CN109415239A

CN109415239A - Optical glass, preform and optical module

Info

Publication number: CN109415239A
Application number: CN201780040277.9A
Authority: CN
Inventors: 桃野净行
Original assignee: Ohara Inc
Current assignee: Ohara Inc
Priority date: 2016-06-29
Filing date: 2017-06-26
Publication date: 2019-03-01
Anticipated expiration: 2037-06-26
Also published as: TW201815705A; WO2018003720A1; TWI731991B; CN109415239B; JP7126446B2; JPWO2018003720A1

Abstract

The invention discloses a kind of optical characteristics with the low dispersion of middle refractive index, and the optical glass with good chemical durability and small specific gravity and preform and optical module using the optical glass.Optical glass is in terms of mole %: mole and (SiO₂+B₂O₃) it is 40.0~75.0%；Ln₂O₃Ingredient (in formula, Ln for selected from La, Gd, Y, Lu at one or more of group) mole and be 3.0%~25.0%；Rn₂O ingredient is (in formula, Rn for selected from Li, Na, K at one or more of group) mole and for greater than 0%~25.0% or less, multiplying d × RA value of specific gravity of glass (d) and powder method acid resistance grade (RA) is 15.0 hereinafter, having 1.58 or more 1.80 refractive index (n below_d), and there are 35 or more 65 Abbe number (ν below_d)。

Description

Optical glass, preform and optical module

Technical field

The present invention relates to a kind of optical glass, preform and optical modules.

Background technique

In recent years, using the digitlization of the machine of optical system and High precision just in high speed development, in digital camera or The images such as the photography machines such as video camera, projector or projection TV play the various optical apparatus fields such as (projection) machine, reduce The quantity of the optical modules such as lens or prism used in optical system keeps optical system overall slimmer and more graceful and more small and exquisite demand It is increasingly enhanced.

Production optical module optical glass in, it is especially slimmer and more graceful, more small and exquisite to achievable optical system overall and Color difference corrects demand, has 1.60 or more refractive index (n_d) and there are 35 or more 65 or less Abbe number (ν_d) middle refractive index it is low The demand of dispersing glass increasingly increases.

As the low dispersing glass of this middle refractive index, it is well known as the glass using Patent Documents 1 to 2 as representative and forms Object.But these are by B₂O₃- La₂O₃The glass component that class is constituted is in the characteristic of usually used glass ingredient, mostly easily It is influenced by water or acid, durability is insufficient.Therefore, when carrying out the polishing of glass, it some times happens that glass deteriorates, sometimes It is led to the problem of in manufacturing process.

In addition, for demand in recent years gradually widened monitoring camera or vehicle-mounted camera etc., because often in room Outer use, so more being exposed in wind and rain or vapor in the atmosphere etc..Using made of traditional glass constituent pinches of picture group When part, from the point of view of can be premised on outdoor long-time service, the durability of the composition of glass documented by Patent Documents 1 to 2 be also insufficient With competent.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Application 55-080736 bulletin

Patent document 2: Japanese Unexamined Patent Publication 11-139844 bulletin

Summary of the invention

Problems to be solved by the invention

In view of the above problems, it is an object of the present invention to obtain the optical constant with above-mentioned prescribed limit, have good Chemical durability and small specific gravity optical glass.

The solution to the problem

Present inventors etc. have been repeated to solve the above subject and have goed deep into experimental study, as a result, it has been found that, it can be by having Specific composition is finally completed the present invention come the glass of the above subject that achieves a solution.Specifically, the present invention provides following technical side Case.

(1) a kind of optical glass,

In terms of mole %,

Mole and (SiO₂+B₂O₃) it is 40.0~75.0%；

Ln₂O₃Ingredient (in formula, Ln for selected from La, Gd, Y, Lu at one or more of group) mole and be 3.0%~ 25.0%；

Rn₂O ingredient (in formula, Rn for selected from Li, Na, K at one or more of group) mole and for greater than 0%~ 25.0% or less；

Multiplying d × RA value of specific gravity of glass (d) and powder method acid resistance grade (RA) is 15.0 hereinafter, the optics Glass has 1.58 or more 1.80 refractive index (n below_d), and there are 35 or more 65 Abbe number (ν below_d)。

(2) optical glass according to (1), wherein

In terms of mole %,

SiO₂Ingredient 5.0~60.0%

B₂O₃Ingredient 0~70.0%

Al₂O₃Ingredient 0~25.0%,

La₂O₃Ingredient 0~25.0%,

Y₂O₃Ingredient 0~25.0%,

Gd₂O₃Ingredient 0~25.0%,

Lu₂O₃Ingredient 0~5.0%,

Yb₂O₃Ingredient 0~5.0%,

ZrO₂Ingredient 0~10.0%,

TiO₂Ingredient 0~10.0%,

Nb₂O₅Ingredient 0~10.0%,

Ta₂O₅Ingredient 0~5.0%,

WO₃Ingredient 0~5.0%,

ZnO component 0~30.0%,

MgO ingredient 0~30.0%,

CaO ingredient 0~35.0%,

SrO ingredient 0~30.0%,

BaO ingredient 0~30.0%,

Li₂O ingredient 0~20.0%,

Na₂O ingredient 0~15.0%,

K₂O ingredient 0~15.0%,

GeO₂Ingredient 0~10.0%,

Ga₂O₃Ingredient 0~10.0%,

P₂O₅Ingredient 0~10.0%,

Bi₂O₃Ingredient 0~5.0%,

TeO₂Ingredient 0~5.0%,

SnO₂Ingredient 0~3.0%,

Sb₂O₃Ingredient 0~1.0%.

(3) optical glass according to any one of (1) or (2), wherein molar ratio (SiO2+Al2O3)/B2O3 is 0.1 or more.

(4) optical glass according to (1) to (3), wherein mole and (SiO2+Al2O3) be 8.0~65.0%.

(5) optical glass according to any one of (1) to (4), wherein molar ratio (Ln₂O₃/Rn₂O) for 0.3 with On.

(6) optical glass according to any one of (1) to (5), wherein mole and (ZrO₂+TiO₂+Nb₂O₅+Ta₂O₅ +WO₃+Bi₂O₃+TeO₂) it is 0~20.0%.

(7) optical glass according to any one of (1)~(6), wherein molar ratio (Ln₂O₃+SiO₂+Al₂O₃)/(RO +Rn₂O+B₂O₃) it is 0.2~3.0.

(8) optical glass according to any one of (1)~(7), wherein mole product (BaO × Gd₂O₃) be lower than 5.0%.

(9) optical glass according to any one of (1)~(8), wherein the chemical durability of powder method measurement is (resistance to It is acid) there are 1 grade~4 grades.

(10) optical glass according to any one of (1)~(9), wherein RO ingredient (in formula, R be selected from Zn, Mg, Ca, Sr, Ba at one or more of group) mole and be 40.0% or less.

