The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 1976
Filed:
Dec. 16, 1974
Chris Hawley, Boulder, CO (US);
Peter A Stevenson, Boulder, CO (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A precision-surface is constructed to support magnetic tape on a dynamically-stiff air film above the surface. The precision-surface is achieved by using relatively thick stock material for the bearing. The bearing may be ground to the precise contour and dimensions for the desired tape path. A thin stiff air film between the bearing surface and the tape is provided by deep pools in the bearing surface. The bottom of each pool contains a single small hole in the order of 0.010 inch (0.254 mm.) in diameter for supplying air under pressure to the pool. The small holes are placed in the bottom of the pools preferably by using a thin foil with the holes etched therein and bonding the foil inside the rigid bearing so that the foil becomes the bottom of the pools. The total cross-sectional area of pools on the bearing surface is limited to a small percentage of the area of the bearing surface as the compressibility of the air in the pools can affect the stiffness of the air film.