TWI789068B - Calculation method of expansion and contraction value of circuit board and hole forming method of multilayer circuit board - Google Patents

Abstract

The invention discloses a method for calculating the expansion and contraction value of a circuit board and a hole forming method for a multilayer circuit board. The calculation method of the expansion and contraction value of the circuit board includes: scanning step, corner coordinate calculation step, center of gravity coordinate calculation step, average center of gravity coordinate calculation step, reference corner coordinate calculation step, allowable range definition step and adjustment step. The method for calculating the expansion and contraction value of the circuit board and the hole forming method of the multilayer circuit board of the present invention can greatly reduce the probability of the problem that the through hole exceeds the original preset position of the core board, and can effectively improve the manufacturing of the multilayer circuit board yield.

Description

Calculation method of expansion and contraction value of circuit board and hole forming method of multilayer circuit board

The invention relates to a method for calculating the expansion and contraction value of a circuit board and a method for forming holes in the circuit board, in particular to a method for calculating the expansion and contraction value of a multilayer circuit board and a method for forming holes in the multilayer circuit board.

Existing common multilayer circuit boards are formed by pressing multiple core boards together. There are related circuits electrically connected to each other between each core board, and multilayer circuit boards usually have at least one plated through hole (Plated Through Hole). , PTH) or commonly known as the conduction hole (via). The forming method of the plated through hole or commonly known as the via hole is: first forming the through hole in the multi-layer circuit board, and then electroplating the conductive layer in the through hole.

As shown in Figure 1, as the wire diameter of the circuit on each core board becomes smaller, the aperture diameter of the through hole is also reduced accordingly. The core board is predetermined to be provided with the problem of the allowable error range R of the through hole (commonly known as partial break in the industry). This problem may lead to damage to the circuit in the core board, which will lead to the problem of a decline in the manufacturing yield of the multilayer circuit board.

The invention discloses a method for calculating the expansion and shrinkage value of a circuit board and a hole forming method for a multilayer circuit board, which are mainly used to improve the existing calculation method for the expansion and contraction value and the hole forming method for a multilayer circuit board, and it is easy for through holes to exceed the original core board. The problem of the preset position leads to the problem of a decrease in the manufacturing yield of the multilayer circuit board.

One embodiment of the present invention discloses a method for calculating the expansion and contraction value of a circuit board, which is used for execution by a processor of a circuit board forming equipment, so that the circuit board forming equipment is drilling a multi-layer core board group Before the hole, calculate the expansion and contraction value of the multi-layer core board group. The multi-layer core board group is composed of multiple core boards stacked on each other. After the multi-layer core board group is drilled by the circuit board forming equipment, it will become a multi-layer circuit. Each core board has four marking units, and any marking unit of the multilayer core board group does not completely overlap any marking unit in a longitudinal direction, and the longitudinal direction is parallel to the normal direction of each core board; the expansion and contraction of the circuit board The calculation method of the value includes: a scanning step: controlling a scanning device to scan the multi-layer core board group to obtain a marking coordinate of each marking unit of each core board; a corner coordinate calculation step: using four corresponding to each core board A mark coordinate and a core board information corresponding to each core board, calculate the four corner coordinates of each core board; the core board information includes at least one core board size; a center of gravity coordinate calculation step: use the four Corner coordinates, calculate a center of gravity coordinates of each core board; an average center of gravity coordinates calculation step: use a plurality of center of gravity coordinates to calculate an average center of gravity coordinates; a reference corner coordinates calculation step: use the average center of gravity coordinates and a circuit board standard Size information, calculate four reference corner coordinates; Among them, the four reference corner coordinates can form a reference rectangle after being connected by four virtual line segments; A preset allowable value defines four initial allowable ranges for the radius; an adjustment step: adjust the average center of gravity coordinates and four reference corner coordinates to obtain an optimized center of gravity coordinates and four optimized corner coordinates; wherein, the four optimized After the corner coordinates are connected by four virtual line segments, an optimized quadrilateral can be formed; the deformation amount of the optimized quadrilateral and the reference rectangle in the X-axis direction and the deformation amount of the optimized quadrilateral and the reference rectangle in the Y-axis direction are not greater than an allowable deformation amount ; Among them, taking each optimized corner coordinate as the center and taking the preset allowable value as the radius to define four optimized allowable ranges, and the total number of initial corner coordinates falling within each optimized allowable range is not less than The total number of initial corner coordinates within each initial allowable range; a calculation step: calculate a deformation amount of the multi-layer core board group by using the reference rectangle and the optimized quadrilateral.

