JP3030749B2 - Drilling method and apparatus for printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for drilling a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, in manufacturing a circuit board, a method of printing a large number of circuit patterns on a single large-area substrate and then cutting and separating each circuit pattern to obtain a large number of circuit boards has been used. ing. At the time of this cutting, a guide hole is provided in the substrate, the guide hole is inserted into a guide pin provided in the processing apparatus, and cutting is performed sequentially. Therefore, the guide hole is the basis for determining the cutting position,
Drilling in the correct position is required. For example, when a guide pin is passed through a plurality of guide holes, the guide pins cannot be inserted unless the interval between the two guide holes is accurate.

[0003] As a drilling device for making such a drilling, a mark is previously attached to a drilling position when a circuit pattern is printed, and this mark is attached to a TV camera or X-ray provided in the drilling device. A device is used in which an image is taken by an imaging means such as a line camera, the image is processed, and a hole or the like is moved to a position obtained as a result to drill.

As one type of such a drilling device, for example, when one hole is drilled on each side of a printed circuit board, first, the center position of one identification mark is detected, and then the other mark is detected. The center position is detected, and the difference between the distance between the two marks and the distance between the desired holes previously input to the central processing unit (CPU) is evenly divided by half to set the drilling position. I do. Drilling is performed by moving the drilling means so as to be accurately located at the drilling position.

[0005] As another means, in order to improve the efficiency of drilling, two sets of units each comprising an imaging camera, an XY table, a drilling means, and the like are provided, and one of the units is fixed. A method of making a hole by moving the position of the other unit to the assigned position is also adopted (JP-A-3-277411).

[0006]

However, the above-mentioned prior art has the following problems. First, in the former, there is a problem that a large and high-precision XY table is required to move the drilling means to both drilling positions accurately, and the cost is high. In the latter, two units are used. There is still a problem of high cost. This is particularly remarkable when an X-ray camera is used as the imaging means.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus capable of easily and accurately drilling a printed circuit board without requiring a large XY table.

[0008]

In order to achieve the above object, a method of punching a substrate according to the present invention comprises the steps of: forming a printed circuit board having at least one pair of identification marks on the printed circuit board; The first identification mark of the printed circuit board is gripped by a gripping member that moves in the direction in which it is arranged, so that the first identification mark of the printed circuit board enters the image area of the imaging unit installed on the moving unit that can move independently of the gripping member. Setting, imaging the first identification mark by the imaging means, and the position data of the gripping member obtained by the movement amount detecting means interlocking with the gripping member;
Based on the image processing result of the image obtained by the imaging means,
The position of the first identification mark is detected, and then the gripping member is moved to move the printed circuit board.
The identification mark is set so as to fall within the image area of the imaging means, and the second identification mark is imaged by the imaging means.
The position of the second identification mark is detected based on the position data of the gripping member obtained by the movement amount detection unit and the image processing result of the image obtained by the imaging unit, and the first and second identification marks are detected. Is compared with the position data of the desired hole stored in the storage circuit in advance, the error is sorted, and the first correction value and the second correction value for correcting the position of the first identification mark are compared. And a second correction value for correcting the position of the identification mark, and a second drilling position is calculated based on the second correction value.
That the drilling means is moved by the moving means, the drilling unit
By then drilling into the second drilling position, by moving the printed circuit board by moving the gripping member, the first identification mark is again set to fall within the image area of the image pickup means, moving amount The first hole in which the position of the first identification mark is corrected by the first correction value based on the position data of the gripping member obtained by the detection means and the position data of the first and second identification marks. It is characterized in that a drilling position is calculated, the drilling means is moved by the moving means , and the hole is drilled at the first drilling position by the drilling means .

Note that the first and second correction values may be set to halves of the error. Further, a drilling device for a printed board for applying this drilling method includes a work table on which a printed board provided with at least one pair of identification marks is placed, and a work table on which the pair of identification marks are arranged.
Gripping member for moving the printed circuit board in the direction, imaging means for imaging these identification marks, an image processing apparatus for processing an image obtained by the imaging means, and a central processing unit for inputting data from the image processing apparatus. The apparatus, the only piercing means controlled by the central processing unit to pierce the printed circuit board, the imaging means and the piercing means.
Support member and are those in which a moving means for moving independently, the work table is provided with a displacement detection means to output position data of this gripping member to the central processing unit, a central processing The apparatus includes a storage circuit for storing data output from the movement amount detection means and the image processing apparatus, a position of both identification marks is obtained from the data from the movement amount detection means and the image processing result, and a storage circuit And an arithmetic circuit for calculating a drilling position in which the position error of the identification mark has been corrected based on the desired hole position data stored in the memory.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. 2 and 3 show the entire structure of the drilling device according to the present invention, in which an image pickup means 2 for picking up a transmission image of a work to be irradiated with X-rays and a drilling means 3 are arranged below a table 1. It is set up. A printed circuit board 4 as a work is placed on the table 1 and can be transported.
As the imaging means 2, an II (Image Intensifier) type X-ray camera which uses a small amount of X-rays and has high sensitivity is employed. This X-ray camera is a PbO (lead oxide) vidicon type X-ray camera used in the prior art.
It has a much longer lifespan than line cameras and is more economical.

