G - Physics – 11 – B
Patent
G - Physics
11
B
352/29.11
G11B 15/64 (2006.01) G11B 5/60 (2006.01) G11B 15/61 (2006.01)
Patent
CA 1084622
MAGNETIC HEAD DRUM CONFIGURATION HAVING A FRICTION REDUCING HELICAL STEP ABSTRACT OF THE DISCLOSURE A magnetic head drum includes an upper section that carries a set of magnetic heads and rotates at a preselected head speed, and a stationary lower section that is character- ized by a reduced diameter step formed along the tape wrap path thereover (e.g., a helical path for a helical scan recorder). Because of the reduced diameter step, tape pres- sure is shifted from the lower drum section to the upper drum section which, by virtue of its rotation, produces a low fric- tion air bearing. The reduction in diameter to produce the above-described step, moreover, results in a shoulder or ledge along the lower edge of the tape wrap path, which shoulder serves as a guide for the tape, and promotes accurate tape tracking over the drum. The amount of reduction in diameter for the lower drum section is not chosen arbitrarily, but is preferably within a range of 1 to 6 mils. In this range, a desirable balance is achieved between reduction in frictional drag and limiting of forces tending to distort the tape. Moreover, it appears that a reduction greater than around 6 mils tends to result in increased tape flutter. - 1 -
253350
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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