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. 26, 2006
Filed:
Jul. 15, 2002
Hiroshi Matsumoto, Kanagawa, JP;
Yasuo Iwabuchi, Kanagawa, JP;
Kenji Takahashi, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
The present invention provides a method and apparatus for preparing a rare earth-activated barium fluorohalide based phosphor, in which atmospheric states during calcining and during cooling can be optimally adjusted and a cooling rate can be selected in a wide range. In the preparing apparatus of the present invention, a mixtureof phosphor materials is calcined by a calcining furnaceto form a calcined product, and thereafter, the calcined product is cooled to thereby prepare a rare earth-activated barium fluorohalide based phosphor. A calcining regionin which the mixture of phosphor materials can be calcined is provided in the calcining furnaceand a portion of the calcining regionis connected, via a partition doorcapable of being opened and closed, to a cooling regionin which the calcined product can be cooled, at an outer side of the calcining furnaceFurther, the method for preparing the rare earth activated barium fluorohalide based phosphor of the present invention is carried out by using the above-described preparing apparatus.