CN106927674A

CN106927674A - A kind of optical glass, prefabricated component and optical element

Info

Publication number: CN106927674A
Application number: CN201610994574.4A
Authority: CN
Inventors: 吉川健; 永冈敦
Original assignee: Ohara Inc
Current assignee: Ohara Inc
Priority date: 2015-11-11
Filing date: 2016-11-10
Publication date: 2017-07-07
Also published as: TWI789340B; TW202313501A; TW201718421A

Abstract

The present invention is obtained in that a kind of refractive index (n_d) and Abbe number (ν_d) in required scope, and partial dispersion ratio (θ g, F) less optical glass.The optical glass, it is calculated with quality %, contains SiO₂Composition 10.0~70.0%, Nb₂O₅Composition 1.0~50.0% and Na₂O compositions 1.0~30.0%, with less than more than 1.62 1.75 refractive index (n_d), less than more than 30 42 Abbe number (ν_d) and less than 0.594 partial dispersion ratio (θ g, F).

Description

A kind of optical glass, prefabricated component and optical element

Technical field

The present invention relates to a kind of optical glass, prefabricated component and optical element.

Background technology

The optical system such as digital camera and video camera, more or less there is the color fringe (color referred to as aberration Fringing) phenomenon.This aberration is divided into monochromatic aberration and chromatic aberation, particularly chromatic aberation and depends greatly on optics The material property of the lens used in system.

Usual chromatic aberation is corrected by the concavees lens of the convex lens and dispersion high that combine low dispersion, but this combination only may be used To correct the aberration of red area and green area, and remain the aberration of blue region.This blue region that cannot be removed Aberration is referred to as second order spectrum.Correction second order spectrum needs to consider the g lines (435.835nm) of blue region when optical design is carried out Trend.Now, as the index of the optical characteristics got most of the attention in optical design, using partial dispersion ratio (θ g, F). In the optical system of the combinations thereof lens of low dispersion and the lens of dispersion high, use by the lens of low dispersion side The larger optical material of partial dispersion ratio (θ g, F), and it is smaller using partial dispersion ratio (θ g, F) in the lens of dispersion side high Optical material, so as to correct second order spectrum well.

Partial dispersion ratio (θ g, F) is represented by below equation (1).

θ g, F=(n_g- n_F)/(n_F- n_C)……(1)

In optical glass, in the partial dispersion ratio (θ g, F) and Abbe number of the partial dispersion for representing short wavelength region (ν_d) between, with substantially linear relation.Represent the straight line of this relation be the longitudinal axis with partial dispersion ratio (θ g, F), with Abbe Number (ν_d) on the rectangular co-ordinate of transverse axis, with connection mark and draw NSL7 and PBM2 partial dispersion ratio and 2 points of Abbe number straight Line represents, referred to as normal line (reference picture 1).As the normal glass of the benchmark of normal line, although according to optical glass manufactory Family it is different and different, but each producer is defined that (NSL7 and PBM2 are small using identical gradient and intercept The optical glass of former Co., Ltd.'s manufacture, the Abbe number (ν of PBM2_d) it is 36.3, partial dispersion ratio (θ g, F) is 0.5828, NSL7 Abbe number (ν_d) it is 60.5, partial dispersion ratio (θ g, F) is 0.5436.).

Herein, as with less than more than 30 42 Abbe number (ν_d) glass, such as light described in patent document 1,2 Glass is learned to be widely known by the people.

【Patent document 1】Japanese Patent Laid-Open 2002-029777 publications

【Patent document 2】Japanese Patent Laid-Open 2008-239478 publications

The technical problems to be solved by the invention

However, the glass disclosed in patent document 1, partial dispersion is not small, is insufficient as correcting the second order spectrum Lens and use.In addition, the glass disclosed in patent document 2, although with relatively small partial dispersion ratio, but Abbe Number is larger, therefore needs a kind of smaller glass of Abbe number.

The present invention is completed in view of the above problems, its object is to obtain a kind of refractive index (n_d) and Abbe number (ν_d) In required scope, and partial dispersion ratio (θ g, F) less optical glass.

The content of the invention

The present inventor etc. are being repeated the result of deep experiment and research to solve the above problems, and find Containing SiO₂Composition and Nb₂O₅In the glass of composition, can obtain with the high index of refraction in required scope and low Abbe number (dispersion high) and lower part dispersion than glass, so as to complete the present invention.

Specifically, the present invention provides optical glass as described below.

(1) a kind of optical glass, it is characterised in that calculated with quality %,

Contain SiO₂Composition is 10.0~70.0%,

Nb₂O₅Composition is 1.0~50.0%, and,

Na₂O compositions are 1.0~30.0%,

Also, with less than more than 1.62 1.75 refractive index (n_d),

Less than more than 30 42 Abbe number (ν_d),

Less than 0.594 partial dispersion ratio (θ g, F).

(2) optical glass according to above-mentioned (1), it is characterised in that calculated with quality %, B₂O₃The content of composition exists Less than 25.0%.

(3) optical glass according to above-mentioned (1) or (2), it is characterised in that mass ratio (Li₂O+Na₂O)/(ZrO₂) It is more than 0.50.

(4) optical glass described in any one according to above-mentioned (1) to (3), it is characterised in that calculated with quality %, Li₂The content of O compositions is below 20.0%.

(5) optical glass described in any one according to above-mentioned (1) to (4), it is characterised in that mass ratio (SiO₂)/ (SiO₂+B₂O₃) it is more than 0.50.

(6) optical glass described in any one according to above-mentioned (1) to (5), it is characterised in that mass ratio (SiO₂)/ (SiO₂+B₂O₃) it is less than 0.95.

(7) optical glass described in any one according to above-mentioned (1) to (6), it is characterised in that calculated with quality %, ZrO₂The content of composition is below 25.0%.

(8) optical glass described in any one according to above-mentioned (1) to (7), it is characterised in that calculated with quality %,

K₂O compositions are 0~20.0%,

TiO₂Composition is 0~20.0%,

MgO compositions are 0~10.0%,

CaO compositions are 0~10.0%,

SrO compositions are 0~10.0%,

BaO compositions are 0~20.0%,

Ta₂O₅Composition is 0~10.0%,

La₂O₃Composition is 0~10.0%,

Gd₂O₃Composition is 0~10.0%,

Y₂O₃Composition is 0~20.0%,

Yb₂O₃Composition is 0~10.0%.

