公开(公告)号：US10897004B2

公开(公告)日：2021-01-19

申请号：US15695485

申请日：2017-09-05

Applicant: TDK CORPORATION

Inventor： Mitsunao Homma ,  Masahiro Hosokawa

IPC: H01L41/09 ,  H01L41/083 ,  B60J1/17 ,  E05F15/60 ,  G02B7/08 ,  H01L41/047 ,  H01L41/04 ,  H02N2/00 ,  H02N2/02

Abstract: A piezoelectric drive device including: laminated piezoelectric element including a first end face and a second end face opposed to the first end face; a weight member attached to the first end face; and a shaft attached to the second end face, in which a moving member, engaged to the shaft movable in an axial direction, is moved by activating the laminated piezoelectric element. Inside the laminated piezoelectric element, a first internal electrode and a second internal electrode, respectively having a plane surface approximately perpendicular to the first end face and the second end face, are laminated in Y axial direction, approximately perpendicular to the first internal electrode and the second internal electrode with a piezoelectric layer in-between. The piezoelectric drive device, in which the laminated piezoelectric element is difficult to bend, even when the load is applied to the shaft from a lateral direction, is provided.

公开(公告)号：US09755134B2

公开(公告)日：2017-09-05

申请号：US14182589

申请日：2014-02-18

Applicant: TDK CORPORATION

Inventor： Ryuta Motani ,  Kazuo Nagata ,  Mitsunao Homma

IPC: H01L41/047 ,  G11B5/48 ,  H01L41/04

CPC classification number: H01L41/047 ,  G11B5/4873 ,  H01L41/04

Abstract: In a piezoelectric device, an identification pattern provided on a main face of a piezoelectric body is covered with an electrode, so as to inhibit the identification pattern from generating particles, while the identification pattern makes the polarity of the piezoelectric device discernible by the appearance thereof.

公开(公告)号：US10514522B2

公开(公告)日：2019-12-24

申请号：US15640671

申请日：2017-07-03

Applicant: TDK CORPORATION

Inventor： Masahiro Hosokawa ,  Naoki Yusa ,  Seiji Fukuoka ,  Mio Hamashima ,  Toshiki Maruyama ,  Hiroshi Tojo ,  Mitsunao Homma ,  Takuto Horii ,  Atsushi Ezawa ,  Tatsuya Taki

IPC: G02B7/02 ,  H02N2/04

Abstract: A lens drive unit that prevents an actuator from being inclined is provided. In the lens drive unit, when a lens frame is displaced in a direction orthogonal to a direction in which the actuator extends and contracts with respect to a base member by, for example, impact from an outside of the lens drive unit, a drive shaft of the actuator abuts on a first lateral wall and a column, so that the actuator is prevented from being inclined with respect to the base member.

公开(公告)号：US10429606B2

公开(公告)日：2019-10-01

申请号：US15642090

申请日：2017-07-05

Applicant: TDK CORPORATION

Inventor： Toshiki Maruyama ,  Naoki Yusa ,  Seiji Fukuoka ,  Masahiro Hosokawa ,  Mio Hamashima ,  Hiroshi Tojo ,  Mitsunao Homma ,  Takuto Horii ,  Atsushi Ezawa ,  Tatsuya Taki

IPC: G02B7/02 ,  H02N2/04

Abstract: A lens drive unit that offers enhanced reliability in connection between an actuator electrode and an electric wire is provided. In the lens drive unit, an actuator has a weight housed in an holding portion of a base member and is thereby fixed in the base member. Electrodes on a lateral surface of the weight directly contact respective terminal electrodes on an inner lateral surface of the holding portion, so that an electrical connection is established therebetween. The arrangement enhances reliability in connection between the actuator electrodes and the terminal electrodes.