Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonmechanical aftertreatment
Patent
1994-11-30
1996-10-22
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonmechanical aftertreatment
264 11, B29D 1100
Patent
active
055673635
ABSTRACT:
The present invention relates to a manufacturing method of a polymer GRIN lens which is used for focusing light in connections for example between two or more optical fibers and between an optical fiber and a light source in the optical communication field. The manufacturing method of a GRIN lens according to the present invention utilizes a characteristic of polystyrene that its refractive-index is decreased by sulfonation. The method includes polymerizing a sphere or rod made of a directional monomer that is capable of sulfonating like a styrene, together with a cross-linking agent, and a polymerization initiator; swelling the polymerized cross-linked polymer by using a predetermined solvent; and sulfonating the swollen cross-linked polymer using a sulfuric acid. Accordingly, the present method can be easily controlled to obtain the desired refractive-index distribution since the refractive-index distribution is determined by the diffusion of the sulfuric acid as a sulfonation.
REFERENCES:
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patent: 5405556 (1995-04-01), Liu
Koike et al-"Studies on the light-focusing plastic rod. 17: Plastic GRIN rod lens prepared by photocopolymerization of a ternary monomer system"; 1 Jun. 1984/vol. 23. No. 11/Applied Optics; pp. 1779-1783.
Ohtsuka et al-"Studies on the light-focusing plastic rod. 18: Control of refractive-index distribution of plastic radial gradient-index rod by photocopolymerization"; 15 Dec. 1985/vol. 24, No. 24/Applied Optics; pp. 4316-4320.
Iga et al-"Optimum diffusion condition in the fabrication of a plastic lenslike medium"; 15 May 1975/vol. 26, No. 10/Appl. Phys. Lett. pp. 578-579.
Jung Sang-Don
Song Seok-Ho
Electronics & Telecommunications Research Inst.
Vargot Mathieu D.
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