US20030211929A1 - Optical glass for precision press molding, preform for precision press molding, and process for the production thereof - Google Patents

Optical glass for precision press molding, preform for precision press molding, and process for the production thereof Download PDF

Info

Publication number
US20030211929A1
US20030211929A1 US10/386,102 US38610203A US2003211929A1 US 20030211929 A1 US20030211929 A1 US 20030211929A1 US 38610203 A US38610203 A US 38610203A US 2003211929 A1 US2003211929 A1 US 2003211929A1
Authority
US
United States
Prior art keywords
glass
optical
preform
press molding
precision press
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/386,102
Other languages
English (en)
Inventor
Kazutaka Hayashi
Xuelu Zou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
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 as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoya Corp filed Critical Hoya Corp
Assigned to HOYA CORPORATION reassignment HOYA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAYASHI, KAZUTAKA, ZOU, XUELU
Publication of US20030211929A1 publication Critical patent/US20030211929A1/en
Priority to US11/451,421 priority Critical patent/US20060234850A1/en
Priority to US12/007,080 priority patent/US7560405B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/005—Pressing under special atmospheres, e.g. inert, reactive, vacuum, clean
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • B29C2043/3618—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices plurality of counteracting elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/02—Press-mould materials
    • C03B2215/05—Press-mould die materials
    • C03B2215/07—Ceramic or cermets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/66—Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type

Definitions

  • the present invention relates to an optical glass for precision press molding, a preform for precision press molding, an optical element, and processes for the production of the preform and the optical element. More specifically, the present invention relates to a high-refractivity low-dispersion optical glass which does not require machining of an optical-function surface such as polishing or lapping after precision press molding thereof and which is used for producing an optical element such as an ultra-precision aspherical lens, a precision press molding preform made of the optical glass, an optical element made of the same, and processes for the production of the above preform and optical element.
  • Precision press molding of glass is a technique of shaping a glass preform under pressure at a high temperature into a glass shaped article having a form and a surface accuracy of an end article or a form and a surface accuracy very close to those of an end article.
  • the above precision press molding enables the highly productive production of shaped articles (molded articles) having a desired form.
  • the precision press molding is employed to produce optical parts such as spherical lenses, aspherical lenses and diffraction gratings, and the like.
  • compositions that can attain a refractive index nd>1.8 and an Abbe's number ⁇ d>35 very useful for optical designing contain almost no ZnO or Li 2 O that is said to be effective for decreasing the glass transition temperature, so that they have poor suitability to press molding.
  • a glass having such optical constants has a large content of rare earth metal oxide component and has a low degree of stabilization against devitrification, so that it has been difficult to develop a composition that makes it possible to decrease the glass transition temperature to a region in which the glass can be press molded economically.
  • the present inventors have made diligent studies and as a result, it has been found that the above object can be achieved by an optical glass containing specific components as essential components and having a glass transition temperature of a specific value or smaller and specific optical constants. On the basis of the finding, the present invention has been completed.
  • optical glass I an optical glass for precision press molding
  • optical glass I comprising B 2 O 3 , SiO 2 , La 2 O 3 , Gd 2 O 3 , ZnO, Li 2 O, ZrO 2 and Ta 2 O 5 as essential components, containing 0 to 1 mol % of Sb 2 O 3 as an optional component, substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd and an Abbe's number ⁇ d which satisfy all of the following relational expressions,
  • optical glass II an optical glass for precision press molding
  • optical glass II comprising B 2 O 3 , SiO 2 , La 2 O 3 , Gd 2 O 3 , ZnO, Li 2 O, ZrO 2 and Ta 2 O 5 as essential components, containing 0 to 1 mol % of Sb 2 O 3 as an optional component, substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd of greater than 1.85 and an Abbe's number ⁇ d of greater than 35,
  • an optical glass (to be referred to as “optical glass III” hereinafter) comprising, as essential components and by mol %, 15 to 40% of B 2 O 3 , 3 to 25% of SiO 2 , 5 to 20% of La 2 O 3 , 5 to 20% of Gd 2 O 3 , 2 to 35% of ZnO, 0.5 to 15% of Li 2 O, 0.5 to 15% of ZrO 2 and 0.2 to 10% of Ta 2 O 5 , containing 0 to 15% of WO 3 , 0 to 8% of Y 2 O 3 , 0 to 8% of Yb 2 O 3 and 0 to 1% of Sb 2 O 3 as optional components, and further containing Nb 2 O 5 , BaO and GeO 2 as optional components, the total content of the above components being at least 95%, the optical glass substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd and an Abbe's number
  • a process for the production of a preform for precision press molding which comprises flowing a molten glass made of the optical glass recited in any one of the above (1) to (4) from a flow pipe, isolating molten glass having a predetermined weight, and shaping the isolated molten glass having the predetermined weight while the isolated molten glass is in a softened state, and
  • FIG. 1 is a graph showing a range of the refractive index nd and Abbe's number ⁇ d that one embodiment of the optical glass of the present invention has.
  • FIG. 2 is a schematic cross-sectional view of one example of a precision press molding apparatus used in Examples.
  • the “press molding” in the present invention refers to a press molding method in which a glass material is heated to bring it into a press-moldable state, and press-shaping the glass material into a product by means of a press mold thereby to precisely transfer a molding surface of the press mold to the glass material that is in the above state, whereby the product (end article) can be produced without applying machining such as polishing and lapping, etc., to the molded product after the press molding.
  • the press molding is generally applied to the formation of optical elements (e.g., a lens, prism, and the like).
  • the molding surface of a press mold is precisely transferred thereby to form an optical-function surface (a surface that performs an optical function like a surface which transmits or reflects light (beam) to be controlled in an optical element), so that the thus-formed optical-function surface can be allowed to exhibit performances as an optical-function surface without machining the optical-function surface after the press molding.
  • the method of press-molding an optical element by the above method is generally called “mold optics shaping”, and the method of precision press molding of an aspherical lens is particularly an excellently productive method since it is not required to polish or lap an optical-function surface into an aspherical surface.
  • the precision press molding is a method in which an article required to have a high surface accuracy and internal quality such as an optical element can be mass-produced highly productively.
  • the glass to which the above method can be applied is limited to a glass that can undergo plastic deformation at a relatively low temperature.
  • the molding surface of a press-shaping mold is exposed to a high temperature during the precision press molding, so that the above molding surface is intensely worn or broken.
  • the glass transition temperature of the glass that is usable is therefore limited to 630° C. or lower.
  • the optical glass of the present invention includes three embodiments, the optical glass I, the optical glass II and the optical glass III.
  • the optical glass I will be explained first.
  • the optical glass I of the present invention is an optical glass containing B 2 O 3 , SiO 2 , La 2 O 3 , Gd 2 O 3 , ZnO, Li 2 O, ZrO 2 and Ta 2 O 5 as essential components, containing 0 to 1 mol % of Sb 2 O 3 as an optional component, substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd and an Abbe's number ⁇ d which satisfy all of the following relational expressions,
  • the glass transition temperature of the optical glass I is limited to 630° C. or lower is as already explained. Further, the optical glass I is required to be a high-refractivity low-dispersion optical glass having a refractive index nd and an Abbe's number ⁇ d which satisfy all of the above three relational expressions.
  • nd and ⁇ d exist in a region that is indicated by slanting lines but does not include nd 1.80 and ⁇ d 35.
  • the axis of abscissas shows Abbe's number ⁇ d
  • the axis of ordinates shows a refractive index nd.
  • the contents of the essential components in the above optical glass I are not specially limited so long as there can be obtained an optical glass having a glass transition temperature of 630° C. or lower and having an refractive index nd and an Abbe's number ⁇ d which satisfy all of the above three relational expressions.
  • the contents of the essential components are preferably the same as those in the optical glass III to be described later. The function of each essential component will be explained later with regard to the optical glass III.
  • Sb 2 O 3 as an optional component is used as an refining agent, and when it is used in an amount of 1 mol % or less, a sufficient effect can be obtained. Further, when the content of Sb 2 O 3 is large, the molding surface of the press-shaping mold may be damaged during precision press molding. The content of Sb 2 O 3 is therefore limited to 1 mol % or less.
  • the optical glass I substantially contains none of PbO and Lu 2 O 3 .
  • the above “substantially containing none of PbO and Lu 2 O 3 ” means that the optical glass I contains none of these substances that are intentionally incorporated other than those included as impurities.
  • the precision press molding is carried out in a non-oxidizing atmosphere such as a nitrogen atmosphere for protecting the molding surface of a press-shaping mold.
  • PbO is a component that can be easily reduced, so that the surface of a molded product comes to be cloudy due to a deposit formed by reduction during the precision press. Further, since PbO is environmentally detrimental, PbO is excluded. Lu 2 O 3 is not generally frequently used as a component for a glass as compared with other components.
  • Lu 2 O 3 is a substance having a high scarcity value and is expensive for a raw material for an optical glass, so that it is not any component whose use is desirable.
  • the optical glass I of the present invention has stability as a glass having the above properties, so that an unnecessary Lu 2 O 3 is excluded.
  • the optical glass II of the present invention is a glass containing B 2 O 3 , SiO 2 , La 2 O 3 , Gd 2 O 3 , ZnO, Li 2 O, ZrO 2 and Ta 2 O 5 as essential components, containing 0 to 1 mol % of Sb 2 O 3 as an optional component, substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd of greater than 1.85 and an Abbe's number ⁇ d of greater than 35.
  • the glass transition temperature of the optical glass II is limited to 630° C. or lower is as already explained. Further, the optical glass II is required to be a high-refractivity low-dispersion glass having a refractive index nd of greater than 1.85 and an Abbe's number ⁇ d of greater than 35.
  • the contents of the essential components in the above optical glass II are not specially limited so long as there can be obtained an optical glass having a glass transition temperature of 630° C. or lower and having an refractive index nd of greater than 1.85 and an Abbe's number ⁇ d of greater than 35.
  • the contents of the essential components are preferably the same as those in the optical glass III to be described later. The function of each essential component will be explained later with regard to the optical glass III.
  • Sb 2 O 3 as an optional component in the optical glass II is as explained with regard to the above optical glass I.
  • the optical glass II substantially contains none of PbO and Lu 2 O 3 . These components are also as explained with regard to the above optical glass I.
  • the optical glass III of the present invention is an optical glass containing, as essential components and by mol %, 15 to 40% of B 2 O 3 , 3 to 25% of SiO 2 , 5 to 20% of La 2 O 3 , 5 to 20% of Gd 2 O 3 , 2 to 35% of ZnO, 0.5 to 15% of Li 2 O, 0.5 to 15% of ZrO 2 and 0.2 to 10% of Ta 2 O 5 , containing 0 to 15% of WO 3 , 0 to 8% of Y 2 O 3 , 0 to 8% of Yb 2 O 3 and 0 to 1% of Sb 2 O 3 as optional components, further containing Nb 2 O 5 , BaO and GeO 2 as optional components, the total content of the above components being at least 95%, the optical glass substantially containing none of PbO and Lu 2 O 3 , having a glass transition temperature of 630° C. or lower, and having a refractive index nd and an Abbe's number ⁇ d which satisfy all of the following relational
  • the glass transition temperature of the optical glass III is limited to 630° C. or lower is as already explained. Further, the optical glass III is required to be a high-refractivity low-dispersion glass having optical constants, refractive index nd and Abbe's number ⁇ d, which satisfy all of the above three relational expressions.
  • B 2 O 3 is a network-forming oxide and an essential component in the optical glass (I, II and III) of the present invention. Particularly when a high-refractivity component such as La 2 O 3 or Gd 2 O 3 is incorporated in a large amount, it is required to use B 2 O 3 as a main network-forming component for forming a glass. However, the content of B 2 O 3 exceeds 40%, the refractive index of the glass is decreased, and the glass obtained is not suitable for obtaining a high-refractivity glass. When it is less than 15%, the glass has no sufficient stability against devitrification, and the meltability of the glass decreases, so that the content of B 2 O 3 is preferably 15 to 40%, more preferably 20 to 37%.
  • SiO 2 is a component for forming a glass network like B 2 O 3 , and when a small amount of SiO 2 is incorporated into a glass containing a large amount of La 2 O 3 and Gd 2 O 3 as a substitute for part of B 2 O 3 that is a main component, SiO 2 causes the liquidus temperature of the glass to decrease, improves the glass in high-temperature viscosity and greatly improves the glass in stability. When the content of SiO 2 is less than 3%, the above effects are hardly produced. When the content of SiO 2 exceeds 25%, the refractive index of the glass decreases, and further, the glass transition temperature increases, so that precision press molding of the glass is difficult.
  • the content of SiO 2 is therefore preferably in the range of 3 to 25%, more preferably in the range of 5 to 20%.
  • La 2 O 3 is an essential component that causes the refractive index to increase and improves the chemical durability of the glass without decreasing the stability of the glass against devitrification and without increasing the dispersion.
  • the content of La 2 O 3 is therefore preferably in the range of 5 to 20%, more preferably in the range of 7 to 18%.
  • Gd 2 O 3 works to improve the glass in refractivity and chemical durability without deteriorating the stability of the glass against devitrification and the low dispersion of the glass.
  • the content of Gd 2 O 3 is therefore preferably in the range of 5 to 20%, more preferably 6 to 18%, still more preferably 7 to 18%.
  • the total content of La 2 O 3 +Gd 2 O 3 is adjusted preferably to at least 12%, more preferably to 12 to 32%, for maintaining high functionality of high-refractivity and low-dispersion (refractive index nd>1.8 and Abbe's number ⁇ d>35).
  • the glass for precision press molding it is required to incorporate Li 2 O and the like, components that impart the glass with precision press molding suitability, i.e., a low glass transition temperature but destabilize the glass.
  • the content of the lanthanoid oxides essential for high refractivity and low dispersion is increased, molding of the glass comes to be impossible.
  • the amount ( ⁇ Ln 2 O 3 ) is therefore limited.
  • Lanthanoid oxides other than La 2 O 3 are added such that the ratio of the content of La 2 O 3 to the total content of lanthanoid oxides Ln 2 O 3 is 0.35 to 0.66, whereby a stable glass can be obtained while increasing the amount of the lanthanoid oxides, and the glass containing Li 2 O, etc., components that decrease the stability of the glass can be molded as a glass. Further, it has been found that maintaining the above ratio serves to decrease the liquidus temperature and to improve the high-temperature viscosity.
  • ZnO is an essential component that decreases the melting temperature, liquidus temperature and glass transition temperature of the glass and is indispensable for the adjustment of a refractive index.
  • the content of ZnO is preferably in the range of 2 to 35%, more preferably in the range of 5 to 32%.
  • Li 2 O is a component that decreases the glass transition temperature to a great extent without involving a great decrease in refractive index or a decrease in chemical durability, as compared with any other alkali metal oxide component. Particularly, when Li 2 O is incorporated in a small amount, the effect thereof is large for its amount, and it is effective for adjusting thermal properties of the glass. When the content of Li 2 O is less than 0.5%, it produces little effect. When it exceeds 15%, the stability of the glass against devitrification sharply decreases, and the liquidus temperature of the glass also increases.
  • the content of Li 2 O is therefore preferably in the range of 0.5 to 15%, more preferably 1 to 12%, still more preferably 2 to 12%.
  • Both ZnO and Li 2 O are components that decrease the glass transition temperature, so that the total content of ZnO+Li 2 O is preferably adjusted to at least 10 mol %, more preferably to at least 15 mol %.
  • ZrO 2 is incorporated as a component for attaining high-refractivity and low-dispersion properties.
  • a small amount of ZrO 2 When a small amount of ZrO 2 is incorporated, it has the effect of improving the high-temperature viscosity and the stability against devitrification, so that it is preferred to incorporate a small amount of ZrO 2 .
  • the content of ZrO 2 When the content of ZrO 2 is less than 0.5%, it produces little effect. When the content thereof exceeds 15%, the liquidus temperature sharply increases, and the stability against devitrification is deteriorated. Therefore, the content of ZrO 2 is preferably in the range of 0.5 to 15%, more preferably 1 to 10%.
  • Ta 2 O 5 is incorporated as a component for attaining high-refractivity and low-dispersion properties.
  • a small amount of Ta 2 O 5 When a small amount of Ta 2 O 5 is incorporated, it has the effect of improving the glass in high-temperature viscosity and stability against devitrification, so that it is preferred to incorporate a small amount of Ta 2 O 5 .
  • the content of Ta 2 O 5 is less than 0.2%, it produces no effect.
  • it exceeds 10% the liquidus temperature sharply increases, and the dispersion becomes large. Therefore, the content of Ta 2 O 5 is preferably in the range of 0.2 to 10%, more preferably 1 to 8%.
  • WO 3 is a component that is incorporated as required for improving the glass in stability and meltability and improving the glass in refractivity.
  • the content of WO 3 exceeds 15%, the dispersion becomes large, and the necessary low-dispersion property can be no longer obtained. Therefore, the content of WO 3 is preferably 15% or less, more preferably 12% or less.
  • Y 2 O 3 , Yb 2 O 3 and BaO are incorporated as component for attaining high-refractivity and low-dispersion properties. When it is incorporated in a small amount, it improves the glass in stability and chemical durability. When the content of each of individual components exceeds 8%, any one of these impairs the stability of the glass against devitrification to a great extent and increases the glass transition temperature and sag temperature. Each component is therefore preferably controlled such that the content thereof is 8% or less, more preferably, 7% or less.
  • Nb 2 O 5 is a component that is incorporated as required for improving the glass in stability and refractivity. When the content thereof exceeds 8%, the dispersion becomes large, and the necessary low-dispersion property can be no longer obtained. Therefore, the content of Nb 2 O 5 is preferably 8% or less, more preferably, 5% or less.
  • GeO 2 is a component that stabilizes the glass like SiO 2 and imparts the glass with a higher refractive index than SiO 2 does.
  • GeO 2 is expensive and increases the dispersion, so that the content of GeO 2 is preferably 8% or less.
  • the optical glass has a composition containing the above optional components in the above amounts as required, there can be obtained an optical glass having qualities and properties that are explained to be preferred.
  • the optical glass more preferably has a glass composition containing 20 to 37% of B 2 O 3 , 5 to 20% of SiO 2 , 7 to 18% of La 2 O 3 , 6 to 18% of Gd 2 O 3 , 5 to 32% of ZnO, 1 to 12% of Li 2 O, 1 to 10% of ZrO 2 , 1 to 8% of Ta 2 O 5 , 0 to 12% of WO 3 , 0 to 7% of Y 2 O 3 , 0 to 7% of Yb 2 O 3 , 0 to 5% of Nb 2 O 5 , 0 to 7% of BaO, 0 to 8% of GeO 2 and 0 to 1% of Sb 2 O 3 , the total content of La 2 O 3 and Gd 2 O 3 being 12 to 32%, La 2 O 3 / ⁇ Ln 2 O 3 being 12 to 3
  • the optical glass more preferably has a glass composition containing 20 to 37% of B 2 O 3 , 5 to 20% of SiO 2 , 7 to 18% of La 2 O 3 , 7 to 18% of Gd 2 O 3 , 5 to 32% of ZnO, 2 to 12% of Li 2 O, 1 to 10% of ZrO 2 , 1 to 8% of Ta 2 O 5 , 0 to 12% of WO 3 , 0 to 7% of Y 2 O 3 , 0 to 7% of Yb 2 O 3 , 0 to 5% of Nb 2 O 5 , 0 to 7% of BaO, 0 to 8% of GeO 2 and 0 to 1% of Sb 2 O 3 , the total content of La 2 O 3 and Gd 2 O 3 being 12 to 32%, La 2 O 3 / ⁇ Ln 2 O 3 being 0.45 to 0.66.
  • the total content of the above components is at least 95% for obtaining the desired optical properties and at the same time for maintaining the stability of the glass.
  • the optical glass may contain other components such as Na 2 O, K 2 O, CaO, SrO, TiO 2 , Al 2 O 3 , Ga 2 O 3 , and the like in a total content of 5% or less for adjusting properties of the glass.
  • the total content of B 2 O 3 , SiO 2 , ZnO, Li 2 O, La 2 O 3 , Gd 2 O 3 , ZrO 2 , Ta 2 O 5 , WO 3 , Y 2 O 3 and Yb 2 O 3 is at least 95%, and more preferably, the above total content is at least 99%. Still more preferably, the above total content is 100%.
  • the optical glass (any one of the optical glasses I, II and III) of the present invention does not contain any environmentally detrimental elements such as cadmium, radioactive elements such as thorium or toxic elements such as arsenic. Further, desirably, they do not contain any fluorine in view of volatilization during melting of the glass.
  • optical glass any one of the optical glasses I, II and III
  • the optical glass (any one of the optical glasses I, II and III) of the present invention can be produced, for example, by formulating material compounds and melting, refining, stirring and homogenizing the formulated glass material according to a conventional method.
  • a glass melt that gives any one of the optical glasses (I, II and III) of the present invention is allowed to flow into a 40 ⁇ 70 ⁇ 15 mm mold made of carbon, allowed to gradually cool to a glass transition temperature, then annealed at the glass transition temperature for 1 hour and allowed to cool to room temperature to obtain a glass. In this case, there is precipitated no crystal that is observable through a microscope.
  • the optical glass (any one of the optical glasses I, II and III) of the present invention is excellent in stability.
  • the optical glass of the present invention is transparent in a visible light region and suitable for producing a lens, a prism and other optical elements.
