JPH05203691A - Device for inspecting wiring of printed wiring board - Google Patents

Abstract

PURPOSE:To provide a device for inspecting the wiring of a printed wiring board by which electric inspection can be performed according to inspection data derived from data about coordinates from the origin of the printed wiring board. CONSTITUTION:An address converting portion converts inspection data in real- time into addreses (card number, pin number) characteristic of a wiring inspecting device by using data about X- and Y-coordinates from the origin of a printed wiring board 5 and Z-data for discriminating between the front and reverse sides, the inspection data showing the relationship of connections in the printed wiring board. An inspecting portion 1 performs the continuity test of the printed wiring board according to this address data converted from the inspection data. The address converting portion is formed using e.g. EP- ROM.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring inspection device for a printed wiring board, and more particularly to a wiring inspection device for performing an electrical inspection for a break or short circuit in the printed wiring board.

[0002]

2. Description of the Related Art FIG. 6 shows the construction of a conventional wiring inspection apparatus for printed wiring boards. This wiring inspection device includes a wiring inspection device portion A including an inspection data storage unit 3, an address conversion processing unit 7, a post-conversion inspection data storage unit 6 and an inspection unit 1, and a wiring inspection device including a jig unit 4. It consists of the ingredient part B. The data stored in the inspection data storage unit 3 is data showing the connection relation of the wiring on the printed wiring board, which is formed by using the X and Y coordinate data from the origin of the printed wiring board and the Z data for identifying the front and back sides. .. Further, the address conversion processing unit 7 converts the connection relation in the inspection data storage unit 3 into the converted inspection data storage unit 6. The data stored in the converted inspection data storage unit 6 is data indicating the connection relationship of addresses (card numbers, pin numbers) unique to the wiring inspection device. The data stored in the converted inspection data storage unit 6 is input to the inspection unit 1. The inspection unit 1 is for conducting a continuity inspection, and an electrical inspection for a disconnection / short circuit of the printed wiring board is performed via a jig portion 4 for electrically connecting to the printed wiring board.

[0003]

However, in the above-mentioned conventional wiring inspection apparatus, the wiring inspection of the printed wiring board can be performed only by the converted inspection data which is the inspection data peculiar to the apparatus whose address is converted in the address conversion processing section. Absent. Therefore, it is necessary to perform the address conversion process as a pre-process for each wiring inspection device.

Further, since the wiring inspection of the printed wiring board is performed based on the inspection data after conversion, even if there is a defect (disconnection / short circuit) in the printed wiring board, the defective portion is the address after conversion (card number, pin). Only the number) can tell. Therefore, there is a problem that it is difficult to analyze which position on the printed wiring board the defect exists.

It is an object of the present invention to provide a wiring inspection apparatus for a printed wiring board, which is capable of performing an electrical inspection with inspection data such as coordinate data from the origin of the printed wiring board.

[0006]

According to the present invention, in a wiring inspection apparatus for electrically inspecting a printed wiring board for breaks and short circuits, X and Y coordinate data from the origin of the printed wiring board and front and back identification are provided. An address conversion unit for inputting inspection data indicating a connection relationship in the printed wiring board using the Z data of No. 1 and converting the inspection data into address data specific to the wiring inspection apparatus in real time;
A wiring inspection apparatus for a printed wiring board is provided, which comprises: an inspection unit that performs a continuity inspection of the printed wiring board based on the address data.

The address conversion unit is preferably an EP
-Configured using ROM. The type of EP-ROM is not particularly limited. Further, the continuity test in the inspection unit is
Normally, the address specified by the inspection unit is performed through a jig unit that electrically connects to the printed wiring board by using inspection pins or the like. The address conversion unit is preferably present on the wiring jig.

More specifically, the wiring inspection apparatus for electrically inspecting the printed wiring board for disconnection and short circuit according to the present invention is more specifically, the X and Y coordinate data from the origin of the printed wiring board and the Z data for identifying the front and back sides. Is used to input the inspection data indicating the connection relationship and convert it into an address (card number, pin number) unique to the inspection device in real time, and is present on the wiring jig and configured by the EP-ROM. The address conversion unit, the inspection unit for inputting the inspection data after the conversion to perform the continuity inspection, and the jig unit for electrically connecting the address designated by the inspection unit to the printed wiring board are provided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the wiring inspection apparatus of this embodiment. This wiring inspection apparatus comprises an inspection data storage unit 3, a wiring inspection device portion A including an inspection unit 1, and an address conversion unit 2 and a wiring inspection jig portion B including a jig unit 4.

The data stored in the inspection data storage unit 3 is
X and Y coordinates from the origin of the printed wiring board 5 (in the present embodiment, in units of 1 micron) and Z for identifying the front and back sides thereof.
The data (0, 1) is used to show the connection relation of wiring in the printed wiring board 5. This inspection data is input to the address conversion unit 2. Address converter 2
Exists on the wiring jig, and for example, two E
It is composed of P-ROMs A and B and a selector C. EP-
Programs for address conversion are stored in the ROMA and B.

