Browse Prior Art Database

Disc Storage Apparatus

IP.com Disclosure Number: IPCOM000096372D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Meggit, JE: AUTHOR [+3]

Abstract

A disc 1 has a flat planar recording surface 2. It is rotatable about a fixed main central axis 4 at a constant angular velocity by shaft 5 driven through bevel gears 6 from motor shaft 7. Shaft 7 also drives, through bevel gears 9, the input gear of differential 10 whose planet carrier can be stepped by gear 19. The output gear of differential 10 drives gear 11 about axis 14 spaced from axis 4.

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Disc Storage Apparatus

A disc 1 has a flat planar recording surface 2. It is rotatable about a fixed main central axis 4 at a constant angular velocity by shaft 5 driven through bevel gears 6 from motor shaft 7.

Shaft 7 also drives, through bevel gears 9, the input gear of differential 10 whose planet carrier can be stepped by gear 19. The output gear of differential 10 drives gear 11 about axis 14 spaced from axis 4.

Transistor 3 is carried on depending shaft 12, at the end of an arm 13 rotatable about the axis 14 by the gear 11. The latter is connected to rotate shaft 12 through gears 15, 16 and 17 on arm 13. The gear ratios of the gears 15, 16 and 17 are such that rotation of arm 13 about the center 14 causes rotation of head 3 about its central axis 18 at the same constant angular velocity but in opposite direction. As head 3 rotates about axis 18 and is rotated by the arm 13 over disc 1, it traces a circular track. This is of a radius of curvature equal to the distance between the axes 4 and 14, over the record surface 2 once per revolution Precession of transducer 3 relative to surface 2, to trace other tracks, is achieved by stepping of the gear 19 through a known angle.

The relative velocity between the transducer device and the part of the data record surface over which the head lies is constant and tangential to the information track. Thus, in the case of an air supported head, the distance between the device and the surface is not affected by changes o...