Browse Prior Art Database

Air Film Wedge Standard For Film Thickness Probe

IP.com Disclosure Number: IPCOM000048045D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

DeWalt, DH: AUTHOR [+2]

Abstract

A calibration/monitoring calibration program requires an "artifact standard" such as an air film wedge standard. A glass and ferrite assembly, held against the bottom surface of a transparent disk within a film thickness probe (FTP) fly height tester or any other fly height tester, would make a suitable "artifact standard."

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Air Film Wedge Standard For Film Thickness Probe

A calibration/monitoring calibration program requires an "artifact standard" such as an air film wedge standard. A glass and ferrite assembly, held against the bottom surface of a transparent disk within a film thickness probe (FTP) fly height tester or any other fly height tester, would make a suitable "artifact standard."

A glass channel is fabricated using glass slides 7 epoxied to a planar square 8 of plastic material to form a slot approximately one inch long, 0.076 inch deep and 0.160 inch wide, as shown in the plan view and front and right side elevations, respectively, of Figs. 1,2 and 3. Ferrite heads on a strip of ferrite 10 which is about 0.6 inch in length is epoxied to square 8 in the channel formed between the glass elements 7. The glass and ferrite portions are then ground and lapped to form a common planar surface. After the ferrite has been lapped flat, a flat 3-millimeter glass rod 12 ground to approximately 0.076 inch, as shown in Fig. 5, is epoxied to the plastic square at the channel end, as illustrated in Fig.
4. The glass rod 12 is present to push the high end away from the transparent disk, forming an air wedge with a pitch of 100 microinches per inch. A profilometer can be used to measure the actual height of the glass rod from the flat surface. Lines are scribed at 0.05 inch intervals starting at the leading edge 13 of the assembly and indexed every fifth line (5,10,15) in such manner as t...