CN115536267A - Optical glass, preform and optical element - Google Patents
Optical glass, preform and optical element Download PDFInfo
- Publication number
- CN115536267A CN115536267A CN202211199050.8A CN202211199050A CN115536267A CN 115536267 A CN115536267 A CN 115536267A CN 202211199050 A CN202211199050 A CN 202211199050A CN 115536267 A CN115536267 A CN 115536267A
- Authority
- CN
- China
- Prior art keywords
- less
- component
- glass
- further preferably
- content
- 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.)
- Pending
Links
Images
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
- C03C4/20—Compositions for glass with special properties for chemical resistant glass
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Provided are an optical glass, a preform and an optical element. The invention provides an optical glass, and a preform and an optical element using the optical glass. The optical glass has the optical characteristics of medium refractive index and low dispersion, good chemical durability and small specific gravity. The optical glass is characterized in that the optical glass,contains B in mass% 2 O 3 More than 0 to 45.0% of La 2 O 3 15.0 to 55.0% of Al 2 O 3 The component (c) is more than 0 to 30.0%, the chemical durability (acid resistance) measured by a powder method is 1-4 grade, and the refractive index (n) is 1.62-1.85 d ) And has an Abbe number (v) of 40 to 65 d )。
Description
The application is a divisional application with the application number of 201810768582.6, the application date of 2018, 7 and 13, and the name of the application is optical glass, a preform and an optical element.
Technical Field
The invention relates to an optical glass, a preform and an optical element.
Background
In recent years, digitalization and high definition of devices using an optical system have been rapidly advancing, and in the field of various optical devices such as image capturing devices such as digital cameras and video cameras, and image reproducing (projection) devices such as projectors and projection televisions, there is an increasing demand for reducing the number of optical elements such as lenses and prisms used in the optical system, and for reducing the weight and size of the entire optical system.
In the optical glass for manufacturing optical elements, the refractive index (n) of more than 1.62, which can realize the light weight, the miniaturization and the chromatic aberration correction of the whole optical system d ) And has an Abbe number (v) of 40 to 65 d ) The demand for medium refractive index low dispersion glass is very high.
As such medium refractive index low dispersion glass, glass compositions represented by patent documents 1 to 2 are known. However, from these B 2 O 3 -La 2 O 3 Glass compositions having such a constitution are often susceptible to water and acids in terms of the characteristics of glass components generally used, and their durability is insufficient. Therefore, when the glass is polished, the glass may be deteriorated, and a defect may occur in the manufacturing process.
In addition, since surveillance cameras, in-vehicle cameras, and the like, which are increasingly demanded in recent years, are often used outdoors, they are often exposed to wind, rain, water vapor in the atmosphere, and the like. When an image sensor using a conventional glass composition is used for a long time in the outside, the durability is not sufficient due to the glass components described in patent documents 1 to 2.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open No. 55-080736
Patent document 2: japanese patent laid-open publication No. 11-139844
Disclosure of Invention
The present invention has been made in view of the above problems. The present invention has an object to obtain an optical glass having optical constants in the above-mentioned predetermined range, good chemical durability and a small specific gravity.
The present inventors have made extensive experimental studies to solve the above problems, and as a result, have found that: by adjusting the content of each component to B 2 O 3 More than 0 to 45.0% of La 2 O 3 15.0 to 55.0% of Al 2 O 3 The content of the component (B) exceeds 0 to 30.0%, and a glass which solves the above problems can be obtained. Specifically, the present invention provides the following.
(1) An optical glass in which, in mass%,
comprises the following components: b is 2 O 3 More than 0 to 45.0 percent of component,
La 2 O 3 15.0 to 55.0 percent of component,
Al 2 O 3 The content of the components exceeds 0 to 30.0 percent,
chemical durability (acid resistance) measured by the powder method is 1-4 grade,
it has a refractive index (n) of 1.62 to 1.85 d ) And has an Abbe number (v) of 40 to 65 d )。
(2) The optical glass according to (1), wherein (SiO) 2 +Al 2 O 3 +Ln 2 O 3 )/
(RO+Rn 2 O+ZnO+B 2 O 3 + nd x 10) has a quotient of 0.50 or more (where Ln is selected from one or more of La, gd, Y and Lu, R is selected from one or more of Mg, ca, sr and Ba, rn is selected from one or more of Li, na and KAbove).
(3) A preform comprising the optical glass of (1) or (2).
(4) An optical element comprising the optical glass according to any one of (1) to (2).
(5) An optical device comprising the optical element described in (4).
According to the present invention, a glass having optical constants in a predetermined range and good chemical durability can be obtained.
Drawings
FIG. 1 shows the refractive index (n) of a glass according to an embodiment of the present invention d ) And Abbe number (v) d ) A graph of the relationship of (1).
Detailed Description
The embodiments of the glass of the present invention will be described in detail below, but the present invention is not limited to any of the embodiments below, and can be implemented with appropriate modifications within the scope of the object of the present invention. Note that, although the description of the parts to be described repeatedly may be appropriately omitted, the invention is not limited thereto.
[ glass composition ]
The compositional ranges of the respective components constituting the optical glass of the present invention are described below. In the present specification, unless otherwise specified, the total content of each component is expressed as mass% of the total amount of glass material in terms of oxide. Here, the "composition in terms of oxide" is a composition of each component contained in the marker glass assuming that all oxides, complex salts, metal fluorides, and the like used as raw materials of the glass constituent components of the present invention are decomposed and converted into oxides when melted, assuming that the total mass of the generated oxides is 100 mass%.
B 2 O 3 Component (c) is an essential component, and when it is contained in an amount exceeding 0%, it has an effect of improving meltability and resistance to devitrification. Thus, B 2 O 3 The content of the component (b) is preferably more than 0%, more preferably 5.0% or more, further preferably 10.0% or more, further preferably 15.0% or more, further preferably 20.0% or more, most preferably 25%More than 0%.
On the other hand, by mixing B 2 O 3 The content of the component (c) is 45.0% or less, and deterioration of chemical durability of the glass can be suppressed. Thus, B 2 O 3 The content of the component (b) is preferably 45.0% or less, more preferably 40.0% or less, more preferably 35.0% or less, and further preferably 33.0% or less.
B 2 O 3 Component (C) can use H 3 BO 3 、Na 2 B 4 O 7 、Na 2 B 4 O 7 ·10H 2 O、BPO 4 And the like as a raw material.
La 2 O 3 Component (b) is an essential component, and when 15.0% or more is contained, the refractive index of the glass is increased and the Abbe number of the glass is increased. Thus, la 2 O 3 The content of the component (b) is preferably 15.0% or more, more preferably 18.0% or more, further preferably 20.0% or more, and further preferably 23.0% or more. Particularly preferably, in the case where an optical glass having a refractive index of 1.73 or more is required, la 2 O 3 The component (C) is 40.0% or more. By mixing La 2 O 3 The composition is 40.0 or more, and high refraction is easily obtained while chemical durability is improved.
On the other hand, by mixing La 2 O 3 The content of the component (A) is 55.0% or less, and the glass has improved stability and reduced devitrification. Thus, la 2 O 3 The content of the component (b) is preferably 55.0% or less, more preferably 53.0% or less, and still more preferably 50.0% or less.
