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:
Jan. 30, 2001
Filed:
Dec. 08, 1997
Soichiro Kenmochi, Tokyo, JP;
Hideo Hirasawa, Gunma, JP;
Tadakatsu Shimada, Gunma, JP;
Akihiko Suzuki, Tokyo, JP;
Waichi Yamamura, Gunma, JP;
Yoshiaki Shimizu, Gunma, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
In the manufacturing of optical fiber preform with excellent accuracy of outer diameter made of the rod as drawn from synthetic quartz ingot, the outer diameter measuring devices,and,measure the outer diameters of the cone,and rod,drawn from the ingot,, and the drawing speed is controlled based on the measured outer diameters. The optical fiber preform manufacturing apparatus that finishes the rod into truly round form without any curve has a rotary holding means,and,that hold the rod,resulting from the heating and drawing of the ingot,rotating it in synchronization with the rotation of the ingot,, a comparison device,that outputs a signal after comparing the outer diameter of the cone,as measured by the outer diameter measuring device,with that of the referential circle, a control device,that controls the rotational amount of the rotating device,, and a control device,that controls the rotational amount of the rotary holding device,and