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:
Mar. 26, 2002
Filed:
Nov. 05, 1999
Super Silicon Crystal Research Institute Corp., Gunma, JP;
Abstract
The present invention aims to improve thermal efficiency and to reduce melting time when a raw material in an auxiliary crucible is heated and melted by induction heating method. When an initial raw material is at low temperature and its conductivity is relatively low, a conductive carbon cylinder is arranged at such a height as to cover the entire side wall of the auxiliary crucible , and when high frequency current is applied on a high frequency coil , secondary induction current is generated on the carbon cylinder . Then, Joule heat is generated on the carbon cylinder by the secondary induction current, and heat of the carbon cylinder is transmitted to the raw material inside via the auxiliary crucible . Thus, the raw material is heated, and melting is started. When the raw material is melted, an insulating ceramic base is arranged at such a position as to cover the entire side wall of the auxiliary crucible . Because conductivity of the raw material is gradually increased, secondary induction current is generated in the melt , and Joule heat is generated in the melt itself by the secondary induction current.