JPS6239239A - Automatic spot facing device for laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for mounting a laminate, such as a copper-clad laminate for a multilayer printed wiring board, in which conductors and insulators are alternately formed into a plurality of layers from the surface to any desired layer. Concerning the automatic dusting device for Kurudama.

[Technical background of the invention and its problems] In the manufacturing process of a multilayer printed wiring board, for example, in the case of a four-layer multilayer printed wiring board, the steps shown in FIGS. 5(a) and (b)
As shown in FIG. 2, outer layer copper foils 1a and 1d and inner layer copper foils 1b and 1C formed in a pattern are respectively insulating base materials 2a and 1C.
The copper-clad laminate 3 laminated via the copper foils 2b and 2c is subjected to processing such as drilling, plating, and pattern formation on the outer copper foils 1a and ld. Processing such as drilling holes and forming patterns on the outer copper foil is done on the inner layer! ! It is necessary to accurately maintain the relative positional relationship with respect to the patterns i1b and 1C, and therefore, prior to these processes, processing reference holes are prepared in the copper clad laminate 3. There is.

Drilling of the processing reference hole is normally performed in two steps as shown below.

(b) As shown in Figures 6(a) and (b), place a machining kite in the vicinity of the machining reference mark position, which has been made in advance on the inner layer copper foil 1b using a counterbore cutter with a diameter slightly larger than the machining reference hole. Counterbore until semi-mark 4 is exposed.

(b) Next, visually inspect the exposed machining reference mark 4 and drill a machining reference hole 5 through it as shown in FIGS. 7(a) and 7(b).

By the way, in this counterboring process, the cutter is
It is necessary to stop the cutter from descending when point b is reached, but since copper-clad laminates are generally obtained by hot press forming, the thickness varies and the counterbore depth is not constant. It is difficult to automate the vertical movement, and conventionally this counterboring work has been done visually by skilled workers, which has the disadvantage of low workability.

[Object of the Invention] The present invention was made in order to solve such conventional problems, and an object of the present invention is to provide an automatic counterboring device that can automatically perform counterboring work. .

[Summary of the Invention] In other words, the automatic underbore device of the present invention includes a counterbore cutter that is electrically divided in the circumferential direction by an insulator and is electrically connected by bringing its tip into contact with a conductor; A motor for rotating, a drive device for advancing and retracting the cutter for outer boring, a counter for counting the number of times the cutter for outer boring is electrically connected, and a preset setting value for the counter from 1 to 1. By providing a comparator for comparison and a control device for controlling the drive device based on the output of the comparator, the processing operation of the counterbore cutter can be automatically performed when the counterbore cutter descends to the target layer. This makes it possible to stop the vehicle automatically.

[Embodiments of the invention] Next, examples of the present invention will be described.

FIG. 1 is a diagram schematically showing an embodiment of an automatic drilling device of the present invention, and FIG. 2 is a perspective view showing a counterboring cutter used in this automatic drilling device.

Note that in FIGS. 1 to 4, the same parts as in FIGS. 5 to 7 are given the same reference numerals, and a description of assembling them will be omitted.

The automatic drilling device of this embodiment is a counterboring saw cutter 7.
, a drive unit that rotates, lowers and raises this counterbore cutter 7; a position detection unit S that detects the position of the counterbore cutter 7; and a position detection unit S that detects the position of the counterbore cutter 7; It is composed of a control section C that controls the lowering and raising operations of the boring cutter 7.

For example, as shown in FIG.
It has a flat tip structure that is joined via C.

Further, as shown in FIG. 3, after cutting the copper foil 1a on the surface, the side surface of the counterbore cutter 7 and the copper foil 1a come into contact, so that the electrically divided parts 7a and 7b are not electrically connected. A spray coating 71 made of electrically insulating ceramic is formed on the outer periphery.

This counterbore cutter 7 is held by a jack 9 via an insulator 8 and fixed to the lower end of a spindle 10. A belt pulley 11 is fixed to the upper end of the spindle 10, and the belt pulley 11 is connected via a transmission belt 12 to a belt pulley 14 that is pivotally attached to a spindle drive motor 13. By rotating the counterbore cutter 7, the counterbore cutter 7 is rotated. The spindle 10 also has a cylindrical rack 15.
is loosely fitted in a state where relative movement in the vertical direction is restricted. This rack 15 is engaged with a small gear 17 that is pivoted on a motor 16 that can rotate forward and backward, and by driving the motor 16, the spindle 10 is moved up and down.

In addition, the insulating layer 7C of the counterbore cutter 7 electrically
Contact electrodes 18a and 18b exposed from the inner surface of the insulator 8 of the chaff 9 are in contact with the divided portions 7a and 7b, and these contact electrodes 18a and 118
b is connected to slip rings 20a and 20b fitted to the spindle 10 by lead wires 19a and 19b. And these slip rings 20a, 20b
Brush contacts 21a and 21b are in sliding contact with each other, and a predetermined voltage is applied to one of these brush contacts from a power supply (not shown). Also, brush contact! -218, the other of 21b is connected to the integrating circuit 22,
A counter circuit 24 passes through a Schmitt circuit 23 and counts the number of times the electrically divided parts 7a and 7b of the counterbore cutter 7 are short-circuited.

The output end of the counter circuit 24 is connected to one input end of the matching circuit 25, and the output end of the layered window switch 26 is connected to the other input end of the matching circuit 25. A coincidence signal is output to the control circuit 27 when the set number of layers and the output of the counter circuit 24 match.

