OPTICAL GLASS

WIPO Patent Application WO/2013/018586

A1

Provided is optical glass which has low glass transition temperature (Tg) and specific optical constants that are a refractive index (nd) of 1.60-1.80 and an Abbe number (νd) within the range of 30-60, while containing less rare earth elements. The optical glass has a refractive index (nd) within the range of 1.60-1.80, an Abbe number (νd) within the range of 30-60 and a glass transition temperature (Tg) of 600˚C or less, while containing, in mass% based on oxides, 20% or less of Ln2O3 (wherein Ln represents one or more elements selected from among La, Y, Yb and Gd), Bi2O3, Ta2O5, GeO2 and WO3 in total and 20% or less of Nb2O5. Preferably, the optical glass additionally contains, in mass% based on oxides, 10-50% of SiO2, 30% or less of B2O3, more than 0% but 20% or less of TiO2 and 10-60% (inclusive) of RO (wherein R represents one or more elements selected from among Mg, Ca, Zn, Sr and Ba).

TANAKA TAISUKE (JP)
OKANO HIROSHI (JP)
TOGASHI RYO (JP)
YAGI TOSHITAKA (JP)

PCT/JP2012/068717

February 07, 2013

July 24, 2012

Click for automatic bibliography generation  

OHARA KK (JP)
TANAKA TAISUKE (JP)
OKANO HIROSHI (JP)
TOGASHI RYO (JP)
YAGI TOSHITAKA (JP)

C03C3/066; C03B11/00; C03C3/064; C03C3/068; C03C3/089; C03C3/091; C03C3/093; C03C3/095; C03C3/097; G02B1/02

JP2009263141A	2009-11-12
JP2000344542A	2000-12-12
JP2006137628A	2006-06-01

SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)

View/Download PDF      PDF Help

Previous Patent: STRUCTURE FOR SUSPENSION

Next Patent: TYROSINASE INHIBITOR PRODUCED USING DRIED EARTHWORM POWDER, AND METHOD FOR PRODUCING SAME