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:
Dec. 13, 2005
Filed:
Feb. 13, 2002
Heinz Renner, Kaltenleutgeben, AT;
Heinz Renner, Kaltenleutgeben, AT;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A transducer () includes a transducer axis (), a membrane (), a magnet system () having an outer magnet system part () and an inner magnet system part (), a moving coil configuration () connected to the membrane () and having a coil carrier () and a moving coil () held by the coil carrier () in an air gap () between the two magnet system parts (), and guides () for rectilinearly guiding the moving coil configuration () parallel to the transducer axis (). The moving coil configuration () has a cylindrical boundary surface () which, together with a cylindrical boundary surface () of the outer magnet system part (), delimits a cylindrical gap () which is acoustically impermeable above a lower limit frequency of at most 100 Hz.