Forming process and forming device for belt type high-pitch vibrating diaphragm with arc-shaped structure

Abstract

The invention discloses a forming process and a forming device for a belt type high-pitch vibrating diaphragm with an arc-shaped structure. The forming process comprises the following steps: step 1, preparing a semi-finished vibrating diaphragm; cutting the metal foil to form a metal circuit layer, and attaching the metal circuit layer to the base layer; step 2, forming a wave-shaped vibrating diaphragm; providing the folding device; folding the semi-finished vibrating diaphragm into a wave-shaped structure; step 3, pressing and assembling; the positioning device is provided, and the folded and formed wave-shaped vibrating diaphragm and the outer frame are assembled and fixed. The diaphragm prepared by the invention has extremely high frequency response and excellent tone quality performance in performance. And the production cost can be saved in process manufacturing, the structural design of the shape of the product can also enable the product to have better sound listening performance, and a plurality of different materials and different product shapes can be combined and matched. The high-frequency ductility of the vibrating diaphragm is better, the distortion rate is lower, and the horizontal directivity is wide. And the product has the characteristics of flexibility, diversification and customization.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm processing, and in particular to a forming process and a forming device of a belt-type tweeter diaphragm with an arc structure. Background Art

[0002] The shape of a conventional ribbon tweeter diaphragm is basically square, and the circuit is produced by chemical etching on a polyimide (PI) material. However, the range of material selection for a ribbon tweeter diaphragm with this structure is very limited, and only polyimide (PI) material can be used for circuit etching. In addition, the material and shape of conventional ribbon tweeter diaphragms are relatively simple, and the driving range and effective sounding area of ​​the diaphragm are small, which makes the product's use effect poor. Summary of the invention

[0003] Based on this, it is necessary to provide a ribbon tweeter diaphragm forming process and a forming device with an arc structure in order to address the deficiencies in the prior art.

[0004] A forming device for a ribbon tweeter diaphragm with an arc structure comprises a pressing device, a laser device, a folding device, a cutting device and a positioning device, wherein the laser device cuts a metal foil to form a metal circuit layer; the pressing device hot presses the metal circuit layer and bonds it to a base layer; the folding device folds the pressed product into a wavy shape; the cutting device cuts the wavy diaphragm into a required shape, and the positioning device assembles the wavy diaphragm and an outer frame; the folding device comprises a first folding device and a corresponding second folding device, and a plurality of folding patches are arranged on opposite sides of the first folding device and the second folding device. The folding patches on the first folding device and the second folding device are arranged in parallel and staggered manner; the semi-finished diaphragm is placed between the first folding device and the second folding device, and the folding patches between the two are respectively embedded in the gap between the two folding patches of each other, so as to fold the semi-finished diaphragm into a wavy structure; the positioning device includes an upper mold and a lower mold arranged directly below it, a boss is arranged on the bottom surface of the upper mold, and a plurality of long grooves are arranged on the bottom surface of the boss; a limiting groove is arranged on the top surface of the lower mold, and a plurality of convex strips arranged side by side are arranged in the middle of the limiting groove; the boss and the limiting groove are arranged correspondingly up and down, and the convex strips are embedded in the corresponding long grooves.

[0005] Furthermore, the first folding device and the second folding device are arranged correspondingly on the left and right, and the folding patch is arranged to extend horizontally.

[0006] Furthermore, the first folding device and the second folding device both include a vertically extending mounting plate, the folding patch is arranged on the inner side surfaces of the two mounting plates, and the inner free end surface of the folding patch is arranged in an arc shape.

[0007] Furthermore, the first folding device and the second folding device are further provided with a non-folding area outside the folding patch area.

[0008] Furthermore, the first folding device and the second folding device are arranged opposite to each other in the upper and lower directions, and the folding patch is arranged on the bottom surface of the first folding device and the top surface of the second folding device, and the folding patch is arranged to extend vertically.