Above the table 1, support members 5 are provided at predetermined intervals, and X-ray irradiating means 6 is supported on the support members 5. A protective cover 7 is fixed to the lower surface of the support member 5. X inside the protective cover 7
An X-ray leakage prevention means for preventing the passage of the X-ray and the X-ray is provided.

The X-ray irradiating means 6 is connected to a protective tube 8 constituting a passage 8a for irradiating X-rays. A shutter 9 is provided in the protective tube 8 so as to cross the X-ray passage 8a, and the shutter is driven forward and backward by a shutter cylinder 10 to open and close the passage 8a. A vertical guide groove 8b is formed on the outer periphery of the protection tube 8. In order to enhance the effect of preventing X-ray leakage, a metal piece 8d made of lead or the like is embedded.

Below the protective tube 8, a protective tube 11 having an X-ray passage 11a communicating with the passage 8a is provided with a printed circuit board 4.
Are provided so as to be able to approach and separate from. The protective tube 11 also serves as a clamper for pressing the printed circuit board 4 on the table 1 and is fixed to the lower end of a cylindrical body 12 fitted to the outer periphery of the protective tube 8. A plate 13 having a guide 13a on its inner surface slidable in the guide groove 8b is provided integrally with a part of the cylindrical body 12. Below the support member 5, a cylinder 14 is provided as means for lowering the protection cylinder 11 in parallel with the cylinder 12. The cylinder 14 transmits the extension of the cylinder rod 14 a to the cylinder 12 via the connecting member 15 fixed to the cylinder 12 to lower the protection cylinder 11. The protection cylinder 11 is provided with a brake unit (not shown), and can be stopped at an arbitrary position via the control unit. The protection cylinder 11 is lifted by the cylinder 14, and a return spring 16 is hooked on the connecting member 15 so that the protection cylinder 11 does not drop by its own weight during air-down.

A sensor support plate 17 is suspended from both sides of the protective tube 8, and a sensor 18 is fixed inside the lower end of the sensor support plate 17. The sensor 18 detects whether the printed circuit board 4 is positioned below the X-ray paths 8a and 11a, and the shutter 9 is opened and closed by the output of a detection signal from the sensor.

Although not shown, a shielding member as X-ray leakage prevention means is provided around X-ray passages 8a and 11a provided below the X-ray irradiation means 6. As the shielding member, a lead-containing synthetic resin sheet similar to that of the prior art is used, and two skirts provided with vertical cuts at appropriate intervals are provided side by side. When irradiating with X-rays, the skirt portion hits the work on the table, and by sealing the inside, it is possible to shield the X-rays from leaking to the surroundings.

In the vicinity of the position between the table 1 and the substrate 4 where operations such as imaging and drilling are to be performed,
The work receiver 21 is located. The work receiver 21 is provided with a mirror that reflects the light of the sensor 18, and the presence or absence of the substrate can be detected by blocking the light with the printed circuit board 4.

Next, an XY table mechanism (moving means) 22
Will be described. The XY table mechanism moves the imaging means 2 and the drilling means 3 located below the table 1 to a working position. As shown in FIG. 4, the XY table mechanism includes a support plate 23 fixed to an apparatus main body (not shown). A pair of rails 24 and 25 are provided on the upper surface in the left-right direction (X direction) of FIG. Sliders 2 slidable in the X direction are provided on the rails 24 and 25.
6a, 26b, 26c, and 26d are mounted, and sliders 27a, 27b, 27c, and 27d guided in the vertical direction (Y direction) in FIG. 4 are provided on the upper surfaces of the sliders 26a, 26b, 26c, and 26d. It is fixed with the surface to be fitted facing upward. This slider 2
The sliders 6a to 26d and the sliders 27a to 27d are disposed so as to face in directions substantially orthogonal to each other. This slider 27a ~
A pair of rails 28 and 29 extending in the Y direction are slidably fitted on 27d. A motor 30 is fixed on the support plate 23, and a lead screw 31 connected to a drive shaft of the motor is rotatably disposed. A nut 32 is screwed into the lead screw 31, and the nut 32 is connected to the slider 2 via a nut holder 33.
6a and 27a. Therefore, the motor 3
When the lead screw 31 is rotated by the drive of No. 0, the nut 32, the nut holder 33, the sliders 26a, 27a
Moves in the X direction. At this time, since they are connected by the rail 28, the sliders 26b and 27b also move integrally.

