JPS601574A - Jig circuit board for inspection of printed circuit board - Google Patents

Abstract

PURPOSE:To achieve an inspection handily and quickly eliminating a connector and without damaging the inspection terminal of a printed circuit board by providing an inspection terminal of a conductor circuit pattern and a contact probe pad on the periphery thereof through an external withdrawing pattern. CONSTITUTION:An inspection terminal (a) of a conductor circuit pattern is formed on a jig substrate for inspection and is connected to a pad (c) on the periphery thereof with an external withdrawing pattern (b) while the pad (c) is connected to a contact probe. When the jig substrate for inspection is pressed on a printed circuit board through a pressure-sensitive anisotropic conductive rubber sheet-like matter 2, the testing for the disconnection and short-circuiting of the printed circuit board can be done handily and quickly using no connector or the like and without damaging it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit board inspection jig for printed wiring boards, and more specifically, for inspecting the presence or absence of disconnections in patterns or conductive short circuits between patterns on a printed wiring board that is an object to be inspected. jigs used for circuit boards.

Conventionally, a device for inspecting the presence or absence of disconnections in patterns on printed wiring boards or conductive short circuits between patterns has been used to connect contact probes (a) to upper and lower insulating plates (b), as shown in the cross-sectional view of Figure 1.
and attach it to the pattern edge (
(hereinafter also referred to as the test end), electricity was applied while it was pressed against the test end.

However, in the above-mentioned conventional testing device, the tip of the contact probe (A) is pressed against the surface of the test end of the printed wiring board →, so the tip of the contact probe scratches a part of the test end surface. The diameter of the broken contact probe is usually 1.5M to 2.5M. Since it is about Qffff, there is a drawback that it cannot be used for inspecting the presence or absence of disconnections or short circuits in printed wiring boards having minute pads such as fine patterns.

Therefore, the inventor of the present invention removed and improved the drawbacks of the conventional inspection equipment described above, and set the contact probe to the inspection end of the printed wiring board of the object to be inspected so that the tip of the contact probe would not be pressed directly against the surface of the inspection end. is a printed wiring board inspection jig in which the pressure-sensitive anisotropic rubber sheet-like material of the circuit board is pressed, and electrical connections are made with external wiring via connector pads at both ends of the pattern. I suggested the circuit board first.

However, the test circuit board using the external connector pad described above always requires soldering to attach the connector, and therefore, the connector must be attached in advance for each different type of printed wiring board pattern to be tested for continuity. The preparation work required a long time, and it was not necessarily suitable for producing a wide variety of products in small quantities, such as printed wiring boards.

On the other hand, when installing the connector, it is necessary to install the jig on the circuit board by approximately 0.8~1.
．． Since it is necessary to drill approximately 0 holes, the area occupied by the pattern is reduced, and furthermore, the degree of freedom in pattern design is restricted by the number of connectors, making it difficult to refine the pattern.

In addition, as shown in Figure 2, the number of connector pads is limited, for example 25 to 5, at both left and right ends of the inspection jig plate.
Since the number of zero points is usually provided in parallel, the printed wiring board of the object to be inspected has a complicated pattern, the number of inspection ends increases significantly, and the There are limitations such as the inability to inspect items that have a relatively large number of test ends, such as multilayer wiring boards, and products that have a large number of test ends, such as multilayer wiring boards.

The present invention makes use of the features of the conventional method described above, and instead of soldering the connector, the contact probe is fixed to an insulating plate, etc., and this is connected to the pad for the contact probe on the jig circuit board. In addition to eliminating preparatory work such as connector soldering, printed wiring boards can be inspected simply and quickly, and by eliminating the need for drilling holes for connector installation, the degree of freedom in pattern design has been improved, and the detection end and external output have been improved. The present invention provides a printed wiring board inspection jig circuit board having contact probe pads on the periphery of the pattern.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 3 is a plan view of the printed wiring board inspection jig circuit board of the present invention. In this drawing, (1) is a conductive circuit pattern as a detection end, which is usually a copper foil or copper foil surface formed on the surface of a printed wiring board with good dimensional stability such as a glass epoxy board or a ceramic board. It is a conductor circuit plated with metal. In other words, this 8-electronic circuit portion corresponds to the pattern end of the printed wiring board that is the object to be inspected. A pressure-sensitive anisotropically conductive rubber sheet (2) is attached to the conductive circuit pattern portion serving as the detection end via an adhesive or temporarily fixed with cellophane tape, as necessary. When this pressure-sensitive anisotropically conductive rubber sheet material is pressed, conductivity is developed through conductive substances scattered in different directions in the sheet material, and the printed eel board, which is the object to be inspected, is It is sandwiched between the detection end of the test jig circuit board and the detection end of the test jig circuit board, and this part has the characteristic of conducting electricity in an elastic state. That is, the present invention makes use of the characteristics of this pressure-sensitive, anisotropically conductive rubber sheet, and replaces the conventional contact probe with a test jig circuit board and, if necessary, as a detection end of this circuit board. By attaching it to the surface of the pattern end with an adhesive or the like, the pattern end of the printed wiring board that is the object to be inspected and the pattern end of the test jig circuit board are pressed together as described above. The main principle is that it does not damage the surface of both pattern ends, and that it makes soft contact with minute pads and lands like a fine pattern, and conducts electricity in a clamped state. It is.

Next, (3) is a pattern for external extraction, and is a portion connected to the detection end by a conductive circuit.

