# US 2025/0386133 A1 · Coaxial Speaker > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0386133 A1 - Document ID: US20250386133A1 - Status: Published application - Kind: A1 - Application number: 17/913,833 - Filed: 2022-07-20 - Published: 2025-12-18 - Earliest claimed: 2022-06-30 - Assignees: AAC Microtech (Changzhou) Co., Ltd. - Applicants: AAC Microtech (Changzhou) Co., Ltd. - Inventors: Zhang Ren; Qi Wang; Zhiwei Zhong - Web page: https://patentgrep.com/patent/US20250386133A1 ## CPC - H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges - H04R 1/22: for obtaining desired frequency characteristic only {(circuit for combining transducers having different responses H04R3/00; for hearing aids H04R25/407)} - H04R 7/04: Plane diaphragms - H04R 7/18: at the periphery - H04R 9/02: Details - H04R 9/025: {Magnetic circuit} - H04R 9/046: {Construction} - H04R 9/06: Loudspeakers - H04R 9/063: {using a plurality of acoustic drivers (H04R1/24 and H04R1/403 take precedence)} - H04R 2400/11: Aspects regarding the frame of loudspeaker transducers - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A coaxial speaker is provided, including a first sounding unit, a second sounding unit coaxial with and surrounded by the first sounding unit, and a magnetic circuit system including a first magnetic unit and a second magnetic unit spaced apart from the first magnetic unit for forming a first magnetic gap for the first sounding unit. The second magnetic unit includes a second magnet, a second yoke attached to the second magnet, a third magnet attached to the second yoke, and a third yoke attached to the third magnet. The second yoke includes an annular plate sandwiched between the second magnet and the third magnet, and a bending portion. The third magnet and the third yoke are spaced apart from the bending portion for forming a second magnetic gap for the second sounding unit. The coaxial speaker reduces a product height and a magnetic circuit system cost. ## Claims ### Claim 1 A coaxial speaker, comprising: a magnetic circuit system comprising: a bottom plate; a first magnetic unit comprising a first magnet disposed on the bottom plate and a first yoke attached to the first magnet; and a second magnetic unit arranged on an inner side of the first magnetic unit and spaced apart from the first magnetic unit for forming a first magnetic gap, comprising a second magnet in an annular shape disposed on the bottom plate, a second yoke attached to the second magnet, a third magnet in an annular shape attached to the second yoke, and a third yoke attached to the third magnet, wherein the second yoke comprises an annular plate sandwiched between the second magnet and the third magnet, and a bending portion bent and extending from an inner edge of the annular plate in a direction away from the second magnet, the third magnet and the third yoke are spaced apart from the bending portion for forming a second magnetic gap; a first sounding unit comprising a first diaphragm and a first voice coil locating in the first magnetic gap and driving the first diaphragm for vibrating and emitting sounds; and a second sounding unit coaxial with and surrounded by the first sounding unit, comprising a second diaphragm and a second voice coil locating in the second magnetic gap and driving the second diaphragm for vibrating and emitting sounds. ### Claim 2 (depends on 1) The coaxial speaker as described in claim 1, further comprising a first frame for supporting the first diaphragm and a second frame for supporting the second diaphragm, wherein an outer fixing part of the first diaphragm is fixed to the first frame, an inner fixing part of the first diaphragm is fixed to the third magnet, the second frame is fixed to the third magnet. ### Claim 3 (depends on 2) The coaxial speaker as described in claim 2, wherein the first yoke comprises a main body part attached to a surface of the first magnet and an extension part extending from the main body part in a direction away from the second magnetic unit, the first frame is fixed to the extension part. ### Claim 4 (depends on 3) The coaxial speaker as described in claim 3, wherein the first sounding unit further comprises an elastic supporting member opposite to and spaced apart from the first diaphragm, and a skeleton connected between the first diaphragm and the elastic supporting member, an amount of the extension parts is two, the two extension parts are respectively arranged on two opposite long-axis sides of the coaxial speaker, an amount of the elastic supporting members is two, the two elastic supporting members are respectively arranged on two opposite short-axis sides of the coaxial speaker, the skeleton comprises two supporting arms respectively fixed to the two elastic supporting members, each supporting arm is arranged between the first frame and the first magnetic unit, an outer fixing portion of each elastic supporting member is fixed to the first frame, an inner fixing portion of each elastic supporting member is fixed to a corresponding one of the two supporting arms. ### Claim 5 (depends on 4) The coaxial speaker as described in claim 4, wherein each elastic supporting member comprises a flexible printed circuit board fixed to a corresponding one of the two supporting arms and an auxiliary diaphragm fixed to a bottom surface of the flexible printed circuit board away from the first diaphragm. ### Claim 6 (depends on 2) The coaxial speaker as described in claim 2, wherein the second frame comprises an inner surface and an outer surface opposite to the inner surface, the third yoke abuts against the inner surface, the inner fixing part of the first diaphragm abuts against the outer surface.