One embodiment of the present invention discloses a method for forming a hole in a multilayer circuit board, which includes: a preparation step: preparing a multilayer core board group, the multilayer core board group is composed of a plurality of core boards stacked on each other, any one The marking unit does not completely overlap with any marking unit in a longitudinal direction, and the longitudinal direction is parallel to a normal line of a surface of the first core board; a scanning step: controlling a scanning device to scan the multi-layer core board group to obtain A mark coordinate of each mark unit of each core board; a corner coordinate calculation step: use four mark coordinates corresponding to each core board and a core board information corresponding to each core board to calculate the four sides of each core board Angle coordinates; core board information includes at least one core board size; a center of gravity coordinate calculation step: use the four corner coordinates of each core board to calculate a center of gravity coordinate of each core board; an average center of gravity coordinate calculation step: use multiple The center of gravity coordinates calculate an average center of gravity coordinate; a reference corner coordinate calculation step: use the average center of gravity coordinates and a circuit board standard size information to calculate four reference corner coordinates; wherein, the four reference corner coordinates pass through four virtual line segments After being connected, a standard rectangle can be formed; one allowable range definition: take the coordinates of each reference corner as the center, and define four initial allowable ranges with a preset allowable value as the radius; one adjustment step: adjust the average center of gravity coordinates and Four reference corner coordinates, to obtain an optimized center of gravity coordinates and four optimized corner coordinates; wherein, after the four optimized corner coordinates are connected by four virtual line segments, an optimized quadrilateral can be formed; the optimized quadrilateral and the reference rectangle are at X The amount of deformation in the axial direction and the amount of deformation of the optimized quadrilateral and the reference rectangle in the Y-axis direction are not greater than an allowable amount of deformation; where the coordinates of each optimized corner are the center, and the radius can be defined by the preset allowable value Four optimization allowable ranges, and the total number of initial corner coordinates falling within each optimized allowable range is not less than the total number of initial corner coordinates falling within each initial allowable range; a calculation step: using the reference rectangle and optimized quadrilateral calculation A deformation amount of the multi-layer core board group.

To sum up, the method for calculating the expansion and contraction value of the circuit board and the hole forming method for the multi-layer circuit board of the present invention can greatly reduce the occurrence probability of the problem that the through hole exceeds the original preset position of the core board, and can effectively improve the multi-layer circuit board. board manufacturing yield.

In order to further understand the characteristics and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention, but these descriptions and drawings are only used to illustrate the present invention, rather than to make any statement on the scope of protection of the present invention. limit.

Known:

P: multilayer circuit board

H: through hole

R: allowable error range

this invention:

S11~S18: Process steps

SX1~SX10: process steps

100: multi-layer core board group

111, 112, 113, 114: marking unit

121, 122, 123, 124: marking unit

131, 132, 133, 134: marking unit

141, 142, 143, 144: marking unit

A1: Line area

A2: Non-line area

11, 12, 13, 14: core board

11A, 12A, 13A, 14A: wide side

B1, B2, B3, B4: virtual rectangles

C1: virtual axis

C2: virtual axis

Z: border

C11, C12, C13, C14: corner coordinates

C21, C22, C23, C24: corner coordinates

C31, C32, C33, C34: corner coordinates

C41, C42, C43, C44: corner coordinates

G1, G2, G3, G4: Coordinates of center of gravity

AVG: average center of gravity coordinates

FVG: Optimize the center of gravity coordinates

SG1, SG2, SG3, SG4: base corner coordinates

TR1, TR2, TR3, TR4: initial tolerance range

FG1, FG2, FG3, FG4: Optimize corner coordinates

FR1, FR2, FR3, FR4: Optimized tolerance range

FIG. 1 is a partial schematic diagram of a conventional multilayer circuit board.

Fig. 2 is a schematic flowchart of the calculation method of the expansion and contraction value of the circuit board of the present invention.

Fig. 3 is a schematic diagram of a multi-layer core board group in the method for calculating the expansion and contraction value of a circuit board according to the present invention.

Fig. 4 is an exploded schematic view of the multi-layer core board group in the method for calculating the expansion and contraction value of the circuit board according to the present invention.

FIG. 5 is an image obtained by a scanning device after scanning the multi-layer core board assembly of the present invention.

6 is a schematic diagram of a processor executing the scanning step and the corner coordinate calculation step of the method for calculating the expansion and contraction value of the circuit board of the present invention.

7 is a schematic diagram of a processor executing the steps of calculating the center of gravity coordinates, calculating the average center of gravity coordinates, calculating the reference corner coordinates and defining the allowable range of the calculation method for the expansion and contraction value of the circuit board of the present invention.

