrating plate; the vibrating plate comprises a ball top, a folded ring part arranged around the periphery of the ball top, and an extension part arranged outside the folded ring part in a surrounding manner, wherein the folded ring part protrudes towards one side away from the bonding of the vibrating plate and the flexible plate; the flexible board comprises a central board for providing rigidity, a border part which is adhered to the outer extension part, and a plurality of support bars which are connected between the central board and the border part; an annular cavity is formed between the central plate and the frame part; the support bars are arranged in the annular cavity, and the central plate, the frame parts and the support bars are all arranged in a coplanar mode. The support bars are connected and supported between the central plate and the frame part mutually attached to the outer extending part of the vibrating plate, so that resonance is not easy to occur when the support bars are in a linear state during vibrating diaphragm working, stable attachment between the vibrating plate and the flexible plate is guaranteed, and overall sensitivity is improved. The application further provides a loudspeaker.
Description
Technical Field
The invention relates to the technical field of loudspeaker products, in particular to a novel vibrating diaphragm and a loudspeaker.
Background
The loudspeaker is used as a device capable of converting electric energy into acoustic energy, and is widely applied to mobile terminals such as mobile phones, computers and PADs, and the performance of the loudspeaker directly influences the sound playing effect of mobile terminal devices matched with the loudspeaker. The conventional structure of the speaker generally includes a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil, and the voice coil, after receiving a current signal from an external circuit, can reciprocate under the action of an electromagnetic field to cut magnetic lines of force, so as to drive the diaphragm to vibrate, thereby radiating sound waves to the outside, and completing the conversion from electric energy to sound energy. Thus, the diaphragm is one of the key components for the vibration sound of the loudspeaker.
The vibrating diaphragm at the present stage mainly comprises a silica gel vibrating diaphragm and a plastic vibrating diaphragm, and the plastic vibrating diaphragm is usually formed by compounding single-layer or multi-layer plastic films. The compliance of the diaphragm is difficult to control no matter the diaphragm is a silica gel diaphragm or a plastic diaphragm, the compliance of the diaphragms manufactured by the same process is different, and the consistency is poor. Meanwhile, the conventional vibrating diaphragm is narrower in compliance linear region, when the vibrating diaphragm vibrates in a large displacement mode, larger nonlinear connection exists, resonance and other problems are easy to occur, and therefore the loudspeaker is distorted, the sound quality is poor, and accordingly the performance of the loudspeaker is unstable. Along with the rapid development of the electronic industry and the continuous progress of scientific technology, the requirements of people on the performance of the loudspeaker are higher and higher, but the requirements of users cannot be well met due to the limitations of the material and the structure of the vibrating diaphragm at present, and further improvement and exploration are needed.
Disclosure of Invention
The invention discloses a novel vibrating diaphragm and a loudspeaker, which are stable in structure and aim to solve the problems that the existing vibrating diaphragm is poor in consistency, easy to generate resonance and the like.
The invention adopts the following scheme:
a novel vibrating diaphragm comprises a vibrating plate and a flexible plate which is matched and attached with the vibrating plate; the vibrating plate comprises a ball top, a folded ring part arranged around the periphery of the ball top and an extension part arranged outside the folded ring part in a surrounding manner, and the folded ring part protrudes towards one side far away from the bonding position of the vibrating plate and the flexible plate; the flexible board comprises a central board for providing rigidity, a border part which is adhered to the outer extension part, and a plurality of support bars which are connected between the central board and the border part; an annular cavity is formed between the central plate and the frame part; the support bars are arranged in the annular cavity, and the central plate, the frame parts and the support bars are all arranged in a coplanar mode.
As a further improvement, the folded ring part is provided with an outer ring arc edge and an inner ring arc edge; the outer extension part is matched with the frame part, and the frame part is attached to the area outside the arc edge of the outer ring; the top of the ball is matched with the center plate, and the center plate is attached to the inner area of the inner ring arc edge.