La 2 O 3 Component (C) La may be used 2 O 3 、La(NO 3 ) 3 ·XH 2 O (X is an arbitrary integer), and the like as a raw material.
Al 2 O 3 The component (B) is an essential component and has the effect of improving resistance to devitrification and chemical durability. Thus, al 2 O 3 The content of component (c) is preferably more than 0%, more preferably 0.5% or more, further preferably 1.0% or more, further preferably 1.5% or more, and further preferably more than 2.0%, most preferably more than 3.0%. Particularly, the content of SiO is 10.0% or more 2 In the case of the component (B), al is preferably used 2 O 3 The content of the component (C) is 8.0% or more. Thus, siO can be suppressed 2 Crystallization by the component (A) gives a glass having excellent devitrification resistance.
On the other hand, by mixing Al 2 O 3 The content of the component is 30.0% or less, and excessive Al content can be prevented 2 O 3 Deterioration of resistance to devitrification and reduction of refractive index due to the component. Thus, al 2 O 3 The content of the component (b) is preferably 30.0% or less, more preferably 28.0% or less, further preferably 26.0% or less, further preferably 24.0% or less, further preferably 22.0% or less, further preferably 20.0% or less.
Al 2 O 3 Component (C), al can be used 2 O 3 、Al(OH) 3 、AlF 3 、Al(PO 3 ) 3 And the like as a raw material.
SiO 2 When the component (C) is an optional component and contained in an amount exceeding 0%, devitrification resistance and chemical durability are improved. Thus, siO 2 The content of the component (b) is preferably more than 0%, more preferably 3.0% or more, and further preferably 5.0% or more.
On the other hand, by mixing SiO 2 When the content of the component is less than 40.0%, a larger refractive index can be easily obtained, and deterioration of meltability and excessive increase in viscosity can be suppressed. Thus, siO 2 The content of component (c) is preferably less than 40.0%, more preferably 38.0% or less, still more preferably 35.0% or less, and still more preferably 30.0% or less.
SiO 2 Component (B) SiO may be used 2 、K 2 SiF 6 、Na 2 SiF 6 And the like as a raw material.
The sum (mass sum) of the contents of RO components (in the formula, R is one or more selected from the group consisting of Mg, ca, sr, ba) is preferably less than 30.0%. This can suppress deterioration of chemical durability and deterioration of resistance to devitrification due to the excessive RO component.
Therefore, the sum of the masses of the RO components is preferably less than 30.0%, more preferably less than 20.0%, more preferably less than 10.0%, more preferably 8.0% or less, and still more preferably less than 5.0%.
Preferably, ln 2 O 3 The sum (mass sum) of the contents of the components (Ln is at least one selected from the group consisting of La, gd, Y and Lu) is in the range of 30.0% to 70.0%.
In particular, by setting the sum to 30.0% or more, the refractive index and abbe number of the glass can be increased, and therefore, a glass having a desired refractive index and abbe number can be easily obtained. Thus, ln 2 O 3 The sum of the mass of the components is preferably 30.0% or more, more preferably 35.0% or more, further preferably 40.0% or more, and further preferably 45.0% or more.
On the other hand, by setting the sum to 70.0% or less, the liquidus temperature of the glass decreases, and therefore, devitrification of the glass can be reduced. Thus, ln 2 O 3 The sum of the mass of the components is preferably 70.0% or less, more preferably 65.0% or less, and still more preferably 63.0% or less.
In mass ratio (SiO) 2 +Al 2 O 3 )/(B 2 O 3 ) When the amount is 0.1 or more, the effect of improving the chemical durability of the glass is easily obtained. Thus, (SiO) 2 +Al 2 O 3 )/(B 2 O 3 ) The mass ratio of (a) is preferably 0.1 or more, more preferably 0.2 or more, further preferably 0.23 or more, and further preferably 0.5 or more.
On the other hand, by setting the mass ratio to 10.0 or less, deterioration of the meltability of the glass raw material and excessive increase in viscosity can be suppressed. Thus, (SiO) 2 +Al 2 O 3 )/(B 2 O 3 ) The mass ratio of (b) is not particularly limited, but is preferably 10.0 or less, more preferably 8.0 or less, further preferably 6.0 or less, further preferably 5.0 or less, further preferably 4.0 or less, further preferably 3.0 or less, further preferably 2.0 or less, and most preferably 1.0 or less.
In addition, in the absence of B 2 O 3 In the case of component (C), (SiO) 2 +Al 2 O 3 )/(B 2 O 3 ) The value of (d) is set to infinity.
At a mass ratio (Al) 2 O 3 /Ln 2 O 3 ) When the amount is 0.01 or more, the effect of improving the devitrification resistance is easily obtained.
Thus, (Al) 2 O 3 /Ln 2 O 3 ) The mass ratio of (a) is preferably 0.01 or more, more preferably 0.03 or more, further preferably 0.05 or more, further preferably 0.08 or more, and most preferably 0.10 or more.
On the other hand, by setting the mass ratio to 1.0 or less, deterioration of the meltability of the glass raw material and excessive increase in viscosity can be suppressed. Thus, (Al) 2 O 3 /Ln 2 O 3 ) The mass ratio of (a) is preferably 1.0 or less, more preferably 0.9 or less, further preferably 0.8 or less, further preferably 0.7 or less, further preferably 0.6 or less, and most preferably 0.55 or less.
In addition, in the absence of Ln 2 O 3 In the case of component (B), al is added 2 O 3 /Ln 2 O 3 The value of (d) is set to infinity.
In (SiO) 2 +Al 2 O 3 +Ln 2 O 3 )/(RO+Rn 2 O+ZnO+B 2 O 3 + nd × 10) is 0.50 or more, it is easy to obtain desired optical constants while improving chemical durability and resistance to devitrification.
Thus, (SiO) 2 +Al 2 O 3 +Ln 2 O 3 )/(RO+Rn 2 O+ZnO+B 2 O 3 The quotient of + nd × 10) is preferably 0.50 or more, more preferably 0.80 or more, still more preferably 1.00 or more, and most preferably 1.25 or more.
On the other hand, by setting the quotient to 10.00 or less, deterioration of the meltability of the glass raw material and excessive increase of the viscosity can be suppressed. Thus, (SiO) 2 +Al 2 O 3 +Ln 2 O 3 )/(RO+Rn 2 O+ZnO+B 2 O 3 A quotient of + nd × 10) is preferably 10.00 or less, more preferably 8.00 or less, further preferably 5.00 or less, further preferably 4.50 or less, and most preferably 4.30 or less.
Y 2 O 3 When the component (b) is an arbitrary component, and the content exceeds 0%, the material cost of the glass can be suppressed while maintaining a high refractive index and a high abbe number, and the specific gravity of the glass can be reduced as compared with other rare earth components. Thus, Y 2 O 3 The content of the component (b) may be preferably more than 0%, more preferably 1.0% or more, further preferably 3.0% or more, further preferably 5.0% or more, further preferably 8.0% or more, further preferably 10.0% or more.
On the other hand, by mixing Y 2 O 3 The devitrification resistance of the glass can be improved by setting the content of the component to 30.0% or less. Thus, Y 2 O 3 The content of the component (b) is preferably 30.0% or less, more preferably 25.0% or less, further preferably 20.0% or less, and further preferably 15.0% or less.
