CN110372203B - Optical glass and optical element - Google Patents

Optical glass and optical element Download PDF

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CN110372203B
CN110372203B CN201910294313.5A CN201910294313A CN110372203B CN 110372203 B CN110372203 B CN 110372203B CN 201910294313 A CN201910294313 A CN 201910294313A CN 110372203 B CN110372203 B CN 110372203B
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glass
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CN110372203A (en
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桑谷俊伍
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Hoya Corp
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Hoya Corp
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    • 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

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)

Abstract

The present invention provides an optical glass having a desired optical constant and a small specific gravity, and an optical element including the optical glass. An optical glass having an Abbe number ν d of 35 to 39, B 2 O 3 The content of (A) is 12-26 mass%, La 2 O 3 29 to 46 mass%, ZnO 18 to 28 mass%, and SiO 2 The content of (A) is more than 0 mass% and 10 mass% or less, TiO 2 Is more than 0 mass% and not more than 12 mass%, ZrO 2 Has a content of more than 0 mass% and not more than 4.85 mass%, Gd 2 O 3 0 to 5 mass%, CaO 0 to 12 mass%, and Ta 2 O 5 0 to 2.5 mass%, Y 2 O 3 0 to 5 mass%, Nb 2 O 5 And WO 3 Total content of [ Nb ] 2 O 5 +WO 3 ]0 to 6 mass%.

Description

Optical glass and optical element
Technical Field
The present invention relates to an optical glass and an optical element.
Background
Patent document 1 discloses a method of making Nb 2 O 5 And WO 3 These optical glasses have a low amount of glass components used, which are expensive in raw materials. However, in the optical glass disclosed in the example of patent document 1, if the abbe number vd is 35 to 39, a large amount of Y is used 2 O 3 This component having a high raw material cost and BaO is a component that is a factor of increasing the specific gravity. Therefore, an optical glass having desired optical constants, and having low raw material cost and further having higher performance is desired.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-88482.
Disclosure of Invention
Problems to be solved by the invention
In an optical element mounted on an optical system of an autofocus system, weight reduction is required to reduce power consumption when driving an autofocus function. If the specific gravity of glass can be reduced, the weight of an optical element such as a lens can be reduced.
Accordingly, an object of the present invention is to provide an optical glass having a desired optical constant and a small specific gravity, and an optical element including the optical glass.
Means for solving the problems
The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found that the object can be achieved by adjusting the content ratio of each glass constituent component (hereinafter referred to as "glass component") constituting a glass, and have completed the present invention based on this finding.
That is, the main contents of the present invention are as follows.
(1) A kind of optical glass is disclosed, which has a transparent glass body,
the Abbe number vd is 35-39,
B 2 O 3 the content of (B) is 12 to 26% by mass,
La 2 O 3 the content of (B) is 29 to 46% by mass,
the content of ZnO is 18 to 28 mass%,
SiO 2 the content of (B) is more than 0 mass% and 10 mass% or less,
TiO 2 the content of (B) is more than 0 mass% and not more than 12 mass%,
ZrO 2 the content of (B) is more than 0 mass% and 4.85 mass% or less,
Gd 2 O 3 the content of (B) is 0 to 5% by mass,
the content of CaO is 0 to 12 mass%,
Ta 2 O 5 the content of (B) is 0 to 2.5 mass%,
Y 2 O 3 the content of (B) is 0 to 5% by mass,
Nb 2 O 5 and WO 3 Total content of [ Nb ] 2 O 5 +WO 3 ]0 to 6 mass%.
(2) An optical element comprising the optical glass according to the above (1).
Effects of the invention
According to the present invention, it is possible to provide an optical glass having a desired optical constant and a small specific gravity, and an optical element including the optical glass.
Detailed Description
Hereinafter, embodiments of the present invention will be described. In the present invention and the present specification, the glass composition of the optical glass is expressed on an oxide basis unless otherwise specified. Here, the "oxide-based glass composition" refers to a glass composition obtained by converting the glass raw material into a glass composition in which all of the glass raw material is decomposed at the time of melting and exists as an oxide in the optical glass, and the expression of each glass component is conventionally described as SiO 2 、TiO 2 And the like. The content and total content of the glass components are based on mass unless otherwise specified, and "%" means "% by mass".
