US 3,953,813 AGranted

Electromagnetic switch matrix device

AssigneesNippon Telegraph & Telephone Public Corporation, Nippon Electric Co., Ltd.

InventorsNorio Yano, Seiei Okoshi, Sadayuki Mitsuhashi, Norio Suzuki

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Abstract

An electromagnetic matrix switch device, suitable for use in an automatic exchange or computer, comprising a two-dimensional array of cross-point elements, each of which comprises a magnetically actuated switch adapted to bridge its associated pair of row and column signal lines and a magnetic core positioned in magnetically-coupled relationship to the switch to actuate it in response to a current pulse applied to its associated pair of row and column control lines. Each magnetic core has provided therearound first and second windings connected to its associated row control line and third and fourth windings connected to its associated column control line, the polarity of those windings being such that application of the current pulse to the row and column control lines will cause the first and fourth windings to produce magnetic fields in a direction opposite to those produced by the second and third windings. Provision is made for short-circuiting the second and third windings of each magnetic core simultaneously with the application of the current pulse to a selected pair of the control lines, whereby only the magnetic core located at the intersection of the selected pair of the control lines produces a magnetic field sufficient to actuate its associated switch.

An electromagnetic switch matrix device comprising a plurality of row signal lines;

a plurality of column signal lines intersecting substantially at right angles to said row single lines;
a plurality of electromagnetic switching elements disposed at the respective cross-points between said row and column signal lines so as to bridge the corresponding row and column signal lines when their contact points are electromagnetically closed;
first, second, third and fourth winding means wound around said electromagnetic switching elements so as to generate control magnetic fields for controlling the operations of the respective switching elements;
a plurality of row control lines corresponding to said respective row signal lines, each of which includes said first winding means for generating the control magnetic fields in common to all the cross-points aligned on the corresponding row as well as said second winding means for generating the control magnetic fields in common to all the cross-points aligned on the corresponding row;
a plurality of column control lines corresponding to said respective column signal lines, each of which includes said third winding means for generating the control magnetic fields in common to all the cross-points aligned on the corresponding column as well as said fourth winding means for generating the control magnetic fields in common to all the cross-points aligned on the corresponding column;
and means for selectively short-circuiting said second winding means and said third winding means at least in a selected row control line and in a selected column control line, respectively;
the polarity of said first, second, third, and fourth winding means being such that when a predetermined polarity of current pulse is passed through said row and column control lines, said second and third winding means may generate control magnetic fields in the opposite direction to that generated by said first winding means, while said fourth winding means may generate a control magnetic field in the same direction as that generated by said first winding means.

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Abstract

Claims14