Y 2 O 3 Component (B) can use Y 2 O 3 、YF 3 And the like as a raw material.
Gd 2 O 3 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and the abbe number can be increased.
On the other hand, the rare earth element is obtained by adding expensive Gd 2 O 3 The optical glass can be produced at a lower cost because the increase in specific gravity can be suppressed and the material cost of the glass can be reduced by setting the component to 35.0% or less. Thus, gd 2 O 3 The content of the component (b) is preferably 35.0% or less, more preferably 30.0% or less, further preferably 25.0% or less, and further preferably 20.0% or less.
In particular by reacting Gd 2 O 3 When the component is less than 10.0%, the material cost can be further reduced. Thus, gd 2 O 3 The content of the component (B) is preferably less than 10.0%, more preferably less than 5.0%, still more preferably less than 1.0%, still more preferably less thanAt 0.1%. Gd may not be contained from the viewpoint of reducing the material cost and suppressing the increase in specific gravity 2 O 3 And (3) components.
Gd 2 O 3 Component (B) can use Gd 2 O 3 、GdF 3 And the like as a raw material.
Lu 2 O 3 The component (b) is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and the abbe number can be increased.
On the other hand, due to the addition of Lu 2 O 3 The content of the component (b) of 10.0% or less lowers the material cost of the glass, and therefore, the optical glass can be produced at a lower cost. In addition, this can improve the resistance to devitrification of the glass. Thus, lu 2 O 3 The content of component (c) is preferably 10.0% or less, more preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, further preferably 0.1% or less. Lu may not be contained from the viewpoint of reducing the material cost 2 O 3 And (3) components.
Lu 2 O 3 Ingredient Lu can be used 2 O 3 And the like as a raw material.
Yb 2 O 3 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and the abbe number can be increased.
On the other hand, by mixing Yb 2 O 3 The content of the component (b) is 10.0% or less, which reduces the material cost of the glass, and thus the optical glass can be produced at a lower cost. In addition, this can improve the resistance to devitrification of the glass. Thus, yb 2 O 3 The content of the component (b) is preferably 10.0% or less, more preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, further preferably 0.1% or less. Yb may not be contained from the viewpoint of reducing the material cost 2 O 3 And (3) components.
Yb 2 O 3 Component Yb may be used 2 O 3 And the like as a raw material.
ZrO 2 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index and abbe number of the glass can be increased and devitrification resistance can be improved.
On the other hand, by reacting ZrO 2 The content of the component (A) is 10.0% or less, and the content of excess ZrO due to the component (A) can be reduced 2 Devitrification due to ingredients. Thus, zrO 2 The content of the component (b) is preferably 10.0% or less, more preferably 7.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, further preferably 2.0% or less, further preferably 1.0% or less, further preferably 0.1% or less.
ZrO 2 Component (b) ZrO may be used 2 、ZrF 4 And the like as a raw material.
TiO 2 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased.
On the other hand, by mixing TiO 2 The content of the component (C) is 10.0% or less, and the excessive content of TiO can be reduced 2 Devitrification due to the component(s) can suppress a decrease in the transmittance of the glass to visible light (particularly, a wavelength of 500nm or less). Thus, tiO 2 The content of the component (b) is preferably 10.0% or less, more preferably 8.0% or less, further preferably 6.0% or less, further preferably 4.0% or less, further preferably 2.0% or less, further preferably 1.0% or less, further preferably 0.5% or less, further preferably 0.1% or less.
Nb 2 The O5 component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased.
On the other hand, by mixing Nb 2 O 5 The content of the component is set to 15.0% or less, and the content of excess Nb can be reduced 2 O 5 Devitrification due to the component(s) and a decrease in the transmittance of the glass to visible light (particularly, a wavelength of 500nm or less) can be suppressed. Thus, nb 2 O 5 The content of the component (b) is preferably 15.0% or less, more preferably 12.0% or less, further preferably 10.0% or less, further preferably 8.0% or less, further preferably 5.0% or less, further preferably 4.0% or lessThe following steps.
Nb 2 O 5 Component (b) Nb 2 O 5 And the like as a raw material.
Ta 2 O 5 The component (b) is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and resistance to devitrification can be improved.
On the other hand, due to the use of expensive Ta 2 O 5 The content of the component (C) is 10.0% or less, and the material cost of the glass is reduced, so that the optical glass can be produced at a lower cost. Thus, ta 2 O 5 The content of the component (b) is preferably 10.0% or less, more preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, further preferably 0.1% or less. Ta may not be contained from the viewpoint of reducing material cost 2 O 5 And (3) components.
Ta 2 O 5 Component (B) Ta 2 O 5 And the like as a raw material.
WO 3 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and resistance to devitrification can be improved.
On the other hand, by mixing WO 3 The content of the component (A) is 10.0% or less, and the content of WO can be reduced 3 The coloring of the glass by the component can improve the visible light transmittance. Thus, WO 3 The content of the component (b) is preferably 10.0% or less, more preferably 8.0% or less, further preferably 6.0% or less, further preferably 4.0% or less, further preferably 1.0% or less, further preferably 0.5% or less, further preferably 0.1% or less.
WO 3 Component (A), WO can be used 3 And the like as a raw material.
The ZnO component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature fusibility is improved.
On the other hand, by setting the content of the ZnO component to 25.0% or less, it is possible to suppress a decrease in abbe number and a decrease in devitrification resistance caused by the excessive content of the ZnO component. Therefore, the content of the ZnO component is preferably 25.0% or less, more preferably 20.0% or less, more preferably 15.0% or less, more preferably 12.0% or less, further preferably 10.0% or less, further preferably 8.0% or less, further preferably 6.0% or less, further preferably 4.0% or less, further preferably 2.0% or less, further preferably 1.0% or less.
As the ZnO component, znO or ZnF can be used 2 And the like as a raw material.
The MgO component is an arbitrary component, and when it is contained in an amount exceeding 0%, the low-temperature fusibility is improved.
On the other hand, by setting the content of the MgO component to 15.0% or less, deterioration of chemical durability and deterioration of devitrification resistance due to the excessive content of the MgO component can be suppressed. Therefore, the content of the MgO component is preferably 15.0% or less, more preferably 10.0% or less, further preferably 8.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
MgO component, mgCO can be used 3 、MgF 2 And the like as a raw material.
The CaO component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature fusibility is improved.
On the other hand, by setting the content of the CaO component to 15.0% or less, it is possible to suppress deterioration of chemical durability and deterioration of devitrification resistance due to the excessive content of the CaO component. Therefore, the content of the CaO component is preferably 15.0% or less, more preferably 10.0% or less, further preferably 8.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, and most preferably 1.0% or less.
CaO component, caCO may be used 3 、CaF 2 And the like as a raw material.
The SrO component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature fusibility is improved.
On the other hand, by setting the content of the SrO component to 15.0% or less, deterioration of chemical durability and deterioration of resistance to devitrification due to excessive SrO component can be suppressed. Therefore, the content of the SrO component is preferably 15.0% or less, more preferably 10.0% or less, further preferably 8.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
SrO component, sr (NO) may be used 3 ) 2 、SrF 2 And the like as a raw material.
The BaO component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature fusibility is improved.
