Energy Focus has filed a patent for a microphone assembly that includes a housing with an acoustic cavity and a sound inlet. The assembly also includes a micro-electro-mechanical (MEMS) microphone located within the housing, along with an adjustable support for the microphone. An acoustic vent is positioned between the acoustic cavity and the microphone aperture to allow sound to pass through while preventing foreign contaminants from entering. GlobalData’s report on Energy Focus gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData's company profile on Energy Focus, smart lighting was a key innovation area identified from patents. Energy Focus's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.

Microphone assembly with adjustable support and acoustic vent

Source: United States Patent and Trademark Office (USPTO). Credit: Energy Focus Inc

A recently filed patent (Publication Number: US20230146074A1) describes a microphone assembly with various features and components. The assembly includes a microphone housing that defines an acoustic cavity and has a sound inlet for transmitting sound into the cavity. A micro-electro-mechanical (MEMS) microphone is mounted at least partially within the housing and has an aperture that is acoustically coupled with the cavity to receive sound. The assembly also includes a movable MEMS microphone support that is adjustably coupled to the housing and supports the MEMS microphone. An acoustic vent is located between the cavity and the aperture of the MEMS microphone, and it is sealingly mounted to the aperture.

The patent claims also mention that the microphone assembly is compliant with the IEC 61672 Class 2 standard. The movement of the MEMS microphone support allows for the variation of the size of the acoustic cavity. The microphone housing and the MEMS microphone support are generally cylindrical and coaxially aligned. A lock ring is adjustably mounted to the housing to secure the MEMS microphone within it. The housing has a closed end with a housing aperture and a housing acoustic vent adjacent to it. A sealing gasket is positioned between the closed end and the MEMS microphone. Additionally, there is an acoustic tuning material adjacent to the closed end of the housing, with a sealing gasket positioned between the tuning material and the MEMS microphone.

Another embodiment of the microphone assembly described in the patent includes a housing with an aperture and a MEMS microphone located partially within the housing. The MEMS microphone has a microphone aperture that is acoustically coupled with the housing aperture. An acoustic vent is placed adjacent to the microphone aperture to allow sound to pass through while preventing foreign contaminants from entering. The assembly also includes a microphone support mounted to the housing and supporting the MEMS microphone. A lock ring couples the MEMS microphone to the housing. An acoustic tuning material is positioned between the housing and the MEMS microphone, with a sealing gasket between the tuning material and the MEMS microphone. There is also a second acoustic vent adjacent to the housing aperture.

Lastly, the patent describes a microphone assembly with microphone means for detecting sound, housing means for supporting the microphone means, and acoustic venting means located between the housing means and the microphone means. The venting means allows sound to pass through while preventing foreign contaminants from reaching the microphone means. The assembly may also include support means for securing the microphone means to the housing means, an acoustic tuning material between the housing means and the microphone means, and a second acoustic venting means distally located from the first venting means.

Overall, the patent describes various configurations and components of a microphone assembly that aim to improve sound transmission and prevent contamination.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies