A flexible circuit board manufacturing process

Abstract

The scheme belongs to the technical field of flexible circuit board production and discloses a flexible circuit board manufacturing process, which comprises the following steps: determining non-cutting parts of cutter rollers D1, D2, … and D n toward the flexible circuit board; pulling the flexible circuit board to advance at a speed v and pass through the cutter rollers D1, D2, … and D n , and simultaneously performing a circulation process until manufacturing is completed; the circulation process comprises: simultaneously rotating the cutter rollers D1, D2, … and D n at a linear speed v for one round to cut and form a unit on the flexible circuit board; and keeping the cutter rollers D1, D2, … and D n stationary until the flexible circuit board continues to advance a distance l-2πr. The scheme adopts two or more groups of cutter rollers to cut and manufacture a unit of the flexible circuit board, so that the manufacturing of the long-unit flexible circuit board is more easily realized, a cutter roller with a cross section circumference meeting the length requirement of the unit does not need to be designed, and a growing line meeting the operation requirement does not need to be redesigned due to the structural change of the cutter roller, so that the production cost is greatly saved, and the application is promoted and applied.

Description

Technical Field

[0001] This solution belongs to the field of flexible circuit board manufacturing technology, specifically involving a flexible circuit board manufacturing process. Background Technology

[0002] Flexible printed circuit boards (FPCs), also known as flexible circuit boards or simply "flexible boards," are printed circuit boards made with a flexible insulating substrate. They possess many advantages that rigid printed circuit boards lack. For example, they can be freely bent, coiled, and folded. Using flexible circuit boards can significantly reduce the size of electronic products, meeting the needs of electronic products moving towards higher density, miniaturization, and higher reliability. Therefore, flexible circuit boards are widely used in aerospace, military, mobile communications, laptops, computer peripherals, PDAs, digital cameras, and other fields and products.

[0003] LED tubes are a popular application area for flexible circuit boards. Using light-emitting diodes (LEDs) as the light source, they offer higher luminous efficiency, greater energy savings, longer lifespan, and are more environmentally friendly, making them the ideal replacement for fluorescent tubes at present. In LED tubes, LEDs are soldered onto the flexible circuit board using a special processing technique, similar to the application of flexible circuit boards in LED strips. Currently, flexible circuit boards used to manufacture LED tubes or LED strips generally include single-layer and double-layer boards. A single-layer board is a flexible circuit board with one metal layer, consisting of a first insulating layer, a metal layer, and a second insulating layer stacked sequentially. A double-layer board is a flexible circuit board with two metal layers, consisting of a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, and a third insulating layer stacked sequentially. Whether single-layer or double-layered, the metal layers must be cut into the designed circuit structure, which is typically designed as several loop units arranged along the length of the flexible circuit board. Unlike LED strips, the loop units in flexible circuit boards used for LED tubes are longer.

[0004] In existing technologies, to achieve continuous production of flexible circuit boards for LED strips, cylindrical die-cutting rollers are used for continuous die-cutting. The cross-sectional perimeter of these rollers is adapted to the length of the LED strip's cycle unit. However, the unit length of flexible circuit boards for LED tubes is longer than that of LED strips. If cylindrical die-cutting rollers are used for continuous die-cutting, the cross-section of the rollers needs to be designed to be larger, significantly increasing assembly difficulty and hindering cost savings. Therefore, there is a need to provide a manufacturing process for flexible circuit boards suitable for LED tubes. Summary of the Invention

[0005] This solution aims to overcome at least one defect (deficiency) in the existing technology and provide a flexible circuit board manufacturing process to solve the problem of mismatch between the perimeter of the cutter roller cross section and the length of the flexible circuit board unit.