As a further improvement, the central plate comprises two first long sides and two first short sides, the first long sides are opposite to each other, the frame part comprises two second long sides and two second short sides, the second long sides are opposite to each other, the second short sides are opposite to each other, the first long sides are opposite to each other, the first short sides are opposite to each other, and the joints of the first long sides, the second long sides and the second short sides are provided with rounding angles.
As a further improvement, the two first long sides and the two first short sides enclose an inner ring, the two second long sides and the two second short sides enclose an outer ring, and the outer ring and the inner ring enclose each other to form the annular cavity.
As a further improvement, a plurality of support bars are regularly arranged between the central plate and the frame part, each support bar comprises a first bending part, a second bending part and a transition part for connecting the first bending part and the second bending part, the first bending part and the second bending part are respectively arranged at two ends of the transition part, the first bending part is connected to the outer ring, the second bending part is connected to the inner ring, and the transition part and the first long side or the first short side of the position are arranged in parallel.
As a further improvement, the central plate is rectangular, and the side frame parts are arranged on the outer side of the central plate in an equidistant ring manner; the annular cavity comprises two first areas close to the long side of the center plate and two second areas close to the short side of the center plate, the two first areas are symmetrically arranged, the two second areas are symmetrically arranged, and the first areas and the second areas are communicated with each other; each region is provided with a group of support bars which are symmetrically arranged, the two first bending parts of each group of support bars are far away from each other along the symmetry line of the support bars, and the two second bending parts of each group of support bars are close to each other along the symmetry line of the support bars.
As a further improvement, a plurality of hollow structures are formed between the four groups of support bars and the annular cavity, and the hollow structures are regularly arranged in the flexible plate.
As a further improvement, the first bending part, the second bending part and the transition part of each supporting bar are integrally formed and are arranged in a coplanar mode.
As a further improvement, the flexible board is integrally molded; the flexible board is made of polyetherimide material.
As a further improvement, the vibration plate is formed by the section bar through air pressure forming and hot press forming, and comprises the following steps: placing a mould on a forming table, and placing the profile in the mould; heating the die to a first temperature, and introducing high-pressure gas into the die for 15-25s; heating the die to a second temperature for 100-140s, maintaining the second temperature, and preserving the temperature for 30-50s; cooling the die to a third temperature for 30-50s; and opening the mould, and taking out the vibrating plate after the mould is lifted.
As a further improvement, the mold is provided with an air pressure mold cavity for molding the vibrating plate, the molding table is provided with a pressing plate, the pressing plate is provided with a heating pipeline for providing molding temperature and two cooling channels respectively arranged on the upper side and the lower side of the heating pipeline, the heating pipeline and the cooling channels are arranged at intervals, the heating pipeline is used for introducing hot steam, the cooling channels are used for introducing cooling liquid, and each heating pipeline and each cooling channel comprises two bent pipelines which are symmetrically arranged left and right, and each bent pipeline is formed by connecting a plurality of S-shaped pipelines.
As a further improvement, the mold is also provided with ventilation holes which are uniformly arranged in the area outside the mold cavity and are communicated with the mold cavity and the external atmosphere.
The application provides a speaker in addition, including foretell novel vibrating diaphragm and be used for supporting the protection the outer support of novel vibrating diaphragm, the outer support with novel vibrating diaphragm encloses into and holds the chamber for place magnetic circuit.
By adopting the technical scheme, the invention can obtain the following technical effects:
the utility model provides a novel vibrating diaphragm, through being equipped with the flexible sheet that laminates with vibrating plate looks adaptation, and the frame portion of flexible sheet laminates each other with the extension portion of vibrating plate and sets up, form an annular cavity between the center board of flexible sheet and the frame portion, a plurality of support bars set up in annular cavity and connect support between frame portion and center board, when making the center board provide the rigidity for the ball top, a plurality of support bars connect support in the center board and with the extension portion of vibrating plate laminate each other between the frame portion that sets up, the support bar provides effective stable linear support, support bar is in the linear condition and is difficult to produce resonance when guaranteeing the vibrating diaphragm work, and the laminating of stabilizing between vibrating plate and the flexible sheet has strengthened the compliance of flexible sheet, holistic sensitivity has been improved.
