CN101508522A - Accurate die pressing optical glass - Google Patents

Accurate die pressing optical glass Download PDF

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Publication number
CN101508522A
CN101508522A CNA200910301183XA CN200910301183A CN101508522A CN 101508522 A CN101508522 A CN 101508522A CN A200910301183X A CNA200910301183X A CN A200910301183XA CN 200910301183 A CN200910301183 A CN 200910301183A CN 101508522 A CN101508522 A CN 101508522A
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glass
percent
optical glass
die pressing
accurate die
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匡波
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CDGM Glass Co Ltd
Chengdu Guangming Optoelectronics Co Ltd
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Chengdu Guangming Optoelectronics Co Ltd
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Abstract

The invention provides easily founded optical glass for precision molding. The glass has a refractive index of 1.65 to 1.70, a dispersion index of 50 to 60, a glass transition temperature less than 540 DEG C, a recrystallization ceiling temperature less than 1,050 DEG C and a density less than 3.4g/cm<3>. The optical glass comprises the following components in percentage by weight: 10 to 25 percent of SiO2, 25 to 35 percent of B2O3, 12 to 22 percent of La2O3, 5 to 18 percent of CaO, 1 to 8 percent of Li2O, 0 to 8 percent of Gd2O3 plus Yb2O3 plus Y2O3, 0 to 8 percent of ZnO, 0 to 5 percent of ZrO2, 0 to 1 percent of Al2O3, 0 to 0.5 percent of SnO, 0 to 0.1 percent of Sb2O3, and less than 2 percent of Ta2O5 plus WO3 plus Nb2O5 plus TiO2. Through the reasonable arrangement of the components of the glass, a volatilization and phase splitting tendency is inhibited in the glass founding process; and the manufacturing difficulty of the optical glass is reduced. The optical glass has a refractive index of 1.65 to 1.70, a dispersion index of 50 to 60, a glass transition temperature less than 540 DEG C, a recrystallization ceiling temperature less than 1,050 DEG C and a density less than 3.4g/cm<3>. The optical glass is suitable for precision molding forming. The optical elements made of the optical glass are suitable for the technical fields of imaging systems, digital projection, medical treatment technology, photolithography, wafers/chips, and the like.