[0006] To solve the above-mentioned technical problems, the following technical solution is adopted:

[0007] A flexible circuit board manufacturing process uses cutter rollers D1, D2, ..., D, each with a cross-sectional radius of r. n Cutting and fabricating flexible circuit boards with a unit length of l, using cutter rollers D1, D2, ... and D... n The roller surfaces all have cutting and non-cutting portions, with the cross-sectional arc lengths of the cutting portions being c1, c2, ... and c... n These are used to cut the first, second, ..., nth segments sequentially arranged in the unit of the flexible circuit board, respectively. The unit length l of the flexible circuit board satisfies: 2πr <l=c1+c2+…+c n n≥2 and n is a natural number;

[0008] The manufacturing process includes the following steps:

[0009] Determine the cutter rollers D1, D2, ... and D n The uncut portion faces the flexible circuit board;

[0010] The traction causes the flexible circuit board to move forward at a speed v and pass through cutter rollers D1, D2, ... and D. n The process continues in a loop until completion;

[0011] The cyclic process includes:

[0012] Make the cutter rollers D1, D2, ... and D n They rotate simultaneously at a linear velocity v for one revolution, cutting a unit on a flexible circuit board.

[0013] Make the cutter rollers D1, D2, ... and D n Remain stationary until the flexible circuit board continues to move forward a distance of l-2πr.

[0014] Furthermore, the adjacent arrangement of cutter rollers D i and D j These are the cutter rollers D1, D2, ... and D n Any two of them, the flexible circuit boards pass through the cutter roller D in sequence. i and D j ;

[0015] If i < j, then the cutter roller D i and D j The center distance between them is c i+1 +c i+2 +…+c j +rθ j -rθ i ;

[0016] If i > j, then the cutter roller D i and D jThe center distance between them is c1+c2+…+c j +c i+1 +c i+2 +…+c n +rθ j -rθ i ;

[0017] Where, θ i and θ j The cutter rollers D are respectively i and D j When at rest, the angle between the plane determined by its axis and its initial dividing line and the vertical plane, the initial dividing line being the dividing line between the starting end of the cut portion and the non-cut portion.

[0018] Preferably, the cutter rollers D1, D2, ... and D... n Any one of the cutter rollers D m The angle θ between the plane determined by its axis and its initial boundary line and the vertical plane when it remains stationary. m Satisfy: arccos((r-h) / r)<θ m <π, where h is the number of cutter rollers D1, D2, ... and D n The depth of the cutting edge of the cut portion.

[0019] More preferably, the cutter rollers D1, D2, ... and D n Any one of the cutter rollers D m The angle θ between the plane determined by its axis and its initial boundary line and the vertical plane when it remains stationary. m Satisfy: θ m =π - c m / 2r.

[0020] Preferably, the cutter rollers D1, D2, ... and D... n When at rest, the angles θ1, θ2, ..., θ1 between the plane determined by its axis and its initial boundary line and the vertical plane. n The following conditions must be met between them: θ1=θ2=…=θ n .

[0021] Furthermore, the cutter rollers D1, D2, ... and D n Any one of the cutter rollers D m The arc length of the cross-section of the cut portion satisfies: c m <2πr-2r·arccos((r-h) / r), where h is the number of cutter rollers D1, D2, … and D n The depth of the cutting edge of the cut portion.

[0022] Preferably, the cutter rollers D1, D2, ... and D... n The cross-sectional arc lengths c1, c2, ... and c of the cut portionn The following conditions must be met: c1 = c2 = ... = c n .

[0023] Furthermore, the cutter rollers D1, D2, ... and D n The conductive layer is fabricated by cutting a cutting roller D with a cross-sectional radius of r on the flexible circuit board. n+1 Through holes are cut on a flexible circuit board using a cutting roller D. n+1 The roller surface has both a cutting portion and a non-cutting portion, and the arc length of the cross-section of the cutting portion is c. n+1 ;

[0024] The manufacturing process includes the following steps:

[0025] Determine the cutter rollers D1, D2, ..., D n and D n+1 The uncut portion faces the flexible circuit board;

[0026] The traction causes the flexible circuit board to move forward at a speed v and pass through the cutter rollers D1, D2, ..., D n and D n+1 The process continues in a loop until completion;

[0027] The cyclic process includes:

[0028] Make the cutter rollers D1, D2, ..., D n and D n+1 They rotate simultaneously at a linear velocity v for one revolution, cutting a unit on a flexible circuit board.