FIG. 8 is a schematic diagram of the adjustment steps of the expansion and contraction value of the circuit board performed by the processor according to the present invention.

FIG. 9 is a method for forming a hole in a multilayer circuit board of the present invention.

In the following description, if it is pointed out that please refer to the specific drawing or as shown in the specific drawing, it is only used to emphasize in the subsequent description, most of the relevant content mentioned appears in the specific drawing, It is not intended, however, to limit the ensuing description to only those particular drawings referred to.

Please refer to Fig. 2 to Fig. 5 together, the calculation method of the expansion and contraction value of the circuit board of the present invention is used for a processor of a circuit board molding equipment to execute, so that the circuit board molding equipment is Before the multi-layer core board group is drilled, calculate the expansion and shrinkage value of the multi-layer core board group. The multi-layer core board group is composed of multiple core boards stacked on each other. Any marking unit in a longitudinal direction (such as the Z-axis direction in FIG. 3 ) does not completely overlap with any marking unit, and the longitudinal direction is parallel to a normal line of a surface of the multilayer core board assembly.

The calculation method of the expansion and contraction value of the circuit board includes: a scanning step S11: controlling a scanning device (such as X-ray scanning equipment) to scan the multi-layer core board group to obtain a marking coordinate of each marking unit of each core board; Calculation step S12 of corner coordinates: use the four marked coordinates corresponding to each core board and a core board information corresponding to each core board to calculate the four corner coordinates of each core board; the core board information includes at least one core board Size; a center of gravity coordinate calculation step S13: use the four corner coordinates of each core plate to calculate a center of gravity coordinate of each core plate; an average center of gravity coordinate calculation step S14: use multiple center of gravity coordinates to calculate an average center of gravity coordinate; Calculation step S15 of a reference corner coordinate: using the average center of gravity coordinates and a standard size information of a circuit board to calculate four reference corner coordinates; where the four reference corner coordinates are connected by four virtual line segments to form a reference Rectangle; an allowable range defining step S16: taking the coordinates of each reference corner as the center, and defining four initial allowable ranges with a preset allowable value as a radius; an adjustment step S17: adjusting the average center of gravity coordinates and the four reference corners Coordinates, to obtain an optimized center of gravity coordinates FVG and four optimized corner coordinates; wherein, after the four optimized corner coordinates are connected by four virtual line segments, an optimized quadrilateral can be formed; the deformation of the optimized quadrilateral and the reference rectangle in the X-axis direction The amount of deformation and the deformation of the optimized quadrilateral and the reference rectangle in the Y-axis direction are not greater than a permissible deformation; among them, each optimized corner coordinate FVG is the center, and the preset allowable value is Radius can define four optimized allowable ranges, and the total number of initial corner coordinates falling within each optimized allowable range is not less than the total number of initial corner coordinates falling within each initial allowable range; a calculation step S18: using A deformation amount (namely expansion and contraction value) of the multi-layer core board group is calculated from the reference rectangle and the optimized quadrilateral.

As shown in FIG. 3 to FIG. 5 , the multi-layer core board group 100 may include, for example, four core boards, and the dimensions of each core board are substantially the same. It should be noted that this is only for the sake of illustration, and the multi-layer core board group 100 only includes 4 core boards as an example. In practical applications, the multi-layer core board group 100 may include more than 10 layers of core boards. That is, the number of core boards included in the multilayer core board group 100 may be more than two layers. There is no limitation on the manner in which the multiple core boards included in the multi-layer core board set 100 are fixed to each other.

One of the wide sides 11A, 12A, 13A, 14A of each core board 11, 12, 13, 14 may have a non-line area A1 and a line area A2 respectively, and at least one line may be formed on the line area A1, each The circuit in circuit area A1 is commonly known as PCB Layout. The circuit area A1 of the core board 11 is provided with four marking units 111, 112, 113, 114, and the four marking units 111, 112, 113, 114 are roughly arranged on the four corners of a virtual rectangle B3; the core board 12 The circuit area A1 is provided with four marking units 121, 122, 123, 124, and the four marking units 121, 122, 123, 124 are roughly arranged at the four corners of a virtual rectangle B4; similarly, the core board 13 The four marking units 131, 132, 133, 134 are roughly arranged at the four corners of the virtual rectangle B1, and the four marking units 141, 142, 143, 144 of the core board 14 are roughly arranged at the four corners of the virtual rectangle B2. corner. The appearance of each virtual rectangle B1, B2, B3, B4 can be reduced in proportion to the appearance of each core board, and the appearance of different virtual rectangles B1, B2, B3, B4 is that the appearance of the core board is different scaled down.

