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. 17, 2001
Filed:
Apr. 21, 1999
Yutaka Shiraishi, Annaka, JP;
Abstract
With relatively simple arrangement and at low cost, the present invention provides a single crystal pulling apparatus, by which it is possible to prevent a single crystal from being turned to polycrystal, to move the crystal itself smoothly and gently from a necking portion during pulling operation of the single crystal, and to reliably hold the single crystal even in case of trouble such as power suspension. The apparatus comprises a support base,as a dish-shaped member to support a portion with larger diameter,from below under a seed crystal,pulley means,for rotating the support base and being movable between a position where the support base does not support the lower end of the portion with larger diameter of the single crystal and a position where it supports the lower end of the portion with larger diameter depending on the rotation angle, pulley rotating means,and,for rotating the pulley means and moving said support base between said two positions, and pulling lifting means,and,for moving up said support base by lifting the pulley means while controlling the rate.