公开(公告)号：US12177626B2

公开(公告)日：2024-12-24

申请号：US17967565

申请日：2022-10-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Satoshi Itoh ,  Mitsukazu Kuze ,  Shinya Kagawa ,  Kiyohisa Hattori

IPC: H04R1/24 ,  H04R3/00 ,  H04R7/12 ,  H04R9/02 ,  H04R9/04 ,  H04R9/06

Abstract: An electroacoustic conversion device includes a vibration plate, an inner voice coil attached to the vibration plate, an outer voice coil attached to the vibration plate outside the inner voice coil to surround the inner voice coil, a magnet, a yoke, and the frame which holds the vibration plate and the yoke. The magnet includes a wiring portion which is in a form of a through hole or a notch in which inner signal lines for the inner voice coil are provided.

公开(公告)号：US11218812B2

公开(公告)日：2022-01-04

申请号：US16825547

申请日：2020-03-20

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Shinya Kagawa ,  Mitsukazu Kuze

IPC: H04R9/06 ,  H04R9/02

Abstract: A speaker device that includes: two magnetic circuits arranged side by side and each including a magnetic gap; two voice coil bodies each corresponding to a shape of the magnetic gap and arranged in the magnetic gap in an inserted state; a diaphragm to which the two voice coil bodies are coupled, the diaphragm having a width shorter than a length in a direction in which the two magnetic circuits are arranged; and a frame to which the diaphragm and the two magnetic circuits are attached. In the speaker device, the two voice coil bodies include two coils connected in series, the two coils being connected to a pair of input terminals for receiving an input of an electric signal, the pair of input terminals being disposed between the two voice coil bodies.