The content of the glass component can be determined by a known method such as inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), or the like. In the present specification and the present invention, the content of 0% of a constituent means that the constituent is not substantially contained, and the constituent is allowed to be contained at a level of inevitable impurities.
In the present specification, the refractive index nd of helium d-line (wavelength 587.56nm) is used unless otherwise specified.
The abbe number ν d is used as a value indicating the property of chromatic dispersion and is represented by the following formula. Here, nF is the refractive index of the F line (wavelength 486.13nm) of blue hydrogen, and nC is the refractive index of the C line (656.27nm) of red hydrogen.
νd＝(nd-1)/(nF-nC)
The optical glass of the present embodiment is characterized in that,
the Abbe number vd is 35-39,
B 2 O 3 the content of (a) is 12-26%,
La 2 O 3 the content of (B) is 29-46%,
the content of ZnO is 18-28%,
SiO 2 the content of (B) is more than 0% and 10% or less,
TiO 2 the content of (B) is more than 0% and not more than 12%,
ZrO 2 the content of (B) is more than 0% and 4.85% or less,
Gd 2 O 3 the content of (a) is 0 to 5%,
the content of CaO is 0-12%,
Ta 2 O 5 the content of (B) is 0-2.5%,
Y 2 O 3 the content of (a) is 0 to 5%,
Nb 2 O 5 and WO 3 Total content of [ Nb ] 2 O 5 +WO 3 ]0 to 6%.
In the optical glass of the present embodiment, B 2 O 3 The content of (A) is 12-26%. B is 2 O 3 The upper limit of the content of (b) is preferably 24%, and more preferably 23%, 22%, 21% in this order. In addition, B 2 O 3 The lower limit of the content of (b) is preferably 14%, and more preferably 15%, 16%, and 17% in this order.
When B is present 2 O 3 When the content of (b) is too large, the refractive index nd decreases, and an optical glass having desired optical constants cannot be obtained. In addition, when B 2 O 3 When the content of (b) is too small, the thermal stability of the glass may be lowered.
In the optical glass of the present embodiment, La 2 O 3 The content of (A) is 29-46%. La 2 O 3 The upper limit of the content of (b) is preferably 44%, and more preferably 43%, 42%, and 41% in this order. Further, La 2 O 3 The lower limit of the content of (b) is preferably 31%, and more preferably 33%, 35%, and 37% in this order.
When La 2 O 3 If the content of (b) is too large, the thermal stability of the glass may be lowered and the specific gravity may be increased. Furthermore, when La 2 O 3 When the content of (b) is too small, the refractive index nd decreases, and an optical glass having desired optical constants cannot be obtained.
In the optical glass of the present embodiment, the content of ZnO is 18 to 28%. The upper limit of the ZnO content is preferably 27.5%, and more preferably 27%, 26.5%, and 26% in this order. The lower limit of the ZnO content is preferably 19%, and more preferably 20%, 21%, and 22% in this order.
When the content of ZnO is too large, there is a risk that the thermal stability of the glass is lowered. When the content of ZnO is too small, the glass raw material is likely to remain melted during melting of the glass.
In the optical glass of the present embodiment, SiO 2 The content of (b) is more than 0% and 10% or less. SiO 2 2 The upper limit of the content of (b) is preferably 9%, and more preferably 8%, 7%, and 6.5% in this order. Furthermore, SiO 2 The lower limit of the content of (b) is preferably 1%, and more preferably 2%, 3%, and 3.5% in this order.
When SiO is present 2 When the content of (b) is too large, the refractive index nd decreases, and an optical glass having desired optical constants cannot be obtained. In addition, when glass is melted, a residual melted glass raw material is likely to be generated. When SiO is present 2 When the content of (b) is too small, the thermal stability of the glass may be lowered.
In the optical glass of the present embodiment, TiO 2 The content of (b) is more than 0% and 12% or less. TiO 2 2 The upper limit of the content of (b) is preferably 11%, and more preferably 10%, 9.5% or 9%. Furthermore, TiO 2 The lower limit of the content of (b) is preferably 2%, and more preferably 3%, 4%, and 5% in this order.
