JPH0138606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for measuring the distance between a drill and an eddy current position sensor of a printed circuit board hole processing device.

(b) Conventional technology When drilling a reference hole on a printed circuit board to serve as a reference for positioning, a copper mark is provided on the printed circuit board in advance, and this copper mark is detected by a position detector such as an optical sensor. A known method is to then move the drill to this position and drill the reference hole. The position detector and the drill are installed parallel to the drill head at a predetermined distance.
After the position detector detects the center position of the copper mark, the drill head is moved by the distance between the two, thereby drilling a hole at the copper mark position.

(c) Problems to be solved by the invention The dimension between the drill and the position detector is supposed to be set to a predetermined value for each drill head, but
When replacing the drill and the position detector, the mounting condition changes slightly, so the dimensions between the two change, albeit minutely. Furthermore, the mounting angle of the position detector also varies slightly. For this reason, the positional accuracy of the reference hole was reduced. In order to prevent this, it is necessary to use a length measuring device to measure the dimension between the two each time replacement work is performed, but this measurement work is troublesome and also poses problems in terms of measurement accuracy.
The present invention aims to solve these problems.

(d) Means for solving the problem The present invention actually drills a hole using a drill, detects the hole position with an eddy current position sensor as a position detector, and detects the position of the drill head at that time. The above problem is solved by calculating the distance between the drill and the eddy current position sensor from the amount of movement. That is, the first invention of the present application is to drill a hole in a non-metallic plate material attached to a processing location of a printed circuit board hole processing device, and read a signal corresponding to the position of the drill head at that time. A metal pin is fitted into a hole cut into a plate material and fixed.The drill head is moved and an eddy current position sensor detects the center position of the pin. reading a signal corresponding to the position of the drill head at a given time; and calculating the travel distance of the drill head (i.e. the distance between the drill and the eddy current position sensor) from the two signals corresponding to the position of the drill head. It consists of each stage.

Further, the second invention of the present application is to drill a hole in a metal plate attached to a processing location of a printed circuit board hole processing device, and to read a signal corresponding to the position of the drill head at that time. moving the drill head to detect the center position of the hole with an eddy current position sensor and reading a signal corresponding to the position of the drill head when the eddy current position sensor is at the center position of the hole;
The method consists of the following steps: calculating the distance traveled by the drill head (i.e., the distance between the drill and the eddy current position sensor) from the two signals corresponding to the position of the drill head.

(E) Effect As mentioned above, first, a hole is drilled in the plate material, and the eddy current position sensor is moved to the hole position (i.e., the position of the pin fitted in the hole, or the position of the hole itself), By detecting the amount of movement, the dimension between the drill and the eddy current position sensor is measured. This measurement is very accurate as it corresponds to actual working conditions. That is,
When actually processing a printed circuit board, the center position of the copper mark is first detected and the drill is moved to that position, but with this measurement method,
First, a hole is machined and the eddy current position sensor is moved to the center of the hole. Therefore, the situation is the same as that during actual machining, except that the direction of movement of the drill head during measurement is reversed. If you have replaced the drill and/or the eddy current position sensor and there is a possibility that the dimensions between them have changed, you can simply perform this measurement to accurately align the drill to the center of the copper mark. It will be possible to match.

(f) Examples (first invention) Examples of the first invention will be described below with reference to Nos. 1 to 1 of the attached drawings.
This will be explained based on FIG.

2 and 3 show a printed circuit board hole machining apparatus to which the method of the present invention is applied. Drill head 1 equipped with an eddy current position sensor 10 and a drill 12
4 is attached to a table 18 movable in the X direction by a servo motor 16, and this table 18 is further mounted on a table 22 movable in the Y direction perpendicular to the X direction by a servo motor 20. It is being The operation of the servo motor 16 and the servo motor 20 is controlled by a controller 24, and the operation of the servo motor 16 and the servo motor 20 is controlled by a controller 24.
Signals corresponding to the rotational position of the drill head 14, that is, the coordinates of the drill head 14 in the X and Y directions, are detected by, for example, a pulse detector provided therein, and are input to the controller 24. A detection signal from the eddy current position sensor 10 is also input to the controller 24 .