A moving table 34 is provided on the rails 28 and 29.
Is fixed. As shown in FIG. 5, a motor 35 is fixed on the moving table 34, and a lead screw 36 connected to a drive shaft of the motor 35 is rotatably disposed. A nut 37 is screwed into the lead screw 36, and the nut 37 is fixed to a nut holder 38. The nut holder 38 is provided with the sliders 26b, 2
7b (see FIG. 4).
Is not fixed against. In this configuration, when the lead screw 36 rotates by driving the motor 35, the nut 37 tries to move in the Y direction, but the nut holder 38 is fixed to the sliders 26b and 27b, and the slider 26b fits on the rail 25. And cannot move in the Y direction. Therefore, when the lead screw 36 rotates by driving the motor 35, the nut 37 does not move, and the motor 35 and the moving table 34 move in the Y direction. Since the XY table mechanism 22 has the above-described configuration, the moving table 34 is movable in the XY directions by driving the motors 30 and 35.

The XY table mechanism 22 is used for the image area 2
a (see FIG. 10), which moves the drilling means 3 and is extremely small.

Next, referring to FIGS.
And the drilling means 3 will be described. Moving table 3
4, a support plate 39 is erected, and the support plate 39
X serving as an image pickup means is provided via the connecting plate
The line camera 2 is held. The X-ray camera 2 is connected to an image processing device, a central processing unit, and the like, which will be described later.
The operation of the above-described XY table mechanism 22 and the like is controlled based on the result of image processing of capturing a transmission image of the work.

A pair of rails 42 and 43 are mounted on the opposite surface of the support plate 39. A rail guide 44a is provided on a holding frame 44 for holding the drilling means 3 as a processing means, and the rail guide 44a is slidably fitted to the rails 42 and 43. Drilling means 3
Is constituted by a spindle motor 3a, a collet chuck 3b fixed to the upper end thereof, and a drilling member such as a drill 3c held by the collet chuck 3b. Drill 3c by driving spindle motor 3a
Are rotated to punch the printed circuit board 4. A chip cover 45 is attached to the upper end of the drilling means 3.

Next, a driving mechanism 46 for driving the drilling means 3 in the vertical direction (z direction) will be described below with reference to FIG. FIG. 7 shows FIG. 5 for easy understanding of the configuration.
FIG. 4 is a view taken along a line BB. A lead screw 4 extending in the z direction is attached to the support plate 39 via a mounting member 47.
8 is rotatably mounted. This lead screw 4
A nut 49 is screwed into 8, and this nut is fixed to the above-mentioned holding frame 44 via a nut holder 50. The upper end of the lead screw 48 is a belt wheel 51
It is connected to. The motor 5 is attached to the mounting member 47.
2 is held, and the drive shaft of the motor 52 is
3 is connected. Belt 5 for belt wheels 51 and 53
4 is hung. Therefore, when the belt wheel 53 is rotated by the drive of the motor 52, the rotation is transmitted to the belt wheel 51 via the belt 53, whereby the lead screw 48 is rotated. Then, the nut holder 50 and the holding frame 44 move in the Z direction integrally with the nut 49, and the drilling means 3 held by the holding frame moves up and down.

A laser marker (not shown) is provided on the lower surface of the support member 5 located above the work table 1 along with the protective cover 7. The laser marker has an extremely small line width and can set a straight line mark by a laser beam on the work table surface.

