CN102923952A - Optical glass, glass prefabricated part and optical element - Google Patents
Optical glass, glass prefabricated part and optical element Download PDFInfo
- Publication number
- CN102923952A CN102923952A CN201210480414XA CN201210480414A CN102923952A CN 102923952 A CN102923952 A CN 102923952A CN 201210480414X A CN201210480414X A CN 201210480414XA CN 201210480414 A CN201210480414 A CN 201210480414A CN 102923952 A CN102923952 A CN 102923952A
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- glass
- opticglass
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- 230000003287 optical effect Effects 0.000 title claims description 18
- 239000011521 glass Substances 0.000 title abstract description 47
- 239000005304 optical glass Substances 0.000 title abstract description 13
- 230000007704 transition Effects 0.000 claims description 15
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 229910052746 lanthanum Inorganic materials 0.000 claims description 8
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 4
- 238000000748 compression moulding Methods 0.000 abstract description 5
- 230000009466 transformation Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004031 devitrification Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000007723 die pressing method Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005352 clarification Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007527 glass casting Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
-
- 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
- C03C4/00—Compositions for glass with special properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Landscapes
- 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)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
Abstract
The invention provides a piece of optical glass for low-cost precision compression molding. As for the piece of optical glass, a Y2O3 component is not contained, the density is lower than 4.2 g/cm<3>, the refractivity is 1.71-1.78, the Abbe number is 45-55, and the transformation temperature is lower than 560 DEG C. According to the invention, the content of all the components is reasonably arranged and expensive Y2O3 is not added, so that the production cost is reduced, the resource is saved, and the glass specific weight is reduced. Therefore, the piece of optical glass provided by the invention is suitable for precision compression molding.
Description
Technical field
The present invention relates to a kind of specific refractory power and be 1.70～1.80, Abbe number is 45～55 accurate die pressing optical glass, and the optical element of being made by this opticglass.
Background technology
Along with digital camera with the popularizing of the mobile telephone of photographic camera, use highly integrated, the high performance of the equipment of optical system to advance rapidly.Requirement to the high precision int of optical system, lightweight, miniaturization is also more and more stronger, and this just requires optical material to have less proportion.Wish realizes high-performance and miniaturization, then needs miniaturization, high integrated and can be used for high-performance the optical element (such as optical lens) of optical device.In these optical elements, non-spherical lens has vital role in optical design, because using single non-spherical lens can realize eliminating by the aberration that uses a plurality of spherical lenses to realize so far, and can make the optical system integrated level high, for reaching this purpose, increasing to the demand of opticglass with high refraction, low dispersion.
In the optical element forming method, the accurate die pressing method has become main flow, and the accurate die pressing of glass is under pressure, high temperature, with the mould molded glass precast body with predetermined shape, obtains the glass moldings that has the finished product shape or approach very much with its shape.Utilize the accurate die pressing method, can high productivity scale operation have the moulded product of desired shape.Because the pinpoint accuracy of required geometrical shape, this drawing method must use senior precision instrument, and therefore needs expensive moulding stock, and the life-span of this mould greatly affects the income of the product of producing.The high-time important factor of mould is that working temperature is low as much as possible, but it can only be reduced to the degree that the viscosity that is pressed material still is enough to be used in drawing method.This just means, between the rentability of the transition temperature Tg of processed glass and drawing method, have direct cause-effect relationship: the transition temperature of glass is lower, then the life-span of mould just longer, income is just higher.This is just to have the demand of opticglass of low transition temperature increasing.
Japanese patent application 2002-249337 discloses that specific refractory power is 1.72～1.83, Abbe number is 45～55 opticglass, and its transition temperature is higher, and proportion is larger, be difficult to realize economy and lightweight.Chinese patent application 200710006744.4 discloses a kind of opticglass, wherein contains a large amount of expensive Y
2O
3, the glass cost is high, be unsuitable for industrialization production, and its proportion is relatively large, is unsuitable for the use of lightweight optical system.
