JPS618607A - Detecting method of reference position of multilayered printed wiring board - Google Patents

Abstract

PURPOSE:To realize an easy method which facilitates automatic detection and automatic work by forming a grating mark of plural lines with different line width at one corner of an internal layer material circuit pattern flank, and boring a spot facing hole and then detecting a reference position through a photosensor. CONSTITUTION:The grating type mark C is formed at a corner part of the surface of an internal layer material 1 where a circuit pattern B is formed. The mark C is formed of couples of lines with different line width at four upper and lower, and right and left sides of a center intersection, and the line width increases successively outward. An XY table 8 and a photodetector 9 and a projector 9a which are arranged above and below the table are provided as a detecting device, and the detection output of the photodetector 9 is inputted to and processed by a signal processing circuit 10, arithmetic processing circuit 12, control processing circuit 13, etc. In this constitution, the mark-C corresponding part of the corner part of the external layer material of the wiring board on the table 8 is bored until the copper plate on the reverse surface is peeled off. The photosensor generates a photodetection signal based upon the line width of the mark C facing the hole. The circuit 10 decides on the line width and the array state in the XY direction and decides on the center point of the mark C from previously stored data, and the circuit 13 moves the table 8 to perform up to boring work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a reference position detection method for a multilayer printed wiring board.

[Background technology]

For example, in the case of a four-layer multilayer printed wiring board A as shown in FIG. 4, there is an inner layer material (1), upper and lower outer layer materials (2a),
(2b). In other words, the inner layer material fi+ uses an insulator (3) such as paper phenol or crow eboshi as a base material, and this insulator (
It is formed by adhering copper foil (4) to the upper and lower surfaces of 3), and before laminating the outer layer materials (2a) and (2b), a circuit pattern is formed in advance by etching with equal pressure. The outer layer materials (2a) and (2b) are insulators (6) in a pre-registered state.
are laminated on the upper and lower surfaces of the inner layer material (1), and copper foil (
6) is laminated on the surface of each insulator (6),
By heating and pressure forming, it becomes integrated with the inner layer material (11).By the way, when forming a circuit pattern using the copper foil (6) of the outer layer materials (2a) and (2b), the circuit spacing is similar to that of the paper phenol base material. 10.25-s, and 0.25-s for glass evo+shi base material.
15, so if the positional relationship with the circuit pattern on the inner layer material ftl side is not accurate, when through holes are drilled later, the circuit pattern on the outer layer material (2a), (2b) side and the inner layer material +1+ side There is a problem that circuit formation cannot be performed due to the positional shift of the circuit pattern.

Therefore, in the past, a kite mark (7) in the shape of a cross in a circle was placed around the surface of the inner layer material fil, as shown in Figure 5, using copper foil (
4), and after completing the multilayer printed wiring board A, use a drill with a flat tip to counterbore the position of the guide mark (7) to the closest point to the guide mark (7). Drill a hole and remove the outer layer material (2a).

(2b) Make sure that this guide mark (7) is visible from the outside.
) was used as a reference point when forming a circuit pattern using the copper foil (81) of the outer layer materials (2a) and (2b).

However, conventional counterbore hole machining relies on human intuition, making it impossible to automate the counterbore hole drilling process. Therefore, in order to make it easier to find the position of the guide mark (7) without relying on human intuition, a thin film-like material such as lint tape is pasted on the surface of the guide mark (7), and the outer layer material ( 2a), (2b) A method has been proposed in which the copper foil (6) on the surface protrudes by the thickness of the film-like object so that the gloss of that part is different from that of the surrounding area. , they have the disadvantage of being quite difficult to detect and not easy to automate.

[Purpose of the invention]

The present invention has been made in view of these drawbacks, and its purpose is to easily detect the reference position of the circuit pattern of the inner layer material, and to facilitate automatic detection and automatic processing of the reference position. The present invention provides a method for detecting a reference position of a multilayer printed wiring board.

[Disclosure of the invention]

Embodiment FIG. 1 shows the main part of the inner layer material (4) for the multilayer printed wiring board used in the present invention, in which a grid mark C is formed on the uneven part of the surface on which the circuit pattern B is formed. The center position of this mark C and the center position of the true kite mark D are on the same straight line parallel to the side edge of the inner layer material tll, and the distance a between the centers and the center position of mark C are If you know this, you can determine the reference position of the kite mark D, that is, the circuit pattern B.The mark C is located between the upper and lower center lines Oy of the mark C, and the left and right center lines, as shown in Figure 2. The intersection with OX is the center of mark C, and the pair of lines 1s Y s 7?s Y1bY are symmetrical with the center line oy as the border.
+ b Vlls Y r Is Y and center line O
Pair of lines symmetrical with respect to x 11xH11xs /IXI
/! XN IRX and 18X are arranged at 1 mJ+ intervals and crossed to form a grid-like mark. and line 1
+Y and l, X5lzY and Is x s Is Y and J, make the line width of X equal, and lsY and 11
The line width is gradually increased in the order of Y, l, x11s, l, and x.

FIG. 3 shows an overall schematic diagram of the WI5 configuration of an embodiment of the present invention. In the figure, (8) is an X-Y table, and above this X-Y table (8) is a light-transmissive bar food reader. A light projector (9) of the type shown above is arranged. The detection output of the projector (9) is subjected to line width detection and positional relationship determination processing by a signal processing circuit (I0).

