JP2008292305A - Electrical inspection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical inspection system, smoothly performing electrical inspection for a both-sided board. <P>SOLUTION: This electrical inspection system includes an inspection board which can come into electrical contact with a circuit board, a support plate for supporting the inspection board and the circuit board, a plurality of test probes for outputting an electrical signal, and a sensor for receiving an electrical signal through the circuit board and the inspection board. When a printed circuit board is placed on the inspection board, an electrical signal is output one by one by the plurality of test probes and is transmitted to the printed circuit board through the inspection board to determine whether an end point on the printed circuit board facing the test probe is open-circuited or short-circuited, based on whether the sensor is receiving an electrical signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrical inspection system, and more particularly to an electrical inspection system for testing a double-sided bare board.

  There are two basic types of electronic assembly tests: one is a bare board test and the other is a loading test. The bare board test is performed after circuit board production is completed, and mainly checks for short circuits, open circuits or short circuits, and electrical conductivity in the subnet table. There are many other inspection and verification methods during the manufacturing process. The loading test is performed after the assembly manufacturing process is completed, and is more complicated than the bare board test.

  Assembly phase testing includes production defect analysis (MDA), online testing (ICT) and functional testing (moving the product in the application environment) and a combination of the three. Over the past few years, assembly tests have increased with automatic optical inspection (AOI) and automatic X-ray irradiation inspection. They provide a static picture of the circuit board and a split picture of the X-ray circuit board on different planes to determine weld defects and solder point defects.

There are five types of normal tests, and their main functions are:
1. Bare board test: Inspects open circuit or short circuit and short circuit defect of circuit board with non-adhesive parts.
2. Production defect analysis: Inspect for shorts of solder points and open circuits or short-circuit defects on circuit boards that already have parts attached.
3. Online test: certifies the movement of each part.
4). Functional test: Authenticates the behavior of the functional module of the circuit.
5. Combination test: A combination test of an online test and a function test.

  In a single-sided electrical test, based on an already known circuit design, look for two theoretical endpoints on a printed circuit board (PVC) to be inspected, and each of these two with two probes. Make electrical contact to the endpoint. One of the two probes outputs an electrical signal and the other receives the electrical signal. If the received probe cannot receive the above-mentioned electrical signal smoothly, this endpoint is determined as an open circuit or a short circuit.

  In the case of an electrical inspection of a double-sided board, the above method cannot be carried out smoothly. For this reason, the two end points of the theoretical path on the double-sided board are sometimes on both sides of the printed circuit board, and the electrical inspection designed with the original single-sided board cannot be performed.

  It is a main object of the present invention to provide a kind of electrical inspection system, in which probes and sensors are installed on both sides of the printed circuit board to be inspected to inspect the printed circuit board of the double-sided board.

  For the purposes described above, the electrical inspection system of the present invention is primarily used to inspect double-sided printed circuit boards (with endpoints on each side that are electrically connected to each other). The system of the present invention includes a test plate that electrically contacts the circuit board, a support plate that supports the test board and the circuit board, a plurality of test probes that output electrical signals, and a sensor that receives the electrical signal via the circuit board and the test board. When the printed circuit board is placed on the inspection board, multiple test probes output electrical signals one by one, transmit them to the printed circuit board through the inspection board, and test based on whether the sensor receives the electrical signal It is determined whether the printed circuit board end point facing the probe is open circuit or shorted.

