Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2008-10-22
2010-11-02
Petkovsek, Daniel (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S043000, C385S131000, C345S175000, C345S176000
Reexamination Certificate
active
07826699
ABSTRACT:
An optical waveguide for a touch panel and a touch panel using the same. A lens portion30formed in an end portion of each light-emitting core3and each light-receiving core3has a tapered portion31such that the width thereof gradually increases toward an end surface thereof. The end surface is an arcuately curved surface32which bulges outwardly and has a radius of curvature R. When the tapered portion31has a length L not less than 800 μm, a taper angle α is in the range of 2 to 20 degrees, and (A) is satisfied. When the tapered portion31has a length L not less than 400 μm but less than 800 μm, the taper angle α is in the range of 4 to 16 degrees, and condition (A) is satisfied.in-line-formulae description="In-line Formulae" end="lead"?0.5×L×tan(α/2)<R<2.5×L×tan(α/2). (A)in-line-formulae description="In-line Formulae" end="tail"?
REFERENCES:
patent: 6181842 (2001-01-01), Francis et al.
patent: 7520050 (2009-04-01), Graham
patent: 7546009 (2009-06-01), Kukulj et al.
patent: 2004/0201579 (2004-10-01), Graham
patent: 2005/0089298 (2005-04-01), Maxwell et al.
patent: 2009/0237375 (2009-09-01), Khan et al.
Nitto Denko Corporation
Petkovsek Daniel
Westerman Hattori Daniels & Adrian LLP
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