JPS5935006Y2 - printed wiring board - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a printed wiring board on which a plurality of signal lines are printed, and in particular to prevention of induction disturbances due to crosstalk occurring between the signal lines.

As is well known, when connecting several cards mounted with electronic components, signal lines are connected by wrapping or soldering between the cards.

Therefore, the greater the amount of work required to connect these signal lines, the higher the productivity.
Costs tended to decrease as well.

Recently, attention has been paid to this point, and wiring boards have been provided to connect connectors using printed wiring.

However, when this printed wiring is performed, the signal lines are narrowly spaced and parallel to each other, and an induced voltage is generated due to stray capacitance between the signal lines.

That is, a guidance failure occurs due to crosstalk.

Conventionally, in order to reduce the stray capacitance occurring between signal lines, a filter was inserted at the receiving end of the signal line, and the filter was used to prevent induction disturbances due to crosstalk.

Therefore, when the number of signal lines on the receiving end side increases, induction disturbances due to crosstalk cannot be prevented unless a corresponding number of filters are inserted.

As a result, as the number of filters increases, a delay time occurs in signal transmission, making it impossible to quickly transmit signals.

This invention has been made in view of the above points, and is intended to provide a printed wiring board that can prevent induction disturbances due to crosstalk without causing delay time in signal transmission.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

In each of these figures, 1 is a wiring board, 2 is a plurality of signal lines printed on this wiring board, 3 is a common signal line that is printed on the wiring board 1 surrounding these signal lines, and 4 is a common signal line printed on the wiring board 1. is a conductive member made of, for example, a copper plate (hereinafter referred to as a copper plate) fixed to the common of this signal line via the signal line 2, and the figure is an example of a conductive member provided at three locations,
It shows the case where it is fixed by soldering A.

Reference numeral 5 designates an insulating raw material such as mylar tape or thin glass tape inserted between this copper plate and the signal line 2, and the signal line 2 and the common 3 of the signal line, and the signal line 2 and the copper plate 4. and insulate each other.

According to this invention configured as described above, when a conductive member, that is, a copper plate 4 is installed near the signal line 2, the signal line 2
Based on the idea that the stray capacitance that occurs between the signal lines 2 and s' is significantly reduced, the signal lines 2 are
It is set in.

Therefore, the stray capacitance occurring between the signal lines 2 can be significantly reduced by this copper plate 4.

As a result, induction disturbances due to crosstalk can be prevented without providing a filter on the signal line 2, so that signals can be transmitted quickly without causing delay time in signal transmission.

By the way, in the above description, a copper plate was used as the conductive member, but other conductive members may also be used.

Further, although Mylar tape or thin glass tape was used as the insulating member, other insulating members may be used, and even if a button is used in these cases, the same effect as in the above embodiment can be expected.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a plan view and a perspective view of essential parts showing an embodiment of this invention. In the figure, 1 is a wiring board, 2 is a signal line, 3 is a common signal line, 4 is a conductive member made of, for example, a copper plate, and 5 is an insulating member. The same buttons and symbols in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) A plurality of signal lines printed on a wiring board, a signal line common printed on the wiring board surrounding these signal lines, and a signal line common fixed to the signal line so as to cover the signal line. A printed wiring board comprising: a conductive member; and an insulating member inserted between the conductive member and the signal line. (2) The printed wiring board according to claim (1), wherein the conductive member is a copper plate.