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:
Apr. 17, 2012
Filed:
Mar. 23, 2004
Toru Inoue, Anjyo, JP;
Masaki Ishikawa, Anjyo, JP;
Youhei Ishikawa, Anjyo, JP;
Sohei Matsuyama, Nukata-gun, JP;
Hideyuki Mori, Inuyama, JP;
Toru Inoue, Anjyo, JP;
Masaki Ishikawa, Anjyo, JP;
Youhei Ishikawa, Anjyo, JP;
Sohei Matsuyama, Nukata-gun, JP;
Hideyuki Mori, Inuyama, JP;
Takehiro Co., Ltd., Anjyo-shi, JP;
Toyota Boshoku Corporation, Kariya-shi, JP;
Abstract
A sound insulator of the invention includes a sound absorption layerand an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layerhas a thickness in a range of 5 to 50 mm and an area-weight of not greater than 2000 g/m. The sound absorption layerhas a two-layer structure of a high-density sound absorption layerand a low-density sound absorption layer, which have different densities. The high-density sound absorption layeris bonded to the air-impermeable resonance layervia the adhesive layerand has a density in a range of 0.05 to 0.20 g/cmand a thickness in a range of 2 to 30 mm. The low-density sound absorption layeris bonded to the other face of the high-density sound absorption layer, which is opposite to the air-impermeable resonance layer, via an adhesive layerand has a density in a range of 0.01 to 0.10 g/cmand a thickness in a range of 2 to 30 mm. The structure of this sound insulator effectively reduces a noise level in a voice-tone frequency band, especially in a high frequency domain, thereby efficiently enhancing the clarity of conversion in a vehicle interior.