[0009] A process for forming a ribbon tweeter diaphragm with an arc structure comprises the following steps:

[0010] Step 1: prepare a semi-finished diaphragm; cut the metal foil into a metal circuit layer, and laminate the metal circuit layer onto the base layer;

[0011] Step 2, forming a wavy diaphragm; providing the folding device; placing the semi-finished diaphragm between the first folding device and the second folding device, with the folding patches between the two facing the gap between the two folding patches of the other party, and folding the semi-finished diaphragm into a wavy structure;

[0012] Step three, press-fit assembly; provide the positioning device, cut the folded and formed wavy semi-finished diaphragm into the required shape, apply glue to the fitting area of ​​the semi-finished diaphragm and place it in the limiting groove of the lower mold; the boss and the limiting groove are arranged correspondingly up and down, the convex strip is embedded in the corresponding long groove, the outer frame is placed above the fitting area in the limiting groove, and the middle part of the folding area of ​​the diaphragm is placed between the convex strip and the long groove to assemble and fix the outer frame and the diaphragm.

[0013] Furthermore, in step one, a protective film is firstly laminated on one side of the metal foil, and then an adhesive layer is coated on the surface of the metal foil. After the surface adhesive layer is dried, a laser process is used to carve a pattern into a metal circuit layer; the metal circuit layer is heated and bonded to the base layer using a molding device, and then the protective film of the metal circuit layer is torn off.

[0014] Furthermore, in step one, a glue layer is coated on both the upper and lower sides of the metal circuit layer, and a base layer is respectively attached to the upper and lower sides of the metal circuit layer to form a Sanmingye type semi-finished diaphragm structure.

[0015] Furthermore, in step two, when the first folding device and the second folding device are an upper and lower structure, both sides of the semi-finished diaphragm need to extend out of the folding patch without folding and forming to form a fitting area structure.

[0016] In summary, the present invention adopts a special diaphragm structure and a design of a cut metal circuit board structure, so that the diaphragm has more advantageous materials in material selection, and a polymer material (one or more composites of PEEK, PEI, and PU) that is lighter than polyimide (PI) materials can be used, so that the diaphragm has better high-frequency ductility, lower distortion, and has the advantage of wide horizontal directivity. The semi-finished diaphragm is folded using an accordion loose-leaf folding device, which not only has high work efficiency and product quality, but also allows the diaphragm to be round or elliptical after assembly, rather than limited to the traditional square shape. The product is made flexible, diversified, and customized. The diaphragm prepared by the present invention has extremely high frequency response and excellent sound quality performance in terms of performance. The difference in process manufacturing can save production costs, and the structural design of the product shape can also make the product perform better in terms of listening, and a variety of different materials and different product shapes can be used in combination. It is highly practical and has promotional significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a ribbon tweeter diaphragm with an arc structure according to the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional schematic diagram of

[0019] Figure 3 Schematic diagram of two different structures of the substrate;

[0020] Figure 4 It is a partial structural schematic diagram of the folding device;

[0021] Figure 5 is a schematic diagram of the structure of the positioning device;

[0022] Figure 6 for Figure 5 A structural schematic diagram of the positioning device from another perspective;

[0023] Figure 7 is a schematic diagram of the cross-sectional structure of the positioning device;

[0024] Figure 8 and Fig. 9 It is a comparison diagram of the high-frequency sound pressure level curve and the distortion curve of the traditional PI diaphragm and the ribbon tweeter diaphragm in the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the invention more clearly understood, the invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and are not used to limit the invention.

[0026] like Figure 1 to Figure 2As shown, the present invention provides a ribbon tweeter diaphragm with an arc structure, the ribbon tweeter diaphragm with an arc structure comprises a diaphragm 10 and an outer frame 20 surrounding the outside of the diaphragm 10, the cross section of the diaphragm 10 is arranged in a wave shape, the diaphragm 10 comprises a wave-shaped folding area 101 in the middle and a fitting area 102 arranged outside the folding area 101, a plurality of convex strips are arranged side by side on the folding area 101, and the protrusion directions of adjacent convex strips are opposite. Grooves 21 are arranged on two opposite sides of the outer frame 20, and the grooves 21 extend inwardly to the fitting area 102 of the diaphragm 10. The fitting area 102 is fitted to one side end face of the outer frame 20, and the folding area 101 is accommodated in the inner cavity of the outer frame 20.

