JPH0548236A - Printed-circuit board - Google Patents

Abstract

(57) [Abstract] [Purpose] The object is to obtain a printed circuit board with a reduced number of parts to be mounted, a simple structure of the entire device, and a small number of manufacturing steps. [Structure] By forming wiring patterns on a printed circuit board into first to third spiral wiring patterns 4a, 4c, 4e, the inductors 5a, 5b and the capacitor 5 are equivalently formed.
The printed circuit board is capable of forming c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board used for a control device or the like.

[0002]

2. Description of the Related Art FIG. 6 is a substantial wiring diagram showing a conventional engine control device. In the figure, 1a and 1b are inductors and 1c is a capacitor. Inputs from between input terminals A and B are made by 1a to 1c. A noise filter 1 that removes noise superimposed on a signal is configured.

Reference numeral 2 is an A for converting an analog input signal from which noise has been removed by the noise filter 1 into a digital signal so that the microcomputer 3 can process it.
A / D converter, and 3 is a microcomputer for inputting a digital signal from the A / D converter 2 and controlling the engine. Moreover, these 1 to 3 are formed on a printed circuit board.

[0004]

Since the conventional printed circuit board is constructed as described above, the inductor 1a,
1b and the capacitor 1c have to be mounted separately, and there is a problem that the structure is complicated and the manufacturing process is increased.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a printed circuit board in which the number of parts to be mounted is reduced, the structure of the entire apparatus is simple, and the number of manufacturing steps is small. ..

[0006]

According to the printed circuit board of the present invention, a spiral wiring pattern on the printed circuit board equivalently constitutes an inductor or a capacitor, and the number of parts to be mounted is reduced. It is a thing.

[0007]

In the printed circuit board according to the first aspect of the present invention, the inductor is constituted by the first spiral wiring pattern provided on the surface of the printed circuit board.

The printed circuit board according to the invention of claim 2 is
The first spiral wiring pattern provided on the front surface of the printed board and the second spiral wiring pattern provided on the back surface of the printed board constitute two inductors connected in series.

The printed circuit board according to the invention of claim 3 is
A capacitor is composed of a first spiral wiring pattern provided on the surface of the printed circuit board and a third spiral wiring pattern provided on the surface of the printed circuit board along the first spiral wiring pattern. To do.

The printed circuit board according to the invention of claim 4 is
The first spiral wiring pattern provided on the printed board surface, the second spiral wiring pattern provided on the back surface of the printed board, and the first spiral wiring pattern on the printed board surface And a third spiral wiring pattern provided in the same form a ladder circuit equivalently composed of two inductors connected in series and one capacitor.

[0011]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In the figure, the same components as those shown in FIG. 6 which is a conventional technique are designated by the same reference numerals, and the duplicate description thereof will be omitted.

FIG. 1 is a substantive wiring diagram showing an engine control apparatus according to an embodiment of the present invention. In FIG.
Reference numeral 4a denotes a first spiral wiring pattern (solid line) provided on the surface of the printed board from the input terminal A, and 4b is connected at the center of the first spiral wiring pattern and provided on the back surface of the printed board. Indicated linear wiring pattern (broken line) with inductor 1b and capacitor 1 at both ends.
c is connected, and the noise filter 4 is configured by the above 1b, 1c, 4a and 4b.

Next, the operation will be described. Electric signals from various sensors are taken in as input signals from the input terminals A and B to the engine control device. The input signal from the input terminal A passes through the spiral wiring pattern 4a on the front surface of the printed board, passes from the center of the spiral to the back surface of the printed board, passes through the straight wiring pattern 4b on the back surface, and reaches the inductor 1b. At this time, an inductor is formed by the spiral wiring pattern 4a.

Further, since the other end of the linear wiring pattern 4b is connected to the capacitor 1c connected to the wiring pattern from the input terminal B, the inductors 5a and 5b as shown in the equivalent circuit of FIG. Condenser 5c
It has a function to remove the noise of the input signal as a noise filter composed by.

Example 2. Next, the embodiment of the invention of claim 2 will be explained. FIG. 3 is a substantial wiring diagram showing a noise filter according to an embodiment of the present invention. In FIG. 3, 4a is a first spiral wiring pattern (solid line) provided on the surface of the printed board from the input terminal A. ),
4c is a second spiral wiring pattern (broken line) which is connected at the center of the first spiral wiring pattern 4a, has the same winding direction, and is provided on the back surface of the printed board.