On the other hand, by setting the content of the BaO component to 20.0% or less, deterioration of chemical durability and deterioration of resistance to devitrification due to the excessive content of the BaO component can be suppressed. Therefore, the content of the BaO component is preferably 20.0% or less, more preferably 15.0% or less, more preferably 10.0% or less, further preferably 8.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
BaO component, baCO may be used 3 、Ba(NO 3 ) 2 、BaF 2 And the like as a raw material.
Li 2 The O component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature melting property and the glass formability are improved.
On the other hand, by mixing Li 2 The content of O component is less than 8.0%, and excessive Li content can be prevented 2 Deterioration of chemical durability due to the O component. Thus, li 2 The content of the O component is preferably 8.0% or less, more preferably 6.0% or less, further preferably 5.0% or less, further preferably 4.0% or less, further preferably 3.0% or less, further preferably 2.0% or less, and most preferably 1.0% or less.
Li 2 O component, li can be used 2 CO 3 、LiNO 3 、Li 2 CO 3 And the like as a raw material.
Na 2 The O component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature melting property is improved.
On the other hand, by adding Na 2 Content of O componentSetting the content of Na below 8.0% can inhibit the content of Na excessively 2 Deterioration of chemical durability due to the O component. Thus, na 2 The content of the O component is preferably 8.0% or less, more preferably 6.0% or less, further preferably 4.0% or less, further preferably 2.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
Na 2 As the O component, na may be used 2 CO 3 、NaNO 3 、NaF、Na 2 SiF 6 And the like as a raw material.
K 2 The O component is an optional component, and when it is contained in an amount exceeding 0%, the low-temperature melting property is improved.
On the other hand, by mixing K 2 The content of O component is less than 8.0%, and excessive K content can be prevented 2 Deterioration of chemical durability due to the O component. Thus, K 2 The content of the O component is preferably 8.0% or less, more preferably 6.0% or less, further preferably 4.0% or less, further preferably 2.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
K 2 O component, K can be used 2 CO 3 、KNO 3 、KF、KHF 2 、K 2 SiF 6 And the like as a raw material.
Rn 2 The sum of the contents of O components (Rn is one or more selected from the group consisting of Li, na, and K in the formula) is preferably 8.0% or less. This can suppress the excessive Rn content 2 Deterioration of chemical durability due to the O component. Therefore, the total content (mass sum) is preferably 8.0% or less, more preferably 6.0% or less, further preferably 5.0% or less, further preferably 4.0% or less, further preferably 3.0% or less, further preferably 2.0% or less, and most preferably 1.0% or less.
On the other hand, when the sum exceeds 0%, deterioration of meltability and excessive increase in viscosity can be suppressed. Thus, rn 2 The sum of the mass of the O components is preferably more than 0%, more preferably more than 0.1%, and still more preferably 0.5% or more.
GeO 2 When the component is an arbitrary component and is contained in an amount exceeding 0%, the refractive index of the glass can be increased and resistance to devitrification can be improved.
However, due to GeO 2 Since the raw material (b) is expensive, the production cost increases if the content thereof is large. Thus, geO 2 The content of the component (b) is preferably 10.0% or less, more preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, further preferably 0.1% or less. GeO may not be contained from the viewpoint of reducing the material cost 2 And (3) components.
GeO 2 Component (C), geO can be used 2 And the like as a raw material.
Ga 2 O 3 The component (b) is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index of the glass can be increased and resistance to devitrification can be improved.
However, since Ga 2 O 3 Since the raw material (2) is expensive, the production cost increases if the content is large. Thus, ga 2 O 3 The content of component (c) is preferably 10.0% or less, more preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, further preferably 0.1% or less. From the viewpoint of reducing material cost, ga may not be contained 2 O 3 And (3) components.
Ga 2 O 3 Component (c) Ga may be used 2 O 3 And the like as a raw material.
P 2 O 5 When the content of the component (b) exceeds 0%, the liquidus temperature of the glass can be lowered to improve devitrification resistance.
On the other hand, by adding P 2 O 5 When the content of the component (B) is 30.0% or less, the chemical durability, particularly the water resistance of the glass can be suppressed from lowering. Thus, P 2 O 5 The content of component (c) is preferably 30.0% or less, more preferably 20.0% or less, further preferably 15.0% or less, further preferably 10.0% or less, further preferably 5.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
P 2 O 5 Component (C), al (PO) can be used 3 ) 3 、Ca(PO 3 ) 2 、Ba(PO 3 ) 2 、BPO 4 、H 3 PO 4 And the like as a raw material.
Bi 2 O 3 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index can be increased and the glass transition point can be lowered.
On the other hand, by adding Bi 2 O 3 When the content of the component (C) is 5.0% or less, the glass can be inhibited from being colored and the devitrification resistance can be improved. Thus, bi 2 O 3 The content of the component (b) is preferably 5.0% or less, more preferably 3.0% or less, still more preferably 1.0% or less, and most preferably 0.1% or less.
Bi 2 O 3 Component (B) may use Bi 2 O 3 And the like as a raw material.
TeO 2 The component is an arbitrary component, and when it is contained in an amount exceeding 0%, the refractive index can be increased and the glass transition point can be lowered.
TeO, on the other hand 2 There is a problem that the glass raw material may be alloyed with platinum when the glass raw material is melted in a crucible made of platinum or a melting tank in which a portion in contact with molten glass is made of platinum. Thus, teO 2 The content of the component (b) is preferably 5.0% or less, more preferably 3.0% or less, still more preferably 1.0% or less, and most preferably 0.1% or less.
TeO 2 Component (C), teO can be used 2 And the like as a raw material.
SnO 2 The component (b) is an optional component, and when it is contained in an amount exceeding 0%, the oxidation of the molten glass is reduced to clarify the molten glass and the visible light transmittance of the glass can be improved.
On the other hand, by reacting SnO 2 The content of the component (b) is 3.0% or less, and coloring of the glass due to reduction of the molten glass can be reduced, and devitrification of the glass can be reduced. In addition, the reduction of SnO 2 Alloying of components and melting equipment (particularly, noble metals such as Pt), and therefore, prolonged melting is expectedThe lifetime of the device. Thus, snO 2 The content of the component (b) is preferably 3.0% or less, more preferably 1.0% or less, still more preferably 0.5% or less, and most preferably 0.1% or less.
SnO 2 As the component (B), snO and SnO can be used 2 、SnF 2 、SnF 4 And the like as a raw material.
Sb 2 O 3 The component (b) is an arbitrary component, and when it is contained in an amount exceeding 0%, the molten glass can be defoamed.
On the other hand, if Sb 2 O 3 When the content of the component is too large, the transmittance in a short wavelength region of a visible light region is deteriorated. Thus, sb 2 O 3 The content of the component (b) is preferably 1.0% or less, more preferably 0.7% or less, further preferably 0.5% or less, further preferably 0.2% or less, and most preferably 0.1% or less.
Sb 2 O 3 Component (C), sb may be used 2 O 3 、Sb 2 O 5 、Na 2 H 2 Sb 2 O 7 ·5H 2 O and the like as raw materials.
Further, the component for refining and degassing the glass is not limited to Sb described above 2 O 3 As the component (b), a refining agent, a defoaming agent, or a combination of these agents, which are known in the glass production field, can be used.
The component F is an arbitrary component, and when it is contained in an amount exceeding 0%, the Abbe number of the glass is increased, the glass transition point is lowered, and the devitrification resistance can be improved.
