CN113500141A - High-light-transmission light and thin cover plate and production process thereof - Google Patents
High-light-transmission light and thin cover plate and production process thereof Download PDFInfo
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- CN113500141A CN113500141A CN202110809258.6A CN202110809258A CN113500141A CN 113500141 A CN113500141 A CN 113500141A CN 202110809258 A CN202110809258 A CN 202110809258A CN 113500141 A CN113500141 A CN 113500141A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
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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
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
The application relates to a high printing opacity frivolous apron and production technology thereof belongs to stereo set accessory production technical field, and it includes: plate body, setting are in the board upper portion and the setting of plate body top surface are in the board lower part of plate body bottom surface, plate body week side is provided with interior limit, interior limit is kept away from week side of plate body is provided with the outside, interior limit with handing-over department of outside is formed with the contained angle, the contained angle position is located the top on plate upper portion. In order to keep stereo set external structure's wholeness as far as possible, reduce external factor and cause the damage to stereo set inner structure, the application provides a high printing opacity frivolous apron and production technology, can produce the stereo set top cap of integration.
Description
Technical Field
The application relates to the technical field of sound equipment accessory production, in particular to a high-light-transmission light and thin cover plate and a production process thereof.
Background
The punching process is a metal processing method, which is based on the plastic deformation of metal, and applies pressure to the plate by using a die and a punching device to make the plate generate plastic deformation or separation, thereby obtaining a part with certain shape, size and performance.
The stamping process is generally characterized by comprising the following steps:
(1) the stamping is a processing method with high production efficiency and low material consumption. The stamping process is suitable for production of large-batch part products, is convenient for realizing mechanization and automation, has higher production efficiency, and simultaneously, the stamping production can not only strive to realize production with less waste materials and no waste materials, but also can fully utilize the leftover materials even if the leftover materials exist in certain conditions.
(2) The operation process is convenient, and the operator does not need higher level of skill.
(3) And the punched parts generally do not need to be machined, and have higher dimensional accuracy.
(4) And the stamping parts have better interchangeability. The stamping process has better stability, and the same batch of stamping parts can be mutually exchanged and used without influencing the assembly and the product performance.
(5) And because the stamping part is made of the plate material, the surface quality of the stamping part is better, and convenient conditions are provided for subsequent surface treatment procedures (such as electroplating and paint spraying).
(6) And parts with high strength, large rigidity and light weight can be obtained by stamping.
(7) And the stamping parts produced in batches by using the die are low in cost.
(8) And the parts with complex shapes which are difficult to process by other metal processing methods can be manufactured by stamping.
At present, to some audio equipment, its whole body also adopts stamping forming's technology to produce the lid and the casing of stereo set basically, however, because the audio equipment of old-fashioned, its lid and casing can be because need set up the button and offered the opening in production, but, offer the opening in order to set up the button, on the one hand not conform to present aesthetic, on the other hand, also because in humid weather, this kind of structure often can lead to the inside structure of stereo set to go wrong, thereby cause the stereo set to damage, and now a lot of stereo sets all possess certain light efficiency, the appearance of stereo set and the output of light efficiency are hardly taken into account to the stereo set shell of old-fashioned.
Disclosure of Invention
In order to keep stereo set external structure's wholeness as far as possible, reduce external factor and cause the damage to stereo set inner structure, the application provides a high printing opacity frivolous apron and production technology, can produce the stereo set top cap of an integration.
On the one hand, the application provides a high printing opacity frivolous apron adopts following technical scheme:
a high light transmission thin cover plate comprising: plate body, setting are in the board upper portion and the setting of plate body top surface are in the board lower part of plate body bottom surface, plate body week side is provided with interior limit, interior limit is kept away from week side of plate body is provided with the outside, interior limit with handing-over department of outside is formed with the contained angle, the contained angle position is located the top on plate upper portion.
Through adopting above-mentioned technical scheme, the plate body is including board upper portion and board lower part, through the outside and interior limit that set up, the structure of the formation in outside and interior limit makes the stereo set casing that closes with it can have better seal, simultaneously, this plate body is a whole board, and the stereo set lid consequently possesses has better wholeness, for the stereo set shell of old-fashioned, can effectively reduce the opening of this plate body, reduces external factors and causes the damage to the stereo set inner structure.
Preferably, the thickness of the plate body is 1.0mm-1.4mm, the height between the lower part of the plate and the top of the included angle is 5.1mm-5.2mm, and the height between the bottom of the outer edge and the top of the included angle is 4.3mm-4.5 mm.