P₂O₅Composition is 0~10.0%,

GeO₂Composition is 0~10.0%,

Al₂O₃Composition is 0~15.0%,

Ga₂O₃Composition is 0~10.0%,

WO₃Composition is 0~10.0%,

Bi₂O₃Composition is 0~10.0%,

ZnO component is 0~30.0%,

TeO₂Composition is 0~15.0%,

SnO₂Composition is 0~5.0%,

Sb₂O₃Composition is 0~1.0%.

(9) optical glass described in any one according to above-mentioned (1) to (8), it is characterised in that Rn₂The quality of O compositions Sum is less than more than 1.0% 30.0%, wherein, Rn is more than a kind selected from the group being made up of Li, Na, K.

(10) optical glass described in any one according to above-mentioned (1) to (9), it is characterised in that mass ratio Li₂O/ Rn₂O is more than 0.01.

(11) optical glass described in any one according to above-mentioned (1) to (10), it is characterised in that the quality of RO compositions Sum is less than 25.0%, wherein, R is more than a kind selected from the group being made up of Mg, Ca, Sr, Ba.

(12) optical glass described in any one according to above-mentioned (1) to (11), it is characterised in that Ln₂O₃The matter of composition Amount sum is less than 20.0%, wherein, Ln is more than a kind selected from the group being made up of Y, La, Gd, Yb.

(13) prefabricated component of a kind of polishing use and/or precise punch forming, it is characterised in that by above-mentioned (1) to (12) any one described in optical glass constitute.

(14) a kind of optical element, it is characterised in that the optical glass structure as described in any one of above-mentioned (1) to (12) Into.

Invention effect

In accordance with the invention it is possible to obtain a kind of refractive index (n_d) and Abbe number (ν_d) in required scope, and Partial dispersion ratio (θ g, F) less optical glass.

Brief description of the drawings

Fig. 1 be with partial dispersion ratio (θ g, F) be the longitudinal axis, with Abbe number (ν_d) for transverse axis rectangular co-ordinate in it is represented The schematic diagram of normal line.

Fig. 2 is partial dispersion ratio (θ g, F) and Abbe number (ν on embodiments of the invention_d) relation schematic diagram.

Fig. 3 is the refractive index (n on embodiments of the invention_d) and Abbe number (ν_d) relation schematic diagram.

Specific embodiment

Optical glass of the invention, is calculated with quality %, contains SiO₂Composition 10.0~70.0%, Nb₂O₅Composition 1.0~ 50.0% and Na₂O compositions 1.0~30.0%, with less than more than 1.62 1.75 refractive index (n_d), less than more than 30 42 Abbe number (ν_d) and less than 0.594 partial dispersion ratio (θ g, F).

Containing SiO₂Composition and Nb₂O₅In the glass of composition, can obtain with the high index of refraction in required scope and Low Abbe number (dispersion high) and lower part dispersion than glass.

Wherein, the first optical glass, is calculated with quality %, contains SiO₂Composition 10.0~70.0%, Nb₂O₅Composition 1.0~ 50.0% and Na₂O compositions 1.0~30.0%, B₂O₃The content of composition is less than 20.0%, with less than more than 1.62 1.75 Refractive index (n_d), less than more than 30 42 Abbe number (ν_d) and less than 0.594 partial dispersion ratio (θ g, F).

Containing SiO₂Composition and Nb₂O₅In the glass of composition, even if reducing B₂O₃The content of composition, it is also possible to obtain have High index of refraction and low Abbe number (dispersion high) and lower part dispersion in required scope than glass.

In addition, the second optical glass, is calculated with quality %, contain SiO₂Composition 10.0~70.0%, Nb₂O₅Composition 1.0~ 50.0% and Na₂O compositions 1.0~25.0%, mass ratio (Li₂O+Na₂O)/(ZrO₂) it is more than 0.50, with more than 1.64 Less than 1.70 refractive index (n_d), less than more than 31 42 Abbe number (ν_d) and less than 0.590 partial dispersion ratio (θ g, F).

Containing SiO₂Composition and Nb₂O₅In the glass of composition, particularly containing Na₂O compositions, and mass ratio (Li₂O+ Na₂O)/(ZrO₂) it is larger in the case of, it is also possible to obtain with the high index of refraction in required scope and low Abbe number (color high Dissipate) and lower part dispersion than glass.

In addition, the 3rd optical glass, is calculated with quality %, contain SiO₂Composition 10.0~70.0%, Nb₂O₅Composition 1.0~ 50.0%th, Na₂O compositions 1.0~25.0% and Li₂O compositions 0.1~20.0%, with the refractive index below more than 1.62 1.75 (n_d), less than more than 30 40 Abbe number (ν_d) and less than 0.594 partial dispersion ratio (θ g, F).

Containing SiO₂Composition and Nb₂O₅In the glass of composition, particularly containing Na₂O compositions and Li₂O compositions In the case of, it is also possible to obtain with the high index of refraction in required scope and low Abbe number (dispersion high) and lower part dispersion ratio Glass.

It is a kind of not only with required high index of refraction (n therefore, it is possible to obtain_d) and low Abbe number (ν_d) and part Dispersion ratio (θ g, F) is smaller and contributes to the optical glass of the chromatic aberation of reduction optical system.

In addition it is possible to obtain it is a kind of contribute to the lightweight of optical device because proportion is smaller, because to the saturating of visible ray Penetrate rate it is higher and can with it is preferable that for making the purposes of visible transmission, and also due to glass transition temperature it is relatively low and can With reduce reheating it is compressing when heating-up temperature optical glass.

Hereinafter, the implementation method to optical glass of the invention is specifically described, but the present invention does not receive following implementation Any restriction of mode, in the range of the purpose of the present invention, can suitably be changed and be implemented.Additionally, for explanation The part for repeating, the description thereof is omitted as appropriate sometimes, but does not limit the objective of invention.

[glass ingredient]

Hereinafter, the compositing range for constituting each composition of optical glass of the invention is illustrated.In this manual, such as Fruit is not particularly illustrated, and the content of each composition is represented with the quality % of the glass gross mass relative to oxide conversion composition. Herein, " oxide conversion composition " refer to, assuming that used as the raw material of glass constituent of the present invention oxide, In the case that complex salt, metal fluoride etc. are all decomposed and change into oxide in melting, by the total of the generation oxide Quality represents the composition of contained each composition in glass as 100 mass %.