[0029] Make the cutter rollers D1, D2, ..., D n and D n+1 Remain stationary until the flexible circuit board continues to move forward a distance of l-2πr.

[0030] Preferably, the cutter roller D n+1 There is a starting boundary line between the starting end of the cutting section and the non-cutting section, and the cutter roller D n+1 The angle θ between the plane determined by its axis and its initial boundary line and the vertical plane when it remains stationary. n+1 Satisfy: θ n+1 >arccos((r-h n-1 ) / r), where h n-1 For the cutter roller D n+1 The depth of the cutting edge of the cut portion.

[0031] Preferably, the cutter roller D n+1 The angle θ between the plane determined by its axis and its initial boundary line and the vertical plane when it remains stationary. n+1 Satisfy: θ n+1 =π - c n+1 / 2r.

[0032] Compared with existing technologies, this solution has the following advantages: This solution uses two or more sets of cutting rollers to cut and manufacture one unit of flexible circuit board, making it easier to manufacture flexible circuit boards with long units. It does not require designing cutting rollers with a cross-sectional perimeter that meets the unit length requirements, nor does it require redesigning growth lines that meet operational requirements due to changes in the structure of the cutting rollers. This greatly saves production costs and helps promote the application of flexible circuit boards with long units. Attached Figure Description

[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this solution. To better illustrate the solution, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0034] Figure 1 This is a process flow diagram of flexible circuit board manufacturing.

[0035] Figure 2 It is the cutter roller D m A structural diagram.

[0036] Figure 3 It is the cutter roller D m A schematic diagram of the cross-section.

[0037] Figure 4 This is a schematic diagram showing the manufacturing process of the cutter rollers arranged in sequence.

[0038] Figure 5 This is a schematic diagram of the manufacturing process where the cutter rollers are arranged in a random order.

[0039] Figure 6 This is another process flow diagram for the manufacturing process of flexible printed circuit boards.

[0040] Explanation of reference numerals in the attached diagram: Cutting portion 010, starting boundary line 011, ending boundary line 012, non-cutting portion 020. Detailed Implementation

[0041] To enable those skilled in the art to better understand this solution, the following detailed description is provided in conjunction with specific embodiments.

[0042] Please see Figure 1 The diagram illustrates a process flow chart of a first embodiment of a flexible circuit board fabrication process. This process, used for cutting and fabricating flexible circuit boards with a unit length of l, includes the following steps:

[0043] Step S110: Determine the cutter rollers D1, D2, ... and D n The uncut portion faces the flexible circuit board.

[0044] like Figures 2-3 As shown, the cutter rollers D1, D2, ... and D n All are cylindrical, with a cross-sectional radius of r, and their cross-sectional perimeter 2πr is smaller than the unit length l of the flexible circuit board. The cutter rollers D1, D2, ... and D... n The roller surfaces all have a cutting portion 010 and a non-cutting portion 020. The cutting portion 010 is designed with depths of h1, h2, ... and h20 respectively. n The cutting edges have cross-sectional arc lengths of c1, c2, ... and c, respectively. n These are used to cut the first, second, ..., and nth segments arranged sequentially in the flexible circuit board unit, respectively, as follows: Figure 4 As shown, the sum of their lengths is exactly the unit length l of the flexible circuit board, that is, the unit length l of the flexible circuit board satisfies: 2πr <l=c1+c2+…+c n The non-cutting portion 020 is smooth and oriented towards the flexible circuit board, preventing the flexible circuit board from being scratched by the cutter roller as it passes over the roller surface. This step establishes the initial state of each cutter roller. During subsequent cyclic execution of steps S121 to S122, each cutter roller will return to this initial state when it remains stationary, thus consistently preventing the flexible circuit board from being scratched by the cutter roller as it passes over the roller surface. Preferably, any cutter roller D... m The arc length of the cross-section of the cut portion 010 satisfies: c m <2πr-2r·arccos((r-h) m ) / r), where m is any natural number from 1 to n, h1=h2=…=h n =h.

