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:
Sep. 24, 2013
Filed:
Nov. 30, 2009
Fumihito Meguro, Tokyo, JP;
Tomomi Nakatsuka, Tokyo, JP;
Masashi Hori, Tokyo, JP;
Hiromi Sotome, Tokyo, JP;
Masahiro Iwata, Tokyo, JP;
Kuniyuki Kobayashi, Tokyo, JP;
Fumihito Meguro, Tokyo, JP;
Tomomi Nakatsuka, Tokyo, JP;
Masashi Hori, Tokyo, JP;
Hiromi Sotome, Tokyo, JP;
Masahiro Iwata, Tokyo, JP;
Kuniyuki Kobayashi, Tokyo, JP;
FPS Inc., Tokyo, JP;
Abstract
A flat acoustic transducer () includes a permanent magnet () and a magnetic member (), which are arranged adjacent to each other with a predetermined interval, a flat vibrating membrane (), provided facing the permanent magnet () and the magnetic member (), and at least one coil (), fixed to the vibrating membrane (). In the flat acoustic transducer (), an electrical signal is applied to the coil (), to obtain vibration force (F) on the vibrating membrane () by way of a magnetic flux Φ generated between a magnetic pole face () of the permanent magnet () and the magnetic member (), a step () is provided between the magnetic pole face () and the upper face () of the magnetic member (), while at least part of a winding () of the coil () at the time of no application of an electrical signal is arranged inside the step ().