SiO₂Composition is to promote the glass of stabilization to be formed, and reduces the devitrification (product of crystalline solid bad to optical glass It is raw) required composition.

Particularly, by making SiO₂Component content is more than 10.0%, it is not necessary to greatly improve partial dispersion ratio, you can to subtract Few devitrification.In addition, devitrification and coloring when can reduce reheating accordingly.Therefore, SiO₂The content of composition, it is usually desirable to More than 10.0%, 20.0% is more preferably greater than, more preferably more than 25.0%, more preferably it is greater than 30.0%, more preferably more than 32.0%, 34.0% is more preferably greater than, more preferably more than 35.0%.

On the other hand, by making SiO₂The content of composition makes refractive index be difficult to decline and can relatively hold below 70.0% Change places obtain required by high index of refraction, also, can also suppress partial dispersion than rising.In addition, can also suppress accordingly The meltbility of frit declines.Therefore, SiO₂The content of composition, it is usually desirable to less than 70.0%, more preferably Less than 60.0%, more preferably less than 50.0%, 45.0% is more preferably less than, be more preferably less than 43.0%, more preferably it is less than 40.0%.

SiO₂Composition, SiO can be used as raw material₂、K₂SiF₆、Na₂SiF₆Deng.

Nb₂O₅Composition is the refractive index of glass can be improved, so as to reduce Abbe number by making its content more than 1.0% And partial dispersion than required composition.Therefore, Nb₂O₅The content of composition, it is usually desirable to more than 1.0%, more preferably 4.0% is greater than, more preferably more than 7.0%, 10.0% is more preferably greater than, is more preferably more than 15.0%, 20.0% is more preferably greater than, more preferably more than 23.0%, 24.0% is more preferably greater than, More preferably it is more than 25.0%, is more preferably greater than 26.0%.

On the other hand, by making Nb₂O₅The content of composition is below 50.0%, it is possible to reduce the material cost of glass.Separately Outward, the rising of melting temperature when can suppress to manufacture glass, and can reduce due to Nb₂O₅The mistake that component content excessively causes Thoroughly.Therefore, Nb₂O₅The content of composition, it is usually desirable to less than 50.0%, is more preferably less than 40.0%, more preferable Be less than 35.0%, 31.0% is more preferably less than, more preferably less than 30.0%.

Nb₂O₅Composition, Nb can be used as raw material₂O₅Deng.

Na₂O compositions are, by making its content more than 1.0%, can reduce the partial dispersion ratio of glass, improve hot repressing Mouldability processed, reduces glass transition temperature, and can improve the required composition of the meltbility of frit.Therefore, Na₂O The content of composition, it is usually desirable to more than 1.0%, is more preferably greater than 3.0%, more preferably more than 5.0%, More preferably 6.0% is greater than, more preferably more than 8.5%, 10.0% is more preferably greater than, more preferably 11.0% is greater than, 12.0% is more preferably greater than.

On the other hand, by making Na₂The content of O compositions is less than 30.0%, can suppress the reduction of glass refraction, is made Chemical durability is difficult to decline, and also can reduce because of the devitrification that content excessively causes.

Therefore, Na₂The content of O compositions, it is usually desirable to less than 30.0, more preferably less than 25.0%, more Ideally less than 20.0%, 18.0% is more preferably less than, more preferably less than 15.0%, more preferably Less than 13.0%.

Na₂O compositions, Na can be used as raw material₂CO₃、NaNO₃、NaF、Na₂SiF₆Deng.

B₂O₃Composition is, when content is more than 0%, the glass of stabilization can be promoted to be formed and reduce devitrification, and also can be with Improve any condition of the meltbility of frit.Therefore, B₂O₃The content of composition, it is usually desirable to more than 0%, more manage That thinks is greater than 1.0%, more preferably more than 3.0%, is more preferably greater than 4.0%, is more preferably more than 5.5%, 7.5% is more preferably greater than, can also more preferably be more than 10.0%.

On the other hand, by making B₂O₃The content of composition can suppress reduction and the Abbe of refractive index below 25.0% Several risings, and also can suppress partial dispersion than rising.Therefore, B₂O₃The content of composition, it is usually desirable to 25.0% Hereinafter, more preferably less than 20.0%, more preferably less than 20.0%, 16.0% is more preferably less than, more Plus ideally less than 15.0%, more preferably it is less than 12.5%.

B₂O₃Composition, H can be used as raw material₃BO₃、Na₂B₄O₇、Na₂B₄O₇·10H₂O、BPO₄Deng.

Relative to ZrO₂The content of composition, Li₂O compositions and Na₂The sum-rate (mass ratio) of O compositions is more than 0.50 It is preferred.Accordingly, the meltbility of frit can be improved, the devitrification of glass is reduced, and also the hot repressing of glass can be improved Mouldability processed.Therefore, the mass ratio (Li₂O+Na₂O)/(ZrO₂), it is usually desirable to 0.50 it is lower limit, more preferably Be lower limit with 1.00, be lower limit more preferably with 1.30, be more preferably lower limit with 1.70, more preferably with 1.78 is lower limit.

On the other hand, the mass ratio (Li₂O+Na₂O)/(ZrO₂) the upper limit can be 1, but from reduce glass devitrification, carry From the point of view of the meltbility of frit high, it is usually desirable to less than 15.00,12.00 are more preferably less than, more Preferably might be less that 11.00.

ZrO₂Composition is, when content is more than 0%, can improve the refractive index of glass, reduces Abbe number, reduces part color Ratio is dissipated, and also any condition of devitrification can be reduced.In addition, devitrification and coloring when can reduce reheating accordingly.Cause This, ZrO₂The content of composition, it is usually desirable to more than 0%, is more preferably greater than 1.0%, is more preferably more than 1.5%, 3.0% is more preferably greater than, more preferably more than 4.0%, 5.0% is more preferably greater than, more 7.0% can also be preferably more than.

On the other hand, by making ZrO₂The content of composition is below 25.0%, it is possible to reduce devitrification, and also can hold very much Change places and obtain more uniform glass.Therefore, ZrO₂The content of composition, it is usually desirable to less than 25.0%, more preferably 20.0% is less than, more preferably less than 18.0%, 16.0% is more preferably less than, is more preferably less than 15.0%, 13.0% is more preferably less than, more preferably less than 10.0%, more preferably it is less than 8.0%.

