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. 19, 1987
Filed:
Apr. 07, 1986
Johannes P Damen, Eindhoven, NL;
Klaas Prijs, Eindhoven, NL;
Cornelis H Witmer, Eindhoven, NL;
Gijsbertus de With, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A magnetic head (32) having a magnet core (30) of ferrite and a layer of a bonding material (28) consisting of glass in the gap-forming area of the magnet core (38). In order to ensure that on the one hand the ferrite be not attacked by the glass during the bonding process and that on the other hand the temperature adjustment during the bonding process is not too critical, double layer diffusion barriers are provided between the layer of bonding material (28) and the core parts (10) and (10'), respectively, which barriers are formed by a layer of silicon nitride (26) on the side of the bonding layer (28) and a layer of silicon oxide (24) on the side of the core parts (10) and (10'), respectively.