Further, the ring folding part is provided with an outer ring arc edge and an inner ring arc edge, the frame part is attached to the outer ring arc edge and is arranged in the outer area outside the outer ring arc edge, the central plate is attached to the inner area inside the inner ring arc edge, the area of the annular cavity is ensured to be larger than the plane area of the ring folding part, the compliance linear area of the vibrating diaphragm is widened, and the tone quality performance of the loudspeaker is improved.
Further, the plurality of support bars are regularly arranged between the central plate and the frame part, and each support bar comprises a first bending part, a second bending part and a transition part for connecting the first bending part and the second bending part. And the annular cavity comprises two first areas and two second areas, the two first areas are symmetrically arranged, the two second areas are symmetrically arranged, and the first areas and the second areas are communicated with each other. Each area is provided with a group of supporting bars, two groups of supporting bars positioned in the first area are symmetrically arranged, and two groups of supporting bars positioned in the second area are symmetrically arranged, so that the regular linear supporting state of the supporting bars is ensured.
Further, the forming conditions of three-section heating constant pressure are adopted in the preparation process of the vibrating plate, the air charging time, the heating/heat preservation time and the cooling time are controlled, an S-shaped cooling flow channel and a heating pipeline which is arranged in a bending manner are arranged in the pressing plate of the forming table, the uniformity and stability of the temperature of the whole die are ensured, the difference of formed products is reduced, meanwhile, the heating and cooling efficiency is greatly improved, and the quality of the products is ensured while the forming efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a novel diaphragm according to an embodiment of the present invention at a first viewing angle, wherein the right side is an exploded schematic diagram;
FIG. 2 is a schematic structural diagram of the novel diaphragm of embodiment 1 of the present invention at a second viewing angle;
FIG. 3 is a schematic view of the structure of FIG. 2 in a bottom view, wherein the right side is an exploded view;
FIG. 4 is a schematic structural diagram of the novel diaphragm of embodiment 1 of the present invention at a second viewing angle;
FIG. 5 is a schematic structural diagram of the novel diaphragm of embodiment 1 of the present invention at a third viewing angle;
fig. 6 is a schematic structural view of a molding die of a vibration plate of embodiment 1 of the present invention;
FIG. 7 is a schematic diagram showing the cooperation between a mold and a pressing plate of a vibration plate according to embodiment 1 of the present invention, wherein a base of a molding table is disposed below the mold;
FIG. 8 is a schematic view of the heating circuit of FIG. 7;
FIG. 9 is a schematic view of the cooling flow path of FIG. 7;
FIG. 10 is a schematic diagram of a prior art diaphragm structure, wherein the right side is an exploded view;
fig. 11 is a schematic structural view of a speaker according to embodiment 2 of the present invention, wherein the right side is an exploded schematic view.
Icon: 1-a vibrating plate; 11-top of sphere; 12-a ring folding part; 121-outer ring arc edge; 122-inner ring arc edge; 13-an epitaxial part; 2-a flexible board; 21-a central panel; 211-a first long side; 212-a first short side; 22-frame part; 221-a second long side; 222-a second short side; 23-supporting bars; 231-a first bend; 232-a second bend; 233-transition; 24-an annular cavity; 3-a mold; 31-pneumatic mold cavity; 32-ventilation holes; 4-pressing the plate; 41-heating the pipeline; 42-cooling flow channels; 5-an existing vibrating plate; 6-center film pasting; 7-an outer bracket; a-a first region; b-a second region.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Example 1
With reference to fig. 1, this embodiment provides a novel vibrating diaphragm, which includes a vibrating plate 1 and a flexible plate 2 attached to the vibrating plate 1 in an adaptive manner.
