Electrical connectors – With selectable circuit – e.g. – plug board – Planar circuit overlying a second planar circuit – both...
Patent
1987-02-02
1988-10-18
McGlynn, Joseph H.
Electrical connectors
With selectable circuit, e.g., plug board
Planar circuit overlying a second planar circuit, both...
H01R 1103
Patent
active
047783931
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an improved matrix switch board for connecting with pin plugs, hereinafter referred to as a pin board matrix. Such a pin board matrix may be advantageously employed in various electrical applications, such as electrical switching or exchange systems.
A conventionally known pin board matrix includes a laminated board with two insulative substrates, one provided thereon with a plurality of parallel conductive patterns extending in the X-direction, and the other provided thereon with a plurality of parallel conductive patterns extending in the Y-direction, substantially perpendicular to the X-direction. The laminated board has a plurality of through holes, each penetrating both of the two substrates at positions corresponding to intersections of the respective X-conductive patterns and Y-conductive patterns, so that when a short plug is inserted into a selected through hole, the X and Y-conductive patterns corresponding to the selected through hole are electrically connected to each other via the short plug.
In such a known pin board matrix the elements of the X and Y-conductive patterns are made of resilient elongated metal strips, each having a substantially U-shaped cross-section as a channel. Both side flap portions of each U-shaped strip are provided with a plurality of corresponding slits spaced in the longitudinal direction. One group of these strips also has a plurality of holes spaced in the longitudinal direction for allowing the short plug to pass therethrough and come into contact with the U-shaped strip in the other group. Thus, when the short plug is inserted into a selected through hole, it comes into resilient contact with one of the X-strip channels, passes through the hole of this strip, and then comes into resilient contact with one of the Y-strip channels.
However, in the known pin board matrix, the construction of the elements of X and Y-conductive patterns is complex and, therefore, expensive. In addition, since the pattern element is U-shaped in cross-section, the thickness of the insulative substrate, i.e., the pin board matrix, must be large to accommodate such elements.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a matrix switch having a laminated board including: at least one insulative substrate, a plurality of parallel conductive patterns extending in the X-direction being formed on a first surface of the at least one substrate; and a plurality of parallel conductive patterns extending in the Y-direction, substantially perpendicular to the X-direction, being formed on a second substrate or on a second surface of the first substrate. The laminated board has a plurality of through holes, each penetrating the at least one substrate at positions corresponding to intersections of the respective X-conductive patterns, and Y-conductive patterns. Moreover when a short plug is inserted into a selected through hole, the X and Y-conductive patterns corresponding to the selected through hole are electrically connected to each other via the short plug. Further, the X and Y-conductive patterns are made of resilient metals wires and the at least one is formed with a plurality of parallel guide grooves for receiving the wires.
As mentioned above, according to the present invention, the X and Y-coordinate patterns can be made of simple and less expensive thin metal wires. Therefore, the distance between the adjacent parallel patterns can be advantageously minimized, so that a compact pin board matrix having a high density can be obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cross-sectional, perspective view of a pin board matrix according to the present invention;
FIG. 2 is a partial plan view illustrating a part of an inner section of the pin board matrix shown in FIG. 1;
FIG. 3 is a perspective view illustrating the whole pin board matrix shown in FIG. 1;
FIG. 4 is a partial, cross-sectional perspective view of a pin board matrix according another embodiment of the present invention;
REFERENCES:
patent: 3151923 (1964-10-01), Bell et al.
Hosogai Masao
Hujioka Nobuteru
Imori Yasutaka
Yamamoto Toshihiko
Fujitsu Limited
McGlynn Joseph H.
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