Patent ID: 9359246
Filing Date: 2016-06-07
CPC Classification: C03B,C03C,Y02P

Claim Text:
1. An optical glass comprising at least one oxide selected from the group consisting of TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 as a glass component, wherein a total content of said TiO a value of βOH shown in below equation (1) satisfies a relation shown in below equation (2); in the equation (1), “t” is a thickness of said glass used for a measurement of an external transmittance, “A” is the external transmittance (%) at a wavelength of 2500 nm when a light enters into said glass in parallel to a thickness direction thereof, and “B” is the external transmittance (%) at the wavelength of 2900 nm when a light enters into said glass in parallel to the thickness direction thereof; in the equation (2), “HR” shows a total amount (mol %) of a content of each component of TiO 2 , Nb 2 O 5 , WO 3 and Bi 2 O 3 in said glass; in the equations (1) and (2), “ln” is natural logarithm.