The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2021
Filed:
Sep. 22, 2020
Hyundai Motor Company, Seoul, KR;
Kia Motors Corporation, Seoul, KR;
Youngbeom Kim, Gyeonggi-do, KR;
Hyundai Motor Company, Seoul, KR;
Kia Motors Corporation, Seoul, KR;
Abstract
A vibration speaker includes: a housing; a diaphragm covering an open side of the housing and having a rim fixed to the housing; a vibration member installed in the housing to vibrate in a vibration direction of the diaphragm and having a magnet forming a magnetic field; a voice coil installed on an inner surface of the diaphragm and configured to vibrate the diaphragm through interaction with the vibration member; a solenoid driver fixed in the housing and configured to form the magnetic field that controls vibration of the vibration member; an amplifier configured to apply a first output signal to the voice coil and apply a second output signal having a phase different from the first output signal to the solenoid driver; and a controller configured to determine whether to apply the second output signal by comparing a frequency of the first output signal with the resonance frequency.