The control circuit 27 is configured to rotate the motor 16 in the forward and reverse directions via the motor forward/reverse drive circuit 29 by pressing the start switch 28, thereby raising and lowering the spindle 10. Furthermore, when a coincidence signal is input from the coincidence circuit 25 while the motor 16 is in the normal rotation state (downward), the motor 16 is reversed (upward), and the lower edge h of the rack 15 (the limit switch 30 for detecting the stationary position is contacted and a stop signal is detected). The motor 16 is configured to stop when a number is input.

Next, using this device, the outer layer copper foil 1 as shown in FIG.
Fig. 1 shows how to seat the copper-clad laminate 3, in which the inner layer copper box 1b with patterns a and 1d and the IC are laminated via the insulating base materials 2a, 2b, and 2C, up to the inner layer copper foil 1b. This will be explained using FIG. In FIG. 1, the counterbore cutter 7 is in a non-contact state with the copper-clad laminate 3 when the stationary position detection switch 30 is in the on position, and the counter circuit 24 is in a zero-reset state. .

First, the spindle rotation drive motor 13 is operated to rotate the spindle 10 and the counterbore cutter 7. Also, the number of conductor layers for the purpose of layered window switch 26 (in this case 2)
Set to . Next, when the start switch 28 is pressed, the control circuit 27 sends a forward rotation drive signal to the motor forward/reverse drive circuit 29, and the motor 16 is activated by the motor drive signal @S2 from the motor forward/reverse drive circuit 29. It rotates in the normal direction, and the spindle 10 and the counterbore cutter 7 fixed thereto descend. When the counterbore cutter 7 contacts the outer copper foil 1a of the copper-clad laminate 3, conduction occurs between the electrically divided parts 7a and 7b of the cutter 7, and this conduction signal $3 is chattered by the integrating circuit 22. After the ring is absorbed, the waveform is shaped by the Schmitt circuit 23 (signal 34) and counted as 1 by the counter circuit 24 (
signal Ss). At this stage, since the number does not match the number set by the layered window switch 26, no match signal is output from the match circuit. The counterbore cutter 7 continues to descend further, cuts the outer layer copper foil 1a, and when it reaches the next insulating substrate 2a, the electrically divided parts 7a and 7b of the counterbore cutter 7 are no longer electrically conductive, and the counter Input signal S4 to circuit 24
However, the counterbore cutter 7 continues to descend. Next, when the counterbore cutter 7 reaches the copper foil 1b, the electrically divided parts 7a and 7b of the counterbore cutter 7 become conductive again, and the counter circuit 24 counts again and sends a signal corresponding to 2 ( A signal Ss) is output.

When the output S5 of the counter circuit 24 becomes 2, it coincides with the output S6 of the layered window switch 26 of 2, so that the coincidence circuit 25 outputs a coincidence signal S7. The control circuit 27 receives this coincidence signal S7, stops the forward rotation drive signal of the motor forward/reverse drive circuit 29, and sends out the reverse rotation drive signal. As a result, the motor 16 rotates in reverse, and the spindle 10 and the counterbore cutter 7 begin to rise. Thereafter, the spindle 10 continues to rise until the limit switch 30 for detecting the stationary position is turned on, and this limit switch 30 for detecting the stationary position
When S++ is turned on, the drive signal to the motor forward/reverse drive circuit is stopped, and the counter of the counter circuit 24 is reset to zero by the signal S9, and the spot boring operation is completed.

Note that the integrating circuit 22 and the Schmitt circuit 23 are for absorbing chatter due to unstable contact when the counterbore cutter 7 contacts the conductive layer, and may be replaced by other means.

Furthermore, if the counter circuit 24 is configured to count up not at the front end of the input signal but at the end (when conduction ends), it is possible to count up the input signal up to the final conductive layer.

[Effects of the Invention] As explained above, according to the apparatus of the present invention, gI laminates such as copper-clad laminates for multilayer printed wiring boards can be automatically and easily laid down to arbitrary layers.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an embodiment of the device of the present invention, and FIG.
The figure is a perspective view of the counterbore cutter, FIG. 3 is a partial sectional view of the counterbore cutter, FIG. 4 is a signal timing chart of the device of the present invention, and FIGS. 5(a), (b) to 7< a
) and (b) are a perspective view and a sectional view, but do not show the step of drilling a processing reference hole in a copper-clad laminate. 1a, 1d... Outer layer copper foil 1b, 1C... Inner layer copper foil 2a, 2b, 2G - Insulating base material 3...・Copper-clad laminate 4...
・・・・・・・・・・・・Processing standard mark 5・・・・・・
・・・・・・・・・Machining reference hole 7・・・・・・・・・
・・・・・・Counterbore cutter 9・・・・・・・・・・・・
・・・・・・Chuck 10・・・・・・・・・・・・・・・
・Spindle 15......Rack 16...Motor 18a,
1811... Contact electrodes 20a, 2Qb...
...Slip ring 21a, 21b...Brush contact 22...Integrator circuit 23...Schmidt Circuit 24・・・・・・・・・・・・Counter circuit 25・・・・・・・・・・・・・Number circuit 26・・
・・・・・・・・・・・・Layer installation switch 27...
・・・・・・・・・・・・Control circuit 28...
・・・・・・・・・・・・Star 1~Switch 29・
......Motor forward/reverse drive circuit 30
・・・・・・・・・・・・Stationary device detection switch Applicant: Toshiba Chemical Co., Ltd. Representative Patent Attorney Satoshi Suyama - Figure 7 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] (1) A counterbore cutter that is electrically divided in the circumferential direction by an insulator and is electrically connected by contacting the tip with a conductor, a motor that rotates the counterbore cutter, and a motor that moves the counterbore cutter back and forth. a counter that counts the number of times the spot facing cutter is turned on; a comparator that compares the count value of this counter with a preset setting value; An automatic counterboring device for laminated plates, characterized in that it is equipped with a control device for controlling.