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:
May. 26, 2009
Filed:
Sep. 28, 2005
Hideki Wada, Takatsuki, JP;
Hirofumi Yamashita, Moriguchi, JP;
Shogo Toda, Takatsuki, JP;
Yoshio Manabe, Katano, JP;
Takashi Maniwa, Takatsuki, JP;
Nozomu Hashimoto, Osaka, JP;
Kazuhiro Matsuo, Takatsuki, JP;
Katsumi Itagaki, Kyoto, JP;
Hideki Wada, Takatsuki, JP;
Hirofumi Yamashita, Moriguchi, JP;
Shogo Toda, Takatsuki, JP;
Yoshio Manabe, Katano, JP;
Takashi Maniwa, Takatsuki, JP;
Nozomu Hashimoto, Osaka, JP;
Kazuhiro Matsuo, Takatsuki, JP;
Katsumi Itagaki, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A fluorescent lamp including a glass bulb, a protection layer formed on an inner surface of the glass bulb, and a phosphor layer formed on a surface of the protection layer. The surface of the protection layer that is in contact with the phosphor layer has cracks. The bulk density of the metal oxide particles in the protection layeris 80% or more. The surface of the protection layerhas 20 to 200 cracks per millimeter in a tube axis direction. The average particle diameter of the metal oxide particles is in the range from 0.01 μm to 1 μm. The thickness of the protection layer is in the range from 0.5 μm to 5 μm.