US 12,137,311 B2
Earphone with duct unit dividing pressure equilibrium hole and back hole
Jun Hee Han, Gyeongsangnam-do (KR); Yong Ju Ji, Gyeongsangnam-do (KR); and Young Seok Noh, Gyeongsangnam-do (KR)
Assigned to EM-TECH Co., Ltd., Gyeongsangnam-do (KR)
Filed by EM-TECH Co., Ltd., Gyeongsangnam-do (KR)
Filed on Apr. 7, 2022, as Appl. No. 17/715,537.
Claims priority of application No. 1020210046547 (KR), filed on Apr. 9, 2021.
Prior Publication US 2022/0329926 A1, Oct. 13, 2022
Int. Cl. H04R 1/10 (2006.01); H04R 1/28 (2006.01); H04R 9/02 (2006.01)
CPC H04R 1/1016 (2013.01) [H04R 1/2869 (2013.01); H04R 9/025 (2013.01); H04R 2460/11 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An earphone with a duct unit dividing a pressure equilibrium hole and a back hole, the earphone comprising:
a driver unit including a frame, a magnetic circuit, a voice coil, a diaphragm configured to reproduce sound, a pressure equilibrium hole configured to improve a pressure difference between front and rear sides of the driver unit, and a back hole configured to smooth vibration of the diaphragm;
a housing allowing the driver unit to be installed therein and including a vent hole; and
a duct unit provided in the housing, adjusting a size of a back volume in the housing, and providing a flow path from the pressure equilibrium hole to the vent hole,
wherein the duct unit separately divides the flow path from the pressure equilibrium hole to the vent hole and a flow path from a back hole to the vent hole.