WO2007136071A1 - 光学ガラス - Google Patents
光学ガラス Download PDFInfo
- Publication number
- WO2007136071A1 WO2007136071A1 PCT/JP2007/060460 JP2007060460W WO2007136071A1 WO 2007136071 A1 WO2007136071 A1 WO 2007136071A1 JP 2007060460 W JP2007060460 W JP 2007060460W WO 2007136071 A1 WO2007136071 A1 WO 2007136071A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- content
- glass
- less
- optical
- temperature
- 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
-
- 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
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
-
- 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
-
- 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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
-
- 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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
- C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
-
- 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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
Definitions
- the present invention relates to an optical glass suitable for precision press molding.
- Optical lenses are widely used in optical pickups for various optical disk systems such as CD and DVD, video cameras, and digital cameras.
- the demand for these products has increased remarkably, and accordingly, there has been a demand for a medium refractive index low dispersion optical lens that is cheaper and more productive.
- a mold press molding method has been widely used as a manufacturing method of these optical lenses as a product having high productivity and low manufacturing cost.
- this manufacturing method an optical lens having a desired shape is realized by pressing preform glass heated to a temperature equal to or higher than the glass transition temperature using two pairs of upper and lower molding dies having high-precision surfaces. .
- the yield point Ts is low.
- a release film or the like is used on the surface of the mold in order to prevent the mold and the heated glass from fusing, but this release film is exposed to a high temperature. This is because of deterioration. That is, in order to manufacture an optical lens at a lower cost by this mold press manufacturing method, an optical glass having a low yield point and low temperature softness is required.
- SiO 2 —PbO—R 2 O-based glass has been used as an optical glass having low dispersion at medium refractive index and suitable for mold press molding and having low-temperature softening properties.
- SiO 2 —PbO—R 2 O-based glass has been used as an optical glass having low dispersion at medium refractive index and suitable for mold press molding and having low-temperature softening properties.
- SiO 2 -B 2 O—RO-based glass can be used with alkaline oxides such as Li 2 O, Na 0, and K 2.
- the weather resistance is bad.
- the optical glass described in Patent Document 1 has a sufficiently low yield point and is suitable for a mold press. Further improvement in strength and weather resistance is not desired.
- the optical glasses described in Patent Documents 2 and 3 have sufficient weather resistance, but a lower yield point is desired in order to produce an optical lens at a lower cost because the yield point is relatively high.
- Patent Document 1 Japanese Patent Laid-Open No. 7-149536
- Patent Document 2 JP-A-60-122747
- Patent Document 3 Japanese Patent Laid-Open No. 4 37628
- An object of the present invention is to provide an optical glass suitable for mold press molding, having a low yield point, excellent weather resistance, and having a medium refractive index and low dispersibility.
- the concentration of SiO and B 2 O forming the glass skeleton should be optimized.
- the present invention provides the following optical glass.
- ⁇ 0.1 to 10%, ⁇ 1 ⁇ : 2 to 15%, BaO: 10 to 40%, K O: 0 to 5%, Na O: 0
- Refractive index n is 1.55 or more: L 65, Abbe number v Force 5 to 65
- each component of SiO, B 2 O, Li 0, ZnO, Al 2 O, and BaO is an essential component.
- An optical glass is obtained. Further, according to the present invention, an optical glass having practically sufficient weather resistance in addition to the optical characteristics and having low-temperature softening properties suitable for mold press molding can be obtained. As a result, the degree of deterioration of the film on the mold surface is reduced, and the durability of the mold is improved and the productivity is greatly improved.
- SiO is a main component constituting the network of the glass, and is an essential component in the present glass.
- the SiO content is 35% in order to stabilize the glass and improve devitrification resistance and weather resistance.
- mass% More than mass% (hereinafter, mass% is abbreviated as%).
- SiO content should be 36% or more
- the refractive index is
- the SiO content is 4 because it is difficult to obtain the desired refractive index.
- the SiO content of this glass is preferably 44% or less.
- B O is a component that constitutes the network of the glass, and is an essential component in the present glass.
- the B 2 O is an important component that affects weather resistance. Optically, the Abbe number
- the B 2 O content is 16% or less. 14.5% or less
- the B 2 O content is 12% or more. More preferably, the B 2 O content is 12.5.
- SiO and B 2 O which are components constituting the glass network, lower the refractive index.
- SiO content and BO content are included.
- the total amount is not more than 58%. More preferably, the total amount of SiO content and BO content is 5
- the total strength of the 2 2 3 content will deteriorate the devitrification characteristics of the glass, and in this glass, the total content is 47% or more. More preferably, the total amount of SiO content and B 2 O content is 48% or less.
