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:
May. 27, 1986
Filed:
Feb. 28, 1985
Onkyo Kabushiki Kaisha, Osaka, JP;
Abstract
A structure for a dome speaker includes a dome-shaped diaphragm formed of a high rigidity material and having an outer periphery, a voice coil bobbin secured at a top end thereof to the outer periphery of the diaphragm, a voice coil mounted about the bobbin, and a variation means in the bobbin for varying the resonance conditions of the diaphragm. The variation means includes at least one cut-out portion provided at the top end of the bobbin and a sheet which closes the cut-out portion. Preferably, the diaphragm is made of a nitrified titanium alloy and the sheet is made from a material softer than the bobbin. The cut-out portion may have a width from about 7 to about 50 percent of the total circumferential length of the bobbin.