  • a precision press molding preform made of the optical glass (any one of the optical glasses I, II and III) of the present invention and a method of preparing the same will be explained below.
  • the precision press molding preform refers to a pre-shaped glass material to be precision press molded under heat.
  • the precision press molding is a method in which an optical-function surface is formed by press molding, whereby an optical element as an end article (final product) is produced without any polishing or lapping.
  • the weight of the preform is adjusted such that it is equivalent to the weight of an end article (final product) .
  • the weight of a precision press molded article is also equivalent to this weight.
  • the glass is not fully charged in the molding surface of a press-shaping mold during its precision press molding, and there is caused a problem that no intended surface accuracy can be obtained or that the thickness of a molded article is smaller than an intended thickness. Further, when the weight of a preform is larger than the weight of an end precision press molded article, there is caused a problem that excess glass penetrate gaps of precision press mold members to form burrs, or that a molded article has a larger thickness than an intended thickness. It is therefore required to control the weight of a precision press molding preform more accurately than the weight of any general press molding glass material that is finished by polishing or lapping after press molded. In the precision press molding preform, further, the surface of the preform is left on an end article as a press molded article surface, so that the surface of the preform is required to be free of a flaw and soiling.
  • the method for producing the above precision press molding preform includes a method in which a molten glass is allowed to flow, a molten glass gob having a predetermined weight is separated, and the molten glass gob is shaped into a preform (to be referred to as “hot shaping method” hereinafter) and a method in which a molten glass is cast into a mold, a shaped glass is cooled, and the obtained glass gob is machined to a predetermined size (to be referred to as “cold shaping method” hereinafter).
  • a molten glass which is prepared by melting, clarification and homogenization and which has, for example, a temperature of approximately 1,000 to 1,400° C. and a viscosity of approximately 0.1 to 5 dPa ⁇ s is prepared, the temperature of the above molten glass is adjusted such that the molten glass has a viscosity of approximately 3 to 60 dPa ⁇ s, and the molten glass is allowed to flow out of a flow nozzle or a flow pipe, to shape it into a preform.
  • the method of adjusting the above temperature includes, for example, a method in which the temperature of the flow nozzle or the flow pipe is controlled.
  • the flow nozzle or flow pipe is desirably made of platinum or a platinum alloy.
  • the method of shaping the molten glass into a preform specifically includes a method in which molten glass is dropped from the flow nozzle as a molten glass drop having a predetermined weight and the molten glass drop is received with a receiving member and shaped into a preform, a method in which the above molten glass drop having a predetermined weight is dropped from the above flow nozzle into liquid nitrogen and shaped into a preform, and a method in which a molten glass flow is allowed to flow down from the flow pipe made of platinum or a platinum alloy, a forward end portion of the molten glass flow is received with a receiving member, a constricted portion is formed in a molten glass flow portion between the nozzle and the receiving member, molten glass flow is separated in the constricted portion, and a molten glass gob having a predetermined weight is received with the receiving member and shaped into a preform.
  • the glass When the molten glass is dropped, the glass preferably has a viscosity of 3 to 30 dPa ⁇ s. When the molten glass is flowed down as a molten glass flow, the glass preferably has a viscosity of 2 to 60 dPa ⁇ s.
  • the form of the preform can be determined by taking account of the form of precision press molded article.
  • Examples of the form of the preform preferably include a spherical form and an oval form.
  • a preform having a smooth surface can be easily obtained since the surface of the preform is formed when the glass has a softening temperature or higher.
  • a molten glass gob is shaped into a preform while floated above a shaping mold with air pressure, or a method in which a molten glass gob is placed into, and shaped into a preform in, a medium prepared by cooling a substance that is a gas at an ordinary temperature under ordinary pressure into a liquid, there can be easily produced a preform having a smooth surface free of flaws, soling and surface alteration, for example, a preform having a free surface.
  • the above molten glass prepared by melting, refining and homogenization is cast into a casting mold, shaped into the form of a glass block, the glass block is gradually cooled to decrease strain of the glass, then, the glass block is machined or cut to prepare a glass gob having predetermined dimensions and a predetermined weight, and the glass gob is surface-smoothened to give a preform.
  • the precision press molding uses a press-shaping mold having a molding surface that is accurately processed beforehand so as to have a desired form, and a release film may be formed on the molding surface for preventing the fusion of the glass during pressing.
  • the precision press molding can be carried out by a known method including precision press molding in an atmosphere of a non-oxidizing gas such as nitrogen gas for preventing damage of the molding surface, such as damage by oxidation.
  • various lenses such as a spherical lens, an aspherical lens, a micro lens, a lens array, a micro lens array, etc., and optical elements such as a prism, a polygonal mirror, etc., can be produced from the optical glass (any one of the optical glasses I, II, and III) of the present invention without machining their optical-function surfaces.
  • the glass melt was allowed to flow into a 40 ⁇ 70 ⁇ 15 mm mold made of carbon and allowed to cool to a glass transition temperature, and immediately thereafter, the glass was placed in an annealing furnace and annealed in a glass transition temperature range for about 1 hour. Then, the glass in the furnace was allowed to cool to room temperature, to give an optical glass. In the thus-obtained optical glasses, there was precipitated no crystal that was observable through a microscope.
  • An optical glass held at a temperature between Tg and Ts was temperature-decreased at a temperature decrease rate of ⁇ 30° C./hour, and the optical glass was measured for a refractive index (nd) and an Abbe's number ( ⁇ d).
  • optical glasses for precision press molding comprising B 2 O 3 , SiO 2 , La 2 O 3 , Gd 2 O 3 , ZnO, Li 2 O, ZrO 2 and Ta 2 O 5 , having a glass transition temperature of 630° C. or lower and having a refractive index nd and an Abbe's number ⁇ d which satisfy all of the following relational expressions,
  • Each of the spherical preforms made of the optical glasses of Examples 1 to 64 obtained by Method 1 in Example 65 was heated and precision press molded (aspherical-precision pressed) with an apparatus shown in FIG. 2, to give aspherical lenses.
  • the preform 4 was placed between a lower mold member 2 and an upper mold member 1 which had an aspherical form and were made of SiC, then the atmosphere inside a quartz tube 11 was replaced with a nitrogen atmosphere inside, and an electric current was applied to heater 12 to heat the inside of the quartz tube 11 .
  • the temperature inside the shaping mold was set at a temperature between a sag temperature of the glass+20° C. and the sag temperature of the glass+80° C., and while this temperature was maintained, a press rod 13 was moved downward to press the upper mold member 1 thereby to press-mold the preform (molding glass gob) in the shaping mold.
  • the press-molding was carried out under a molding pressure of 8 MPa for a molding time period of 30 seconds. After the press-molding, the molding pressure was decreased, and while the press-molded glass molded product was in contact with the lower mold member 2 and the upper mold member 1 , the molded product was gradually cooled to a temperature that was the glass transition temperature ⁇ 30° C. Then, the molded product was rapidly cooled to room temperature. Then, the glass molded as an aspherical lens was taken out of the shaping mold, and subjected to measurement of a form and inspection of an appearance. The thus-obtained aspherical lenses from the optical glasses in Examples 1 to 64 had remarkably high accuracy.
  • numeral 3 indicates a sleeve
  • numeral 9 indicates a support rod
  • numeral 10 indicates a support bed
  • numeral 14 indicates a thermocouple
  • Aspherical lenses made of the optical glasses in Examples 1 to 64 were obtained from the preforms prepared by Methods 2 and 3 in the same manner as above. Like the above spherical lenses, the thus-obtained spherical lenses had remarkably high accuracy. While the preforms used in this Example had the form of a sphere and had a diameter of 2 to 30 mm, the form and dimensions of the preform can be determined as required depending upon the form, etc., of a precision press molded product (article).
  • a press-shaping mold having a form suitable for producing an end product can give other lens or an optical element such as a prism or a polygonal mirror.
  • An anti-reflection film or an optical multi-layered film such as a high reflection film can be formed on the optical-function surface of the thus-obtained optical element as required.
  • a precision press molding optical glass that has high-refractivity and low-dispersion properties and which is usable for the production of an optical element such as an ultra-precision aspherical lens without any machining, polishing or lapping, of the optical-function surface thereof after precision press molding.
  • a precision press molding preform made of the above optical glass and a process for the production thereof
  • an optical element made of the above optical glass and a process for the production of an optical element such as an aspherical lens, or the like, highly productively from the above preform by precision press molding.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Glass Compositions (AREA)
US10/386,102 2002-03-18 2003-03-12 Optical glass for precision press molding, preform for precision press molding, and process for the production thereof Abandoned US20030211929A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/451,421 US20060234850A1 (en) 2002-03-18 2006-06-13 Optical glass for precision press molding, preform for precission press molding, and process for the production thereof
US12/007,080 US7560405B2 (en) 2002-03-18 2008-01-07 Optical glass for precision press molding, preform for precision press molding, and process for the production thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-74322 2002-03-18
JP2002074322A JP3912774B2 (ja) 2002-03-18 2002-03-18 精密プレス成形用光学ガラス、精密プレス成形用プリフォームおよびその製造方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/451,421 Continuation US20060234850A1 (en) 2002-03-18 2006-06-13 Optical glass for precision press molding, preform for precission press molding, and process for the production thereof

