US 12,238,498 B2
Bone conduction speaker
Lei Zhang, Shenzhen (CN); Fengyun Liao, Shenzhen (CN); and Xin Qi, Shenzhen (CN)
Assigned to SHENZHEN SHOKZ CO., LTD., Shenzhen (CN)
Filed by SHENZHEN SHOKZ CO., LTD., Guangdong (CN)
Filed on Aug. 18, 2023, as Appl. No. 18/452,080.
Application 18/452,080 is a continuation of application No. 17/453,643, filed on Nov. 4, 2021, granted, now 11,778,384.
Application 17/453,643 is a continuation of application No. 17/170,897, filed on Feb. 9, 2021, granted, now 11,197,100, issued on Dec. 7, 2021.
Application 17/170,897 is a continuation of application No. 16/923,015, filed on Jul. 7, 2020, granted, now 11,310,602, issued on Apr. 19, 2022.
Application 16/923,015 is a continuation of application No. PCT/CN2018/104934, filed on Sep. 11, 2018.
Claims priority of application No. PCT/CN2018/071751 (WO), filed on Jan. 8, 2018.
Prior Publication US 2023/0396928 A1, Dec. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 9/02 (2006.01); H01F 7/08 (2006.01); H01F 7/121 (2006.01); H04R 1/10 (2006.01); H04R 9/06 (2006.01)
CPC H04R 9/025 (2013.01) [H01F 7/081 (2013.01); H01F 7/121 (2013.01); H04R 1/1091 (2013.01); H04R 9/06 (2013.01); H04R 2460/13 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic circuit assembly of a bone conduction speaker, wherein the magnetic circuit assembly generates a first magnetic field, and the magnetic circuit assembly includes:
a first magnetic element generating a second magnetic field;
a first magnetic guide element configured to adjust a distribution of the second magnetic field, a lower surface of the first magnetic guide element being connected with an upper surface of the first magnetic element;
a second magnetic guide element configured to adjust the distribution of the second magnetic field, at least a portion of the second magnetic guide element being configured to surround the first magnetic element and a magnetic gap being configured between the second magnetic guide element and the first magnetic element; and
at least one second magnetic element connected with an upper surface of the first magnetic guide element, wherein the at least one second magnetic element generates a third magnetic field.