METHOD AND DEVICE FOR COATING PLASTIC OPTICAL FIBER WITH RESIN

摘要

A coating apparatus having a die (30) and a nipple (31) coats a plastic optical fiber (11) with a protective layer (39) formed from a thermoplastic resin (32). The diameter TA (µm) of the die, the outer diameter TB1 (µm) of the nipple, the inner diameter TB2 (µm) of the nipple and the diameter D (µm) of the optical plastic fiber satisfy the following formulae: 20 (µm) <= (TA-TB1) <= 1500 (µm), 20 (µm) <= (TB2-D) <= 600 (µm), 400 (µm) < (TB1-TB2) <= 1500 (µm). Thereby, the thermoplastic resin (32) is coated on the plastic optical fiber (11) without causing stress distribution to the plastic optical fiber (11).