Next, a description will be given of a linear scale as an example of a gripping member and its moving amount detecting means. As shown in FIG. 8, on the upper surface of the work table 1, there is provided a step 1a whose upper part in FIG. 8 is lowered, and on this lowered surface 1b, a linear guide 61 and a linear scale 62 are provided. A gripping member 63 is attached to the linear guide 61 so as to be movable in parallel. The gripping member 63 grips the printed circuit board 4 and transports it on the work table 1.
In this embodiment, in order to reduce the cost, the apparatus is configured to be manually movable without using a motor or the like. The linear scale 62 is a slider (not shown) connected to the holding member 63.
Thus, the data of the position of the gripping member is output, and a detection head having a magnetoresistive thin film element or the like built in a slider is provided. In this embodiment, MR Magnescale (trademark: manufactured by Sony Magnescale Co., Ltd.) is employed. The printed circuit board 4 is provided at the tip of the holding member 63.
Is provided.

Next, the control means in this embodiment will be described with reference to the block diagram shown in FIG. Of course, a central processing unit (CPU) is at the center of the control means. The CPU 64 is connected to the drilling means 3, the X-ray irradiation means 6, and the XY table mechanism 22 so as to be controllable.
The X-ray irradiating means 6 allows the irradiated X-ray to pass through the work,
An X-ray camera 2 transmits the transmitted image of the mark
It is provided so that an image can be taken. An image processing device 65 is connected to the X-ray camera 2. The image processing device performs image processing on the image data transmitted from the X-ray camera 2 and performs CPU processing.
64 is connected so as to be able to output. Further, the CPU 64 is connected to the linear scale 62, which is a means for detecting the amount of movement of the gripping member 63, the storage circuit 66, and the arithmetic circuit 67. The linear scale 62 can output the position data of the gripping member 63 to the CPU 64, and the data and the image data output from the image processing device 65 can be stored in the storage circuit 66. The arithmetic circuit 67 determines the position of the hole to be drilled by using the position data of the linear scale, the result of the image processing, and the data set in advance based on the instruction from the CPU 64, and outputs the result to the CPU 64. It is. In addition, a monitor TV (not shown) is connected to the CPU 64.

Next, the procedure for drilling a predetermined position on the printed circuit board 4 according to the present invention will be described with reference to the flowchart shown in FIG. In this embodiment, the printed board to be drilled is a multilayer board in which the circuit pattern and the identification mark for drilling are not exposed. The identification marks are provided symmetrically on both the left and right sides of the printed circuit board. The left mark is a first identification mark P1, and the right mark is a second identification mark P2 (see FIGS. 10 to 12). . Prior to the drilling operation, the second identification mark P2
Is determined from the surface condition of the printed circuit board 4 or the like and marked with an oil-based pen or the like.

In the step of setting the printed circuit board 4 on the work table 1, first, the printed circuit board is gripped by the holding member 63 on the work table 1 (see FIG. 10 ). Next, X
While being monitored by the monitor of the line camera 2, the mark previously attached is aligned with the line of the laser marker, and is gripped by the gripping member 63, and the gripping member is manually moved to form the first identification mark. Set so that P1 is within the image area 2a of the X-ray camera 2 (see FIG. 10) (8)
1).

Next, the first identification mark P1 is imaged by the X-ray camera 2 and the linear scale 62 is
Thus, the position of the gripping member 63 is detected, and the position data (L1) is output to the CPU 64 and stored in the storage circuit 66 (82). The image captured at this time is subjected to image processing by the image processing device 65, and the position of the first identification mark P1 is detected from the data of the image processing result and the linear scale position data (83). The center coordinates (X1, Y1) of the first identification mark P1 are recorded in the storage circuit 66 (84). In the following description, the coordinate values indicate values with the center of the image area 2a as the origin.

Next, the gripping member 63 is manually moved so that the second identification mark P2 is set in the image area 2a of the X-ray camera 2 (see FIG. 11) (85). The position data L2 of the linear scale 62 at this time is also stored in the storage circuit 66 (86). Here, the second identification mark P2 is captured by the X-ray camera 2, and the captured image is subjected to image processing by the image processing device 65 to detect the center position of the second identification mark P2 (87). The center coordinates (X2, Y2) of the second identification mark P2 are stored in the storage circuit 66 (88).

Next, from the position data of the first and second identification marks, that is, the center coordinates (X1, Y1) of P1 and the center coordinates (X2, Y2) of P2, and the position data L1, L2 of the linear scale 62. The obtained distance B between the center coordinates of the two identification marks is compared with the distance A between the desired holes stored in the storage circuit 66 in advance, and an error (BA) between the two is calculated (89). . This calculation will be described in detail. First, in FIG. 13, the inclination angle θ of the printed circuit board 4 with respect to the linear scale 62 is obtained by the following equation.

[0031]

(Equation 1)

The distance B between the center coordinates of the identification mark is
Is obtained by the following equation.