When TiO is present 2 If the content of (b) is too large, the glass may be colored and the transmittance may be decreased. In addition, when TiO 2 When the content of (b) is too small, the refractive index nd decreases, and an optical glass having desired optical constants cannot be obtained. Further, in TiO 2 When the content of (A) is small, Nb needs to be increased in order to obtain an optical glass having desired optical constants 2 O 5 Or WO 3 The content of these other high refractive index components has the consequence that there is a risk of an increase in the cost of raw materials.
In the optical glass of the present embodiment, ZrO 2 The content of (B) is more than 0% and 4.85% or less. ZrO (ZrO) 2 The upper limit of the content of (b) is preferably 4.5%, and more preferably 4%, 3.7%, and 3.5% in this order. Furthermore, ZrO 2 The lower limit of the content of (b) is preferably 1%, and more preferably 1.5%, 1.8%, and 2% in this order.
When ZrO 2 If the content of (b) is too large, there is a risk of increasing the specific gravity.
In the optical glass of the present embodiment, Gd 2 O 3 The content of (A) is 0-5%. Gd (Gd) 2 O 3 The upper limit of the content of (b) is preferably 4%, and more preferably 3%, 2%, and 1% in this order. In addition, Gd 2 O 3 The smaller the content of (B) is, the more preferable is the content thereof, and the content thereof may be 0%.
When Gd is present 2 O 3 If the content of (b) is too large, there is a risk that the specific gravity increases and the cost of raw materials increases.
In the optical glass of the present embodiment, the content of CaO is 0 to 12%. The upper limit of the content of CaO is preferably 9%, and more preferably 7%, 5%, and 4% in this order. The lower limit of the CaO content is preferably 1%, and more preferably 2%, 3%, and 4% in this order. The content of CaO may be 0%.
When the content of CaO is too large, there is a risk that the chemical durability of the glass is lowered.
In the optical glass of the present embodiment, Ta 2 O 5 The content of (A) is 0-2.5%. Ta 2 O 5 The upper limit of the content of (b) is preferably 2%, and more preferably 1.5%, 1%, and 0.5% in this order. Further, Ta 2 O 5 The smaller the content of (B) is, the more preferable is the content thereof, and the content thereof may be 0%.
When Ta 2 O 5 If the content of (b) is too large, there is a risk of increasing the cost of raw materials.
In the optical glass of the present embodiment, Y is 2 O 3 The content of (A) is 0-5%. Y is 2 O 3 The upper limit of the content of (b) is preferably 4%, and more preferably 3.5%, 3%, and 2.5% in this order. Furthermore, Y 2 O 3 The smaller the content of (B) is, the more preferable is the content thereof, and the content thereof may be 0%.
When Y is 2 O 3 If the content of (b) is too large, the specific gravity increases and the cost of raw materials increases.
In the optical glass of the present embodiment, Nb 2 O 5 And WO 3 Total content of [ Nb ] 2 O 5 +WO 3 ]0 to 6%. Total content [ Nb 2 O 5 +WO 3 ]The upper limit of (b) is preferably 5%, and more preferably 4%, 3.5%, and 3% in this order. Further, the total content [ Nb ] 2 O 5 +WO 3 ]The smaller the amount, the more preferable the amount is, and may be 0%.
When the total content is [ Nb ] 2 O 5 +WO 3 ]If the amount is too large, the specific gravity may increase and the cost of the raw material may increase.
The contents and ratios of the glass components other than those described above in the optical glass of the present embodiment will be described in detail below.
In the optical glass of the present embodiment, SiO 2 And B 2 O 3 Total content of [ SiO ] 2 +B 2 O 3 ]The upper limit of (b) is preferably 35%, and more preferably 32%, 30%, and 28% in this order. Further, the total content [ SiO ] 2 +B 2 O 3 ]The lower limit of the content of (b) is preferably 18%, and more preferably 20%, 21%, and 22% in this order. By mixing the total content of [ SiO ] 2 +B 2 O 3 ]By setting the above range, thermal stability of the glass can be improved and desired optical constants can be obtained.
In the optical glass of the present embodiment, P 2 O 5 The upper limit of the content of (b) is preferably 5%, and more preferably 3%, 2%, and 1% in this order. P 2 O 5 The content of (b) may be 0%. By adding P 2 O 5 The content of (b) is in the above range, whereby the thermal stability of the glass can be maintained.