- Li 2 O is a component for lowering the yield point Ts and is an essential component in the present glass. The effect
- the Li 2 O content is 2% or more. More preferably the Li O content is
- the Li O content should be 7% or less.
- the Li 2 O content is there. It is more preferable that the Li 2 O content is 6.5% or less. The Li 2 O content is 6.2% or less.
- Na O is a component for lowering the yield point Ts, and is not an essential component in the present glass! /.
- the present glass preferably has a Na 2 O content of 0.1% or more.
- Na O is a component that deteriorates the weather resistance, so that it has sufficient weather resistance for practical use.
- the Na 2 O content is preferably 10% or less. If the Na O content is 8% or less
- the preferable Na 2 O content is more preferably 7% or less.
- K O is a component for lowering the yield point Ts, and is not an essential component in the present glass! /.
- K o is also a component that significantly deteriorates the weather resistance. Glass while maintaining weather resistance
- the present glass preferably has a K 2 O content of 5% or less.
- the O content is 3% or less K 2 O is more preferable if the O content is 1% or less
- the present glass has a Li 2 O content, Na 2 O content and
- the total K 2 O content is 14% or less. More preferably, the total amount is 13% or less
- the total amount is 12% or less.
- the total amount of Li O content, Na O content and K 2 O content is 5%
- the total content is 6% or more, and the total content is more preferably 7% or more.
- ZnO is a component for stabilizing the glass while maintaining the weather resistance. Is an essential component.
- the ZnO content is 0.1% or more. More preferably, the ZnO content is 1% or more. The ZnO content is more preferably 2% or more.
- the ZnO content is 10% or less. More preferably, the ZnO content is 6% or less. The ZnO content is further preferably 5% or less.
- Al 2 O is a component that contributes to improving the weather resistance, and is an essential component in the present glass. This
- the Al 2 O content is 2% or more.
- Al O content is 3% or more
- the Al 2 O content is 3.5% or more.
- Al 2 O is also a component that deteriorates devitrification properties. Devitrification characteristics sufficient for practical use
- the Al 2 O content is less than 15%. It is preferable that the Al 2 O content is 10% or less.
- the content of Shigu Al O is 9% or less.
- BaO is a component for stabilizing the glass while lowering the yield point Ts, and is an essential component in the present glass. However, BaO is also a component that deteriorates the weather resistance. In order to obtain a sufficiently low yield point Ts, the BaO content is 10% or more. The BaO content is preferably 20% or more. The BaO content is more preferably 25% or more. On the other hand, in order to obtain practically sufficient weather resistance, the BaO content is 40% or less. The BaO content is preferably 30% or less, and the BaO content is more preferably 29% or less.
- Gd O is a component for adjusting optical properties, and is not an essential component in the present glass.
- Gd 2 O As the Gd 2 O content increases, devitrification resistance deteriorates. Gd O is a relatively expensive source.
- the GdO content should be 20% or less.
- Gd O content of 10% or less is more preferable Gd O content is 5% or less
- the MgO content is preferably 10% or less.
- the MgO content is more preferably 5% or less, and the MgO content is more preferably 1% or less.
- the CaO content is preferably 10% or less.
- the O content is more preferably 5% or less.
- the CaO content is more preferably 1% or less.
- the SrO content is preferably 5% or less.
- the SrO content is preferably 3% or less.
- the SrO content is more preferably 3% or less, and the SrO content is more preferably 1% or less.
- Sb 2 O, SnO, As 2 O may be mentioned as optional components for fining and the like.
- these components each be 0.01% or more.
- these components are preferably 1% or less in order to deteriorate the devitrification resistance.
- the refractive index n is 1.55 or more.
- the refractive index n is 1.57 or more, it is more preferable if the refractive index n is 1.58 or more. D d
- the refractive index n of the present glass is 1.65 or less.
- the refractive index nd of this glass is 1.63 or less, the more preferable refractive index n is 1.
- Particularly preferred is 61 or less.
- the Abbe number V of the present glass is preferably 55 to 65.
- d the Abbe number of the present glass
- the tube number V is more preferably 63 or less, more preferably 62 or less. And refraction d
- n force is 58-1.
- the total number v is preferably 9 to 62.
- the sag temperature Ts of the present glass is 590 ° C or lower, the durability of the mold is improved and it is preferable to perform press molding.
- the yield point Ts of the present glass is more preferably 580 ° C or less, particularly preferably 570 ° C or less.
