JPH06207963A - Production of test data for printed board - Google Patents

Abstract

PURPOSE:To produce test data for printed board mounting electronic components effectively while avoiding interference between robots in a system where a facility performing electric tests, i.e., conduction test and short circuit test, is operated using a plurality of robots and probes. CONSTITUTION:Nest list information of a printed board is split with each net unit and a reference point is extracted from each net (step #2), test information providing pair information for the reference point and other point is formed in each net(step #2), a test probe is assigned according to a relationship of coordinate values(step #4), thus producing a board test data. Furthermore, in order to deal with two-sided board, the data is converted to allow simultaneous movement of a plurality of probes(step #5-#11).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method for creating inspection data used in a short circuit inspection device.

[0002]

2. Description of the Related Art An example of a conventional method for creating inspection data used in a printed circuit board inspection facility for inspecting continuity and short circuit of a printed circuit board by a plurality of XY robots and probes attached to each robot will be described with reference to the drawings. To do.

FIG. 9 is a flow chart showing a conventional procedure for creating inspection data. First of all, the operator extracts the continuity and short circuit information on the board from the board design information (step #
30), the coordinate values are acquired by the teaching work for each point by obtaining from the operation range of each robot so as to avoid interference, and the data for the printed circuit board inspection is created.

[0004]

However, in the method described above, in order to generate data to be inspected by moving the probes attached to each of a plurality of robots, a human being considers the avoidance of interference between the robots. However, there is a problem that a troublesome work such as creating data one point at a time occurs. There is also a problem that there is a large difference in the quality of inspection data created depending on the skill of the operator.

The present invention provides a method capable of effectively creating data of the same quality in consideration of interference avoidance by anyone using a computer for a time-consuming process of making judgments by a person. The purpose is to do.

[0006]

In order to achieve the above object, a method for creating board inspection data according to the present invention operates a continuity inspection apparatus for a printed board which mounts electronic components using a plurality of XY robots and probes. A method of creating inspection data, comprising: a first step of dividing the netlist information of the printed circuit board for each net, a second step of extracting a reference point in each net, and a reference step in each net. It consists of a third step of creating pair information of points and other points, and a fourth step of assigning which probe to inspect based on the relationship of coordinate values, and automatically creates data considering the interference avoidance of the XY robot. It has a plurality of probes on the front and back sides, and a procedure for converting the inspection data so that the probes can be moved simultaneously after the fourth step. A printed circuit board inspection data creation method and symptoms.

[0007]

According to the present invention, the inspection data (combination data of the reference point and other points) in each net is first created by the above-mentioned configuration, and then the probe to be used is determined from the coordinate value. It becomes possible to avoid probe interference, and it is possible to easily create data for conducting and short-circuiting inspection of one printed circuit board by combining it with the data of other nets. It is possible to check coordinate values one by one with the conventional manual operation. This eliminates the need for time-consuming work processes such as creating inspection data that avoids interference between robots, and makes it possible to create high-quality printed circuit continuity and short-circuit inspection data in a short time regardless of the skill level of the operator. It will be possible.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments, a board inspection machine that operates with board inspection data created by the board inspection data creation method of the present invention will be described. FIG. 6 is an external view of the board inspection machine. Reference numeral 17 is XY for moving the probe for inspecting the substrate surface
Robot, 18 is a substrate front surface probe contact unit, 19 is an XY robot that moves a probe for inspecting the back surface of the substrate, 20 is a substrate back surface probe contact unit,
Reference numeral 21 is a substrate holding portion. A probe is attached to the tip of the probe contact unit. After mounting the board on the board holding part, when the inspection start signal is sent from the computer that controls the equipment, each of the XY robots above and below moves the four probes attached to it simultaneously to contact the printed board and turn on the electricity. By flowing it, the board inspection for conduction and short circuit is executed. As shown in FIG. 7, the probe numbers appearing in the examples described below are 22 for probe 1, 23 for probe 2, 2
4 is defined as probe 3 and 25 is defined as probe 4.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing a series of procedures for creating continuity / short circuit inspection data for a double-sided board.
First, the CAD outputs a net list which is the connection information on the board (step # 1) and registers it in the computer.
In this netlist, each net name, board surface (front and back) on which inspection points exist, pin names, inspection point coordinate values (X, Y), and inspection method (continuity inspection, short-circuit inspection) are included. It is registered.

Inside the computer, the net list is divided into nets, and further, each surface is divided into a front surface point and a back surface point, and the continuity inspection point in each of them has the smallest X coordinate value (X If the coordinate values are the same, the one with the smaller Y coordinate value) is extracted as the reference point (step # 2). FIG. 2 is a specific example of extracting the reference points. 1 is a state after being divided in net units in the net list. In FIG. 2, the data is simplified and described, and only the net name, the substrate surface, the X coordinate, the Y coordinate of the measurement land, and the inspection category (conduction: 0, short circuit: S) are shown from the left. From the state of 1 in the point data for continuity inspection existing on the front surface (2), in the point data for continuity inspection existing on the back surface (3), in the point data for short circuit inspection existing on the front surface (4), back surface Within the point data for short circuit inspection existing in (5), ascending order is performed by the X coordinate value. 6 is a sorting result. In this data, the point for the continuity test existing on the front surface has the smallest X coordinate value (7), and the point for the continuity test existing on the back surface shows X.
The one with the smallest coordinate value (8) is extracted as the reference point.