As shown in Figures 4 and 5, in the image obtained after the scanning device scans the multi-layer core board group 100, each marking unit 111~114, 121~124, 131~ 134, 141~144 are set without overlapping with each other, that is to say, when scanning According to the image obtained after the scanning device scans the multi-layer core board set 100, each marking unit 111-114, 121-124, 131-134, 141-144 is arranged in a dislocation manner.

In practical applications, in the scanning image obtained after the scanning device scans the multi-layer core board group 100, the marking units 111-114, 131-134 included in the core boards 11, 13 may be roughly located on the same virtual axis C1, and the core boards The marking units 121~124, 141~144 contained in 12 and 14 may be roughly located on another virtual axis C2, and the marking units 111~114, 131~134 do not overlap each other on the virtual axis C1, and the marking units 121 to 124 and 141 to 144 do not overlap each other on the virtual axis C2. It should be emphasized that the positions of frame Z and all marked units shown in FIG. The position of does not represent the actual situation of the multilayer core board assembly 100 in the scanned image.

In practical applications, each marking unit may be a structure that does not penetrate the core board, and each marking unit may be manufactured together during the process of manufacturing the circuit in the circuit area of the core board. Of course, in special applications, each marking unit can also be a perforation through the core board.

The scanning device is not limited to the X-ray scanning device, any scanning device with penetrating light belongs to the applicable scope of the scanning device referred to here, or any scanning device that can be used to scan the multi-layer core board group 100 to The scanning device for obtaining the coordinates of each marking unit also belongs to the applicable scope of the scanning device referred to in the present invention.

Please refer to FIG. 5 and FIG. 6 together. In the scanning step S11 and the corner coordinate calculation step S12, the processor can use the four marking unit coordinates 111, 112, 113, 114 (121~124, 131 ~134, 141~144), and the actual size data of each core board, based on which the four corner coordinates C11, C12, C13, C14 (C21~C24, C31~C34, C41~C44) of each core board are calculated . For example, the processor can enlarge the coordinates 111, 112, 113, 114 (121~124, 131~134, 141~144) of the four marking units by a predetermined ratio, so as to obtain the four corner coordinates C11, C12, C13, C14 (C21~C24, C31~C34, C41~C44). Need to explain Yes, Figure 6 shows the deformation of each core board in an exaggerated manner, but Figure 6 does not represent the actual situation; in addition, in order to clearly illustrate the content of each process step of the present invention, in Figures 6 to 8 , and each coordinate is marked by a circle, rhombus, triangle, square, or pentagon.

As shown in Figure 7, after the processor obtains the four corner coordinates C11, C12, C13, C14 (C21~C24, C31~C34, C41~C44) of each core board, when the processor executes the center of gravity coordinate calculation step S13, It can be the average of all the X-axis coordinates of the four corner coordinates C11, C12, C13, C14 (C21~C24, C31~C34, C41~C44) of each core board and then take the average value to obtain the center of gravity coordinate G1( G2, G3, G4) X-axis coordinate values, and sum up all Y-axis coordinates of the four corner coordinates C11, C12, C13, C14 (C21~C24, C31~C34, C41~C44) of each core board Then take the average value to obtain the Y-axis coordinate value of the center of gravity coordinate G1 (G2, G3, G4).

After the processor obtains the center-of-gravity coordinates G1 (G2, G3, G4) of each core board, when the processor executes the average center-of-gravity coordinate calculation step S4, the X-axis coordinates of all the center-of-gravity coordinates G1, G2, G3, and G4 can be summed Then take the average value to obtain the X-axis coordinate value of the average center-of-gravity coordinate AVG, and sum up the Y-axis coordinates of all center-of-gravity coordinates G1, G2, G3, and G4 and then take the average value to obtain the Y-axis coordinate value of the average center-of-gravity coordinate AVG value. After the processor calculates the average center of gravity coordinate AVG, it can use the length and width of the circuit board in the standard size information of the circuit board to calculate the four reference corner coordinates SG1, SG2, and SG3 with the average center of gravity coordinate AVG as the center. , SG4, and the four reference corner coordinates SG1, SG2, SG3, SG4 can be connected with each other to form the reference rectangle RE. After the processor calculates the four reference corner coordinates SG1, SG2, SG3, SG4, the processor can respectively take each reference corner coordinate SG1, SG2, SG3, SG4 as the center, and define four Initial allowable ranges TR1, TR2, TR3, TR4.

