JPH01214773A - Method for checking short circuit in printed 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] [Industrial Application Field] The present invention relates to a printed circuit board inspection method, and in particular, creates inspection data for short circuit inspection between patterns on a printed circuit board, and performs short inspection only on limited wiring patterns. The present invention relates to a method for inspecting short circuits on printed circuit boards. .

[Prior Art] Conventionally, there has been a device that automatically designs a printed circuit board with the aid of a computer, a so-called automatic printed circuit board design device. In such an apparatus, when designing a printed circuit board, wiring pattern information (pattern data) and hole position data on the printed circuit board (data regarding hole positions for component mounting and hole positions of through holes) are automatically created.

On the other hand, it is necessary to inspect the wiring pattern created in this way, and the inspection is performed by an inspection device called a printed circuit board inspection device. The printed circuit board inspection apparatus inspects wiring patterns using hole position data among the above board data.

In the inspection of wiring patterns, the inspection terminals of the inspection device are brought into contact with the hole positions at both ends of each pattern, and each pattern is inspected for disconnection and the presence or absence of a short circuit between two adjacent patterns is inspected. In an inspection to detect a short circuit between patterns (hereinafter referred to as a short inspection), the presence or absence of a short circuit is inspected by bringing a test terminal into contact with either of the hole positions at both ends of two adjacent patterns.

[Problem to be solved by the invention] In such conventional inspection methods, since there is no information on the spacing between both patterns, it is not possible to perform inspection by focusing only on the patterns with strict clearances (allowable pattern spacing). , all patterns are inspected unconditionally. Note that originally, it is sufficient to perform this short circuit inspection only between patterns with severe clearance.

Therefore, in the conventional print inspection method, there is a problem that the inspection time of the printed circuit board becomes long and the inspection efficiency cannot be improved.

The present invention has been made in view of these points, and involves creating inspection data having minimum spacing data between two patterns in the pattern information, and based on this spacing data, determining the distance between adjacent patterns with a specific spacing or less. It is an object of the present invention to provide a printed circuit board short circuit inspection method that can improve the efficiency of inspection time by performing short circuit inspection only for the present invention.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a short circuit inspection method for a printed circuit board, including a step of setting a clearance for short inspection between patterns, and a step of setting a clearance for short inspection between patterns, and determining the hole position of the read pattern. A step of extracting pattern combinations that are less than the clearance from the data and pattern data, a step of obtaining final hole position data for inspection for the patterns extracted in the step, and a step of short-circuiting only the limited patterns found in the step. It is characterized by consisting of a step of performing an inspection.

[Function] In the present invention, the clearance is arbitrarily set in advance,
Based on the hole position data and pattern data of each pattern that have been read in advance, pattern combinations that have the clearance or less are extracted.

Final hole position data for inspection is created for patterns related to the extracted pattern combinations. Short circuit inspection is then performed only on these limited patterns. Short-circuit inspection is not performed for other patterns.

[Example code] The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a flowchart of the principle of the printed circuit board short circuit inspection method of the present invention.

In the present invention, hole position data and pattern data created by an automatic printed circuit board design device are used.

The operator sets the short-circuit inspection clearance between patterns for short-circuit inspection. This setting is performed using the input terminal of the printed circuit board inspection device.

Next, referring to the provided hole position data and pattern data, a combination of patterns that are less than or equal to the set clearance is extracted. For the extracted pattern, both end hole position data is output, and this is output as hole position data for inter-pattern short inspection.

The printed circuit board inspection apparatus performs a short inspection only on the wiring pattern based on this inter-pattern short inspection hole position data.

Next, a method for extracting a combination of patterns that is less than or equal to the set clearance will be described. In the printed circuit board shown in FIG. 2, a pattern (al.

It is assumed that the minimum interval D1 between a2) and (bl, b2) is an interval that does not require inspection. The other pattern (bl.

It is assumed that the interval D2 between b2) and (c 1 + c 2 ) and the interval D3 between the patterns <cl, c2> and (di, d2) are the intervals to be inspected.

Normally, these standards are found from experience in manufacturing printed circuit boards, and the clearance standard value for inspection is determined by the interval at which pattern contact, such as a bridge, is likely to occur during the manufacturing process of printed circuit boards.

In the case of Fig. 2, if the clearance reference value is Dx, then DI
is set as DI>Dx>(the larger of D2 or D3).

The printed circuit board inspection apparatus extracts, from the printed circuit board data, pattern combinations having a pattern interval smaller than a specified reference value D× for each two pattern combinations. For all the pattern combinations extracted here, data on the hole positions at both ends of the pattern is extracted and used as data for short inspection.

FIG. 3 is a conceptual diagram of a patterned board inspection apparatus for carrying out such a method. In the figure, 1 is an external storage device in which hole position data and pattern data of the printed circuit board are stored, and 2 is an external storage device that stores device data and pattern data, as well as clearance reference values set by the input device 4. A processing device that extracts pattern combinations that are less than the set clearance and obtains data on the hole positions at both ends of the extracted patterns; 3 is a memory that stores programs for controlling each part and data such as hole position data obtained by the processing bag 712; , 4 is an input device for inputting various information necessary for setting the clearance reference value and operating the device; 5 is an input device for appropriately executing the program stored in the memory 3 and giving necessary control signals to each part; A control device 6 is an inspection device that performs various inspections on the wiring pattern of the target printed circuit board, and 7 is a bus for transmitting control signals and data to each part.

The operation in such a configuration will be explained next.

The control device 5 reads the test program from the memory 3 and starts executing it. When the operator sets a clearance reference value using the input device 4, the control device 5 reads this value and stores it in the memory 3. Next, the control device 5 reads data such as hole position data obtained by an automatic printed circuit board design device (not shown) stored in the external storage device 1 and stores it in the memory 3. After that, the processing device 2 is activated.

The processing device 2 reads the clearance reference value from the memory 3, and then reads the hole position data and pattern data (information indicating the position of the pattern, etc.) that are information for each pattern, and makes sure that all pattern combinations are below the set clearance. Extract pattern combinations. Each extracted pattern is stored in the memory 3 as final inspection data.

When the above processing is completed, the control device 5 provides the inspection device with the inspection hole position data of the pattern in which the short circuit inspection is to be performed from the memory 3. The inspection device 6 performs a short circuit inspection based on this hole position data.

In this way, short circuit inspection can be performed only for pattern combinations that are less than or equal to the set clearance.

Although not directly related to the present invention, the processing device 2 extracts the hole position data of all patterns from the external storage device 1, creates hole position data for each pattern for wire breakage inspection, and stores it in the memory 3. You can also. This hole position data for pattern disconnection inspection is output to the inspection device 6 and used for the disconnection inspection.

[Effects of the Invention] As described in detail above, according to the present invention, hole position data is created in order to perform a short circuit inspection between two adjacent patterns, but the clearance standard between patterns that require inspection is Since it is possible to arbitrarily specify a clearance and perform short inspection only on patterns that have an interval equal to or less than that clearance, the inspection time is dramatically reduced compared to the conventional case where short inspection is performed on all patterns. be shortened.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle flow of the printed circuit board inspection method of the present invention, Fig. 2 is a diagram showing an example of a printed circuit board pattern diagram, and Fig. 3 is a diagram showing a patterned board inspection apparatus for carrying out the method of the present invention. It is a conceptual block diagram. DESCRIPTION OF SYMBOLS 1... External storage device, 2... Processing device, 3... Memory, 4... Input device, 5... Control device, 6...
Inspection equipment, 7... bus. Figure 1 No.? Place

Claims (1)

[Claims] In a printed circuit board short inspection method using a printed circuit board inspection device capable of performing a short inspection in which a contact state between each pattern is inspected based on hole position data and pattern data of a pattern on a printed circuit board, the method comprises: a step of setting a clearance for short inspection; a step of extracting pattern combinations below the clearance from the hole position data and pattern data of the read pattern; and a step of setting a final hole position for inspection for the pattern extracted in the step. A printed circuit board short inspection method comprising: a step of obtaining data; and a step of performing a short inspection only on the limited pattern obtained in the step.