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Optical waveguide and opticaltouch panel

A technology of optical waveguide and wavelength, applied in the direction of light guide, optics, optical components, etc., can solve the problem that it is difficult to completely prevent external light 122 from entering the light receiving element 119

Inactive Publication Date: 2012-04-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, unless the unnecessary light 123 propagating in the cladding 116 is not blocked, it is difficult to completely prevent the external light 122 from entering the light receiving element 119.

Method used

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  • Optical waveguide and opticaltouch panel
  • Optical waveguide and opticaltouch panel
  • Optical waveguide and opticaltouch panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] [Preparation of cladding varnish]

[0078] 100 parts by weight of an epoxy ultraviolet curable resin having an alicyclic skeleton (ADEKA, EP4080E) and 2 parts by weight of a photoacid generator (SAN-APRO, CPI-200K) were mixed to prepare a varnish for clad formation.

[0079] [Preparation of varnish for core formation]

[0080] 40 parts by weight of an epoxy-based ultraviolet curable resin (manufactured by Osaka Gas Chemicals, OGSOL EG) containing a fluorene skeleton, 1,3,3-tri{4-[2-(3-oxetane)]butoxy 30 parts by weight of phenyl}butane, 1 part by weight of a photoacid generator (manufactured by San-Apro, CPI-200K), and 41 parts by weight of ethyl lactate were used to prepare a core-forming varnish. 1,3,3-Tris{4-[2-(3-oxetane)]butoxyphenyl}butane was synthesized according to Example 2 of JP 2007-070320.

[0081] [Production of Optical Waveguide]

[0082] A varnish for forming a cladding layer was coated on the surface of glass having a thickness of 1.1 mm. Next, irra...

Embodiment 2

[0094] The 12-type optical touch panel of Example 2 was fabricated using the same materials and the same manufacturing method as in Example 1. Such as Figure 7 As shown, the difference from Example 1 is that recesses are provided in a wide range of the cladding layers of the light-emitting side optical waveguide and the light-receiving side optical waveguide, and the same black dye as in Example 1 is filled into the recesses. The adhesive is provided with a baffle-shaped light absorbing portion.

[0095] Figure 9 (a) shows the cross section of the light emitting side optical waveguide 73 of the optical touch panel of the second embodiment. Figure 9 (b) shows a cross section of the light-receiving-side optical waveguide 71 of the optical touch panel of the second embodiment. Figure 9 (b) is a cross-sectional view of a portion where the light absorbing portion 12 exists. Such as Figure 9 As shown in (a), in the light-emitting side optical waveguide 73, the thickness of...

Embodiment 3

[0098] The 12-type optical touch panel of Example 3 was fabricated using the same materials as in Example 1 (except for the cladding layer of the light-receiving side optical waveguide) and the same manufacturing method. Such as Figure 8 As shown, the difference from Example 1 is that the cladding of the light-receiving side optical waveguide transmits infrared light with a wavelength around 850 nm and absorbs light with other wavelengths. In order to impart this characteristic to the cladding of the light-receiving side optical waveguide, when preparing the material of the cladding, 100 parts by weight of EP4080E manufactured by ADEKA Co., Ltd. and 2 parts by weight of CPI-200K manufactured by SAN-APRO Co. 0.05 parts by weight of the company's product, Plast Red 8335), 0.05 parts by weight of a yellow pigment (manufactured by Moto Chemical Co., Ltd., Plast Yellow 8070), and 0.05 parts by weight of a green pigment (manufactured by Moto Chemical Co., Ltd., Plast Green 8620). ...

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PUM

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Abstract

The invention provides an optical waveguide and an opticaltouch panel. Opticalthouch panels having optical waveguides are hardly affected by outside light. But sometimes, outside light enters into clads from the periphery of the coordinate input regions, is transmitted in the clads and enters into light-receiving elements. In addition, light leakded from cores is transmitted in the cores and enters into light-receiving elements. Therefore, it is difficult to prevent outside light from entering into light-receiving elements when light transmitted in the clads is not blocked. An optical waveguide (10) of the present invention includes a light-absorptive section (12) formed in a recess of a clad (11). The light-absorptive section (12) prevents unwanted light from traveling through the clad (11). The light-absorptive section (12) absorbs light at all wavelengths (infrared light, visible light, and ultraviolet light). The light-absorptive section (12) is located adjacent to a light-receiving element (13). In the case where there is a light-absorptive section (12), cores (14) are encircled by the thin clad (11) and the thin clad (11) encircling respective cores (14) is encircled by the light-absorptive section (12).

Description

technical field [0001] The present invention relates to an optical waveguide. In particular, it relates to an optical waveguide in which a recess is provided in a cladding, and a light-absorbing material for absorbing light of all wavelengths (infrared light, visible light, and ultraviolet light) is provided in the recess. In addition, it relates to an optical waveguide having a cladding for absorbing light of wavelengths other than the wavelength of the light emitting element. Also, it relates to an optical touch panel including these optical waveguides. Background technique [0002] The optical touch panel has a bright and clear image due to the high light transmittance in the coordinate input area. In addition, since there are no electrodes or sensors in the coordinate input area, it is difficult to cause deterioration due to touch, and the reliability is high. Therefore, it is widely used in bank ATMs, automatic ticket vending machines, etc. used by many unspecified p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G06F3/042
CPCG02B6/122G06F3/0421G06F3/0412
Inventor 后藤千里十二纪行长藤昭子
Owner NITTO DENKO CORP