[0045] Please see Figure 2The cutting portion 010 and the non-cutting portion 020 are connected end to end, with two dividing lines between them. These two dividing lines are parallel to each other and parallel to the axis of the cutter roller. As the cutter roller rotates, one of the dividing lines 011 between the cutting portion 010 and the non-cutting portion 020 first contacts the flexible circuit board that has passed. We define this dividing line as the starting dividing line 011. Subsequently, the cutting portion 010 continuously cuts the flexible circuit board that has passed as the cutter roller rotates, until the other dividing line 012 between the cutting portion 010 and the non-cutting portion 020 contacts the flexible circuit board that has passed. We define the dividing line that contacts the board later as the ending dividing line 012. Since the cutting part 010 cuts the flexible circuit board at different times as the cutting roller rotates, we call the end where the cutting part 010 first cuts the flexible circuit board the starting end, and the end where it cuts the flexible circuit board later the ending end. Therefore, the starting boundary line 011 is the boundary line between the starting end of the cutting part 010 and the non-cutting part 020, and the ending boundary line 012 is the boundary line between the ending end of the cutting part 010 and the non-cutting part 020.

[0046] In the initial state, the non-cutting portion 020 faces the flexible circuit board, and the starting boundary line 011 and the ending boundary line 012 are located on both sides of the vertical plane containing the axis of the cutter roller, respectively, by any cutter roller D. m The starting dividing line 011 and the cutter roller D m The plane defined by the axis has an angle θ with the vertical plane that is no greater than 180°. m Where m is any natural number from 1 to n. Compared to the non-cutting portion 020, the cutting edge of the cutting portion 010 is convex. To further reduce the possibility of the cutting edge scratching the flexible circuit board, the included angle θ is... m The preferred condition is: arccos((r-h) m ) / r)<θ m <π.

[0047] Besides the possibility of the blade edge near the starting boundary line 011 potentially scratching the flexible circuit board, the blade edge near the ending boundary line 012 may also scratch the flexible circuit board. To further reduce the possibility of the blade edge scratching the flexible circuit board, the included angle θ... m Ideally, the following condition should be further satisfied: θ m =π - c m / 2r ensures that the starting boundary line 011 and the ending boundary line 012 maintain a distance from the flexible circuit board that has passed through. At the same time, the cutting portion 010 of each cutter roller can be maximized, improving the utilization rate of the cutter roller and reducing the cost of production equipment.

[0048] Step S120: The flexible circuit board is pulled forward at a speed v and passes through the cutter rollers D1, D2, ... and D... nMeanwhile, steps S121 to S122 are executed repeatedly until the production is completed.

[0049] Step S121, make the cutter rollers D1, D2, ... and D n They rotate simultaneously at a linear velocity v for one revolution, cutting a unit on the flexible circuit board.

[0050] Step S122, make the cutter rollers D1, D2, ... and D n Remain stationary until the flexible circuit board continues to move forward a distance of l-2πr.

[0051] Cutter rollers D1, D2, ... and D n They can be arranged in order from 1 to n (e.g.) Figure 4 ), or the order can be shuffled (e.g. Figure 5 Accordingly, the flexible circuit board passes through cutter rollers D1, D2, ... and D... n The order will be according to the cutter rollers D1, D2, ... and D n The arrangement order is as follows. Assume adjacent cutter rollers D... i and D j These are the cutter rollers D1, D2, ... and D n If any two of them are selected, the flexible circuit board will pass through the cutter roller D in sequence. i and D j ;

[0052] If i < j, then the cutter roller D i and D j The center distance between them is c i+1 +c i+2 +…+c j +rθ j -rθ i ;

[0053] If i > j, then the cutter roller D i and D j The center distance between them is c1+c2+…+c j +c i+1 +c i+2 +…+c n +rθ j -rθ i ;

[0054] Where, θ i and θ j The cutter rollers D are respectively i and D j The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary.