After the processor defines four initial allowable ranges TR1 , TR2 , TR3 , TR4 , the processor will execute the adjustment step S17 . When the processor executes the adjustment step S17, the processor may first determine the corner coordinates included in each initial allowable range TR1, TR2, TR3, TR4 Quantity, each reference corner coordinates SG1, SG2, SG3, SG4 and the straight-line distance of each adjacent corner coordinates, etc., according to which the average center of gravity coordinate AVG and the four reference corner coordinates SG1, SG2, SG3, SG4 Which direction to move, so that each initial allowable range TR1, TR2, TR3, TR4 can cover the maximum number of corner coordinates.

More specifically, as shown in FIG. 7, after the processor executes the allowable range defining step S16, it is assumed that the initial allowable range TR1 located in the upper left corner of the figure contains only three corner coordinates C11, C21, and C31. One of the corner coordinates C41 falls outside the initial allowable range TR1, and is located in the initial allowable range TR4 in the lower left corner of the figure. It only includes three corner coordinates C14, C24, and C34, and the corner coordinate C44 is not located Within the initial allowable range TR4. The other two initial allowable ranges TR2 and TR3 in the figure respectively include four adjacent corner coordinates C12, C22, C32, C42 and C13, C23, C33, C43.

In this case, when the processor executes the adjustment step S17, it may adjust the two reference corner coordinates SG1 and SG4 located in the upper left corner and the lower left corner in the figure. After the reference corner coordinates SG1 and SG4 are adjusted, the corresponding initial The allowable ranges TR1 and TR4 will be adjusted synchronously, and after the processor adjusts the position of each initial allowable range TR1 and TR4, it will judge the number of corner coordinates contained in each initial allowable range TR1 and TR4, and the processor will also It will judge whether the deformation of the rectangle formed by the adjusted four reference corner coordinates and the reference rectangle RE on the X-axis and Y-axis is not greater than the allowable deformation amount. If the processor judges that the reference corner coordinates of the part are moved, The adjusted initial allowable range can cover more corner coordinates, but the deformation of the rectangle formed by the adjusted four reference corner coordinates and the reference rectangle RE on the X-axis and Y-axis is greater than the allowable deformation. Then the processor will adjust the unadjusted reference corner coordinates, so that while increasing the number of corner coordinates covered by each initial allowable range, the rectangle formed by the adjusted four reference corner coordinates will still be , and the deformation amount of the reference rectangle RE on the X-axis and the Y-axis is not greater than the allowable deformation amount.

Bearing in mind, in practical applications, in the situation shown in Figure 7, the processor may first calculate a lateral distance between each corner coordinate and the adjacent initial allowable range on the X-axis and the Y-axis and a vertical distance, and then determine the moving distance of at least one corner coordinate on the X-axis and the Y-axis according to the horizontal distance and the vertical distance corresponding to each corner coordinate. Specifically, as shown in FIG. 7, in the adjustment step S17, the processor may first calculate the corner coordinates C41, C44 that are not within the initial allowable range TR1, TR4 and the corresponding initial allowable range TR1, TR4 on the X-axis and the Y-axis, and calculate the difference between the other corner coordinates and the adjacent initial allowable ranges on the X-axis and Y-axis, and then the processor can determine whether to adjust the initial allowable range TR1, TR4, so that When the initial allowable ranges TR1 and TR4 cover the corner coordinates C41 and C44, whether other corner coordinates will deviate from the adjacent initial allowable ranges is used to determine how to adjust each reference corner coordinate.

That is to say, in the situation shown in FIG. 7, the processor may, for example, first try to adjust the reference corner coordinates SG1 and SG4 located in the upper left corner and lower left corner of the figure, without adjusting the coordinates SG1 and SG4 located in the upper right corner and lower right corner of the figure. The reference corner coordinates SG2 and SG3 are adjusted to cover the four adjacent corner coordinates C11, C21, C31, C41 and C14, C24 and C34 respectively after adjusting the initial allowable range TR1 and TR4 in the upper left corner of the figure , C44; assuming that the processor only adjusts the two reference corner coordinates SG1 and SG4 in the figure, and then judges the adjusted two reference corner coordinates SG1 and SG4 and the two unadjusted reference corner coordinates SG2 and SG3 If the deformation of the rectangle formed together with the reference rectangle RE on the X-axis and Y-axis exceeds the allowable deformation range, the processor will adjust the two reference corner coordinates SG2 and SG3 located in the upper right corner and lower right corner of the figure , so that the initial allowable ranges TR2 and TR3 corresponding to the two datum corner coordinates SG2 and SG3 adjust the position while still covering the four adjacent corner coordinates until the adjusted four datum corners The rectangle formed by the coordinates and the deformation amount of the reference rectangle RE on the X-axis and the Y-axis all meet the allowable deformation range. When the processor determines that each initial allowable range after adjustment covers more adjacent corner coordinates, and the rectangle formed by the adjusted four reference side coordinates is different from the deformation of the reference rectangle RE on the X-axis and Y-axis , all conform to the allowable deformation range, the adjusted reference corner coordinates are the optimized corner coordinates FG1, FG2, FG3, FG4, and the initial allowable ranges after the adjusted positions are the optimized allowable ranges FR1, FR2, FR3, FR4, four optimized corner coordinates FG1, FG2, The rectangle RE2 formed by the connection of FG3 and FG4 is the optimized quadrilateral.

