Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Spindle motor and rotation device having dynamic pressure bearing










Image Number 3 for United States Patent #7531928.

A spindle motor includes a shaft including a core spindle member with a large and a small diameter portions and an encircling annulus member attached to the small diameter portion; a rotor hub attached to the large diameter portion; a bearing member; a radial bearing portion provided with first dynamic pressure creating grooves and formed between the outer peripheral surface of the encircling annulus member and the inner peripheral surface of the bearing member; a thrust bearing portion provided with second dynamic pressure creating grooves and formed between a lower end of the encircling annulus member and the bottom of the bearing member; a first opening formed at a radially inner side of the thrust bearing portion; a second opening formed at a radially outer side of the large diameter portion; and a communication hole continuously formed from the first opening to the second opening.








 
 
  Recently Added Patents
Fabric care compositions comprising front-end stability agents
Low cost mesh network capability
Area reduction for surface mount package chips
Magnifying glass
Compound containing a carbon or an oxygen isotope, preparation and use thereof, and composition comprising thereof
System and method for self service marketing research
Method and apparatus for belling plastic pipe
  Randomly Featured Patents
Apparatus for the operation of a robot
Multi-way valve
Synchronizing circuit including two flip-flops and circuit means to protect a synchronized signal from an unstable state of the flip-flops
Electrical connector with an anti-dust device to avoid the poor contact from dust
Mammalian CX.sub.3C chemokine antibodies
High resolution frequency calibrator for sleep mode clock in wireless communications mobile station
Digital clock
Method and device for piloting an aircraft
Miniature switch with substantial wiping action
Method and apparatus for detecting abnormal characteristic values capable of suppressing detection of normal characteristic values