Invention Grant
- Patent Title: Optical glass, precision press-molding and process for the production thereof, and optical element and process for the production thereof
- Patent Title (中): 光学玻璃，精密压制成型及其制造方法以及光学元件及其制造方法
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Application No.: US11717178Application Date: 2007-03-13
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Publication No.: US07955998B2Publication Date: 2011-06-07
- Inventor: Kazutaka Hayashi , Yasuhiro Fujiwara
- Applicant: Kazutaka Hayashi , Yasuhiro Fujiwara
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Nixon & Vanderhye P.C.
- Priority: JP2006-081484 20060323; JP2006-340778 20061219
- Main IPC: C03C3/155
- IPC: C03C3/155 ; C03C3/15 ; C03C3/066
Abstract:
A high-refractivity optical glass which has both a low-temperature softening property suitable for precision press-molding and glass stability suitable for hot-shaping of a preform, which contains, by mass %, 13 to 30% of B2O3, 0.1 to 4% of Li2O, 17 to 35% of ZnO, 15 to 45% of La2O3, 4 to 15% of Ta2O5 exclusive of 15%, 0 to 10% of ZrO2, 0 to 10% of Nb2O5 provided that Ta2O5/(Ta2O5+ZrO2+Nb2O5)>0.3, 0 to 20% of WO3 and 0 to 1% of Sb2O3 and which has a refractive index (nd) of 1.80 to 1.84 and an Abbe's number (νd) of 40.0 to 45.0.
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