(11) a kind of preform is made of the optical glass of any one of (1)~(10).

(12) a kind of optical module is made of the optical glass of any one of (1)~(10).

(13) a kind of optical apparatus has optical module described in (12).

By means of the invention it is possible to obtain the glass with optical constant and good chemical durability in prescribed limit.

Specific embodiment

Hereinafter, by the embodiment of glass of the invention is described in detail, but the present invention is not by following implementation Any restrictions, within the scope of the purpose of the present invention, the present invention can be subject to it is appropriate change and implement.In addition, for The part of repeated explanation will do it appropriate omission sometimes, but it is not intended to limit purport of the invention.

[glass ingredient]

The compositing range for constituting each ingredient of optical glass of the invention will be illustrated below.In the present specification, respectively The amount of ingredient forms mole % of opposite glass overall material with oxide conversion when being not particularly illustrated come table Show.Here " oxide conversion composition ", it is the oxide used in the raw material as glass constituent of the present invention, compound It is opposite with all oxides conversion composition in the case that salt, metal fluoride etc. all decompose in melting and become oxide Mole % of full molal quantity is indicated.

Mole and (SiO₂+B₂O₃) be 40.0% or more when, be easy to get improve devitrification resistance effect.

In this way, (SiO₂+B₂O₃) mole sum lower limit preferably 40.0%, more preferable 45.0%, further preferably 50.0%.

On the other hand, by making this mole and 75.0% hereinafter, the meltbility of glass raw material can be inhibited to deteriorate and glue The excessive rising of property.Therefore, (SiO₂+B₂O₃) mole and it is the upper limit preferably 75.0%, more preferable 70.0%, further preferably 65.0%.

Ln₂O₃Ingredient (in formula, Ln for selected from La, Gd, Y, Lu at one or more of group) amount and (mole With) it is preferably 3.0% or more 25.0% or less.

In particular, by making this and 3.0% or more, improving the refractive index and Abbe number of glass, thus, it is possible to easily Obtain the glass with required refractive index and Abbe number.Therefore, Ln₂O₃Ingredient mole and lower limit preferably 3.0%, more preferably 6.0%, further preferred 8.0%, most preferably 10%.

On the other hand, by making this and 25.0% hereinafter, the liquidus temperature of glass reduces, it is possible thereby to reduce glass Devitrification.Therefore, Ln₂O₃Ingredient mole and the upper limit preferably 25.0%, more preferable 20.0%, further preferred 18.0%.

Rn₂O ingredient (in formula, Rn for selected from Li, Na, K at one or more of group) amount and (mole and) it is excellent It is selected as 25.0% or less.Chemical durability deteriorates caused by being can inhibit as a result, because of excessive contain.Therefore above-mentioned overall to contain Measure the upper limit preferably 25.0%, it is more preferable 20.0%, further preferred 15.0%, still more preferably 10.0%, it is further excellent Select 5.0%, most preferably 3.0%.

On the other hand, by should and be set as being greater than 0%, meltbility deterioration and the excessive rising of viscosity be can inhibit.Therefore, Rn₂O ingredient mole and lower limit be preferably greater than 0%, more preferable 0.5%, further preferred 1.0%.

SiO₂Ingredient is the essential component for improving devitrification resistance or chemical durability.SiO₂The amount lower limit of ingredient is preferred 5.0%, more preferable 10.0%, further preferred 15.0%.

On the other hand, by making SiO₂The amount of ingredient 60.0% hereinafter, bigger refractive index can be obtained easily, Inhibit the deterioration of meltbility and the excessive rising of viscosity.Therefore, SiO₂It is the amount upper limit preferably 60.0% or less of ingredient, more excellent Select 50.0%, further preferred 40.0%, still more preferably 30.0%, most preferably 20.0%.

SiO₂SiO can be used in ingredient₂、K₂SiF₆、Na₂SiF₆Deng as raw material.

B₂O₃Ingredient is that can effectively improve meltbility, improves any ingredient of devitrification resistance.B₂O₃The amount lower limit of ingredient Preferably greater than 0%, more preferable 5.0%, further preferred 10.0%, still more preferably 15.0%, further preferably 20.0%, again into One step preferably 30.0%, most preferably 40.0%.

On the other hand, by making B₂O₃The amount of ingredient is 70.0% hereinafter, can inhibit the bad of glass chemistry durability Change.Therefore, B₂O₃It is the amount upper limit preferably 70.0% of ingredient, more preferable 60.0%, further preferred 55.0%, most preferably 50.0%.

B₂O₃H can be used in ingredient₃BO₃、Na₂B₄O₇、Na₂B₄O₇·10H₂O、BPO₄Deng as raw material.

Al₂O₃Ingredient is any ingredient that can effectively improve devitrification resistance or chemical durability.Al₂O₃The amount of ingredient Lower limit is preferably greater than 0%, more preferable 0.5%, further preferred 1.0%.

In particular, by making Al₂O₃The amount of ingredient is largely containing Rn 5.0% or more₂In the case where O ingredient, Chemical durability can be improved significantly.Therefore, Al₂O₃It is the amount lower limit preferably 5.0% of ingredient, more preferable 10.0%, optimal Select 15.0%.

On the other hand, by making Al₂O₃The amount of ingredient is below 25.0%, it is suppressed that caused by excessive contain Devitrification resistance deterioration and refractive index reduce.Therefore, Al₂O₃It is the amount upper limit preferably 25.0% of ingredient, more preferable 20.0%, most It is preferred that 18.0%.

Al₂O₃Al can be used in ingredient₂O₃、Al(OH)₃、AlF₃、Al(PO₃)₃Deng as raw material.

La₂O₃Ingredient is to improve glass refraction, and improve any ingredient of glass Abbe number.Therefore, La₂O₃Ingredient Amount lower limit is preferably greater than 0%, more preferable 1.0%, it is further preferred 3.0%, still more preferably 5.0%, most preferably 8.0%.

On the other hand, by making La₂O₃The amount of ingredient is 25.0% hereinafter, improving the stability of glass to drop Low devitrification.Therefore, La₂O₃It is the amount upper limit preferably 25.0% of ingredient, more preferable 20.0%, further preferred 15.0%, optimal Select 12.0%.

La₂O₃La can be used in ingredient₂O₃、La(NO₃)₃·XH₂O (X is arbitrary integer) etc. is used as raw material.

Y₂O₃Ingredient is, in the case where amount is greater than 0%, while maintaining high refractive index and high Abbe number, reduces The material cost of glass, and any ingredient of specific gravity of glass can be further decreased compared to other rare earth constituents.Therefore, Y₂O₃At The amount lower limit divided is preferably greater than 0%, more preferable 1.0%, further preferred 2.5%, most preferably 3.5%.

