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. 26, 1988
Filed:
Apr. 23, 1986
Budiman Sastra, Eindhoven, NL;
Jan H Mengelers, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A plurality of magnetic head cores is cut from a preprocessed ferrite core block having a gap formed by means of a fracture method. To this end the core block is notched on a line along which the gap is to be formed. subsequently the core block is subjected to a load (tensile stress) until it breaks on the line. A non-magnetic material in a liquid form is provided between the fracture faces which are kept at a desired distance from each other until the material has cured. In a preferred method the core block consists of a first sub-block having a series of yokes and a second sub-block bonded thereto to define the winding apertures. This permits use of a high grade ferrite only at the gap, and further permits winding the limbs of the yoke prior to bonding.