Summary of the invention
Technical problem to be solved by this invention provides a kind of cheaply optical glass for precision profiling, and the density of this opticglass (ρ) is 4.3g/cm
3Below, specific refractory power (nd) is 1.70～1.80, and Abbe number (vd) is 45～55, and transition temperature (Tg) is below 560 ℃.
The technical scheme that technical solution problem of the present invention adopts is: opticglass, do not contain Y
2O
3Component, density are 4.3g/cm
3Below, specific refractory power is 1.71～1.78, and Abbe number is 45～55, and transition temperature is below 560 ℃.
Further, its weight percent consists of: SiO
2: 1～10%, B
2O
3: 21～34%, La
2O
3: 20～32%, ZrO
2: 1～8%, ZnO:15～28%, Ta
2O
5: 0～8%, Gd
2O
3: 5～17%, CaO:0～5%, SrO:0～3%, Li
2O:0.1～3%, Na
2O:0～1%.
Further, wherein: SiO
2: 2～7%.
Further, wherein: B
2O
3: 25～30%, La
2O
3: 22～30%.
Further, wherein: ZrO
2: 1～5%.
Further, wherein: ZnO:18～26%.
Further, wherein: Ta
2O
5: 1～5%.
Further, wherein: Gd
2O
3: 9～15%.
Opticglass, its weight percent consists of: SiO
2: 1～10%, B
2O
3: 21～34%, La
2O
3: 20～32%, ZrO
2: 1～8%, ZnO:15～28%, Ta
2O
5: 0～8%, Gd
2O
3: 5～17%, CaO:0～5%, SrO:0～3%, Li
2O:0.1～3%, Na
2O:0～1%.
Further, wherein: SiO
2: 2～7%.
Further, wherein: B
2O
3: 25～30%, La
2O
3: 22～30%.
Further, wherein: ZrO
2: 1～5%.
Further, wherein: ZnO:18～26%.
Further, wherein: Ta
2O
5: 1～5%.
Further, wherein: Gd
2O
3: 9～15%.
The gas preform that adopts above-mentioned opticglass to make.
The optical element that adopts above-mentioned opticglass to make.
The opticinstrument that adopts above-mentioned opticglass to make.
The invention has the beneficial effects as follows: the present invention does not add expensive Y by the content of each component of reasonable arrangement
2O
3, reduced production cost, saved resource, reduced simultaneously the proportion of glass.Opticglass density of the present invention (ρ) is 4.3g/cm
3Below, specific refractory power (nd) is 1.70～1.80, and Abbe number is 45～55, and transition temperature is below 560 ℃, is applicable to precise compression molding and uses.
Embodiment
The below will describe each component of opticglass of the present invention, and except as otherwise noted, the ratio of each component content is to represent with % by weight.
SiO
2Be that the network that forms glass generates oxide body, add a certain amount of SiO
2Can increase the high temperature viscosity of glass, improve the devitrification resistance property of glass.SiO
2Content when surpassing 10%, the meltability of opticglass reduces, softening temperature raises.So SiO
2Content be defined as 1～10%, be preferably 2～7%.
As a kind of effective oxide that forms the glass network structure, B
2O
3It is the necessary component that obtains the lanthanide optical glass of high refraction, low dispersion.B among the present invention
2O
3The meltbility of glass be can effectively improve, smelting temperature and viscous flow temperature reduced.Work as B
2O
3When content is lower than 21%, be difficult to obtain the glass of stable in properties, devitrification resistance property is undesirable; But work as B
2O
3When content was higher than 34%, the specific refractory power of glass did not reach design objective, and the chemical stability of glass can reduce simultaneously.Therefore, B
2O
3Content be defined as 21～34%, more preferably content is 25～30%.
La
2O
3Be the main component of high refraction, low-dispersion optical glass for mold, can increase the specific refractory power of glass and the dispersion of not obvious raising glass, in formula system of the present invention, B
2O
3With La
2O
3Combination exist, can effectively improve the devitrification resistance property of glass, improve the chemical stability of glass.Work as La
2O
3Content when being lower than 20%, can not obtain above effect; When its content surpassed 32%, the crystallization property of glass worsened, so its content is defined as 20～32%, preferred content is 22～30%.