[0027] The diaphragm 10 includes a base layer 12 and a metal circuit layer 13 disposed on the base layer 12, and the metal circuit layer 13 is adhered to the base layer 12 through an adhesive layer 14. In this embodiment, the metal circuit layer 13 is a metal sheet punched or laser engraved from a metal material. In this embodiment, the material of the metal circuit layer 13 is aluminum foil or copper foil. The material of the base layer 12 is a composite of one or more materials selected from PEEK, PEI, and PU; more specifically, the base layer 12 is a composite of multiple layers of different materials.

[0028] In another embodiment, the diaphragm 10 includes a metal circuit layer 13 and a base layer 12 disposed on the upper and lower sides of the metal circuit layer 13 , and the metal circuit layer 13 and the base layer 12 are bonded by an adhesive layer 14 .

[0029] The aforementioned process for forming a ribbon tweeter diaphragm with an arc-shaped structure specifically comprises the following steps:

[0030] Step 1: preparing a semi-finished diaphragm;

[0031] A protective film is laminated on one side of the metal foil, and then a glue layer is coated on the surface of the metal foil. After the surface glue layer is dried, a laser process is used to carve out the pattern to remove excess waste. The carved metal circuit layer 13 is heated and bonded to the base layer 12 using a molding device, and then the protective film of the metal circuit layer 13 is torn off.

[0032] In addition, in another embodiment, a glue layer may be coated on the upper and lower sides of the metal circuit layer 13, and the base layer 12 may be attached to the upper and lower sides of the metal circuit layer 13 respectively to form a semi-finished diaphragm structure of a Sanmingye structure.

[0033] Step 2: forming a wavy diaphragm;

[0034] A folding device 30 is provided, and the folding device 30 includes a first folding device 31 and a second folding device 32 which are arranged relatively to each other. In the present embodiment, the first folding device 31 and the second folding device 32 are arranged to be aligned left and right. The first folding device 31 and the second folding device 32 are molded together to mold the semi-finished diaphragm into a wavy diaphragm structure, or are separated to take out the molded product.

[0035] The first folding device 31 and the second folding device 32 both include a mounting plate and a plurality of folding patches 311 disposed on the mounting plate. The mounting plate 311 is disposed vertically, and the plurality of folding patches 311 are disposed horizontally and are arranged in a row and connected to the inner side surface of the mounting plate 311. The folding patches 311 on the first folding device 31 and the second folding device 32 are disposed on opposite sides of the two mounting plates. The inner free end surface of the folding patch 311 is disposed in an arc shape, and its curvature is consistent with the curvature of the protrusion at the corresponding position of the diaphragm. The folding patches 311 on the first folding device 31 and the second folding device 32 are disposed in parallel and staggered manner, and the spacing between the two folding patches 311 on the same folding device is greater than the thickness of the folding patch 311 on the other folding device; thus, they can be folded and crossed to form an overlapping area.

[0036] In addition, the first folding device 31 and the second folding device 32 can be arranged correspondingly up and down, or horizontally arranged correspondingly left and right. The folding patch 311 on the first folding device 31 and the second folding device 32 can be folded left and right or molded up and down. The first folding device 31 and the second folding device 32 are provided with a non-folding area outside the folding patch 311 area, and the outer periphery of the plate-shaped semi-finished diaphragm extends from the folding patch 311 area to form the above-mentioned bonding area 102.