- the liquidus temperature is related to press formability. Molding is easier as the liquidus temperature is lower.
- the preferable liquidus temperature is 800 ° C or lower, and the more preferable liquidus temperature is 750 ° C or lower.
- the degree of surface alteration in a high-temperature and high-humidity environment is evaluated by the change in transmittance. Percentage decrease in transmittance after holding for 100 hours in an environment of temperature 60 ° C and relative humidity 90%, that is, transmittance before holding (transmittance after holding one) Z transmittance before holding From the viewpoint of weather resistance, it is desirable that it is less than 20%. U, more preferably less than 10%, and even more preferably less than 5%.
- the corresponding carbonates and nitrates were used.
- the corresponding oxides are used as raw materials for other components such as SiO and GdO.
- Refractive index n Abbe number V, mirror polished on both sides, size 20mm X 20mm, thickness 1 d d
- An Omm glass block was measured with a refractive index measuring apparatus (trade name: KPR-2, manufactured by Carnille Optical Co., Ltd.). The measured value is calculated to the 5th decimal place, and for refractive index n, d is rounded to the 3rd decimal place, and Abbe number V is 2 decimal places.
- KPR-2 refractive index measuring apparatus
- the yield point T (° C) is a temperature rise rate of a sample processed into a cylindrical shape with a diameter of 5 mm and a length of 20 mm.
- thermomechanical analyzer (trade name: DIALTOMETER 5000, manufactured by Mac Science) at a temperature of 10 ° CZ.
- the weather resistance was evaluated by measuring the transmittance of a glass block having a size of 20 mm x 20 mm and a thickness of 10 mm with both surfaces mirror-polished to a wavelength of 800 nm, and then adjusting the temperature to 60 ° C and humidity to 90%. After holding for 100 hours in the set high-temperature and high-humidity tank, measure the transmittance again, before holding Later, the degree of decrease in transmittance was evaluated.
- the liquidus temperature (° C) was set to a temperature of 700 ° C or higher and 1000 ° C or lower by placing a 10mm x 10mm x 10mm glass block on a Pt95% —Au5% platinum alloy pan. After holding in the furnace for 1 hour, the lowest temperature was selected as the liquidus temperature among the intense temperatures at which no crystal components were observed. However, a microscope (with a magnification of 100 times) is used to observe the crystal component in the glass, and the sample that has not been observed in the entire temperature range is expressed as “700u”.
- Example 1 to 12 are examples of the present invention
- examples 13 to 14 are comparative examples of the present invention.
- Example 13 is Example 1 of JP-A-4-37628 cited in the background art of this specification
- Example 14 is Example 2 of JP-A-7-149536.
- Example 13 has a very high yield yield point that is equivalent in weather resistance.
- Example 14 although the yield point is low, the weather resistance is remarkably poor.
- Example 6 Example 7 Example 8 Example 9 Example 10
- refractive index n 1.55 to: 1.65, Abbe number v 55 to 65, yield point 600 ° C or less d d
- Optical glass satisfying all of the above and having excellent weather resistance can be easily obtained.
- it has excellent weather resistance, and Since it has low-temperature softness, an optical glass that can significantly improve productivity can be provided.
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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)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008516707A JP5423000B2 (ja) | 2006-05-22 | 2007-05-22 | 光学ガラス |
CN2007800190540A CN101454251B (zh) | 2006-05-22 | 2007-05-22 | 光学玻璃 |
US12/273,574 US7833920B2 (en) | 2006-05-22 | 2008-11-19 | Optical glass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006141852 | 2006-05-22 | ||
JP2006-141852 | 2006-05-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/273,574 Continuation US7833920B2 (en) | 2006-05-22 | 2008-11-19 | Optical glass |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007136071A1 true WO2007136071A1 (ja) | 2007-11-29 |
Family
ID=38723384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/060460 WO2007136071A1 (ja) | 2006-05-22 | 2007-05-22 | 光学ガラス |
Country Status (5)
Country | Link |
---|---|
US (1) | US7833920B2 (ja) |
JP (1) | JP5423000B2 (ja) |
KR (1) | KR20090010994A (ja) |
CN (1) | CN101454251B (ja) |
WO (1) | WO2007136071A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010120837A (ja) * | 2008-10-21 | 2010-06-03 | Nippon Electric Glass Co Ltd | 光学ガラス |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101516793A (zh) * | 2006-09-13 | 2009-08-26 | 旭硝子株式会社 | 光学玻璃 |
KR101290125B1 (ko) * | 2011-03-18 | 2013-07-26 | 한국세라믹기술원 | 비구면 렌즈용 유리조성물 |
CN111116039B (zh) * | 2016-11-07 | 2022-02-11 | 成都光明光电股份有限公司 | 重冕光学玻璃 |
CN111320381B (zh) * | 2020-03-06 | 2022-04-15 | 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 |
CN115028354B (zh) * | 2022-06-22 | 2023-09-05 | 成都光明光电股份有限公司 | 光学玻璃及光学元件 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0337130A (ja) * | 1989-07-04 | 1991-02-18 | Sumita Kogaku Glass:Kk | 精密プレス成形用光学ガラス |
JPH0492834A (ja) * | 1990-08-02 | 1992-03-25 | Sumita Kogaku Glass:Kk | 精密プレス用光学ガラス |
JPH05246735A (ja) * | 1992-03-04 | 1993-09-24 | Canon Inc | 光学ガラス |
JPH08119666A (ja) * | 1994-10-14 | 1996-05-14 | Ohara Inc | 光学ガラス |
JP2003089543A (ja) * | 2001-09-13 | 2003-03-28 | Nippon Electric Glass Co Ltd | モールドプレス成形用光学ガラス |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60122747A (ja) | 1983-12-01 | 1985-07-01 | Ohara Inc | 光学ガラス |
JP3195789B2 (ja) * | 1990-05-29 | 2001-08-06 | ホーヤ株式会社 | 光学ガラス、及びモールド成形品 |
JP2565813B2 (ja) * | 1991-07-05 | 1996-12-18 | 株式会社オハラ | 光学ガラス |
JP2872899B2 (ja) | 1993-11-26 | 1999-03-24 | 株式会社オハラ | 光学ガラス |
US6346493B1 (en) * | 1999-10-27 | 2002-02-12 | Ferro Corporation | Decorative glass enamels |
JP4034589B2 (ja) * | 2001-06-06 | 2008-01-16 | 株式会社オハラ | 光学ガラス |
US7033966B2 (en) * | 2003-05-21 | 2006-04-25 | Asahi Glass Company, Limited | Optical glass and lens |
JP4140775B2 (ja) * | 2004-01-23 | 2008-08-27 | 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 |
WO2006001346A1 (ja) * | 2004-06-24 | 2006-01-05 | Asahi Glass Company, Limited | 光学ガラスおよびレンズ |
DE102005005994B4 (de) * | 2005-02-09 | 2009-05-07 | Schott Ag | Blei- und arsenfreie optische Schwerkrongläser |
JPWO2007049622A1 (ja) * | 2005-10-26 | 2009-04-30 | 旭硝子株式会社 | リン酸塩光学ガラス |
-
2007
- 2007-05-22 CN CN2007800190540A patent/CN101454251B/zh active Active
- 2007-05-22 JP JP2008516707A patent/JP5423000B2/ja active Active
- 2007-05-22 WO PCT/JP2007/060460 patent/WO2007136071A1/ja active Application Filing
- 2007-05-22 KR KR1020087028529A patent/KR20090010994A/ko not_active Application Discontinuation
-
2008
- 2008-11-19 US US12/273,574 patent/US7833920B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0337130A (ja) * | 1989-07-04 | 1991-02-18 | Sumita Kogaku Glass:Kk | 精密プレス成形用光学ガラス |
JPH0492834A (ja) * | 1990-08-02 | 1992-03-25 | Sumita Kogaku Glass:Kk | 精密プレス用光学ガラス |
JPH05246735A (ja) * | 1992-03-04 | 1993-09-24 | Canon Inc | 光学ガラス |
JPH08119666A (ja) * | 1994-10-14 | 1996-05-14 | Ohara Inc | 光学ガラス |
JP2003089543A (ja) * | 2001-09-13 | 2003-03-28 | Nippon Electric Glass Co Ltd | モールドプレス成形用光学ガラス |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010120837A (ja) * | 2008-10-21 | 2010-06-03 | Nippon Electric Glass Co Ltd | 光学ガラス |
Also Published As
Publication number | Publication date |
---|---|
KR20090010994A (ko) | 2009-01-30 |
CN101454251B (zh) | 2012-04-04 |
JPWO2007136071A1 (ja) | 2009-10-01 |
CN101454251A (zh) | 2009-06-10 |
JP5423000B2 (ja) | 2014-02-19 |
US20090075806A1 (en) | 2009-03-19 |
US7833920B2 (en) | 2010-11-16 |
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