[0055] When θ i =θ j When i < j, then the cutter roller Di and D j The center distance between them is c i+1 +c i+2 +…+c j If i > j, then the cutter roller D i and D j The center distance between them is c1+c2+…+c j +c i+1 +c i+2 +…+c n At this point, the center distance between two adjacent cutter rollers is easier to determine; therefore, cutter rollers D1, D2, ... and D... n When at rest, the angles θ1, θ2, ..., θ1 between the plane determined by its axis and its initial boundary line and the vertical plane. n The optimal values ​​among them should satisfy: θ1=θ2=…=θ n .

[0056] Cutter rollers D1, D2, ... and D n The cross-sectional arc lengths c1, c2, ... and c of the cut portion n The following conditions must be met: c1 = c2 = ... = c n When =c, the difficulty in determining the center distance between two adjacent cutter rollers is further reduced, that is:

[0057] If i < j, then the cutter roller D i and D j The center distance between them is (j-i)·c+rθ j -rθ i ;

[0058] If i > j, then the cutter roller D i and D j The center distance between them is (n+j-i)·c+rθ j -rθ i .

[0059] Cutter rollers D1, D2, ... and D n After rotating simultaneously at a linear velocity v for one revolution, the cells cut and formed on the flexible circuit board may happen to form the same unit, for example... Figure 4 They may belong to different units, but their sum is exactly one unit, for example... Figure 5 .

[0060] This embodiment uses two or more sets of cutting rollers to cut and manufacture one unit of the flexible circuit board, making it easier to manufacture long unit flexible circuit boards. It does not require designing cutting rollers with a cross-sectional perimeter that meets the unit length requirements, nor does it require redesigning the growth line to meet the operating requirements due to changes in the structure of the cutting rollers, which greatly saves production costs and helps to promote the application of long unit flexible circuit boards.

[0061] Please see Figure 6 This illustrates a process flow diagram of another embodiment of the flexible circuit board manufacturing process. (And...) Figure 1 Compared to the flexible circuit board manufacturing process shown, this manufacturing process, in addition to using cutter rollers D1, D2, ... and D... n Metal layers are fabricated by cutting on flexible circuit boards, and a cutting roller D with a cross-sectional radius of r is also used. n+1 The process of cutting through holes on a flexible circuit board includes the following steps:

[0062] Step S210: Determine the cutter rollers D1, D2, ..., D n and D n+1 The uncut portion faces the flexible circuit board.

[0063] like Figure 2 As shown, the cutter rollers D1, D2, ..., D n and D n+1 All are cylindrical, with a cross-sectional radius of r, and a cross-sectional perimeter of 2πr that is smaller than the unit length l of the flexible circuit board.

[0064] Cutter rollers D1, D2, ..., D n and D n+1 The roller surfaces all have a cutting section 010 and a non-cutting section 020. The cutting section 010 is designed with a blade edge, and the blade rollers are D1, D2, ..., D2. n and D n+1 The cutting depths are h1, h2, ..., h n and h n+1 Where h1 = h2 = ... = h n =h. Cutter rollers D1, D2, ... and D n The cross-sectional arc lengths of the cut portion 010 are c1, c2, ... and c. n These segments are used to cut the first, second, ..., and nth segments sequentially arranged in the unit of the flexible circuit board. The sum of their lengths is exactly the unit length l of the flexible circuit board, that is, the unit length l of the flexible circuit board satisfies: 2πr <l=c1+c2+…+c n n≥2 and n is a natural number. Cutter roller D n+1 The cross-sectional arc length of the cut portion 010 is c. n+1 It is used to cut and form through holes, including component holes and connecting holes.

[0065] The non-cutting portion 020 is smooth and oriented towards the flexible circuit board, preventing the flexible circuit board from being scratched by the cutter rollers as they pass over the roller surface. This step establishes the initial state of each cutter roller. During subsequent cyclic execution of steps S121 to S122, each cutter roller will return to this initial state when it remains stationary, thus ensuring that the flexible circuit board is always prevented from being scratched by the cutter rollers as it passes over the roller surface.

[0066] Preferably, the cutter rollers D1, D2, ..., D n and D n+1 arbitrary cutter roller D m The arc length of the cross-section of the cut portion 010 satisfies: c m <2πr-2r·arccos((r-h) m ) / r), where m is any natural number from 1 to n+1.

