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Thin Film Ferrite Storage Device

IP.com Disclosure Number: IPCOM000094959D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Best, B: AUTHOR [+2]

Abstract

This process is for manufacturing ferrite storage devices from thin films of ferrite sheets. The process entails forming laminated ferrite sheets 4 by conventional laminating ferrite procedures. Once formed, laminated ferrite sheet 4 is attached to a disposable support 2. The latter is preferably made from wax or plastic. The function of support 2 is to facilitate handling or indexing of the required apertures in the final product. Then, laminated ferrite sheet 4 on support 2 is coated with a thin film of metal 6. Conventional photoresist 8 is then superimposed over metal 6.

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Thin Film Ferrite Storage Device

This process is for manufacturing ferrite storage devices from thin films of ferrite sheets. The process entails forming laminated ferrite sheets 4 by conventional laminating ferrite procedures. Once formed, laminated ferrite sheet 4 is attached to a disposable support 2. The latter is preferably made from wax or plastic. The function of support 2 is to facilitate handling or indexing of the required apertures in the final product. Then, laminated ferrite sheet 4 on support 2 is coated with a thin film of metal 6. Conventional photoresist 8 is then superimposed over metal 6.

The compact is then exposed to actinic radiation, the purpose of which is to develop selective patterns on the surface of photoresist 8. Following exposure, conventional developing techniques are employed to bring out the selected pattern on the surface of the compact which, when completed, results in portions of metal 6 being exposed. The exposed metal is then etched away which, in turn, then leaves portions of the ferrite sheet exposed. These exposed portions of ferrite are then chemically etched away or removed by ultrasonic devices. Once completed, heat or chemical solvents are then employed to remove support 2 from ferrite sheet 4.

In this fashion, a ferrite storage plane 10 is formed. Storage plane 10 includes a series of etched or ultrasonically formed cavities or apertures 14 through which drive lines 12 are disposed. Thus, a device is provided in whic...