WO2000021895A1 - Verre optique pour moulage sous pression et element optique - Google Patents
Verre optique pour moulage sous pression et element optique Download PDFInfo
- Publication number
- WO2000021895A1 WO2000021895A1 PCT/JP1999/005565 JP9905565W WO0021895A1 WO 2000021895 A1 WO2000021895 A1 WO 2000021895A1 JP 9905565 W JP9905565 W JP 9905565W WO 0021895 A1 WO0021895 A1 WO 0021895A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- temperature
- optical
- devitrification
- melt
- Prior art date
Links
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S501/00—Compositions: ceramic
- Y10S501/90—Optical glass, e.g. silent on refractive index and/or ABBE number
- Y10S501/903—Optical glass, e.g. silent on refractive index and/or ABBE number having refractive index less than 1.8 and ABBE number less than 70
Definitions
- the present invention relates to a preform material used for a mold press, and an optical glass and an optical element for a mold press suitable for a mold press from the preform material.
- optical elements such as lenses used in optical devices are also required to be lighter, smaller, and have higher performance. Therefore, the use of aspherical lenses is becoming mainstream in the design of various optical devices because the number of lenses used can be reduced by using aspherical lenses.
- the mainstream method of manufacturing aspherical lenses is the so-called mold press, which heats and softens a preform material obtained from a gob or glass block and press-molds it with a high-precision mold. Is coming.
- the feature of this method is that since the step of grinding and polishing the lens after molding can be omitted, optical elements such as lenses can be mass-produced at low cost.
- the mold used for the mold press can be used repeatedly.
- a glass that has low-temperature softening properties that is, a glass with a low glass transition point (T g)
- T g glass transition point
- the maximum temperature of the mold press obtained from the heat-resistant temperature of the mold is 650 to 7
- the upper limit of the glass transition point (Tg) is about 550 to 600 ° C. To prevent the surface oxidation of the mold from progressing and extend the life of the mold, The lower the better.
- glass used for aspheric lenses of optical equipment is required to have various optical constants.
- the refractive index (nd) is 1.65 to 1.73 and the Abbe number (vd ) Is required to have an optical constant of about 50 to 60.
- a glass exhibiting such an optical constant has a typical lanthanum borate composition.
- various glasses are disclosed in Japanese Patent Publication No. 48-61517 and Japanese Patent Application Laid-Open No. 54-3115. Have been. However, these glasses generally have a high glass transition point, and can be said to be unsuitable as mold press glass.
- a method for producing the preform material there is a method in which a glass melt is dropped from the tip of an outflow pipe, the dropped glass is received by a mold or the like, molded, and cooled to obtain a preform material.
- Representative examples of obtaining a preform by this method are described in JP-A-6-122526, JP-A-8-319124, and the like.
- This method has high mass productivity and is currently the least expensive in terms of manufacturing cost.However, since the preform material obtained by this method is spherical or a biconvex lens shape close to the final shape of the lens, it is not suitable for molding. This has the effect that the amount of shape change can be reduced, and the mass productivity of the finally obtained lens itself can be improved.
- the viscosity of the glass melt is too low. If it breaks, it will be difficult to obtain a preform material having a smooth curved surface and a shape close to a spherical or biconvex lens shape.
- the devitrification temperature of glass must be lower than the temperature of the melt during preform material production. That is, if the viscosity of the glass melt is lower than the desired value, it is necessary to lower the temperature in order to increase the viscosity of the glass melt for the above-mentioned reason. If the devitrification temperature is higher than the melt temperature at which the desired viscosity is obtained, when the melt temperature is lowered to the desired viscosity, microcrystals are generated in the melt, and as a result, the preform material is lost. Transparency occurs and cannot be used for optical glass. In particular, such a tendency is remarkable in a glass having a low viscosity.
- the glass melt is devitrified at the tip of the outflow pipe at a temperature at which the preform material becomes viscous so that the preform material can be formed by dripping. Devitrification occurs on the surface and inside of the preform, and the yield of the preform material is significantly reduced.
- the temperature at the tip of the outflow pipe must be raised at regular intervals (approximately 1 to 3 hours) to a temperature at which devitrification disappears. It is extremely difficult to manufacture continuously.