[0067] The cutting section 010 and the non-cutting section 020 are connected end to end, with two dividing lines between them. These two dividing lines are parallel to each other and parallel to the axis of the cutter roller. As the cutter roller rotates, one of the dividing lines 011 between the cutting section 010 and the non-cutting section 020 first contacts the flexible circuit board that has passed. We define this dividing line as the starting dividing line 011. Subsequently, the cutting section 010 continuously cuts the flexible circuit board that has passed as the cutter roller rotates, until the other dividing line 012 between the cutting section 010 and the non-cutting section 020 contacts the flexible circuit board that has passed. We define the dividing line that contacts the board later as the ending dividing line 012. Since the cutting part 010 cuts the flexible circuit board at different times as the cutting roller rotates, we call the end where the cutting part 010 first cuts the flexible circuit board the starting end, and the end where it cuts the flexible circuit board later the ending end. Therefore, the starting boundary line 011 is the boundary line between the starting end of the cutting part 010 and the non-cutting part 020, and the ending boundary line 012 is the boundary line between the ending end of the cutting part 010 and the non-cutting part 020.

[0068] In the initial state, the non-cutting portion 020 faces the flexible circuit board, and the starting boundary line 011 and the ending boundary line 012 are located on both sides of the vertical plane containing the axis of the cutter roller, respectively, by any cutter roller D. m The starting dividing line 011 and the cutter roller D m The plane defined by the axis has an angle θ with the vertical plane that is no greater than 180°. m Where m is any natural number from 1 to n+1. Compared to the non-cutting portion 020, the cutting edge of the cutting portion 010 is convex. To further reduce the possibility of the cutting edge scratching the flexible circuit board, the included angle θ... m The preferred condition is: arccos((r-h) m ) / r)<θ m <π.

[0069] Besides the possibility of the blade edge near the starting boundary line 011 potentially scratching the flexible circuit board, the blade edge near the ending boundary line 012 may also scratch the flexible circuit board. To further reduce the possibility of the blade edge scratching the flexible circuit board, the included angle θ... m Ideally, the following condition should be further satisfied: θm =π - c m / 2r ensures that the starting boundary line 011 and the ending boundary line 012 maintain a distance from the flexible circuit board that has passed through. At the same time, the cutting portion 010 of each cutter roller can be maximized, improving the utilization rate of the cutter roller and reducing the cost of production equipment.

[0070] Step S220: The flexible circuit board is pulled forward at a speed v and passes through the cutter rollers D1, D2, ..., D n and D n+1 Meanwhile, steps S221 to S222 are executed repeatedly until the production is completed.

[0071] Step S221, make the cutter rollers D1, D2, ..., D n and D n+1 They rotate simultaneously at a linear velocity v for one revolution, cutting a unit on the flexible circuit board.

[0072] Step S222, make the cutter rollers D1, D2, ..., D n and D n+1 Remain stationary until the flexible circuit board continues to move forward a distance of l-2πr.

[0073] Cutter rollers D1, D2, ... and D n They can be arranged in order from 1 to n (e.g.) Figure 4 ), or the order can be shuffled (e.g. Figure 5 Accordingly, the flexible circuit board passes through cutter rollers D1, D2, ... and D... n The order will be according to the cutter rollers D1, D2, ... and D n The arrangement order is as follows. Assume adjacent cutter rollers D... i and D j These are the cutter rollers D1, D2, ... and D n If any two of them are selected, the flexible circuit board will pass through the cutter roller D in sequence. i and D j ;

[0074] If i < j, then the cutter roller D i and D j The center distance between them is c i+1 +c i+2 +…+c j +rθ j -rθ i ;

[0075] If i > j, then the cutter roller D i and D j The center distance between them is c1+c2+…+c j +c i+1 +c i+2 +…+c n +rθj -rθ i ;

[0076] Where, θ i and θ j The cutter rollers D are respectively i and D j The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary.