On the other hand, by making Y₂O₃The amount of ingredient is 25.0% hereinafter, the devitrification resistance of glass can be improved.Therefore, Y₂O₃It is the amount upper limit preferably 25.0% of ingredient, more preferable 20.0%, further preferred 15.0%, still more preferably 10.0%, most preferably 5.0%.

Y₂O₃Y can be used in ingredient₂O₃、YF₃Deng as raw material.

Gd₂O₃Ingredient is, in the case where amount is greater than 0%, can be improved glass refractive index and Abbe number it is any at Point.

On the other hand, by making the Gd in rare earth element also costly₂O₃Ingredient is 25.0% hereinafter, inhibiting specific gravity Increase, the material cost of glass can be reduced, be achieved at a low price production optical glass.Therefore, Gd₂O₃On the amount of ingredient Limit preferably 25.0%, it is more preferable 20.0%, further preferred 15.0%, still more preferably 10.0%, further preferably 5.0%, most It is preferred that 1.0%.From the viewpoint of control material cost and inhibiting specific gravity increase, Gd can also be free of₂O₃Ingredient.

Gd₂O₃Gd can be used in ingredient₂O₃、GdF₃Deng as raw material.

Lu₂O₃Ingredient is, in the case where amount is greater than 0%, can be improved glass refraction and Abbe number it is any at Point.

On the other hand, by making Lu₂O₃The amount of ingredient respectively 5.0% hereinafter, reduce the material cost of glass, It therefore, can more qurer production optical glass.Thus the devitrification resistance of glass also can be improved.Therefore, Lu₂O₃Ingredient contains Measure the upper limit preferably 5.0%, more preferable 3.0%, further preferred 1.0%, most preferably 0.1%.From the viewpoint for reducing material cost It sets out, Lu can also be free of₂O₃Ingredient.

Lu₂O₃Lu can be used in ingredient₂O₃Deng as raw material.

Yb₂O₃Ingredient is, in the case where amount is greater than 0%, can be improved glass refraction and Abbe number it is any at Point.

On the other hand, by making Yb₂O₃The amount of ingredient 5.0% hereinafter, reduce the material cost of glass, therefore, It can more qurer production optical glass.Thus the devitrification resistance of glass also can be improved.Therefore, Yb₂O₃The amount upper limit of ingredient It is preferred that 5.0%, more preferable 3.0%, further preferred 1.0%, most preferably 0.1%.From the viewpoint of reducing material cost, Yb can be free of₂O₃Ingredient.

Yb₂O₃Yb can be used in ingredient₂O₃Deng as raw material.

ZrO₂Ingredient is that, in the case where amount is greater than 0%, glass refraction and Abbe number can be improved, and can be improved Any ingredient of devitrification resistance.

On the other hand, by making ZrO₂The amount of ingredient is 10.0% hereinafter, can reduce because of ZrO₂The excess of ingredient contains Caused by devitrification.Therefore, ZrO₂The amount upper limit preferably 10.0% of ingredient, it is more preferable 5.0%, further preferred 3.0%, Most preferably 1.0%.

ZrO₂ZrO can be used in ingredient₂、ZrF₄Deng as raw material.

TiO₂Ingredient is that, in the case where amount is greater than 0%, any ingredient of glass refraction can be improved.

On the other hand, by making TiO₂The amount of ingredient is 10.0% hereinafter, can reduce because of TiO₂The excess of ingredient contains Caused by devitrification, and then inhibit reduction of the glass to the transmissivity of visible light (especially wavelength 500nm or less).Therefore, TiO₂The amount upper limit preferably 10.0% of ingredient, more preferable 5.0%, further preferred 3.0%, most preferably 1.0%.

Nb₂O₅Ingredient is that, in the case where amount is greater than 0%, any ingredient of glass refraction can be improved.

On the other hand, by making Nb₂O₅The amount of ingredient is 10.0% hereinafter, can reduce because of Nb₂O₅The excess of ingredient contains Devitrification caused by having, and then inhibit reduction of the glass to the transmissivity of visible light (especially wavelength 500nm or less).Therefore, Nb₂O₅The amount upper limit preferably 10.0% of ingredient, more preferable 5.0%, further preferred 3.0%, most preferably 1.0%.

Nb₂O₅Nb can be used in ingredient₂O₅Deng as raw material.

Ta₂O₅Ingredient is, in the case where amount is greater than 0%, glass refraction can be improved, improve appointing for devitrification resistance Meaning ingredient.

On the other hand, by making expensive Ta₂O₅Ingredient is 5.0% hereinafter, to reduce the material cost of glass, thus It can more qurer production optical glass.Therefore, Ta₂O₅The amount upper limit preferably 5.0% of ingredient, it is more preferable 3.0%, into one Step preferably 1.0%, most preferably 0.1%.From the viewpoint of reducing material cost, Ta can also be free of₂O₅Ingredient.

Ta₂O₅Ta can be used in ingredient₂O₅Deng as raw material.

WO₃Ingredient is, in the case where amount is greater than 0%, glass refraction can be improved, improve any of devitrification resistance Ingredient.

On the other hand, by making WO₃The amount of ingredient is 5.0% hereinafter, reducing because of WO₃Glass caused by ingredient Color improves transmission of visible light.Therefore, WO₃It is the amount upper limit preferably 5.0% of ingredient, more preferable 3.0%, further excellent Select 1.0%.

WO₃WO can be used in ingredient₃Deng as raw material.

ZnO component is that, in the case where amount is greater than 0%, any ingredient of low-temperature melting properties can be improved.

On the other hand, by making the amount of ZnO component below 30.0%, it is suppressed that because caused by excessive contain Ah Shellfish number reduces and devitrification resistance reduces.Therefore, the amount upper limit preferably 30.0% of ZnO component, more preferable 20.0%, further It is preferred that 15.0%, still more preferably 10.0%, further preferably 5.0%, still further preferably 3.0%, most preferably 1.0%.

ZnO, ZnF can be used in ZnO component₂Deng as raw material.

MgO ingredient is that, in the case where amount is greater than 0%, any ingredient of low-temperature melting properties can be improved.

On the other hand, by making the amount of MgO ingredient 30.0% hereinafter, can inhibit because the excess of MgO ingredient contains Caused by chemical durability deterioration and devitrification resistance reduce.Therefore, the amount upper limit preferably 30.0% of MgO ingredient, more excellent Select 20.0%, further preferred 10.0%, still more preferably 5.0%, still further preferably 3.0%, most preferably 1.0%.

MgCO can be used in MgO ingredient₃、MgF₂Deng as raw material.

CaO ingredient is that in the case where amount is greater than 0%, can obtain raising low-temperature melting properties easily, inhibit viscosity The effect excessively risen.Therefore, the amount lower limit of CaO ingredient is preferably greater than 0%, and more preferable 0.5%, further preferably 1.0%.In particular, working as Al₂O₃When ingredient amount is less than 5.0%, devitrification resistance is insufficient, therefore, by making under CaO ingredient Limit can improve devitrification resistance 2.0% or more.Therefore, CaO ingredient lower limit preferably 2.0%, more preferable 3.0%, further excellent Select 5.0%.