In the optical glass of the present embodiment, Al 2 O 3 The upper limit of the content of (b) is preferably 5%, and more preferably 4%, 3%, and 2% in this order. Al (Al) 2 O 3 The content of (b) may be 0%. By mixing Al 2 O 3 The content of (b) is in the above range, whereby devitrification resistance and thermal stability of the glass can be maintained.
In the optical glass of the present embodiment, Nb 2 O 5 The upper limit of the content of (b) is preferably 6%, and more preferably 5%, 4%, and 3% in this order. Further, Nb 2 O 5 The lower content of (b) is more preferable, and the lower limit thereof is preferably 0%. Nb 2 O 5 The content of (b) may be 0%. By adding Nb 2 O 5 When the content of (b) is in the above range, the coloring of the glass can be reduced, and the increase in specific gravity and the increase in raw material cost can be suppressed.
In the optical glass of the present embodiment, WO 3 The upper limit of the content of (b) is preferably 6%, and more preferably 5%, 4%, and 3% in this order. In addition, WO 3 The lower content of (b) is more preferable, and the lower limit thereof is preferably 0%. WO 3 The content of (b) may be 0%. By mixing WO 3 When the content of (b) is in the above range, the coloring of the glass can be reduced, and the increase in specific gravity and the increase in raw material cost can be suppressed.
In the optical glass of the present embodiment, TiO 2 、Nb 2 O 5 And WO 3 In total amount based on TiO 2 (ii) mass ratio of contents of [ (TiO) 2 +Nb 2 O 5 +WO 3 )/TiO 2 ]The smaller the size, the more preferable the size, and the lower limit of the size is preferably 1. Further, mass ratio [ (TiO) 2 +Nb 2 O 5 +WO 3 )/TiO 2 ]The upper limit of the content of (b) is preferably 3, and more preferably 2.5, 2.2 and 2 in this order. By mixing the mass ratio of [ (TiO) 2 +Nb 2 O 5 +WO 3 )/TiO 2 ]By setting the above range, it is possible to realize desired optical constants while suppressing an increase in raw material cost.
In the optical glass of the present embodiment, Bi 2 O 3 The upper limit of the content of (b) is preferably 5%, and more preferably 4%, 3.5%, and 3% in this order. In addition, Bi 2 O 3 The lower limit of the content of (b) is preferably 0%. Bi 2 O 3 The content of (b) may be 0%. By adding Bi 2 O 3 The content of (b) is within the above range, so that the thermal stability of the glass can be improved and the specific gravity can be reduced.
In the optical glass of the present embodiment, TiO 2 、Nb 2 O 5 、WO 3 、ZrO 2 、Ta 2 O 5 、Bi 2 O 3 In total relative to SiO 2 、B 2 O 3 The mass ratio of the total content of [ (TiO ] 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 )/(SiO 2 +B 2 O 3 )]The upper limit of (b) is preferably 0.65, and more preferably 0.60, 0.55, and 0.50. Further, mass ratio [ (TiO) 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 )/(SiO 2 +B 2 O 3 )]The lower limit of (b) is preferably 0.25, and more preferably 0.30, 0.35, and 0.40 in this order. By mixing the mass ratio of [ (TiO) 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 )/(SiO 2 +B 2 O 3 )]The above range allows obtaining desired optical constants.
In the optical glass of the present embodiment, TiO 2 、Nb 2 O 5 、WO 3 、ZrO 2 、Ta 2 O 5 、Bi 2 O 3 、La 2 O 3 、Gd 2 O 3 、Y 2 O 3 In total relative to SiO 2 、B 2 O 3 The mass ratio of the total content of [ (TiO ] 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 +La 2 O 3 +Gd 2 O 3 +Y 2 O 3 )/(SiO 2 +B 2 O 3 )]The upper limit of (2) is preferably 2.4, and more preferably 2.3, 2.2 and 2.1. Further, mass ratio [ (TiO) 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 +La 2 O 3 +Gd 2 O 3 +Y 2 O 3 )/(SiO 2 +B 2 O 3 )]The lower limit of (b) is preferably 1.6, and more preferably 1.7, 1.8 and 1.9 in this order. In addition, by mixing the mass ratio [ (TiO ] 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 +La 2 O 3 +Gd 2 O 3 +Y 2 O 3 )/(SiO 2 +B 2 O 3 )]The above range allows obtaining desired optical constants.
