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:
Jul. 07, 1992
Filed:
Mar. 30, 1990
Norman J White, Kinross, GB;
Ronald W Woolley, Poole, GB;
Rodime PLC, , GB;
Abstract
A spindle assembly with air bearings for use in a hard disk storage device. The spindle assembly consists of a stationary shaft assembly and a rotating hub assembly that is supported in rotation by self-acting air bearings formed between adjacent axial and radial surfaces of the shaft assembly and the hub assembly. The shaft assembly includes a stationary shaft. A cylindrically hollow ceramic sleeve is fitted around the shaft. A double herringbone groove pattern is indented into the outer cylindrical surface of the sleeve. A further hollow ceramic cylinder fits over the sleeve such that a suitable air bearing can develop between the outer surface of the sleeve and an inner surface defined in the cylinder. Two disk-shaped ceramic thrust plates are fitted around the shaft, one on either side of the hollow sleeve. The innermost surfaces of the thrust plates are indented with a herringbone groove pattern such that a suitable air bearing can develop between the surface of the thrust plates and the flat end surfaces of the cylinder. A motor stator assembly is fitted to the end of the stationary shaft beyond one of the thrust plates, and a magnetic rotor assembly is fitted to the inside surface of a rotating aluminum hub adjacent to the stator.