- Japanese Patent Application Laid-Open No. Sho 60-222 1338 discloses a lanthanum borate-based optical glass having a low glass transition point
- Japanese Patent Application Laid-Open No. 5-58669 discloses A lanthanum borate-based optical glass suitable for mold press molding has been disclosed.
- these glasses have a devitrification temperature higher than a temperature at which a viscosity suitable for production of a preform material is obtained, so that the above-described problem occurs.
- the optical glass for a mold press has a low glass transition point as described above and a devitrification temperature lower than a melt temperature at which a viscosity suitable for molding a preform material is obtained.
- the melt temperature at which a viscosity suitable for the molding is obtained is as low as possible in consideration of the heat-resistant temperature of the mold used for the preform molding.
- glass containing a PbO component is unsuitable as an optical glass for mold press because it is difficult to use the mold repeatedly because it easily fuses with the mold during mold pressing. .
- glass containing F 2 components when forming the preform, the surface layer of the glass melt, or fogging from occurring at the preform material selectively volatile F 2 components, preform the by F 2 component volatilizes at the time of press molding stick to a mold, by reason of such or fogging from occurring at the mold surface, not suitable as an optical glass for mold pressing.
- the present invention ameliorates the drawbacks of the conventional glass and provides a refractive index (n d) 1.
- An optical glass for mold press having a devitrification temperature lower than the melt temperature at which a suitable viscosity is obtained and having excellent devitrification resistance is provided. not containing F 2 component, and an object thereof is to provide a press molding optical glass Contact and optical elements. Disclosure of the invention
- the present inventors have proposed a lanthanum borosilicate glass melt
- the optical glass for a mold press of the present invention has an optical constant in the range of a refractive index (nd) of 1.65 to 1.73 and an Abbe number (d) of 50 to 60.
- Tg glass transition point
- an optical element of the present invention has an optical constant in the range of a refractive index (nd) of 1.65 to 1.73 and an Abbe number (d) of 50 to 60; It consists of a lanthanum borosilicate glass having a transition point (Tg) in the range of 480 to 58 O.
- FIG. 1 is a diagram showing the relationship between the temperature and the viscosity of a glass melt.
- S i 0 2 component is a glass forming component, to maintain devitrification resistance improved and chemical durability of the glass, it is necessary to contain 10% or more, the low-temperature softening property Exceeding 20% It becomes difficult to maintain.
- B 2 0 3 component is an effective glass forming Ingredient to provide a low-temperature softening property to the glass, the amount is to keep the glass devitrification resistance and chemical durability, It should be in the range of 23-35%.
- the total amount of S i 0 2 and B 2 0 3 component, to maintain the optical constants of the devitrification resistance and the target should be in the range of 3 6-5 0%.
- Each component of the L a 2 ⁇ 3, Y 2 ⁇ 3, G d 2 ⁇ 3, increasing the refractive index of the glass is an effective ingredient for lowering dispersion.
- the refractive index of the glass Ru is contained 1 0% or more to a desired value, should be in 2 1% or less for the devitrification resistance maintained, in particular resistance to In order to obtain a glass having excellent devitrification, the amount is preferably 18% or less.
- resistance to devitrification was an essential component since it is Ah Ru component effect of improving the glass in devitrification resistance, the amount of interest is less than 5% If the content exceeds 15%, the glass is rather devitrified.
- the G d 2 ⁇ 3 component can be arbitrarily contained for adjusting the optical constant, but it should be up to 10% in order to maintain the devitrification resistance.
- the total amount of these three components needs to be in the range of 15 to 40%.
- T a 2 0 5 component is an essential component in the glass of the present invention since it significantly improves the devitrification of the glass, remarkable effect is not observed in the amount of less than 1%, and 1 0% If it exceeds, the glass will be devitrified easily.
- Z R_ ⁇ 2 component can be optionally contained for the purpose of improving the chemical durability of the adjustment and the glass of the optical constants, it should be less than or equal to 8% for the devitrification resistance maintained.
- the Z ⁇ ⁇ component is a component having an effect of improving the water resistance among the chemical durability of glass.
