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:
Mar. 29, 2016
Filed:
Apr. 14, 2014
Knowles Electronics, Llc, Itasca, IL (US);
Kurt B. Friel, Sycamore, IL (US);
John B. Szczech, Schaumburg, IL (US);
Knowles Electronics, LLC, Itasca, IL (US);
Abstract
An acoustic apparatus includes a substrate, micro electro mechanical system (MEMS) die, and an integrated circuit. The substrate includes a permanent opening that extends there through. The micro electro mechanical system (MEMS) die is disposed over the permanent opening and the MEMS die includes a pierce-less diaphragm that is moved by sound energy. A first temporary opening extends through the substrate. The integrated circuit is disposed on the substrate and includes a second opening. The first temporary opening and the second opening are generally aligned. A cover that is coupled to the substrate and encloses the MEMS die and the integrated circuit. The cover and the substrate form a back volume, and the diaphragm separates the back volume from a front volume. The first temporary opening is unrestricted at a first point in time to allow gasses present in the back volume to exit through the temporary opening to the exterior and the pierce-less diaphragm prevents the gasses from passing there through. The first temporary opening is later substantially filled and closed at a second point in time, after which the acoustic device becomes operational.