The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 1988
Filed:
Apr. 18, 1986
Masami Suzuki, Odawara, JP;
Hiroshi Nishida, Kanagawa, JP;
Tsuyoshi Takahashi, Odawara, JP;
Mikio Higashi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic disk drive apparatus has a spindle holding mechanism for a spindle that supports a plurality of magnetic disks. The spindle is rotatably supported on a base by two bearings. Each bearing is pressed by a compressive coil spring to the base in the direction parallel with the plane of the magnetic disks and perpendicular to the axial direction of the spindle. Additionally, one of the bearings is affected with a pressing force in the axial direction of the spindle by another compressive coil spring. Therefore, even if the bearings have a thermal expansion coefficient different from that of the base, the thermal expansion can be absorbed by the compressive coil springs thereby preventing a generation of thermal stress between the parts. Consequently, deflection in relative position between the two bearings is prevented, and an inclination of the spindle is avoided.