A projector (9a) opposite to the projector (9) is arranged below the X-Y table (8). The signal processing circuit (lO) determines the center position of the mark C by detecting the line width and determining the positional relationship of each line, and provides the coordinate data to the arithmetic processing circuit (12). The arithmetic processing circuit 02) calculates the center coordinates of the guide mark D on the X-Y table (8) based on the coordinate data and the distance K from the center position of the mark C to the center of the guide mark D, which has been input and stored in advance. Calculate the data and convert the data to
Control circuit 0 for Y table (8) and drill device (I4)
It is designed to be given to 3i.

First, in the corner of the multilayer printed circuit board A placed on the X-Y table (8), that is, in the position corresponding to the mark C of the inner layer material fl), a long hole of about 7 to FEwφ is formed. Counterbore holes are bored to the extent that the copper foils on the upper and lower surfaces of the outer layer materials (2a) and (2b) can be peeled off. Therefore, some of the lines marked C will be exposed to the counterbore through the insulating material. Next, place the floodlight (9a) below the counterbore hole on the bottom side.
while moving the receiver (
9), and move the emitter (9a) and receiver (9) to
- When moved slightly in the Y direction, the light emitted from the projector (9a) is transmitted to the receiver (9) through a transparent or thin insulating material (5) such as a counterbore and glass ejector. Mark C facing the counterbore hole due to the above-mentioned movement of the received light
A light reception signal corresponding to the width of the line is taken into the signal processing circuit (10). The signal processing circuit (10) determines the width of the lines and how they are arranged in the X-Y direction based on the received light signal, and determines whether there is a center point of the mark C with respect to the counterbore hole based on the pattern data of the mark C stored in advance. Determine. The signal processing circuit (+01 i
;Primary arithmetic processing circuit 02) Give K. Arithmetic processing circuit (
1″4 is the distance a from the origin coordinates to the center of the guide mark D stored in advance.
The coordinate point data corresponding to the center of is transferred to the control processing circuit 0.

The control processing circuit a drives a pulse (not shown) based on the data from the arithmetic processing circuit (+2) to locate a predetermined coordinate point corresponding to the data on the XY table (8). The movement of the X/Y table (8) is controlled so that it is located just below the drill blade (+41) located above the XY tool (8).Then, when the movement is completed, the drill device θ → is moved downward by the control processing circuit (13) to punch a counterbore hole in the multilayer lint wiring board A on the X-Y table (8).

When this counterbore hole drilling is completed, the drill device 04) is returned to the upper position, and if there are multiple guide marks (7), the coordinate point corresponding to the next guide mark (7) is set to the drill device (04). 14) The control processing circuit (O) controls the movement of the X/Y table (8) based on data from the arithmetic processing circuit (H) so that it is positioned below.

It is of course possible to drill the hole by finding the coordinate position of the reference point instead of drilling the counterbore hole corresponding to the guide mark D.

〔Effect of the invention〕

In the present invention, a circuit pattern is formed in advance using metal foil on the surface of an insulator through which light can pass, and another insulator through which light can pass is laminated on the surface of the insulator on the side surface of the circuit pattern of an inner layer material. In a multilayer printed wiring board formed by laminating a thin metal foil and a loose outer layer material, at the corner of the circuit pattern of the inner layer material, pairs of wires located symmetrically from the center vertically and horizontally are of the same width and at least A grid-like mark with a width different from that of other pairs of lines located in the same direction is provided, and the metal foil on the upper and lower surfaces of the multilayer printed wiring board corresponding to the position of the mark is peeled off from the upper and lower surfaces of the multilayer printed wiring board. A transmission-type optical sensor with a counterbore hole large enough to allow multiple lines to face each other and a transmitter/receiver placed facing each other through the upper and lower counterbore holes is used to determine the arrangement pattern of each line of the mark facing the counterbore hole. The center of the mark is determined by determining the center of the mark, and the reference position of the circuit pattern on the inner layer material at a predetermined distance from this center position is detected. Differently, the circuit pattern reference position can be reliably detected, and the drilling work can be automated by combining X-Y teeth, etc., and productivity can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a top view of the main parts of the inner layer material of the multilayer printed wiring board used in the present invention, Figure 2 is the copper foil used in the same, (9) is the light receiver, (9a) is the emitter, and the Aid multilayer printed wiring. Board, C is mark, 11X + it Y z It x,
12Y... This is the horizontal line.

Claims (1)

[Claims] (1) A circuit pattern is formed in advance using metal foil on the surface of an insulator that allows light to pass through. On the side surface of the circuit pattern of the inner layer material, another insulator that allows light to pass through is laminated on the surface of the insulator. In a multilayer printed wiring board formed by laminating an outer layer material made of metal foil, the corner of the circuit pattern of the inner layer material is
A multilayer print that corresponds to the position of the mark by providing a lattice-like mark in which pairs of lines located symmetrically from the center up and down and left and right have the same width and at least a width different from other pairs of lines located in the same direction. Drill a counterbore hole large enough to peel off the metal foil on the upper and lower sides of the wiring board and to expose the multiple lines of the mark, and place the emitter and receiver facing each other through the upper and lower counterbore holes. The center of the mark is determined by determining the arrangement pattern of each line of the mark facing the counterbore using a transmissive optical sensor, and the reference position of the circuit pattern of the inner layer material is detected at a predetermined distance from this center position. A reference position detection method for a multilayer printed wiring board, characterized by: