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:
Feb. 13, 2001
Filed:
Dec. 23, 1998
Tokuji Maeda, Saga, JP;
Keiichi Takanashi, Hyogo, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
In a conventional method, it is difficult to reject a stray light component with certainty, so that it is difficult to accurately measure the temperature of the melt surface. Since a temperature measuring device and a computing means are expensive, the cost of the measurement tends to be high. Modifications to an existing apparatus for pulling a single crystal are required, which is an inconvenience. In order to solve the above problems, a CCD camera is used for detecting the radiation light luminance distribution of the melt surface, the minimum radiation light luminance L,is determined based on the radiation light luminance distribution data measured using the CCD camera, and the temperature T,of the melt surface within an apparatus for pulling a single crystal is computed based on the minimum radiation light luminance L,.