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Forming Ferrite Recording Heads Having Narrow Bond Lines

IP.com Disclosure Number: IPCOM000085170D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Robinson, NL: AUTHOR

Abstract

In the IBM Technical Disclosure Bulletin, Vol. 12. No. 7, December 1969. page 984, a method of manufacturing magnetic transducers utilizing high-temperature glass shims deposited on ferrite in conjunction with low-temperature bonding glass is disclosed. This process is now modified and improved. On one of a pair of ferrite blocks high-temperature glass shims are provided having generally uniform height. The maximum height of the shims is not a consideration with regard to the final gap desired between the blocks. Low-temperature glass is introduced into the area between the ferrite blocks by either capillary action or by the prelocation of glass in the ferrite interface, or both.

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Forming Ferrite Recording Heads Having Narrow Bond Lines

In the IBM Technical Disclosure Bulletin, Vol. 12. No. 7, December 1969. page 984, a method of manufacturing magnetic transducers utilizing high- temperature glass shims deposited on ferrite in conjunction with low-temperature bonding glass is disclosed. This process is now modified and improved. On one of a pair of ferrite blocks high-temperature glass shims are provided having generally uniform height. The maximum height of the shims is not a consideration with regard to the final gap desired between the blocks. Low- temperature glass is introduced into the area between the ferrite blocks by either capillary action or by the prelocation of glass in the ferrite interface, or both. Where capillary action is utilized a solid piece of low-temperature glass is located adjacent one or more of the spaces between the blocks, and then the entire structure is heated to at least the melting point of this glass. This causes the low temperature glass to melt and be drawn into the shimmed spaces between the blocks by capillary action.

In an alternative method, notches are provided in the blocks at one or more areas of what will be the ferrite-to-ferrite interface. These notches are filled with low-temperature glass prior to bringing the blocks together. When heated and oriented to subject the melted glass to gravitational forces, this latter structure experiences glass melting and the drawing of the glass into the spac...