Next, in each net, the extracted reference point and other points are combined to create information on the inspection location (step # 3). FIG. 3 is a flowchart of the inspection information creation. First, after reading one line of data (step # 12), it is compared whether it is the same as the net name of the previous line (step # 13). In the case of a new net name, the probe 1 is determined when the point is a front surface point, and the probe number is determined in the case of a back surface point, and the probe number is determined as a temporary reference point (steps # 14 to # 18). If the net name is the same, the probe number is decided depending on whether the point is on the front or back. Probe 2 if the reference point is the front side and the point of the current read line is the front side. Probe 3 if the reference point is the front side and the current read line is the back side. If the reference point is the back side and the current read line is the front side. When the probe 2, the reference point is the back surface and the current read line is the back surface, it is assigned to the probe 4 (steps # 19 to # 28). However, when the preceding line is the front side point and the current read line point is the back side point (there may be the reverse), the reference point data is updated to the back side (or front side). This process is intended to shorten the inspection operation time by making it possible to inspect four probes at the same time by forming pairs of points on the front surface or points on the back surface as much as possible. This process is repeated until the last line (step # 29),
Create inspection information by allocating points to each probe. Through this series of operations, the data is converted into data in which the interference avoidance of the continuity inspection unit is considered. The short circuit inspection section
The coordinate values assigned to the probe 1 and the probe 2 are compared, and the coordinate values of X1, Y1 and X2, Y2 are exchanged instead of X1> X2. By similarly performing the probe 3 and the probe 4, it is possible to avoid interference at all inspection points. The processing result by concrete data is shown in FIG. From the data (9) created in step # 2, the reference point on the front side is combined with the point on the other surface (10), and the reference point on the back side is combined with the point on the back side (11).
However, when the point for continuity inspection is connected from the front surface to the back surface (or from the back surface to the front surface) (when there is a through hole), the front surface reference point and the back surface reference point are combined (12). Information on the inspection location is created by this series of processing (13). The number after X or Y in FIG. 3 indicates the probe number. If the probe numbers are defined as shown in FIG. 6, each probe interferes unless the coordinate value of X1 ≦ the coordinate value of X2 and the coordinate value of X3 ≦ the coordinate value of X4. Only the uncombined data is replaced with the X1, Y1 coordinates and the X2, Y2 coordinates or with the X3, Y3 coordinates and the X4, Y4 coordinates (step # 4).

The data of the above state is classified into three patterns of a combination of front surface points and front surface points, a combination of rear surface points and rear surface points, and a combination of front surface points and rear surface points (step # 5). Data that is a combination of points on the front surface and points on the front surface and data that is a combination of points on the back surface and points on the back surface can be inspected by operating four probes at the same time. (4 measurement points) Convert inspection data that can be inspected (step # 6).

Next, regarding the combination of the points on the front side and the points on the back side, the points on the front side are sorted in ascending order of X coordinate values (where the X coordinate values are the same, ascending order of Y coordinate values), and the median value is extracted ( In step # 7), the probes are distributed to different probes (step # 8). The same process is performed for the points on the back side (step # 9). FIG. 4 shows the contents of steps # 7 to # 9 in FIG. 14 is data before distribution, 15 is an example at the time of extracting the median value on each of the front surface and the back surface, and 16 is data after distribution.

With respect to the data generated by the processing up to step # 9, the combination of probe 1 and probe 3 and the combination of probe 2 and probe 4 can simultaneously operate the probes. Two
Converts to the inspection data to be inspected (4 measurement points). Similarly, the combination of probe 1 and probe 4 and the combination of probe 2 and probe 3 are simultaneously converted into inspectable data (step # 10). Step here #
6. Combine the data created in step # 10 to create board inspection data (step # 11). This completes the creation of the inspection data for inspecting the double-sided board. Figure 8
Shows the locus of the coordinate points of the created board inspection data. The numbers in the figure indicate the order of movement.

[0015]

As described above, according to the present invention, the netlist information is received from the CAD, and the probe is automatically allocated in the computer from the relation of the coordinate values of the inspection points.
By providing a program to avoid interference of each robot, data is acquired point by point by teaching, eliminating the time-consuming and error-prone process of human beings creating inspection data in consideration of robot interference avoidance. It is possible for the data creator to create the board inspection data with no difference in quality in a short time.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of a printed circuit board inspection data creating method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a method of extracting reference points in each net, which is performed in this embodiment.

FIG. 3 is a flowchart of a probe allocation method.

FIG. 4 is an explanatory diagram explaining the contents of creating inspection information from reference points and other points, which is performed in this embodiment.

FIG. 5 is an explanatory diagram explaining the conversion contents of the inspection data of the conductive portion connected from the front surface to the back surface, which is performed in this embodiment.

FIG. 6 is a schematic perspective view of a substrate inspection machine used in this embodiment.

FIG. 7 is an explanatory diagram in which the number of the probe attached to the board inspection machine used in this embodiment is defined.

FIG. 8 is a trajectory diagram of board inspection data created in this embodiment.

FIG. 9 is a flowchart showing a conventional example in creating board inspection data.

[Explanation of symbols]

 1, 6, 9 Netlist 17, 19 XY robot 18, 20 Contact unit 21 Substrate holder 22, 23, 24 Probe

Claims (2)

[Claims] 1. A method of creating inspection data for operating a continuity inspection device for a printed circuit board, which mounts electronic components using a plurality of XY robots and probes, wherein the net list information of the printed circuit board is divided for each net. From the relationship between the first step, the second step of extracting a reference point in each net, the third step of creating pair information of the reference point and other points in each net, and the coordinate value A printed circuit board inspection data creating method comprising a fourth step of allocating whether to inspect with a probe. 2. The double-sided substrate has a plurality of probes on the front side and the back side, respectively, and further comprises a step of converting inspection data so that the plurality of probes can be moved simultaneously after the fourth step. Item 1. A printed circuit board inspection data creating method according to Item 1.