In the optical glass of the present embodiment, Li 2 The upper limit of the content of O is preferably 5%, and more preferably 3%, 2%, and 1% in this order. Li 2 The lower limit of the content of O is preferably 0%. Li 2 The content of O may be 0%.
In the optical glass of the present embodiment, Na 2 The upper limit of the content of O is preferably 5%, and more preferably 3%, 2%, and 1% in this order. Na (Na) 2 The lower limit of the content of O is preferably 0%. Na (Na) 2 The content of O may be 0%.
In the optical glass of the present embodiment, K 2 The upper limit of the content of O is preferably 5%, and more preferably 3%, 2%, and 1% in this order. K 2 The lower limit of the content of O is preferably 0%. K 2 The content of O may be 0%.
In the optical glass of the present embodiment, Li 2 O、Na 2 O and K 2 Total content of O [ Li 2 O+Na 2 O+K 2 O]The upper limit of (b) is preferably 5%, and more preferably 4%, 3%, and 2%. Total content [ Li 2 O+Na 2 O+K 2 O]The lower limit of the content of (b) is preferably 0%. Total content [ Li 2 O+Na 2 O+K 2 O]May be 0%.
Li 2 O、Na 2 O and K 2 O has the functions of lowering the liquidus temperature and improving the thermal stability of the glass, and when their content is excessive, chemical durability and weather resistanceWill drop. Thus, Li 2 O、Na 2 O and K 2 The respective contents of O and the total content thereof are preferably in the above ranges.
In the optical glass of the present embodiment, Cs 2 The upper limit of the content of O is preferably 5%, and more preferably 3%, 1%, and 0.5% in this order. Cs 2 The lower limit of the content of O is preferably 0%.
Cs 2 O has a function of improving thermal stability of glass, and when their content is excessive, chemical durability and weather resistance may be reduced. Thus, Cs 2 The content of O is preferably in the above range.
In the optical glass of the present embodiment, the upper limit of the content of MgO is preferably 10%, and more preferably 7%, 4%, and 2% in this order. The lower limit of the content of MgO is preferably 0%. The MgO content may be 0%.
In the optical glass of the present embodiment, the upper limit of the SrO content is preferably 10%, and more preferably 7%, 4%, and 2% in this order. The lower limit of the SrO content is preferably 0%. The SrO content may be 0%.
In the optical glass of the present embodiment, the upper limit of the content of BaO is preferably 10%, and more preferably 5%, 2%, and 1% in this order. The lower limit of the content of BaO is preferably 0%. The content of BaO may be 0%.
Any of MgO, SrO, and BaO is a glass component having a function of improving thermal stability and devitrification resistance of the glass. However, when the content of these glass components is too large, the specific gravity increases, the high dispersion property deteriorates, and the thermal stability and devitrification resistance of the glass decrease. Therefore, the content of each of these glass components is preferably within the above range.
In the optical glass of the present embodiment, the upper limit of the total content [ MgO + CaO + SrO + BaO ] of MgO, CaO, SrO and BaO is preferably 10%, and more preferably 7%, 4% and 2% in this order. The lower limit of the total content [ MgO + CaO + SrO + BaO ] is preferably 0%. The total content [ MgO + CaO + SrO + BaO ] may be 0%.
By setting the total content [ MgO + CaO + SrO + BaO ] in the above range, chemical durability and thermal stability can be maintained without hindering high dispersion.
In the optical glass of the present embodiment, Sc 2 O 3 The content of (b) is preferably 2% or less. Further, Sc 2 O 3 The lower limit of the content of (b) is preferably 0%.
In the optical glass of the present embodiment, HfO 2 The content of (b) is preferably 2% or less. Further, HfO 2 The lower limit of the content of (b) is preferably 0%, more preferably 0.05% and 0.1%.
Sc 2 O 3 、HfO 2 Has the function of improving the high dispersion of glass, but is an expensive component. Thus, Sc 2 O 3 、HfO 2 The respective contents are preferably in the above ranges.
In the optical glass of the present embodiment, Lu 2 O 3 The content of (b) is preferably 2% or less. Furthermore, Lu 2 O 3 The lower limit of the content of (b) is preferably 0%.