However, if the content of the F component, that is, the total amount of F substituted for a part or all of the oxides of one or two or more of the above metal elements exceeds 15.0%, the amount of volatilization of the F component increases, and therefore, it is difficult to obtain stable optical constants and to obtain homogeneous glass.
Therefore, the content of the component F is preferably 15.0% or less, more preferably 12.0% or less, further preferably 10.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, and most preferably 1.0% or less.
Component F can be obtained by using, for example, zrF 4 、AlF 3 、NaF、CaF 2 Etc. are contained in the glass as raw materials.
In mass sum of (ZrO) 2 +TiO 2 +Nb 2 O 5 +Ta 2 O 5 +WO 3 +Bi 2 O 3 +TeO 2 ) When the content is 20.0% or less, the effect of improving the devitrification resistance is easily obtained, and excessive decrease in the abbe number can be suppressed, and low dispersion performance is easily obtained. Thus, (ZrO) 2 +TiO 2 +Nb 2 O 5 +Ta 2 O 5 +WO 3 +Bi 2 O 3 +TeO 2 ) The sum of mass (c) is preferably 20.0% or less, more preferably 15.0% or less, further preferably 10.0% or less, further preferably 5.0% or less, further preferably 3.0% or less, further preferably 1.0% or less, and most preferably 0.1% or less.
At mass ratio (Ln) 2 O 3 /RO) is 1.0 or more, the effect of improving the chemical durability of the glass is easily obtained.
Thus, (Ln) 2 O 3 /RO) is preferably 1.0 or more, more preferably 3.0 or more, further preferably 5.0 or more, further preferably 10.0 or more, further preferably 20.0 or more, and most preferably 30.0 or more.
Further, since the effect of improving chemical durability is more easily obtained by not containing the RO component, therefore,
(Ln 2 O 3 the upper limit value of the mass ratio of/RO) is not particularly limited, and may be an infinite value.
At mass ratio (Ln) 2 O 3 /Rn 2 O) is 3.0 or more, the effect of improving the chemical durability of the glass is easily obtained.
Therefore, (Ln) 2 O 3 /Rn 2 O) is preferably 3.0 or more, more preferably 5.0 or more, further preferably 8.0 or more, further preferably 10.0 or more, further preferably 15.0 or more, further preferably 20.0 or more, further preferably 25.0 or more, and most preferably 30.0The above.
Moreover, the method does not contain Rn 2 The O component is more likely to have an effect of improving chemical durability, and therefore, (Ln) 2 O 3 /Rn 2 O) is not particularly limited, and may be infinite.
Mass product of (BaO × Gd) 2 O 3 ) When the content is less than 8.0, the effect of suppressing the specific gravity and cost of the glass is easily obtained. Thus, (BaO × Gd) 2 O 3 ) The mass product of (a) is preferably less than 8.0, more preferably 7.0 or less, further preferably 6.0 or less, further preferably 5.0 or less, further preferably 4.0 or less, further preferably 3.0 or less, further preferably 2.0 or less, further preferably 1.0 or less, and most preferably 0.1 or less.
In mass product (SiO) 2 +Al 2 O 3 +B 2 O 3 )×Rn 2 When O is 500 or less, the effect of improving the chemical durability of the glass can be easily obtained while maintaining a high refractive index and a high abbe number. Thus, (SiO) 2 +Al 2 O 3 +B 2 O 3 )×Rn 2 The mass product of O is preferably 500 or less, more preferably 450 or less, further preferably 400 or less, further preferably 350 or less, further preferably 300 or less, further preferably 250 or less, further preferably 200 or less, further preferably 150 or less, and most preferably 100 or less.
In mass Sum of (SiO) 2 +Al 2 O 3 ) When the content is 5.0% or more, the effect of improving the chemical durability of the glass is easily obtained. Thus, (SiO) 2 +Al 2 O 3 ) The sum of mass (c) is preferably 5.0% or more, more preferably 7.0% or more, further preferably 9.0% or more, and further preferably 10.0% or more.
On the other hand, by setting the sum of the masses to 55.0% or less, deterioration of the meltability of the glass raw material and excessive increase in viscosity can be suppressed. Thus, (SiO) 2 +Al 2 O 3 ) The sum of mass (c) is preferably 55.0% or less, more preferably 50.0% or less, more preferably 45.0% or less, and still more preferablyIt is preferably 40.0% or less, more preferably 38.0% or less, still more preferably 35.0% or less, still more preferably 32.0% or less, and most preferably 30.0% or less.
In mass sum of (ZrO) 2 + ZnO) of less than 25.0%, the effect of suppressing the lowering of the abbe number (the increase of the dispersion) is easily obtained. Thus, (ZrO) 2 + ZnO) is preferably less than 25.0%, more preferably less than 20.0%, more preferably less than 15.0%, more preferably less than 10.0%, more preferably 8.5% or less, and even more preferably 6.0% or less.
< about an ingredient which should not be contained >
Next, components that should not be contained in the optical glass of the present invention and components that are not suitable for inclusion will be described.
Other components may be added as necessary within the range not affecting the characteristics of the glass of the present invention. However, when a small amount of each transition metal component such as V, cr, mn, fe, co, ni, cu, ag, and Mo is contained alone or in combination with each other in addition to Ti, zr, nb, W, la, gd, Y, yb, and Lu, the glass is colored even if contained in a small amount, and has a property of absorbing a specific wavelength in the visible region, and therefore, particularly in an optical glass using a wavelength in the visible region, it is preferable that these components are not substantially contained.
Due to Nd 2 O 3 Since the component has a strong influence on the coloring of the glass, it is desirable that Nd is not substantially contained 2 O 3 The component (b) is not completely contained except for inevitable mixing.
Due to Er 2 O 3 Since the component has a strong influence on the coloring of glass, it is desirable that Er is not substantially contained 2 O 3 The component (b) is not completely contained except for inevitable mixing.
Further, since a lead compound such as PbO is a component having a high environmental impact, it is desirable that the lead compound such as PbO is not substantially contained, that is, not completely contained except for unavoidable mixing.
In addition, due to As 2 O 3 The arsenic compound is more environmentally friendlyHigh component, therefore, it does not substantially contain As 2 O 3 The arsenic compounds, etc., are not completely contained except for inevitable mixing.
Further, each component of Th, cd, tl, os, be, and Se tends to Be avoided as a harmful chemical substance in recent years, and therefore, environmental measures are required not only in the glass production process but also in the processing process and the treatment after commercialization. Therefore, when importance is attached to the environmental influence, it is preferable that these components are not substantially contained.
[ physical Properties ]
The optical glass of the present invention preferably has a medium refractive index and a high abbe number (low dispersion). In particular, the refractive index (n) of the optical glass of the present invention d ) Preferably 1.62 or more, more preferably 1.65 or more, more preferably 1.67 or more, and further preferably 1.71 or more. The refractive index (n) d ) Preferably 1.85 or less, more preferably 1.83 or less, and still more preferably 1.82 or less.
Further, the Abbe number (. Nu.) of the optical glass of the present invention d ) Preferably 40 or more, more preferably 43 or more, further preferably 45 or more, further preferably 48 or more, and most preferably 50 or more. The Abbe number (v) d ) Preferably 65 or less, more preferably 63 or less, further preferably 60 or less, and further preferably 57 or less.
