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. 22, 2005
Filed:
Sep. 07, 2000
Yoshinori Fukuba, Hiroshima, JP;
Takashi Akita, Hiroshima, JP;
Kikue Irie, Hiroshima, JP;
Toshinori Sumi, Hiroshima, JP;
Masashi Okamoto, Hiroshima, JP;
Jun Okumura, Toyama, JP;
Shigeaki Sasaki, Tokyo, JP;
Yoshinori Fukuba, Hiroshima, JP;
Takashi Akita, Hiroshima, JP;
Kikue Irie, Hiroshima, JP;
Toshinori Sumi, Hiroshima, JP;
Masashi Okamoto, Hiroshima, JP;
Jun Okumura, Toyama, JP;
Shigeaki Sasaki, Tokyo, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
The present invention relates to a production method of a plastic optical fiber which comprises the steps of heat drawing an undrawn plastic optical fiber obtained by melt spinning and annealing the drawn fiber at a circumferential velocity ratio between the front and rear rollers (circumferential velocity of a rear roller/circumferential velocity of a front roller) of 0.5 to 1.2 under heating conditions which satisfy 4≦y≦−1.5x+330 and (Tgc−5)° C.≦x≦(Tgc+110)° C. [Tgc: a glass transition temperature of a core, x: an annealing temperature (° C.), and y: an annealing time (seconds)]. According to the present invention, a plastic optical fiber having a small thermal shrinkage ratio and excellent heat resistance can be provided.