It should be noted that, when the processor executes the adjustment step S17, the four reference corner coordinates SG1, SG2, SG3, and SG4 can also be adjusted without changing the appearance of the reference rectangle (for example, to make the four reference corners The coordinates SG1, SG2, SG3, and SG4 are simultaneously translated in the X-axis direction, so that the four reference corner coordinates SG1, SG2, SG3, and SG4 are simultaneously translated in the Y-axis direction, so that the four reference corner coordinates SG1, SG2, SG3, and SG4 Rotate around the average center of gravity coordinate AVG) to try to increase the number of adjacent corner coordinates covered by the four initial allowable ranges TR1, TR2, TR3, and TR4. If the processor tries, it cannot make the four initial When the number of adjacent corner coordinates covered by the allowable ranges TR1 , TR2 , TR3 , TR4 increases, the processor tries to adjust at least one reference corner coordinate SG1 , SG2 , SG3 , SG4 individually.

Please refer to FIG. 9 , which is a schematic flow chart of the hole forming method of the multilayer circuit board of the present invention. The method for forming a hole in a multilayer circuit board of the present invention includes the following steps: a preparation step SX1: prepare a multilayer core board group, the multilayer core board group is composed of a plurality of core boards stacked on each other, and any marking unit is placed on a The longitudinal direction (for example, the Z-axis direction in FIG. 3 ) does not completely overlap with any marking unit, and the longitudinal direction and a normal line of a surface of the multilayer core board group (for example, the broad side 11A of the first core board 11) mutually overlap each other. Parallel; a scanning step SX2: control a scanning device to scan the multi-layer core board group to obtain a mark coordinate of each marking unit of each core board; a corner coordinate calculation step SX3: use four marks corresponding to each core board Coordinates and a core board information corresponding to each core board, calculate the four corner coordinates of each core board; the core board information includes at least one core board size; a center of gravity coordinate calculation step SX4: use the four sides of each core board Angular coordinates, calculate a center of gravity coordinates of each core plate; an average center of gravity coordinates calculation step SX5: use a plurality of center of gravity coordinates to calculate an average center of gravity coordinates; Calculation step SX6 of a reference corner coordinate: using the average center of gravity coordinates and a circuit board standard size information to calculate four reference corner coordinates; where the four reference corner coordinates are connected by four virtual line segments to form a reference Rectangle; an allowable range defining step SX7: taking the coordinates of each reference corner as the center, and defining four initial allowable ranges with a preset allowable value as a radius; an adjustment step SX8: adjusting the average center of gravity coordinates and the four reference corners Coordinates, to obtain an optimized center of gravity coordinates and four optimized corner coordinates; wherein, after the four optimized corner coordinates are connected by four virtual line segments, an optimized quadrilateral can be formed; the deformation of the optimized quadrilateral and the reference rectangle in the X-axis direction And the amount of deformation of the optimized quadrilateral and the reference rectangle in the Y-axis direction is not greater than an allowable amount of deformation; among them, four optimized allowable ranges can be defined by taking the coordinates of each optimized corner as the center and taking the preset allowable value as the radius , and the total number of initial corner coordinates falling within each optimization allowable range is not less than the total number of initial corner coordinates falling within each initial allowable range; a calculation step SX9: use the reference rectangle and the optimized quadrilateral to calculate the multi-layer core board A deformation amount (i.e. expansion and contraction value) of the group; a forming step SX10: control a hole forming device (such as a laser perforation device), and form at least one hole in the multilayer core board group according to the deformation amount and a circuit board hole position information Holes, so that the multi-layer core board is formed into a multi-layer circuit board.

The scanning step SX2, corner coordinate calculation step SX3, center-of-gravity coordinate calculation step SX4, average center-of-gravity coordinate calculation step SX5, reference corner coordinate calculation step SX6, allowable range definition SX7, and adjustment step SX8 in this embodiment are similar to the aforementioned scanning step S2 , calculation step S3 of corner coordinates, step S4 of calculation of center of gravity coordinates, step S5 of calculation of average center of gravity coordinates, step S6 of calculation of reference corner coordinates, definition of allowable range S7 and step S8 of adjustment are the same, and will not be repeated here.

