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
OG exemplary drawing
 
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.