On the other hand, by making the amount of CaO ingredient 35.0% hereinafter, can inhibit because the excess of CaO ingredient contains Caused by chemical durability deterioration and devitrification resistance reduce.Therefore, the amount upper limit preferably 35.0% of CaO ingredient, more excellent Select 25.0%, further preferred 15.0%, still more preferably 10.0%, still further preferably 5.0%.

CaCO can be used in CaO ingredient₃、CaF₂Deng as raw material.

SrO ingredient is that in the case where amount is greater than 0%, can obtain raising low-temperature melting properties easily, inhibit viscosity The effect excessively risen.Therefore, the amount lower limit of SrO ingredient is preferably greater than 0%, is more preferable 0.5%, further preferably 1.0%.

In particular, in Al₂O₃In the case that ingredient amount is less than 8.0%, devitrification resistance is insufficient, therefore, by making SrO The lower limit of ingredient can improve devitrification resistance 2.0% or more.Therefore, the ingredient lower limit preferably 2.0% of SrO, it is more preferable 3.0%, Further preferred 5.0%.

On the other hand, by making the amount of SrO ingredient 30.0% hereinafter, can inhibit because the excess of SrO ingredient contains Caused by chemical durability deterioration and devitrification resistance reduce.Therefore, the amount upper limit preferably 30.0% of SrO ingredient, more excellent Select 20.0%, further preferred 10.0%, still more preferably 5.0%.

Sr (NO can be used in SrO ingredient₃)₂、SrF₂Deng as raw material.

BaO ingredient is that in the case where amount is greater than 0%, can obtain easily and improve low temperature fusibility, inhibit viscosity The effect excessively risen.Therefore, the amount lower limit of BaO ingredient is preferably greater than 0%, and more preferable 0.5%, further preferably 1.0%.In particular, in Al₂O₃When ingredient amount is less than 8.0%, devitrification resistance is insufficient, therefore, by making under BaO ingredient Limit can improve devitrification resistance 2.0% or more.Therefore, the ingredient lower limit preferably 2.0% of BaO, more preferable 3.0%, further It is preferred that 5.0%.

On the other hand, by making the amount of BaO ingredient 30.0% hereinafter, can inhibit because the excess of BaO ingredient contains Caused by chemical durability deterioration and devitrification resistance reduce.Therefore, the amount upper limit preferably 30.0% of BaO ingredient, more excellent Select 20.0%, further preferred 10.0%, still more preferably 5.0%.

BaCO can be used in BaO ingredient₃、Ba(NO₃)₂、BaF₂Deng as raw material.

Li₂O ingredient is, in the case where amount is greater than 0%, any of low-temperature melting properties and forming of glass can be improved Ingredient.Therefore, Li₂The amount lower limit of O ingredient is preferably greater than 0%, more preferably greater than 0.1%, further preferred 0.5%.

On the other hand, by making Li₂The amount of O ingredient is 20.0% hereinafter, can inhibit because of Li₂The excess of O ingredient contains Caused by chemical durability deteriorate.Therefore, Li₂The amount upper limit preferably 20.0% of O ingredient, it is more preferable 15.0%, into one Step preferably 10.0%, still more preferably 5.0%, still further preferably 3.0%, most preferably 1.0%.

Li₂Li can be used in O ingredient₂CO₃、LiNO₃、Li₂CO₃Deng as raw material.

Na₂O ingredient is, in the case where amount is greater than 0%, any of low-temperature melting properties and forming of glass can be improved Ingredient.Therefore, Na₂The amount lower limit of O ingredient is preferably greater than 0%, more preferably greater than 0.1%, further preferred 0.5%.

On the other hand, by making Na₂The amount of O ingredient is 15.0% hereinafter, can inhibit because of Na₂The excess of O ingredient contains Caused by chemical durability deteriorate.Therefore, Na₂The amount upper limit preferably 15.0% of O ingredient, it is more preferable 10.0%, into one Step preferably 5.0%, still more preferably 3.0%, most preferably 1.0%.

Na₂Na can be used in O ingredient₂CO₃、NaNO₃、NaF、Na₂SiF₆Deng as raw material.

K₂O ingredient is, in the case where amount is greater than 0%, any of low-temperature melting properties and forming of glass can be improved Ingredient.Therefore, K₂The amount lower limit of O ingredient is preferably greater than 0%, more preferably greater than 0.1%, further preferred 0.5%.

On the other hand, by making K₂The amount of O ingredient is 15.0% hereinafter, can inhibit because of K₂The excess of O ingredient contain and Caused chemical durability deterioration.Therefore, K₂It is the amount upper limit preferably 15.0% of O ingredient, more preferable 10.0%, further excellent Select 5.0%, still more preferably 3.0%, most preferably 1.0%.

K₂K can be used in O ingredient₂CO₃、KNO₃、KF、KHF₂、K₂SiF₆Deng as raw material.

GeO₂Ingredient is, in the case where amount is greater than 0%, can be improved glass refraction and devitrification resistance it is any at Point.

However, due to GeO₂Cost of material it is higher, so its amount will increase production cost when higher.Therefore, GeO₂ The amount upper limit preferably 10.0% of ingredient, it is more preferable 5.0%, further preferred 3.0%, still more preferably 1.0%, again into One step preferably 0.1%.From the viewpoint of reducing material cost, GeO can also be free of₂Ingredient.

GeO₂GeO can be used in ingredient₂Deng as raw material.

Ga₂O₃Ingredient is, in the case where amount is greater than 0%, can be improved glass refraction and devitrification resistance it is any at Point.

However, due to Ga₂O₃Cost of material it is higher, so its amount will increase production cost when higher.Therefore, Ga₂O₃The amount upper limit preferably 10.0% of ingredient, it is more preferable 5.0%, further preferred 3.0%, still more preferably 1.0%, Still further preferably 0.1%.From the viewpoint of reducing material cost, Ga can also be free of₂O₃Ingredient.

Ga₂O₃Ga can be used in ingredient₂O₃Deng as raw material.

P₂O₅Ingredient is that, in the case where amount is greater than 0%, can reduce the liquidus temperature of glass, improve devitrification resistance Any ingredient.

On the other hand, by making P₂O₅The amount of ingredient 10.0% hereinafter, be able to suppress the chemical durability of glass, Especially it is able to suppress the reduction of water resistance.Therefore, P₂O₅The amount upper limit preferably 10.0% of ingredient, further preferably 5.0%, most preferably 1.0%.

P₂O₅Al (PO can be used in ingredient₃)₃、Ca(PO₃)₂、Ba(PO₃)₂、BPO₄、H₃PO₄Deng as raw material.