In the forming step SX10 , hole forming equipment may be used to form through holes or blind holes in the multi-layer core board according to requirements, and no limitation is imposed here.

In summary, the method for calculating the expansion and contraction value of the circuit board and the hole forming method for the multi-layer circuit board of the present invention can better calculate the expansion and contraction value of the circuit board, thereby greatly reducing the cost of related hole forming equipment. When blind holes or through holes are formed on the multi-layer core board group, the probability of problems such as partial breakage will occur.

The above descriptions are only preferred feasible embodiments of the present invention, and do not limit the patent scope of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the scope of protection of the present invention. .

S11~S18: Process steps

Claims (10)

A method for calculating the expansion and contraction value of a circuit board, which is used for execution by a processor of a circuit board forming device, so that the circuit board forming device can calculate the value before drilling a multilayer core board group. The expansion and contraction value of the multi-layer core board group, the multi-layer core board group is composed of a plurality of core boards superimposed on each other, and the multi-layer core board group will become a multi-layer core board group after being drilled by the circuit board forming equipment. Layer circuit board, each of the core boards has four marking units, any one of the marking units of the multilayer core board group does not completely overlap any one of the marking units in a longitudinal direction, and the longitudinal direction is the same as the A normal line of a surface of the multilayer core board group is parallel to each other; the calculation method of the expansion and contraction value of the circuit board includes: a scanning step: controlling a scanning device to scan the multilayer core board group to obtain each of the A mark coordinate of each of the mark units of the core board; a corner coordinate calculation step: use the four mark coordinates corresponding to each of the core boards and a core board information corresponding to each of the core boards to calculate The four corner coordinates of each of the core boards; the core board information at least includes a core board size; a center of gravity coordinate calculation step: using the four corner coordinates of each of the core boards to calculate each of the A center of gravity coordinate of the core board; an average center of gravity coordinate calculation step: using a plurality of the center of gravity coordinates to calculate an average center of gravity coordinate; a reference corner coordinate calculation step: using the average center of gravity coordinates and a circuit board standard size information, Four reference corner coordinates are calculated; wherein, after the four reference corner coordinates are connected by four virtual line segments, a reference rectangle can be formed; a step of defining an allowable range: taking each of the reference corner coordinates as the center, And define four initial allowable ranges with a preset allowable value as the radius; an adjustment step: adjust the average center-of-gravity coordinates and the four reference corner coordinates to obtain an optimized center-of-gravity coordinate and four optimized corner coordinates ; Wherein, after the four optimized corner coordinates are connected by four virtual line segments, an optimized quadrilateral can be formed; the deformation of the optimized quadrilateral and the reference rectangle in the X-axis direction and the optimized quadrilateral and the benchmark The amount of deformation of the rectangle in the Y-axis direction is not greater than an allowable amount of deformation; wherein, taking each of the optimized corner coordinates as the center and taking the preset allowable value as the radius to define four optimized allowable ranges, And the total number of the initial corner coordinates falling within each of the optimization allowable ranges is not less than the total number of the initial corner coordinates falling within each of the initial allowable ranges; a calculation step: using the reference rectangle And a deformation amount of the multi-layer core plate group is calculated by the optimized quadrilateral. The calculation method for the expansion and contraction value of the circuit board as described in claim 1, wherein, in the adjustment step, the coordinates of the average center of gravity and the coordinates of the four reference corners are controlled to simultaneously translate in the X-axis direction, At least one action of translation in the Y-axis direction and rotation around the average center of gravity coordinates. The method for calculating the expansion and contraction value of the circuit board according to claim 1, wherein the X coordinate of the center of gravity coordinates of each of the core boards is the X coordinate of the four corner coordinates of the core board Average; the Y coordinate of the center of gravity coordinates of each of the core plates is the average of the Y coordinates of the four corner coordinates of the core plate; the X coordinate of the average center of gravity coordinates is a plurality of the cores The average of the X coordinates of the center of gravity coordinates of the board; the Y coordinate of the average center of gravity coordinates is the average of the Y coordinates of the center of gravity coordinates of a plurality of core plates. The calculation method for the expansion and contraction value of the circuit board as described in claim item 1, wherein, in the adjustment step, first calculate the coordinates of each of the corners and the adjacent The initial allowable range is respectively a horizontal distance and a vertical distance on the X-axis and the Y-axis. According to the horizontal distance and the vertical distance corresponding to each of the corner coordinates, the reference corner coordinates are determined to be The moving distance of X-axis and Y-axis. The calculation method for the expansion and