Lu 2 O 3 The glass has a function of improving the high dispersion property of glass, but is a glass component that increases the specific gravity of glass due to its large molecular weight. Thus, Lu 2 O 3 The content of (b) is preferably in the above range.
In the optical glass of the present embodiment, GeO 2 The content of (b) is preferably 2% or less. Furthermore, GeO 2 The lower limit of the content of (b) is preferably 0%.
GeO 2 The glass has a function of improving the high dispersion property of glass, but is an extremely expensive component among glass components generally used. Therefore, GeO is a useful material for reducing the production cost of glass 2 The content of (b) is preferably in the above range.
In the optical glass of the present embodiment, Yb 2 O 3 The content of (b) is preferably 2% or less. In addition, Yb 2 O 3 The lower limit of the content of (b) is preferably 0%.
When Yb 2 O 3 When the content of (A) is too large, the specific gravity of the glass increases and the glass is thermally stableThe risk of decline. Thus, Yb 2 O 3 The content of (b) is preferably in the above range.
The optical glass of the present embodiment preferably mainly contains the above-mentioned glass component, i.e., B as an essential component 2 O 3 、La 2 O 3 、ZnO、SiO 2 、TiO 2 And ZrO 2 And further Gd as an optional component 2 O 3 、CaO、Ta 2 O 5 、Y 2 O 3 、P 2 O 5 、Al 2 O 3 、Nb 2 O 5 、WO 3 、Bi 2 O 3 、Li 2 O、Na 2 O、K 2 O、Cs 2 O、MgO、SrO、BaO、Sc 2 O 3 、HfO 2 、Lu 2 O 3 、GeO 2 And Yb 2 O 3 The total content of the glass components is preferably more than 95%, more preferably more than 98%, still more preferably more than 99%, and still more preferably more than 99.5%.
The optical glass of the present embodiment is preferably substantially composed of the above glass components, but may contain other components within a range not interfering with the action and effect of the present invention. In the present invention, the inclusion of inevitable impurities is not excluded.
(other Components)
In addition to the above components, the above optical glass may contain a small amount of Sb 2 O 3 、CeO 2 And the like as clarifying agents. The total amount (added amount) of the clarifying agent is 0% or more, preferably less than 1%, more preferably 0% or more and 0.5% or less.
The added amount of the refining agent is an amount of the refining agent represented by weight percentage, assuming that the total content of all glass components except the refining agent is 100%.
Pb, Cd, As, Th, etc. are components that may cause a burden on the environment. Thus, PbO, CdO, ThO 2 The content of each is preferably 0 to 0.1%, more preferably 0 to 0.05%, still more preferably 0 to 0.01%, and particularly preferably substantially no PbO, CdO, ThO 2 。
As 2 O 3 The content of (B) is preferably 0 to 0.1%, more preferably 0 to 0.05%, still more preferably 0 to 0.01%, and particularly preferably substantially no As 2 O 3 。
Further, the optical glass can obtain a high transmittance over a wide range of the entire visible light region. In order to utilize such a characteristic, it is preferable that the coloring element is not contained. Examples of the coloring element include Cu, Co, Ni, Fe, Cr, Eu, Nd, Er, and V. Any element is preferably less than 100 mass ppm, more preferably 0 to 80 mass ppm, further preferably 0 to 50 mass ppm, and particularly preferably substantially not contained.
Further, Ga, Te, Tb, and the like are components that do not need to be introduced, and are also expensive components. Therefore, Ga in mass% 2 O 3 、TeO 2 、TbO 2 The content ranges of each are preferably 0 to 0.1%, more preferably 0 to 0.05%, still more preferably 0 to 0.01%, still more preferably 0 to 0.005%, still more preferably 0 to 0.001%, and particularly preferably substantially none.
(glass characteristics)
< Abbe number ν d >
In the optical glass of the present embodiment, Abbe number ν d is 35 to 39. The Abbe number vd can be set to 36 to 38.5 or 37 to 38. Nb is a component for lowering Abbe number vd relatively 2 O 5 、TiO 2 、ZrO 2 、Ta 2 O 5 、WO 3 . The component for relatively increasing Abbe number vd is SiO 2 、B 2 O 3 、Li 2 O、Na 2 O、K 2 O、La 2 O 3 BaO, CaO, SrO. The abbe number ν d can be controlled by appropriately adjusting the contents of these components.