ZrO₂Composition, ZrO can be used as raw material₂、ZrF₄Deng.

Li₂O compositions are, when its content is more than 0%, can to reduce the partial dispersion ratio of glass, improve reheating and are pressed into Type, reduces glass transition temperature, and also can improve any condition of the meltbility of frit.Particularly, In three optical glass, Li₂O compositions are, by making its content more than 0.1%, can reduce the partial dispersion ratio of glass, improve The compressing property of reheating, reduces glass transition temperature, and also can improve the required composition of the meltbility of frit.This Li in the optical glass of invention₂The content of O compositions, it is usually desirable to more than 0.1%, is more preferably greater than 0.5%, more Plus 2.0% is more preferably preferably greater than more than 1.0%, can also more preferably be more than 2.5%.

On the other hand, by making Li₂The content of O compositions is less than 20.0%, can suppress the reduction of refractive index, makes chemistry Durability is difficult to decline, and also can reduce because of the devitrification that content excessively causes.

Therefore, Li₂The content of O compositions, it is usually desirable to less than 20.0%, is more preferably less than 10.0%, more Plus ideally less than 8.0%, 5.0% is more preferably less than, more preferably less than 3.0%, more preferably Less than 1.4%.

Li₂O compositions, Li can be used as raw material₂CO₃、LiNO₃, LiF etc..

K₂O compositions are, when content is more than 0%, can reduce refractive index, improve the meltbility of frit, and also Any condition of glass transition temperature can be reduced.

On the other hand, by making K₂The content of O compositions be less than 20.0%, can suppress partial dispersion than rising, subtract Few devitrification, and also chemical durability can be made to be difficult to decline.It is additionally possible to suppress the reduction of the compressing property of reheating.Therefore, K₂The content of O compositions, it is usually desirable to less than 20.0%, more preferably less than 15.0%, more preferably it is less than 15.0%, 12.0% is more preferably less than, more preferably less than 11.0%, 10.0% is more preferably less than, 8.0% is more preferably less than, 5.0% is more preferably less than, more preferably less than 3.0%.

K₂O compositions, K can be used as raw material₂CO₃、KNO₃、KF、KHF₂、K₂SiF₆Deng.

TiO₂Composition is, when content is more than 0%, can improve refractive index, reduces Abbe number, and also can reduce mistake Saturating any condition.

On the other hand, by making TiO₂The content of composition is less than 20.0%, it is possible to reduce the coloring of glass, improves internal Transmissivity.In addition, partial dispersion ratio can be made to be difficult to rise accordingly, therefore it is readily available required lower part dispersion ratio.Cause This, TiO₂The content of composition, it is usually desirable to less than 20.0%, is more preferably less than 15.0%, more preferably Less than 10.0%, 5.0% is more preferably less than, more preferably less than 3.0%, is more preferably less than 1.0%, More preferably it is less than 0.1%.

TiO₂Composition, TiO can be used as raw material₂Deng.

MgO compositions are, when content is more than 0%, can to reduce any condition of the melting temperature of glass.

On the other hand, by making the content of MgO compositions below 10.0%, reduction and the Abbe of refractive index can be suppressed Several risings, and also devitrification can be reduced.Therefore, the content of MgO compositions, it is usually desirable to less than 10.0%, more manages That thinks is less than 5.0%, more preferably less than 3.0%, is more preferably less than 1.0%, is more preferably less than 0.5%.

MgO compositions, MgO, MgCO can be used as raw material₃、MgF₂Deng.

CaO compositions are, when content is more than 0%, can not only reduce the material cost of glass, reduce devitrification, and also Any condition of the meltbility of frit can be improved.

On the other hand, by making the content of CaO compositions below 10.0%, reduction and the Abbe of refractive index can be suppressed Several rising, partial dispersion than rising, and also devitrification can be reduced.Therefore, the content of CaO compositions, it is usually desirable to Less than 10.0%, 5.0% is more preferably less than, more preferably less than 3.0%, 1.9% is more preferably less than, More preferably it is less than 0.5%.

CaO compositions, CaCO can be used as raw material₃、CaF₂Deng.

SrO compositions are, when content is more than 0%, it is possible to reduce the devitrification of glass, and also can improve appointing for refractive index Meaning composition.

Particularly, by making the content of SrO compositions below 10.0%, can not only suppress the rising of Abbe number, may be used also To suppress the decline of chemical durability.Therefore, the content of SrO compositions, it is usually desirable to less than 10.0%, more preferably Less than 5.0%, more preferably less than 3.0%, more preferably it is less than 1.0%.

SrO compositions, Sr (NO can be used as raw material₃)₂、SrF₂Deng.

BaO compositions are, when content is more than 0%, it is possible to reduce devitrification, improve the melting of refractive index and frit Property, and any condition of glass material cost can also be reduced compared with other alkaline earth constituents.In addition, also can be to suppress The composition that the compressing property of reheating declines.

On the other hand, by making the content of BaO compositions below 20.0%, the rising of Abbe number can not only be suppressed, and And decline and the devitrification of chemical durability can also be suppressed.Therefore, the content of BaO compositions, it is usually desirable to 20.0% with Under, be more preferably less than 15.0%, more preferably less than 10.0%, be more preferably less than 5.0%.

BaO compositions, BaCO can be used as raw material₃、Ba(NO₃)₂Deng.

Ta₂O₅Composition is, when content is more than 0%, can improve the refractive index of glass, reduces partial dispersion ratio, and also Any condition of the devitrification of glass can be reduced.

On the other hand, by making Ta₂O₅The content of composition reduces rare mineral resource Ta below 10.0%₂O₅Composition Usage amount, and because glass is easily melted at a lower temperature, it is possible to reduce material cost and the production of glass Cost.In addition, can reduce because of Ta accordingly₂O₅The rising of the devitrification and Abbe number of the glass that component content excessively causes.Cause This, Ta₂O₅The content of composition, it is usually desirable to less than 10.0%, is more preferably less than 5.0%, more preferably small In 3.0%, 1.0% is more preferably less than, more preferably less than 0.5%.Particularly, from reduce glass material into From the point of view of this, Ta₂O₅The content of composition might be less that 0.1%.

Ta₂O₅Composition, Ta can be used as raw material₂O₅Deng.