Gd
2O
3Have the specific refractory power that improves glass and the effect of chemical stability, particularly and La
2O
3When jointly existing, the devitrification resistance performance of raising glass and the effect of chemical stability are more obvious.If but its content is too much, can improve the transition temperature of glass, increase the difficulty of moulding prefabricated and precise compression molding, so Gd
2O
3Content be defined as 5～17%, be preferably 9～15%.
ZrO
2Viscosity, hardness, elasticity, specific refractory power and the chemical stability of opticglass can be improved, and the thermal expansivity of glass can be reduced.Work as ZrO
2Content when surpassing 8%, crystallization will occur, and reduce the devitrification resistance of glass.ZrO
2Content be 1～8%, preferred content is 1～5%.
ZnO is the important component that forms low-melting point optical glass, can reduce thermal expansivity and the transition temperature of glass, improves chemical stability, thermostability and the specific refractory power of glass.When the content of ZnO greater than 28% the time, the increased devitrification resistance of opticglass increases, dispersion obviously increases; When the content of ZnO less than 15% the time, the transition temperature of opticglass raises.Therefore, the content of ZnO is preferably 15～28%, and more preferably 18～26%.
Ta
2O
5The component of giving the high refraction of opticglass and low dispersion property, the effective high-temperature stability of reinforcing glass, but Ta
2O
5Content is high, and glass cost and density increase.So Ta
2O
5Content be preferably 0～8%, more preferably 1～5%.
CaO has the stability, glass of improvement, and melting helps the effect of raw material fusing when producing, but its content when being higher than 5% the tendency towards devitrification of glass increase, so the content of CaO is defined as 0～5%.
The effect of SrO in glass is similar to BaO, replaces part BaO can accelerate fusing and the clarification of glass with SrO, reduces the tendency towards devitrification of glass, when its content is higher than 3%, found difficulty, so SrO content is defined as 0～3%, be preferably 0～1%, more preferably do not add.
Na
2O can improve the melting behaviour of glass, but introduces the phase-splitting trend that can aggravate too much glass, so its preferred content is 0～1%.
Li
2O can effectively reduce glass transformation temperature, effectively improves the thawing ability of glass, reduces temperature of fusion, also can effectively reduce glass density simultaneously; But worsen when its content Gao Shihui makes the processing performance of glass, the devitrification resistance of glass and chemical stability descend, so Li
2The preferred content of O is 0.1～3%.
The performance of opticglass of the present invention is described below.
Density is according to testing by " GB/T 7962.20-1987 colouless optical glass testing method density measurement method ".
Specific refractory power and Abbe number are tested according to " GB/T 7962.1-1987 colouless optical glass testing method specific refractory power and abbe numbers ".
Transition temperature (Tg) is tested according to " GB/T7962.16-1987 colouless optical glass testing method linear expansivity, transition temperature and sag temperature ", that is: sample is in certain temperature range, 1 ℃ of the every rising of temperature, on the expansion curve of sample, low-temperature region and the extension of high-temperature area straight line portion are intersected the corresponding temperature of its intersection point.
Through test, opticglass provided by the invention has following performance: density (ρ) is 4.3g/cm
3Below; Specific refractory power (nd) is 1.70～1.80, and Abbe number is 45～55, and transition temperature is below 560 ℃.
The present invention also provides a kind of optical element, is formed according to method well known to those skilled in the art by above-mentioned opticglass.Because described opticglass has high refractive index and lower glass transformation temperature, therefore described optical element also has high refractive index and lower glass transformation temperature, can be applied to the equipment such as digital camera, digital camera, camera cell phone.
Embodiment
In order further to understand technical scheme of the present invention, the below will describe the embodiment of opticglass of the present invention.Should be noted that these embodiment are scope of the present invention without limits.