By having such an intermediate refractive index, a large amount of light refraction can be obtained even when the optical element is thinned. Further, by having such low dispersion, it is possible to reduce the deviation of focus (chromatic aberration) due to the wavelength of light when used as a single lens. Therefore, for example, when an optical system is configured by combining an optical element having high dispersion (low abbe number), chromatic aberration can be reduced and high image forming characteristics can be realized as the whole optical system.
As described above, the optical glass of the present invention is useful in optical design, and particularly when constituting an optical system, it is possible to achieve miniaturization of the optical system while achieving high imaging characteristics and the like, and to expand the degree of freedom in optical design.
Here, it is preferableIs the refractive index (n) of the optical glass of the present invention d ) And Abbe number (v) d ) Satisfy (-0.01 v) d +2.15)≦n d ≦(-0.01ν d A relation of + 2.30. In the glass of the specific composition of the present invention, the refractive index (n) is d ) And Abbe number (v) d ) By satisfying this relationship, stable glass can be obtained.
Therefore, in the optical glass of the present invention, the refractive index (n) is preferable d ) And Abbe number (v) d ) Satisfies n d ≧(-0.01ν d + 2.15), more preferably n d ≧(-0.01ν d + 2.17).
On the other hand, in the optical glass of the present invention, the refractive index (n) is preferred d ) And Abbe number (v) d ) Satisfies n d ≦(-0.01ν d + 2.30), more preferably n d ≦(-0.01ν d + 2.28).
Preferably, the optical glass of the present invention has a small specific gravity. More specifically, the optical glass of the present invention has a specific gravity of 5.00 or less. This reduces the quality of the optical element and the optical device using the optical element, and therefore contributes to weight reduction of the optical device. Therefore, the specific gravity of the optical glass of the present invention is preferably 5.00 or less, more preferably 4.70 or less, and preferably 4.50 or less. The optical glass of the present invention has a specific gravity of substantially 2.80 or more, more specifically 3.00 or more, and still more specifically 3.20 or more.
The specific gravity of the optical glass of the present invention is measured based on "method for measuring specific gravity of optical glass" of Japan optical glass Industrial Association Standard JOGIS 05-1975.
Preferably, the optical glass of the present invention has high acid resistance. Particularly preferably, the chemical durability (acid resistance) as measured by the powder method of glass based on JOGIS06-2009 is preferably on a scale of 1 to 4, more preferably on a scale of 1 to 3.
This improves the workability of the optical glass, and reduces the clouding of the glass due to acid rain when applied to an in-vehicle application, etc., thereby making it easier to manufacture an optical element from the glass.
Here, "acid resistance" refers to the durability against corrosion of glass by acid, and this acid resistance can be measured by the japanese optical glass institute standard "method for measuring chemical durability of optical glass" JOGIS 06-2009. The phrase "chemical durability (acid resistance) measured by the powder method is on the order of 1 to 3" means that the chemical durability (acid resistance) based on JOGIS06-2009 is a weight loss rate of the sample before and after the measurement, and is less than 0.65% by mass.
Further, "grade 1" of the chemical durability (acid resistance) is a weight loss rate of less than 0.20% by mass of the sample before and after the measurement, "grade 2" is a weight loss rate of 0.20% by mass or more and less than 0.35% by mass of the sample before and after the measurement, "grade 3" is a weight loss rate of 0.35% by mass or more and less than 0.65% by mass of the sample before and after the measurement, "grade 4" is a weight loss rate of 0.65% by mass or more and less than 1.20% by mass of the sample before and after the measurement, "grade 5" is a weight loss rate of 1.20% by mass or more and less than 2.20% by mass of the sample before and after the measurement, and "grade 6" is a weight loss rate of 2.20% by mass or more of the sample before and after the measurement.
Preferably, the product (d × RA) of the specific gravity (d) of the glass and the grade (RA) of acid resistance by the powder method is low. More specifically, the product value of (d × RA) in the present invention is 20.0 or less.
Accordingly, since a lens having excellent acid resistance and a low specific gravity can be manufactured, an optical element having resistance to acid rain and the like and suitable for use in a vehicle, a surveillance camera, or the like can be easily manufactured with reduced weight.
Therefore, the product value of (d × RA) in the present invention is preferably 20.0 or less, more preferably 18.0 or less, further preferably 15.0 or less, and further preferably 13.0 or less.
The lower limit of the product value of (d × RA) of the optical glass of the present invention is not particularly limited, but is generally 1.0 or more, more specifically 2.0 or more, and still more specifically 3.0 or more.
It is preferable that the optical glass of the present invention has high devitrification resistance, more specifically, has a low liquidus temperature.
That is, the liquidus temperature of the optical glass of the present invention is preferably 1300 ℃ or lower, more preferably 1250 ℃ or lower, further preferably 1200 ℃ or lower, further preferably 1150 ℃ or lower, further preferably 1100 ℃ or lower. Thus, even if the melted glass is caused to flow out at a lower temperature, the crystallization of the produced glass is reduced, and therefore, devitrification at the time of forming the glass from a molten state can be reduced, and the influence on the optical characteristics of an optical element using the glass can be reduced. In addition, since the glass can be molded even if the melting temperature of the glass is lowered, the manufacturing cost of the glass can be reduced by suppressing energy consumed in molding the glass.
On the other hand, the lower limit of the liquidus temperature of the optical glass of the present invention is not particularly limited, and the liquidus temperature of the glass produced by the present invention is generally 800 ℃ or higher, specifically 850 ℃ or higher, more specifically 900 ℃ or higher.
The term "liquid phase temperature" as used herein means the lowest temperature at which crystals are not observed when the crystals are observed by a microscope at a magnification of 100 times after being kept in a temperature gradient furnace with a temperature gradient of 1000 to 1300 ℃ for 30 minutes and taken out of the furnace and cooled.
[ production method ]
The optical glass of the present invention is produced, for example, as follows. That is, the raw materials are uniformly mixed so that the respective components are within a predetermined content range, the resulting mixture is put into a platinum crucible, melted in an electric furnace at a temperature range of 1100 to 1350 ℃ for 2 to 6 hours depending on the melting difficulty of the glass composition, stirred and homogenized, then cooled to an appropriate temperature, and then cast into a mold, followed by slow cooling.
[ Molding of glass ]
The glass of the present invention can be melt-formed by a known method. Further, the method of forming the glass melt is not limited.
[ glass molded article and optical element ]
The glass of the present invention can be used to produce a glass shaped product by a method such as grinding and polishing. That is, the glass may be subjected to mechanical processing such as grinding and polishing to produce a glass molded body. Further, the method of manufacturing the glass shaped body is not limited to these methods.
As described above, the glass molded body formed of the glass of the present invention has excellent durability and thus has good workability, and is less likely to be deteriorated by acid rain or the like, and thus can be suitably used for in-vehicle applications or the like.
Examples
Tables 1 to 17 show compositions of examples and comparative examples of glasses of the present invention, and refractive indices (n) of these glasses d ) Abbe number (v) d ) Specific gravity (d), grade of acid resistance by powder method (RA), liquid phase temperature. In addition, the following embodiments are for illustrative purposes only, and the present invention is not limited to these embodiments.
