Title:
タッチパネル用光導波路およびそれを用いたタッチパネル
Document Type and Number:
Japanese Patent JP4845851
Kind Code:
B2
Abstract:
An optical waveguide for a touch panel and a touch panel using the same. A lens portion 30 formed in an end portion of each light-emitting core 3 and each light-receiving core 3 has a tapered portion 31 such that the width thereof gradually increases toward an end surface thereof. The end surface is an arcuately curved surface 32 which bulges outwardly and has a radius of curvature R. When the tapered portion 31 has a length L not less than 800 µm, a taper angle ± is in the range of 2 to 20 degrees, and (A) is satisfied. When the tapered portion 31 has a length L not less than 400 µm but less than 800 µm, the taper angle ± is in the range of 4 to 16 degrees, and condition (A) is satisfied. 0.5 × L × tan ± / 2 < R < 2.5 × L × tan ± / 2 .
Inventors:
Twelve travelogues
Application Number:
JP2007275266A
Publication Date:
December 28, 2011
Filing Date:
October 23, 2007
Export Citation:
Assignee:
NITTO DENKO CORPORATION
International Classes:
G02B6/122; G06F3/041
Domestic Patent References:
| JP6313817A | ||||
| JP2008502009A | ||||
| JP2008502008A | ||||
| JP2008518251A | ||||
| JP2008504563A | ||||
| JP2007509372A | ||||
| JP9212303A |
Foreign References:
| US20050271326 | ||||
| US20050271983 | ||||
| US20060088244 | ||||
| US20050271319 |
Attorney, Agent or Firm:
Masahiko Nishito
Iisaki Aika
Yuko Saito
Iisaki Aika
Yuko Saito