La₂O₃Composition, Gd₂O₃Composition, Y₂O₃Composition and Yb₂O₃Composition is exceeded by making at least content of any one 0%, can improve the refractive index of glass, and also can reduce partial dispersion than any condition.

On the other hand, by making La₂O₃The content of composition can suppress the rising of Abbe number below 10.0%, reduce ratio Weight, and also devitrification can be reduced.Therefore, La₂O₃The content of composition, it is usually desirable to less than 10.0%, more preferably Less than 5.0%, more preferably less than 3.0%, 1.0% is more preferably less than.

In addition, by making Y₂O₃The content of composition can suppress the rising of Abbe number below 20.0%, reduce proportion, subtract Few devitrification.Therefore, Y₂O₃The content of composition, it is usually desirable to less than 20.0%, is more preferably less than 10.0%, more Ideally less than 5.0%, 3.0% is more preferably less than.

In addition, by making Gd₂O₃Composition and Yb₂O₃The content of composition below 10.0%, can suppress Abbe number respectively Rising, reduce proportion, reduce devitrification, and also material cost can be reduced.Therefore, Gd₂O₃Composition and Yb₂O₃Composition Content, it is usually desirable to respectively less than 10.0%, is more preferably respectively smaller than 5.0%, more preferably distinguishes Less than 3.0%, 1.0% is more preferably respectively smaller than.

La₂O₃Composition, Gd₂O₃Composition, Y₂O₃Composition and Yb₂O₃Composition, La can be used as raw material₂O₃、La (NO₃)₃·XH₂O (X is arbitrary integer), Y₂O₃、YF₃、Gd₂O₃、GdF₃、Yb₂O₃Deng.

P₂O₅Composition is, when content is more than 0%, it is possible to reduce any condition of the devitrification of glass.

On the other hand, by making P₂O₅The content of composition is below 10.0%, it is possible to reduce due to P₂O₅Component content is excessive The devitrification for causing.Therefore, P₂O₅The content of composition, it is usually desirable to less than 10.0%, is more preferably less than 5.0%, more Plus ideally less than 3.0%, more preferably it is less than 1.0%.

P₂O₅Composition, Al (PO can be used as raw material₃)₃、Ca(PO₃)₂、Ba(PO₃)₂、BPO₄、H₃PO₄Deng.

GeO₂Composition is, when content is more than 0%, can improve the refractive index of glass, and also can reduce devitrification Any condition.

On the other hand, by making GeO₂The content of composition is below 10.0%, it is possible to reduce GeO costly₂Composition makes Consumption, it is possible to reduce the material cost of glass.Therefore, GeO₂The content of composition, it is usually desirable to less than 10.0%, more 5.0% is ideally less than, more preferably less than 1.0%.

GeO₂Composition, GeO can be used as raw material₂Deng.

Al₂O₃Composition and Ga₂O₃Composition is, when at least the content of any one is more than 0%, can improve chemistry resistance to Long property, and also any condition of the devitrification of glass can be reduced.

On the other hand, by making Al₂O₃The content of composition is less than 15.0%, it is possible to reduce excessively caused due to content Devitrification.Therefore, Al₂O₃The content of composition, it is usually desirable to less than 15.0%, is more preferably less than 8.0%, more manages That thinks is less than 5.0%, is more preferably less than 3.0%.

On the other hand, by making Ga₂O₃The content of composition is less than 10.0%, it is possible to reduce excessively caused due to content Devitrification.Therefore, Ga₂O₃The content of composition, it is usually desirable to less than 10.0%, be more preferably less than 5.0%, more manage That thinks is less than 3.0%.

Al₂O₃Composition and Ga₂O₃Composition, Al can be used as raw material₂O₃、Al(OH)₃、AlF₃、Ga₂O₃、Ga(OH)₃ Deng.

WO₃Composition is, when content is more than 0%, can to improve refractive index and reduce Abbe number, reduces the devitrification of glass, And also any condition of the meltbility of frit can be improved.

On the other hand, by making WO₃The content of composition is less than 10.0%, and partial dispersion ratio can be made to be difficult to rise, and And, internal transmission rate can also be improved by reducing the coloring of glass.Therefore, WO₃The content of composition, it is usually desirable to Less than 10.0%, 5.0% is more preferably less than, more preferably less than 3.0%, more preferably it is less than 1.0%.

WO₃Composition, WO can be used as raw material₃Deng.

Bi₂O₃Composition is when content is more than 0%, can to improve refractive index and reduce Abbe number, and also can reduce Any condition of glass transition temperature.

On the other hand, by making Bi₂O₃The content of composition is less than 10.0%, and partial dispersion ratio can be made to be difficult to rise, and And, internal transmission rate can also be improved by reducing the coloring of glass.Therefore, Bi₂O₃The content of composition, it is usually desirable to Less than 10.0%, 5.0% is more preferably less than, more preferably less than 3.0%, more preferably it is less than 1.0%.

Bi₂O₃Composition, Bi can be used as raw material₂O₃Deng.

ZnO component is, when content is more than 0%, it is possible to reduce the devitrification of glass, reduces partial dispersion ratio, and also can To reduce any condition of glass transition temperature.

On the other hand, it is less than 30.0% by making the content of ZnO component, can not only reduces mistake when glass is reheated Saturating and coloring, can also improve chemical durability.Therefore, the content of ZnO component, it is usually desirable to less than 30.0%, more 20.0% is ideally less than, more preferably less than 10.0%, 5.0% is more preferably less than, more preferably 3.0% is less than, 2.0% is more preferably less than, more preferably less than 1.0%.

ZnO component, ZnO, ZnF can be used as raw material₂Deng.

TeO₂Composition is, when content is more than 0%, can improve refractive index, reduces partial dispersion ratio, and also can drop Any condition of lower glass transition temperatures.

On the other hand, by making TeO₂The content of composition is less than 15.0%, it is possible to reduce the coloring of glass simultaneously improves interior Portion's transmissivity.In addition, by reducing TeO costly₂The use of composition, can obtain more cheap glass.Therefore, TeO₂Into The content divided, it is usually desirable to less than 15.0%, is more preferably less than 10.0%, more preferably less than 5.0%, More preferably 3.0% is less than, more preferably less than 1.0%.

TeO₂Composition, TeO can be used as raw material₂Deng.

SnO₂Composition is, when content is more than 0%, can make the glass of melting becomes limpid (deaeration), and also can be with Improve any condition of the transmission of visible light of glass.

