Patent ID: 6069429
Filing Date: 2000-05-30
Classification: F16C,H02K

Abstract:
A spindle motor comprising:a hydrodynamic gas radial bearing having a radial shaft member including a hollow cylinder and fixed to a fixing member, and a radial bearing member fixed to a rotating member and opposed to said radial shaft member in a radial direction of said rotating member; anda hydrodynamic fluid thrust bearing having a thrust shaft member fixed to said fixing member and a thrust bearing member fixed to said rotating member and disposed inside the hollow cylinder, and including a magnetic-fluid retaining mechanism for retaining a magnetic fluid located on an inner surface of the hollow cylinder of a portion of said thrust bearing member, said thrust shaft member and said thrust bearing member being opposed to each other in an axial direction of said rotating member, wherein opposing surfaces of said thrust shaft member and said thrust bearing member of said hydrodynamic fluid thrust bearing are arranged within a bearing-functional-dimension region of said hydrodynamic gas radial bearing.