Lens telescopic support and manufacturing method thereof

Abstract

The invention belongs to the technical field of mobile communication equipment, and particularly relates to a manufacturing method of a lens telescopic support, which comprises the following steps: providing a first metal sheet and a second metal sheet, forming an inner hole in the first metal sheet, reducing the size of the second metal sheet in equal proportion relative to the size of the inner hole, placing the second metal sheet in the inner hole, spraying a first glue layer on the surface, close to the inner ring of the inner hole, of the first metal sheet, and spraying a second glue layer on the surface, close to the outer ring, of the second metal sheet; the first metal sheet and the second metal sheet are placed in an injection mold, a silica gel ring is injected, the surface, close to the outer ring, of the silica gel ring is bonded with the first metal sheet through a first glue layer, and the surface, close to the inner ring, of the silica gel ring is bonded with the second metal sheet through a second glue layer; and punching the first metal sheet, the silica gel ring and the second metal sheet which are bonded together to form the lens telescopic support comprising an outer metal ring, a silica gel ring and an inner metal ring. The lens telescopic support provided by the invention has excellent waterproof performance and durability.

Description

Technical Field

[0001] The invention belongs to the technical field of mobile communication equipment, and in particular relates to a telescopic lens bracket and a manufacturing method thereof. Background Art

[0002] As the imaging quality of existing camera modules continues to improve, the size of photosensitive chips continues to increase, and the height of the molds also continues to increase. When they are assembled into terminal devices for imaging, on the one hand, the thickness of the entire terminal will increase, and on the other hand, it will also affect its light intake; in addition, because the camera module needs to be frequently extended and retracted, it is bound to have higher requirements for its waterproof performance and durability. Therefore, how to achieve a miniaturized camera module with high waterproof performance and durability is the focus of current industry research and development. Summary of the invention

[0003] The object of the present invention is to provide a telescopic lens bracket and a manufacturing method thereof, aiming to solve one of the above-mentioned technical problems in the prior art.

[0004] To achieve the above object, an embodiment of the present invention provides a method for manufacturing a telescopic lens bracket, comprising the following steps:

[0005] S100: providing a first metal sheet and a second metal sheet, wherein the first metal sheet is provided with an inner hole, and the size of the second metal sheet is proportionally reduced relative to the size of the inner hole, placing the second metal sheet in the inner hole, spraying a first glue layer on a surface of the first metal sheet close to the inner circle of the inner hole, and spraying a second glue layer on a surface of the second metal sheet close to the outer circle;

[0006] S200: placing the first metal sheet and the second metal sheet in an injection mold and injecting a silicone ring, wherein a surface of the silicone ring close to its outer ring is bonded to the first metal sheet through the first glue layer, and a surface of the silicone ring close to its inner ring is bonded to the second metal sheet through the second glue layer;

[0007] S300: Punching and cutting the first metal sheet, the silicone ring and the second metal sheet that are bonded together to form a telescopic lens bracket including an outer metal ring, the silicone ring and an inner metal ring.

[0008] Preferably, in the step S100, a glue spraying jig is provided, the glue spraying jig comprises an upper mold and a lower mold, the lower mold is provided with a first positioning column and a second positioning column, and the upper mold is provided with a glue spraying hole;

[0009] The first metal sheet is provided with a first positioning hole, the second metal sheet is provided with a second positioning hole, the first metal sheet and the second metal sheet are both placed on the lower mold, and the first positioning column is matched with the first positioning hole, and the second positioning column is matched with the second positioning hole;

[0010] The upper mold is placed above the lower mold and covers the first metal sheet and the second metal sheet, and the glue spraying hole is directly opposite to the surface of the first metal sheet close to the inner circle of the inner hole and the surface of the second metal sheet close to the outer circle;

[0011] The glue is sprayed onto the surfaces of the first metal sheet and the second metal sheet through the glue spraying holes by a glue dispensing machine, and the first glue layer and the second glue layer are formed respectively.