< refractive index nd >
In the optical glass of the present embodiment, the refractive index nd is preferably 1.80 to 1.86. The refractive index nd can be set to 1.81-1.85 or 1.82-1.84. Nb is a component capable of relatively increasing the refractive index nd 2 O 5 、TiO 2 、ZrO 2 、Ta 2 O 5 、WO 3 、La 2 O 3 . The component capable of relatively lowering the refractive index nd is SiO 2 、B 2 O 3 、Li 2 O、Na 2 O、K 2 And O. By appropriately adjusting the contents of these components, the refractive index nd can be controlled.
< specific gravity of glass >
The specific gravity of the optical glass of the present embodiment is preferably 5.0 or less, and more preferably 4.7 or less, 4.6 or less, and 4.55 or less in this order. The lower specific gravity is more preferable, and the lower limit is not particularly limited, but is usually about 4.3. Relatively, the components with high specific gravity are BaO and La 2 O 3 、ZrO 2 、Nb 2 O 5 、Ta 2 O 5 And the like. Relatively speaking, the component with low specific gravity is SiO 2 、B 2 O 3 、Li 2 O、Na 2 O、K 2 O, and the like. By adjusting the contents of these components, the specific gravity can be controlled.
(production of optical glass)
The optical glass of the present embodiment may be produced by blending glass raw materials to the above-mentioned predetermined composition and producing the glass raw materials by a known glass production method. For example, a plurality of compounds are prepared, mixed well to prepare a batch raw material, and the batch raw material is put into a quartz crucible or a platinum crucible and subjected to a coarse melting (Rough melt). The melt obtained by the coarse melting is quenched and pulverized to prepare cullet. The cullet was placed in a platinum crucible and heated and remelted (Remelt) to obtain molten glass, and the molten glass was further clarified and homogenized, and then molded and slowly cooled to obtain optical glass. The molten glass can be formed and gradually cooled by a known method.
The compound used in the preparation of the batch raw material is not particularly limited as long as the desired glass component can be introduced into the glass in a desired content, and examples of such a compound include oxides, carbonates, nitrates, hydroxides, and fluorides.
(production of optical element, etc.)
When an optical element is produced using the optical glass of the present embodiment, a known method can be applied. For example, in the production of the above optical glass, a molten glass is poured into a mold and molded into a plate shape to produce a glass material including the optical glass of the present invention. The obtained glass material is appropriately cut, ground and polished to prepare cut pieces having a size and a shape suitable for press molding. The cut pieces are heated and softened, and are press-molded (reheat press-molded) by a known method to produce an optical element blank having a shape similar to that of the optical element. The optical element blank is annealed, and ground and polished by a known method to produce an optical element.
An antireflection film, a total reflection film, or the like may be coated on the optically functional surface of the produced optical element according to the purpose of use.
According to one embodiment of the present invention, an optical element including the above optical glass can be provided. Examples of the type of the optical element include: lenses such as spherical lenses and aspherical lenses; a prism; diffraction gratings, and the like. Examples of the shape of the lens include: various shapes such as a biconvex lens, a plano-convex lens, a biconcave lens, a plano-concave lens, a convex-mirror concave-convex lens, and a concave-mirror concave-convex lens. The optical element can be produced by a method including a step of processing a glass molded body including the optical glass. Examples of the processing include: cutting, rough grinding, finish grinding, polishing, and the like. When such processing is performed, the use of the glass can reduce breakage, and can stably supply high-quality optical elements.
Examples
The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the embodiment shown in the examples.
(example 1)
Glass samples having glass compositions shown in tables 1 and 2 were produced by the following procedures, and various evaluations were performed.
[ production of optical glass ]
First, oxides, hydroxides, carbonates, and nitrates corresponding to the constituent components of the glass were prepared as raw materials, and the raw materials were weighed and blended so that the glass compositions of the obtained optical glasses would be the compositions shown in tables 1 and 2, and the raw materials were sufficiently mixed. The prepared raw material (batch raw material) thus obtained is put into a platinum crucible, heated at 1050 to 1400 ℃ for 2 to 5 hours to produce molten glass, homogenized by stirring, clarified, and then cast into a mold preheated to an appropriate temperature. The cast glass is heat-treated at any temperature from 100 ℃ lower than the glass transition temperature Tg (Tg-100 ℃) to 30 ℃ higher than Tg (Tg +30 ℃) for 30 to 120 minutes, and then cooled to room temperature in a furnace, thereby obtaining a glass sample.