Bi₂O₃Ingredient is that, in the case where amount is greater than 0%, refractive index can be improved, reduce glass transition temperature Any ingredient.

On the other hand, by making Bi₂O₃The amount of ingredient hereinafter, can inhibit glass coloration, improves devitrification resistance 5.0% Property.Therefore, Bi₂O₃It is the amount upper limit preferably 5.0% of ingredient, more preferable 3.0%, further preferred 1.0%, most preferably 0.1%.

Bi₂O₃Bi can be used in ingredient₂O₃Deng as raw material.

TeO₂Ingredient is that, in the case where amount is greater than 0%, refractive index can be improved, reduce glass transition temperature Any ingredient.

On the other hand, TeO₂Glass is melted in platinum crucible or the fusion tank formed with melten glass joining part by platinum When glass raw material, there are problems that possibility and platinum generate alloying.Therefore, TeO₂It is the amount upper limit preferably 5.0% of ingredient, more excellent Select 3.0%, further preferred 1.0%, most preferably 0.1%.

TeO₂TeO can be used in ingredient₂Deng as raw material.

SnO₂Ingredient is that, in the case where amount is greater than 0%, can reduce the oxidation of melten glass and keep glass more clear It is clear, and any ingredient of the transmission of visible light of glass can be improved.

On the other hand, by making SnO₂The amount of ingredient is 3.0% hereinafter, can reduce melten glass causes because of reduction Glass coloration, glass devitrification.In addition, because reducing SnO₂The alloy of ingredient and melting equipment (noble metals such as especially Pt) Change the extension, it can be achieved that melting equipment service life.Therefore, SnO₂The amount upper limit preferably 3.0% of ingredient, more preferably 1.0%, further preferred 0.5%, most preferably 0.1%.

SnO₂SnO, SnO can be used in ingredient₂、SnF₂、SnF₄Deng as raw material.

Sb₂O₃Ingredient is that, in the case where amount is greater than 0%, can make any ingredient of melten glass deaeration.

On the other hand, if Sb₂O₃Amount is excessive, it is seen that the transmissivity in the light region long region of intermediate waves will be deteriorated.Therefore, Sb₂O₃The amount upper limit preferably 1.0% of ingredient, it is more preferable 0.7%, further preferred 0.5%, still more preferably 0.2%, Most preferably 0.1%.

Sb₂O₃Sb can be used in ingredient₂O₃、Sb₂O₅、Na₂H₂Sb₂O₇·5H₂O etc. is used as raw material.

In addition, the ingredient of glass clarifying, deaeration is not limited to above-mentioned Sb₂O₃Ingredient can also use in glass manufacturing area Well known clarifying agent, deaeration agent or their combination.

F ingredient is that in the case where amount is greater than 0%, glass Abbe number can be improved, reduce glass transition temperature, And any ingredient of devitrification resistance can be improved.

However, when F ingredient amount, i.e. with a part of the one kind or two or more oxide of above-mentioned each metallic element or After all being replaced, when becoming the total amount of the F of fluoride greater than 15.0%, because the volatile quantity of F ingredient increases, and it is difficult to obtain Obtain stable optical constant, it is difficult to obtain the glass of homogeneous.

Therefore, the amount upper limit preferably 15.0% of F ingredient, it is more preferable 12.0%, further preferred 10.0%, more into one Step preferably 5.0%, still further preferably 3.0%, most preferably 1.0%.

F ingredient is by using such as ZrF₄、AlF₃、NaF、CaF₂Deng be used as raw material, may be included in glass.

RO ingredient (in formula, R for selected from Zn, Mg, Ca, Sr, Ba at one or more of group) amount and (rub You and) be preferably 40.0% or less.Chemical durability deterioration or devitrification resistance drop caused by being can inhibit as a result, because of excessive contain It is low.Therefore, RO ingredient mole and it is the upper limit preferably 40.0%, more preferable 30.0%, further preferred 25.0%, further excellent Select 20.0%, still further preferably 15.0%, again still more preferably 10.0%, most preferably 5.0%.

On the other hand, by being larger than 0%, the meltbility for improving glass raw material can be obtained easily and inhibits sticky mistake Spend the effect risen.Therefore, RO ingredient mole and lower limit be preferably greater than 0%, more preferable 0.5%, further preferred 1.0%.

In particular, in Al₂O₃In the case that ingredient amount is less than 8.0%, devitrification resistance is insufficient, therefore, by make RO at Dividing lower limit is 2.0% or more, can improve devitrification resistance.The ingredient lower limit preferably 2.0%, more preferable 3.0% of RO as a result, into One step preferably 5.0%.

Molar ratio (SiO₂+Al₂O₃)/(B₂O₃) be 0.1 or more when, can obtain easily improve glass chemistry durability effect Fruit.Therefore, (SiO₂+Al₂O₃)/(B₂O₃) lower mole ratio limit preferably 0.1, more preferable 0.2, further preferred 0.3, further It is preferred that 0.4, most preferably 0.5.

On the other hand, by making the molar ratio 10.0 hereinafter, being able to suppress the deterioration and viscosity of glass raw material meltbility Excessive rising.Therefore, (SiO₂+Al₂O₃)/(B₂O₃) the molar ratio upper limit can also preferably 10.0, it is more preferable 8.0, further It is preferred that 6.0, still more preferably 4.0, still further preferably 3.0.

In addition, not containing B₂O₃When ingredient, by (SiO₂+Al₂O₃)/(B₂O₃) value is set as infinitely great.

Mole and (SiO₂+Al₂O₃) be 8.0% or more when, be easy to get improve glass chemistry durability effect.Therefore, (SiO₂+Al₂O₃) mole and it is lower limit preferably 8.0%, more preferable 10.0%, further preferred 15.0%, further preferably 20.0%, most preferably 25.0%.

On the other hand, by making this mole and 65.0% hereinafter, can inhibit the deterioration and viscosity of glass raw material meltbility Excessive rising.Therefore, (SiO₂+Al₂O₃) mole and it is the upper limit preferably 65.0%, more preferable 60.0%, further preferably 50.0%, still more preferably 45.0%, most preferably 40.0%.

Molar ratio (Ln₂O₃/Rn₂O) be 0.3 or more when, be easy to get improve glass chemistry durability effect.Therefore, (Ln₂O₃/Rn₂O lower mole ratio limit) preferably 0.3, more preferable 0.5, most preferably 0.7.

In particular, by making molar ratio (Ln₂O₃/Rn₂O) 8.0 hereinafter, being able to suppress the deterioration of glass raw material meltbility And the excessive rising of viscosity.Therefore, the upper limit preferably 8.0, more preferable 5.0, further preferred 3.0.

In addition, not containing Rn₂When O ingredient, by (Ln₂O₃/Rn₂O) value is set as infinitely great.