Through adopting above-mentioned technical scheme, can reduce the weight of plate body on the one hand, on the other hand can control the height of contained angle for the stereo set shell that it formed can have better seal, thereby can reduce external factor and cause the damage to stereo set inner structure.
Preferably, the inner side is an arc-shaped side protruding towards the outer side of the plate body, and the outer side is an arc-shaped side protruding towards the outer side of the plate body.
Through adopting above-mentioned technical scheme, can improve the holistic structural stability of plate body on the one hand, on the other hand can be to improving the seal performance of the stereo set shell that forms thereafter to can reduce external factor and cause the damage to stereo set inner structure.
On the other hand, the application also provides a production process of the high-light-transmission light and thin cover plate, which adopts the following technical scheme:
a production process of a high-light-transmission light and thin cover plate comprises the following steps:
s1: cutting the plate material and blanking the plate material to form a plate body blank;
s2: punching the plate blank to form a plate blank;
s3: stretching and shaping the plate body initial blank by adopting one-step stamping, stamping an inner edge and an outer edge, and trimming to form a plate body die blank;
s4: and finally shaping the plate body mould blank by adopting continuous stamping to form the high-light-transmission light and thin cover plate.
Preferably, the S1 includes:
s1.1: selecting a steel plate with the thickness not more than 2.0mm, and cutting the steel plate into a circular plate with the diameter of 208mm-210mm by using plate shearing equipment;
s1.2: the manufacturing method comprises the following steps of blanking a circular plate to form a plate body blank by taking polyurethane silicone rubber as a male die of a punching machine and stainless steel as a female die of the punching machine, wherein the male die is a polyurethane silicone rubber circular cake with the periphery outwards protruding in an arc shape, the top surface of the male die is upwards protruding in an arc shape, the maximum diameter of the male die is 200.0mm, the bottom surface of the male die is downwards recessed in an arc shape, the maximum diameter of the female die is 210.0mm, and after abutting, the top surface of the male die is attached to the bottom surface of the female die.
Preferably, the S2 includes:
s2.1: punching a plate body blank, wherein six holes with the diameter of 1.0mm penetrate through the top surface of the plate body blank through punching operation, and connecting lines among the six holes are distributed on the plate body blank in an equilateral hexagon shape;
s2.2: the plate blank after punching is punched again, the periphery of the male die protrudes downwards, the periphery of the female die protrudes downwards, the lowest point of the protruding part of the periphery of the female die is not more than 2.0mm, and the plate blank forms a crease after punching to form a plate blank.
Preferably, the S3 includes:
s3.1: adjusting the relative position between an upper clamping plate provided with a female die and an upper die base for assembling the upper clamping plate, so that the vertical position of the female die is adjusted by 1.0mm downwards compared with the vertical position in S1.2, and punching the plate body blank, so that the plate body blank can be stretched and shaped, and the crease positions in S2.2 originally form an inner edge and an outer edge;
s3.2: and stamping the plate body initial blank on which the inner edge and the outer edge are preliminarily formed again, and trimming the edge of the outer edge to form a plate body die blank.
Preferably, the S4 includes:
s4.1: continuously stamping the plate body mold blank, wherein the bottommost part of the downward convex part of the periphery of the female die is an arc-shaped surface, so that the connecting part between the inner edge and the outer edge of the plate body mold blank is an arc-shaped surface;
s4.2: and (3) stamping the plate body die blank until the thickness is 1.0mm-1.4mm, and stopping stamping to form the high-light-transmission light and thin cover plate.
By adopting the technical scheme, the plate can be blanked through S1 to form a plate blank; punching the plate blank through S2 to form a plate blank; shaping and stretching the plate body primary blank through S3 to form a plate body die blank; the plate body die blank can be continuously punched until the plate body die blank is shaped through S4, and a complete high-light-transmission light-thin cover plate is formed.
Preferably, the step of S5 is further performed after the step of S4,
the S5: and carrying out CNC machining on the high-light-transmission light and thin cover plate.
Through adopting above-mentioned technical scheme, can maintain high printing opacity frivolous apron, improve the top cap product quality who produces.
Preferably, the step of S6 is further performed after the step of S5,
the S6 includes:
s6.1: sand blasting is carried out on the high-light-transmission light and thin cover plate, so that the top surface of the high-light-transmission light and thin cover plate is a frosted surface;
s6.2: carry out radium carving to the high printing opacity frivolous apron that has carried out the sandblast for the face local position of the high printing opacity frivolous apron is the smooth surface.