[0012] Preferably, the glue spraying jig also includes a material picking fork, which includes a handle and a plurality of support bars extending from one end of the handle and arranged at intervals, and the lower mold is provided with a plurality of support ridges arranged at intervals, and the first positioning column and the second positioning column are both provided on the support ridges, and each of the support bars is respectively inserted into two adjacent support ridges, and the first metal sheet and the second metal sheet can be taken out of the lower mold by lifting the handle upwards.

[0013] Preferably, in the step S200, after the silicone ring bonding the first metal sheet and the second metal sheet is injection molded, a bamboo stick wrapped with a dust-free cloth and dipped in alcohol is used to wipe the overflowed glue of the silicone ring back and forth.

[0014] Preferably, after the step S300, the method further comprises a step S400: performing laser lithography on the surface of the telescopic lens bracket to form an engraved surface on the surface of the outer metal ring and / or the inner metal ring.

[0015] Preferably, after step S400, step S500 is also included: using a detergent to clean the telescopic lens bracket for the first time, and after the first cleaning, washing and baking at 150°C for about 20-30 minutes; using clean water to clean the telescopic lens bracket for the second time, and after the second cleaning, washing and baking at 150°C for about 20-30 minutes.

[0016] Preferably, the silicone ring includes an outer ring flat plate portion, an intermediate connecting portion and an inner ring flat plate portion which are integrally formed, the outer ring flat plate portion and the inner ring flat plate portion are respectively connected to the two ends of the intermediate connecting portion, the outer ring flat plate portion is bonded to the surface of the outer ring metal ring, and the inner ring flat plate portion is bonded to the surface of the inner ring metal ring.

[0017] Preferably, the cross-section of the intermediate connecting portion is U-shaped or Z-shaped.

[0018] Preferably, the outer ring flat plate portion and the inner ring flat plate portion are at the same height level or at different height levels.

[0019] An embodiment of the present invention further provides a telescopic lens bracket, which is manufactured using the above-mentioned manufacturing method of the telescopic lens bracket.

[0020] The above one or more technical solutions in the telescopic lens bracket and the manufacturing method thereof provided by the embodiments of the present invention have at least one of the following technical effects: In the present invention, the first metal sheet is arranged in the inner hole of the second metal sheet, and then the first metal sheet and the second metal sheet are connected together by injection molding of a silicone ring, and then a punching process is performed to form a telescopic lens bracket including an outer metal ring, the silicone ring and an inner metal ring. In the telescopic lens bracket of the present invention, the connection between the outer metal ring, the silicone ring and the inner metal ring is stable and reliable, and the waterproof performance is excellent. In addition, because of the setting of the silicone ring, it can effectively ensure that the telescopic performance of the telescopic lens bracket will not be affected by repeated telescoping, and the durability is extremely high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic structural diagram of a telescopic lens bracket provided in an embodiment of the present invention.

[0023] Figure 2 for Figure 1 Cutaway view of the lens telescoping bracket in .

[0024] Figure 3 A schematic structural diagram of another telescopic lens bracket provided in an embodiment of the present invention.

[0025] Figure 4 for Figure 3 Cutaway view of the lens telescoping bracket in .

[0026] Figure 5 A schematic structural diagram of a glue spraying jig for a method for manufacturing a telescopic lens bracket provided in an embodiment of the present invention.

[0027] Figure 6 for Figure 5 Exploded view of the glue spraying fixture.

[0028] Figure 7 for Figure 5 A top view of the glue spraying fixture in Figure 2.

[0029] Figure 8 A structural schematic diagram of placing a second metal sheet in an inner hole of a first metal sheet in a manufacturing method of a telescopic lens bracket provided by an embodiment of the present invention.