Mole and (ZrO₂+TiO₂+Nb₂O₅+Ta₂O₅+WO₃+Bi₂O₃+TeO₂) be 20.0% or less when, be easy to get raising The effect of devitrification resistance, in addition, being easy to inhibit the excessive reduction of Abbe number to obtain low dispersion performance.Therefore, (ZrO₂+TiO₂+ Nb₂O₅+Ta₂O₅+WO₃+Bi₂O₃+TeO₂) mole and the upper limit preferably 20.0%, it is more preferable 15.0%, further preferred 10.0%, Still more preferably 5.0%, still further preferably 3.0%, again still more preferably 1.0%, most preferably 0.1%.

Molar ratio (Ln₂O₃+SiO₂+Al₂O₃)/(RO+Rn₂O+B₂O₃) be 0.2 or more when, be easy to get raising glass chemistry The effect of durability.Therefore, (Ln₂O₃+SiO₂+Al₂O₃)/(RO+Rn₂O+B₂O₃) lower mole ratio limit preferably 0.2, more preferably 0.3, further preferred 0.4, most preferably 0.5.

On the other hand, by make the molar ratio 3.0 hereinafter, be able to suppress glass raw material meltbility deterioration and viscosity Excessively rise.Therefore, (Ln₂O₃+SiO₂+Al₂O₃)/(RO+Rn₂O+B₂O₃) the molar ratio upper limit preferably 3.0, it is more preferable 2.0, into One step preferably 1.5.

In addition, not containing RO, Rn₂O、B₂O₃When ingredient, by (Ln₂O₃+SiO₂+Al₂O₃)/(RO+Rn₂O+B₂O₃) value is set as It is infinitely great.

Molar ratio (Ln₂O₃/ RO) be 0.1 or more when, be easy to get improve glass chemistry durability effect.Therefore, (Ln₂O₃/ RO) lower mole ratio limit preferably 0.1, more preferable 0.2, further preferred 0.3.

In addition, when not containing RO ingredient, by (Ln₂O₃/ RO) value is set as infinitely great.

Mole product (BaO × Gd₂O₃) be lower than 5.0 when, be easy to get while inhibiting the effect of specific gravity of glass and cost.Therefore, (BaO×Gd₂O₃) a mole product upper limit be preferably shorter than 5.0, more preferable 3.0, be further preferred 2.0, still more preferably 1.0, most It is preferred that 0.1.

< is about the ingredient > that should not contain

Hereinafter, by being illustrated to the ingredient that should not contain in optical glass of the present invention and the ingredient not preferably comprised.

In the range of not damaging the glass performance of the present application, other compositions can be added as needed.However, removing Other than Ti, Zr, Nb, W, La, Gd, Y, Yb, Lu, no matter each transiting metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo It is so that individually or complex form, even if a small amount of content, glass can also be coloured, and it has and produces to the specific wavelength of visual field Therefore the raw property absorbed especially in the optical glass using visibility region wavelength, recommends to contain substantially no.

Nd₂O₃Ingredient is stronger on glass coloration influence, therefore recommends to contain substantially no, that is to say, that except inevitable Outside being mixed into, it has been entirely free of.

Er₂O₃Ingredient is stronger on glass coloration influence, therefore recommends to contain substantially no, that is to say, that except inevitable Outside being mixed into, it has been entirely free of.

In addition, the ingredient of the lead compounds such as PbO, because environmental pressure is heavier, therefore recommends to contain substantially no, that is to say, that In addition to being inevitably mixed into, it has been entirely free of.

In addition, As₂O₃The ingredient of equal arsenic compounds etc because environmental pressure is heavier, therefore is recommended to contain substantially no, That is being entirely free of in addition to being inevitably mixed into.

In turn, each ingredient of Th, Cd, Tl, Os, Be and Se is used as harmful chemical and by control in recent years, Under this trend, not only in the manufacturing process of glass, in the disposition after manufacturing procedure and commercialization, all need to take maintenance The measure of environmental protection.Therefore, in the case where paying attention to environment influences, recommendation contains substantially no these ingredients.

[physical property]

Optical glass of the invention is preferably provided with middle refractive index and high Abbe number (low dispersion).In particular, light of the invention Learn glass refraction (n_d) lower limit preferably 1.58, it is more preferable 1.60, further preferred 1.62, still more preferably 1.63, it is optimal Select 1.64.The refractive index (n_d) upper limit preferably 1.80, more preferable 1.75, further preferred 1.70, most preferably 1.68.

In addition, optical glass Abbe number (ν of the invention_d) lower limit preferably 35, it is more preferable 38, further preferred 40, more into One step preferably 45, most preferably 50.The Abbe number (ν_d) upper limit preferably 65, but preferably 64, more preferable 63, further preferred 62, more Further preferred 61, most preferably 60.

By even if pursuing the slimming of optical module, can also obtain biggish anaclasis amount with this middle refractive index. In addition, the focus offset because of caused by the wavelength of light can be reduced when using as simple lens by with this low dispersion (color difference).It therefore, being capable of conduct when combining with the optical module with high dispersive (Abbe number is lower) and constituting optical system The entirety of the optical system reduces aberration, and then pursue higher imaging characteristic etc..

In this way, optical glass of the invention is beneficial in optical design, it, can be in reality especially when constituting optical system Now whiles higher imaging characteristic etc., the miniaturization of optical system is realized, expand the freedom degree of optical design.

The preferably small specific gravity of optical glass of the invention.Specifically, optical glass specific gravity of the invention is below 5.00.By This can reduce the quality of optical module and the optical device using it, help to keep optical device slimmer and more graceful.Therefore, of the invention The optical glass specific gravity upper limit preferably 5.00, more preferable 4.70, further preferred 4.50.In addition, optical glass specific gravity of the invention It is more specifically 3.00 or more mostly 2.80 or more, further specifically 3.20 or more.

" the optics glass of optical glass specific gravity of the invention based on Japanese Optical Glass industry meeting standard JOGIS05-1975 The measuring method of glass specific gravity " is measured.

The preferred low value of multiplying (d × RA) value of specific gravity of glass (d) and powder method acid resistance grade (RA).It is more specific and Speech, (d × RA) multiplying value of the invention are 15.0 or less.

Thereby, it is possible to make with good acid resistance, and the lens that specific gravity is lighter, to be easier production suitable for vehicle-mounted Or the first-class purposes of monitoring camera more merrily and lightheartedly and to acid rain etc. has indefatigable optical module.

Therefore, the multiplying value upper limit preferably 15.0 of (d × RA) of the invention, more preferable 14.0, further preferably 13.0, still more preferably 12.0, still further preferably 11.0, again still more preferably 10.5, most preferably 10.0.

In addition, the lower limit value of (d × RA) multiplying value of optical glass of the invention is not particularly limited, but mostly It is 3.0 or more, is more specifically 5.0 or more, further specifically 6.5 or more.