[ confirmation of glass component composition ]
The contents of the respective glass components in the obtained glass samples were measured by inductively coupled plasma atomic emission spectrometry (ICP-AES) and confirmed to be compositions shown in tables 1 and 2.
[ measurement of optical Properties ]
The obtained glass sample was further annealed at around the glass transition temperature Tg for about 30 minutes to about 2 hours, and then cooled to room temperature in a furnace at a cooling rate of-30 ℃/hour to obtain an annealed sample. The obtained annealed sample was measured for refractive indices nd, ng, nF and nC, Abbe number vd, and specific gravity. The results are shown in Table 2.
(i) Refractive indices nd, ng, nF, nC and Abbe number vd
The refractive indices nd, ng, nF and nC of the above annealed samples were measured by a refractive index measuring method according to JIS B7071-1, and Abbe number ν d was calculated based on the following formula.
νd＝(nd-1)/(nF-nC)
(ii) Specific gravity of
Specific gravity was measured by the archimedes method.
[ Table 1]
Figure BDA0002025979940000141
[ Table 2]
Figure BDA0002025979940000151
(example 2)
Using each of the optical glasses produced in example 1, a lens blank was produced by a known method, and various lenses were produced by processing the lens blank by a known method such as polishing.
The optical lens to be produced is any of various lenses such as a biconvex lens, a biconcave lens, a plano-convex lens, a plano-concave lens, a concave-convex lens, and a convex-concave lens.
The various lenses can correct the second-order chromatic aberration well by combining with lenses including other kinds of optical glasses.
Further, since glass has a low specific gravity, each lens has a smaller weight than a lens having the same optical characteristics and size, and is preferably used as various image pickup apparatuses, particularly as an image pickup apparatus of an autofocus type for the reason of energy saving or the like. In the same manner, prisms were produced using the various optical glasses produced in example 1.
The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description above, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.
For example, the optical glass according to one embodiment of the present invention can be produced by adjusting the composition of the glass composition exemplified above as described in the specification.
It is to be understood that 2 or more items described as examples or preferred ranges in the specification can be arbitrarily combined.

Claims (2)

1. A kind of optical glass is disclosed, which has a transparent glass body,
the Abbe number vd is 35-39,
B 2 O 3 the content of (B) is 12 to 26 mass%,
La 2 O 3 the content of (B) is 29 to 46% by mass,
the content of ZnO is 18 to 28 mass%,
SiO 2 the content of (B) is more than 0 mass% and 10 mass% or less,
TiO 2 is 5.75 mass% or more and 12 mass% or less,
ZrO 2 the content of (B) is more than 0 mass% and 4.85 mass% or less,
Gd 2 O 3 the content of (B) is 0 to 5% by mass,
the content of CaO is 0 to 12 mass%,
Ta 2 O 5 the content of (B) is 0 to 0.5 mass%,
Y 2 O 3 the content of (B) is 0 to 5% by mass,
Li 2 the content of O is 0 to 1 mass%,
Nb 2 O 5 and WO 3 Total content of [ Nb ] 2 O 5 +WO 3 ]Is 0 mass percent of the total amount of the components,
TiO 2 、Nb 2 O 5 and WO 3 In total amount based on TiO 2 (ii) mass ratio of contents of [ (TiO) 2 +Nb 2 O 5 +WO 3 )/TiO 2 ]The number of the carbon atoms is 1,
TiO 2 、Nb 2 O 5 、WO 3 、ZrO 2 、Ta 2 O 5 、Bi 2 O 3 、La 2 O 3 、Gd 2 O 3 、Y 2 O 3 relative to the total content of SiO 2 、B 2 O 3 The mass ratio of the total content of [ (TiO ] 2 +Nb 2 O 5 +WO 3 +ZrO 2 +Ta 2 O 5 +Bi 2 O 3 +La 2 O 3 +Gd 2 O 3 +Y 2 O 3 )/(SiO 2 +B 2 O 3 )]Is 1.7 or more and 2.4 or less.
2. An optical element comprising the optical glass according to claim 1.
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