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:
Jul. 16, 1996
Filed:
Jul. 25, 1994
John L Janning, Dayton, OH (US);
JLJ, Inc., Dayton, OH (US);
Jay Cavender, Inc., Springboro, OH (US);
Abstract
A magnetic and variable-volume sound producing device which comprises a housing member, a substantially planar acoustic-producing diaphragm supported along its peripheral edge by the housing, a spiral, multi-turn and electrically conductive coil fixedly secured to the diaphragm and adapted to be energized by an alternating voltage having a frequency within the range of approximately 100 Hz to 15,000 Hz to thereby cause the diaphragm to vibrate at a frequency determined by the applied alternating voltage in the presence of a magnetic field. A volume control permanent magnet is slidably mounted within the housing along a fixed predetermined path with respect to the coil and is connected to a manually operable lever means to be fixedly position at a predetermined physical location with respect to the coil along the predetermined path, whereby the volume of the audio output signal is determined by the physical position of the permanent magnet.