The drilling of a reference hole in a printed circuit board using this hole processing device is performed as follows. First, the eddy current type position sensor 10 is attached to the printed circuit board 3 as shown in FIG.
0 approximately above the copper mark 32 (point A in FIG. 4), then operate the servo motor 16,
The eddy current position sensor 10 is reciprocated in the X direction as shown by the broken line in FIG. When moving to the right in FIG. 4 through point B, the output current detected by the eddy current position sensor 10 changes as shown in FIG. The point where the current rises to a predetermined value (i.e., this corresponds to point B)
The coordinate b indicated by the pulse signal from the servo motor 16 at is stored in the controller 24. Also, point C
The output current of the eddy current position sensor 10 when moving to the left in FIG. 4 through the eddy current position sensor 10 also changes as shown in FIG. 6, and the coordinate value c at point C is stored. The controller 24 performs the calculation x=(b+c)/2, and this x is the center position of the copper mark 32.
It will show the coordinates in the direction. Next, the servo motor 20 is activated, and the eddy current position sensor 10 is activated.
is reciprocated in the Y direction, and the center position of the copper mark 32 in the Y direction is calculated by the same operation as above. This means that the center position of the copper mark 32 has been detected. Next, the servo motor 16 and the servo motor 20 are operated to move the drill 12 to this center position. That is, from the state where the eddy current position sensor 10 is aligned with the center position of the detected copper mark 32, the servo motor 16 is operated to move the drill head 14 by the distance l between the eddy current position sensor 10 and the drill 12. The state will be as follows. Thereby, the drill 12 is aligned with the center position of the copper mark 32. Next, drill 12
is lowered and the reference hole is machined. As a result, a reference hole is accurately formed in the center of the copper mark 32.

Next, the drill 12 and the eddy current position sensor 10
The method for measuring the distance between the two will be explained.

When the attachment state of the drill 12 or the eddy current type position sensor 10 to the drill head 14 is changed, the dimensions between the two are measured as follows. First, a plate material 40 made of non-metallic material such as epoxy resin or Bakelite is fixed at a processing location below the drill head 14. Next, as shown in FIG. 1a, a hole 41 is formed in the plate material 40 using the drill 12. A signal indicating the rotational position of the servo motor 16 and the servo motor 20 at that time (that is, a signal corresponding to the coordinates of the drill head 14 in the X direction and the Y direction) is stored in the controller 24. Then,
A cylindrical metal pin 42 is fitted into a hole 41 formed in the plate material 40, as shown in FIG. 1b. Next, the servo motor 16 is operated to move the drill head 14 in the X direction as shown in FIG.
The center position of the pin 42 is detected by the eddy current position sensor 10. This detection operation is performed in the same manner as the method for detecting the copper mark 32 described above. A signal indicating the rotational position of the servo motor 16 and the servo motor 20 corresponding to the detected center position of the pin 42 (i.e., the position of the drill head 14 when the eddy current position sensor 10 is at the center position of the pin 42).
(signals corresponding to the X- and Y-direction coordinates) are stored in the controller 24. Next, drill head 1
The moving distance of the drill head 14 is calculated from the above two signals corresponding to the position No. 4. This moving distance corresponds to the distance between the eddy current position sensor 10 and the drill 12. Therefore, when drilling a reference hole in the printed circuit board 30, the center position of the copper mark 32 is detected by the eddy current position sensor 10, and then the eddy current position sensor 10 calculated as described above is used. By moving the drill head 14 by the distance between the copper mark 32 and the drill head 12, the drill head 12 will be located exactly at the center of the copper mark 32. The dimensions between the eddy current position sensor 10 and the drill 12 are measured while they are attached to the drill head 14 and during actual machining, so the drill 12 can be positioned at the center of the copper mark 32 with great precision. Can be set. Furthermore, even if the eddy current position sensor 10 is somewhat inclined, or the characteristics of the eddy current position sensor 10 are not completely symmetrical with respect to the center position of the eddy current position sensor 10, Since measurements are made including these errors, these effects can be removed.

