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:
Feb. 22, 2008
Erkki Honkakoski, Sastamala, FI;
Antti Kelloniemi, Helsinki, FI;
Heini Orhala, Sastamala, FI;
Pasi Peltola, Tampere, FI;
Sari Tuominen, Suodenniemi, FI;
Erkki Honkakoski, Sastamala, FI;
Antti Kelloniemi, Helsinki, FI;
Heini Orhala, Sastamala, FI;
Pasi Peltola, Tampere, FI;
Sari Tuominen, Suodenniemi, FI;
PANPHONICS OY, Espoo, FI;
Abstract
Acoustic actuator plate structures are used in acoustic applications. The acoustic actuator plate structure according to the invention contains an electret material and comprises a structurally weaker electret layer (), where the specific resistance of the electret material is at least 10 Ωm and the yield point of it is high, and a structurally stronger support structure layer (), where the plastic region of the support layer material is wider than the plastic region of the electret material. The electret layer () can be formed of a material that retains its electret properties extremely well even in high temperatures and humid conditions. This material may be brittle. The support structure layer () provides mechanical and structural strength to the acoustic actuator plate structure.