By adopting the technical scheme, the high-light-transmission light and thin cover plate can be subjected to sand blasting, so that the surface of the cover plate obtains certain cleanliness and different roughness, the mechanical property of the surface of the cover plate is improved, and the fatigue resistance and the structural stability of the cover plate are improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. blanking a plate to form a plate blank; punching a plate blank to form a plate blank; shaping and stretching the plate body blank to form a plate body mold blank; through the continuous punching press of plate body mould base until the design, can produce complete high printing opacity frivolous apron betterly.
2. Through the sand blasting and the arrangement that the inner edge and the outer edge are arc-shaped edges, the mechanical property of the cover plate can be improved, and the fatigue resistance and the structural stability of the cover plate are improved.
Drawings
Fig. 1 is a schematic structural diagram of a cover plate in a top view in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of the cover plate viewed from the bottom in the embodiment of the present application.
Fig. 3 is a schematic structural diagram of a mold for producing the cover plate in the embodiment of the present application.
Fig. 4 is a process flow diagram in an embodiment of the present application.
Description of reference numerals: 1. a plate body; 2. an upper plate portion; 3. a lower plate portion; 41. an inner side; 42. outside; 43. an included angle; 51. an upper die holder; 52. an upper splint; 53. a female die; 54. a lower die holder; 55. a lower splint; 56. and (4) a male die.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
On the one hand, this application embodiment discloses a high printing opacity frivolous apron.
Referring to fig. 1, a high light-transmitting light-thin cover plate includes a plate body 1, in this embodiment, the plate body 1 is a circular plate body 1, wherein the top surface of the plate body 1 is a plate upper portion 2, correspondingly, the bottom surface of the plate body 1 is a plate lower portion 3, and the overall thickness of the plate body 1 is 1.0mm-1.4mm, in this embodiment, the overall thickness of the plate body 1 is 1.2mm, and the plate body 1 that is sufficiently thin can make the plate body 1 have a better light-transmitting performance.
Referring to fig. 1 and 2, an inner edge 41 is provided on the periphery of the plate body 1, and an outer edge 42 is provided on the side of the inner edge 41 away from the plate body 1, wherein an included angle 43 is formed between the inner edge 41 and the outer edge 42, the included angle 43 is located above the upper portion 2 of the plate, and in this embodiment, the plate body 1, the inner edge 41 and the outer edge 42 are integrally formed after the circular plate is subjected to a punching operation, in this embodiment, the height of the lower portion 3 of the plate is 5.1mm to 5.2mm from the top of the included angle 43 to the plate body 1, the height of the bottom of the outer edge 42 is 4.3mm to 4.5mm from the top of the included angle 43 to the plate body, specifically, in this embodiment, the height of the lower portion 3 of the plate is 5.1mm from the top of the included angle 43, the height of the bottom of the outer edge 42 is 4.4mm from the top of the included angle 43, and the inner edge 41 is an arc-shaped edge protruding to the outside of the plate body 1, the outer edge 42 is an arc-shaped edge protruding towards the outside of the plate body 1.
On the other hand, the embodiment of the application also discloses a production process of the high-light-transmission light and thin cover plate.
Referring to fig. 4, a production process of a high-light-transmission light and thin cover plate includes:
s1: cutting the plate material and blanking the plate material to form a plate body blank;
specifically, in this embodiment, the S1 includes:
s1.1: selecting a steel plate with the thickness not greater than 2.0mm by a worker, wherein in the embodiment, the steel plate is a steel plate with the thickness of 1.8mm, the steel plate is cut into a strip-shaped plate body with a rectangular long strip shape, the length of the strip-shaped plate body is 880.0mm, the width of the strip-shaped plate body is 220.0mm, a circle is drawn on the strip-shaped plate body in a manner of drawing a circle by a marking pen, the size of the circle is 208mm-210mm, in the embodiment, the diameter of the circle is 209mm, and a circular plate with the diameter of 209mm is cut by a plate cutting device;
referring to fig. 3, S1.2: the die used by the punching machine comprises an upper die holder 51 and a lower die holder 54, wherein the top of the lower die holder 54 is provided with a lower clamping plate 55, the top of the lower clamping plate 55 is provided with a convex die 56, the convex die 56 adopts polyurethane silicone rubber as a die head, a buffer spring is arranged between the convex die 56 and the lower clamping plate 55, the bottom of the upper die holder 51 is provided with an upper clamping plate 52, the bottom of the upper clamping plate 52 is provided with a concave die 53, the concave die 53 adopts stainless steel as the die head, the buffer spring is also arranged between the concave die 53 and the upper clamping plate 52, wherein the convex die 56 is a polyurethane silicone rubber round cake with the outward arc-shaped convex periphery, the top surface of the convex die 56 is upwards arc-shaped convex, the maximum diameter of the convex die 56 is 200.0mm, the bottom surface of the convex die 56 is downwards arc-shaped concave, the maximum diameter of the concave die 53 is 210.0mm, the top surface of the convex die 56 is attached to the bottom surface of the concave die 53 after abutting, and then, a round plate with the diameter of 209mm is punched, forming a plate body blank.
