Method of making glass bonded recording heads

Claim 1

The method of claim 1 wherein the nonmagnetic metallic foil is selected from Havar, beryllium copper, platinum or silver.

Claim 7

A method of fabricating glass bonded electromagnetic recording heads having an effective gap width determined by the thickness of a nonmagnetic metallic layer, comprising: a. selectively locating a thin nonmagnetic metallic layer between two ferrite slabs, said metallic layer having a thickness equal to the desired effective gap width of the recording heads and at least one of said ferrite slabs having a beveled edge and both thereof having an optically flat surface abutting said metallic layer said metallic layer positioned throughout the length of said ferrite slabs; b. compressing the structure to hold the metallic layer in position and establish the effective gap width; c. positioning a glass rod in an open region at each of the beveled edges adjacent to said metallic layer; d. placing the compressed structure in a furnace and heating it to a temperature slightly above the melting point of the glass, said compressing causing sufficient pressure to prevent the molten glass from entering the gap region wherein the foil is located, and e. removing the structure from the furnace, cooling it, and then selectively severing it into a plurality of recording heads of the desired size and shape.