JPS584477B2 - print kiban - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board having a structure that minimizes changes in constants of component parts due to applied mechanical stress.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printed circuit board in which the characteristic constants of circuit element components do not change or deteriorate even if the circuit board is subjected to deterioration.

Another object of the present invention is to provide a printed circuit board that allows a thin circuit structure.

A conventional printed circuit board generally has a metal film adhered to an insulating plate made of resin or porcelain.

Bakelite, epoxy, etc. are generally used for resin printed circuit boards.

FIG. 1a is a plan view of a conventional structure in which a ceramic capacitor 1 is soldered to a resin printed circuit board 3 using solder 2. , FIG. 1b is a sectional view thereof.

Reference numeral 4 indicates a copper film pattern, and reference numeral 5 indicates an electrode formed on the ceramic capacitor 1.

When this printed circuit board 3 bends due to mechanical stress, bending stress is applied to the ceramic capacitor 1, causing changes in the temperature characteristics and capacitance value of the ceramic capacitor 1, and in extreme cases, the ceramic capacitor 1 or the soldered part is destroyed. There are cases where

FIG. 2a is a cross-sectional view of a conventional trimmer capacitor constructed by using the electrodes (copper film pattern 17) of the resin printed circuit board 11 as trimmer capacitor fixed electrodes (stator electrodes), and FIG. 2b is a perspective view thereof. .

In the figure, 12 is a fixed electrode, 13 is a rotor, 14 is an adjustment shaft, 15 is a fixed spring, 16 is a rotor electrode, and 17 is a copper film pattern.

If this printed circuit board 11 is bent due to mechanical stress,
A gap occurs between the fixed electrode 12 and the rotor 13, and the capacitance value becomes extremely unstable.

In the conventional configuration in which circuit elements are mounted on a printed circuit board, in order to prevent changes in characteristics and deterioration, the printed circuit board is made thicker, or a separate resin board is installed in the circuit element mounting part and the circuit component component part. There is also a method of attaching a cushioning material such as, but it is difficult to supply an inexpensive and thin circuit structure with either method.

There is also a method of using an insulating substrate made of alumina, steatite, etc. as the insulating substrate material, but this method is susceptible to impact forces and is expensive.

Furthermore, it is difficult to manufacture a board with a complicated shape, so it is not common.

The present invention eliminates this drawback, and an embodiment thereof is shown in FIG.

Figure a is a front view of this example, and Figure b is a front sectional view taken along line AA' in Figure a.

In this example, a hole 24 is provided around the ceramic capacitor mounting portion 22 of a printed circuit board 21, leaving continuous portions 26, 26', and the continuous portions 26, 26' are integrally formed with the printed circuit board. By arranging a copper film pattern on the upper surface thereof, electrical connection to the ceramic capacitor mounting portion 22 is made.

In addition to the configuration of the mounting portion of the circuit element such as the ceramic capacitor described above, the present invention also provides the following configuration as shown in FIG.
It can also be applied to a printed circuit board configuration in which the printed circuit board is used as a stator of a trimmer capacitor.

Its configuration will be explained with reference to FIG. 3 as well.

In FIG. 3, reference numeral 27 denotes a substrate portion constituting a stator of a trimmer capacitor which is a circuit component, and a stator electrode 23 is formed on the surface thereof.

In this example, a hole 29 is provided around the constituent part 27 of the trimmer capacitor, leaving a continuous part 28, and the continuous part 28 is provided with a hole 29.
By applying a copper film pattern on the printed circuit board 21
and the stator board.

As described above, the present invention separates the mounting part of a circuit element such as a ceramic capacitor or the component part of a circuit component such as a trimmer capacitor from the printed circuit board body by a hole, and connects only by a sufficiently thin continuous part, thereby reducing mechanical stress. Even if the main body of the printed circuit board is curved due to the bending of the printed circuit board, the stress on the mounting part of the circuit element or the constituent parts of the circuit component is alleviated by the continuous part, and the influence of the curvature of the main body of the printed circuit board can be avoided, and the change in characteristic constants and It becomes possible to supply printed circuit boards that will not deteriorate.

It is also possible to attach circuit elements such as thick film and thin film elements, and to configure a variable resistor.

The printed circuit board according to the present invention is thin, and takes advantage of stable operation after circuit configuration, and has a very wide range of applications, from general electrical equipment to small electronic equipment such as electronic wristwatches.

FIG. 4 shows a ceramic capacitor 30, which is a circuit element, mounted on a printed circuit board 21 of the present invention using solder 31 at a mounting portion 2 of the circuit component.
2 is a perspective view showing a state in which the trimmer capacitor 32, which is a circuit component, is attached to 27, which is a component of a circuit element; FIG.

[Brief explanation of the drawing]

Figure 1 shows a conventional example of a configuration in which a ceramic capacitor is soldered to a printed circuit board. Figure 2 shows a conventional example in which a trimmer capacitor is configured on a printed circuit board. FIG. 3 shows an embodiment of the present invention. FIG. 4 is a perspective view of a printed circuit board according to the present invention, which includes a ceramic capacitor as a circuit element and a trimmer capacitor as a recycled component. 22 is a mounting part for a ceramic capacitor which is a circuit element; 23
is a stator electrode, 24 is a hole, 25 is a copper film pattern, 2
6 is a continuous part, 27 is a block diagram of a trimmer capacitor which is a circuit component, 28 is a continuous part, 29 is a hole, 30 is a ceramic capacitor which is a circuit element, 31 is solder, and 32 is a trimmer capacitor which is a circuit component.

Claims (1)

[Claims] 1. In a printed circuit board on which a circuit element such as a capacitor is fixed, a hole is provided around the circuit element mounting part of the printed circuit board leaving a sufficiently thin continuous part, and the continuous part is connected to the printed circuit board and the circuit element. A printed circuit board characterized by being configured to connect mounting parts.