The vibrating plate 1 comprises a ball top 11, a folded ring part 12 arranged around the periphery of the ball top 11 and an extension part 13 arranged outside the folded ring part 12 in a surrounding manner, wherein the folded ring part 12 protrudes towards one side, away from the bonding between the vibrating plate 1 and the flexible plate 2, so that the vibrating plate 1 and the flexible plate 2 are bonded stably. The flexible board 2 includes a center board 21 for providing rigidity, a frame 22 provided to be bonded to the outer peripheral portion 13, and a plurality of support bars 23 connected between the center board 21 and the frame 22. An annular cavity 24 is formed between the central plate 21 and the border 22, the support bar 23 is disposed in the annular cavity 24, and the central plate 21, the border 22 and the support bar 23 are all disposed coplanar. By providing the flexible board 2 which is fit with the vibration board 1, and the frame portion 22 of the flexible board 2 is fit with the outer extending portion 13 of the vibration board 1, an annular cavity 24 is formed between the central board 21 and the frame portion 22 of the flexible board 2, and a plurality of supporting bars 23 are arranged in the annular cavity 24 and are connected and supported between the frame portion 22 and the central board 21, so that the central board 21 provides rigidity for the ball top 11. Meanwhile, a plurality of support bars 23 are connected and supported between the central plate 21 and the frame part 22 mutually attached to the extension part 13 of the vibration plate 1, the support bars 23 provide effective and stable linear support, the support bars 23 are in a linear state when the vibration film works, and resonance is not easy to generate. And the stable laminating between vibrating plate 1 and the flexible board 2 has strengthened the compliance of flexible board 2, has improved holistic sensitivity.
Referring to fig. 2, the folded ring portion 12 has an outer annular arc edge 121 and an inner annular arc edge 122. The extension 13 is fitted to the frame 22, and the frame 22 is fitted to the outer ring edge 121. The ball top 11 is matched with the center plate 21, and the center plate 21 is arranged in an area within the inner circular arc edge 122 in a fitting way. The frame part 22 is attached to the area outside the outer ring arc edge 121, the central plate 21 is attached to the area inside the inner ring arc edge 122, the area of the annular cavity 24 formed between the central plate 21 and the frame part 22 is ensured to be larger than the plane area of the folded ring part 12, the compliance linear area of the vibrating diaphragm is widened, and the sound quality performance of the loudspeaker is improved.
Referring to fig. 3 and 4, the center panel 21 includes two oppositely disposed first long sides 211 and two oppositely disposed first short sides 212. The frame 22 includes two second long sides 221 opposite to the first long sides 211 and two second short sides 222 opposite to the first short sides 212, and rounded corners are disposed at the joints between the first long sides 211 and the first short sides 212, and between the second long sides 221 and the second short sides 222. The first long side 211 and the first short side 212 are located outside the central plate 21, the second long side 221 and the first short side 212 are located inside the border portion, and the respective long sides and short sides are connected through rounded corners. In the present embodiment, two first long sides 211 and two first short sides 212 enclose an inner ring, two second long sides 221 and two second short sides 222 enclose an outer ring, and an annular cavity 24 is formed between the outer ring and the inner ring. Specifically, the supporting strips 23 are disposed between the central plate 21 and the frame 22, and each supporting strip 23 includes a first bending portion 231, a second bending portion 232, and a transition portion 233 connecting the first bending portion 231 and the second bending portion 232. The first bending portion 231 and the second bending portion 232 are respectively disposed at two ends of the transition portion 233, and the first bending portion 231 is connected to the outer ring, and the second bending portion 232 is connected to the inner ring. The transition portion 233 is disposed parallel to the first long side 211 or the first short side 212 at the location and is located on the same plane, so that the supporting bar 23 is connected with the border portion 22 and the center plate 21 in a compliant manner.
Further, the center plate 21 is rectangular, and the frame 22 is provided on the outside of the center plate 21 at equal intervals. The annular cavity 24 comprises two first areas a, which are located symmetrically, close to the first long side 211 of the central plate 21, and two second areas B, which are located symmetrically, close to the first short side 212 of the central plate 21, both of which communicate with each other. Each region is provided with a group of supporting bars 23 which are symmetrically arranged, the two first bending parts 231 of each group of supporting bars 23 are mutually far away along the symmetry line of the supporting bars, and the two second bending parts 232 of each group of supporting bars 23 are mutually close along the symmetry line of the supporting bars. So that each area is provided with a group of supporting bars 23, and the two groups of supporting bars 23 positioned in the first area A are symmetrically arranged, and the two groups of supporting bars 23 positioned in the second area B are symmetrically arranged, thereby ensuring the regular linear supporting state of the supporting bars 23.