[0037] During operation, the semi-finished diaphragm is first placed between the first folding device 31 and the second folding device 32, and its outer edge extends out of the folding device. The first folding device 31 and the second folding device 32 are molded together to clamp the semi-finished diaphragm between the two. The inner end portions of the first folding device 31 and the second folding device 32 are crossed, and the adjacent folding patches 311 fold the semi-finished diaphragm up and down in turn, so that the semi-finished diaphragm forms a wavy structure. The crossing and overlapping length of the first folding device 31 and the second folding device 32 is the peak height of the wavy structure, which can be adjusted according to demand; the higher the wave-shaped arch, the longer the overlapping area; otherwise, it is shorter.

[0038] Step 3: Pressing and assembling;

[0039] A positioning device 40 is provided, and the positioning device 40 includes an upper mold 41 and a lower mold 42 arranged directly below the upper mold 41. A boss 411 is arranged on the bottom surface of the upper mold 41, and a plurality of long grooves 412 are arranged on the bottom surface of the boss 411. A limiting groove 421 is arranged on the top surface of the lower mold 42, and a plurality of convex strips 422 arranged side by side are arranged in the middle of the limiting groove 421. The folded and formed wavy substrate is cut into the required shape, and glue is applied on the upper surface of the diaphragm bonding area 102, and the diaphragm is placed in the limiting groove 421 of the lower mold 42. The boss 411 and the limiting groove 421 are arranged correspondingly up and down, and the convex strips 422 are embedded in the corresponding long grooves 412. The outer frame 20 is placed above the diaphragm bonding area 102 in the limiting groove 421, and the middle folding portion 101 is placed between the convex strips 422 and the long grooves 412. To ensure the bonding stability, glue can be added at the connection position of the two, and then pressed together to assemble and fix the outer frame 20 and the diaphragm 10.

[0040] In addition, the present invention also discloses a forming device for a belt-type tweeter diaphragm with an arc-shaped structure, wherein the forming device for a belt-type tweeter diaphragm with an arc-shaped structure comprises a pressing device (not shown), a laser device (not shown), a folding device 30, a cutting device (not shown) and a positioning device 40, wherein the laser device is a conventional device, which is used to process metal foil so that the metal foil forms a metal circuit layer 13. The pressing device is a conventional hot pressing forming device, which is used to hot press the metal circuit layer 13 and adhere it to the semi-finished diaphragm. The folding device 30 folds the pressed product into a wavy shape; the cutting device is a conventional device that can realize the cutting function, and is used to cut the wavy diaphragm into a required shape. The positioning device 40 assembles and forms the wavy diaphragm 10 and the outer frame 20.

[0041] The folding device 30 includes a first folding device 31 and a second folding device 32 which are arranged relatively to each other. In the present embodiment, the first folding device 31 and the second folding device 32 are arranged to be aligned left and right. The first folding device 31 and the second folding device 32 are molded together to mold the semi-finished diaphragm into a wavy diaphragm structure, or are separated to take out the molded product.

[0042] The first folding device 31 and the second folding device 32 both include a mounting plate and a plurality of folding patches 311 disposed on the mounting plate. The mounting plate 311 is disposed vertically, and the plurality of folding patches 311 are disposed horizontally and are arranged in a row and connected to the inner side surface of the mounting plate 311. The folding patches 311 on the first folding device 31 and the second folding device 32 are disposed on opposite sides of the two mounting plates. The inner free end surface of the folding patch 311 is disposed in an arc shape, and its curvature is consistent with the curvature of the protrusion at the corresponding position of the diaphragm. The folding patches 311 on the first folding device 31 and the second folding device 32 are disposed in parallel and staggered manner, and the spacing between the two folding patches 311 on the same folding device is greater than the thickness of the folding patch 311 on the other folding device; thus, they can be folded and crossed to form an overlapping area.

[0043] In addition, the first folding device 31 and the second folding device 32 can be arranged correspondingly up and down, or horizontally arranged correspondingly left and right. The folding patch 311 on the first folding device 31 and the second folding device 32 can be folded left and right or molded up and down. The first folding device 31 and the second folding device 32 are provided with a non-folding area outside the folding patch 311 area, and the outer periphery of the plate-shaped semi-finished diaphragm extends from the folding patch 311 area to form the above-mentioned bonding area 102.

