Title:
OPTICAL GLASS AND LENS
Document Type and Number:
Japanese Patent JP2005154251
Kind Code:
A
Abstract:
To provide glass having higher refractive index to obtain a lens having a larger numerical aperture.
The optical glass contains, by mol.%, 20-70 B2O3, 5-25 ZnO, 5-30 La2O3, 1-20 Ga2O3, 0-15 Li2O, 0-20 GeO2, 0-10 Y2O3, 0-20 TeO2, 0-20 (ZrO2+In2O3+Gd2O3+Ta2O3), wherein (Ba2O3+GeO2) is 30-70%, and the refractive index of light ray in 633 nm wavelength is ≥1.70. In the optical glass, the glass transition point is ≤650°C, the internal transmittance of light ray at 400-800 nm wavelength is ≥98% in 1 nm thickness. The lens is formed from the optical glass.
Inventors:
KOBAYASHI TOMOYUKI
MATSUMOTO SHUJI
SASAI ATSUSHI
SUGIMOTO NAOKI
MATSUMOTO SHUJI
SASAI ATSUSHI
SUGIMOTO NAOKI
Application Number:
JP2004188084A
Publication Date:
June 16, 2005
Filing Date:
June 25, 2004
Export Citation:
Assignee:
ASAHI GLASS CO LTD
International Classes:
G02B3/00; C03C3/15; C03C3/155; C03C3/253; (IPC1-7): C03C3/15; C03C3/155; C03C3/253; G02B3/00