Title:
HIGH REFRACTIVE INDEX, LOW DISPERSIBILITY AND LOW DENSITY OPTICAL GLASS USEFUL FOR CORRECTING LENS
Document Type and Number:
Japanese Patent JPS593041
Kind Code:
A
Abstract:
An optical quality glass suitable for use in ophthalmic lenses having a refractive index of at least 1.59, an Abbe number of at least 40.5, a density of no greater than 2.67 g/cm-3, and a coefficient of thermal expansion alpha of less than 90x10-7 per DEG C. contains at least 90 mole % of SiO2, Li2O, Na2O, K2O, CaO, and TiO2, and essentially does not contain Al2O3, B2O3, or oxides of elements having atomic weights above 90, such as Nb2O5, La2O3, or ZrO2.
Inventors:
KAARUUHAINTSU MAADAA
RAINHARUTO KASUNAA
RAINHARUTO KASUNAA
Application Number:
JP10350483A
Publication Date:
January 09, 1984
Filing Date:
June 09, 1983
Export Citation:
Assignee:
SHIYOTSUTO OPUTEIKARU GLASS IN
International Classes:
C03C1/10; C03C3/076; C03C3/078; C03C4/00; C03C4/02; G02C7/00; (IPC1-7): C03C1/10; C03C3/04; C03C3/10; C03C3/30; G02C7/00
Domestic Patent References:
| JPS345128B1 | ||||
| JPS5659640A | 1981-05-23 |
Attorney, Agent or Firm:
Mikio Hatta
Next Patent: QUARTZ GLASS AND ITS MANUFACTURE