The invention according to claim 1 is an electrical inspection system used for inspecting a printed circuit board of a double-sided board, and having endpoints electrically connected to each other on the printed circuit board.
A support plate made of an insulating material;
An inspection board which is supported and fixed to the support plate, is made of an insulating material, and includes a plurality of metal inspection points, and each inspection point is opposed to an end point on the back surface of the printed circuit board in the position setting;
A plurality of test probes in electrical contact with the front end points of the printed circuit board and outputting electrical signals to these test points;
Including a sensor connected to these inspection points of the inspection board by a conductor and receiving electrical signals of these inspection points,
When the printed circuit board is placed on the test board, electrical signals are output from the test probes, transmitted through the test board to the printed circuit board, and whether the sensor receives the electrical signal. Based on this, an electrical inspection system is characterized in that it is determined whether an end point on the printed circuit board opposite to the test probe is an open circuit or a short circuit.
A second aspect of the present invention is the electric inspection system according to the first aspect, wherein the printed circuit board is a chip-on-film, automatic bonding with a tape, or a flexible printed circuit board.
According to a third aspect of the present invention, in the electrical inspection system according to the first aspect, the support plate includes a wire hole, and the size of the wire hole is a size that allows the conductor connected to the sensor to pass therethrough. And an electrical inspection system.
According to a fourth aspect of the present invention, there is provided the electrical inspection system according to the first aspect, wherein the inspection plate is provided with inspection points that are energized to each other on both surfaces thereof, and is in contact with the surface of the support plate, thereby inspecting these inspection plates. The electrical inspection system is characterized in that the points are connected by a connecting line, the conducting wire connecting surface is energized via the connecting wire, and the conducting wire is welded at the conducting wire joining surface.
According to a fifth aspect of the present invention, in the electrical inspection system according to the first aspect, the plurality of test probes output the electrical signal one by one and transmit it to the printed circuit board through the inspection board, and the sensor Based on whether or not an electric signal is received, it is determined whether an end point on the printed circuit board facing the test probe is an open circuit or a short circuit.

  The electrical inspection system of the present invention has the advantage that it can inspect printed circuit boards with double-sided boards (there are endpoints that are electrically connected to each other on both sides).

  1 to 3 are schematic views of the electrical inspection system of the present invention. In FIG. 1, the support plate 10 is used by the electrical inspection system of the present invention. In FIG. 2 to FIG. 3, the inspection plate 20 is used by the electrical inspection system of the present invention. 2 is a schematic view of the front surface 20a of the inspection plate 20, and FIG. 3 is a schematic view of the back surface 20b of the inspection plate 20.

  4 to 5 are schematic diagrams of implementation of the electrical inspection system of the present invention. FIG. 4 is a completed assembly schematic diagram of the support plate 10 and the inspection plate 20 of the electrical inspection system of the present invention. FIG. 5 is a schematic diagram for inspecting the actual circuit board 32 by the electrical inspection system of the present invention.

  The electrical inspection system of the present invention mainly has electrical contact with the circuit board 32 (see FIG. 5), the inspection board 20, the support board 10 that supports the inspection board 20 and the circuit board 32, and a plurality of test probes 36 that output electrical signals ( 4 and 5), and includes a sensor 30 (see FIG. 5) that receives the electrical installation signal through the circuit board 32 and the inspection board 20.

  As shown in FIG. 5, when the printed circuit board 32 is placed on the inspection board 20, electrical signals are output from the plurality of test probes 36 (one by one output) and transmitted to the inspection board 20 via the printed circuit board 32. Indirectly to the sensor 30. Further, based on whether or not the sensor 30 has received this electric signal, it is determined whether the end point 34 on the printed circuit board 32 facing the test probe 36 is open circuited or short-circuited. Next, assembly and inspection work will be described by explaining each part.

  The printed circuit board 32 is a chip on film (COF), a tape automated bonding (TAB), a flexible printed circuit board (FPC), and both sides are mutually connected. There is an end point 34 through which electricity is supplied.

  As shown in FIG. 5, the electrical signals output one by one from the plurality of test probes 36 are transmitted to the plurality of inspection points 26 on the inspection plate 20 through the conductive wires 30a. Further, it is indirectly transmitted to each end point 34 of the printed circuit board 32 that has already been assembled.

  As shown in FIG. 1, the support plate 10 (made of an insulating material) includes a wire hole 16, and the wire hole 16 has a size sufficient for the lead wire 30 a of the sensor 30 to pass therethrough.

  As shown in FIGS. 2 to 3, the test plate is made of an insulating material and includes a plurality of metal test points 26, and each test point 26 at that position is relative to an end point 34 on the back surface of the printed circuit board 32. To do. On both sides of the inspection plate 20 are these inspection points 26 that are in electrical communication with each other. Specifically, these inspection points 26 can be observed on the front surface 20a of the inspection plate 20, and can also be observed from the back surface 20b. These inspection points 26 are connected by a connecting line 24, communicated with the conducting wire joint surface 28 through the connecting wire 24, and the conducting wire 30 a is welded at the conducting wire joint surface 28.