Reference numeral 4d denotes a jumper wire connected to the capacitor 1c from the center of the spiral wiring pattern 4a. The jumper wire 4d is not in electrical contact with the first and second spiral wiring patterns 4a and 4c. It is in a state of.

With such a structure, the first spiral wiring pattern 4a and the second spiral wiring pattern 4 are formed.
c and two inductors connected in series can be configured, and in addition to this, the capacitor 1c can function as a noise filter as shown in FIG.

Example 3. Next, an embodiment of the invention of claim 3 will be described. FIG. 4 is a substantial wiring diagram of a noise filter according to an embodiment of the present invention.
4a is between the inductors 1a and 1b on the input terminal A side,
A first spiral wiring pattern provided on the surface of the printed board, 4e is a third spiral wiring pattern provided on the surface of the printed board from the input terminal B along the first spiral wiring pattern. It is a wiring pattern.

In this way, the first spiral wiring pattern 4a and the third spiral wiring pattern 4e along the first spiral wiring pattern 4a form a capacitor, and the inductors 1a and 1b. , And can function as a noise filter as shown in FIG.

Example 4. Next, an embodiment of the invention of claim 4 will be described. FIG. 5 is a substantial wiring diagram of a noise filter according to an embodiment of the invention of claim 4, in which:
4a is a first spiral wiring pattern provided on the front surface of the printed circuit board from the input terminal A, and 4c is connected at the center of the first spiral wiring pattern 4a and has the same winding direction, It is the second spiral wiring pattern provided above.

Reference numeral 4e is a third spiral wiring pattern provided on the surface of the printed board from the input terminal B along the first spiral wiring pattern.

Similar to the noise filters shown in Examples 1 to 3, the first spiral wiring pattern 4a,
The second spiral wiring pattern 4c constitutes two inductors connected in series, and the first spiral wiring pattern 4a and the third spiral wiring pattern 4e form a capacitor. It can function as a noise filter as shown in FIG.

[0023]

As described above, according to the first to fourth aspects of the invention, the spiral wiring pattern on the printed circuit board enables
Since the inductor or the capacitor is configured, there is an effect that the number of parts to be attached is reduced, and a printed circuit board having a simple configuration as a whole of the device and having a small number of manufacturing steps can be obtained.

[Brief description of drawings]

FIG. 1 is a substance wiring diagram showing an engine control device according to an embodiment of the invention of claim 1. FIG.

FIG. 2 is an equivalent circuit diagram showing the noise filter of FIG.

FIG. 3 is a substantial wiring diagram showing a noise filter according to an embodiment of the invention of claim 2;

FIG. 4 is an actual wiring diagram showing a noise filter according to an embodiment of the invention of claim 3;

FIG. 5 is a substantial wiring diagram showing a noise filter according to an embodiment of the invention of claim 4;

FIG. 6 is a substantial wiring diagram showing a conventional engine control device.

[Explanation of symbols]

 4a First spiral wiring pattern 4c Second spiral wiring pattern 4e Third spiral wiring pattern

Claims (4)

[Claims] 1. A printed circuit board provided with a first spiral wiring pattern which is provided on a surface of a substrate and constitutes an inductor. 2. A first spiral wiring pattern, which is provided on the front surface of the substrate and constitutes an inductor, is connected to the center of the first spiral wiring pattern, and is provided on the back surface of the substrate. And a second spiral wiring pattern that constitutes two inductors connected in series with each other. 3. A first spiral wiring pattern provided on the surface of the substrate, and a first spiral wiring pattern provided on the surface of the substrate along the first spiral wiring pattern. And a printed circuit board having a third spiral wiring pattern forming a capacitor. 4. A first spiral wiring pattern, which is provided on the front surface of the substrate and constitutes an inductor, is connected at the center of the first spiral wiring pattern, and is provided on the back surface of the substrate. A spiral wiring pattern, a second spiral wiring pattern that forms two inductors connected in series, and a first spiral wiring pattern, and the first spiral wiring pattern is provided on the substrate surface. A printed circuit board having a spiral wiring pattern and a third spiral wiring pattern forming a capacitor.