# US 12,192,726 B2 · Speaker > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,726 B2 - Document ID: US12192726B2 - Status: Granted - Kind: B2 - Application number: 17/822,434 - Filed: 2022-08-26 - Published: 2023-07-06 - Granted: 2025-01-07 - Earliest claimed: 2021-12-30 - Assignees: Tiinlab Corporation - Applicants: Tiinlab Corporation - Inventors: Xiaochao Gong; Shihchia Chiu; Xiaolin Deng - Web page: https://patentgrep.com/patent/US12192726B2 ## CPC - H04R 9/025: {Magnetic circuit} - H04R 9/06: Loudspeakers - H04R 2209/022: Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils - 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 speaker includes a vibration diaphragm, a voice coil, a first magnet, and a second magnet. Each of the first and second magnets includes an end adjacent to the voice coil and an end distant from the voice coil, of which magnetic polarities are opposite to each other. The ends of the first magnet and the second magnet that are adjacent to the voice coil are of opposite magnetic polarities. The voice coil is partly aligned with a gap between the first magnet and the second magnet. A portion of the voice coil is located between the end surfaces of the first and second magnets that exhibit a height difference. Due to the height difference, a path of the magnetic lines of force is shortened and the magnetic flux density in an area around the voice coil is thus increased, thereby increasing the BL value of electromechanical coupling factor. ## Claims ### Claim 1 A speaker, comprising: a vibration diaphragm; a voice coil connected to the vibration diaphragm; a first magnet comprising an end adjacent to the voice coil and an opposite end distant from the voice coil, of which magnetic polarities are opposite to each other; and a second magnet comprising an end adjacent to the voice coil and an opposite end distant from the voice coil, of which magnetic polarities are opposite to each other; wherein the voice coil has an effective width that is greater than a magnetic gap between the first magnet and the second magnet, at least a portion of the voice coil is arranged to align with the gap between the first magnet and the second magnet; the ends of the first magnet and the second magnet that are adjacent to the voice coil are of opposite magnetic polarities; and the first magnet and the second magnet exhibit a height difference between end surfaces thereof on a same side, and at least a portion of the voice coil is located between the end surface of the first magnet and the end surface of the second magnet that exhibit the height difference. ### Claim 2 (depends on 1) The speaker according to claim 1, wherein the height difference between the first magnet and the second magnet is greater than a thickness of the voice coil. ### Claim 3 (depends on 1) The speaker according to claim 1, wherein one of the first magnet and the second magnet that is relatively high has a magnet height that is less than 1.25 times of a magnet height of one of the first magnet and the second magnet that is relatively low. ### Claim 4 (depends on 1) The speaker according to claim 1, wherein an avoidance notch is formed in the first magnet and/or the second magnet, and a portion of the voice coil is located at a site of the avoidance notch. ### Claim 5 (depends on 1) The speaker according to claim 1, wherein a distance between a bottom surface of the voice coil and one of the first magnet and the second magnet that is relatively low is greater than a vibration amplitude of the voice coil, and a distance between a bottom surface of the vibration diaphragm and one of the first magnet and the second magnet that is relatively high is greater than the vibration amplitude of the voice coil. ### Claim 6 (depends on 1) The speaker according to claim 1, wherein the first magnet comprises a first external magnet that is of a ring-shape, the second magnet comprises a first internal magnet, and the first external magnet surrounds the first internal magnet. ### Claim 7 (depends on 6) The speaker according to claim 6, wherein a hollow channel is formed in the first external magnet and communicates between outside and inside surfaces of the first external magnet, and the hollow channel communicates between a rear compartment of the speaker and an outside space. ### Claim 8 (depends on 6) The speaker according to claim 6, wherein the speaker further comprises a second external magnet that is arranged opposite to the first external magnet, and a second internal magnet that is arranged opposite to the first internal magnet, and ends of the second external magnet and the first external magnet that correspond to each other have a same magnetic polarity, and ends of the second internal magnet and the first internal magnet that correspond to each other have a same magnetic polarity, and ends of the second external magnet and the second internal magnet that are on a same side have opposite magnetic polarities. ### Claim 9 (depends on 8) The speaker according to claim 8, wherein a structure of the second external magnet is identical to a structure of the first external magnet, and/or a structure of the second internal magnet is identical to a structure of the first internal magnet. ### Claim 10 (depends on 7) The speaker according to claim 7, wherein a height difference is formed between end surfaces of the first external magnet and the first internal magnet that are adjacent to the voice coil, a height difference is formed between end surfaces of the second external magnet and the second internal magnet that are adjacent to the voice coil. ### Claim 11 (depends on 10) The speaker according to claim 10, wherein at least a portion of the voice coil is located between the end surface of the first external magnet and the end surface of the first internal magnet between which the height difference is formed; and/or, at least a portion of the voice coil is located between the end surface of the second external magnet and the end surface of the second internal magnet between which the height difference is formed. ### Claim 12 (depends on 10) The speaker according to claim 10, wherein the second external magnet is provided, on a portion thereof that corresponds to the vibration diaphragm, an inward recessed portion, which corresponds, in shape, to a bent ring of the diaphragm film, and the inward recessed portion is recessed in a direction that is parallel to a direction in which the bent ring of the vibration diaphragm protrudes.