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. 14, 1982
Filed:
Sep. 08, 1980
Churyo Kodama, Ohme, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention relates to a fluorescent lamp of the reflective layer type comprising a first phosphor layer and a second phosphor layer laminated partially on the first phosphor layer. The first phosphor layer is formed on the entire face in the circumferential direction of the inner wall of a glass tube, and the second phosphor layer is formed on the first phosphor layer at a certain coating angle along the axial direction of the glass tube. The average particle size of the phosphor constituting the first phosphor layer is different from the average particle size of the phosphor constituting the second phosphor layer. In the fluorescent lamp of the reflective layer type having this structure, a high illuminance can be obtained.