JPH08110362A - Method for inspecting continuity of printed wiring board containing fine pattern - Google Patents

Abstract

PURPOSE: To provide a method for inspecting continuity using an inexpensive tool in the method for inspecting continuity of a printed wiring board containing a fine pattern. CONSTITUTION: In a method for inspecting continuity of a printed wiring board containing a fine pattern, support plates 50 and 51 are laid out at the lower portion of a pitch conversion plate 40 as a tool 30 for inspecting continuity. A pin 60 for contact for electrical contact of a terminal 21 of a reference pattern in a printed wiring board 20 is supported by a conversion plate 40 and the support plates 50 and 51. A pin 61 for contact for electrical contact with a terminal 42 is installed corresponding to terminals 41 and 42 for connection of the conversion plate 40 for electrical contact of a terminal 22 of the fine pattern of the wiring board 20 and the pins 60 and 61 are brought into contact with an inspection electrode 70 for collectively inspecting the continuity of the terminals 21 and 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inspecting continuity of a printed wiring board including a fine pattern.

[0002]

2. Description of the Related Art Generally, a method for manufacturing a printed wiring board is
There are several types, for example, a method of removing unnecessary parts of the copper foil to form a circuit conductor, making a hole using a drill, etc., and then forming a through hole by electroless copper plating, A method is known in which a circuit conductor and a through hole are formed by electroless plating after forming a hole in a portion which becomes a conductor circuit using a permanent resist.

The printed wiring board manufactured by the above manufacturing method has a disconnection 1 in the circuit conductor as shown in FIG. 2 due to the precision of a jig and tool during manufacturing, a printing error when forming a circuit conductor by printing, and the like. A defect such as short circuit 2 may occur.

Disconnection 1 of these circuit conductors and short circuit 2 between circuits
Must be excluded because it cannot operate normally as a circuit.

Therefore, in order to detect the disconnection 1 and the short circuit 2, a continuity test is usually performed.

As shown in FIG. 3, the continuity test is performed by through holes 4 and footprints 5 in the printed wiring board 3.
In addition, the connection information of the circuit is obtained through a current of an arbitrary voltage, and the connection information of the non-defective product created in advance is compared with the connection information obtained, and the quality is determined.

A conventional printed wiring board inspection method is shown in FIG.
As shown in FIG. 5, in order to collectively inspect the circuits formed on the printed wiring board 3 including the fine pattern, an inspection jig including an upper plate 6, a lower plate 7 and a plurality of contact pins 8 is provided. 9 is used to bring one end of the contact pin 8 into contact with the through hole 4 and the footprint 5 of the printed wiring board 3,
The contact information of the printed wiring board 3 including the fine pattern is sent to an analysis device (not shown) by making contact with the inspection electrode 10 that receives the other end of the contact pin 8 to perform the inspection.

Further, as shown in FIG. 5, since the contact portion of the printed wiring board 3 including the fine pattern is brought into contact with the inspection electrode 11 on the 2.54 mm grid, the printed wiring board 3 is formed.
Through hole 4 and footprint 5
Further, the pitch conversion plate 12 is used, and the fine pattern is electrically contacted by using the fine pattern contact terminal 13 and the inspection electrode 11 contact terminal 14.
For the through holes 4 on the mm grid, the pitch conversion plate 12 is brought into contact with the inspection electrode 11 by using the through hole type terminals 15 on the 2.54 mm grid.
The connection information of the printed wiring board 3 having terminals for both the fine pattern and the reference pattern is sent to an analyzer (not shown) for inspection.

A general method is to attach pressure-sensitive conductive rubbers 16 which are electrically conductive only in the thickness direction to the upper and lower sides of the pitch conversion plate 12 by applying pressure.

[0010]

However, with the recent tendency, as the device mounted on the printed wiring board becomes smaller and the terminal pitch of the device becomes narrower, the distance between the footprints of the printed wiring board becomes 0.2 to 10. 0.4m
m becomes narrower, and in the conventional pin-type continuity inspection method, the through-hole 4 and the footprint 5 that come into contact with each other.
If the distance is 0.4 mm or less, the contact with the contact pin 8 is made, and it becomes difficult to perform the inspection.

Further, in the continuity inspection method using the pitch conversion plate 12, the conventional pitch conversion plate 12 including the reference pattern such as the through hole on the 2.54 mm grid is prepared,
It has been pointed out that since the pressure-sensitive conductive rubber 16 is attached to the jig, the jig processing cost rises and the inspection cost becomes expensive.

The present invention has been made in view of the above circumstances, and it is possible to inspect a printed wiring board including a fine pattern having a contact terminal distance of 2.54 mm or less with an inexpensive jig. An object of the present invention is to provide a method for inspecting the continuity of a printed wiring board including a pattern.

[0013]

In order to achieve the above object, the present invention provides a method for inspecting continuity of a printed wiring board, wherein a pattern of terminal pitch includes a reference pattern and a fine pattern formed in a fine pattern. By using an inspection jig that has contact pins inserted through the holes of the board and contact pins that are inserted below the connection terminals of the pitch conversion plate and connect with the inspection electrodes, the reference of the printed wiring board can be obtained. The terminals of the pattern are directly contacted by the contact pins, and the terminals of the fine pattern are electrically contacted by the pitch conversion plate and the contact pins. The feature is that the terminals are collectively tested for continuity.