- glass having a low content of Li 2 ⁇ has a great effect of lowering the glass transition point without deteriorating the chemical durability. Therefore, it can be optionally introduced into the glass of the present invention in order to obtain these effects. Must be 10% or less to maintain the performance.
- Each component of CaO, Sr0, and Ba0 can be introduced up to 20% for adjusting the optical constants and stabilizing the glass, but if it exceeds 20%, the glass is more likely to devitrify. Not only does it make the glass less chemically durable.
- the CaO component is an essential component because it has a large effect of improving the devitrification of the glass, but the amount must be 5% or more to obtain a glass more stable against devitrification. .
- the total amount of one or more of ZnO, SrO, and Ba0 components and the Ca C component, which is an essential component is in the range of 10 to 35%, glass The devitrification resistance is the best.
- the L i 2 ⁇ component is an important component that improves the melting property and devitrification resistance of the glass and gives the glass a low-temperature softening property.
- the L i 2 ⁇ component should be contained in the glass of the present invention. As a result, it is possible to obtain a glass transition point of 580 ° C or lower, which is a required physical property as an optical glass for a mold press. In order to obtain these effects, it is necessary to contain 2.5 % or more of Li 2 ⁇ component, and if the amount exceeds 8%, both the chemical durability and the devitrification resistance of the glass deteriorate. would.
- S b 2 0 3 component force amounts thereof can be optionally added as a refining agent in the glass melting is sufficient 1% or less.
- the solid line X in FIG. 1 shows an example of the relationship between the melt temperature and the viscosity of the optical glass of the present invention having the above composition.
- the M-N part where the solid line X overlaps E is the melt temperature, which is preferred when producing a preform of this glass, obtained from the viscosity.
- the temperature point D corresponding to N There is no particular limitation on the temperature point D corresponding to N. However, in order to prevent fusion between the glass and the mold used for molding the preform material, the point D must be lower than about 950 ° C. It is even more preferred. In this case, the preform material forming operation may be performed within the M-N temperature range.
- the point D may be higher than about 950 ° C., in which case the preform material may be at a temperature between M and N and lower than about 950 ° C. May be formed.
- the obtained preform material is heated and softened, and the obtained preform material is press-molded with a mold having a high-precision surface, that is, a mold press is performed to obtain an optical element such as a lens.
- Table 1 shows the compositions (No .:! To No. 15) of Examples of the optical glass for a mold press of the present invention.
- Table 3 shows the compositions of the comparative examples (No. 1 to No. 6) of the conventional optical glasses as described above, and the physical properties and test results exactly the same as those shown in Table 2 for those optical glasses. showed that.
- Example Nos . The optical glasses for mold presses of Nos. To No. 15 were prepared by mixing ordinary optical glass raw materials such as oxides, carbonates and nitrates at a predetermined ratio such that the composition ratios shown in Table 1 were obtained. After mixing, put into a platinum crucible etc., melt at a temperature of 1000-1300 ° C for 2-4 hours, stir homogenize, and lower to an appropriate temperature, depending on the degree of meltability due to composition It was easily obtained by immersing it in a mold and cooling slowly.
- the glasses of the examples of the present invention all have a desired optical constant and a low glass transition point (Tg) in the range of 480 to 580 ° C. Suitable for.
- the optical glass of the embodiment according to the present invention does not cause devitrification in the working temperature range during molding of the preform material, has excellent devitrification resistance, and all of the optical glass formed by dropping the glass melt. It is most suitable for molding of reform materials.
- the optical glass for mold press of the present invention has a refractive index (nd) of 1.65 to: L. 73, an Abbe number (V d) of 50 to 60, and an optical constant of 48.