Optical glass of the invention preferably has compared with highly-acidproof.In particular, on the basis of JOGIS06-1999 based on The chemical durability (acid resistance) of glass powder method measurement is preferably 1~4 grade, and more preferably 1~3 grade.

As a result, other than improving the processability of optical glass, in the purposes such as vehicle-mounted in use, due to reducing because of acid rain The glass Deng caused by is fuzzy, therefore the production for being originated from the optical module of glass becomes more convenient.

" acid resistance " herein refers to, for the durability of glass acid attack, which can pass through Japanese Optical glass Glass industry meeting standard " measuring method of optical glass chemical durability " JOGIS06-1999 is measured.In addition, " powder method The chemical durability (acid resistance) of measurement is 1~3 grade " refer to, the chemical durability carried out based on JOGIS06-1999 standard (acid resistance), the reduction rate of rear sample mass is lower than 0.65 mass % before the assay.

In addition, " 1 grade " of chemical durability (acid resistance) refers to the reduction rate of measurement front and back sample mass lower than 0.20 matter % is measured, " 2 grades " refer to that the reduction rate of measurement front and back sample mass is 0.20 mass % more than or lower than 0.35 mass %, " 3 grades " The reduction rate for referring to measurement front and back sample mass is 0.35 mass % more than or lower than 0.65 mass %, before " 4 grades " refer to measurement The reduction rate of sample mass is 0.65 mass % more than or lower than 1.20 mass % afterwards, and " 5 grades " refer to measurement front and back sample mass Reduction rate be 1.20 mass % more than or lower than 2.20 mass %, " 6 grades " refer to measurement front and back sample mass reduction rate be 2.20 mass % or more.

The preferred devitrification resistance of optical glass of the invention is high, specifically, it is preferable that having lower liquidus temperature.

That is, preferably 1200 DEG C of the optical glass liquidus temperature upper limit of the invention, it is 1150 DEG C more preferable, further preferred 1100 ℃.In this way, can also reduce the crystallization of made glass even if the glass after melting flows out at lower temperatures, thus may be used Devitrification when forming glass from molten condition is reduced, the influence of the optical characteristics of the optical module constituted to glass is reduced.This Outside, even if reducing the melting temperature of glass, forming of glass can also be made, therefore, consumed energy when by inhibiting forming of glass, The manufacturing cost of glass can be reduced.

On the other hand, the lower limit of optical glass liquidus temperature of the invention is not particularly limited, but institute through the invention Obtained glass liquidus temperature is substantially at 800 DEG C or more, specially 850 DEG C or more, more specifically 900 DEG C or more.In addition, this theory " liquidus temperature " in bright book refers to kept for 30 minutes in the temperature dip furnace for having 1000 DEG C~1150 DEG C temperature gradients after, It is fetched into outside furnace and is cooled down, then whether there is or not the minimum temperatures that can't see crystallization when crystallization with 100 times of multiplying power of micro- sem observation.

[manufacturing method]

Optical glass of the invention can make in the following manner.That is, by above-mentioned raw materials each ingredient regulation amount It uniformly mixes in range, then manufactured mixture is put into platinum alloy crucible, electricity is put into according to the melting difficulty that glass forms After furnace melts 2~6 hours within the temperature range of 1100~1340 DEG C, proper temperature is stirred evenly and be cooled to, is then cast Slow cooling is carried out into model to be finally made.

[forming of glass]

Glass of the invention can carry out melting forming by known method.In addition, the manufacturing process to glass melt does not have There is restriction.

[glass shaping body and optical module]

Grinding and polishing processing method etc. can be used to make glass shaping body for glass of the invention.That is, can to glass into Row grinding and polishing etc. are machined and make glass shaping body.In addition, the method for production glass shaping body is not limited to above-mentioned side Method.

Therefore, the glass shaping body formed by glass of the invention, because having good durability processability is good It is good, and because caused by acid rain etc. glass deterioration it is smaller, can be used in vehicle-mounted equal on the way.

Embodiment

1~table of table 10 shows the refractive index (n of Glazing example of the invention, the composition of comparative example and such glass_d), Ah Shellfish number (ν_d), specific gravity (d), powder method acid resistance grade (RA) and liquidus temperature.In addition, following embodiment is only used as example to use, The present invention is not limited to these embodiments.

The glass of the embodiment of the present invention and comparative example makes as follows: as each component materials, selecting respectively comparable The usually optical glass such as oxide, hydroxide, carbonate, nitrate, fluoride, hydroxide, metaphosphoric acid compound is made High-purity raw is weighed and is uniformly mixed, reaches the composition ratio of each embodiment shown in table, be then placed in platinum It in crucible, is put into electric furnace according to the melting difficulty that glass forms, it is small that 2~5 is melted in 1100~1350 DEG C of temperature ranges Shi Hou is cast to after mixing evenly in model etc., is finally carried out slow cooling and is made glass.

Herein, the glass refraction and Abbe number of Examples and Comparative Examples are based on Japanese Optical Glass industry meeting standard JOGIS01-2003 is measured.Refractive index and Abbe number herein are by the slow cooling cooling rate to -25 DEG C/hr of warp Obtained from glass be measured and find out.

The specific gravity of the glass of Examples and Comparative Examples is based on Japanese Optical Glass industry meeting standard JOGIS05-1975's " optical glass gravity test method " is measured.

The glass acid resistance of Examples and Comparative Examples with Japanese Optical Glass industry can standard " optical glass chemistry is durable Property measuring method " JOGIS06-1999 is measured for standard.That is, the glass specimen for 425~600 μm of granularity will be crushed It is placed in specific gravity bottle, is put into platinum cage.Platinum cage is put into the quartz glass rounding bottom long-neck that joined 0.01N aqueous solution of nitric acid In bottle, handled 60 minutes in boiling water.The reduction rate (quality %) of glass specimen after calculation processing, by the reduction rate (quality %) The case where lower than 0.20, is set as 1 grade, by reduction rate be 0.20~be lower than 0.35 the case where be set as 2 grades, by reduction rate be 0.35~ The case where lower than 0.65, is set as 3 grades, by reduction rate be 0.65~be lower than 1.20 the case where be set as 4 grades, by reduction rate be 1.20~ The case where lower than 2.20, is set as 5 grades, and the situation that reduction rate is 2.20 or more is set as 6 grades.At this point, series is smaller, it is meant that glass Glass acid resistance is more excellent.

The glass liquidus temperature of Examples and Comparative Examples is in the temperature dip for having 1000 DEG C~1150 DEG C temperature gradients It is kept for 30 minutes, is fetched into after carrying out cooling outside furnace in furnace, whether there is or not can't see knot when crystallization with 100 times of multiplying power of micro- sem observations The minimum temperature found out when brilliant.

