US Patent Issued to Western Digital Technologies on Nov. 18 for "Hard disk drive voice coil motor actuator with low-density wire coil and high-density coil stiffener" (Japanese Inventors)

ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,475,921, issued on Nov. 18, was assigned to Western Digital Technologies Inc. (San Jose, Calif.).

"Hard disk drive voice coil motor actuator with low-density wire coil and high-density coil stiffener" was invented by Takehiko Eguchi (Tokyo) and Hajime Eguchi (Fujisawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A voice coil motor assembly (VCMA), such as for a hard disk drive, includes a low-density voice coil and a high-density coil stiffener disposed inside the coil of wire. The low-density voice coil, utilizing copper-clad aluminum or aluminum wire, is configured to increase the second coil torsion mode frequency of the VCMA, thereby bringi...