Method of mounting a ferrite head

Claim 2

In the method of precisely mounting a first member relative to a second member the Steps comprising; fixing the relative positions between said members generally conforming to the finally desired assembled relationship and in such a manner as to establish a first region therebetween for reception of bonding material; locating a first mass of a glass composition in close proximity to said first region; heating said first mass of glass composition to at least the softening point to thereby flow and fill said first region; cooling until said first mass of glass composition solidifies, thereby forming a seal with said first and second members; machining said first member, while being held by said first solidified mass of glass, so that it exactly conforms to its finally desired size and location, simultaneously creating a second region between said first member and said first solidified mass of glass; locating a second mass in close proximity to said second region; heating said second mass to at least the softening point by exposure to a source of infrared radiation to thereby flow and fill said second region without disturbing the seal between said second member and the first solidified mass of glass; and cooling until said second mass of glass composition solidifies and forms a seal with said first mass and first member.

Claim 3

In the method of mounting a glass-gapped ferrite head within a ceramic slider, said head and slider having dimensions of height and width, the steps comprising; fixing the relative positions between said head and slider generally conforming to the finally desired assembled relationship and in such manner as to establish a first region therebetween for reception of bonding material; the initial height and width of said head being greater than required; locating a first mass of a glass composition in close proximity to said first region; heating said first mass of glass composition to at least the softening point to thereby flow and fill said first region; cooling until said first mass of glass composition solidifies, thereby forming a seal with said slider and said head; machining said head while being held by said first solidified mass of glass, so that it exactly conforms to its finally desired width and location, simultaneously creating a second region between said head and said first solidified mass of glass; locating a second mass in close proximity to said second region; heating said second mass to at least the softening point by exposure to a source of infrared radiation to thereby flow and fill said second region without disturbing the seal between said slider and the first solidified mass of glass; cooling until said second mass of glass composition solidifies and forms a seal with said first mass and said head; and grinding and polishing said slider and said head to their finally desired height and smoothness.

Claim 4

In the method of mounting a glass-gapped ferrite head within a ceramic slider, said head and slider having dimensions of height and width, the steps comprising; fixing the relative positions between said head and slider generally conforming to the finally desired assembled relationship and in such manner as to establish a first region therebetween for reception of bonding material; the initial height and width of said head being greater than required; locating a first mass of a glass composition in close proximity to said first region; heating said first mass of glass composition to at least the softening point to thereby flow and fill said first region; cooling until said first mass of glass composition solidifies, thereby forming a seal with said slider and said head; machining said head while being held by said first solidified mass of glass, so that it exactly conforms to its finally desired width and location, simultaneously creating a second region between said head and said first solidified mass of glass; locating a second mass in close proximity to said second region; heating said second mass to at least the softening point by exposure to a source of infrared radiation to thereby flow and fill said second region without disturbing the seal between said slider and the first solidified mass of glass; cooling until said second mass of glass composition solidifies and forms a seal with said first mass and said head; and grinding and polishing said slider and said head to their finally desired height and smoothness.

Claim 5

The invention defined by claim 2 wherein the said masses of glass have melting points less than the melting point of said glass in said ferrite head gap.

Claim 6

The invention defined by claim 2 wherein the coefficients of expansion of said masses of glass are less than the coefficients of expansion of said slider and head.

Claim 7

The invention defined by claim 2 wherein said first mass of glass is heated by exposure to a source of infrared radiation, said second mass of glass being more infrared absorbent than said first.

Claim 8

The invention defined by claim 5 wherein said masses of glass are low-temperature glasses with lead oxide as a primary component in an approximate range of 50-80 percent by weight.

Claim 9

The invention defined by claim 6 wherein said low-temperature glasses include cupric oxide of less than 7 percent by weight concentration as a constituent, to improve infrared absorption properties.

Claim 10

The invention defined by claim 5 wherein said cupric oxide concentration is approximately between 0.05 and 0.1 percent in said first mass of glass and approximately 3.0 percent in said seCond mass of glass.