[0030] Fig. 9 The present invention is a flowchart of a method for manufacturing a telescopic lens bracket according to an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 10—outer metal ring 20—inner metal ring 30—silicone ring

[0033] 31 - outer ring flat plate 32 - inner ring flat plate 33 - middle connecting part

[0034] 40—Spraying fixture 41—Upper mold 42—Lower mold

[0035] 43—feeding fork 100—first metal sheet 101—first glue layer

[0036] 102—first positioning hole 110—inner hole 200—second metal sheet

[0037] 201—Second glue layer 202—Second positioning hole 411—Glue spraying hole

[0038] 420—support ridge 421—first positioning column 422—second positioning column

[0039] 431 - handle 432 - support bar. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 9 The described embodiments are exemplary and are intended to be used to explain the embodiments of the present invention, but should not be construed as limiting the present invention.

[0041] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] In one embodiment of the present invention, Fig. 9 As shown, a method for manufacturing a telescopic lens bracket is provided, comprising the following steps:

[0045] S100: Provide a first metal sheet 100 and a second metal sheet 200. The first metal sheet 100 is provided with an inner hole 110. The size of the second metal sheet 200 is proportionally reduced relative to the size of the inner hole 110. Place the second metal sheet 200 in the inner hole 110. For further information, see Figure 6 A first glue layer 101 is sprayed on the surface of the first metal sheet 100 near the inner circle of the inner hole 110, and a second glue layer 201 is sprayed on the surface of the second metal sheet 200 near the outer circle thereof; it should be noted that the size of the second metal sheet 200 is proportionally reduced relative to the size of the inner hole 110, which means, for example, that the inner hole 110 is a circular hole, then the second metal sheet 200 is a circular sheet, and the aperture of the inner hole 110 is larger than the outer diameter of the second metal sheet 200, so that the second metal sheet 200 can be placed in the inner hole 110 and can be concentrically arranged with the inner hole 110, see further Figure 8 Similarly, the inner hole 110 may also be a square hole, and then the second metal sheet 200 is a square sheet, and the principle is the same.

[0046] S200: placing the first metal sheet 100 and the second metal sheet 200 in an injection mold and injecting a silicone ring 30, wherein the surface of the silicone ring 30 close to its outer circle is bonded to the first metal sheet 100 through the first glue layer 101, and the surface of the silicone ring 30 close to its inner circle is bonded to the second metal sheet 200 through the second glue layer 201;

[0047] S300: Punching and cutting the first metal sheet 100, the silicone ring 30 and the second metal sheet 200 bonded together to form a telescopic lens bracket including an outer metal ring 10, the silicone ring 30 and an inner metal ring 20. Figures 1 to 4 .

[0048] In the manufacturing method of the telescopic lens bracket provided in an embodiment of the present invention, the first metal sheet 100 is set in the inner hole 110 of the second metal sheet 200, and then the silicone ring 30 is injection-molded to connect the first metal sheet 100 and the second metal sheet 200 together, and then a punching process is performed to form a telescopic lens bracket including an outer metal ring 10, the silicone ring 30 and an inner metal ring 20.

[0049] The manufacturing method of the telescopic lens bracket of the embodiment of the present invention manufactures a star fixed telescopic lens bracket, wherein the connection among the outer metal ring 10, the silicone ring 30 and the inner metal ring 20 is stable and reliable, and the waterproof performance is excellent. Moreover, due to the provision of the silicone ring 30, it can effectively ensure that the telescopic performance of the telescopic lens bracket will not be affected by repeated extension and retraction, and the durability is extremely high.