Description

Accurate die pressing optical glass
Technical field
The present invention relates to a kind of accurate die pressing optical glass, particularly relate to a kind of specific refractory power (n d) be 1.65-1.70, abbe number (v d) be 50-60, transition temperature (Tg) is at the opticglass below 540 ℃.
Background technology
The precise compression molding technology is the optical element manufacturing technology that developed recently gets up, this technology is directly carried out die mould to glass and is formed the optical function face, be different from the method for grinding, polishing, can make and have complex-curved optical element, can reduce the lens piece number that constitutes optical system, satisfy the light-weighted demand of optical system.Therefore, the method for making non-spherical lens by precise compression molding becomes main flow, and the demand that is used for the low softening point glass of accurate die pressing continues to increase.
Glass that uses in the precision pressure moulding and preshaping body should have alap transition temperature, the transition temperature of opticglass is low more, the Heating temperature of glass is just low more during extrusion forming, will shorten the time that glass heats up and lowers the temperature, enhance productivity, reduce the working temperature of mould simultaneously, prolong its life-span.Second-order transition temperature is in case above 630 ℃, just be difficult to realize the precision pressure moulding.The precision pressure moulding also requires the crystallization ceiling temperature of glass low in addition, makes glass crystallization not when mold pressing, and for satisfying optical system lightweight demand, the density of glass is also as far as possible little simultaneously.
The opticglass that is used for non-spherical lens requires to have various optical constants, and in recent years, specific refractory power is that 1.65-1.70, abbe number are that the opticglass demand of 50-60 is bigger.CN1903762A discloses this type of opticglass, contains too much B in its glass ingredient 2O 3, Li 2O has aggravated volatilization and the phase-splitting trend in the glass manufacturing process, causes the optical constant fluctuation of glass easily, produces striped, causes the complicated of manufacturing process, brings the rising of manufacturing cost.CN1666967A also discloses this type of opticglass, but glass transformation temperature is higher, reaches 550-630 ℃, and the economy of precise compression molding is relatively poor.
Summary of the invention
Technical problem to be solved by this invention provides a kind of accurate die pressing optical glass of easily founding, and specific refractory power is that 1.65-1.70, abbe number are that 50-60, glass transformation temperature are below 540 ℃.
The technical scheme that technical solution problem of the present invention is adopted is: accurate die pressing optical glass, described glass refraction are 1.65-1.70, and abbe number is 50-60, and glass transformation temperature is less than 540 ℃, and the crystallization ceiling temperature is less than 1050 ℃, and density is less than 3.4g/cm 3
Further, its weight percent consists of: SiO 2: 10-25%, B 2O 3: 25-35%, La 2O 3: 12-22%, CaO:5-18%, Li 2O:1-8%, Gd 2O 3+ Yb 2O 3+ Y 2O 3: 0-8%, ZnO:0-8%, ZrO 2: 0-5%, Al 2O 3: 0-1%, SnO:0-0.5%, Sb 2O 3: 0-0.1%, Ta 2O 5+ WO 3+ Nb 2O 5+ TiO 2＜2%.
Further, SiO wherein 2: 12-22%, B 2O 3: 27-33%, La 2O 3: 15-22%.
Further, wherein CaO:8-15%, Li 2O:3-7%.
Further, Y wherein 2O 3: 2-8%, ZnO:2-8%.
Further, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%.
Further, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%, ZrO 2: 0.5-3%.
Accurate die pressing optical glass, its weight percent consists of: SiO 2: 10-25%, B 2O 3: 25-35%, La 2O 3: 12-22%, CaO:5-18%, Li 2O:1-8%, Gd 2O 3+ Yb 2O 3+ Y 2O 3: 0-8%, ZnO:0-8%, ZrO 2: 0-5%, Al 2O 3: 0-1%, SnO:0-0.5%, Sb 2O 3: 0-0.1%, Ta 2O 5+ WO 3+ Nb 2O 5+ TiO 2＜2%.
Further, SiO wherein 2: 12-22%, B 2O 3: 27-33%, La 2O 3: 15-22%.
Further, wherein CaO:8-15%, Li 2O:3-7%.
Further, Y wherein 2O 3: 2-8%, ZnO:2-8%.
Further, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%.
Further, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%, ZrO 2: 0.5-3%.
The optical element forming preshaping body that accurate die pressing optical glass is made.
The optical element that the accurate die pressing optical glass moulding is made.
The invention has the beneficial effects as follows: by reasonable setting glass ingredient, suppressed volatilization and phase-splitting trend in the glass smelting process, reduced the opticglass manufacture difficulty; Specific refractory power of the present invention is 1.65-1.70, and abbe number is 50-60, and transition temperature is lower than 540 ℃, and the crystallization ceiling temperature is less than 1050 ℃, and glass density is less than 3.4g/cm 3, be applicable to precise compression molding.The optical element of being made by opticglass provided by the invention is applicable to technical fields such as imaging system, digital projection, medical skill, photolithography, wafer/chip.
Embodiment
Below the composition that can contain in the opticglass of the present invention is described, the content of each composition is represented with weight %.
SiO 2Be the neccessary composition that forms glass network structure of the present invention, can play the effect that improves the anti-increased devitrification resistance of glass, when it contains quantity not sufficient 10%, can not be effective; Content surpasses at 25% o'clock, and the transition temperature of glass rises, and be not suitable for precise compression molding, so its preferred content is 10-25%, more preferably 12-22%.
B 2O 3Be the neccessary composition that forms glass network structure of the present invention, can reduce the dispersion values of glass, when its content very few, glass devitrification resistance deficiency; Content is too much, and the chemical stability of glass reduces, and makes that volatilization increases the weight of in the process of founding, and technology difficulty strengthens, so its preferred content is 25-35%, more preferably 27-33%.
La 2O 3Be the specific refractory power that improves glass, reduce the indispensable component of chromatic dispersion, also can effectively improve chemical stability simultaneously, when its content less than 12%, glass refraction is difficult to remain on above-mentioned specified range; Content surpasses at 22% o'clock, and the anti-increased devitrification resistance of glass descends, and founding difficulty increases, so its preferred content is 12-22%, more preferably 15-22%.
Gd 2O 3, Y 2O 3, Yb 2O 3Also be the specific refractory power that improves glass, the component that reduces chromatic dispersion, effect and La 2O 3Similar, and La 2O 3The common existence, can further improve the anti-devitrification stability of glass, therefore the total content of three kinds of components can not be too high, and the preferred content scope is 0-8%.
