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Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof

  • US 20050164864A1
  • Filed: 01/21/2005
  • Published: 07/28/2005
  • Est. Priority Date: 01/23/2004
  • Status: Active Grant
First Claim
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1. An optical glass having a refractive index (nd) of at least 1.57 but less than 1.67 and an Abbe'"'"'s number (ν

  • d) of over 55 but not more than 65, the optical glass containing B2O3, SiO2, La2O3, Gd2O3, an alkali metal oxide and an alkaline earth metal oxide as essential components, having a B2O3 and SiO2 total content of 52% by weight or more and having an SiO2/B2O3 content ratio of from 0.38 to 1.2.

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