132 results about "Fluorophosphate glass" patented technology

Traditional incandescent and halogen lamps produce a high CRI warm white light with indirect emission patterns at the cost of poor energy efficiency. This new advancement in solid-state lighting enables the production of a new solid-state filament wherein the tungsten filament is replaced with an array of high efficiency LED emitters which combine through an equiangular spiral, or t-spline/TNURCC lightpipe network to produce a single homogeneous blue light source which then pumps a luminescent filament comprised of a phosphor loaded silicone, phosphor loaded polymer, a lanthanide doped fluoro-phosphate glass, glass ceramic tape, quantum dot filled composite, or super-continuum spectrum producing photonic crystalline structure.

Provided are an optical glass having high-refractivity, low-dispersion and anomalous partial dispersion properties, having excellent processability, being excellent as an anomalous partial dispersion glass for suppressing chromatic aberration, containing P⁵⁺, Al³⁺ and alkaline earth metal ions selected from the group consisting of Mg²⁺, Ca²⁺, Sr²⁺ and Ba²⁺ as essential cationic components and F⁻ and O²⁻ as essential anionic components, wherein the ratio of content of Ba²⁺ to the total content R²⁺ of Mg²⁺, Ca²⁺, Sr²⁺ and Ba²⁺, Ba²⁺/R²⁺, is 0.01 or more but less than 0.5 on the basis of cationic %, and having an Abbe's number (νd) of 68 or more, optical glass having an Abbe's number (νd) of 68 or more, a partial dispersion ratio of 0.535 or more and a frictional abrasion of 500 or less and an optical glass which is to be polished in a polishing step for producing an optical element and which is a fluorophosphate glass having a frictional abrasion of 500 or less.

There are provided a near-infrared cut filter that effectively uses near-infrared absorbing glass and a near-infrared absorbing dye and is excellent in a near-infrared shielding property, and a high-sensitivity solid-state imaging device including the same. A near-infrared cut filter includes: a near-infrared absorbing glass substrate made of CuO-containing fluorophosphate glass or CuO-containing phosphate glass; and a near-infrared absorbing layer containing a near-infrared absorbing dye (A) and a transparent resin (B), on at least one principal surface of the near-infrared absorbing glass substrate, wherein an average value of a transmittance in a 400 nm to 550 nm wavelength range is 80% or more, and an average value of a transmittance in a 650 nm to 720 nm wavelength range is 15% or less.

A fluorophosphate glass having a fluorine content of 25% or more by anionic %, which is produced from a glass raw material containing 0.1 to 0.5%, by anionic %, of a halide containing a halogen element selected from chlorine, bromine or iodine, and a phosphate glass having a fluorine content of less than 25% by anionic %, which is produced from a glass raw material containing 0.1 to 5% by anionic %, of a halide containing a halogen element selected from chlorine, bromine or iodine.

Provided is a low-dispersion optical glass that is formed of a fluorophosphate glass in which the molar ratio of the content of O²⁻ to the content of P⁵⁺, O²⁻/P⁵⁺, is 3.5 or more and that has an Abbe's number (ν_d) of over 70 or has an F⁻ content of 65 anionic % or more, and the optical glass enables the suppression of the volatilization of a glass component when an optical glass formed of a fluorophosphate glass is produced or when an obtained glass in a molten state is caused to flow out to shape it into a glass shaped material, so that the variation of properties such as a refractive index, etc., involved in the fluctuations of a glass composition and the variation of quality such as the occurrence of striae can be suppressed.

A low-dispersion optical glass suitable for producing a quality preform from a molten glass and suitable for precision press-molding, which is a fluorophosphate glass containing, as essential cationic components, P⁵⁺, Al³⁺, at least two members selected from Mg²⁺, Ca²⁺, Sr²⁺ and Ba²⁺ as divalent cationic components (R²⁺) and Li⁺ and containing, by cationic %,

• • 10 to 45% of P⁵⁺,
  • 5 to 30% of Al³⁺,
  • 0 to 20% of Mg²⁺,
  • 0 to 25% of Ca²⁺,
  • 0 to 30% of Sr²⁺,
  • 0 to 33% of Ba²⁺,
  • 1 to 30% of Li⁺,
  • 0 to 10% of Na⁺,
  • 0 to 10% of K⁺,
  • 0 to 5% of Y³⁺,

and

0 to 15% of B³⁺,

the molar ratio of the content of F⁻ to the total content of F⁻ and O²⁻, F⁻/(F⁻+O²⁻), being 0.25 to 0.85,

the optical glass having a refractive index (N_d) of 1.40 to 1.58 and an Abbe's number (ν_d) of 67 to 90.

The present invention provides a fluorophosphate glass containing phosphorus, oxygen and fluorine as glass ingredients, in which, provided that a refractive index nd of the glass is nd⁽¹⁾ and a refractive index nd after re-melting the glass at 900° C. for 1 hour in a nitrogen atmosphere, cooling the glass to a glass transition temperature and then cooling the glass down to 25° C. at a temperature decrease rate of 30° C. per hour is nd⁽²⁾, an absolute value of a difference between nd⁽¹⁾ and nd⁽²⁾ (nd⁽²⁾-nd⁽¹⁾) is equal to or less than 0.00300, and a molar ratio (O²⁻/P⁵⁺) of a content of O²⁻ to a content of P⁵⁺ is equal to or more than 3.5. The glass of the invention is reduced in volatility and erosiveness.