The glasses of examples and comparative examples of the present invention were prepared by selecting, as raw materials for each component, high-purity raw materials used for general optical glasses such as oxides, hydroxides, carbonates, nitrates, fluorides, metaphosphoric acid compounds, etc. corresponding to the above raw materials, weighing and uniformly mixing the raw materials in the proportions of the compositions of the examples shown in the table, charging the mixture into a platinum crucible, melting the mixture in an electric furnace at a temperature range of 1100 to 1350 ℃ for 2 to 5 hours depending on the degree of difficulty of melting the glass composition, stirring the molten mixture to homogenize the molten mixture, casting the homogenized mixture into a mold, etc., and slowly cooling the molten mixture.
Refractive index (n) of glasses of examples and comparative examples d ) And Abbe number (v) d ) The measured value is expressed as d-line (587.56 nm) for a helium lamp. In addition, abbe number (. Nu.) d ) The refractive index of d-line and the refractive index (n) of F-line (486.13 nm) of a hydrogen lamp were used F ) Refractive index (n) relative to C line (656.27 nm) C ) According to Abbe number (v) d )＝[(n d -1)/(n F -n C )]Is calculated by the formula (2).
The specific gravities of the glasses of examples and comparative examples were measured based on "method for measuring specific gravity of optical glass" of Japan optical glass Industrial Association Standard JOGIS 05-1975.
The acid resistance of the glasses of examples and comparative examples was measured based on the japanese optical glass agency standard "method for measuring chemical durability of optical glass" JOGIS 06-2009. That is, a glass sample crushed to a particle size of 425 to 600 μm was put into a pycnometer and put into a platinum basket. A platinum basket was placed in a quartz glass round-bottom flask containing a 0.01N nitric acid aqueous solution, and treated in a boiling water bath for 60 minutes. The weight reduction percentage (% by mass) of the glass sample after the treatment was calculated as class 1 when the weight reduction percentage (% by mass) was less than 0.20, as class 2 when the weight reduction percentage was 0.20 to less than 0.35, as class 3 when the weight reduction percentage was 0.35 to less than 0.65, as class 4 when the weight reduction percentage was 0.65 to less than 1.20, as class 5 when the weight reduction percentage was 1.20 to less than 2.20, and as class 6 when the weight reduction percentage was 2.20 or more. In this case, the smaller the number of steps, the more excellent the acid resistance of the glass.
The liquidus temperature of the glasses of examples and comparative examples was maintained in a temperature gradient furnace having a temperature gradient of 1000 to 1300 ℃ for 30 minutes, and after taking out from the furnace and cooling, the lowest temperature at which crystals were not observed when the presence or absence of crystals was observed by a microscope at a magnification of 100.
In addition, in the case of describing "1000 or less", it means that no crystal is observed at least at 1000 ℃.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
TABLE 6
TABLE 7
TABLE 8
TABLE 9
Watch 10
TABLE 11
TABLE 12
Watch 13
TABLE 14
Watch 15
TABLE 16
TABLE 17
As shown in the table, B is the optical glass of the example of the present invention 2 O 3 The components are more than 0 to 45.0 percent, and La 2 O 3 15.0-55.0% of Al 2 O 3 The content of the component (c) is more than 0 to 30.0%, and therefore, an optical glass having excellent durability and desired optical constants can be obtained.
In addition, the refractive index (n) of the optical glass of the embodiment of the present invention d ) Are all above 1.62, and the refractive index (n) d ) Is 1.85 or less, and is within the desired range.
In addition, the Abbe number (. Nu.) of the optical glass of the example of the present invention d ) Are all 65 or less, and the Abbe number (v) d ) 40 or more, all within the desired range.
In addition, the optical glass of the present invention forms a stable glass, and devitrification is less likely to occur when the glass is produced. This can also be inferred from the fact that the liquidus temperature of the optical glass according to the present invention is 1300 ℃ or lower, more specifically 1150 ℃ or lower.
The specific gravity of the optical glass of the examples of the present invention is 5.00 or less. Therefore, it is understood that the optical glass of the embodiment of the present invention has a small specific gravity.
The chemical durability (acid resistance) of the optical glass of the examples of the present invention measured by the powder method was on the order of 1 to 4, and was within a desired range.
Accordingly, the refractive index (n) of the optical glass of the embodiment of the present invention d ) And Abbe number (v) d ) All fall within the desired range, and all the chemical durability (acid resistance) measured by the powder method are on the order of 1 to 4. Therefore, it is understood that the optical glass of the examples of the present invention is excellent in chemical durability (acid resistance).
On the other hand, due to La of the optical glass of comparative example A 2 O 3 Since the content of the component is 15.0% or less, a vitreous material having excellent chemical durability cannot be obtained in a region of medium refractive index and low dispersion. In addition, since the optical glass of comparative example B does not contain Al 2 O 3 Therefore, the stability of the glass is poor and the glass is not vitrified.
Further, a glass block was formed using the optical glass of the example of the present invention, and the glass block was polished and processed into the shapes of a lens and a prism. As a result, various shapes of lenses and prisms can be stably processed.
The present invention has been described in detail for the purpose of illustration, and the present embodiment is for the purpose of illustration only, and it is to be understood that many more modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (5)
1. An optical glass comprising, in mass%
Mass ratio (Al) 2 O 3 /Ln 2 O 3 ) Is more than 0.08, in the formula, ln is more than 1 selected from the group consisting of La, gd, Y and Lu,
the chemical durability, i.e., acid resistance, measured by the powder method is grade 1 to grade 4,
has a refractive index (n) of 1.62 to 1.85 d ) And has an Abbe number (v) of 40 to 65 d )。
2. The optical glass according to claim 1, wherein (SiO) 2 +Al 2 O 3 +Ln 2 O 3 )/(RO+Rn 2 O+ZnO+B 2 O 3 + nd × 10) is 0.50 or more, where Ln is selected from one or more of the group consisting of La, gd, Y, lu, R is selected from one or more of the group consisting of Mg, ca, sr, ba, and Rn is selected from one or more of the group consisting of Li, na, K.
