| 摘要 |
PURPOSE:To secure a fluorescent lamp that is cheap in price and, what is better, ease of know-how for manufacturing, by covering a film of a mixed phosphor made by mixing one or several varieties of three-type phosphors and separate two-type phosphors from that, on the inner wall of an airtight vessel, in case of the fluorescent lamp available for lighting apparatus irradiating jewels. CONSTITUTION:In this fluorescent lamp, a film of a mixed phosphor made by mixing one or several types of phosphors selected from an A phosphor[3Sr3 (PO4)2SrCl2/Eu], a B phosphor[3Sr3(CP4)2CaCl/Eu]and a C phosphor[3(M, Eu)O.P2O5.B2O3.MCl2](provided M means Ca, Sr and Ba) with a D phosphor [3(Ba,Ca and Mg)2(PO4)2Cl2/Eu]and an E phosphor[(Sr, Mg, Ba)2(PO4)2/Sn]is applied to the inner wall of an airtight vessel. Therefore, the illumination required for appraisement of jewelry including a diamond can be performed and, what is better, deterioration in these phosphors never happens unlike actual cases in the past that have to mix so many as five types of phosphors at a time. |