[0033]

(Equation 2)

In this embodiment, the positions of the drilling positions are determined by correcting the positions of the first and second identification marks by a value obtained by dividing the error between both B and A into two equal parts. This is performed by obtaining P1 'and P2'. That is, the distribution amount Δ is Δ = (BA) / 2. This is the first and second correction values.

From the Δ and θ obtained by the above equation and the center coordinates of the identification marks P 1 and P 2, the drilling position is obtained by the following equation. That is, the coordinates (X
2 ′, Y2 ′) is calculated by X2 ′ = X2-Δcosθ Y2 ′ = Y2-Δsinθ (90).

When the second drilling position is determined, a signal is output from the central processing unit 64 to the drive motor of the XY table device 22, and the drilling means 3 determines the drilling position P.
Move to 2 '. Here piercing means 3 by a signal output from the CPU64 is drilled is performed in the second drilling position by lifting, the second hole H2 is being drilled (91).

Next, the gripping member 63 is manually moved, and the printed circuit board 4 is moved again so that the first identification mark P1 enters the image processing area 2a of the X-ray camera 2 (9).
2). This position may be slightly different from the position at the time of the first substrate setting (81), but is set near the position. The position of the gripping member 63 at this time is read by the linear scale 62, and the position data L3 is stored in the storage circuit 66 (93). The first drilling position is determined by performing an arithmetic operation on the basis of these data by the arithmetic circuit 67 (94). At this point, there is no need to image the first identification mark.

The center position of the identification mark at this position is represented by (X
3, Y3), the coordinates (X3 ', Y3') of the first drilling position P3 'are: X3' = X3 + Δcos θ = X1- (L1-L3) + Δ
cosθ Y3 ′ = Y3 + Δsinθ = Y1 + Δsinθ In this calculation, the gripping member 63 is translated in the X-axis direction along the linear guide 62, and X3 = X1-
This is based on the fact that the relationship of (L1-L3), Y3 = Y1 holds. Note that P1 ′ (X1 ′,
Y1 ') and P3 (X3, Y3) can be perforated at the distribution position without being obtained.

Then, the XY table mechanism 22 is operated again, and the first hole H1 is opened by the drilling means 3 at the first drilling position P3 '(X3', Y3 ') positioned on the printed circuit board 4. Dawn (95). In this manner, holes H1 and H2 are formed in the printed circuit board 4 at positions where the two marks are distributed by Δ with respect to both the identification marks, as shown in FIG.

In the present embodiment, the printed circuit board to be punched is a multilayer board, and an X-ray camera is employed as an image pickup means in order to image the positioning marks not exposed on the surface. , If it is only to make a hole in the printed board where the positioning mark is exposed,
A normal TV camera may be used. In the case of using a normal TV camera, an expensive X-ray generator and danger prevention measures are not required, which is advantageous in terms of cost.

Although a drill is used as the drilling means, it can be replaced with another means such as a punch.
Although the moving direction of the gripping member is set only in the X direction, if it can be moved in the XY directions, not only two points but also three points can be positioned.

In this embodiment, the first correction value and the second correction value are made equal, and the holes are divided so as to divide the error between the two identification marks into two equal parts. If the weight of one of the marks is greater than that of the other, for example, the first correction value may be set to 0, and the second correction value may be set to 2Δ, or vice versa. As described above, the method of determining the first and second correction values by allocating the error is not limited to the method of dividing into two, and various methods are possible.

XY table mechanism 22 used in the present invention
Is a small one for moving the drilling means 3 in a very fine range in the image area 2a, and is a large one which is conventionally used and moves the drilling means from one end of the printed circuit board to the other. The cost is much lower than that of the XY table mechanism.

[0044]

According to the present invention, in a printed circuit board drilling apparatus provided with only one punching unit having a punching means and a positioning means, a low-cost movement can be performed without using a large XY table. By using the amount detecting means, it is possible to easily make a hole at an accurate position, thereby contributing to cost reduction of a printed circuit board.

Further, the position of the identification mark and the position data of the detected gripping member are stored in a storage circuit, and the error between the predetermined desired drilling position and the drilling position calculated by the arithmetic circuit is sorted. Since the hole is drilled at the right position, the hole can be drilled at an accurate position on the printed circuit board, and the quality of the printed circuit board can be improved.