[0044] During operation, the semi-finished diaphragm is first placed between the first folding device 31 and the second folding device 32, and its outer edge extends out of the folding device. The first folding device 31 and the second folding device 32 are molded together to clamp the semi-finished diaphragm between the two. The inner end portions of the first folding device 31 and the second folding device 32 are crossed, and the adjacent folding patches 311 fold the semi-finished diaphragm up and down in turn, so that the semi-finished diaphragm forms a wavy structure. The crossing and overlapping length of the first folding device 31 and the second folding device 32 is the peak height of the wavy structure, which can be adjusted according to demand; the higher the wave-shaped arch, the longer the overlapping area; otherwise, it is shorter.

[0045] The positioning device 40 includes an upper mold 41 and a lower mold 42 arranged directly below the upper mold 41. A boss 411 is arranged on the bottom surface of the upper mold 41, and a plurality of long grooves 412 are arranged on the bottom surface of the boss 411. A limiting groove 421 is arranged on the top surface of the lower mold 42, and a plurality of convex strips 422 arranged side by side are arranged in the middle of the limiting groove 421. The folded and formed wavy substrate is cut into the required shape, and the substrate is placed in the limiting groove 421 of the lower mold 42. The boss 411 and the limiting groove 421 are arranged correspondingly up and down, and the convex strips 422 are embedded in the corresponding long grooves 412. The outer frame 20 is placed in the limiting groove 421, and the outer end of the diaphragm 10 is embedded in the outer frame, and the middle part is placed between the convex strips 422 and the long grooves 412. Adhesive is dripped at the connection position between the two to assemble and fix the outer frame 20 and the diaphragm 10.

[0046] like Figure 8 and Fig. 9 As shown, there are three experimental curve comparison charts of the traditional PI material diaphragm 60, the ribbon tweeter diaphragm 61 with a PEEK base material, and the ribbon tweeter diaphragm 62 with a PU base material in the present invention. Among them, the traditional PI material diaphragm 60 has a high frequency of 4.7kHz; the PEEK ribbon tweeter diaphragm 61 has a high frequency of 1.2kHz; the PU material ribbon tweeter diaphragm 62 has a high frequency of 1.1kHz. From the above comparison, it can be seen that the high-frequency extension performance of the ribbon tweeter diaphragms made of PEEK and PU materials in the present invention is better, and the high frequency can be made lower, which is also very advantageous for the distortion performance of the product.

[0047] In summary, the present invention adopts a special diaphragm structure and a design of a cut metal circuit board structure, so that the diaphragm has more advantageous materials in material selection, and a polymer material (one or more composites of PEEK, PEI, and PU) that is lighter than polyimide (PI) materials can be used, so that the diaphragm has better high-frequency ductility, lower distortion, and has the advantage of wide horizontal directivity. The semi-finished diaphragm is folded using an accordion loose-leaf folding device, which not only has high work efficiency and product quality, but also allows the diaphragm to be round or elliptical after assembly, rather than limited to the traditional square shape. The product is made flexible, diversified, and customized. The diaphragm prepared by the present invention has extremely high frequency response and excellent sound quality performance in terms of performance. The difference in process manufacturing can save production costs, and the structural design of the product shape can also make the product perform better in terms of listening, and a variety of different materials and different product shapes can be used in combination. It is highly practical and has promotional significance.

[0048] The above-mentioned embodiments only express some implementation methods of the invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the inventive concept, which all belong to the protection scope of the invention. Therefore, the protection scope of the invention patent shall be based on the attached claims.