Then, S2: punching the plate blank to form a plate blank;
specifically, the S2 includes:
s2.1: punching a plate body blank, wherein six holes with the diameter of 1.0mm penetrate through the top surface of the plate body blank through punching operation, and connecting lines among the six holes are distributed on the plate body blank in an equilateral hexagon shape;
s2.2: and (3) stamping the punched plate blank again, wherein the periphery of the male die 56 protrudes downwards, the periphery of the female die 53 protrudes downwards, the lowest point of the protruding part of the periphery of the female die 53 is not more than 2.0mm, the plate blank forms a crease after stamping, and meanwhile, the crease is positioned at the upper position of the integral plate structure to form a plate blank, wherein in the embodiment, the height between the lower part 3 of the plate blank and the top of the crease is 5.1mm, and the height between the bottommost part of the outer edge 42 of the crease and the top of the crease is 3.0 mm.
Then, S3: stretching and shaping the plate body initial blank by adopting one-step stamping, stamping an inner edge 41 and an outer edge 42, and trimming to form a plate body die blank;
specifically, the S3 includes:
s3.1: adjusting the relative position between the upper clamp plate 52 provided with the female die 53 and the upper die base 51 provided with the upper clamp plate 52, so that the vertical position of the female die 53 is adjusted by 1.0mm downwards compared with the vertical position in S1.2, punching the plate body blank, so that the plate body blank can be stretched and shaped, the inner edge 41 and the outer edge 42 are formed at the crease position in S2.2 originally, and the crease between the inner edge 41 and the outer edge 42 is changed into an included angle 43;
s3.2: the blank of the plate body on which the inner edge 41 and the outer edge 42 are preliminarily formed is punched again, and the edge of the outer edge 42 is trimmed to form a blank of the plate body, wherein in the embodiment, the height of the lower plate part 3 of the blank of the plate body from the top of the included angle 43 to the plate body 1 is 5.1mm, and the height of the bottom of the outer edge 42 from the top of the included angle 43 to the top of the included angle 43 is 3.6 mm.
S4: and finally shaping the plate body mould blank by adopting continuous stamping to form the high-light-transmission light and thin cover plate.
S4 includes:
s4.1: continuously stamping the plate body mold blank, wherein the bottommost part of the downward protruding part of the periphery of the female die 53 is an arc-shaped surface, so that the connecting part between the inner edge 41 and the outer edge 42 of the plate body 1 mold blank is an arc-shaped surface;
s4.2: and (3) stamping the plate body 1 blank to the thickness of 1.0-1.4 mm, wherein the specific thickness is 1.2mm, and then stopping stamping, wherein the height between the plate body 1 and the lower part 3 of the plate body blank at the top of an included angle 43 is 5.1mm, and the height between the bottom of the outer edge 42 and the top of the included angle 43 is 4.0mm, so that the high-light-transmission light and thin cover plate is formed.
Thereafter, S5 follows S4, specifically, S5 is: and carrying out CNC machining on the high-light-transmission light and thin cover plate.
Thereafter, S6 is performed after S5, and specifically, S6 includes:
s6.1: sand blasting is carried out on the high-light-transmission light and thin cover plate, so that the top surface of the high-light-transmission light and thin cover plate is a frosted surface;
s6.2: carry out radium carving to the high printing opacity frivolous apron that has carried out the sandblast for the local position of face of the high printing opacity frivolous apron is the smooth surface, specifically for seting up porose six hole positions and have the smooth surface that the diameter is 10mm, and mark has been beaten to this six position radium carving.
The above are all preferred embodiments of the present application, and the present embodiment is only explained for the present application, and the protection scope of the present application is not limited by this, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A high light transmission thin cover plate comprising:
a plate body (1), an upper plate part (2) arranged on the top surface of the plate body (1) and a lower plate part (3) arranged on the bottom surface of the plate body (1),
its characterized in that, plate body (1) week side is provided with interior limit (41), interior limit (41) are kept away from week side of plate body (1) is provided with outside (42), interior limit (41) with handing-over department of outside (42) is formed with contained angle (43), contained angle (43) position is located the top of board upper portion (2).
2. The cover plate of claim 1, wherein the cover plate is light-transmissive,
the thickness of the plate body (1) is 1.0mm-1.4mm, the distance between the lower part (3) of the plate and the top of the included angle (43) is 5.1mm-5.2mm, and the distance between the bottom of the outer edge (42) and the top of the included angle (43) is 4.3mm-4.5 mm.