Publications (1)

Publication Number Publication Date
US20030211929A1 true US20030211929A1 (en) 2003-11-13

Family

ID=28035296

Family Applications (3)

Application Number Title Priority Date Filing Date
US10/386,102 Abandoned US20030211929A1 (en) 2002-03-18 2003-03-12 Optical glass for precision press molding, preform for precision press molding, and process for the production thereof
US11/451,421 Abandoned US20060234850A1 (en) 2002-03-18 2006-06-13 Optical glass for precision press molding, preform for precission press molding, and process for the production thereof
US12/007,080 Expired - Fee Related US7560405B2 (en) 2002-03-18 2008-01-07 Optical glass for precision press molding, preform for precision press molding, and process for the production thereof

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/451,421 Abandoned US20060234850A1 (en) 2002-03-18 2006-06-13 Optical glass for precision press molding, preform for precission press molding, and process for the production thereof
US12/007,080 Expired - Fee Related US7560405B2 (en) 2002-03-18 2008-01-07 Optical glass for precision press molding, preform for precision press molding, and process for the production thereof

Country Status (3)

Country Link
US (3) US20030211929A1 (ja)
JP (1) JP3912774B2 (ja)
CN (1) CN100352781C (ja)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040106507A1 (en) * 2002-08-20 2004-06-03 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
WO2004054937A1 (ja) * 2002-12-17 2004-07-01 Kabushiki Kaisha Ohara 光学ガラス
US20040186003A1 (en) * 2001-06-06 2004-09-23 Susumu Uehara Optical glass
US20050204776A1 (en) * 2004-03-19 2005-09-22 Hoya Corporation Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the optical element
US20050223743A1 (en) * 2004-04-12 2005-10-13 Kazutaka Hayashi Process for mass-producing optical elements
WO2005102949A2 (en) * 2004-04-26 2005-11-03 Kabushiki Kaisha Ohara Optical glass
US20050247081A1 (en) * 2004-05-10 2005-11-10 Konica Minolta Opto, Inc. Optical glass element and manufacturing method thereof
US20050272589A1 (en) * 2004-06-02 2005-12-08 Kabushiki Kaisha Ohara Optical glass
WO2006093062A1 (en) * 2005-02-28 2006-09-08 Kabushiki Kaisha Ohara Optical glass
US20060234850A1 (en) * 2002-03-18 2006-10-19 Hoya Corporation Optical glass for precision press molding, preform for precission press molding, and process for the production thereof
DE102005020423A1 (de) * 2005-04-29 2006-11-02 Schott Ag Blei- und arsenfreie optische Lanthanboratgläser
US20070032366A1 (en) * 2005-07-29 2007-02-08 Hoya Corporation Optical glass, precision press molding preform and manufacturing method of the same, optical element and manufacturing method of the same
US20070044515A1 (en) * 2005-08-26 2007-03-01 Frank Pfeiffer Process of manufacturing a gob
US20070049483A1 (en) * 2005-08-31 2007-03-01 Hoya Corporation Optical glass, precision press-molding preform, process for the production thereof, optical element and process for the production of the element
US20070230200A1 (en) * 2004-04-29 2007-10-04 Koninklijke Philips Electronics, N.V. Glass Composition for Blue Lamp Bulbs, Use of a Composition for Forming a Bulb, and Automotive Lamp Emitting Blue Light and Including a Such Bulb
US20070232477A1 (en) * 2006-03-28 2007-10-04 Hoya Corporation Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
WO2008016164A1 (en) * 2006-08-01 2008-02-07 Canon Kabushiki Kaisha Optical glass and optical device
EP1950186A1 (en) * 2007-01-24 2008-07-30 Hoya Corporation Optical glass, preform for precision press-molding, optical element, and methods for manufacturing the same
US20080293556A1 (en) * 2007-01-24 2008-11-27 Hoya Corporation Optical glass, preform for precision press-molding, optical element, and methods for manufacturing the same
US20090093357A1 (en) * 2006-06-13 2009-04-09 Asahi Glass Company, Limited Optical glass and lens using the same
US20090124481A1 (en) * 2007-10-12 2009-05-14 Ohara Inc. Optical glass
US20090131240A1 (en) * 2005-10-11 2009-05-21 Ohara Inc. Optical Glass
US20090163345A1 (en) * 2007-12-19 2009-06-25 Matsushita Electric Industrial Co., Ltd Optical glass composition, preform and optical element
US20090176641A1 (en) * 2006-06-21 2009-07-09 Yuta Kobayashi Optical glass, glass molded body, optical device and their production methods
US20100018252A1 (en) * 2006-03-31 2010-01-28 Hoya Corporation Method for manufacturing optical glass element
US20100035744A1 (en) * 2004-03-02 2010-02-11 Hoya Corporation Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof
US20100081555A1 (en) * 2008-09-30 2010-04-01 Hoya Corporation Optical glass
US20100113248A1 (en) * 2008-11-05 2010-05-06 Panasonic Corporation Optical glass composition, preform and optical element
US20100240516A1 (en) * 2007-12-06 2010-09-23 Asahi Glass Company, Limited Optical glass and preforms for precision press molding and optical elements made by using the glass
US20110028300A1 (en) * 2008-01-30 2011-02-03 Xuelu Zou Optical glass
US20110077142A1 (en) * 2009-09-30 2011-03-31 Hoya Corporation Optical glass, press-molding glass material, optical element and process for producing the same
US9156729B2 (en) 2010-10-18 2015-10-13 Ocv Intellectual Capital, Llc High refractive index glass composition
US20160090320A1 (en) * 2014-09-30 2016-03-31 Hoya Corporation Glass, glass material for press molding, optical element blank, and optical element
US9346704B2 (en) 2012-10-19 2016-05-24 Cdgm Glass Co., Ltd. Optical glass