- It is a lanthanum borosilicate glass having a glass transition point (Tg) in the range of 0 to 580 ° C, and the devitrification temperature is determined by the viscosity of the glass melt 7 (p oise) force 1 og 7
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Joining Of Glass To Other Materials (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69937687T DE69937687T2 (de) | 1998-10-12 | 1999-10-08 | Optisches glass für pressformung und optisches element |
EP99970374A EP1125898B1 (en) | 1998-10-12 | 1999-10-08 | Optical glass for mold pressing and optical element |
US09/787,381 US6713419B1 (en) | 1998-10-12 | 1999-10-08 | Optical glass for precision press molding and optical element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/289765 | 1998-10-12 | ||
JP28976598A JP3377454B2 (ja) | 1998-10-12 | 1998-10-12 | モールドプレス用光学ガラス |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000021895A1 true WO2000021895A1 (fr) | 2000-04-20 |
Family
ID=17747477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/005565 WO2000021895A1 (fr) | 1998-10-12 | 1999-10-08 | Verre optique pour moulage sous pression et element optique |
Country Status (8)
Country | Link |
---|---|
US (1) | US6713419B1 (ja) |
EP (1) | EP1125898B1 (ja) |
JP (1) | JP3377454B2 (ja) |
KR (1) | KR100536561B1 (ja) |
CN (1) | CN1165493C (ja) |
AT (1) | ATE380163T1 (ja) |
DE (1) | DE69937687T2 (ja) |
WO (1) | WO2000021895A1 (ja) |
Cited By (4)
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---|---|---|---|---|
WO2002053506A1 (en) * | 2000-12-28 | 2002-07-11 | Matsushita Electric Industrial Co., Ltd. | Glass for molded lens |
WO2002062712A1 (en) * | 2001-02-05 | 2002-08-15 | Koninklijke Philips Electronics N.V. | Multicomponent glass, glass fiber, twister and taper |
US6806217B2 (en) | 2000-12-28 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Glass for molded lens |
US7087543B2 (en) * | 2002-07-03 | 2006-08-08 | Hoya Corporation | Optical glass, press-molding preform and optical element |
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JP4997990B2 (ja) * | 2007-01-24 | 2012-08-15 | コニカミノルタアドバンストレイヤー株式会社 | 光学ガラス及び光学素子 |
US8661853B2 (en) * | 2008-11-10 | 2014-03-04 | Hoya Corporation | Method for producing glass, optical glass, glass material for press molding, optical element and methods for producing same |
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1998
- 1998-10-12 JP JP28976598A patent/JP3377454B2/ja not_active Expired - Lifetime
-
1999
- 1999-10-08 EP EP99970374A patent/EP1125898B1/en not_active Expired - Lifetime
- 1999-10-08 AT AT99970374T patent/ATE380163T1/de not_active IP Right Cessation
- 1999-10-08 KR KR10-2001-7004576A patent/KR100536561B1/ko not_active IP Right Cessation
- 1999-10-08 DE DE69937687T patent/DE69937687T2/de not_active Expired - Lifetime
- 1999-10-08 WO PCT/JP1999/005565 patent/WO2000021895A1/ja active IP Right Grant
- 1999-10-08 US US09/787,381 patent/US6713419B1/en not_active Expired - Fee Related
- 1999-10-08 CN CNB998120677A patent/CN1165493C/zh not_active Expired - Lifetime
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002053506A1 (en) * | 2000-12-28 | 2002-07-11 | Matsushita Electric Industrial Co., Ltd. | Glass for molded lens |
US6806217B2 (en) | 2000-12-28 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Glass for molded lens |
WO2002062712A1 (en) * | 2001-02-05 | 2002-08-15 | Koninklijke Philips Electronics N.V. | Multicomponent glass, glass fiber, twister and taper |
US7087543B2 (en) * | 2002-07-03 | 2006-08-08 | Hoya Corporation | Optical glass, press-molding preform and optical element |
Also Published As
Publication number | Publication date |
---|---|
EP1125898A1 (en) | 2001-08-22 |
KR100536561B1 (ko) | 2005-12-14 |
JP2000119036A (ja) | 2000-04-25 |
DE69937687D1 (de) | 2008-01-17 |
EP1125898A4 (en) | 2005-11-09 |
JP3377454B2 (ja) | 2003-02-17 |
EP1125898B1 (en) | 2007-12-05 |
KR20010080105A (ko) | 2001-08-22 |
DE69937687T2 (de) | 2008-11-20 |
CN1165493C (zh) | 2004-09-08 |
ATE380163T1 (de) | 2007-12-15 |
US6713419B1 (en) | 2004-03-30 |
CN1323281A (zh) | 2001-11-21 |
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