Nippon Telegraph and Telephone Public Corporation

Nippon Electric Co., Ltd.

Norio Yano

Norio Suzuki

Sadayuki Mitsuhashi

Hideo Suzuki

Ginya Ishiguro

Seiei Okoshi

Katsuhiro Kato

Yojiro Kishimoto

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.

Electromagnetic switch matrix device

An electromagnetic coordinate selection device comprising a plurality of electromagnetically operated cross point switches arranged in a matrix form and a plurality of magnetic cores disposed at points corresponding to said cross point switches for operation thereof, with any desired cross point switch closed only when the first and second coils wound about the magnetic cores are additively excited wherein the magnetic cores are each of the composite type to stabilize the operation of the cross point switches and the cross point switches are collectively sealed in a single container or in groups in a plurality of vessels provided in a number equal to or smaller than the number of the conductors arranged in the direction of the row or column of said matrix.

Electromagnetic coordinate selection device

Growing community of inventors

Fussa, Japan

Norio Yano