Then, the detection end (1) and the external extraction pattern (3
) are provided with a large number of contact probes (4) around the periphery, making it possible to test for disconnections or short circuits on objects with many detection ends, such as printed wiring boards with complex patterns. Furthermore, the degree of freedom in designing the pattern of the jig circuit board itself is increased, making it possible to downsize the jig circuit board.

This point is a further improvement of the test jig circuit board shown in FIG. 2, which was previously proposed by the present inventor.

In this way, the printed wiring board inspection jig circuit board of the present invention has a conductive circuit pattern (1) as a detection end on the surface of the board.
), an external extraction pattern (2) is formed from the detection end, and a large number of rows of contact probe pads (4) are provided at both ends of the external extraction pattern, and the detection end and the contact probe A corrosion-proofing and insulating resin film, for example, a film of various thermosetting resins such as epoxy resin or polyester resin, is formed on the surface of the pattern other than the pad.

However, the above-mentioned anticorrosive and insulating resin coating is not shown in the drawings.

Next, FIG. 4 shows an apparatus (hereinafter abbreviated as printed wiring board) that uses the printed wiring board inspection jig circuit board of the present invention to inspect the presence or absence of disconnections or short circuits in various printed wiring boards to be inspected. FIG.

In this drawing, (5) is a printed wiring board inspection jig circuit board, which has an inspection end (11) on the surface of the board as shown in the plan view of FIG. A contact probe pattern (3) is formed on the periphery of the external extraction pattern, and a contact probe pad (4) is formed on the periphery of the external extraction pattern, and an anticorrosive and insulating resin film is formed on the surface of the pattern other than the detection end and the contact probe pad. (2) is a pressure-sensitive, anisotropic, isoelectric rubber sheet-like material, which covers the surface of at least the pattern end (1) serving as the detection end of the printed wiring board inspection jig plate of the present invention. -H needs to be present. Therefore, it is preferable that the detection end is attached in advance to the surface of the detection end with an adhesive.

However, a set placed on both sides of a printed wiring board can also be sandwiched between the inspection jig plates of the present invention, and an adhesive tape can be applied to the surface of the inspection end portion of the inspection jig plate of the present invention. It is also possible to temporarily attach the sensor via an adhesive and make it removable, so it is not necessarily necessary to attach it to the detection end surface via an adhesive.

Next, (6) is a pad for a contact probe, which is a part that electrically contacts a large number of contact probes 0, which are mounted in advance on an insulating plate of a pressurizing device, in a clamped state.

This contact probe pad is connected to a power source by wiring, and is electrically controlled by a sequencer or computer as necessary to automatically check whether there is a disconnection or short circuit on the printed wiring board that is being tested. Detected quickly. (7) is a smooth plate of the pressurizing device.

When conductive circuits are formed on both sides of the inspection jig circuit board of the present invention, the smooth plate is always laminated with an insulating plate, an insulating layer is placed on the surface of the metal smooth plate, or an insulating layer is placed on the surface of the metal smooth plate. It is necessary to apply paint to the surface of the smooth metal plate. However, when a conductor circuit is formed on only one side like the test jig circuit board of the present invention, the back side is a smooth surface with insulating properties like an epoxy resin or ceramic substrate. The smooth plate of the pressurizing device may be a conductor such as a metal smooth plate.

In addition, the inspection jig circuit board of the present invention is made of a board with excellent dimensional stability, such as an epoxy resin or Naramix board, so it has high precision and reliability, and is printed with fine patterns. It is suitable for inspecting wiring boards, and can also be used for inspecting flexible boards, multi-layer boards, and various printed wiring boards with complex patterns on both sides with a large number of through holes, and has a wide range of features. be.

The circuit board of the printed wiring board inspection jig of the present invention having the above-mentioned features is applied with a pressure of about 1 to 31 g/c1 to clamp the entire circuit board, and electricity is applied through the contact probe. For example, through the inspection end of the circuit board of the inspection jig, the pressure-sensitive conductive rubber sheet, and the inspection end of the printed wiring board of the object to be inspected, it is possible to quickly and easily check whether there is a disconnection or short circuit in the printed wiring board. Highly reliable inspection can be performed automatically without causing any damage to the surface of the object to be inspected.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional inspection device, Fig. 2 is a plan view of a printed wiring board inspection jig circuit board of the present invention, and Fig. 3 is an inspection using the inspection jig circuit board of the present invention. FIG. In the above drawing, 1...... inspection end, 2...
......Pressure-sensitive anisotropic conductive rubber sheet-like material, 3.
・・・・・・External extraction pattern, 4・・・・・・
...Pad for contact probe. Name of Patent Applicant IBIDEN Co., Ltd. Representative Jun Taga Part 3-±” Figure 2 Figure 4

Claims (1)

[Claims] 1. A conductor circuit pattern as a test end is provided on a printed wiring board, and a conductor circuit pattern for external extraction connected to the detection end is formed, and the detection end and the conductor circuit pattern for external extraction are formed. A printed wiring board inspection jig circuit board having a contact probe pad at the base of the pattern. 2. The test jig circuit board according to claim 1, wherein a corrosion-proofing and insulating resin film is formed on the pattern surface other than the detection end and the contact probe pad. 3. At least a pressure-sensitive anisotropic conductor is provided on the surface of the inspection end.
An inspection jig circuit board according to claim 1 or 2, characterized in that an α-rubber-like member is attached.