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:
Apr. 15, 2008
Filed:
Jul. 17, 2003
Hirofumi Yamashita, Moriguchi, JP;
Haruo Yamazaki, Moriyama, JP;
Toshihiro Terada, Amagasaki, JP;
Shinji Kihara, Maizuru, JP;
Hirofumi Yamashita, Moriguchi, JP;
Haruo Yamazaki, Moriyama, JP;
Toshihiro Terada, Amagasaki, JP;
Shinji Kihara, Maizuru, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Panasonic Photo & Lighting Co., Ltd., Osaka, JP;
Abstract
A low-pressure discharge lamp () is provided that includes a glass tube () having an inner diameter in a range of 1 to 5 mm and a pair of electrodes () disposed at end portions in the glass tube (). The pair of electrodes () contain at least one transition metal selected from transition metals of Groups IV to VI. Mercury and a rare gas containing argon and neon are sealed in an inner portion of the glass tube (). A relationship between a cathode glow discharge density J and a composition index α of the sealed rare gas of the low-pressure discharge lamp () satisfies the following expressionα≦/()≦1.5α(where S represents an effective discharge surface area (mm) of an electrode, I represents a RMS lamp current (mA), P represents a pressure (kPa) of a sealed rare gas, and α represents a composition index of a sealed rare gas that is a constant expressed by α=(90.5A+3.4N)×10when a total of a composition ratio A of argon and a composition ratio N of neon is expressed by A+N=1).