[0050] In one embodiment of the present invention, Fig. 9 As shown, in the step S100, a glue spraying fixture 40 is provided, such as Figures 5 to 7 As shown, the glue spraying jig 40 includes an upper mold 41 and a lower mold 42, the lower mold 42 is provided with a first positioning column 421 and a second positioning column 422, and the upper mold 41 is provided with a glue spraying hole 411;

[0051] See further Figure 8 The first metal sheet 100 is provided with a first positioning hole 102, and the second metal sheet 200 is provided with a second positioning hole 202. The first metal sheet 100 and the second metal sheet 200 are both placed on the lower mold 42, and the first positioning column 421 is matched with the first positioning hole 102, and the second positioning column 422 is matched with the second positioning hole 202;

[0052] The upper mold 41 is placed above the lower mold 42 and covers the first metal sheet 100 and the second metal sheet 200. Figure 7 As shown, the glue spraying hole 411 is directly opposite to the surface of the first metal sheet 100 close to the inner circle of the inner hole 110 thereof and the surface of the second metal sheet 200 close to the outer circle thereof;

[0053] The glue is sprayed onto the surface of the first metal sheet 100 and the second metal sheet 200 through the glue spraying hole 411 by a glue dispenser, and the first glue layer 101 and the second glue layer 201 are formed respectively. Figure 8In this step, a set of glue spraying fixtures 40 specially adapted for glue dispensing is provided. First, the first metal sheet 100 and the second metal sheet 200 are positioned by the first positioning column 421 and the second column of the lower mold 42, and the first metal sheet 100 is located in the center of the inner hole 110 set in the second metal sheet 200. After completing the positioning of the first metal sheet 100 and the second metal sheet 200, the upper mold 41 is covered so that the upper mold 41 presses the first metal sheet 100 and the second metal sheet 200. Because a glue spraying hole 411 is provided on the upper mold 41, glue can be sprayed directly on the glue spraying hole 411 of the upper mold 41 to form a first glue layer 101 on the surface of the first metal sheet 100 near the inner circle of its inner hole 110, and a second glue layer 201 can be formed on the surface of the second metal sheet 200 near its outer circle. This can effectively ensure that the first glue layer 101 and the second glue layer 201 are produced on the first metal sheet 100 and the second metal sheet 200 at one time, with accurate positioning, high efficiency and reliability.

[0054] Further, see Figure 6 The glue spraying jig 40 also includes a material picking fork 43, which includes a handle 431 and a plurality of support bars 432 extending from one end of the handle 431 and arranged at intervals. The lower mold 42 is provided with a plurality of support ridges 420 arranged at intervals. The first positioning column 421 and the second positioning column 422 are both provided on the support ridges 420, and each of the support bars 432 is respectively inserted into two adjacent support ridges 420. After the handle 431 is lifted upward, the first metal sheet 100 and the second metal sheet 200 can be taken out of the lower mold 42. In this embodiment, after completing the production of the first glue layer 101 of the first metal sheet 100 and the second glue layer 201 of the second metal sheet 200, first open the upper mold 41, and then lift up the material picking fork 43 inserted between the supporting ridges 420 of the lower mold 42. At this time, the support bar 432 of the material picking fork 43 located between the supporting ridges 420 will support the first metal sheet 100 and the second metal sheet 200 located on the supporting ridges 420 during the upward movement. In this way, all the first metal sheets 100 and the second metal sheets 200 that have been sprayed with glue on the lower mold 42 can be taken out at one time. The material picking structure design is very clever and can effectively improve production efficiency.

[0055] In one embodiment of the present invention, in the step S200, after the silicone ring 30 bonding the first metal sheet 100 and the second metal sheet 200 is injection molded, a bamboo stick wrapped in a dust-free cloth and dipped in alcohol is used to wipe the overflowed glue of the silicone ring 30 back and forth. In the step S200, the overflowed glue generated during the injection molding of the silicone ring 30 is wiped by a bamboo stick wrapped in a dust-free cloth and dipped in alcohol, and defective products can also be found so that the defective products can be removed in time to improve the product yield.

[0056] In one embodiment of the present invention, Fig. 9 As shown, after step S300, step S400 is further included: lasering the surface of the telescopic lens bracket to form an engraved surface on the surface of the outer metal ring 10 and / or the inner metal ring 20. According to customer needs, step S400 can be further used to form an engraved surface on the surface of the outer metal ring 10 and / or the inner metal ring 20 to produce a product logo or anti-counterfeiting logo.

