US 7,321,703 B2 | ||
Optical device | ||
Masashi Fukuyama, Inuyama (Japan); Yasunori Iwasaki, Nishikasugai-Gun (Japan); and Akiyoshi Ide, Kasugai (Japan) | ||
Assigned to NGK Insulators, Ltd., Nagoya (Japan) | ||
Filed on Jun. 17, 2005, as Appl. No. 11/156,324. | ||
Application 11/156324 is a continuation in part of application No. PCT/JP03/16348, filed on Dec. 19, 2003. | ||
Application PCT/JP03/16348 is a continuation in part of application No. 10/732203, filed on Dec. 10, 2003, abandoned. | ||
Claims priority of provisional application 60/435105, filed on Dec. 20, 2002. | ||
Claims priority of application No. 2002-370751 (JP), filed on Dec. 20, 2002; and application No. 2003-157196 (JP), filed on Jun. 02, 2003. | ||
Prior Publication US 2005/0238280 A1, Oct. 27, 2005 | ||
Int. Cl. G02B 6/12 (2006.01) |
U.S. Cl. 385—14 [385/129] | 5 Claims |
1. An optical device comprising:
a slit defined in light transmitting means, wherein said slit has a width ranging from 15 μm to 50 μm and an angle ranging
from 15° to 25° with respect to a reference plane;
a filter member inserted in said slit for dividing a portion of signal light propagated through said light transmitting means,
said filter member comprising a quartz substrate and a multilayer film disposed on a principal surface of said quartz substrate;
and
a silicone-based gel material filling said slit and having a light transmission capability, wherein said gel material has
a refractive index ranging from 1.41 to 1.48 and a Young's modulus of 1 MPa or less.
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