  At the time of assembly, first, the support plate 10 is fixed on an inspection machine table (not shown) with the machine base fixing part 14 of the support plate 10 shown in FIG. After that, as shown in FIG. 4, the inspection plate 20 is installed on the support plate 10, and the support plate 10 and the inspection plate 20 are firmly coupled to each other through the fixing holes 12 and 22 shown in FIGS. 1 to 3. At the same time, the inspection plate 20 is indirectly fixed on the inspection machine table. When the support plate 10 and the inspection plate 20 are firmly bonded to each other, the conductive wire bonding surface 28 on the inspection plate 20 can be observed from the wire hole 16 of the support plate 10. In this way, the conductor 30a is welded to the conductor joint surface 28, and the electrical signals of the plurality of test probes 36 are transmitted to the inspection board 20 and indirectly transmitted to the printed circuit board 32.

  As shown in FIG. 5, each inspection point 26 of the inspection board 20 is in position opposite to the end point 34 on the back surface of the printed circuit board 32, and when the printed circuit board 32 is placed on the inspection board 20, The end point 34 of the circuit board 32 contacts the inspection point 26 opposite to the inspection board 20. At the same time, a plurality of test probes 36 are in electrical contact with an end point 34 in front of the printed circuit board 32, and theoretically correspond to the electrical signals output by these test points 26. When the plurality of test probes 36 output electrical signals one by one in this way, they are transmitted to the inspection board 20 via the printed circuit board 32 and indirectly transmitted to the sensor 30. Further, based on the sensor 30, it is determined whether the electrical signal is received and whether the end point 34 on the printed circuit board 20 of the test probe is an open circuit or a short circuit.

It is the schematic of the electrical inspection system of this invention. It is the schematic of the electrical inspection system of this invention. It is the schematic of the electrical inspection system of this invention. It is the implementation schematic of the electrical inspection system of this invention. It is the implementation schematic of the electrical inspection system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support plate 12 Fixed perforation 14 Base fixing part 16 Wire hole 20 Inspection board 20a Front surface 20b Rear surface 22 Fixed perforation 24 Connection line 26 Inspection point 28 Conductor joint surface 30 Sensor 30a Conductor 32 Circuit board 34 End point 36 Test probe

Claims (5)

In an electrical inspection system used for inspecting a printed circuit board of a double-sided board and having endpoints that are electrically connected to each other on the printed circuit board,
A support plate made of an insulating material;
An inspection board which is supported and fixed to the support plate, is made of an insulating material, and includes a plurality of metal inspection points, and each inspection point is opposed to an end point on the back surface of the printed circuit board in the position setting;
A plurality of test probes in electrical contact with the front end points of the printed circuit board and outputting electrical signals to these test points;
Including a sensor connected to these inspection points of the inspection board by a conductor and receiving electrical signals of these inspection points,
When the printed circuit board is placed on the test board, electrical signals are output from the test probes, transmitted through the test board to the printed circuit board, and whether the sensor receives the electrical signal. And determining whether an end point on the printed circuit board facing the test probe is an open circuit or a short circuit.   2. The electrical inspection system according to claim 1, wherein the printed circuit board is a chip-on-film, automatic bonding using a tape, or a flexible printed circuit board.   The electrical inspection system according to claim 1, wherein the support plate includes a wire hole, and the wire hole has a size that allows the conducting wire connected to the sensor to pass therethrough.   2. The electrical inspection system according to claim 1, wherein the inspection plate is provided with inspection points that are energized to each other on both surfaces thereof, and is in contact with the surface of the support plate, and these inspection points are connected by a connecting line. An electrical inspection system characterized by energizing the conductor joint surface via the connecting wire and welding the conductor at the conductor joint surface.   2. The electrical inspection system according to claim 1, wherein each of the plurality of test probes outputs the electrical signal one by one and transmits the electrical signal to the printed circuit board through the inspection board, and whether or not the sensor receives the electrical signal. And determining whether an end point on the printed circuit board opposite to the test probe is an open circuit or a short circuit.

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