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:
Feb. 17, 2015
Filed:
Dec. 11, 2012
Yasumasa Ooya, Chigasaki, JP;
Masahiko Yamakawa, Yokohama, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Katsutoshi Nakagawa, Yokohama, JP;
Yasumasa Ooya, Chigasaki, JP;
Masahiko Yamakawa, Yokohama, JP;
Yasuhiro Shirakawa, Yokohama, JP;
Katsutoshi Nakagawa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Materials Co., Ltd., Yokohama-shi, JP;
Abstract
In one embodiment, an LED light bulb includes an LED module, a base portion on which the LED module is disposed, and a globe attached to the base portion. The LED module includes an ultraviolet to violet light-emitting LED chip mounted on a substrate. A lighting circuit and a bayonet cap are provided in and on the base portion. A fluorescent film is provided on an inner surface of the globe, and emits white light by absorbing ultraviolet to violet light emitted from the LED chip. The fluorescent film has a film thickness in a range of 80 to 800 μm. In the LED light bulb, an amount of ultraviolet light which leaks from the globe is 0.1 mW/nm/lm or less.