Families Citing this family (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040067904A1 (en) * 2001-12-13 2004-04-08 Soldatenkov Viatcheslav A. Gene therapy for prostate cancer: sensibilization of cells to dna damaging drugs and radiation
WO2004087596A1 (ja) * 2003-03-31 2004-10-14 Nihon Yamamura Glass Co., Ltd. 光学ガラス
JP4993872B2 (ja) * 2004-04-26 2012-08-08 株式会社オハラ 光学ガラス
JP2006016295A (ja) * 2004-06-02 2006-01-19 Ohara Inc 光学ガラス
JP5108209B2 (ja) * 2004-06-02 2012-12-26 株式会社オハラ 光学ガラス
JP4828893B2 (ja) * 2004-08-27 2011-11-30 株式会社オハラ 光学ガラス
JP4350016B2 (ja) * 2004-09-29 2009-10-21 Ｈｏｙａ株式会社 光学ガラス、精密プレス成形用プリフォームとその製造方法、ならびに光学素子とその製造方法
JP2006131450A (ja) * 2004-11-05 2006-05-25 Asahi Glass Co Ltd 光学ガラスおよびレンズ
JP4361004B2 (ja) 2004-11-15 2009-11-11 Ｈｏｙａ株式会社 光学ガラス、精密プレス成形用プリフォームおよびその製造方法ならびに光学素子およびその製造方法
JP4448078B2 (ja) * 2005-09-30 2010-04-07 Ｈｏｙａ株式会社 ガラス製プリフォームの製造方法、ガラス成形体の製造方法および光学素子の生産方法
JP4459178B2 (ja) * 2006-03-02 2010-04-28 Ｈｏｙａ株式会社 精密プレス成形用プリフォームの製造方法および光学素子の製造方法
JP4847769B2 (ja) * 2006-03-24 2011-12-28 Ｈｏｙａ株式会社 光学ガラス、精密プレス成形用プリフォームおよびその製造方法、光学素子およびその製造方法
JP5078272B2 (ja) * 2006-03-31 2012-11-21 株式会社オハラ 光学ガラス
KR20090051095A (ko) * 2006-09-14 2009-05-20 아사히 가라스 가부시키가이샤 광학 유리 및 그것을 이용한 렌즈
CN1935717B (zh) * 2006-10-17 2010-10-06 成都光明光电股份有限公司 高折射率低色散精密压型用光学玻璃
CN103102071B (zh) * 2006-10-24 2017-06-23 株式会社小原 光学玻璃
JP5601557B2 (ja) * 2007-02-28 2014-10-08 日本電気硝子株式会社 光学ガラス
JP5317523B2 (ja) * 2007-04-24 2013-10-16 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5317521B2 (ja) * 2007-04-24 2013-10-16 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5317522B2 (ja) * 2007-04-24 2013-10-16 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5275674B2 (ja) * 2007-04-24 2013-08-28 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5160949B2 (ja) * 2007-12-19 2013-03-13 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5160948B2 (ja) * 2007-12-19 2013-03-13 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5327942B2 (ja) * 2007-12-19 2013-10-30 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5327943B2 (ja) * 2007-12-19 2013-10-30 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5160947B2 (ja) * 2007-12-19 2013-03-13 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
CN101679103B (zh) * 2008-05-30 2013-02-06 Hoya株式会社 光学玻璃、精密模压成形用预成形件、光学元件和它们的制造方法、以及摄像装置
CN101386469B (zh) * 2008-10-16 2011-05-11 成都光明光电股份有限公司 高折射低色散光学玻璃
JP5327954B2 (ja) * 2008-11-05 2013-10-30 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5305436B2 (ja) * 2008-11-05 2013-10-02 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5327953B2 (ja) * 2008-11-05 2013-10-30 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5327955B2 (ja) * 2008-11-05 2013-10-30 パナソニック株式会社 光学ガラス組成物、プリフォーム及び光学素子
JP5678477B2 (ja) * 2009-05-28 2015-03-04 旭硝子株式会社 光学ガラス
JP5917791B2 (ja) * 2009-06-30 2016-05-18 株式会社オハラ 光学ガラス、プリフォーム材及び光学素子
JP5946237B2 (ja) * 2010-07-26 2016-07-06 株式会社オハラ 光学ガラス、プリフォーム材及び光学素子
JP5827067B2 (ja) * 2010-08-23 2015-12-02 株式会社オハラ 光学ガラス及び光学素子
TWI594966B (zh) * 2010-10-08 2017-08-11 Ohara Kk Optical glass, preform and optical element
CN102424523B (zh) * 2011-09-08 2014-06-04 成都光明光电股份有限公司 光学玻璃、模压用预制件及光学元件
JP2012041268A (ja) * 2011-11-14 2012-03-01 Ohara Inc 光学ガラス
JP5596717B2 (ja) * 2012-01-30 2014-09-24 株式会社オハラ 光学ガラス
JP5547777B2 (ja) * 2012-07-17 2014-07-16 Ｈｏｙａ株式会社 ガラス光学素子の製造方法
CN103319086A (zh) * 2013-05-27 2013-09-25 都江堰市嘉杰光学有限责任公司 一种高折射率低分散光学玻璃及其制备方法
CN103449720B (zh) * 2013-08-22 2016-08-17 成都尤利特光电科技股份有限公司 高折射、低色散光学玻璃及其制造方法
TWI743061B (zh) * 2015-11-06 2021-10-21 日商小原股份有限公司 光學玻璃、預成形材及光學元件
CN117105523A (zh) * 2016-09-29 2023-11-24 成都光明光电股份有限公司 光学玻璃、玻璃预制件和光学元件
CN106396369B (zh) * 2016-09-29 2017-12-01 成都光明光电股份有限公司 光学玻璃、玻璃预制件和光学元件
CN109111103A (zh) * 2018-08-17 2019-01-01 成都光明光电股份有限公司 光学玻璃、由其制备而成的玻璃预制件或光学元件及光学仪器
CN109775981B (zh) * 2019-03-28 2022-04-15 成都光明光电股份有限公司 光学玻璃、玻璃预制件、光学元件及光学仪器
CN109970337B (zh) * 2019-04-28 2021-12-07 成都光明光电股份有限公司 光学玻璃、玻璃预制件、光学元件及光学仪器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6413894B1 (en) * 1998-04-30 2002-07-02 Hoya Corporation Optical glass and optical product
US20040235638A1 (en) * 2002-12-17 2004-11-25 Kabushiki Kaisha Ohara Optical glass
US6912093B2 (en) * 2002-12-27 2005-06-28 Hoya Corporation Optical glass, press-molding glass gob and optical element

