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Designing Protruding Profile for Rotors in Helical Scan Recording

IP.com Disclosure Number: IPCOM000085607D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 95K

Publishing Venue

IBM

Related People

Stevenson, PA: AUTHOR [+2]

Abstract

The method and procedure described is an approach for designing protruding profiles (crowns) and rotors used in rotating head devices. This approach eliminates the need for empirical trial and error procedures used in conventional rotor design.

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Designing Protruding Profile for Rotors in Helical Scan Recording

The method and procedure described is an approach for designing protruding profiles (crowns) and rotors used in rotating head devices. This approach eliminates the need for empirical trial and error procedures used in conventional rotor design.

Fig. 1 shows a mandrel-rotor tape support system and identifies some of the relevant geometrical parameters. g(z) describes the rotor profile, w(z) is the tape deflection relative to the prestress tape position, and h(z) is the spacing between tape and rotor. With the aid of the design curves depicted in Figs. 2, 3 and 4 and the machine parameters listed in Table 1, a unique rotor can be established.

The design curves depicted in Figs. 2, 3 and 4 are nondimensional and the nondimensional groupings needed to use these curves are also listed in Tables 2A, 2B and 2C. TABLE 1 * alpha <eth> Helix angle. * c <eth> Constant (0.426). * Et <eth> Product of Young's modulus & tape thickness. * g(0) <eth> Max. penetration of the rotor into the tape measured from prestress level (w=0). t h(O) <eth> Fly height of the tape over the rotor. * 1 <eth> 1/2 rotor width. * Mu <eth> Viscosity of ambient fluid (Mu(air) = 2.62 * 10/9/ lbs sec/in/2/. * r(o) <eth> Radius of mandrel plus spacing of tape over mandrel (prestress radius of tape). * Tau <eth> Total tape tension. * Upsilon <eth> Rotor surface velocity. * b <eth> Tape width. t w <eth> Tape position over rotor relative to pr...