In the present invention, the presence or absence of coloration on the glass and the degree of coloration were determined by measuring the transmittance of the glass. The transmittance of the glass in each of Examples was measured in conformity with JOGIS02-2003, which is the standard of the Japan Optical Glass Manufacturers' Association. (7) An optical apparatus includes the optical element according to (6).(6) An optical element is formed of the optical glass according to any one of (1) to (4).(5) A preform is formed of the optical glass according to any one of (1) to (4). (4) The optical glass according to any one of (1) to (3) has a refractive index (n d) of 1.65 or more and 2.00 or less and an Abbe number (ν d) of 10 or more and 35 or less.(3) In the optical glass according to (1) or (2), an average linear thermal expansion coefficient α at 100☌ to 300☌ is 80 (10 -7 ☌ -1) or more.(2) The optical glass according to (1) contains 10.0% to 35.0% of a total mass (Na 2O + K 2O + BaO).(1) An optical glass contains, on a mass% basis, 20.0% to 40.0% of a P 2O 5 component, 25.0% to 50.0% of a Nb 2O 5 component, and 3.0% to 30.0% of a total mass (Na 2O + K 2O), wherein a temperature coefficient (40☌ to 60☌) of a relative refractive index (589.29 nm) is in the range of +3.0 × 10 -6 to -10.0 × 10 -6 (☌ -1).Specifically, the present invention provides the following. Thus, they have completed the present invention. C03C2201/50- Doped silica-based glasses containing metals containing alkali metalsĪs a result of thorough studies to solve the above problem, the present inventors have found that an inexpensive glass having a low temperature coefficient of relative refractive index is obtained when the glass contains a P 2O 5 component and a Nb 2O 5 component and contains a Na 2O component and a K 2O component in a particular amount.C03C2201/40- Doped silica-based glasses containing metals containing transition metals other than rare earth metals, e.g.C03C2201/30- Doped silica-based glasses containing metals.C03C2201/06- Doped silica-based glasses.G02B1/00- Optical elements characterised by the material of which they are made Optical coatings for optical elements.G02B- OPTICAL ELEMENTS, SYSTEMS OR APPARATUS.C03C3/062- Glass compositions containing silica with less than 40% silica by weight.C03C3/04- Glass compositions containing silica.C03C3/21- Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum.C03C3/16- Silica-free oxide glass compositions containing phosphorus.C03C3/12- Silica-free oxide glass compositions.C03C- CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS SURFACE TREATMENT OF GLASS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS JOINING GLASS TO GLASS OR OTHER MATERIALS. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Ohara Inc filed Critical Ohara Inc Priority claimed from PCT/JP2018/015070 external-priority patent/WO2018230124A1/en Publication of EP3640222A1 publication Critical patent/EP3640222A1/en Status Withdrawn legal-status Critical Current Links Original Assignee Ohara Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Inventor Nana Iwasaki Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Withdrawn Application number EP18816712.6A Other languages German ( de) Google Patents Optical glass, preform, and optical elementĭownload PDF Info Publication number EP3640222A1 EP3640222A1 EP18816712.6A EP18816712A EP3640222A1 EP 3640222 A1 EP3640222 A1 EP 3640222A1 EP 18816712 A EP18816712 A EP 18816712A EP 3640222 A1 EP3640222 A1 EP 3640222A1 Authority EP European Patent Office Prior art keywords component glass less refractive index content Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents EP3640222A1 - Optical glass, preform, and optical element EP3640222A1 - Optical glass, preform, and optical element
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