US 7,573,645 B2
Method for manufacturing optical element of refractive index distribution type
Tatsuya Suetsugu, Osaka (Japan); Norimasa Kominami, Osaka (Japan); Takeshi Ohtani, Osaka (Japan); Naoko Kaga, Osaka (Japan); Hiroaki Yokoi, Osaka (Japan); Minoru Takada, Osaka (Japan); Takashi Tarumi, Osaka (Japan); Toshihiko Einishi, Osaka (Japan); and Kohei Kadono, Ikeda (Japan)
Assigned to Isuzu Glass Co., Ltd., Osaka (Japan); and National Institute of Advanced Industrial Science and Technology, Tokyo (Japan)
Appl. No. 10/589,725
PCT Filed Feb. 15, 2005, PCT No. PCT/JP2005/002245
§ 371(c)(1), (2), (4) Date Aug. 17, 2006,
PCT Pub. No. WO2005/080283, PCT Pub. Date Sep. 01, 2005.
Prior Publication US 2008/0204889 A1, Aug. 28, 2008
Int. Cl. G02B 3/00 (2006.01); C03C 15/00 (2006.01)
U.S. Cl. 359—652  [359/653; 359/654; 359/655; 65/30.13; 65/57] 12 Claims
OG exemplary drawing
 
1. A method of producing a graded refractive index optical element comprising applying a paste containing a copper compound, an organic resin and an organic solvent to a glass substrate containing an alkali metal component as a glass component and then performing heat treatment at a temperature below the softening temperature of the glass substrate.