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:
Jan. 03, 2012
Filed:
Jun. 25, 2009
Souichi Takigawa, Hamamatsu, JP;
Yoshikatsu Matsubara, Hamamatsu, JP;
Tsuneyasu Demukai, Hamamatsu, JP;
Souichi Takigawa, Hamamatsu, JP;
Yoshikatsu Matsubara, Hamamatsu, JP;
Tsuneyasu Demukai, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu-Shi, JP;
Abstract
An insert earphone device includes an electro-acoustic device, an inserting body, a sound tube connected between the electro-acoustic device and the inserting body and an active valve unit provided on the sound tube, the sound tube is formed with a sound propagation path open at both ends thereof to the electro-acoustic device and the inserting body and an external sound entrance open at both end thereof to environment and the sound propagation path, and the active valve unit is formed of electroactive polymer and responsive to voltage supplied through a cable so as to close and open the external sound entrance; when a user wishes to hear external sound, the user changes the polarity of voltage so that the active valve unit is deformed for conducting the environment to the sound propagation path, whereby the user hears the external sound without removing the earphone device from the ear.