[0057] In one embodiment of the present invention, Fig. 9 As shown, after the step S400, the step S500 is further included: using a detergent to clean the telescopic lens bracket for the first time, and after the first cleaning, washing and baking at 150°C for about 20-30 minutes; using clean water to clean the telescopic lens bracket for the second time, and after the second cleaning, washing and baking at 150°C for about 20-30 minutes. In this embodiment, through the two-step cleaning and baking process of step S500, it can be effectively ensured that the manufactured telescopic lens bracket meets the dust-free standard and achieves high-standard delivery.

[0058] In one embodiment of the present invention, Figure 1 and 3 As shown, the silicone ring 30 includes an outer ring flat plate portion 31, an intermediate connecting portion 33 and an inner ring flat plate portion 32 which are integrally formed. The outer ring flat plate portion 31 and the inner ring flat plate portion 32 are respectively connected to the two ends of the intermediate connecting portion 33. The outer ring flat plate portion 31 is bonded to the surface of the outer ring metal ring 10, and the inner ring flat plate portion 32 is bonded to the surface of the inner ring metal ring 20. In this embodiment, the outer ring flat plate portion 31 and the inner ring flat plate portion 32 of the silicone ring 30 are mainly used to achieve bonding with the glue layer on the outer ring metal ring 10 and the inner ring metal ring 20, and the intermediate connecting portion 33 has a certain size and can achieve expansion and contraction. The silicone ring 30 structure formed in this way can ensure reliable and stable expansion and contraction on the basis of achieving stable connection between the outer ring metal ring 10 and the inner ring metal ring 20.

[0059] In one embodiment of the present invention, the cross section of the intermediate connecting portion 33 is U-shaped or Z-shaped. Figure 2 and 4 That is, at least the above two shapes of silicone ring 30 can be manufactured. It should be noted that the U-shaped or Z-shaped cross section of the middle connecting portion 33 is not completely U-shaped or Z-shaped, and its similarity to U-shaped or Z-shaped also belongs to the U-shaped or Z-shaped described in this embodiment.

[0060] In one embodiment of the present invention, see Figures 1 to 4, the outer ring flat plate portion 31 and the inner ring flat plate portion 32 are at the same height level or at different height levels. That is, in at least one embodiment, the outer ring metal ring 10 and the inner ring metal ring 20 of the manufactured telescopic lens bracket are at the same height level; in at least one embodiment, the outer ring metal ring 10 and the inner ring metal ring 20 of the manufactured telescopic lens bracket are at different height levels.

[0061] An embodiment of the present invention further provides a telescopic lens bracket, which is manufactured using the above-mentioned manufacturing method of the telescopic lens bracket.

[0062] In summary, the manufacturing method of the telescopic lens bracket according to the embodiment of the present invention has the following advantages:

[0063] 1. Used as a lens holder, it can improve the optical performance of the lens. The telescopic design allows the lens to be extended when in use, which can make greater use of the one-inch large-bottom sensor to obtain more light, and take brighter, clearer, and higher-quality photos in low-light, night scenes and other environments.

[0064] 2. The protective performance is reliable. The bracket made by the above method has good waterproof and dustproof capabilities, reaching the IP68 level. It can effectively protect the lens and internal components when encountering water splashes, dust, etc. in daily use, thereby extending the service life and usage scenarios of the mobile phone.

[0065] 3. It is extremely durable. After rigorous testing, it has a lifespan of 300,000 times of worry-free expansion and contraction, ensuring the long-term and stable use of the lens.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a telescopic lens bracket, characterized in that: The following steps are involved: S100: providing a first metal sheet and a second metal sheet, wherein the first metal sheet is provided with an inner hole, and the size of the second metal sheet is proportionally reduced relative to the size of the inner hole, placing the second metal sheet in the inner hole, spraying a first glue layer on a surface of the first metal sheet close to the inner circle of the inner hole, and spraying a second glue layer on a surface of the second metal sheet close to the outer circle; S200: placing the first metal sheet and the second metal sheet in an injection mold and injecting a silicone ring, wherein a surface of the silicone ring close to its outer ring is bonded to the first metal sheet through the first glue layer, and a surface of the silicone ring close to its inner ring is bonded to the second metal sheet through the second glue layer; S300: Punching and cutting the first metal sheet, the silicone ring and the second metal sheet that are bonded together to form a telescopic lens bracket including an outer metal ring, the silicone ring and an inner metal ring.

