JPH08288597A - Printed wiring board - Google Patents

Abstract

PURPOSE: To make a jumper line to have a test pin function by providing a quasi-round hole or a quasi-hole in a position striding over the jumper line so as to allow electric contact with the jumper line from an insertion hole of the jumper line and from both sides of a printed wiring board. CONSTITUTION: Meansuring instruments such as a voltmeter, an ammeter and an oscilloscope are connected to a test pin mounted on a printed board through a probe and an alligator clip to be subjected to inspecting coordination such as of a voltage, a current and a signal waveform. Then, the lower part of a mounting part of a jumper line 10 with a test pin function mounted on a printed board is provided with a round hole 11 several mm in diameter or an angular hole 12 several mm wide so as to allow easy connection of a tip of a connector to the jumper line 10 through this hole, that is a connection from the board rear side is facilitated by providing the printed board with an almost angular hole thus allowing inspection from both sides of the board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting method in which a test pin used for electrically conducting an electric conduction adjustment inspection of a mounting printed circuit board inside a device such as a television receiver is replaced with a jumper wire mounting, and is automatically inserted. The present invention relates to a method and a hole shape for connecting an inspection device to a printed circuit board so that a jumper wire has a function of a test pin.

[0002]

2. Description of the Related Art In a process of assembling a printed circuit board mounted inside a device such as a television receiver, a test pin consisting of one pin or a plurality of pins is inserted into a predetermined position on the printed circuit board by an automatic insertion machine or manual insertion. Had been inserted.

In the case where the printed circuit board on which the components are mounted is to be inspected and adjusted for electrical conduction, a measuring device or the like is connected to a test pin composed of one or a plurality of pins mounted on the printed circuit board through a test probe to measure voltage and waveform. Etc. are taken in and the inspection is adjusted.

FIG. 3 is a circuit diagram showing the meaning of an electric circuit of a conventional test pin and a mounting state. FIG.
FIG. 6 is a diagram showing a case where a conventional test pin and a test pin mounted according to a conventional specification are to be automatically inspected.

Usually, a test pin insertion point is provided at a point where adjustment or inspection is required, and refers to a certain point on a circuit such as point 3 shown in FIG. 3, which is composed of one or more pins on a printed circuit board. A round hole 1 or square hole for inserting the test pin 2 is provided, and the test pin 2 is inserted automatically or manually.

However, the test pin 2 provided at the point 3 is irrespective of whether it is inserted or not.
No electrical trouble is caused in the circuit formed between points 4 and 5 in FIG.

[0007]

The conventional test pin is
Originally, the main purpose was to allow an inspection and adjustment operator to easily connect an inspection and adjustment measuring device such as a test probe to a printed circuit board, and the presence or absence of test pins does not make any sense on the electric circuit.

On the other hand, in the assembly line, it is impossible to electrically and automatically inspect whether the test pins are correctly inserted by an automatic inspector such as an in-circuit tester. In that case, the operator has to visually inspect, and there is a problem that the inspection method takes time or the inspection accuracy decreases.

Further, the test pins are mounted by inserting them into a printed circuit board using an automatic insertion machine or manually by an operator, resulting in an increase in the number of assembly steps and an increase in cost.

On the other hand, as the miniaturization of products progresses, the mounting density of the printed circuit board also increases, and if an operator tries to connect a measuring device to a test pin mounted using a test probe or the like, the test pin There is also a problem that it is not possible to easily connect due to other mounted components existing around.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and electrically contacts the jumper wire from both sides of a printed wiring board with an insertion hole for inserting a jumper wire made of a conductor. It is characterized in that a substantially round hole or a substantially square hole is provided at a position where the jumper wire is straddled so as to be possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit diagram and a mounting state diagram showing a jumper wire made of a conductor having a test pin function when the present invention is carried out. FIG. 2 shows an embodiment of a mounting board.

Generally, an assembled printed circuit board inspection apparatus represented by an in-circuit tester or the like has two contacts provided on an inspection jig from the back surface side of the board at each of points 4 and 5 in FIG. Contact the pins 4, 5
The combined resistance value of the resistors 6 and 7 between them is intended by the measuring circuit in the inspection device.

If an in-circuit tester or the like tries to automatically inspect whether the test pin is inserted or not, as shown in FIG. 4, the contact pin 8 and the test pin provided on the back surface of the printed circuit board at the insertion point of the test pin. Although it is necessary to measure the electrical continuity with the contact pin 9 provided so as to contact the head, this is not practical.

Therefore, as shown in FIG. 1, in the circuit similar to that shown in FIG. 3, the circuit 1 is such that an electric circuit is not formed between points 4 and 5 unless the component 10 is mounted.
0 is provided, and this is used as a jumper wire for automatic insertion or manual insertion.

In this case, if the resistance value between points 4 and 5 is measured by an automatic inspection device such as an in-circuit tester, the jumper wire 10 becomes an open circuit if it is not inserted, and the jumper wire 10 is inserted. In this case, the combined resistance value of parts 6 and 7 is shown, and jumper wire 1
The presence or absence of 0 can be easily automatically inspected.

Usually, in order to inspect and adjust voltage, current, signal waveform, etc., a measuring device such as a voltmeter, ammeter, oscilloscope, etc. is mounted on a printed circuit board through a probe, an alligator clip, etc. Connect to.

However, it is very difficult to connect a connector such as a probe to the test pin depending on the mounting condition of other components mounted around the test pin.

Here, taking as an example the case where a connecting device such as a probe is connected to a jumper wire having the function of a test pin, the jumper wire is usually closely attached to the board by an automatic insertion machine. , It is hard to connect the connector more than the test pin.

Therefore, as shown in FIG. 2, a round hole 11 having a diameter of several millimeters or a square hole 12 having a width of several millimeters is provided below the mounting portion of the jumper wire 10 having a test pin function mounted on a printed circuit board. This allows the tip of the connector to be easily connected to the jumper wire 10 through this hole.

Further, the test pin is usually long on the component mounting side, and is only about 2 to 3 mm on the back surface of the substrate. Therefore, it is very difficult to connect the measuring instrument via a probe or the like when the mounting board is assembled to the operator with the solder side of the board mounted on the operator side.
However, by providing the printed circuit board with the substantially round hole or the substantially square hole as described above, the connection from the back surface side of the board becomes easy and the inspection can be performed from both sides of the board.

[0022]

As described above, according to the present invention, the jumper wire is provided so that the jumper wire made of a conductive material can be electrically contacted with the insertion hole from both sides of the printed wiring board. Since a round hole or a square hole is provided at the straddling position, the jumper wire can have the same function as a test pin, which makes it easy to detect with an automatic inspection device such as an in-circuit tester and assembles the test pin. It also disappears, and the number of assembly steps can be reduced and defects such as non-insertion can be reliably detected.

Further, by providing the mounting printed board with the substantially round hole or the substantially square hole, the jumper wire having the same function as the test pin has an effect of facilitating the connection of the measuring device for inspection adjustment.

[Brief description of drawings]

FIG. 1 is a circuit diagram and an actual wiring diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of a printed circuit board according to the present invention.

FIG. 3 is a perspective view and a circuit diagram showing an example of use of a conventional test pin.

FIG. 4 is a diagram when a test pin according to a conventional technique is to be automatically inspected.

[Explanation of symbols]

 1 Test pin insertion hole 2 Test pin 3 Test pin insertion position 6 Resistance 7 Resistance 8 Contact pin 9 Contact pin 10 Jumper wire 11 Round hole 12 Square hole

Claims (1)

[Claims] 1. A substantially round hole or a substantially square hole at a position where the jumper wire is straddled so that the jumper wire made of a conductor can be electrically contacted with the insertion hole from both sides of the printed wiring board. A printed wiring board having holes.