The opticglass (embodiment 1～30) that shows in table 1～table 3 is by weighing according to the ratio of each embodiment shown in table 1～3 and hybrid optical glass common raw material (such as oxide compound, oxyhydroxide, carbonate, nitrate and fluorochemical), mixing raw material is placed in the platinum crucible, melting in 1100～1300 ℃ temperature, and after fusing, clarification, stirring and homogenizing, obtain not having bubble and do not contain the not homogeneous melten glass of dissolved substance, this melten glass casting mold in mould is also annealed to be formed.
The composition of the embodiment of the invention 1～30 represents in table 1～3 with the result of specific refractory power (nd), Abbe number (vd), density (ρ), glass transformation temperature (Tg).In these tables, the composition of each component represents with % by weight.
Table 1
Table 2
Table 3
Can find out that from above-described embodiment opticglass density of the present invention (ρ) is 4.3g/cm
3Below, specific refractory power (nd) is 1.70～1.80, and Abbe number is 45～55, and transition temperature is below 560 ℃, is applicable to precise compression molding and uses.
Claims (18)
1. opticglass is characterized in that, does not contain Y
2O
3Component, density are 4.3g/cm
3Below, specific refractory power is 1.70～1.80, and Abbe number is 45～55, and transition temperature is below 560 ℃.
2. opticglass as claimed in claim 1 is characterized in that, its weight percent consists of: SiO
2: 1～10%, B
2O
3: 21～34%, La
2O
3: 20～32%, ZrO
2: 1～8%, ZnO:15～28%, Ta
2O
5: 0～8%, Gd
2O
3: 5～17%, CaO:0～5%, SrO:0～3%, Li
2O:0.1～3%, Na
2O:0～1%.
3. opticglass as claimed in claim 2 is characterized in that, wherein: SiO
2: 2～7%.
4. opticglass as claimed in claim 2 is characterized in that, wherein: B
2O
3: 25～30%, La
2O
3: 22～30%.
5. opticglass as claimed in claim 2 is characterized in that, wherein: ZrO
2: 1～5%.
6. opticglass as claimed in claim 2 is characterized in that, wherein: ZnO:18～26%.
7. opticglass as claimed in claim 2 is characterized in that, wherein: Ta
2O
5: 1～5%.
8. opticglass as claimed in claim 2 is characterized in that, wherein: Gd
2O
3: 9～15%.
9. opticglass is characterized in that, its weight percent consists of: SiO
2: 1～10%, B
2O
3: 21～34%, La
2O
3: 20～32%, ZrO
2: 1～8%, ZnO:15～28%, Ta
2O
5: 0～8%, Gd
2O
3: 5～17%, CaO:0～5%, SrO:0～3%, Li
2O:0.1～3%, Na
2O:0～1%.
10. opticglass as claimed in claim 9 is characterized in that, wherein: SiO
2: 2～7%.
11. opticglass as claimed in claim 9 is characterized in that, wherein: B
2O
3: 25～30%, La
2O
3: 22～30%.
12. opticglass as claimed in claim 9 is characterized in that, wherein: ZrO
2: 1～5%.
13. opticglass as claimed in claim 9 is characterized in that, wherein: ZnO:18～26%.
14. opticglass as claimed in claim 9 is characterized in that, wherein: Ta
2O
5: 1～5%.
15. opticglass as claimed in claim 9 is characterized in that, wherein: Gd
2O
3: 9～15%.
16. adopt the gas preform that the described opticglass of arbitrary claim is made among the claim 1-15.
17. the optical element of making such as the described opticglass of the arbitrary claim of claim 1-15.