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5490218A (en) 1977-12-28 1979-07-17 Minolta Camera Kk Optical glass
JPS5678447A (en) 1979-11-29 1981-06-27 Minolta Camera Co Ltd Optical glass
DE3343418A1 (de) * 1983-12-01 1985-06-20 Schott Glaswerke, 6500 Mainz Optisches glas mit brechwerten>= 1.90, abbezahlen>= 25 und mit hoher chemischer bestaendigkeit
JPS62100449A (ja) * 1985-10-24 1987-05-09 Ohara Inc 光学ガラス
JP2875709B2 (ja) * 1993-04-22 1999-03-31 株式会社オハラ 光学ガラス
JP3458461B2 (ja) * 1994-07-07 2003-10-20 株式会社ニコン 光学ガラス
JPH08217484A (ja) 1995-02-13 1996-08-27 Ohara Inc 光学ガラス
JPH10226533A (ja) * 1997-02-10 1998-08-25 Nikon Corp 放射線遮蔽ガラス
JP3377454B2 (ja) * 1998-10-12 2003-02-17 株式会社オハラ モールドプレス用光学ガラス
JP2001130924A (ja) * 1999-10-28 2001-05-15 Hoya Corp 精密プレス成形用ガラス、光学部品およびその製造方法
JP3750984B2 (ja) * 2000-05-31 2006-03-01 Ｈｏｙａ株式会社 光学ガラスおよび光学製品の製造方法
JP4093524B2 (ja) * 2001-02-20 2008-06-04 Ｈｏｙａ株式会社 光学ガラス、プレス成形予備体および光学部品
JP4141739B2 (ja) * 2001-10-22 2008-08-27 株式会社住田光学ガラス 精密プレス成形用光学ガラス
US6977232B2 (en) * 2001-10-24 2005-12-20 Hoya Corporation Optical glass, preform for press molding and optical part
JP4003874B2 (ja) * 2001-10-24 2007-11-07 Ｈｏｙａ株式会社 光学ガラス、プレス成形用プリフォームおよび光学部品
JP3912774B2 (ja) 2002-03-18 2007-05-09 Ｈｏｙａ株式会社 精密プレス成形用光学ガラス、精密プレス成形用プリフォームおよびその製造方法
JP2004175632A (ja) 2002-11-28 2004-06-24 Hikari Glass Co Ltd 光学ガラス
JP4286652B2 (ja) 2002-12-27 2009-07-01 Ｈｏｙａ株式会社 光学ガラス、プレス成形用ガラスゴブおよび光学素子
JP2005015302A (ja) 2003-06-27 2005-01-20 Nippon Electric Glass Co Ltd モールドプレス成形用光学ガラス
JP2005047732A (ja) 2003-07-31 2005-02-24 Minolta Co Ltd 光学ガラス及び光学素子
US20050049135A1 (en) * 2003-08-29 2005-03-03 Kazutaka Hayashi Precision press-molding glass preform, optical element and processes for the production thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6413894B1 (en) * 1998-04-30 2002-07-02 Hoya Corporation Optical glass and optical product
US20040235638A1 (en) * 2002-12-17 2004-11-25 Kabushiki Kaisha Ohara Optical glass
US6912093B2 (en) * 2002-12-27 2005-06-28 Hoya Corporation Optical glass, press-molding glass gob and optical element

Cited By (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040186003A1 (en) * 2001-06-06 2004-09-23 Susumu Uehara Optical glass
US7560405B2 (en) 2002-03-18 2009-07-14 Hoya Corporation Optical glass for precision press molding, preform for precision press molding, and process for the production thereof
US20060234850A1 (en) * 2002-03-18 2006-10-19 Hoya Corporation Optical glass for precision press molding, preform for precission press molding, and process for the production thereof
US20080119348A1 (en) * 2002-03-18 2008-05-22 Hoya Corporation Optical glass for precision press molding, preform for precision press molding, and process for the production thereof
US20040106507A1 (en) * 2002-08-20 2004-06-03 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
US7232779B2 (en) * 2002-08-20 2007-06-19 Hoya Corporation Optical glass, precision press molding preform and method of manufacturing the same, optical element and method of manufacturing the same
US20060229186A1 (en) * 2002-12-17 2006-10-12 Kabushiki Kaisha Ohara Optical glass
US7335614B2 (en) 2002-12-17 2008-02-26 Kabushiki Kaisha Ohara Optical glass
US7138349B2 (en) * 2002-12-17 2006-11-21 Kabushiki Kaisha Ohara Optical glass
US20040235638A1 (en) * 2002-12-17 2004-11-25 Kabushiki Kaisha Ohara Optical glass
WO2004054937A1 (ja) * 2002-12-17 2004-07-01 Kabushiki Kaisha Ohara 光学ガラス
US8466075B2 (en) 2004-02-06 2013-06-18 Kabushiki Kaisha Ohara Optical glass
US20100035744A1 (en) * 2004-03-02 2010-02-11 Hoya Corporation Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof
US7932197B2 (en) 2004-03-02 2011-04-26 Hoya Corporation Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof
US20050204776A1 (en) * 2004-03-19 2005-09-22 Hoya Corporation Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the optical element
US7491667B2 (en) * 2004-03-19 2009-02-17 Hoya Corporation Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the optical element
US20050223743A1 (en) * 2004-04-12 2005-10-13 Kazutaka Hayashi Process for mass-producing optical elements
WO2005102949A3 (en) * 2004-04-26 2006-03-30 Ohara Kk Optical glass
WO2005102949A2 (en) * 2004-04-26 2005-11-03 Kabushiki Kaisha Ohara Optical glass
US20070230200A1 (en) * 2004-04-29 2007-10-04 Koninklijke Philips Electronics, N.V. Glass Composition for Blue Lamp Bulbs, Use of a Composition for Forming a Bulb, and Automotive Lamp Emitting Blue Light and Including a Such Bulb
US7415842B2 (en) * 2004-05-10 2008-08-26 Konica Minolta Opto, Inc. Optical glass element and manufacturing method thereof
US20050247081A1 (en) * 2004-05-10 2005-11-10 Konica Minolta Opto, Inc. Optical glass element and manufacturing method thereof
US20080220961A1 (en) * 2004-06-02 2008-09-11 Ohara, Inc. Optical Glass
EP1604959A1 (en) * 2004-06-02 2005-12-14 Kabushiki Kaisha Ohara An optical glass
US8163665B2 (en) * 2004-06-02 2012-04-24 Ohara, Inc. Optical glass
US20050272589A1 (en) * 2004-06-02 2005-12-08 Kabushiki Kaisha Ohara Optical glass
US7659222B2 (en) 2004-06-02 2010-02-09 Kabushiki Kaisha Ohara Optical glass
CN100393652C (zh) * 2004-06-02 2008-06-11 株式会社小原 光学玻璃
WO2006093062A1 (en) * 2005-02-28 2006-09-08 Kabushiki Kaisha Ohara Optical glass
US20090062101A1 (en) * 2005-02-28 2009-03-05 Kabushiki Kaisha Ohara Optical glass
US8148280B2 (en) * 2005-02-28 2012-04-03 Kabushiki Kaisha Ohara Optical glass
DE102005020423A1 (de) * 2005-04-29 2006-11-02 Schott Ag Blei- und arsenfreie optische Lanthanboratgläser
US20060247119A1 (en) * 2005-04-29 2006-11-02 Ritter Simone M Lead and arsenic free optical lanthanum borate glass
DE102005020423B4 (de) * 2005-04-29 2009-04-02 Schott Ag Blei- und arsenfreies optisches Lanthanboratglas und dessen Verwendung
US7638450B2 (en) 2005-04-29 2009-12-29 Schott Ag Lead and arsenic free optical lanthanum borate glass
US20070032366A1 (en) * 2005-07-29 2007-02-08 Hoya Corporation Optical glass, precision press molding preform and manufacturing method of the same, optical element and manufacturing method of the same
US7670978B2 (en) * 2005-07-29 2010-03-02 Hoya Corporation Optical glass, precision press molding preform and optical element
DE102005041033B4 (de) * 2005-08-26 2010-10-28 Schott Ag Verfahren zur Herstellung eines Pressglasproduktes
US20070044515A1 (en) * 2005-08-26 2007-03-01 Frank Pfeiffer Process of manufacturing a gob
DE102005041033A1 (de) * 2005-08-26 2007-03-01 Schott Ag Verfahren zur Herstellung eines Pressglasproduktes
US20070049483A1 (en) * 2005-08-31 2007-03-01 Hoya Corporation Optical glass, precision press-molding preform, process for the production thereof, optical element and process for the production of the element
US7655585B2 (en) * 2005-08-31 2010-02-02 Hoya Corporation Optical glass, precision press-molding preform, process for the production thereof, optical element and process for the production of the element
US8110515B2 (en) * 2005-10-11 2012-02-07 Ohara, Inc. Optical glass
US20090131240A1 (en) * 2005-10-11 2009-05-21 Ohara Inc. Optical Glass
US8748328B2 (en) 2006-03-28 2014-06-10 Hoya Corporation Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
US8039408B2 (en) * 2006-03-28 2011-10-18 Hoya Corporation Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
US8349749B2 (en) 2006-03-28 2013-01-08 Hoya Corporation Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
US20070232477A1 (en) * 2006-03-28 2007-10-04 Hoya Corporation Optical glass, preform for precision press molding, optical element and method of manufacturing thereof
US20100018252A1 (en) * 2006-03-31 2010-01-28 Hoya Corporation Method for manufacturing optical glass element
US8826695B2 (en) 2006-03-31 2014-09-09 Hoya Corporation Method for manufacturing optical glass element
US20090093357A1 (en) * 2006-06-13 2009-04-09 Asahi Glass Company, Limited Optical glass and lens using the same
US8575049B2 (en) 2006-06-21 2013-11-05 Hoya Corporation Optical glass, glass molded body, optical device and their production methods
US20090176641A1 (en) * 2006-06-21 2009-07-09 Yuta Kobayashi Optical glass, glass molded body, optical device and their production methods
US8263510B2 (en) * 2006-06-21 2012-09-11 Hoya Corporation Optical glass, glass molded body, optical device and their production methods
WO2008016164A1 (en) * 2006-08-01 2008-02-07 Canon Kabushiki Kaisha Optical glass and optical device
US20090312172A1 (en) * 2006-08-01 2009-12-17 Canon Kabushiki Kaisha Optical glass and optical device
US7855158B2 (en) * 2007-01-24 2010-12-21 Hoya Corporation Optical glass, preform for precision press-molding, optical element, and methods for manufacturing the same
US20080293556A1 (en) * 2007-01-24 2008-11-27 Hoya Corporation Optical glass, preform for precision press-molding, optical element, and methods for manufacturing the same
EP1950186A1 (en) * 2007-01-24 2008-07-30 Hoya Corporation Optical glass, preform for precision press-molding, optical element, and methods for manufacturing the same
US20090124481A1 (en) * 2007-10-12 2009-05-14 Ohara Inc. Optical glass
US8080491B2 (en) * 2007-10-12 2011-12-20 Ohara Inc. Optical glass
US20100240516A1 (en) * 2007-12-06 2010-09-23 Asahi Glass Company, Limited Optical glass and preforms for precision press molding and optical elements made by using the glass
US8361916B2 (en) 2007-12-06 2013-01-29 Asahi Glass Company, Limited Optical glass and preforms for precision press molding and optical elements made by using the glass
US20090163345A1 (en) * 2007-12-19 2009-06-25 Matsushita Electric Industrial Co., Ltd Optical glass composition, preform and optical element
US7897533B2 (en) * 2007-12-19 2011-03-01 Panasonic Corporation Optical glass composition, preform and optical element
US8424344B2 (en) * 2008-01-30 2013-04-23 Hoya Corporation Optical glass
US8741795B2 (en) 2008-01-30 2014-06-03 Hoya Corporation Optical glass
US20110028300A1 (en) * 2008-01-30 2011-02-03 Xuelu Zou Optical glass
US8741796B2 (en) 2008-09-30 2014-06-03 Hoya Corporation Optical glass
US8492299B2 (en) 2008-09-30 2013-07-23 Hoya Corporation Optical glass
US20100081555A1 (en) * 2008-09-30 2010-04-01 Hoya Corporation Optical glass
US8127570B2 (en) * 2008-09-30 2012-03-06 Hoya Corporation Optical glass
US20100113248A1 (en) * 2008-11-05 2010-05-06 Panasonic Corporation Optical glass composition, preform and optical element
US8247336B2 (en) 2008-11-05 2012-08-21 Panasonic Corporation Optical glass composition, preform and optical element
US20110077142A1 (en) * 2009-09-30 2011-03-31 Hoya Corporation Optical glass, press-molding glass material, optical element and process for producing the same
US8859444B2 (en) * 2009-09-30 2014-10-14 Hoya Corporation Optical glass, press-molding glass material, optical element and process for producing the same
US9156729B2 (en) 2010-10-18 2015-10-13 Ocv Intellectual Capital, Llc High refractive index glass composition
US9346704B2 (en) 2012-10-19 2016-05-24 Cdgm Glass Co., Ltd. Optical glass
US20160090320A1 (en) * 2014-09-30 2016-03-31 Hoya Corporation Glass, glass material for press molding, optical element blank, and optical element
US9650285B2 (en) * 2014-09-30 2017-05-16 Hoya Corporation Glass, glass material for press molding, optical element blank, and optical element