Y 2O 3Can also improve the crystallization property of glass, but too high levels will weaken the anti-increased devitrification resistance of glass, so Y 2O 3Content more preferably 28%.
Li 2O is the neccessary composition among the present invention, can effectively reduce softening temperature, improves the glass melting performance, but introduces the phase-splitting trend can aggravate glass too much, reduces the chemical stability of glass, so its preferred content is 1-8%, and more preferably content is 3-7%.
Na 2O, K 2O also can improve the glass melting performance, but introduces the phase-splitting trend that can aggravate glass too much, so its preferred content is 0-5%.
ZnO can make glass form the low dispersion property of high refraction, and also can improve the anti-increased devitrification resistance of glass simultaneously and reduce the viscous yield temperature, if too high levels, the chromatic dispersion superelevation of glass, tendency towards devitrification increases, so its content is preferably 0-8%, more preferably 2-8%.
CaO maintains the low-gravity main component of glass of the present invention, can improve stability, glass, and melting helps the raw material fusing when producing, but its content is lower than 5%, DeGrain; Be higher than at 18% o'clock, the tendency towards devitrification of glass increases, so its content is preferably 5-18%, more preferably 8-15%.
When MgO, SrO, BaO use as raw material with the form of carbonate or nitrate, have the effect that promotes the glass froth breaking, also adjustable lay the grain mathematic(al) constant of while, but excessive meeting reduces the glass moisture resistivity, so it adds up to content to be preferably 0-15%.
ZrO 2Add fashionablely on a small quantity, have the effect of adjusting optical constant, improving glass chemistry stability, anti-increased devitrification resistance, if addition surpasses 5%, softening temperature rises, so its preferred content is 0-5%, more preferably 0.5-3%.
Al 2O 3Be any composition, fashionable when adding on a small quantity, can improve glass chemistry stability and moisture resistivity, introduce that glass transition temperature is sharply risen, so its preferred content is 0-1%.
Ta 2O 5, Nb 2O 5, WO 3, TiO 2Be any composition, add fashionablely on a small quantity, can adjust the optical constant of glass, improve glass chemical resistant properties and anti-increased devitrification resistance, so Ta 2O 5+ WO 3+ Nb 2O 5+ TiO 2Content is＜2%.
Outside said components, can add the SnO that is used as finings usually 2And Sb 2O 3, SnO 2Content is 0 or more, but is no more than 0.5%; Sb 2O 3Content is 0 or more, but is no more than 0.1%.
Opticglass manufacture method of the present invention is:
1) opticglass raw materials commonly used such as the oxide compound of weighing each component, carbonate and nitrate by weight proportion add in the platinum crucible behind the thorough mixing;
2) after 1050-1300 ℃ of following fusings, clarification, homogenizing, lower the temperature;
3) melten glass liquid is poured into metal pattern after the preheating, glass is put into after the annealing furnace annealing cooling promptly together with metal pattern.
The present invention is by setting the composition of glass, and the composition in the particularly above-mentioned preferable range can be achieved as follows the characteristic of hope: specific refractory power (n d) be 1.65-1.70, abbe number is (v d) 50-60, wherein specific refractory power (n d) value for (2 ℃/h)-(6 ℃/h) annealing value, 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 ".
Opticglass of the present invention is mainly used in the glass preshaping body that obtains the glass ware forming product by thermoplastic, precision pressure moulding.Therefore,, can keep the high precision molding surface of mould for a long time, preferably have alap transition temperature for suppressing damage to mould.For this reason, by adopting the composition of above-mentioned specified range, can realize the second-order transition temperature of expection.The second-order transition temperature of opticglass of the present invention is below 540 ℃.
For realizing stably manufactured according to above-mentioned manufacture method, it is very important that the crystallization ceiling temperature of opticglass of the present invention is controlled at below 1050 ℃.
Adopt temperature gradient furnace method to measure the crystallization property of glass, glass is made the sample of 180*10*10mm, the side polishing, putting into the stove insulation that has thermograde took out after 4 hours, examine under a microscope the devitrification of glass situation, the top temperature that the crystal correspondence appears in glass is the crystallization ceiling temperature of glass.
Glass density is by " GB/T 7962.20-1987 colouless optical glass testing method density measurement method " test.The density of opticglass of the present invention is 3.35g/cm 3Below.
Opticglass of the present invention can be used as pressure forming glass preshaping body material, perhaps also can be directly with the melten glass pressure forming.Manufacture method and thermoforming process during as the glass preshaping body do not have special restriction, can use known manufacture method and forming method.
In addition, also can carry out press working to the glass preshaping body that opticglass of the present invention is made, make optical element, perhaps also can adopt without the glass preshaping body and directly fusion, this opticglass of remollescent be carried out the direct compression method of forming that press working is made optical element.
Optical element can be used as for example various lens such as biconvex, concave-concave, plano-convex, plano-concave, meniscus, speculum, prism, diffraction grating etc.
The composition of the embodiment 1-17 of glass of the present invention specific refractory power, Abbe number, crystallization ceiling temperature, transition temperature, the density with these glass is shown among the 1-3.The composition of each component is represented with weight % in the table.
Table 1
Figure A200910301183D00081
Table 2
Figure A200910301183D00091
Table 3
Figure A200910301183D00101
As show shown in the 1-3, the opticglass of embodiment of the invention 1-17 all has the optical constant of above-mentioned specified range: specific refractory power (n d) 1.65-1.70, abbe number be (Vd) 50-60, glass transformation temperature is less than 540 ℃, and the crystallization ceiling temperature is less than 1050 ℃, and density is less than 3.4g/cm 3, be applicable to employed preshaping body of precision pressure moulding and precision pressure moulding.