[0014]

As is apparent from the above structure, the printed wiring board including the fine pattern to which the method of the present invention is applied has a contact terminal interval of 2.54 mm on a grid or 0.4 m.
Those having a terminal interval of not less than 2.5 m and not more than 2.54 mm make direct electrical contact with a contact pin, and the interval between terminals is 0.
If a pitch conversion plate is used to make electrical contact with fine pattern terminals of 4 mm or less, both the standard pattern terminals and the fine pattern terminals can be collectively tested for continuity.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for inspecting a printed wiring board including a fine pattern according to the present invention will be described in detail below with reference to FIG.

In the drawings, first, a printed wiring board 20 to be inspected is provided with through holes 21 and footprints 22, and the terminal intervals of these through holes 21 and footprints 22 are through in this embodiment. The terminal spacing of the holes 21 is set on a grid of 2.54 mm, and the footprint 22 is formed in a fine pattern with a terminal spacing of 0.4 mm or less.

Next, the structure of the jig 30 used in the method of the present invention will be described. In the inspection jig 30, the pitch conversion plate 40 and the two support plates 50 and 51 are appropriately spaced,
The pitch conversion plates 40 and the support plates 50 are fixed to each other in the horizontal direction by columns (not shown).
A plurality of contact pins 60, 61 are installed between 51.

More specifically, of the contact pins 60 and 61, the terminals of the through holes 21 are used to make electrical contact with terminals of a reference pattern such as the through holes 21 on the 2.54 mm grid of the printed wiring board 20. The contact pins 60 are inserted into the holes provided in the pitch conversion plate 40 and the support plates 50 and 51 in accordance with the intervals, and the through holes 2 of the reference pattern are formed.
1 has a function of making electrical contact between the inspection electrode 70 and the inspection electrode 70.

On the other hand, the contact pins 61 on the other side contact terminals formed on the pitch conversion plate 40 with respect to the fine pattern footprints 22 formed at intervals of 0.4 mm or less on the printed wiring board 20. 41, 42 and the reference electrode 70 to make electrical contact with the terminals of the fine pattern.

A pressure sensitive conductive rubber 43 is inserted between the contact terminal 41 provided on the surface side of the pitch conversion plate 40 and the footprint 22 of the printed wiring board 20.

The inspection jig 30 used in the method of the present invention is
Since the printed wiring board 20 having the through hole 21 of the reference pattern and the footprint 22 of the fine pattern is applied to the inspection jig 30 as described above, the through hole 21 of the reference pattern is formed. The terminal of
The inspection electrode 70 can be electrically contacted via the contact pin 60, and the footprint 22 of the fine pattern is connected from the contact pin 61 to the reference electrode 70 via the contact terminals 41 and 42 of the pitch conversion plate 40. Since electrical contact can be made, it is possible to collectively conduct the continuity inspection of the through hole 21 of the reference pattern and the footprint 22 of the fine pattern.

The contact pins 60 and 61 can be used for other jigs, and the pressure-sensitive conductive rubber 43 used for the pitch conversion plate 40 can be partially used. As a jig for inspecting a printed wiring board including a fine pattern, it is inexpensive.

[0023]

As described above, the inspection jig used in the method of the present invention is manufactured at low cost by combining the pitch conversion plate and the contact pin to significantly suppress the use of the pressure-sensitive conductive rubber. In addition to being able to do, because the pitch conversion plate is used for inspection between terminals arranged in a fine pattern,
Since the contact pins do not come into contact with each other and can be performed with high accuracy, there is an effect that the inspection cost can be significantly reduced while maintaining good inspection accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a method for inspecting continuity of a printed wiring board including a fine pattern according to the present invention.

FIG. 2 is an explanatory view showing a state of disconnection and short circuit occurring in a printed wiring board.

FIG. 3 is a plan view showing a general configuration of a printed wiring board.

FIG. 4 is a cross-sectional view showing a conventional printed wiring board continuity inspection method.

FIG. 5 is a sectional view showing a conventional method for inspecting continuity of a printed wiring board using a pitch conversion board.

[Explanation of symbols]

 20 printed wiring board 21 through hole (reference pattern) 22 footprint (fine pattern) 30 continuity inspection jig 40 pitch conversion plate 41, 42 contact terminal 43 pressure-sensitive conductive rubber 50, 51 support plate 60, 61 for contact Pin 70 Inspection electrode

Claims (1)

[Claims] 1. A method for inspecting a continuity of a printed wiring board, wherein a pattern of terminal pitch includes a fine pattern formed on a reference pattern and a fine pattern, and a contact pin inserted through a hole of a pitch conversion plate,
By using an inspection jig that is inserted below the connection terminals of the pitch conversion board and has contact pins that connect to the inspection electrodes, the terminals of the reference pattern of the printed wiring board can be
Directly make electrical contact with the contact pin, and make electrical contact with the pitch conversion plate and the contact pin to the fine pattern terminals, so that the reference pattern and fine pattern terminals on the printed wiring board A continuity inspection method for a printed wiring board including a fine pattern, characterized by conducting a continuity inspection.