18. the opticinstrument of making such as the described opticglass of the arbitrary claim of claim 1-15.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210480414XA CN102923952A (en) | 2012-11-23 | 2012-11-23 | Optical glass, glass prefabricated part and optical element |
| CN201710873705.8A CN107473582A (en) | 2012-11-23 | 2012-11-23 | Optical glass, gas preform and optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210480414XA CN102923952A (en) | 2012-11-23 | 2012-11-23 | Optical glass, glass prefabricated part and optical element |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710873705.8A Division CN107473582A (en) | 2012-11-23 | 2012-11-23 | Optical glass, gas preform and optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102923952A true CN102923952A (en) | 2013-02-13 |
Family
ID=47638916
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710873705.8A Pending CN107473582A (en) | 2012-11-23 | 2012-11-23 | Optical glass, gas preform and optical element |
| CN201210480414XA Pending CN102923952A (en) | 2012-11-23 | 2012-11-23 | Optical glass, glass prefabricated part and optical element |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710873705.8A Pending CN107473582A (en) | 2012-11-23 | 2012-11-23 | Optical glass, gas preform and optical element |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107473582A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152656A1 (en) * | 2016-03-07 | 2017-09-14 | 成都光明光电股份有限公司 | Optical glass and optical element |
| CN109650716A (en) * | 2019-01-22 | 2019-04-19 | 成都光明光电股份有限公司 | A kind of colouless optical glass and its gas preform, element and instrument |
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| JPH0826766A (en) * | 1994-07-07 | 1996-01-30 | Nikon Corp | Optical glass |
| CN1418836A (en) * | 2001-10-24 | 2003-05-21 | 保谷株式会社 | Optics glass, press-die fabricated body and optics assembly |
| CN1967287A (en) * | 2005-11-16 | 2007-05-23 | 日本电气硝子株式会社 | Optical glass for pressure forming |
| WO2009072586A1 (en) * | 2007-12-06 | 2009-06-11 | Asahi Glass Co., Ltd. | Optical glass, and preform for fine press molding and optical element each comprising the same |
| CN101935164A (en) * | 2009-06-30 | 2011-01-05 | 株式会社小原 | Optical glass, preforming material and optical element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001072432A (en) * | 1999-07-06 | 2001-03-21 | Minolta Co Ltd | Optical glass |
| JP2002128539A (en) * | 2000-10-13 | 2002-05-09 | Ohara Inc | Low fluorescent optical glass |
| JP4789358B2 (en) * | 2001-07-03 | 2011-10-12 | 株式会社オハラ | Optical glass |
| JP4141739B2 (en) * | 2001-10-22 | 2008-08-27 | 株式会社住田光学ガラス | Optical glass for precision press molding |
| CN101386469B (en) * | 2008-10-16 | 2011-05-11 | 成都光明光电股份有限公司 | High refraction and low dispersion optical glass |
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2012
- 2012-11-23 CN CN201710873705.8A patent/CN107473582A/en active Pending
- 2012-11-23 CN CN201210480414XA patent/CN102923952A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0826766A (en) * | 1994-07-07 | 1996-01-30 | Nikon Corp | Optical glass |
| CN1418836A (en) * | 2001-10-24 | 2003-05-21 | 保谷株式会社 | Optics glass, press-die fabricated body and optics assembly |
| CN1967287A (en) * | 2005-11-16 | 2007-05-23 | 日本电气硝子株式会社 | Optical glass for pressure forming |
| WO2009072586A1 (en) * | 2007-12-06 | 2009-06-11 | Asahi Glass Co., Ltd. | Optical glass, and preform for fine press molding and optical element each comprising the same |
| CN101935164A (en) * | 2009-06-30 | 2011-01-05 | 株式会社小原 | Optical glass, preforming material and optical element |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152656A1 (en) * | 2016-03-07 | 2017-09-14 | 成都光明光电股份有限公司 | Optical glass and optical element |
| JP2019511445A (en) * | 2016-03-07 | 2019-04-25 | 成都光明光▲電▼股▲分▼有限公司 | Optical glass and optical element |
| US10494294B2 (en) | 2016-03-07 | 2019-12-03 | Cdgm Glass Co., Ltd. | Optical glass and optical element |
| CN109650716A (en) * | 2019-01-22 | 2019-04-19 | 成都光明光电股份有限公司 | A kind of colouless optical glass and its gas preform, element and instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107473582A (en) | 2017-12-15 |
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