The inspection data in the address conversion unit 2 is
In about 1 microsecond per address, it is converted in real time into an address (card number, pin number) unique to the wiring inspection apparatus and address data including the presence / absence of connection between them. Then, with this address data, 2
The inspection unit 1, which has been given the address and the presence / absence of connection between them from the address conversion unit 2, intervenes a jig unit 4 for connecting to the conductor portion of the printed wiring board using an inspection pin or the like, and Conduct continuity check.

Next, the operation of the address conversion unit 2 will be described with reference to FIGS. FIG. 3 is an example of inspection data. In FIG. 3, X and Y coordinates are coordinate data (unit: micron) from the origin of the printed wiring board 5. Z is data for identifying the front and back of the printed wiring board 5, 0 means the front side, and 1 means the back side. Data having the same net number are connected. Therefore, the inspection data of FIG. 3 includes coordinates (500, 1000) on the front surface of the printed wiring board, coordinates (500, 1200), and coordinates (1000, 1000) on the back surface.
2000) means that they are electrically connected, and their coordinates and the coordinates (2000, 2000) on the surface of the printed wiring board are not connected.

The address conversion unit 2 converts such inspection data into a value in the unit of 0.2 mm in coordinates specific to the wiring inspection apparatus, that is, coordinates from the origin of the wiring inspection apparatus. The coordinate space from the origin of the wiring inspection apparatus is set as 0 to 819.2 mm (= t1) for both X and Y coordinates as shown in FIG. 4 (this size is usually sufficient). This coordinate space is divided into a 1.6 mm (= t2) grid.

Usually, one inspection pin is positioned in one grid, and the card number and pin number which are the converted answers are stored in the EP-ROMA. Further, when the wiring on the printed wiring board 5 has a high density, it is conceivable that a plurality of pins exist in the one grid. Therefore, in order to be able to deal with this case as well, the one grid is further divided into eight X and Y coordinates and divided into sub-grids of 0.2 mm (= T3) as shown in FIG. It is assumed that one test pin is located in this sub-lattice, and the card number and pin number which are the converted answers are stored in another EP-ROMB different from EP-ROMA. Moreover, the address of the EP-ROMB is set to EP-RO.
Remember in MA.

In FIG. 6 showing a hardware configuration of the operation of the address conversion unit 2 described above, an EP-ROM is shown.
Each of A and EP-ROMB requires a storage area of 1.5 Mbytes. Therefore, this address translation unit 2
It can consist of 6 bit EP-ROMs and 1 selector.

Further, in the address conversion unit 2, the minimum distance of the inspection pins is data up to 0.2 mm × route 2 = 0.283 mm, and the grid that duplicates two or more pins on the 1.6 mm grid is 8192 (2). Data within ¹³ ) can be converted. Since the conversion time is the sum of the time to read the EP-ROM twice and the time to switch by the selector, the conversion is completed in about 1 microsecond.

[0017]

As described above, according to the wiring inspection apparatus for a printed wiring board of the present invention, the conversion processing of the inspection data into the address peculiar to the wiring inspection apparatus is carried out in real time at the time of inspection, so that the preprocessing is performed. There is no need to convert the address. Further, since the wiring inspection of the printed wiring board is performed with the coordinates from the origin of the printed wiring board, it is possible to easily analyze which position of the printed wiring board the defect exists when detecting a defect such as disconnection or short circuit. ..

Further, since the address conversion unit can be constructed by only a few EP-ROMs and selectors as disclosed in the embodiment, the device for implementing the present invention can be realized at a very low cost. In addition, if the address conversion unit is provided on the wiring jig, the address conversion is performed even when the wiring inspection is performed by combining this same jig unit with another wiring inspection device having a different unique address. Since the inspection can be performed simply by replacing the EP-ROM in the department, the work becomes easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wiring inspection apparatus for a printed wiring board according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a hardware configuration of an operation of an address conversion unit in the embodiment of FIG.

FIG. 3 is an explanatory diagram showing an example of inspection data in the embodiment of FIG.

4 is an explanatory diagram of an example of a coordinate space composed of a 1.6 mm grid from the origin of the wiring inspection apparatus in the embodiment of FIG.

FIG. 5 is a 0.2 mm obtained by dividing one grid of FIG. 4 into a higher density.
It is an explanatory view of a lattice.

FIG. 6 is a block diagram showing a configuration of a conventional example of a wiring inspection apparatus for a printed wiring board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inspection part 2 ... Address conversion part 3 ... Inspection data storage part 4 ... Jig part 5 ... Printed wiring board 6 ... Post-conversion inspection data storage part 7 ... Address conversion processing part

Claims (2)

[Claims] 1. A wiring inspection apparatus for electrically inspecting a printed wiring board for breaks and short circuits, wherein the printed wiring is formed by using X and Y coordinate data from the origin of the printed wiring board and Z data for identifying front and back sides. An address conversion unit that receives inspection data indicating a connection relation on a board and converts the inspection data into address data unique to a wiring inspection device in real time, and an inspection unit that performs a continuity inspection of the printed wiring board based on the address data. A wiring inspection apparatus for a printed wiring board, comprising: 2. The wiring inspection apparatus for a printed wiring board according to claim 1, wherein the address conversion unit is configured by using an EP-ROM.