Also Published As

Publication number Publication date
US20060234850A1 (en) 2006-10-19
US7560405B2 (en) 2009-07-14
JP3912774B2 (ja) 2007-05-09
US20080119348A1 (en) 2008-05-22
CN1445188A (zh) 2003-10-01
CN100352781C (zh) 2007-12-05
JP2003267748A (ja) 2003-09-25

Similar Documents

Publication Publication Date Title
US7560405B2 (en) Optical glass for precision press molding, preform for precision press molding, and process for the production thereof
US7622409B2 (en) Optical glass, precision press-molding preform, process for production thereof, optical element and process for the production thereof
US7491667B2 (en) Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the optical element
US7827823B2 (en) Optical glass, precision press-molding preform, process for producing the preform, optical element and process for producing the element
US7618909B2 (en) Precision press-molding preform, process for the production thereof, optical element and process for the production of the optical element
US6977232B2 (en) Optical glass, preform for press molding and optical part
US7994082B2 (en) Preforms for precision press molding, optical elements, and methods of manufacturing the same
US7576020B2 (en) Optical glass, precision press-molding preform, process for the production of the preform, optical element and process for the production of the optical element
JP5265593B2 (ja) 光学ガラス、精密プレス成形用プリフォーム、光学素子、それらの製造方法
US7598189B2 (en) Phosphate optical glass, preform for precision press molding and manufacturing method of the same, optical element and manufacturing method of the same
US20060079390A1 (en) Optical glass, preform for precision press-molding, process for the production of the preform, optical element, and process for the production of the element
JP2002362938A (ja) 光学ガラス
EP1433757A1 (en) Optical glass, press-molding glass gob and optical element
US7670978B2 (en) Optical glass, precision press molding preform and optical element
KR20070096852A (ko) 광학 유리, 정밀 프레스 성형 및 그 제조 프로세스, 및광학 소자 및 그 제조 프로세스
US20050143250A1 (en) Optical glass, preform for press molding and optical element
KR100977696B1 (ko) 정밀 프레스 성형 유리 예비성형체, 광학 소자 및 그의제조 방법
JP2004161506A (ja) 光学ガラス、プレス成形用ガラス成形体および光学素子
JP4003874B2 (ja) 光学ガラス、プレス成形用プリフォームおよび光学部品
JP4133975B2 (ja) 精密プレス成形用ガラスプリフォーム、光学素子およよびそれらの製造方法
JP7409629B2 (ja) 光学ガラス、精密プレス成形用プリフォーム、及び光学素子
WO2023136085A1 (ja) 光学ガラス、精密プレス成形用プリフォーム、及び光学素子

Legal Events

Date Code Title Description
AS Assignment

Owner name: HOYA CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAYASHI, KAZUTAKA;ZOU, XUELU;REEL/FRAME:014157/0782

Effective date: 20030317

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION