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:
Apr. 19, 1988
Filed:
Apr. 30, 1987
Derek B Dove, Mount Kisco, NY (US);
George E Keefe, Montrose, NY (US);
Edward J Yarmchuk, Mahopac, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A magnetographic printing head comprises an array of crossed elongated bar-shaped print elements, each of which is individually magnetizable by electrical conductors wound about respective ones of the print elements. The print elements are arranged in two parallel arrays which are spaced apart from each other to define a passage through which a magnetic medium is to be passed for the imprinting of marks thereon. A mark can be imprinted at each cross point of the crossed arrays upon application of sufficient magnetizing current to each of the print elements at the cross point. The print elements are specifically shaped to provide for concentration of magnetic fields at the cross points in two dimensions to accomplish high resolution printing. The concentration of the fields is accomplished in one embodiment of the invention by the use of a knife-edge configuration to opposed facing surfaces of the elements of the opposed arrays, and in a second embodiment by a set of pedestals upstanding from the elements of one of the arrays. The resulting configuration of the print head has structural simplicity which permits economical fabrication while retaining high resolution in the printing.