The present invention provides a fluorophosphate glass containing more than 3 cationic % and 30 cationic % or less of a phosphorus ingredient in terms of P⁵⁺, the glass having a ratio I⁽¹⁾/I⁽⁰⁾ of equal to or less than 0.08 in which I⁽⁰⁾ is a strength of a resonance peak generated near a reference frequency of ³¹P in a nuclear magnetic resonance spectrum and I⁽¹⁾ is a strength of a first-order side band peak of the resonance peak. The glass of the invention is reduced in volatility and erosiveness.

Glass having an optimized degree of cross-linking of the phosphate component in the glass matrix is provided so that excellent weatherability is achieved. These glasses are fluorophosphate glasses that contain copper oxide as colouring component. The glasses can further contain colouring components and are obtainable in a method that includes a bubbling step.

The invnetion provides fluoroposphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same. A fluorophosphate glass of the invention contains 30 to 50 cationic % of a phosphorus ingredient in terms of P5+, the glass having, in a nuclear magnetic resonance spectrum, a resonance spectrum which is generated near a reference frequency of 31P and has a shape of Gaussian function. The glass of the invention is reduced in volatility and erosiveness.

To provide a near infrared cutoff filter at low costs, which is useful as cover glass for a solid state imaging sensor package, by providing a thin film attenuation layer for effectively shielding α rays emitted from substrate glass in a form not to influence the optical characteristics. A near infrared cutoff filter comprising substrate glass made of fluorophosphate glass containing CuO or phosphate glass containing CuO, and a thin film attenuation layer formed on at least one light-permeable surface of the substrate glass to attenuate α rays emitted from the substrate glass.

A lens formed of a fluorophosphate glass, which has an optical-function surface and has a positioning reference surface for positioning and fixing the lens in the fixing tool (and also for determining the direction in the direction of the optical axis), so that the above optical-function surface is not damaged, both the optical-function surface and the positioning reference surface being transfer surfaces formed by the transfer of form of a molding surface of a mold according to precision press-molding.

The invention discloses a fluorophosphate glass, a glass preform, an optical element, and an optical instrument provided with the optical element. The fluorophosphate glass comprises cations and anions, and the cations comprise 25-40 mol% of P<5+>, 8-22 mol% of Al<3+>, 0-8 mol% of La<3+>, 1-10 mol% of Y<3+>, 3-15 mol% of Sr<2+>, 25-40 mol% of Ba<2+> and 1-10 mol% of Gd<3+>; and the anions comprise38-50 mol% of F<-> and 50-62 mol% of O<2->, wherein a ratio of n(Y<3+> + La<3+>)/n(P<5+> + Al<3+> + Sr<2+> + Y<3+>) is more than 0.07. The fluorophosphate glass has a refractive index of 1.52-1.60 and an Abbe number of 68 or more, and has excellent optical properties and a low refractive index high temperature coefficient, so the fluorophosphate glass has an excellent thermal stability under strong light, and the stress is not prone to be generated in the glass, thereby the quality of the imaged image is improved, and the needs of the market are met.

PROBLEM TO BE SOLVED: To provide a method for manufacturing optical glass, wherein an amount of a platinum or platinum-alloy foreign matter contained in glass is reduced to reduce the amount of the platinum or platinum-alloy foreign matter deposited in the glass in the case that the optical glass composed of fluorine-containing glass, especially fluorophosphate glass is produced by a melting method.SOLUTION: In the method for manufacturing the optical glass composed of fluorine-containing glass, a glass raw material is dissolved in a vessel made of carbon or a carbide and thereafter, melted in a vessel made of platinum or a platinum-alloy.

The invention discloses a fluorophosphate glass, a glass preform, an optical element, and an optical instrument provided with the optical element. The fluorophosphate glass comprises cations and anions, and the cations comprise 25-40 mol% of P<5+>, 8-22 mol% of Al<3+>, 1-30 mol% of Ln<3+> and 25-55 mol% of R<2+>, wherein the Ln<3+> is at least one La<3+>, Gd<3+>, Y<3+> and Yb<3+>, and the R<2+> isat least one of Ba<2+>, Ca<2+>, Sr<2+> and Mg<2+> and the anions comprise 38-50 mol% of F<-> and 50-62 mol% of O<2->, wherein a ratio of n(Ln<3+>)/n(R<2+>) is more than 0.11. The fluorophosphate glass has a refractive index of 1.52-1.60 and an Abbe number of 68 or more, and has excellent optical properties and a low refractive index high temperature coefficient, so the fluorophosphate glass is suitable for the outdoor high temperature environment, and meets the needs of the market.

A glass wafer is provided that is made of a copper ions containing phosphate or fluorophosphate glass. The glass wafer has a diameter greater than 15 centimeters and a thickness of less than 0.4 millimeters. The glass wafer has two plane-parallel surfaces at least one of which is polished.

The invention discloses a method for treating the surface of fluorphosphate glass. The method is used for treating the surface of glass by adopting the manner of combination of chemical corrosion and mechanical polishing. According to the method, a crack layer as well as impurities accumulated at scratches, which is caused by machining the fluorphosphate glass, can be effectively eliminated, the surface defects are reduced, and the roughness of the surface of the glass is reduced. The method comprises the following concrete steps: firstly, cleaning impurities, which are accumulated on the surface, with mixed acid to expose the scratches on the surface layer; secondly, corroding the surface of the glass with alkali liquor to remove a microcrack layer and the scratches; finally, performing secondary polishing to enable the surface of the glass to be transparent and smooth. The method has the advantages that the impurities and the crack layer, which are arranged on the surface of the glass, are respectively removed by a mixed acid solution and a mixed base solution, and the roughness of the surface of the glass can be reduced.