In addition, the case where being recorded as " 1000 DEG C or less ", which refers to, at least can't see crystallization at 1000 DEG C.

[table 1]

[table 2]

[table 3]

[table 4]

[table 5]

[table 6]

[table 7]

[table 8]

[table 9]

[table 10]

It is as shown in the table, the optical glass of the embodiment of the present invention because mole and (SiO₂+B₂O₃) it is 40.0~75.0%, Ln₂O₃Ingredient (in formula, Ln for selected from La, Gd, Y, Lu at one or more of group) mole and be 3.0%~25.0%, Rn₂O ingredient (in formula, Rn for selected from Li, Na, K at one or more of group) mole and for greater than 0%~25.0% with Under, so can obtain with outstanding durability, and the optical glass with desired optical constant.

In addition, the optical glass of the embodiment of the present invention, refractive index (n_d) 1.60 or more, more specifically for 1.64 with On, while the refractive index (n_d) 1.80 hereinafter, in the desired range.

In addition, the optical glass of the embodiment of the present invention, Abbe number (ν_d) 65 hereinafter, the Abbe number (ν simultaneously_d) it is 35 More than, it is more specifically 40 or more, in desired range.

In addition, optical glass of the invention can form stable glass, devitrification is not easy to cause when making glass.These effects Fruit can also optical glass liquidus temperature through the invention be 1150 DEG C hereinafter, being more specifically 1100 DEG C or less to speculate.

In addition, the optical glass of the embodiment of the present invention, specific gravity is 4.00 hereinafter, be more specifically 3.60 or less.By Optical glass specific gravity of embodiment of the present invention is smaller known to this.

In addition, the optical glass of the embodiment of the present invention, the chemical durability (acid resistance) of powder method measurement is 1~4 grade, In desired range.

In turn, the optical glass of the embodiment of the present invention, specific gravity of glass (d) and powder method acid resistance grade (RA) multiplying D × RA value is 15.0 or less.

Therefore, the optical glass of the embodiment of the present invention, refractive index (n_d) and Abbe number (ν_d) in desired range, together When rate of specific gravity all have 5.00 the following values, and the chemical durability (acid resistance) of powder method measurement is 1~4 grade, specific gravity of glass (d) it is in desired range with multiplying d × RA value of powder method acid resistance grade (RA).It can thus be appreciated that the present invention is implemented The optical glass of example has good chemical durability while slimmer and more graceful.

On the other hand, in the optical glass of comparative example, Ln₂O₃Ingredient (in formula, Ln for selected from La, Gd, Y, Lu institute at group One or more of) mole and be lower than 3.0%, the multiplying d of specific gravity of glass (d) and powder method acid resistance grade (RA) × RA value is greater than 15.0, and therefore, specific gravity is lighter, can not obtain the glass material with good chemical durability.

In turn, glass blocks is formed using the optical glass of the embodiment of the present invention, which is ground and is polished, is added Work is at lens and prism shape.Its result can steadily be processed into various lens and prism shape.

More than, it is illustrated in detail with illustrating purpose to the present invention, it should be understood that the purpose of the present embodiment is only used In illustration, those skilled in the art can be variously changed it in the case where not departing from inventive concept and range.

Claims

1. a kind of optical glass,

In terms of mole %:

Mole and SiO₂+B₂O₃It is 40.0~75.0%；

Ln₂O₃Ingredient mole and be 3.0%~25.0%, in formula, Ln for selected from La, Gd, Y, Lu at a kind in group with On；

Rn₂O ingredient mole and for greater than 0%~25.0% hereinafter, in formula, Rn for selected from Li, Na, K at a kind in group More than；

Multiplying d × RA value of specific gravity of glass (d) and powder method acid resistance grade (RA) be 15.0 hereinafter,

The optical glass has 1.58 or more 1.80 refractive index (n below_d), and there are 35 or more 65 Abbe numbers below (ν_d)。

2. optical glass according to claim 1, wherein

In terms of mole %:

SiO₂Ingredient 5.0~60.0%

B₂O₃Ingredient 0~70.0%

Al₂O₃Ingredient 0~25.0%,

La₂O₃Ingredient 0~25.0%,

Y₂O₃Ingredient 0~25.0%,

Gd₂O₃Ingredient 0~25.0%,

Lu₂O₃Ingredient 0~5.0%,

Yb₂O₃Ingredient 0~5.0%,

ZrO₂Ingredient 0~10.0%,

TiO₂Ingredient 0~10.0%,

Nb₂O₅Ingredient 0~10.0%,

Ta₂O₅Ingredient 0~5.0%,

WO₃Ingredient 0~5.0%,

ZnO component 0~30.0%,

MgO ingredient 0~30.0%,

CaO ingredient 0~35.0%,

SrO ingredient 0~30.0%,

BaO ingredient 0~30.0%,

Li₂O ingredient 0~20.0%,

Na₂O ingredient 0~15.0%,

K₂O ingredient 0~15.0%,

GeO₂Ingredient 0~10.0%,

Ga₂O₃Ingredient 0~10.0%,

P₂O₅Ingredient 0~10.0%,

Bi₂O₃Ingredient 0~5.0%,

TeO₂Ingredient 0~5.0%,

SnO₂Ingredient 0~3.0%,

Sb₂O₃Ingredient 0~1.0%.

3. optical glass according to claim 1 or 2, wherein

Molar ratio (SiO₂+Al₂O₃)/B₂O₃It is 0.1 or more.

4. optical glass according to any one of claim 1 to 3, wherein

Mole and SiO₂+Al₂O₃It is 8.0~65.0%.

5. optical glass according to any one of claim 1 to 4, wherein

Molar ratio Ln₂O₃/Rn₂O is 0.3 or more.

6. optical glass according to any one of claim 1 to 5, wherein

Mole and ZrO₂+TiO₂+Nb₂O₅+Ta₂O₅+WO₃+Bi₂O₃+TeO₂It is 0~20.0%.

7. optical glass according to any one of claim 1 to 6, wherein

Molar ratio (Ln₂O₃+SiO₂+Al₂O₃)/(RO+Rn₂O+B₂O₃) it is 0.2~3.0.

8. optical glass according to any one of claim 1 to 7, wherein

Mole product BaO × Gd₂O₃Lower than 5.0%.

9. optical glass according to any one of claim 1 to 8, wherein

The chemical durability (acid resistance) of powder method measurement has 1 grade~4 grades.

10. optical glass according to any one of claim 1 to 9, wherein

RO ingredient mole and be 40.0% hereinafter, in formula, R be selected from Zn, Mg, Ca, Sr, Ba at one or more of group.

11. a kind of preform is made of optical glass according to any one of claims 1 to 10.

12. a kind of optical module is made of optical glass according to any one of claims 1 to 10.

13. a kind of optical apparatus has optical module described in claim 12.