The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Jan. 09, 1975
Edmond de Niet, Eindhoven, NL;
Adrianus Wilhelmus VAN DEN Enden, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The invention relates to a device for generating time-dependent currents in a coil, for example, a magnetic coil. A magnetic coil of this kind can be used, in combination with a second similar coil, for generating rotary magnetic fields in a device for transporting magnetic bubbles along a guide structure, consisting of discrete elements, on a plate of magnetic material. The device comprises two or more current connection terminals, an LC series oscillator circuit and a switching element which is connected in series with the coil. If the switching element is opened for a period of time amounting to one half to one whole oscillator period, the oscillator performs a whole period. A short-circuit element, connected parallel to the capacitor, can fully discharge the capacitor. When two switching elements are connected between a connection of the coil and a positive and a negative current connection terminal, respectively, whilst the other connection of the coil is connected to an earth terminal, oscillations at a phase difference of 180.degree. can occur. In that case two short-circuit elements are required. A second magnetic field coil can be energized by a device which continues to energize the coil in the rest state, so that the direction of rotation of the rotary magnetic field can be reversed.