(Embodiment of the second invention) In the embodiment of the first invention described above, the non-metallic plate material 40 is used, but a metal plate material may also be used. That is, as shown in FIG. 7a, a metal plate 50 is fixed at a processing position below the drill head 14, and a hole 51 is formed with the drill 12. Next, the drill head 14 is moved and the seventh
As shown in FIG. b, the center position of the hole 51 is detected by the eddy current type position sensor 10. In this case, the current characteristic obtained by the eddy current type position sensor 10 has a polarity reversed compared to the case where the copper mark 32 is detected. The distance between the eddy current position sensor 10 and the drill 12 is determined by the distance that the drill head 14 has moved from the position of the drill head 14 when the hole 51 was first machined to the position where the eddy current position sensor 10 corresponds to the center position of the hole 51. As in the first invention, the dimensions of can be measured.

(g) Effects of the Invention As explained above, according to the present invention, the position of the drill head when drilling a hole in a plate material with a drill and the position of the drill head when the eddy current position sensor is at the center of the hole can be determined. Since the position of the eddy current type position sensor and the dimension between the drill and the position of the eddy current type position sensor are measured, the dimension between the eddy current type position sensor and the drill can be extremely accurate and correspond to the actual machining conditions. The positional accuracy of the reference hole can be improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the process of the first invention, Fig. 2 is a diagram showing a printed circuit board hole processing device, and Fig. 3 is a diagram showing the process of the first invention.
Figure 4 is a diagram showing the locus of the copper mark and the eddy current position sensor, Figures 5 and 6 are diagrams showing the output current characteristics of the eddy current position sensor, and Figure 7 is a diagram viewed in the direction of the arrow in the figure. The figure is a diagram showing the process of the second invention. 10... Eddy current position sensor, 12... Drill,
14... Drill head, 30... Printed circuit board, 32
...Copper mark, 40...Plate material, 42...Pin, 50...Plate material, 51...Hole.

Claims (1)

[Claims] 1. A drill and an eddy current position sensor are provided in parallel at intervals on a drill head, and the drill is positioned at the center of the copper mark on the printed circuit board detected by the eddy current position sensor. In a method for measuring the distance between a drill and an eddy current position sensor of a printed circuit board hole processing device configured to automatically drill a reference hole by moving a drill head at Drilling a hole in a non-metallic plate attached to the plate and reading a signal corresponding to the position of the drill head at that time; (b) Fitting a metal pin into the hole machined in the plate and fixing it. (c) moving the drill head to detect the center position of the pin by means of an eddy current position sensor, and reading a signal corresponding to the position of the drill head when the eddy current position sensor is at the center position of the pin; (d) calculating the travel distance of the drill head, that is, the distance between the drill and the eddy current position sensor from the two signals corresponding to the position of the drill head. A method for measuring the distance between a drill and an eddy current position sensor in a board hole processing device. 2. A drill and an eddy current position sensor are installed parallel to each other at intervals on the drill head, and the drill head is moved so that the drill is positioned at the center of the copper mark on the printed circuit board detected by the eddy current position sensor. In a method for measuring the distance between a drill and an eddy current position sensor of a printed circuit board hole processing device configured to automatically drill a reference hole, (a) a metal object attached to the processing location of the printed circuit board hole processing device; (b) move the drill head and detect the center position of the hole with an eddy current position sensor; (c) reading a signal corresponding to the position of the drill head when the position sensor is at the center position of the hole; (c) determining from the above two signals corresponding to the position of the drill head the distance traveled by the drill head, i.e., the drill and the eddy current position sensor; A method for measuring the distance between a drill and an eddy current position sensor of a printed circuit board hole machining device, the method comprising the following steps: calculating the distance between the drill and the eddy current position sensor.