3. A preform composed of the optical glass according to claim 1 or 2.
4. An optical element comprising the optical glass according to claim 1 or 2.
5. An optical device comprising the optical element according to claim 4.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-141403 | 2017-07-21 | ||
| JP2017141403 | 2017-07-21 | ||
| JP2018-085447 | 2018-04-26 | ||
| JP2018085447 | 2018-04-26 | ||
| JP2018112336A JP7049192B2 (en) | 2017-07-21 | 2018-06-12 | Optical glass, preforms and optical elements |
| JP2018-112336 | 2018-06-12 | ||
| CN201810768582.6A CN109279772B (en) | 2017-07-21 | 2018-07-13 | Optical glass, preform and optical element |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810768582.6A Division CN109279772B (en) | 2017-07-21 | 2018-07-13 | Optical glass, preform and optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115536267A true CN115536267A (en) | 2022-12-30 |
Family
ID=65182480
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211199050.8A Pending CN115536267A (en) | 2017-07-21 | 2018-07-13 | Optical glass, preform and optical element |
| CN201810768582.6A Active CN109279772B (en) | 2017-07-21 | 2018-07-13 | Optical glass, preform and optical element |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810768582.6A Active CN109279772B (en) | 2017-07-21 | 2018-07-13 | Optical glass, preform and optical element |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN115536267A (en) |
| TW (1) | TWI795418B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110963701A (en) * | 2019-12-24 | 2020-04-07 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
| CN112551888B (en) * | 2020-12-30 | 2022-08-19 | 湖北新华光信息材料有限公司 | Optical glass, method for producing same, and optical element |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008019104A (en) * | 2006-07-10 | 2008-01-31 | Ohara Inc | Glass |
| CN103313947A (en) * | 2011-01-18 | 2013-09-18 | 株式会社小原 | Optical glass, preform, and optical element |
| CN104341102A (en) * | 2013-07-31 | 2015-02-11 | 株式会社小原 | Optical glass and optical element |
| CN105565659A (en) * | 2014-10-29 | 2016-05-11 | 株式会社小原 | Optical glass, preformed body, and optical element |
| CN106630595A (en) * | 2010-10-08 | 2017-05-10 | 株式会社小原 | Optical glass, preform material, and optical element |
| CN106746597A (en) * | 2016-12-15 | 2017-05-31 | 成都光明光电股份有限公司 | Optical glass |
| CN106830670A (en) * | 2016-12-30 | 2017-06-13 | 中国科学院西安光学精密机械研究所 | Lanthanum crown LaK3 series space radiation-resistant optical glass and preparation method thereof |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2660012C2 (en) * | 1975-06-02 | 1983-12-22 | Hoya Glass Works, Ltd, Tokyo | Glasses for eye lenses with a refractive index of at least 1.70, an Abbe value of 40 and a specific gravity of not more than 3.0g / cm? 3? |
| JPS526718A (en) * | 1975-07-07 | 1977-01-19 | Nippon Chemical Ind | Optical glass |
| DE2756160A1 (en) * | 1977-12-16 | 1979-06-21 | Ohara Optical Glass Mfg | Optical glass having high refractive and low dispersive properties - and free of poisonous thorium oxide |
| JPS55121925A (en) * | 1979-03-14 | 1980-09-19 | Ohara Inc | Optical glass |
| JPS606297B2 (en) * | 1980-05-30 | 1985-02-16 | 株式会社小原光学硝子製造所 | optical glass |
| DE3201943C2 (en) * | 1982-01-22 | 1986-05-22 | Schott Glaswerke, 6500 Mainz | Optical glass in the system SiO? 2? -B? 2? O? 3? -CaO-La? 2? O? 3? with refractive indices of 1.60 - 1.69 and Abbezahlen? 54 with a particularly low density and particularly good chemical resistance |
| JPS58194755A (en) * | 1982-05-07 | 1983-11-12 | Ohara Inc | Optical glass |
| JPS61163138A (en) * | 1985-01-12 | 1986-07-23 | Nippon Kogaku Kk <Nikon> | Optical glass having high refractive index and low dispersion |
| JP2707010B2 (en) * | 1991-06-21 | 1998-01-28 | 株式会社オハラ | Optical glass |
| CN1174929C (en) * | 1997-06-24 | 2004-11-10 | 株式会社小原 | Optical glass |
| JP3059719B2 (en) * | 1998-04-28 | 2000-07-04 | ホーヤ株式会社 | Optical glass, materials for precision press molding and optical components using it |
| US7138348B2 (en) * | 2001-07-03 | 2006-11-21 | Kabushiki Kaisha Ohara | Optical glass |
| JP4923366B2 (en) * | 2001-09-13 | 2012-04-25 | 日本電気硝子株式会社 | Optical glass for mold press molding |
| JP4305940B2 (en) * | 2001-12-27 | 2009-07-29 | 日本電気硝子株式会社 | Optical glass for mold press molding |
| JP2004175632A (en) * | 2002-11-28 | 2004-06-24 | Hikari Glass Co Ltd | Optical glass |
| JP2004292306A (en) * | 2003-03-12 | 2004-10-21 | Nippon Electric Glass Co Ltd | Optical glass for mold press molding |
| JP2005015302A (en) * | 2003-06-27 | 2005-01-20 | Nippon Electric Glass Co Ltd | Optical glass for mold press molding |
| CN101215083B (en) * | 2007-01-06 | 2011-07-20 | 湖北新华光信息材料有限公司 | Optical glass for precision profiling |
| JP5729798B2 (en) * | 2007-11-08 | 2015-06-03 | 日本電気硝子株式会社 | Glass for optical lenses having a skeleton of TeO2-La2O3-WO3 |
| DE102009011508B4 (en) * | 2009-03-06 | 2017-03-09 | Schott Ag | Optical glass and its use |
-
2018
- 2018-07-10 TW TW107123807A patent/TWI795418B/en active
- 2018-07-13 CN CN202211199050.8A patent/CN115536267A/en active Pending
- 2018-07-13 CN CN201810768582.6A patent/CN109279772B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008019104A (en) * | 2006-07-10 | 2008-01-31 | Ohara Inc | Glass |
| CN106630595A (en) * | 2010-10-08 | 2017-05-10 | 株式会社小原 | Optical glass, preform material, and optical element |
| CN103313947A (en) * | 2011-01-18 | 2013-09-18 | 株式会社小原 | Optical glass, preform, and optical element |
| CN104341102A (en) * | 2013-07-31 | 2015-02-11 | 株式会社小原 | Optical glass and optical element |
| CN105565659A (en) * | 2014-10-29 | 2016-05-11 | 株式会社小原 | Optical glass, preformed body, and optical element |
| CN106746597A (en) * | 2016-12-15 | 2017-05-31 | 成都光明光电股份有限公司 | Optical glass |
| CN106830670A (en) * | 2016-12-30 | 2017-06-13 | 中国科学院西安光学精密机械研究所 | Lanthanum crown LaK3 series space radiation-resistant optical glass and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109279772A (en) | 2019-01-29 |
| TWI795418B (en) | 2023-03-11 |
| TW201908257A (en) | 2019-03-01 |
| CN109279772B (en) | 2022-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6740422B2 (en) | Optical glass and optical element | |
| CN109415240B (en) | Optical glass, preform and optical module | |
| CN109415239B (en) | Optical glass, preform and optical component | |
| JP6096502B2 (en) | Optical glass and optical element | |
| WO2013094619A1 (en) | Optical glass and optical element | |
| CN111406039A (en) | Optical glass, preform, and optical element | |
| JP2019147724A (en) | Optical glass, preform, and optical element | |
| WO2018003582A1 (en) | Optical glass, preform, and optical element | |
| JP2018052764A (en) | Optical glass, preform, and optical element | |
| JP2019147725A (en) | Optical glass, preform, and optical element | |
| CN109279772B (en) | Optical glass, preform and optical element | |
| JPWO2019031095A1 (en) | Optical glass, optical element and optical equipment | |
| JP7424978B2 (en) | Optical glass, preforms and optical elements | |
| JP2019194139A (en) | Optical glass, preform and optical element | |
| JP7049192B2 (en) | Optical glass, preforms and optical elements | |
| CN108129018B (en) | Optical glass, preform and optical element | |
| JP6973905B2 (en) | Optical glass, preforms and optics | |
| WO2018154960A1 (en) | Optical glass, preform and optical element | |
| WO2020262014A1 (en) | Optical glass, preform, and optical element | |
| TWI817938B (en) | Optical glass, preform structures and optical components |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |