Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1999-10-26
2002-02-05
Evans, Jefferson (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S098070
Reexamination Certificate
active
06344946
ABSTRACT:
This invention relates to disk storage devices and, more particularly, to a disk storage device having a spindle motor with enhanced torque, acceleration and vibration characteristics.
BACKGROUND OF THE INVENTION
Disk storage devices, especially disk storage devices utilizing one or more rigid magnetic data storage disks directly coupled to the rotor of a spindle drive motor typically use an “outer rotor” brushless DC motor for rotating the storage disks past data read/write heads. The heads write and read digital data on the surface of the disks. In an “outer rotor” brushless motor, a rotor having an annular permanent magnet surrounds a multi-pole stator that is mounted concentric with the shaft defining the rotation axis of the motor.
An outer rotor motor employs a rotor that encompasses the stator element. The rotor therefore requires a diameter that adds to the mass and angular inertia of the rotor and increases the time required for the motor to reach the operating speed, which may be 6000 RPM or higher, at the time of startup. The radially displaced mass also amplifies vibrations due to imbalances, especially at higher operational speeds.
It is an object of the invention to provide a disk storage device that utilizes a spindle drive motor that has a reduced rotary mass and angular inertia and accordingly reduces the time required to accelerate the storage disks to operating speed at the time of startup.
It is a further object to provide a disk storage device that has an increased diameter spindle support structure to enhance the rigidity of the disk axis.
Still a further object is to provide a disk storage device that reduces the amount of spindle run out caused by play in the support bearings.
Another object is to allow location of the drive elements of the spindle motor outside the clean room chamber without significantly increasing the mass or angular inertia of the rotating elements.
Yet another object is to provide a disk storage device that reduces radially-displaced spindle mass and is capable of operation at higher speeds with lower vibration.
SUMMARY OF THE INVENTION
The foregoing and other objects are achieved by providing a disk storage device that utilizes an inner rotor spindle motor in which the spindle shaft is fixed to the disk mounting hub and rotates therewith. Support for the spindle is provided by a bearing tube that has a greater diameter and greater rigidity than the stationary shaft or post typically employed to support the disk stack in an outer rotor arrangement. The bearing tube supports the bearings in which the spindle shaft is journalled and allows wider axial spacing between the bearings, reducing spindle run out. At the same time, the bearing tube functions to entrap contaminants from the bearings within the internal motor space and reduces contamination in the clean chamber. Further, the motor elements are located outside the clean room chamber, further enhancing the cleanliness of the environment surrounding the data storage disks.
These and other objects, features and advantages of the invention are illustrated in the following description of preferred embodiments, as illustrated in the drawings as follows.
REFERENCES:
patent: 3250929 (1966-05-01), Maier
patent: 3596121 (1971-07-01), Sheldon
patent: 3691542 (1972-09-01), Gabor
patent: 3706085 (1972-12-01), Mowrey et al.
patent: 3845339 (1974-10-01), Merkle et al.
patent: 3864748 (1975-02-01), Herdman et al.
patent: 3922590 (1975-11-01), Warren et al.
patent: 4054931 (1977-10-01), Bolton et al.
patent: 4062049 (1977-12-01), Dirks
patent: 4101945 (1978-07-01), Butsch
patent: 4115715 (1978-09-01), Müller
patent: 4150406 (1979-04-01), Stollorz
patent: 4167692 (1979-09-01), Sekiya et al.
patent: 4174484 (1979-11-01), Schmider
patent: 4181867 (1980-01-01), Muller
patent: 4185308 (1980-01-01), Fujioka
patent: 4197489 (1980-04-01), Dunn et al.
patent: 4216512 (1980-08-01), Vidwans
patent: 4275339 (1981-06-01), Burke et al.
patent: 4285016 (1981-08-01), Gilovich
patent: 4307425 (1981-12-01), Kaneko et al.
patent: 4329604 (1982-05-01), Dunstan et al.
patent: 4336470 (1982-06-01), Gutris
patent: 4337491 (1982-06-01), Hasler et al.
patent: 4352133 (1982-09-01), Hager
patent: 4394594 (1983-07-01), Schmider et al.
patent: 4396964 (1983-08-01), Morehouse et al.
patent: 4430603 (1984-02-01), Muller
patent: 4438542 (1984-03-01), Schuh
patent: 4471395 (1984-09-01), Beck et al.
patent: 4519010 (1985-05-01), Elsaesser et al.
patent: 4535373 (1985-08-01), Schuh
patent: 4554473 (1985-11-01), Muller
patent: 4556829 (1985-12-01), von der Heide
patent: 4599664 (1986-07-01), Schuh
patent: 4604665 (1986-08-01), Müller et al.
patent: 4607182 (1986-08-01), Ballhaus
patent: 4656545 (1987-04-01), Kakuta
patent: 4658312 (1987-04-01), Elsásser et al.
