Foster Electric has filed a patent for a diaphragm for an electroacoustic transducer. The diaphragm is made of a paper substrate containing cellulose fibers and has a first surface region with a higher concentration of coloring particles than the second surface region. GlobalData’s report on Foster Electric 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 Foster Electric, acoustic authentication was a key innovation area identified from patents. Foster Electric'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.
A diaphragm with non-uniform coloring for electroacoustic transducers
A recently filed patent (Publication Number: US20230156420A1) describes a new diaphragm for an electroacoustic transducer. The diaphragm is made of a paper substrate that contains cellulose fibers as the main component. The diaphragm has two surface regions, with the first surface region having a greater total amount of coloring particles compared to the second surface region.
The patent claims that the coloring particles used in the diaphragm have an average particle size of 700 nm or less, and in some embodiments, the average particle size is 400 nm or less. The coloring particles can be carbon black, and the paper substrate can be dyed with a direct dye.
The first surface region of the diaphragm has a thickness of at least one tenth of the overall thickness of the paper substrate. Additionally, the total amount of coloring particles in the first surface region is at least twice as much as in the second surface region.
The patent also includes a method for manufacturing the diaphragm. The method involves impregnating the paper substrate with a coloring dispersion, where coloring particles are dispersed in a solvent. The impregnated paper substrate is then dried in a way that creates a difference in vapor pressure between the first and second surface regions. This results in the first surface region having a greater total amount of coloring particles compared to the second surface region.
The diaphragm described in the patent is specifically designed for use in on-vehicle speakers.
In summary, the patent describes a diaphragm for an electroacoustic transducer made of a paper substrate with cellulose fibers. The diaphragm has two surface regions, with the first surface region containing a greater total amount of coloring particles compared to the second surface region. The patent also includes a method for manufacturing the diaphragm, which involves impregnating the paper substrate with a coloring dispersion and drying it in a way that creates a difference in vapor pressure between the two surface regions. The diaphragm is intended for use in on-vehicle speakers.
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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.
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 across the world’s largest industries.
