JP2502519B2 - Printed circuit board manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a printed circuit board in which a circuit can be opened during the manufacturing process and then closed.

2. Description of the Related Art In recent years, a printed circuit board using a ceramic substrate as an insulating substrate has come into use. In the case of such a printed circuit board, for example, resistors are formed by printing, other parts are also made into chip parts without lead terminals, and electrodes at both ends are connected to a conductive pattern by soldering to increase the density. I am trying.

Fig. 2 shows an example of such a printed circuit board. Reference numeral 6 is a chip jumper for connecting circuits. Before mounting the chip jumper 6, signals are separately input to the conductor patterns 4 and 8 and printed. The resistor 2 is trimmed to obtain a predetermined output signal. After performing this step, the chip jumper 6 is connected between the conductor patterns 4 and 8 by soldering to close the circuit. In the figure, 1 is an insulating substrate, 3 is a conductor pattern, 5 is a chip component, and 7 is a terminal for electrically connecting this substrate to another printed circuit board.

However, in the production process of such a printed circuit board, it is necessary to attach the circuit jumper chip jumper 6 after the function trimming of the printed resistor 2 after the soldering of the chip component 5. , Not only the dedicated circuit jumper chip jumper 6 for the circuit short circuit is required, but the chip component 5 and the circuit jumper chip jumper 6 cannot be soldered at the same time, and the soldering work occurs twice. There has been a problem that the efficiency of the conductor pattern connection work for the adjustment work in the printed board production process is extremely low.

The present invention solves the above-mentioned problems of the prior art, and with a simple structure, it is possible to improve the efficiency of the connecting work of the conductor pattern after the adjusting work, and to manufacture an excellent printed circuit board with low cost. The purpose is to provide a method.

Means for Solving the Problems The present invention is for achieving the above-mentioned object, and includes a first resistor between a first conductor pattern and a second conductor pattern, which are independently formed on the same plane of a substrate. Arrange the elements,
Similarly, a chip component is arranged between the third conductor pattern and the second conductor pattern, which are independently formed on the same plane of the substrate, and a signal is output from the first conductor pattern and the third conductor pattern. Is input, functional trimming is performed on the first resistance element so that a predetermined output is obtained from the second conductor pattern, and then the first conductor pattern and the third conductor pattern are short-circuited. It is characterized in that the connection terminals are mounted on the same plane.

With the above-described structure, the present invention is configured to connect a plurality of conductor patterns including a conductor pattern connected to an element that requires adjustment, after adjustment, with terminals for electrically connecting to an external circuit. It is possible to reduce the number of parts and the number of steps required when connecting the conductor patterns after the adjustment work in the board production process.

Embodiment A printed circuit board device according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the conductor patterns 3, 4 of the insulating substrate 1
A print resistor 2 is printed between them, a chip component 5 is connected between the conductor patterns 3 and 8, and a signal is input from the conductor pattern (input pattern) 4 and the conductor pattern (input pattern) 8 and a conductor (output) pattern. The printed resistor 2 is functionally trimmed so that a predetermined output signal can be obtained from the terminal 3 and then the terminal 7
Is attached and soldered to short-circuit the conductor patterns 8 and 4.
According to this structure, since the terminal 7 is used when connecting the conductor patterns 4 and 8 after the function trimming of the printed resistor 2, a special part for connecting both conductor patterns is required. The chip jumper for circuit shorting, which has been used in the past, can be eliminated. Moreover, the chip jumper for circuit short circuit is not required, so the soldering work can be done only once. In this way, it is possible to reduce the number of parts and man-hours required when connecting the conductor pattern after the adjustment work in the production process of the printed circuit board, and greatly improve the efficiency of the connection work of the conductor pattern after the adjustment work. Can be made. Further, as shown in the present embodiment, the terminal 7 does not need to be specially processed for short circuit, and the terminal conventionally used as a terminal for electrically connecting to an external circuit can be used. .

The function trimming in this embodiment is an example of adjustment.

EFFECTS OF THE INVENTION As is apparent from the above description, in the method for manufacturing a printed circuit board of the present invention, a plurality of conductor patterns including a conductor pattern connected to an element requiring adjustment are electrically adjusted to an external circuit after adjustment. Since it is composed of terminals for connection, it is possible to improve the efficiency of the connection work of the conductor pattern after the adjustment work, and it is possible to provide an excellent printed circuit board manufacturing method with low cost. is there.

[Brief description of drawings]

FIG. 1 is a plan view of a printed circuit board device according to an embodiment of the present invention, and FIG. 2 is a plan view of a conventional printed circuit board. 1 ... Insulating substrate, 2 ... Printing resistor, 3 ... Conductor pattern (output pattern), 4 ... Conductor pattern (input A pattern), 8
...... Conductor pattern (input B pattern), 5 …… Chip parts, 7 …… Terminal.

Claims (1)

(57) [Claims] 1. A first resistance element is arranged between a first conductor pattern and a second conductor pattern, which are independently formed on the same plane of a substrate, and are also independently formed on the same plane of the substrate. A chip component is disposed between the third conductor pattern and the second conductor pattern formed as described above, a signal is input from the first conductor pattern and the third conductor pattern, and the second conductor pattern is formed. The first resistance element is functionally trimmed so that a predetermined output can be obtained from it, and then external connection terminals for short-circuiting the first conductor pattern and the third conductor pattern are mounted on the same plane. A method for manufacturing a printed circuit board, characterized in that.