US 11,869,543 B2
Disk device with heat dissipation layer to suppress excessive heating
Kota Tokuda, Fujisawa Kanagawa (JP); Nobuhiro Yamamoto, Yokohama Kanagawa (JP); Taichi Okano, Yokohama Kanagawa (JP); Yoshihiro Amemiya, Chigasaki Kanagawa (JP); and Shinra Yamanaka, Yokohama Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Electronic Devices & Storage Corporation, Tokyo (JP)
Filed on Sep. 12, 2022, as Appl. No. 17/942,439.
Claims priority of application No. 2021-211073 (JP), filed on Dec. 24, 2021.
Prior Publication US 2023/0206957 A1, Jun. 29, 2023
Int. Cl. G11B 33/12 (2006.01); H05K 1/11 (2006.01); G06F 3/06 (2006.01); G11B 5/54 (2006.01); G11B 33/02 (2006.01)
CPC G11B 33/122 (2013.01) [G06F 3/0676 (2013.01); G11B 5/54 (2013.01); H05K 1/118 (2013.01); G11B 33/022 (2013.01); G11B 2220/2516 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A disk device comprising:
a magnetic disk;
a magnetic head configured to read and write information from and to the magnetic disk;
a first flexible printed circuit board including a plurality of first terminals, on which the magnetic head is mounted and electrically connected to at least one of the plurality of first terminals;
a second flexible printed circuit board including
a surface,
a plurality of second terminals on the surface, individually bonded to the corresponding first terminals with a conductive bonding material, and
a first ground plane covering at least one of the plurality of second terminals in a direction orthogonal to the surface; and
a preamplifier mounted on the second flexible printed circuit board, configured to
output, to the magnetic head, an electric signal representing information to be written to the magnetic disk by the magnetic head, and
receive, from the magnetic head, an electric signal representing information read from the magnetic disk by the magnetic head,
wherein
the plurality of second terminals includes a first read terminal through which an electric signal representing information read from the magnetic disk by the magnetic head passes,
the first ground plane is located apart from at least a part of the first read terminal in a direction along the surface,
the second flexible printed circuit board includes a second read terminal connected to the preamplifier, and lead wiring connecting the first read terminal and the second read terminal,
the first ground plane is provided with a hole, and
the first read terminal, the lead wiring, and the second read terminal are at least partially located inside an edge of the hole in the direction along the surface.