[0077] When θ i =θ j When i < j, then the cutter roller D i and D j The center distance between them is c i+1 +c i+2 +…+c j If i > j, then the cutter roller D i and D j The center distance between them is c1+c2+…+c j +c i+1 +c i+2 +…+c n At this point, the center distance between two adjacent cutter rollers is easier to determine; therefore, cutter rollers D1, D2, ... and D... n When at rest, the angles θ1, θ2, ..., θ1 between the plane determined by its axis and its initial boundary line and the vertical plane. n The optimal values ​​among them should satisfy: θ1=θ2=…=θ n .

[0078] Cutter rollers D1, D2, ... and D n The cross-sectional arc lengths c1, c2, ... and c of the cut portion n The following conditions must be met: c1 = c2 = ... = c n When =c, the difficulty in determining the center distance between two adjacent cutter rollers is further reduced, that is:

[0079] If i < j, then the cutter roller D i and D j The center distance between them is (j-i)·c+rθ j -rθ i ;

[0080] If i > j, then the cutter roller D i and D j The center distance between them is (n+j-i)·c+rθ j -rθ i .

[0081] Cutter rollers D1, D2, ... and D n After rotating simultaneously at a linear velocity v for one revolution, the cells cut and formed on the flexible circuit board may happen to form the same unit, for example... Figure 4 They may belong to different units, but their sum is exactly one unit, for example... Figure 5 .

[0082] Cutter Roller D n+1 Arranged on cutter rollers D1, D2, ... and D n Then, it connects with the previous cutter roller (cutter rollers D1, D2, ... and D...). n The center distance of one of them depends on the location of the through hole design.

[0083] For a single-layer board, it includes a first insulating layer, a metal layer, and a second insulating layer stacked sequentially. Besides the metal layer being cut to the designed circuit structure, the first insulating layer needs to have component holes for electrical connection between the components and the metal layer to connect LEDs, resistors, and other components. For an upper-layer board, it includes a first insulating layer, a first metal layer, a second insulating layer, a second metal layer, and a third insulating layer stacked sequentially. Besides the metal layer being cut to the designed circuit structure, the first insulating layer needs to have component holes for electrical connection between the components and the metal layer to connect LEDs, resistors, and other components. To connect the first metal layer and the second metal layer, connecting holes need to be formed on both the first metal layer and the second insulating layer for electrical connection between the two metal layers.

[0084] This embodiment uses n+1 sets of cutting rollers to cut and manufacture one unit of a flexible circuit board, where n sets are used to manufacture the metal layer and 1 set is used to manufacture through holes. This makes it easier to manufacture flexible circuit boards with long units. It eliminates the need to design cutting rollers with a cross-sectional perimeter that meets the unit length requirements, and it also eliminates the need to redesign the growth line to meet the operating requirements due to changes in the structure of the cutting rollers. This greatly saves production costs and helps to promote the application of flexible circuit boards with long units.

[0085] Obviously, the above embodiments of this solution are merely examples for clearly illustrating this solution, and are not intended to limit the implementation of this solution. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this solution should be included within the scope of protection of the claims of this solution.