Further, a plurality of hollow structures (not shown) are formed between the four sets of support bars 23 and the annular cavity 24, and the hollow structures are arranged in the flexible board 2, so that the sensitivity and the volume characteristics of the loudspeaker are improved by reducing the weight of the vibrating diaphragm. In this embodiment, the first bending portion 231, the second bending portion 232, and the transition portion 233 of each supporting bar 23 are all integrally formed and arranged in a coplanar manner, so that the flexible board 2 and the vibrating board 1 are convenient to process and manufacture, and the fit between the flexible board and the vibrating board is ensured.
Preferably, the vibration plate 1 and the flexible plate 2 are rectangular. The flexible board 2 is integrally formed and is made of polyetherimide material. The polyether imide is PE I for short, is super engineering plastic manufactured by amorphous polyether imide, has good toughness and strength, large size stability and rigidity, and is suitable for conditions of large vibration frequency and high vibration requirement. The flexible board 2 is fixed with the vibrating board 1 through bonding, so that the effective bonding arrangement is ensured. The vibrating plate 1 is formed by the section bar through air pressure forming and hot press forming, and comprises the following steps:
s1: the mould 3 is placed on a forming table and the profile is placed in the mould 3. Wherein the forming table (not shown) comprises a press plate 4 for providing a press force and temperature to the mold 3, a heating pipe connected to the press plate 4, a cooling pipe, and a gas pressure pipe for providing gas to the mold 3. The heating pipe and the cooling pipe respectively supply hot steam and cooling liquid for the pressing plate 4 to control the temperature of the forming table, so as to provide the required forming conditions for the mold 3, such as forming pressing force, forming time, temperature, air pressure and the like of the mold 3.
S2: and heating the die 3 to a first temperature, and introducing high-pressure gas into the die 3 for 15-25s. Wherein the first temperature is 110-130 ℃, the air pressure value is 4kg, and the air pressure is kept stable continuously.
S3: and heating the die 3 to a second temperature for 100-140s, maintaining the second temperature, and preserving the heat for 30-50s. Wherein the second temperature is 160-180 ℃.
S4: cooling the die 3 to a third temperature for 30-50s. Wherein the third temperature is in the range of 70 ℃ to 90 ℃.
S5: the mold 3 is opened, and the vibration plate 1 is removed from the mold. Wherein, the die-taking temperature is between 60 and 70 ℃, and the die-taking temperature ensures that the product is easy to be demolded and is not damaged.
Referring to fig. 6 and 7, the mold 3 is provided with an air pressure cavity 31 for molding the vibration plate 1, the air pressure cavity 31 is formed by closing an upper mold and a lower mold of the mold 3, the section bar of the vibration plate 1 is placed in the air pressure cavity 31, and an air pressure pipe for providing air for the mold 3 is communicated into the air pressure cavity 31 for inflation molding. In the molding process, the mold 3 is placed on a molding table, and the pressing plate 4 is pressed down to the upper end face of the mold 3 to provide molding pressing force for the mold 3.
Referring to fig. 7, 8 and 9, for a more visual illustration, the cooling flow channel 42 is hidden in fig. 8, and the heating pipe 41 is hidden in fig. 9. The pressing plate 4 is provided with a heating pipeline 41 for providing forming temperature and two cooling flow passages 42 respectively arranged on the upper plane and the lower plane of the heating pipeline 41. The heating pipeline 41 and the cooling flow channels 42 are arranged at intervals, the heating pipeline 41 is positioned between the planes of the two cooling flow channels 42, the heating pipeline 41 is used for introducing hot steam, and the cooling flow channels 42 are used for introducing cooling liquid. The heating pipeline 41 and the cooling runner 42 each comprise two curved pipelines which are symmetrically arranged on the same plane, each curved pipeline is formed by connecting a plurality of S-shaped pipelines, and the curved pipelines are distributed in the plane of the whole pressing plate 4 so as to improve the overall heat supply or cooling rate of the pressing plate 4 and enable the die 3 to be heated/cooled uniformly. The heating pipe and the cooling pipe of the forming table are respectively communicated into the corresponding bending pipelines so as to provide hot steam or cooling liquid.
