Browse Prior Art Database

Disk Embossing Method

IP.com Disclosure Number: IPCOM000075276D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Treseder, RC: AUTHOR

Abstract

Described is a fixture and method for accurate control of a heat embossing process. The drawing shows disk substrate 1, glass sheets 2 in annular disk shape to match disk 1, disk heaters 3, alignment rings 4, aluminum expansion sleeve 5, sleeve heater 6, steel shaft 7 and nut 8.

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Disk Embossing Method

Described is a fixture and method for accurate control of a heat embossing process. The drawing shows disk substrate 1, glass sheets 2 in annular disk shape to match disk 1, disk heaters 3, alignment rings 4, aluminum expansion sleeve 5, sleeve heater 6, steel shaft 7 and nut 8.

In operation, plastic transfer sheets to transfer a magnetic transfer coating from the transfer sheet, such as MYLAR*, to the disk substrate 1, is placed on either side of substrate 1. Glass sheets 2 are aligned to contact the disk via the transfer sheet with alignment rings 4, and in turn, these are aligned on the steel shaft 7. Nut 8 is tightened to a predetermined pressure to provide intimate contact between the plastic transfer sheets and the glass sheets 2, which are of optical finish. Energizing the heaters 3 and 6 will then, by thermal expansion control as a function of applied heat, expand sleeve 5 to force the transfer sheets into contact with the disk 1. The optical glass sheets 2 will gently press the transfer medium, to have it assume the optical quality of glass surfaces 2. Total movement is small and highly accurately controlled, resulting in a microleveling of the disk transfer surface. * Trademark of E. I. du Pont de Nemours & Co.

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