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Method of manufacturing optical waveguide for touch panel

By using an uncured or semi-cured photopolymerizable resin composition and a light-transmissive material mold to pressurize and form the upper cladding layer, the problems of hole generation and low production efficiency in optical waveguide manufacturing are solved, and high-efficiency, low-cost manufacturing is achieved. Touch screen optical waveguide manufacturing.

Inactive Publication Date: 2009-09-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the optical waveguide manufactured in this way is used as a touch panel, the portion of the upper cladding layer 4 corresponding to the tip of the core 3 is formed into a lens shape (curved surface) 4a as shown in the figure, so if the lens shape 4a If the above-mentioned crack 41 exists at the end of a part, damage such as light condensing will occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] [Preparation of core forming material]

[0064] 100 parts by weight of bisphenoxyethanol fluorene diglycidyl ether, 30 parts by weight of 1,3,3-tri{4-[2-(3-oxetanyl)]butoxyphenyl}butyl 50% of alkane, 30 parts by weight of bisphenol fluorene tetraglycidyl ether, 0.5 parts by weight of 4,4-bis[two (β hydroxyethoxy) phenylsulfonium] benzenethio-bis-hexafluoroantimonate A propylene carbonate solution (photoacid generator: CP-200K manufactured by SAN-APRO Ltd.) was dissolved in 20 parts by weight of ethyl lactate which is a dilute solvent to prepare a core forming material.

[0065] [Modulation of lower cladding and upper cladding forming materials]

[0066] By mixing 100 parts by weight of an epoxy resin having an alicyclic skeleton (manufactured by Asahi Denka Corporation, EP-4080E), and 1 part by weight of the above-mentioned CP manufactured by SAN-APRO Ltd. as a photoacid generator (photopolymerization initiator) -200K, thereby modulating the forming materials of the l...

Embodiment 2

[0073] [Preparation of core forming material]

[0074] 40 parts by weight of bisphenoxyethanol fluorene diglycidyl ether, 30 parts by weight of 1,3,3-tri{4-[2[(3-oxetanyl)]butoxyphenyl]} 50% of butane, 30 parts by weight of bisphenol fluorene tetraglycidyl ether, 0.5 parts by weight of 4,4-bis[bis(β-hydroxyethoxy)phenylsulfonium]benzenethio-bis-hexafluoroantimonate A propylene carbonate solution (photoacid generator: manufactured by SAN-APRO Ltd., CP-200K) was dissolved in 30 parts by weight of ethyl lactate as a diluent solvent to prepare a core forming material.

[0075] [Modulation of lower cladding and upper cladding forming materials]

[0076] By using 100 parts by weight of an epoxy resin having an alicyclic skeleton (number average molecular weight (Mn): 2395, manufactured by Tohto Chemical Co., Ltd., ST-4100D), 1 part by weight of a photoacid generator (photopolymerization initiator) The aforementioned CP-200K manufactured by SAN-APRO Ltd. was dissolved in 80 parts b...

Embodiment 3

[0084] [Preparation of core forming material]

[0085] 40 parts by weight of bisphenoxyethanol fluorene diglycidyl ether, 30 parts by weight of 1,3,3-tri{4-[2[(3-oxetanyl)]butoxyphenyl]} 50% of butane, 30 parts by weight of bisphenol fluorene tetraglycidyl ether, 0.5 parts by weight of 4,4-bis[bis(β-hydroxyethoxy)phenylsulfonium]benzenethio-bis-hexafluoroantimonate A propylene carbonate solution (photoacid generator: manufactured by SAN-APRO Ltd., CP-200K) was dissolved in 20 parts by weight of ethyl lactate as a diluent solvent to prepare a core forming material.

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PUM

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Abstract

The invention provides a method of manufacturing optical waveguide for touch panel, which improving productivity while suppressing occurrence of voids. For formation of an over-cladding layer, a coating layer 4a of an uncured or half-cured photopolymerizable resin composition as an over-cladding layer material is formed over a surface of an under-cladding layer 2 formed with cores 3. In turn, a molding die 6 composed of a light-transmissive material is pressed against the coating layer 4a with a predetermined die surface of the molding die 6 being properly positioned with respect to the coating layer 4a, and then the coating layer 4a is exposed to light through the molding die 6. After the exposure, the molding die is removed. Thus, the over-cladding layer is formed, in which the cores 3 are buried.

Description

technical field [0001] The invention relates to a method for manufacturing an optical waveguide for a touch screen. Background technique [0002] Optical waveguides are installed in optical waveguide devices, optical integrated circuits, optical wiring substrates, etc., and are widely used in optical communications, optical information processing, and other general optical fields. In addition, in recent years, such an optical waveguide has generally been manufactured using a photosensitive resin such as an ultraviolet curable resin. For example, there may be mentioned a method of forming a photosensitive resin layer on the lower cladding layer after forming the lower cladding layer on the substrate; then, irradiating light to the layer formed of the photosensitive resin through a photomask of a predetermined pattern to thereby Expose, remove the non-exposed part with a developer, develop and form a core in a predetermined pattern, and then form an overcladding layer on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/13
CPCG06F3/0421G02B6/138G02B2006/12069G02B6/13
Owner NITTO DENKO CORP