Claims

1. A molding device for a ribbon tweeter diaphragm having an arc-shaped structure, characterized in that: It includes a laminating device, a laser device, a folding device, a cutting device and a positioning device. The laser device cuts the metal foil to form a metal circuit layer; the laminating device hot presses the metal circuit layer and adheres it to the base layer; The folding device folds the pressed product into a wavy shape; the cutting device cuts the wavy diaphragm into the required shape, and the positioning device assembles the wavy diaphragm and the outer frame; the folding device includes a first folding device and a corresponding second folding device, and a plurality of folding patches are arranged on the opposite sides of the first folding device and the second folding device, and the folding patches on the first folding device and the second folding device are arranged in parallel and staggered; the semi-finished diaphragm is placed between the first folding device and the second folding device, and the folding patches between the two are respectively embedded in the gap between the two folding patches of the other party, so as to fold the semi-finished diaphragm into a wavy structure; the positioning device includes an upper mold and a lower mold arranged directly below it, a boss is arranged on the bottom surface of the upper mold, and a plurality of long grooves are arranged on the bottom surface of the boss; a limiting groove is arranged on the top surface of the lower mold, and a plurality of convex strips arranged side by side are arranged in the middle of the limiting groove; the boss and the limiting groove are arranged correspondingly up and down, and the convex strips are embedded in the corresponding long grooves.

2. The molding device of the ribbon tweeter diaphragm with an arc structure as claimed in claim 1, characterized in that: The first folding device and the second folding device are arranged correspondingly on the left and right, and the folding patch is arranged to extend horizontally.

3. A ribbon tweeter diaphragm forming device with an arc structure as claimed in claim 2, characterized in that: The first folding device and the second folding device both include a vertically extending mounting plate, the folding patch is arranged on the inner side surfaces of the two mounting plates, and the inner free end surface of the folding patch is arranged in an arc shape.

4. The arc-shaped ribbon tweeter diaphragm forming device according to claim 2, characterized in that: The first folding device and the second folding device are further provided with a non-folding area outside the folding patch area.

5. The ribbon tweeter diaphragm forming device with an arc structure as claimed in claim 1, characterized in that: The first folding device and the second folding device are arranged opposite to each other in the upper and lower directions. The folding patch is arranged on the bottom surface of the first folding device and the top surface of the second folding device, and the folding patch is arranged to extend vertically.

6. A process for forming a ribbon tweeter diaphragm with an arc structure, characterized in that: The steps include: Step 1: prepare a semi-finished diaphragm; cut the metal foil into a metal circuit layer, and laminate the metal circuit layer onto the base layer; Step 2, forming a wavy diaphragm; providing a folding device as described in any one of claims 1 to 5; placing the semi-finished diaphragm between the first folding device and the second folding device, with the folding patches between the two folding patches respectively facing the gap between the two folding patches of the other party, and folding the semi-finished diaphragm into a wavy structure; Step three, press-fit assembly; provide the positioning device described in claim 1, cut the folded wavy semi-finished diaphragm into the required shape, and place the bonding area of ​​the semi-finished diaphragm in the limiting groove of the lower mold after gluing; the boss and the limiting groove are arranged correspondingly up and down, the convex strip is embedded in the corresponding long groove, the outer frame is placed above the bonding area in the limiting groove, and the middle part of the folding area of ​​the diaphragm is placed between the convex strip and the long groove to assemble and fix the outer frame and the diaphragm.

7. The process for forming a ribbon tweeter diaphragm with an arc structure as claimed in claim 1, characterized in that: In step one, a protective film is first laminated on one side of the metal foil, and then an adhesive layer is coated on the surface of the metal foil. After the surface adhesive layer is dried, a laser process is used to carve a pattern into a metal circuit layer. The metal circuit layer is heated and bonded to the base layer using a molding device, and then the protective film of the metal circuit layer is torn off.

8. The process for forming a ribbon tweeter diaphragm with an arc structure as claimed in claim 1, characterized in that: In step one, a glue layer is coated on both the upper and lower sides of the metal circuit layer, and a base layer is respectively attached to the upper and lower sides of the metal circuit layer to form a Sanmingye type semi-finished diaphragm structure.

9. The process for forming a ribbon tweeter diaphragm with an arc structure as claimed in claim 1, characterized in that: In step 2, when the first folding device and the second folding device are an upper and lower structure, both sides of the semi-finished diaphragm need to extend out of the folding patch without folding and forming to form a bonding area structure.

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