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:
Jan. 22, 2013
Filed:
Mar. 20, 2007
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Hitoshi Kitagawa, Sendai, JP;
Kyoto University, Kyoto-shi, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
Holesare created in a slab-shaped body. On the first surfaceof the body, the holesare arranged at the lattice points of a triangular lattice. On the second surface, they are arranged at the lattice pointslocated at positions corresponding to the gravity center of a triangular lattice. Three air columnsA obliquely extend from each lattice pointto the nearest three lattice points. Similarly, three air columnsA obliquely extend from each lattice pointto the nearest three lattice points. In this construction, a periodic structural unitconsisting of three holes is created within the bodyand this unit has a C-symmetrical shape at any sectionparallel to the body. Due to this symmetry and the obliquely extending form of the air columnA, a complete PBG with a large width is obtained. In one embodiment, a broad complete PBG whose width equals 15% of its middle value is obtained.