3. The cover plate with high light transmittance and light weight according to claim 1, wherein the inner edge (41) is an arc-shaped edge protruding towards the outer side of the plate body (1), and the outer edge (42) is an arc-shaped edge protruding towards the outer side of the plate body (1).
4. A process for producing a high light transmission light thin cover plate according to any one of claims 1 to 3, comprising:
s1: cutting the plate material and blanking the plate material to form a plate body blank;
s2: punching the plate blank to form a plate blank;
s3: stretching and shaping the plate body initial blank by adopting one-time stamping, stamping an inner edge (41) and an outer edge (42), and trimming to form a plate body die blank;
s4: and finally shaping the plate body mould blank by adopting continuous stamping to form the high-light-transmission light and thin cover plate.
5. The manufacturing process of the light cover plate with high light transmittance according to claim 4,
the S1 includes:
s1.1: selecting a steel plate with the thickness not more than 2.0mm, and cutting the steel plate into a circular plate with the diameter of 208mm-210mm by using plate shearing equipment;
s1.2: regard polyurethane silicon rubber as terrace die (56) of punching machine, regard the die (53) of punching machine with stainless steel, blank the circular slab, form the plate body blank, wherein, terrace die (56) are the convex polyurethane silicon rubber cake of arc for the periphery outwards, the top surface of terrace die (56) is the convex setting of arc up, the maximum diameter of terrace die (56) is 200.0mm, the bottom surface of terrace die (56) is the concave setting of arc down, the maximum diameter of die (53) is 210.0mm, the looks butt back the top surface of terrace die (56) with the bottom surface of die (53) is laminated mutually.
6. The manufacturing process of the light cover plate with high light transmittance according to claim 5,
the S2 includes:
s2.1: punching a plate body blank, wherein six holes with the diameter of 1.0mm penetrate through the top surface of the plate body blank through punching operation, and connecting lines among the six holes are distributed on the plate body blank in an equilateral hexagon shape;
s2.2: and (2) punching the punched plate blank again, wherein the periphery of the male die (56) protrudes downwards, the periphery of the female die (53) protrudes downwards, the lowest point of the protruding part of the periphery of the female die (53) is not more than 2.0mm, and the plate blank forms a crease after punching to form a plate blank.
7. The manufacturing process of the light cover plate with high light transmittance according to claim 6,
the S3 includes:
s3.1: adjusting the relative position between an upper clamping plate (52) provided with a female die (53) and an upper die base (51) assembled with the upper clamping plate (52), so that the vertical position of the female die (53) is adjusted by 1.0mm downwards compared with the vertical position in S1.2, and punching the plate body blank, so that the plate body blank can be stretched and shaped, and the inner edge (41) and the outer edge (42) are formed at the crease line part in S2.2;
s3.2: and stamping the plate body initial blank which is preliminarily formed into the inner edge (41) and the outer edge (42) again, and trimming the edge of the outer edge (42) to form a plate body die blank.
8. The manufacturing process of the light cover plate according to claim 7,
the S4 includes:
s4.1: continuously stamping the plate body mold blank, wherein the bottommost part of the downward protruding part of the periphery of the female die (53) is an arc-shaped surface, so that the connecting part between the inner edge (41) and the outer edge (42) of the plate body (1) mold blank is an arc-shaped surface;
s4.2: and (3) stamping the die blank of the plate body (1) to the section with the thickness of 1.0-1.4 mm, and stopping stamping to form the high-light-transmission light and thin cover plate.
9. The manufacturing process of the light cover plate with high light transmittance according to claim 4,
said S4 is followed by S5, said S5: and carrying out CNC machining on the high-light-transmission light and thin cover plate.
10. The manufacturing process of the light cover plate according to claim 9,
s6 is also performed after S5,
the S6 includes:
s6.1: sand blasting is carried out on the high-light-transmission light and thin cover plate, so that the top surface of the high-light-transmission light and thin cover plate is a frosted surface;
s6.2: carry out radium carving to the high printing opacity frivolous apron that has carried out the sandblast for the face local position of the high printing opacity frivolous apron is the smooth surface.
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| CN202110809258.6A CN113500141B (en) | 2021-07-16 | 2021-07-16 | High-light-transmission light and thin cover plate and production process thereof |
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| CN202110809258.6A CN113500141B (en) | 2021-07-16 | 2021-07-16 | High-light-transmission light and thin cover plate and production process thereof |
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| CN113500141B CN113500141B (en) | 2023-06-23 |
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