JP2614034B2 - Printed wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board having a conductive circuit pattern provided on an insulating substrate, and more particularly to a printed wiring board effective for noise suppression and high-density mounting.

[0002]

2. Description of the Related Art A conventional printed wiring board has a large number of wiring boards so that wiring patterns of all circuits including an address bus and a data bus can be mounted on one printed wiring board when performing high-density mounting. Means of forming a laminated multilayer printed wiring board is used.

[0003]

As described above, in the conventional printed wiring board, since the wiring patterns of all the circuits are mounted on one printed wiring board, crosstalk due to an address bus and a data bus is performed. Noise frequently occurs, and it is difficult to take countermeasures. In particular, as the high-density mounting has progressed in recent years and the wiring density of the wiring pattern has increased, the generation of this noise has become a serious problem.

[0004]

According to the printed wiring board of the present invention, a wiring pattern for an address bus and a data bus is separated from a normal printed wiring board, and these are provided on a bus-dedicated printed board and separated from other signal lines. The shield is mounted on the printed circuit board for the device.

That is, the printed wiring board of the present invention has a plurality of signal patterns for use as an address bus or a data bus and a ground pattern provided around each of the signal patterns. It comprises a printed circuit board, and a printed circuit board for circuit elements having a wiring pattern excluding an address bus and a data bus, and a printed circuit board for an element to which the printed circuit board dedicated to the bus is mounted and connected.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a bus-dedicated printed board of the embodiment of FIG. 1, (a) is a view showing its appearance, (b) 3 is a sectional view taken along line AA, and FIG. 3 is a perspective view showing a printed circuit board for an element of the embodiment shown in FIG. is there.

As shown in FIG. 1, this embodiment comprises a printed circuit board 11 for buses and a printed circuit board 12 for devices.

As shown in FIG. 2, the bus-dedicated printed board 11 is provided with a plurality of signal patterns 1 provided in parallel for use as an address bus or a data bus, and for suppressing noise such as crosstalk. And a ground pattern 2 provided around each signal pattern 1. The ground pattern 2 is grounded. A terminal 21 connected to the signal pattern 1 protrudes from the lower surface of the bus-dedicated printed board 11.

As shown in FIG. 3, when the circuit elements 3a to 3d are mounted, the element printed board 12 is connected to those terminals to form a wiring pattern excluding an address bus and a data bus for forming an electronic circuit. (Not shown) is provided. A hole 2 for inserting the terminal 21 of the bus dedicated printed board 11 is provided at one corner of the printed board 12 for the element.
2 are provided.

When assembling the bus dedicated printed board 11 and the element printed board 12, as shown in FIG. 1, terminals 21 of the bus dedicated printed board 11 are inserted into holes 22 of the element printed board 12, and soldering is performed. Do. As a result, the wiring patterns of all the circuits including the address bus and the data bus are connected, so that the electronic circuit can be completed by mounting and connecting the circuit elements 3a to 3d. At this time, since the signal pattern 1 used as the address bus or the data bus is shielded from other signal lines by the ground pattern 2, noise such as crosstalk due to the address bus and the data bus is prevented.

[0012]

As described above, the printed wiring board of the present invention has a plurality of signal patterns for use as an address bus or a data bus, and a ground pattern provided around each signal pattern. By providing a bus-dedicated printed board with a grounded ground pattern, mounting this circuit element, and mounting and connecting to an element printed board provided with a wiring pattern excluding the address bus and data bus, the address bus and data There is an effect that generation of noise such as crosstalk due to a bus can be prevented, and therefore, there is an effect that high-density mounting can be promoted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIGS. 2A and 2B are perspective views showing the bus-dedicated printed board of the embodiment of FIG. 1, in which FIG. 2A is a view showing its appearance, and FIG. 2B is a sectional view taken along line AA.

FIG. 3 is a perspective view showing a printed circuit board for an element according to the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal pattern 2 Ground pattern 3a-3d Circuit element 11 Bus exclusive printed board 12 Element printed board 21 Terminal 22 hole

Claims (2)

(57) [Claims] 1. A bus dedicated printed board having a plurality of signal patterns for use as an address bus or a data bus and a ground pattern provided around each of the signal patterns, and A printed wiring board, comprising: a circuit element having a wiring pattern other than a data bus, and an element printed board to which the bus dedicated printed board is mounted and connected. 2. A semiconductor device comprising: a plurality of signal patterns for use as an address bus or a data bus; a ground pattern provided around each signal pattern; and a terminal projecting from a lower surface and connected to the signal pattern. A bus dedicated printed board having the ground pattern grounded, a wiring pattern excluding an address bus and a data bus, and a hole for inserting the terminal of the bus dedicated printed board having a circuit element and the bus dedicated printed board mounted thereon. A printed wiring board, comprising: a printed circuit board for an element to be connected.