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:
Apr. 09, 2019
Filed:
Aug. 23, 2016
Shin-etsu Handotai Co., Ltd., Tokyo, JP;
Kiyotaka Takano, Annaka, JP;
SHIN-ETSU HANDOTAI CO., LTD., Tokyo, JP;
Abstract
A single-crystal pulling apparatus including a pulling furnace containing a crucible containing molten single crystal material, and a magnetic field generation device that is arranged around the furnace, has superconducting coils, and generates a magnetic field distribution. A magnetic flux density distribution on an X axis, which is a direction of magnetic force lines at the central axis in a horizontal plane, is a convex upward distribution, and a magnetic flux density on the X axis becomes 80% or less of a magnetic flux density set value at a crucible wall. Simultaneously, a magnetic flux density distribution on a Y axis, orthogonal to the X axis, is a convex downward distribution, and a magnetic flux density on the Y axis becomes 140% or more of the set value at the crucible wall when the magnetic flux density at the central axis in the horizontal plane is the set value.