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. 21, 1992
Filed:
Dec. 21, 1990
Koji Mizuishi, Annaka, JP;
Michiaki Oda, Annaka, JP;
Yasushi Nakamura, Tomioka, JP;
Seiichiro Ohtsuka, Tomioka, JP;
Atsushi Shiozawa, Fukushima, JP;
Fumio Yamada, Gunma, JP;
Masahiro Mashimo, Annaka, JP;
Tooru Ohara, Annaka, JP;
Eizi Namiki, Tomioka, JP;
Shin-Etsu Handotai Co., Ltd., Tokyo, JP;
Abstract
An apparatus for producing a single crystal grown by Czochralski method includes a winding drum disposed in a case for winding up and down a flexible pull wire, a power transmission mechanism for driving the winding drum, and a bearing unit for rotatably supporting the winding drum. The power transmission mechanism and the bearing unit are disposed outside the case and isolated from the furnace atmosphere surrounding the winding drum and the pull wire in the case. With this construction, metallic dust produced by abrasion from the power transmission mechanism and the bearing unit has no influence on the condition of the furnace atmosphere and hence the quality of a single crystal being pulled upwardly by the pull wire.