2. The method for manufacturing a telescopic lens bracket according to claim 1, characterized in that: In the step S100, a glue spraying jig is provided, the glue spraying jig comprises an upper mold and a lower mold, the lower mold is provided with a first positioning column and a second positioning column, and the upper mold is provided with a glue spraying hole; The first metal sheet is provided with a first positioning hole, the second metal sheet is provided with a second positioning hole, the first metal sheet and the second metal sheet are both placed on the lower mold, and the first positioning column is matched with the first positioning hole, and the second positioning column is matched with the second positioning hole; The upper mold is placed above the lower mold and covers the first metal sheet and the second metal sheet, and the glue spraying hole is directly opposite to the surface of the first metal sheet close to the inner circle of the inner hole and the surface of the second metal sheet close to the outer circle; The glue is sprayed onto the surfaces of the first metal sheet and the second metal sheet through the glue spraying holes by a glue dispensing machine, and the first glue layer and the second glue layer are formed respectively.

3. The method for manufacturing a telescopic lens bracket according to claim 2, characterized in that: The glue spraying jig also includes a material picking fork, which includes a handle and a plurality of support bars extending from one end of the handle and arranged at intervals. The lower mold is provided with a plurality of support ridges arranged at intervals. The first positioning column and the second positioning column are both provided on the support ridges. Each of the support bars is inserted into two adjacent support ridges respectively. After the handle is lifted upward, the first metal sheet and the second metal sheet can be taken out of the lower mold.

4. The method for manufacturing a telescopic lens bracket according to claim 1, characterized in that: In the step S200, after the silicone ring bonding the first metal sheet and the second metal sheet is injection molded, a bamboo stick wrapped with a dust-free cloth and dipped in alcohol is used to wipe the overflowed glue of the silicone ring back and forth.

5. The method for manufacturing a telescopic lens bracket according to claim 1, characterized in that: After step S300, the method further includes step S400: performing laser lithography on the surface of the telescopic lens bracket to form an engraved surface on the surface of the outer metal ring and / or the inner metal ring.

6. The method for manufacturing the telescopic lens bracket according to claim 5, characterized in that: After step S400, step S500 is also included: using a detergent to clean the telescopic lens bracket for the first time, and after the first cleaning, washing and baking at 150°C for about 20-30 minutes; using clean water to clean the telescopic lens bracket for the second time, and after the second cleaning, washing and baking at 150°C for about 20-30 minutes.

7. The method for manufacturing a telescopic lens bracket according to claim 1, characterized in that: The silicone ring includes an outer ring flat plate portion, an intermediate connecting portion and an inner ring flat plate portion which are integrally formed. The outer ring flat plate portion and the inner ring flat plate portion are respectively connected to the two ends of the intermediate connecting portion. The outer ring flat plate portion is bonded to the surface of the outer ring metal ring, and the inner ring flat plate portion is bonded to the surface of the inner ring metal ring.

8. The method for manufacturing the telescopic lens bracket according to claim 7, characterized in that: The cross section of the middle connecting portion is U-shaped or Z-shaped.

9. The method for manufacturing a telescopic lens bracket according to claim 7, characterized in that: The outer ring flat plate portion and the inner ring flat plate portion are at the same height level or at different height levels.

10. A telescopic lens bracket, characterized in that: The lens telescopic bracket is manufactured by the manufacturing method according to any one of claims 1 to 9.

Images