Claims (15)

  1. [claim 1] accurate die pressing optical glass is characterized in that, described glass refraction is 1.65-1.70, and abbe number is 50-60, and glass transformation temperature is less than 540 ℃, and the crystallization ceiling temperature is less than 1050 ℃, and density is less than 3.4g/cm 3
  2. [claim 2] accurate die pressing optical glass as claimed in claim 1 is characterized in that its weight percent consists of: SiO 2: 10-25%, B 2O 3: 25-35%, La 2O 3: 12-22%, CaO:5-18%, Li 2O:1-8%, Gd 2O 3+ Yb 2O 3+ Y 2O 3: 0-8%, ZnO:0-8%, ZrO 2: 0-5%, Al 2O 3: 0-1%, SnO:0-0.5%, Sb 2O 3: 0-0.1%, Ta2O 5+ WO 3+ Nb 2O 5+ TiO 2＜2%.
  3. [claim 3] accurate die pressing optical glass as claimed in claim 2 is characterized in that, wherein SiO 2: 12-22%, B 2O 3: 27-33%, La 2O 3: 15-22%
  4. [claim 4] is characterized in that, wherein CaO:8-15%, Li as claim 2 or 3 described accurate die pressing optical glass 2O:3-7%.
  5. [claim 5] is characterized in that, wherein Y as claim 2 or 3 described accurate die pressing optical glass 2O 3: 2-8%, ZnO:2-8%
  6. [claim 6] is characterized in that, wherein CaO:8-15%, Li as claim 2 or 3 described accurate die pressing optical glass 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%.
  7. [claim 7] is characterized in that, wherein CaO:8-15%, Li as claim 2 or 3 described accurate die pressing optical glass 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%, ZrO 2: 0.5-3%.
  8. [claim 8] accurate die pressing optical glass is characterized in that, its weight percent consists of: SiO 2: 10-25%, B 2O 3: 25-35%, La 2O 3: 12-22%, CaO:5-18%, Li 2O:1-8%, Gd 2O 3+ Yb 2O 3+ Y 2O 3: 0-8%, ZnO:0-8%, ZrO 2: 0-5%, Al 2O 3: 0-1%, SnO:0-0.5%, Sb 2O 3: 0-0.1%, Ta 2O 5+ WO 3+ Nb 2O 5+ TiO 2＜2%.
  9. [claim 9] accurate die pressing optical glass as claimed in claim 8 is characterized in that, wherein SiO 2: 12-22%, B 2O 3: 27-33%, La 2O 3: 15-22%.
  10. [claim 10] be accurate die pressing optical glass as claimed in claim 8 or 9, it is characterized in that, wherein CaO:8-15%, Li 2O:3-7%.
  11. [claim 11] be accurate die pressing optical glass as claimed in claim 8 or 9, it is characterized in that, wherein Y 2O 3: 2-8%, ZnO:2-8%.
  12. [claim 12] be accurate die pressing optical glass as claimed in claim 8 or 9, it is characterized in that, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%.
  13. [claim 13] be accurate die pressing optical glass as claimed in claim 8 or 9, it is characterized in that, wherein CaO:8-15%, Li 2O:3-7%, Y 2O 3: 2-8%, ZnO:2-8%, ZrO 2: 0.5-3%.
  14. The optical element forming preshaping body that [claim 14] made as claim 1,2,3, the described accurate die pressing optical glass of 8 or 9 arbitrary claims.
  15. The optical element that [claim 15] made as claim 1,2,3, the described accurate die pressing optical glass moulding of 8 or 9 arbitrary claims.
CNA200910301183XA 2009-03-27 2009-03-27 Accurate die pressing optical glass Pending CN101508522A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105271714A (en) * 2014-06-26 2016-01-27 成都光明光电股份有限公司 Optical glass and optical element
JP2018140930A (en) * 2017-02-24 2018-09-13 日本電気硝子株式会社 Optical glass
CN106542731B (en) * 2015-09-23 2021-09-10 肖特股份有限公司 Chemically resistant glass and use thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105271714A (en) * 2014-06-26 2016-01-27 成都光明光电股份有限公司 Optical glass and optical element
CN106542731B (en) * 2015-09-23 2021-09-10 肖特股份有限公司 Chemically resistant glass and use thereof
JP2018140930A (en) * 2017-02-24 2018-09-13 日本電気硝子株式会社 Optical glass
JP7148880B2 (en) 2017-02-24 2022-10-06 日本電気硝子株式会社 optical glass

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Application publication date: 20090819