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. 02, 2010
Filed:
Sep. 08, 2005
Hisao Tokoro, Tochigi, JP;
Kazutoshi Sasaki, Imaichi, JP;
Mitsuru Shinohara, Kanuma, JP;
Masakazu Sakaguchi, Tokyo, JP;
Masatoshi Kuroda, Osaka, JP;
Koichi Kimura, Osaka, JP;
Yoshiyuki Ishibashi, Osaka, JP;
Hisao Tokoro, Tochigi, JP;
Kazutoshi Sasaki, Imaichi, JP;
Mitsuru Shinohara, Kanuma, JP;
Masakazu Sakaguchi, Tokyo, JP;
Masatoshi Kuroda, Osaka, JP;
Koichi Kimura, Osaka, JP;
Yoshiyuki Ishibashi, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A hemispherical Luneberg dielectric lens including a hemispherical center layer having a hemispherical outer surface, and a plurality of hemispherical dome-shaped layers each having concentric hemispherical inner and outer surfaces, the outer surfaces of the center layer and dome-shaped layers having different diameters and the inner surfaces of said dome-shaped layers having different diameters. The center layer and dome-shaped layers are successively concentrically fitted into one another and integrated into a hemispherical shape. The center layer is a foam molding of ceramic-containing thermoplastic resin expanded beads, while each of said dome-shaped layers is a foam molding of thermoplastic resin expanded beads containing 0 to 80% by weight of a ceramic. The ceramic content per unit volume of the center and dome-shaped layers decreases from the center layer to the outermost dome-shaped layer, and the standard deviation of the apparent density of each of the center and dome-shaped layers is 0.07 g/cm3 or lower.