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:
Aug. 23, 2022
Filed:
Dec. 09, 2020
Kaizhong Gao, North Oaks, MN (US);
Kaizhong Gao, North Oaks, MN (US);
Other;
Abstract
A hard disk drive includes a drive case and a cover plate, the storage media platers and a spindle, the recording heads and actuators, the connection port, the control logic board and one or more voice coil motor, where the actuators are operated via a voice coil motor; wherein the voice coil motor magnets comprise of a pair of composite permanent magnets on both sides of the voice coil, where each piece of composite permanent magnet comprising: a first core magnet M, a cladding magnet Mcand a second core magnet M; the magnetization direction of Mand Mare opposite to each other; the magnetization direction of Mcis substantially perpendicular to the magnetization direction of Mand M; the ratio of the width of Mcto the thickness or the height of Mcis 4:1 or less as seen from the back view.