G - Physics – 02 – B
Patent
G - Physics
02
B
88/99
G02B 6/32 (2006.01)
Patent
CA 1295502
M08-47315M/MS/87 ABSTRACT OF THE DISCLOSURE A collimator lens for an optical fiber is disclosed. The collimator lens comprises a cylindrical member having an effective radius R and effective axial length L. The cylindrical member is formed of optically transparent material having refractive index n1. The cylindrical member has one circular end portion provided with a connecting portion connectable with a light emitting end face of an optical fiber and the other circular end portion provided with a fresnel lens pattern having a positive focal length F. The focal length F, the effective length L, the effective radius R and the refractive index n1 are satisfied with the following formula (I) and (II); F/L = tan {sin-1(NA/n1)}/tan {sin-1(NA)} ----(I) R ? L-tan {sin-1(NA/n1)} ----(II) in which NA is numerial aperture of the optical fiber.
546702
Kaneko Yasuhiro
Masuzawa Tokihiko
Mori Mitsuo
Takesue Masatoshi
Kaneko Yasuhiro
Masuzawa Tokihiko
Mitsubishi Rayon Co. Ltd.
Mori Mitsuo
Riches Mckenzie & Herbert Llp
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