Optical glass

Details Optical glass Optical glass

2011-08-23

2011-08-23

Lorengo, Jerry (Department: 1731)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S073000, C501S077000, C501S079000

Reexamination Certificate

active

08003556

ABSTRACT:
There is provided an optical glass with a high refractive index and a low dispersion having a refractive index (nd) of not less than 1.75 and an Abbe's number (νd) of not less than 35 where the image formation characteristic is hardly affected by changes in temperature of the using environment. SiO2, B2O3and La2O3are contained as essential components and the ratio of the constituting components are adjusted whereby an optical glass in which a product of α and β where α is an average linear expansion coefficient at −30 to +70° C. and β is an optical elasticity constant at the wavelength of 546.1 nm is not more than 130×10−12° C.−1×nm×cm−1×Pa−1is able to be achieved.

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Chinese Office Action dated Dec. 31, 2010, issued in corresponding Chinese Patent Application 200710151795.6.

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