Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1999-06-11
2001-03-27
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
Reexamination Certificate
active
06208484
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to disk based data storage systems and, more particularly, to filter structures for use therein.
BACKGROUND OF THE INVENTION
A disk drive is a data storage device that stores data in concentric tracks on a disk shaped medium. Data is read from the medium by spinning the medium about a central axis while positioning a transducer near a desired track of the medium to sense the data. The transducer provides an electrical signal representative of the sensed data to data processing circuitry within the disk drive which converts the electrical signal to a format that is recognizable by an attached host unit. The converted data signal is then delivered to the host unit for use thereby. Disk drives can store data in any of a number of different forms, such as magnetic data storage and optical data storage.
Disk drive units are normally enclosed within a housing to protect the workings of the drive from the exterior environment. As can be appreciated, any undesirable substances that exist within the disk drive housing can have a deleterious effect on the operation thereof. For example, in a magnetic disk drive, particles and volatile gases within the drive housing can result in performance problems such as stiction between the magnetic transducer and the disk, transducer crashes, and thermal asperities. To reduce such occurrences, the level of airborne particles and gases within the disk drive should be kept low.
Therefore, there is a need for a filtering structure to reduce the levels of undesired substances within the housing of a disk drive.
SUMMARY OF THE INVENTION
The present invention relates to a recirculation filtering system for use in a disk drive for filtering undesired substances from the air circulating within the disk drive. The system includes a recirculation filter that is optimally located within the disk drive housing in an area beside the disk stack and proximate to the disk drive actuator arm. In addition, the system includes a baseplate shroud that surrounds the disk stack over a large portion of its circumference for reducing the generation of turbulence within the disk drive housing. The system also includes means for channeling air currents from the disk region into the recirculation filter for increasing the filtration efficiency within the drive. The recirculation filter is secured within a frame structure that is inserted into the disk drive housing during manufacture. A portion of the frame is preferably inserted into a recessed pocket within a floor of the disk drive baseplate to hold the frame in place within the drive.
REFERENCES:
patent: 4329722 (1982-05-01), West
patent: 4633349 (1986-12-01), Beck et al.
patent: 4885652 (1989-12-01), Leonard et al.
patent: 5025337 (1991-06-01), Brooks
patent: 5307222 (1994-04-01), Dion
patent: 5406431 (1995-04-01), Beecroft
patent: 5455728 (1995-10-01), Edwards et al.
patent: 5602700 (1997-02-01), Viskochil et al.
patent: 5869009 (1999-02-01), Bellefeuille et al.
Maxtor Corporation
Sigmond David M.
Tupper Robert S.
LandOfFree
Recirculation filter for use in a disk drive does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recirculation filter for use in a disk drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recirculation filter for use in a disk drive will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2465378