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:
Jan. 23, 1996
Filed:
Sep. 07, 1994
Shigemasa Saito, Kanagawa, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
A disk storage device includes a fixed information storage disk that is free from deformation, has a wide effective data storage area and shows excellent anti-mechanical shock properties. Specifically, a disk hole of the information storage disk is fit to a hub coupled to a rotary shaft of a spindle motor until the disk contacts with a flange face of the hub. The spindle motor and the disk are then sandwiched by a lower electrode which contacts with the bottom surface of the spindle motor and an upper electrode which contacts with the upper surface of the disk. A DC power supply applies positive potential to the hub via the lower electrode and the casing of the spindle motor and negative potential to the disk via the upper electrode. An electrostatic junction portion is formed between the bottom face of the disk and the flange face of the hub, thereby securing the disk tightly to the hub.