Disk drive system with hydrodynamic bearing lubricant having charge-control additive comprising dioctyldiphenylamine and/or oligomer thereof

US7212376B2 · kind B2 · utility

Assignee

• Hitachi Global Storage Netherlands, B.V. · NL

Inventors

• John M. Burns · Lomita, US
• Ta-Chang Fu · San Jose, US
• Andrew Hanlon · San Jose, US
• Charles Hignite · San Jose, US
• Thomas E. Karis · Aromas, US
• Richard Kroeker · معلمی نژاد, US
• Stanley Wong · Oceanside, US

Key dates

• Filing date: Sep 26, 2003
• Grant date: May 1, 2007
• Expiry date: Feb 12, 2025

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C2370/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An improved disk drive system that employs a lubricant with improved charge control is provided. The disk drive system is comprised of a rotatably mounted magnetic disk. A rotor is coupled to the disk and rotatably retained by a stator. A bearing is formed that serves as an interface between the stator and the rotor. A motor coupled to the rotor rotates the magnetic disk via the rotor. Located in the bearing is a lubricant having a low relative electrical permittivity.