On the other hand, by making SnO₂The content of composition can make to be caused by the reduction of molten glass below 5.0% The coloring of glass and the devitrification of glass be difficult occur.Further, since SnO can be reduced₂Composition is with fusion apparatus (particularly The noble metals such as Pt) alloying, therefore fusion apparatus service life more long can be realized.Therefore, SnO₂The content of composition, than Preferably less than 5.0%, more preferably it is less than 3.0%, is more preferably less than 1.0%.

SnO₂Composition, SnO, SnO can be used as raw material₂、SnF₂、SnF₄Deng.

Sb₂O₃Composition is, when content is more than 0%, any condition that clearing glass can be made clear.

On the other hand, by making Sb₂O₃The content of composition can be not likely to produce it below 1.0% in glass melting Excessive foaming, therefore Sb can be made₂O₃Composition is difficult and fusion apparatus (noble metal such as particularly Pt) alloying.Therefore, Sb₂O₃The content of composition, it is usually desirable to less than 1.0% be the upper limit, more preferably with less than 0.5% be the upper limit, more Plus preferably with less than 0.1% be the upper limit.But, in the case where influence of the optical glass to environment is paid attention to, can be free of There is Sb₂O₃Composition.

Sb₂O₃Composition, Sb can be used as raw material₂O₃、Sb₂O₅、Na₂H₂Sb₂O₇·5H₂O etc..

Additionally, as the composition for making glass limpid, being not limited in above-mentioned Sb₂O₃Composition, can also use in glass system Make the well-known fining agent in field or their compositions.

Relative to SiO₂Composition and B₂O₃The total amount of composition, SiO₂The ratio (mass ratio) of component content can also be More than 0.10.Hereby it is possible to suppress the rising of the Abbe number of glass.Therefore, the mass ratio (SiO₂)/(SiO₂+B₂O₃), compare It is preferably lower limit with 0.10, is more preferably lower limit with 0.30, be lower limit more preferably with 0.50, more manages Think be with 0.65 be lower limit, can also be more preferably lower limit with 0.75.

On the other hand, the mass ratio (SiO₂)/(SiO₂+B₂O₃) the upper limit can also be 1, but from suppress glass transition The rising of temperature, reduces the devitrification of glass, from the point of view of the meltbility of raising frit, it is usually desirable to less than 1, more 0.98, more preferably less than 0.95 is ideally less than, 0.95, more preferably 0.93 is more preferably less than Hereinafter, more preferably less than 0.90, more preferably less than 0.88, more preferably less than 0.83, it is more preferable Be can also be below 0.80.

Rn₂O compositions (in formula, Rn be from the group being made up of Li, Na, K select more than one) content sum (quality Sum), it is usually desirable to less than more than 1.0% 30.0%.

Particularly, by making the quality sum more than 1.0, the meltbility of frit can be improved, and also can be with Reduce glass transition temperature.Therefore, Rn₂The total content of O compositions, it is usually desirable to more than 1.0%, more preferably big In 5.0%, more preferably more than 10.0%, can also more preferably be more than 12.0%.

On the other hand, by making the quality sum below 30.0%, the refractive index of glass can be made to be difficult to reduce, and Devitrification when can also reduce to form glass.Therefore, Rn₂The total content of O compositions, it is usually desirable to less than 30.0%, more Ideally less than 25.0%, more preferably less than 23.0%, 21.0% is more preferably less than, more preferably Less than 20.0%, 18.0% is more preferably less than.

Mass ratio Li₂O/Rn₂O, it may be desirable to more than 0.01.Accordingly, the partial dispersion ratio of glass can be reduced, is carried The compressing property of reheating high, can also reduce glass transition temperature.Therefore, mass ratio Li₂O/Rn₂O, it is usually desirable to More than 0.01,0.05 is more preferably greater than, more preferably more than 0.10, more preferably it is greater than 0.14.

On the other hand, mass ratio Li₂O/Rn₂The upper limit of O, it is more satisfactory from from the point of view of the devitrification for reducing glass It is 0.60, more preferably 0.50, more preferably can also be 0.40.

RO compositions (in formula, R be from the group being made up of Mg, Ca, Sr, Ba select more than one) content sum (matter Amount sum), it is usually desirable to below 25.0%.Accordingly, can suppress the rising of Abbe number, and also can reduce due to The devitrification of the excessive glass for causing of the content of these compositions.Therefore, the quality sum of RO compositions, it is usually desirable to 25.0% with Under, 15.0% is more preferably less than, more preferably less than 10.0%, 5.0% is more preferably less than, more manage That thinks is less than 2.0%.

Ln₂O₃Content sum (the matter of composition (in formula, Ln is more than a kind selected from the group being made up of La, Gd, Y, Yb) Amount sum), it is usually desirable to below 20.0%.Accordingly, it is possible to reduce the devitrification of glass, the rising of Abbe number is suppressed, and And material cost can also be reduced.Therefore, Ln₂O₃The quality sum of composition, it is usually desirable to less than 20.0%, it is even more ideal Be less than 15.0%, more preferably less than 10.0%, be more preferably less than 5.0%, be more preferably less than 3.0%, more preferably it is less than 1.0%.

Secondly, to the composition that should not contain in optical glass of the invention and do not contain the composition being preferred and say It is bright.

For other compositions, can as needed be added in the range of the glass performance for not destroying the present application Plus.But, in addition to Ti, Zr, Nb, W, La, Gd, Y, Yb, Lu, the various mistakes such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo Cross metal ingredient, though with individually or mixedly containing a small amount of each composition in the case of glass can also colour, pair can See the characteristic that the specific wavelength in region is absorbed, therefore particularly in using the optical glass of the wavelength of visibility region, it is real Do not contained on border and be preferred.

In addition, the lead compound such as PbO and As₂O₃It is due to being environmental pressure composition higher therefore real Deng arsenic compound Do not contained on border and be preferred, i.e., do not contained without exception in addition to being inevitably mixed into and be preferred.

Additionally, each composition of Th, Cd, Tl, Os, Be and Se, have in recent years and limit it as harmful chemical and use Trend, not only in the production process of glass, and manufacturing procedure and until commercialization after treatment on, be required for Environmental protective measure.Therefore, in the case where the influence to environment is paid attention to, these compositions are not contained actually and is preferred.

