Nippon Electric Glass Co., Ltd.

Tadashi Seto

Hirokazu Takeuchi

Nagaharu Nakajima

Hirokazu Tanaka

Masanori Wada

Masaaki Kadomi

Sotohiro Nakajima

Yoshimasa Yamaguchi

Mitsutaka Nakae

Masanobu Minami

Katsumi Inada

Kazunari Yamamoto

Jyunji Fujikawa

Shintaro Ito

Disclosed is an optical collimator-use lens component including: a thin tube; a partially spherical lens that has been fixed in an inner hole of the thin tube so that an insertion portion having a predetermined length is left, is made of glass whose refractive index is approximately uniform, and has translucent spherical surfaces, whose centers of curvature are approximately the same, at both ends of a cylindrical portion of the partially spherical lens; and an adhesive that bonds the partially spherical lens to the thin tube. An axial deviation amount between a center axis of the thin tube and an optical axis of the partially spherical lens is 5 &#x3bc;m or less. When a capillary tube, in whose inner hole an optical fiber has been fixed and whose axial deviation amount between an outer peripheral surface of the capillary tube and a core center of an end surface of the optical fiber is 1.5 &#x3bc;m or less, is inserted into the insertion portion of the thin tube and the end surface of the optical fiber is fixed at a position at which a distance of the end surface to a focal point position of the partially spherical lens becomes &#xb1;40 &#x3bc;m or less, emission light has an emission light bend of 0.2&#xb0; or less with respect to the center axis of the thin tube.

Optical collimator-use lens component, optical collimator, and method of assembling these

A prism is produced by the steps of feeding a glass base material into a heating furnace, the glass base material having surfaces to be prism surfaces after forming, the Ra value of the surface roughness of the surface being less than the Ra value corresponding to #170, the glass base material having a predetermined dimensional ratio, grasping the glass base material with feeding means, and feeding the glass base material into a heating furnace to heat the glass base material to a temperature so that a minimum viscosity of the glass base material becomes equal to or more than 10Pa&#xb7;s and less than 10Pa&#xb7;s, drawing and forming the lower portion of the glass base material, and then cutting the glass base material to obtain a longer body having a desired dimension and prism surfaces with the Ra value of the surface roughness equal to or less than a quarter of the wavelength of incident light, and cutting the longer body into desired length.

Prism and method for producing the same

In the capillary tube,, the cross section of the outer surface is substantially square, and the cross section of the insertion hole,is substantially square. Sides La, Lb of the outer surface have high dimensional accuracy and the insertion hole,is made to allow two optical fibers,to be inserted while adjoining each other and arranged in order therein. The phases of the outer surface and the insertion hole,are relatively offset with each other, so that angles &thgr;a, &thgr;b which the sides,of the insertion hole,form with flat surfaces,of the outer surface are acute angles of substantially 45&deg;&plusmn;0.5&deg;. Consequently, the flat surface,becomes substantially parallel to the center line M that connects the centers of the cores,of the two optical fibers,inserted in the insertion hole,, and the flat surface,becomes substantially perpendicular to the center line M.

Optical fiber holding capillary tube

A permanent optical fiber connector which makes it possible to connect and fix optical fibers (A) in some seconds. This connector comprises a base part (B) including a base body (4) made of a material of low expansion coefficient having a pair of opposed locking elements (7) and one or more capillary tubes (5) bonded to the base body and having an inner diameter slightly greater than the cladding of an optical fiber, and an optical fiber pressing part (C) including a pressing body (21) made of a material of low expansion coefficient and adapted to fit between the locking elements (7) of the base body to be embraced thereby and elastic bodies (22) attached to the lower surface of the pressing body, said pressing body (21) being embraced between the locking elements (7) of the base body, whereby the optical fiber pressing part (C) presses the covers (3) and optical fiber bodies (2) of the optical fibers (A) against the base part (B) to fix them to the latter.

Time-reducing optical fiber connector

Growing community of inventors

Otsu, Japan

Tadashi Seto