patent: 4672250 (1987-06-01), Seitz
patent: 4698542 (1987-10-01), Muller
patent: 4701653 (1987-10-01), Merkle et al.
patent: 4739425 (1988-04-01), Dierkes et al.
patent: RE32702 (1988-06-01), Hasler et al.
patent: 4760298 (1988-07-01), Kitahara et al.
patent: 4775906 (1988-10-01), Suzuki et al.
patent: 4797762 (1989-01-01), Levy et al.
patent: 4805055 (1989-02-01), Wright
patent: 4843500 (1989-06-01), Elsaesser et al.
patent: 4905110 (1990-02-01), Krum et al.
patent: 4922406 (1990-05-01), Schuh
patent: 4949000 (1990-08-01), Petersen
patent: 4965476 (1990-10-01), Lin
patent: 4991211 (1991-02-01), Cap et al.
patent: 5001581 (1991-03-01), Elsasser et al.
patent: 5128819 (1992-07-01), Elsaesser et al.
patent: 5132856 (1992-07-01), Takahashi
patent: 5157295 (1992-10-01), Stefansky et al.
patent: 5173814 (1992-12-01), Elsasser et al.
patent: 5216557 (1993-06-01), Elsaesser et al.
patent: RE34412 (1993-10-01), Elsasser et al.
patent: 5256922 (1993-10-01), Tanaka et al.
patent: 5296981 (1994-03-01), Ogawa
patent: 5331483 (1994-07-01), Muller et al.
patent: 5333079 (1994-07-01), Takegami et al.
patent: 5352947 (1994-10-01), MacLeod
patent: 5382853 (1995-01-01), von der Heide et al.
patent: 5400197 (1995-03-01), Jabbari et al.
patent: 5410201 (1995-04-01), Tanaka et al.
patent: 5422769 (1995-06-01), Elsaesser et al.
patent: 5424887 (1995-06-01), Schuh
patent: 5444586 (1995-08-01), Iftikar et al.
patent: 5446610 (1995-08-01), Elsaesser et al.
patent: 5519270 (1996-05-01), Yamada et al.
patent: 5528436 (1996-06-01), Peter
patent: 5548458 (1996-08-01), Pelstring et al.
patent: 5557487 (1996-09-01), Elsaesser et al.
patent: 5596235 (1997-01-01), Yazaki et al.
patent: 5619389 (1997-04-01), Dunfield et al.
patent: 5661351 (1997-08-01), von der Heide et al.
patent: 5708539 (1998-01-01), Schuh
patent: 5729403 (1998-03-01), Schuh
patent: RE35792 (1998-05-01), Elsasser et al.
patent: 5774302 (1998-06-01), Elsaesser et al.
patent: 5777822 (1998-07-01), Schuh
patent: RE36016 (1998-12-01), Cap et al.
patent: 5864443 (1999-01-01), Elsaesser et al.
patent: 5877916 (1999-03-01), Papst
patent: 5880545 (1999-03-01), Takemura et al.
patent: 5907456 (1999-05-01), Khan et al.
patent: 5946161 (1999-08-01), Schuh
patent: 6005746 (1999-12-01), Papst
patent: 654 455 (1986-02-01), None
patent: 2325473 (1974-12-01), None
patent: 2421379 (1975-11-01), None
patent: 2749729 (1979-05-01), None
patent: 3049334 (1981-10-01), None
patent: 3144629 (1982-07-01), None
patent: 3326543 (1985-01-01), None
patent: 0 015 739 (1983-04-01), None
patent: 0 094 484 (1983-11-01), None
patent: 0 098 010 (1984-01-01), None
patent: 0 151 259 (1985-08-01), None
patent: 0 172 459 (1986-02-01), None
patent: 0 172 459 (1986-02-01), None
patent: 0 263 932 (1988-04-01), None
patent: 287 768 (1988-10-01), None
patent: 0291295 (1988-11-01), None
patent: 425 312 (1991-05-01), None
patent: 0 685 843 (1995-12-01), None
patent: 1 328 717 (1973-08-01), None
patent: 1 407 431 (1975-09-01), None
patent: 1 434 192 (1976-05-01), None
patent: 1 486 070 (1977-09-01), None
patent: 1486070 (1977-09-01), None
patent: 1 572 586 (1980-07-01), None
patent: 2075240 (1981-11-01), None
patent: 2 092 834 (1982-08-01), None
patent: 2166586 (1986-05-01), None
patent: 2195812 (1988-04-01), None
patent: 2 218 857 (1989-11-01), None
patent: 53-55
Evans Jefferson
Finnegan Henderson Farabow Garrett & Dunner LLP
Papst Licensing GmbH
LandOfFree
Disk storage device with improved spindle torque and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Disk storage device with improved spindle torque and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk storage device with improved spindle torque and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2955498