[manufacture method]

Optical glass of the invention, for example, being carried out as follows manufacture.That is, to make each composition in the content model of regulation Enclose interior and equably mix above-mentioned raw materials, manufactured mixture is being put into platinum crucible, silica crucible or alumina crucible In carry out pre-fusion after, be put into golden crucible, platinum crucible, platinum alloy crucibles or iridium crucible and in 1100~1400 DEG C of temperature Melted 3~5 hours in the range of degree, uniform stirring simultaneously carries out froth breaking etc., temperature is then reduced to 1000~1400 DEG C laggard The final stirring of row and remove striped, and poured into and make in mould its Slow cooling and manufactured.

Now, as frit, it is usually desirable to use meltbility material higher.Accordingly, due to can be more Low temperature and melted in the shorter time, therefore the production efficiency of glass can be improved, and reduced production cost.In addition, by Reaction in the volatilization that can reduce composition and with crucible etc., therefore can relatively easily obtain the less glass of coloring.

Optical glass of the invention has the Abbe number in high index of refraction and prescribed limit.

Refractive index (the n of optical glass of the invention_d), it is usually desirable to 1.62 be lower limit, more preferably with 1.63 is lower limit, is lower limit more preferably with 1.64, is more preferably lower limit with 1.65.The upper limit of the refractive index, Desirably 1.75, more preferably 1.74, more preferably 1.72, more preferably 1.70, it is more preferable Be can also be for 1.68.

Abbe number (the ν of optical glass of the invention_d), it is usually desirable to below 42, more preferably 40 with Under, more preferably less than 39, more preferably less than 38.On the other hand, the Abbe number of optical glass of the invention (ν_d), it is usually desirable to 30 it is lower limit, is more preferably lower limit with 32, is lower limit more preferably with 33, more It is ideally lower limit with 34.

Optical glass of the invention with such refractive index and Abbe number is beneficial to optical design, particularly, no The miniaturization of imaging characteristic higher etc. and optical system can be only realized, the free degree that can be designed with expansion optical

Herein, optical glass of the invention, refractive index (n_d) and Abbe number (ν_d), it is usually desirable to meet (- 0.012ν_d+2.04)≦n_d≤ (- 0.012 ν_d+ 2.16) relation.The glass of specific composition of the invention, by making refractive index (n_d) and Abbe number (ν_d) meet the relation, you can to obtain the glass for being more difficult to produce devitrification.

Therefore, in optical glass of the invention, refractive index (n_d) and Abbe number (ν_d), it is usually desirable to meet n_d ≤ (- 0.012 ν_d+ 2.04) relation, more preferably meets n_d≤ (- 0.012 ν_d+ 2.05) relation, more preferably It is to meet n_d≤ (- 0.012 ν_d+ 2.06) relation, more preferably meets n_d≤ (- 0.012 ν_d+ 2.08) relation.

On the other hand, in optical glass of the invention, refractive index (n_d) and Abbe number (ν_d), it is usually desirable to it is full Sufficient n_d≤ (- 0.012 ν_d+ 2.16) relation, more preferably meets n_d≤ (- 0.012 ν_d+ 2.14) relation, more manages What is thought is to meet n_d≤ (- 0.012 ν_d+ 2.13) relation, more preferably meets n_d≤ (- 0.012 ν_d+ 2.12) pass System.

Optical glass of the invention, with relatively low partial dispersion ratio (θ g, F).

More specifically, the partial dispersion ratio (θ g, F) of optical glass of the invention, it is usually desirable to 0.594 for upper Limit, is more preferably the upper limit with 0.592, is the upper limit more preferably with 0.590, is more preferably with 0.588 The upper limit.The lower limit of the partial dispersion ratio (θ g, F), it is usually desirable to 0.570, more preferably 0.573, it is more preferable It is 0.575, more preferably 0.576, more preferably can also be 0.577.

In addition, the partial dispersion ratio (θ g, F) of optical glass of the invention and Abbe number (ν_d) between, it is usually desirable to Meet (- 0.00162 × ν_d+ 0.630)≤(θ g, F)≤(- 0.00162 × ν_d+ 0.652) relation.

Accordingly, due to being obtained in that the optical glass with relatively low partial dispersion ratio (θ g, F), therefore by the optical glass The optical element of formation can aid in the chromatic aberation for reducing optical system.

Therefore, in optical glass of the invention, partial dispersion ratio (θ g, F) and Abbe number (ν_d), it is usually desirable to Meet θ g, F≤(- 0.00162 × ν_d+ 0.630) relation, more preferably meets θ g, F≤(- 0.00162 × ν_d+ 0.632) relation, more preferably meets θ g, F≤(- 0.00162 × ν_d+ 0.634) relation.

On the other hand, in optical glass of the invention, partial dispersion ratio (θ g, F) and Abbe number (ν_d), it is more satisfactory Be to meet θ g, F≤(- 0.00162 × ν_d+ 0.652) relation, more preferably meets θ g, F≤(- 0.00162 × ν_d + 0.650) relation, more preferably meets θ g, F≤(- 0.00162 × ν_d+ 0.648) relation, more preferably Meet θ g, F≤(- 0.00162 × ν_d+ 0.646) relation, more preferably meets θ g, F≤(- 0.00162 × ν_d+ 0.643) relation.

Additionally, in above-mentioned partial dispersion ratio (θ g, F) and Abbe number (ν_d) relational expression in, by using gradient Specify these relations with normal line identical straight line, be shown to obtain compared with simple glass that partial dispersion ratio (θ g, F) is more Small glass.

Optical glass of the invention, is preferred so that proportion is smaller.More specifically, the proportion of optical glass of the invention exists 3.80(g/cm³) be preferred below.Accordingly, due to can mitigate optical element and using optical element optical instrument matter Amount, therefore can help realize the lightweight of optical instrument.Therefore, the proportion of optical glass of the invention, it is usually desirable to Be the upper limit with 3.80, be more preferably the upper limit with 3.50, be the upper limit more preferably with 3.30, more preferably with 3.10 is the upper limit, is the upper limit more preferably with 3.00.Additionally, the proportion of optical glass of the invention, probably with 2.50 with On, more particularly more than 2.70, more specifically more than 2.80 is in the majority.

The proportion of optical glass of the invention, can standard JOGIS05-1975 " optics glass based on the industry of Japanese Optical nitre The assay method of the proportion of glass " is measured.

