Abstract: Ultraviolet-transparent seals, flange, and sleeve assemblies are used in actuator pivot cartridges for hard disk drives to cure adhesive located inside the pivot housing. The assemblies are formed from silica glass, polymers, or other suitable materials, and focus UV light into hard to reach, high aspect ratio areas between the pivot bearings, sleeve, and shaft. Some of the assemblies use transparent components with convex or fresnel lenses formed into their geometry. With these designs, UV light can enter the pivots axially and/or radially to reach and cure the adhesive regardless of its location.
Type:
Grant
Filed:
August 31, 1999
Date of Patent:
October 9, 2001
Assignee:
International Business Machines Corporation
Inventors:
Walter Lloyd Prater, Eric Martin Albertson
Abstract: An apparatus for reducing manufacturing cost and increasing disc drive actuator assembly stiffness. A post extends from a base deck and supports an actuator assembly and cartridge bearing. In particular, the cartridge bearing comprises a stationary shaft, a bearing supported by the shaft, and a sleeve rotatably supported by the bearing for rotation about the stationary shaft. A first tolerance ring is disposed between an inner surface of the shaft and the post to secure the cartridge bearing in place during assembly. A second tolerance ring is interposed between the cartridge bearing and the E-block to secure the E-block.
Type:
Grant
Filed:
September 24, 1999
Date of Patent:
September 11, 2001
Assignee:
Seagate Technolocy LLC
Inventors:
Nigel F. Misso, Steve S. Eckerd, Daniel M. Heaton
Abstract: An apparatus for isolating vibration in pivot bearing assemblies that is incorporated in a standard pivot bearing assembly without requiring modification of the pivot bearing assembly. Washers are used between the pivot bearing assembly and the base plate of a disc drive upon which the assembly is mounted. In addition, a second washer is positioned on the shaft of the assembly and is held in place by a shoulder screw which fastens the assembly to the base plate.
Type:
Grant
Filed:
June 11, 1999
Date of Patent:
July 3, 2001
Assignee:
Seagate Technology LLC
Inventors:
Wai Onn Chee, Joseph Heng Tung Lau, Michael Joo Chiang Toh, Xiong Liu
Abstract: A ferrofluid seal for a hard disk drive actuator bearing has two circular plates which are axially spaced apart about a nonmagnetic pivot shaft of the actuator. The plates are parallel and in close proximity to one another. The upper plate is made of magnetically-conductive steel and is mounted to a stationary sleeve which surrounds the shaft. The lower plate is mounted to the shaft and has an annular magnet with pole pieces on an upper surface. A magnetic ferrofluid is located between the magnet and the upper plate to complete the magnetic circuit and form a seal. The ferrofluid seal prevents bearing emissions such as grease oil vapor and aerosol droplets from contaminating the disk drive.
Type:
Grant
Filed:
November 13, 1998
Date of Patent:
May 8, 2001
Assignee:
International Business Machines Corporation
Abstract: A device for fixing an actuator and a cover in a hard disk drive is provided with a body base having a boss and a screw hole formed on the boss. A pivot bearing is formed at the center of the actuator and fit around the boss, a cylindrical ring of a predetermined length is closely inserted into the pivot bearing, a hole is formed on the cover, and a pivot screw is tightened into the screw hole of the boss through the hole of the cover and the cylindrical ring. Therefore, the actuator and the cover are simultaneously fixed on the base body by the pivot screw.