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:
Dec. 01, 2009
Filed:
Feb. 24, 2005
Mitsuo Nakamura, Niiza, JP;
Koji Shigenobu, Yokohama, JP;
Shunichi Yamada, Kamiiso-gun, JP;
Toshiba Materials Co., Ltd., Yokohama-shi, JP;
Sekonic Corporation, Tokyo, JP;
Abstract
A switch illuminating EL sheet () has a structure such that a transparent protection film (), a transparent electrode layer (), a light emitting layer (), a dielectric layer () and a back electrode layer () are layered in order from a light emitting face side. The transparent protection film () has a thickness of 10 μm to 60 μm. Further, the transparent electrode layer () is constituted of a conductive polymer. Such an EL sheet () can suppress wire breakage or failure to light due to keystroke stress or the like without impairing reliability and clicking feeling of a key switch. The EL sheet () is arranged, for example, between a key top () and a switch mechanism portion () as a light source for illuminating the key top portion ().