Patent ID: 10252936

Abstract:
A near-infrared cut filter glass includes: P, Al, R (R represents any one or more of Li, Na, and K), R′ (R′ represents any one or more of Mg, Ca, Sr, Ba, and Zn), and Cu, and not including F practically, wherein (Cu+ amount/total Cu amount)×100[%] is 0.01 to 7.0%. The filter glass may further include, by mol %, 0 to 10% B2O3. The filter glass may have a fracture toughness value of the near-infrared cut filter glass is 0.3 MPa·m1/2 or more. For the filter glass, a quotient obtained by dividing an absorption constant at a wavelength of 430 nm by an absorption constant at a wavelength of 800 nm, of the near-infrared cut filter glass, may be 0.00001 to 0.19.