contraction value of the circuit board as described in claim 1, wherein each of the core boards includes a circuit area and a non-circuit area, and the four marking units included in each of the core boards are formed In the non-circuit area, and each of the marking units does not penetrate the core board; the four marking units of each of the core boards are located at the four corners of a virtual rectangle, and the shape of the virtual rectangle is The shape of the core board is scaled down in equal proportions, and the different shapes of the virtual rectangle are formed by shrinking the shape of the core board in different proportions. A method for forming a hole in a multilayer circuit board, which includes: a preparation step: preparing a multilayer core board group, the multilayer core board group is composed of a plurality of core boards stacked on each other, and any one of the marking units is placed on a The longitudinal direction does not completely overlap with any one of the marking units, and the longitudinal direction is parallel to a normal line of a surface of the multilayer core board group; a scanning step: controlling a scanning device to perform a scanning operation on the multilayer core board group Scan to obtain a mark coordinate of each of the mark units of each of the core plates; a corner coordinate calculation step: use the four mark coordinates corresponding to each of the core plates and the corresponding A core board information, calculate the four corner coordinates of each said core board; said core board information at least includes a core board size; a center of gravity coordinate calculation step: use the four said corners of each said core board Coordinates, calculate a center of gravity coordinate of each described core plate; An average center of gravity coordinate calculation step: utilize a plurality of described center of gravity coordinates to calculate An average center of gravity coordinates; a reference corner coordinate calculation step: using the average center of gravity coordinates and a circuit board standard size information to calculate four reference corner coordinates; wherein, the four reference corner coordinates pass through four virtual line segments After being connected, a reference rectangle can be formed; an allowable range definition step: take each of the reference corner coordinates as the center, and define four initial allowable ranges with a preset allowable value as the radius; an adjustment step: adjust the The average center of gravity coordinates and the four reference corner coordinates are used to obtain an optimized center of gravity coordinates and four optimized corner coordinates; wherein, after the four optimized corner coordinates are connected by four virtual line segments, an optimized Quadrilateral; the deformation amount of the optimized quadrilateral and the reference rectangle in the X-axis direction and the deformation amount of the optimized quadrilateral and the reference rectangle in the Y-axis direction are not greater than an allowable deformation amount; wherein, each of the The optimized corner coordinates are centered, and four optimized allowable ranges can be defined by the radius of the preset allowable value, and the total number of the initial corner coordinates falling within each of the optimized allowable ranges is not less than The total number of the initial corner coordinates within each of the initial allowable ranges; a calculation step: using the reference rectangle and the optimized quadrilateral to calculate a deformation amount of the multi-layer core plate group; a forming step: controlling A hole forming device forms at least one hole in the multilayer core board group according to the deformation amount and a circuit board hole position information, so that the multilayer core board group becomes a multilayer circuit board. The method for forming a hole in a multi-layer circuit board according to claim 6, wherein, in the adjusting step, the coordinates of the average center of gravity and the four reference corner coordinates are simultaneously translated in the X-axis direction and translated in the Y-axis At least one of direction translation and rotation around the Z axis. The method for forming a hole in a multilayer circuit board according to claim 6, wherein the X coordinate of the center of gravity coordinates of each of the core boards is the average of the X coordinates of the four corner coordinates of the core board; The Y coordinate of the center of gravity coordinates of each of the core plates is the average of the Y coordinates of the four corner coordinates of the core plates; the X coordinate of the average center of gravity coordinates is the average of the coordinates of the center of gravity of multiple core plates The average of the X coordinates of the center of gravity coordinates; the Y coordinate of the average center of gravity coordinates is the average of the Y coordinates of the center of gravity coordinates of multiple core plates. The method for forming a hole in a multilayer circuit board according to claim 6, wherein, in the adjustment step, the coordinates of each of the corners and the adjacent initial allowable ranges on the X-axis and the Y-axis are first calculated. A horizontal distance and a vertical distance. According to the horizontal distance and the vertical distance corresponding to each of the corner coordinates, the moving distances of the reference corner coordinates on the X-axis and the Y-axis are determined respectively. The method for forming a hole in a multilayer circuit board according to claim 6, wherein each of the core boards includes a circuit area and a non-circuit area, and the four marking units included in each of the core boards are formed on the The non-line area, and each of the marking units does not penetrate the core board; the four marking units of each of the core boards are located at the four corners of a virtual rectangle, and the shape of the virtual rectangle is the The shape of the core board is scaled down, and the different shapes of the virtual rectangle are obtained by reducing the shape of the core board in different proportions.

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