Optical fiber resin coating apparatus

An optic fiber resin coating apparatus comprising:

• a nipple including a nipple hole, a resin reserving chamber for storing a resin, and a resin supply inlet, said nipple hole having a first tapered-hole portion through which an optical fiber is introduced therethrough and a first land portion continuing from the first tapered-hole portion and defining a first hole of a first diameter, a meniscus-shaped portion being positioned at an end of the first land portion;
• a resin coating die, including a second tapered-hole and a second land portion continuing from the second tapered-hole and defining a second hole of a second diameter of a resin coated optical fiber;
• and
• an intermediate die provided between the nipple and the resin coating die, including a third hole which communicates an end of the nipple hole and the second tapered-hole and has a third diameter, and a fourth hole which communicates with the resin reserving chamber,
• a center axis of the nipple hole in the nipple, a center axis of the second hole of the resin coating die and a center axis of the third hole of the intermediate die being aligned,
• a first resin flow path being defined at a boundary position of the nipple and the intermediate die, said first resin flow path communicating with the resin reserving chamber, the end of the nipple hole and the third hole in the intermediate die, and
• a second resin flow path being defined at a boundary position of the intermediate die and the resin coating die, said second resin flow path communicating with the third hole in the intermediate die, the second tapered-hole in the resin coating die and the fourth hole of the intermediate die, and said second resin flow path communicating with said resin reserving chamber connected to said first resin flow path through said tapered-portion of said resin coating die and said fourth hole of said intermediate die.