公开(公告)号：US12052549B2

公开(公告)日：2024-07-30

申请号：US17656026

申请日：2022-03-23

Applicant: ALPS ALPINE CO., LTD.

Inventor： Ryosuke Tachi ,  Masashi Kaneko ,  Tadashi Sakashita ,  Arata Tada

IPC: H04R29/00 ,  H04R7/12 ,  H04R9/02 ,  H04R9/04 ,  H04R9/06

CPC classification number: H04R29/001 ,  H04R7/12 ,  H04R9/025 ,  H04R9/046 ,  H04R9/06

Abstract: A speaker includes a yoke configured to form a magnetic circuit, a first magnet provided in a fixed manner, a voice coil provided in a gap through which a magnetic flux of the magnetic circuit is configured to pass, a diaphragm connected to the voice coil and configured to vibrate with the voice coil, a second magnet provided on a diaphragm unit including the voice coil and the diaphragm, and a magnetic sensor provided at a position through which both of a first magnetic flux generated by the first magnet and a second magnetic flux generated by the second magnet are configured to pass, wherein a direction of the first magnetic flux and a direction of the second magnetic flux are different from each other.