公开(公告)号：JPH04232906A

公开(公告)日：1992-08-21

申请号：JP40868690

申请日：1990-12-28

Applicant: TORAY INDUSTRIES

Inventor： FUJITA ISAO ,  MAEDA NORINOBU ,  SUGANUMA HEIROKU ,  MATSUNAGA TADAYOSHI

IPC: G02B6/122 ,  G02B6/00 ,  G02B6/02 ,  G02B6/12 ,  G02B6/13

Abstract: PURPOSE:To improve flexibility and light-guiding property and to prevent scratches by forming a hard coating film on the outermost part of a flexible multilayer light guide sheet having a specified sheet-type light guide layer and a coating layer. CONSTITUTION:The flexible light guide sheet consists of a sheet-type light-guide inner layer (A) and an intermediate layer (B) which covers wholly around the layer (A). The inner layer (A) consists of a polymer essentially comprising polymethyl methacrylate and having light transmitting performance, while the intermediate layer (B) consists of a fluorine polymer and has a smaller refractive index by 0.02 or more than the refractive index of the polymer of the inner layer (A). Moreover, the outermost surface is covered with a hard coating film (D). This flexible multilayer light guide sheet satisfies the conditions for its cross-sectional shape that 7

公开(公告)号：JPH0777613A

公开(公告)日：1995-03-20

申请号：JP22270893

申请日：1993-09-08

Applicant: TORAY INDUSTRIES

Inventor： ITO YOSHIMITSU ,  MAEDA NORINOBU

IPC: C08F20/14 ,  C08F20/22 ,  C08F220/10 ,  G02B6/00

Abstract: PURPOSE:To easy produce the plastic optical fiber which has an excellent light transmission characteristic and heat resistance, is uniform in the thickness of a sheath part and is free from the unequalness of a fiber diameter and further, to increase output without trouble at the time of spinning. CONSTITUTION:The plastic optical fiber having a core-sheath composite structure is produced by using a methyl methacrylate polymer as a core component and a fluorine-containing methacrylate polymer as a sheath component. The reduction viscosity in the fluorine-contained methacrylate polymer is specified to 0.35 to 0.58 and the amt. of the residual monomer to