The air pressure forming and hot press forming preparation of the method controls the air charging time, the heating/heat preservation time and the cooling time through the forming conditions of three-section heating and constant pressure, the S-shaped cooling flow channel 42 and the heating pipeline 41 which is bent and distributed on the pressing plate 4, the uniformity and stability of the temperature of the die 3 are ensured, the difference of formed products is reduced, the heating and cooling efficiency is greatly improved, and the quality of the products is ensured while the forming efficiency is improved. The existing vibrating plate forming mode has the defects that the heating/cooling mode is single, and the distribution of each pipeline is uneven, so that the die temperature is uneven, and the production efficiency and the yield are affected. The application independently sets up cooling runner 42 and heating pipeline 41, and two cooling runners 42 are located the upper and lower two planes of heating pipeline 41 respectively for pressfitting board 4 has promoted 20% to the heating efficiency of mould 3, and mould 3 intensifies to the highest shaping temperature, by original 150s, becomes 120s. The cooling efficiency of the die 3 by the pressing plate 4 is improved by 33%, the die 3 is lowered to the die taking temperature, the original 60s is changed into 40s, and the molding production efficiency is greatly improved.
Referring to fig. 6, the mold 3 is further provided with ventilation holes 32, and the ventilation holes 32 are uniformly arranged on the area outside the air pressure mold cavity 31 and are arranged at equal intervals in a surrounding manner so as to communicate the air pressure mold cavity 31 with the external atmosphere, thereby ensuring the air pressure stability of the forming process of the vibration plate 1, and simultaneously avoiding the bad convex hulls of the formed vibration plate caused by the ventilation holes 32 and affecting the flatness of the vibration plate 1.
The following experimental study was conducted with respect to differences in the opening positions of the ventilation holes in the mold and the molding modes, resulting in differences in the yield and molding time of the vibration plate. Experimental group 1 was selected: the prior vibrating plate is formed in a mode, and the ventilation holes are formed in the area of the air pressure die cavity. Experiment group 2: the forming mode of the vibrating plate, and the ventilation holes are formed in the area of the air pressure die cavity. Experiment group 3: the shaping mode of vibrating plate of this application, and the bleeder vent is seted up outside the region of atmospheric pressure die cavity. Please refer to table 1-1 for specific details.
TABLE 1-1 data sheet for yield and molding time
| Experiment group 1 | Experiment group 2 | Experiment group 3 | |
| Yield of finished products | 91％ | 95％ | 98％ |
| During moldingLong length | 250s | 200s | 200s |
As can be seen from the above Table 1-1, the yield and the molding time period were different under different experimental conditions. The molding duration of the experimental group 1 comprises the following steps: heating duration T 1 Length of time T for heat preservation 2 Length of time T for +cooling 3 =150s+40s+60s=250s. The molding duration of each of the experimental group 2 and the experimental group 3 comprises: the temperature rise period t1+the heat preservation period t2+the temperature reduction period t3=120s+40s+40s=200 s. The production efficiency of the forming mode of the vibrating plate is obviously higher through comparison of the experimental group 1 and the experimental group 2 or the experimental group 3. The forming mode of the vibrating plate is obviously higher in yield through the comparison of the experimental group 1 and the experimental group 2. The air holes are formed outside the area of the air pressure die cavity according to the comparison of the experimental group 2 and the experimental group 3, and the yield of products is obviously improved.