According to the present invention, since it is possible to make a hole at an accurate distribution position with only one means for making holes, it is necessary to use an expensive NC apparatus or a large XY table as in the prior art, or to provide a plurality of expensive X-ray cameras. Since there is no such device, it is possible to reduce the manufacturing cost of the punching device for a printed circuit board.

[Brief description of the drawings]

FIG. 1 is a system block diagram of a drilling device according to the present invention.

FIG. 2 is a right side sectional view showing a main part of the configuration of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional plan view taken along a line BB in FIG. 3;

FIG. 5 is a plan view of the moving means.

FIG. 6 is a left side view of the moving means.

FIG. 7 is a sectional view taken along the line CC in FIG. 5;

FIG. 8 is a plan view showing a state where a printed board is placed on a work table by a gripping member.

FIG. 9 is a flowchart illustrating a drilling method according to the present invention.

FIG. 10 is a plan view showing a state where a first identification mark is positioned in an image area of an imaging unit.

FIG. 11 is a plan view showing a state in which a second identification mark has been drilled by being positioned in an image area of the imaging means.

FIG. 12 is a plan view showing a state in which the first drilling position is located in the image area of the imaging means and then drilling is performed after the second drilling position is drilled.

FIG. 13 is an explanatory diagram showing a positional relationship serving as a basis for a calculation for determining a drilling position.

FIG. 14 is a plan view showing a state where holes are drilled at positions allocated to the identification marks on the printed circuit board.

[Explanation of symbols]

Reference Signs List 1 work table 2 imaging means (X-ray camera) 2a image area 3 drilling means 4 printed circuit board 62 movement amount detection means (linear scale) 63 gripping member 64 central processing unit 65 image processing unit 66 storage circuit 67 arithmetic circuit P1, P2 , P3 Identification marks P1 ', P2', P3 'Drilling positions L1, L2, L3 Position data output from movement amount detecting means

Continuation of the front page (51) Int.Cl. ⁷ identification code FI H05K 3/00 H05K 3/00 K (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 17/24 B23B 41/00 B23B 49 / 00 B26D 5/30 B26F 1/16 H05K 3/00

Claims (3)

(57) [Claims] 1. A printed circuit board on which at least one pair of identification marks is formed is gripped by a gripping member that moves in a direction in which the pair of identification marks are arranged, and the first identification mark of the printed board is formed by the first identification mark. It is set so as to be within the image area of the imaging means provided on the moving means which can move independently of the gripping member. The first identification mark is imaged by the imaging means, and is linked with the gripping member. Detecting the position of the first identification mark based on the position data of the gripping member obtained by the moving amount detecting means and the image processing result of the image obtained by the imaging means; The printed board is moved by moving a member, and the second identification mark is set so as to be within the image area of the imaging means. The imaging means sets the second identification mark. Detecting the position of the second identification mark based on the position data of the gripping member obtained by the movement amount detecting means and the image processing result of the image obtained by the imaging means; In order to correct the position of the first identification mark by comparing the position data of the first and second identification marks with the position data of a desired hole stored in the storage circuit in advance and allocating an error. And a second correction value for correcting the position of the second identification mark are set, and a second drilling position is calculated based on the second correction value. the mobile hand drilling means that is installed in the moving means
It is moved by stage, by the piercing means and drilling into the second drilling position, by moving the printed circuit board by moving the gripping member, the first identification mark said imaging means The first identification is performed based on the position data of the gripping member obtained by the movement amount detecting means and the position data of the first and second identification marks. Position of the first mark
Only the correction value to calculate the corrected first drilling position, by moving the drilling means by said moving means, said
A method for drilling a printed circuit board, comprising drilling at the first drilling position by a drilling means . 2. The method according to claim 1, wherein the first and second correction values are halves of the error. 3. A work table on which a printed circuit board provided with at least one pair of identification marks is mounted, a gripping member for moving the printed circuit board in a direction in which the pair of identification marks are arranged, and An image pickup device for picking up an image of a mark; an image processing device for processing an image obtained by the image pickup device; a central processing device to which data is input from the image processing device; The work table includes only one drilling means for drilling, and moving means for moving the imaging means and the drilling means independently of the gripping member. The work table stores the position data of the gripping member in the center. A movement amount detection means for outputting to the processing device; and the central processing unit includes a data output from the movement amount detection means and the image processing device. A storage circuit for storing, then the positional data and from the said image processing result of the mark for the both identification from the moving amount detecting means,
A printed circuit board connected to an arithmetic circuit for calculating a drilling position in which the position error of the identification mark is corrected based on desired hole position data stored in the storage circuit in advance. Drilling device.