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. 22, 1980
Filed:
Aug. 29, 1978
Junetsu Akiyama, Yokohama, JP;
Takayoshi Fuchida, Tokyo, JP;
Akira Taya, Kawasaki, JP;
Kazunori Nagafuchi, Shime, JP;
Kohtaro Kohmoto, Yokohama, JP;
Tomohiko Kobuya, Kawasaki, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A fluorescent lamp which comprises a vacuum-tight envelope provided with electrodes between which discharge takes place during the operation of said fluorescent lamp. The envelope is coated on the inside with a phosphor composition layer comprising: a first light-emitting material having an emission spectrum with a peak in the wavelength range between 465 and 490 nm, or preferably between 480 and 490 nm, and a half width ranging from 30 to 120 nm, or preferably from 70 to 100 nm; a second light-emitting material having an emission spectrum with a peak in the wavelength range between 550 and 580 nm, or preferably between 560 and 570 nm, and a smaller half width than 110 nm; a third light-emitting material having an emission spectrum with a peak in the wavelength range between 600 and 620 nm, or preferably between 610 and 620 nm; and a fourth light-emitting material having an emission spectrum with a peak in the wavelength range between 480 and 500 nm, or preferably between 480 and 490 nm, thereby ensuring high luminous flux and satisfactory color rendering.