Referring to fig. 10, a schematic diagram of a vibrating diaphragm in the prior art is shown, wherein the conventional vibrating diaphragm includes a conventional vibrating plate 5 and a central film 6 attached to the conventional vibrating plate 5, and the central film 6 is attached to a dome region of the conventional vibrating plate 5. The central film is made of polyetherimide. The experiment test shows that the limit value of the power/voltage which can be born by the existing diaphragm is 1.5W/3V, and the limit value of the power/voltage which can be born by the novel diaphragm is 4W/4.9V. It should be noted that, the measurement of the sustainable power/voltage value of the diaphragm may be obtained by the existing detection method, and will not be described herein in detail.
In this experimental test, a comparison group was selected: existing diaphragm (1.5W/3V), test group 1: novel vibrating diaphragm (1.5W/3V), test group 2: novel diaphragm (2.5W/3.8V), test group 3: the novel diaphragm (4W/4.9V) was tested for Sound Pressure Level (SPL) and harmonic distortion (THD), respectively, see Table 2-1, table 2-2.
TABLE 2-1 diaphragm Sound Pressure Level (SPL) test table
As can be seen from the above Table 2-1, the values of the test table are decibel values (in dB) for the comparative group and the experimental group at the same frequency range. The higher the decibel value is, the larger the loudness is, so that the sound quality effect of the vibrating diaphragm is better. From a diaphragm Sound Pressure Level (SPL) test table it is apparent that: 1. the novel vibrating diaphragm provided by the application has higher and more stable decibel value under the same frequency range with the existing vibrating diaphragm under the condition of bearing the same power/voltage value (refer to a comparison group and an experimental group 1), meets the sound effect requirement of a loudspeaker, and has wide market application prospect. 2. The novel vibrating diaphragm that this application provided has the power/voltage limit value that is higher than current vibrating diaphragm, and novel vibrating diaphragm under the condition of different power/voltage value (refer to experiment group 1, experiment group 2 and experiment group 3), the decibel value is along with the increase of the power/voltage value that bears and corresponding increase, accords with daily speaker to the demand of higher volume.
TABLE 2-2 vibration film harmonic distortion (THD) test table
As can be seen from the above table 2-2, the values of the test table are the distortion rate (in%) of the auditory sensation conversion at the same frequency range for the comparative group and the experimental group. The lower the distortion ratio is, the weaker the resonance is, so that the sensitivity and the compliance of the vibrating diaphragm are better. From the diaphragm harmonic distortion (THD) test table it can be seen that: 1. the novel vibrating diaphragm that this application provided is under the condition that bears the same power/voltage value with current vibrating diaphragm (consult comparison group and experimental group 1), and the distortion factor of novel vibrating diaphragm compares slightly low in the distortion factor of current vibrating diaphragm under the same frequency range, and the novel vibrating diaphragm of this application all has in sensitivity and compliance and is superior to current vibrating diaphragm promptly. 2. Under the condition of different power/voltage values (refer to experiment group 1, experiment group 2 and experiment group 3), the novel vibrating diaphragm bears higher power/voltage value to enable the distortion rate to be higher, but the comparison between the experiment group 3 and the comparison group is obtained, and the novel vibrating diaphragm can still maintain the distortion rate with smaller difference under the condition that the power/voltage value (4W/4.9V) is more different than the power/voltage value (1.5W/3V) of the existing vibrating diaphragm, so that the structural stability of the novel vibrating diaphragm is fully illustrated, and better sensitivity and compliance are kept. 3. The frequency range value reaches more than 1000HZ, the distortion rate of the test group is mostly smaller than that of the comparison group, and the distortion rate phase difference is relatively close under different power/voltage values, so that the use condition of the loudspeaker under high frequency is satisfied.
Example 2
Referring to fig. 11, the present embodiment provides a speaker, which includes the novel diaphragm provided in embodiment 1 and an outer bracket 7 for supporting and protecting the novel diaphragm. The outer support 7 and the novel vibrating diaphragm enclose a containing cavity for placing a magnetic circuit system.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention.