Claims

1. A flexible circuit board manufacturing process, characterized in that, Using cross-sectional radii of all r cutter roller D 1. D 2. ... and D n The length of the cutting and manufacturing unit is l Flexible circuit boards, cutter rollers D 1. D 2. ... and D n The roller surfaces all have cutting and non-cutting portions, and the arc lengths of the cross-sections of the cutting portions are respectively... c 1. c 2. ... and c n These are used to cut the first, second, ..., and nth segments arranged sequentially in the unit of the flexible circuit board, respectively. The unit length of the flexible circuit board... l satisfy: 2πr<l=c 1 +c 2 +…+c n , n≥2 and n It is a natural number; The manufacturing process includes the following steps: Determine the cutter roller D 1. D 2. ... and D n The uncut portion faces the flexible circuit board; Traction causes the flexible circuit board to move at a speed v Advance and pass through the cutter roller D 1. D 2. ... and D n The process continues in a loop until completion; The cyclic process include: Cutter roller D 1. D 2. ... and D n With linear velocity v Simultaneously rotating once, it cuts a unit on the flexible circuit board; Cutter roller D 1. D 2. ... and D n Remain stationary until the flexible circuit board continues to move forward a certain distance. l-2πr ; Adjacent arrangement of cutter rollers D i and D j It is a cutter roller D 1. D 2. ... and D n Any two of them, the flexible circuit boards pass through the cutter rollers in sequence. D i and D j ; like i < j Then the cutter roller D i and D j The center distance between them is c i+1 +c i+2 +…+c j +rθ j -rθ i ; like i>j Then the cutter roller D i and D j The center distance between them is c 1 +c 2 +…+c j +c i+1 +c i+2 +…+c n +rθ j -rθ i ; in, θ i and θ j They are respectively knife rollers D i and D j When at rest, the angle between the plane determined by its axis and its initial dividing line and the vertical plane, the initial dividing line being the dividing line between the starting end of the cut portion and the non-cut portion; Cutter roller D 1. D 2. ... and D n Any one of the cutter rollers D m The arc length of the cross-section of the cut portion satisfies: c m ＜2πr－2r· arccos((r-h) / r) ,in, h For the cutter roller D 1. D 2. ... and D n The depth of the cutting edge of the cut portion.

2. The flexible circuit board manufacturing process according to claim 1, characterized in that, Cutter roller D 1. D 2. ... and D n Any one of the cutter rollers D m The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary. θ m satisfy: arccos((r-h) / r)<θ m ＜π ,in, h For the cutter roller D 1. D 2. ... and D n The depth of the cutting edge of the cut portion.

3. The flexible circuit board manufacturing process according to claim 2, characterized in that, Cutter roller D 1. D 2. ... and D n Any one of the cutter rollers D m The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary. θ m satisfy: θ m =π－c m / 2r .

4. The flexible circuit board manufacturing process according to claim 1, characterized in that, Cutter roller D 1. D 2. ... and D n The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary. θ 1. θ 2. ... and θ n The following conditions must be met: θ 1= θ 2=…= θ n .

5. The flexible circuit board manufacturing process according to claim 1, characterized in that, Cutter roller D 1. D 2. ... and D n The cross-sectional arc length of the cut portion c 1. c 2. ... and c n The following conditions must be met: c 1= c 2=…= c n .

6. The flexible circuit board manufacturing process according to claim 1, characterized in that, Cutter roller D 1. D 2. ... and D n Metal layers are cut and fabricated on flexible circuit boards, using a cutting roller with a cross-sectional radius of r. D n+1 Cutting through holes on a flexible circuit board using a cutting roller. D n+1 The roller surface has both a cutting section and a non-cutting section, and the arc length of the cross-section of the cutting section is... c n+1 ; The manufacturing process includes the following steps: Determine the cutter roller D 1. D 2、…、 D n and D n+1 The uncut portion faces the flexible circuit board; Traction causes the flexible circuit board to move at a speed v Advance and pass through the cutter roller D 1. D 2、…、 D n and D n+1 The process continues in a loop until completion; The cyclic process include: Cutter roller D 1. D 2、…、 D n and D n+1 With linear velocity v Simultaneously rotating once, it cuts a unit on the flexible circuit board; Cutter roller D 1. D 2、…、 D n and D n+1 Remain stationary until the flexible circuit board continues to move forward a certain distance. l-2πr .

7. The flexible circuit board manufacturing process according to claim 6, characterized in that, Cutter roller D n+1 There is a starting boundary line between the starting end of the cutting section and the non-cutting section, and the cutter roller... D n+1 The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary. θ n+1 satisfy: arccos((r-h n+1 ) / r)<θ n+1 ＜π ,in, h n+1 For the cutter roller D n+1 The depth of the cutting edge of the cut portion.

8. The flexible circuit board manufacturing process according to claim 7, characterized in that, Cutter roller D n+1 The angle between the plane defined by its axis and its initial boundary line and the vertical plane when it remains stationary. θ n+1 satisfy: θ n+1 =π－c n+1 / 2r .

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