Claims (9)
1. The novel vibrating diaphragm is characterized by comprising a vibrating plate and a flexible plate which is matched and attached with the vibrating plate; the vibrating plate comprises a ball top, a folded ring part arranged around the periphery of the ball top and an extension part arranged outside the folded ring part in a surrounding manner, and the folded ring part protrudes towards one side far away from the bonding position of the vibrating plate and the flexible plate; the flexible board comprises a central board for providing rigidity, a border part which is adhered to the outer extension part, and a plurality of support bars which are connected between the central board and the border part; an annular cavity is formed between the central plate and the frame part; the support bars are arranged in the annular cavity, and the central plate, the frame parts and the support bars are all arranged in a coplanar manner;
wherein the folded ring part is provided with an outer ring arc edge and an inner ring arc edge; the outer extension part is matched with the frame part, and the frame part is attached to the area outside the arc edge of the outer ring; the top of the ball is matched with the central plate, and the central plate is attached to the inner area of the inner ring arc edge;
the frame part comprises two second long sides which are arranged opposite to the first long sides and two second short sides which are arranged opposite to the first short sides and correspond to the first short sides.
2. The novel diaphragm of claim 1, wherein the junctions of the first long side and the first short side, and the junctions of the second long side and the second short side are provided with rounded corners.
3. The novel diaphragm of claim 2, wherein two of said first long sides and two of said first short sides define an inner ring, two of said second long sides and two of said second short sides define an outer ring, and said outer ring and said inner ring define therebetween said annular cavity.
4. The novel diaphragm of claim 3, wherein a plurality of support bars are regularly disposed between the center plate and the frame portion, each support bar includes a first bending portion, a second bending portion, and a transition portion connecting the first bending portion and the second bending portion, the first bending portion and the second bending portion are respectively disposed at two ends of the transition portion, the first bending portion is connected to the outer ring, the second bending portion is connected to the inner ring, and the transition portion and the first long side or the first short side of the location are disposed parallel to each other.
5. The diaphragm of claim 4, wherein the center plate is rectangular, and the rim portions are disposed on the outer side of the center plate at equal intervals; the annular cavity comprises two first areas close to the first long side of the central plate and two second areas close to the first short side of the central plate, the two first areas are symmetrically arranged, the two second areas are symmetrically arranged, and the first areas and the second areas are communicated with each other; each region is provided with a group of support bars which are symmetrically arranged, the two first bending parts of each group of support bars are far away from each other along the symmetry line of the support bars, and the two second bending parts of each group of support bars are close to each other along the symmetry line of the support bars.
6. The novel diaphragm of claim 1, wherein the flexible plate is integrally formed; the flexible board is made of polyetherimide material.
7. The novel diaphragm of claim 6, wherein the diaphragm is formed by a profile through air pressure forming and hot press forming, and comprises the following steps:
placing a mould on a forming table, and placing the profile in the mould;
heating the die to a first temperature, and introducing high-pressure gas into the die for 15-25s;
heating the die to a second temperature for 100-140s, maintaining the second temperature, and preserving the temperature for 30-50s;
cooling the die to a third temperature for 30-50s;
and opening the mould, and taking out the vibrating plate after the mould is lifted.
8. The diaphragm of claim 7, wherein the mold has a pneumatic cavity for molding the diaphragm, the molding table has a pressing plate, the pressing plate is provided with a heating pipeline for providing molding temperature and two cooling channels respectively arranged on the upper side and the lower side of the heating pipeline, the heating pipeline is arranged at intervals from the cooling channels, the heating pipeline is used for introducing hot steam, the cooling channels are used for introducing cooling liquid, and the heating pipeline and the cooling channels each comprise two bent pipelines which are symmetrically arranged left and right, and each bent pipeline is formed by connecting a plurality of S-shaped pipelines.
9. A loudspeaker, comprising the novel vibrating diaphragm according to any one of claims 1 to 8 and an outer support for supporting and protecting the novel vibrating diaphragm, wherein the outer support and the novel vibrating diaphragm enclose a containing cavity for placing a magnetic circuit system.
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