Optical glass of the invention, to colour less being preferred.

Particularly, optical glass of the invention, spectral-transmission favtor is shown as 5% wavelength in the sample of thickness 10mm (λ₅), it is usually desirable in below 400nm, more preferably in below 380nm, more preferably in below 350nm.

In addition, optical glass of the invention, spectral-transmission favtor is shown as 80% wavelength in the sample of thickness 10mm (λ₈₀), it is usually desirable in below 450nm, more preferably in below 420nm, more preferably in below 400nm.

Accordingly, the absorption edge of glass will be located near ultraviolet region, improve the transparency of glass in visibility region, therefore Can by this optical glass preferably as the optical elements such as lens materials'use.

Optical glass of the invention, it may be desirable to the glass transition temperature below 650 DEG C.Accordingly, glass Soften at lower temperatures, therefore compression molding can be carried out to glass at lower temperatures.Furthermore it is also possible to pass through drop The oxidation of the low mould using compression molding come realize extend the mold use life-span.Therefore, the glass of optical glass of the invention Glass transition temperature, it is usually desirable to 650 DEG C be the upper limit, is more preferably the upper limit with 620 DEG C, more preferably It is the upper limit with 600 DEG C, is more preferably the upper limit with 580 DEG C, is the upper limit more preferably with 550 DEG C.

In addition, although the lower limit to the glass transition temperature of optical glass of the invention is not particularly limited, but originally The glass transition temperature of the optical glass of invention, it may be desirable to 460 DEG C be lower limit, more preferably with 480 DEG C Be lower limit, more preferably can also 500 DEG C be lower limit.

Optical glass of the invention, it may be desirable to less than 720 DEG C of yield points (At).Yield point, with glass Change transition temperature is the same, is a kind of index of the property of softening for representing glass, is also to represent the temperature being close with punch forming temperature The index of degree.Therefore, by using yield point below 720 DEG C glass, can at lower temperatures carry out compression molding, Therefore compression molding can more easily be carried out.Therefore, the yield point of optical glass of the invention, it is usually desirable to 720 DEG C be the upper limit, be more preferably the upper limit with 700 DEG C, be the upper limit more preferably with 690 DEG C, more preferably with 680 DEG C is the upper limit, is the upper limit more preferably with 660 DEG C, is more preferably the upper limit with 650 DEG C, more preferably It is the upper limit with 630 DEG C.

In addition, although the yield point to optical glass of the invention is not particularly limited, but desirably with 500 DEG C be lower limit, be more preferably lower limit with 530 DEG C, can also be more preferably lower limit with 560 DEG C.

Optical glass of the invention, is preferred so that average coefficient of linear expansion (α) is smaller.Particularly, optical glass of the invention Average coefficient of linear expansion, it is usually desirable to 150 × 10^{- 7}K^{- 1}It is the upper limit, more preferably with 120 × 10^{- 7}K^{- 1}For The upper limit, more preferably with 115 × 10^{- 7}K^{- 1}It is the upper limit, more preferably with 110 × 10^{- 7}K^{- 1}It is the upper limit, more manages What is thought is with 100 × 10^{- 7}K^{- 1}It is the upper limit.Accordingly, when punch forming is carried out to optical glass using mould, can subtract Few expansion caused due to the temperature change of glass and the total amount of contraction.Therefore, optical glass can be made very during punch forming Difficult fragmentation, can improve the production efficiency of optical element.

Optical glass of the invention, is well preferred with the compressing property of reheating.More specifically, optics glass of the invention Glass, even if also there is no devitrification and milky white for preferable before and after experiment (stamping die experiment) is reheated.Accordingly, due to for mould Also it is difficult to devitrification and coloring in the reheating experiment for intending the compressing processing of reheating, the light transmittance of glass is difficult to damage Lose, glass is carried out therefore, it is possible to relatively easily represent being heat-treated again for the compressing processing of reheating.That is, due to can By the complex-shaped optical element of compressing manufacture, therefore low manufacturing cost can be realized, and production efficiency is preferable Optical element manufacture.

Herein, reheating experiment (stamping die experiment) can implement by the following method, i.e. by 15mm × 15mm × 30mm Test film be placed on matrix refractory body and be put into electric furnace and reheated, be heated to above by 150 minutes from normal temperature each The temperature (falling into the temperature of refractory body) of 80 DEG C~150 DEG C of the transition temperature (Tg) of individual sample, 30 minutes are incubated in the temperature Afterwards, it is cooled to normal temperature and is fetched into outside stove, is that can internally observe and relative two sides is polished to thickness It is 10mm, then the glass specimen after polishing is visually observed.

Additionally, for reheat experiment (stamping die experiment) before and after whether there is devitrification and milky white, can be true for example, by naked eyes Recognize, " do not occur devitrification and milky white " refers to that the test film that will for example reheat after experiment (stamping die experiment) is to wavelength The transmissivity of the light (d lines) of 587.56nm substantially exists divided by the test film reheated before experiment to the value of the transmissivity of d lines More than 0.80.

Optical glass of the invention, it is usually desirable to chemical durability higher.More specifically, it is of the invention Optical glass, it is usually desirable to water resistance and acid resistance higher.Accordingly, it is processed by shot blasting to optical glass When, due to reducing the atomization of the glass that cleaning fluid and polishing fluid cause, therefore the polishing can be made more easily to carry out.

Additionally, the water resistance and acid resistance of optical glass refer to, can standard " optical glass according to the industry of Japanese Optical nitre Chemical durability assay method " JOGIS06-2008 determine chemical durability (water resistance, acid resistance), it is more satisfactory Be 1~3 grade, more preferably 1~2 grade, more preferably 1 grade.

Optical glass of the invention, it may be desirable to be difficult to devitrification when glass is manufactured.Accordingly, in manufacture glass When can suppress the reduction of transmissivity that is caused by crystallization of glass etc., therefore the optical glass can be preferably employed in Lens etc. make in the optical element of visible light-transmissive.In addition, as the mark that the complexity of devitrification occurs when representing manufacture glass Standard, for example, it is relatively low to include liquidus temperature.

[prefabricated component and optical element]

On the basis of manufactured optical glass, by using such as reheating is compressing and precise punch forming etc. The method of compression molding, it is possible to produce glass forming body.That is, it is possible to use optical glass manufacture compression molding is with advance Product, and the prefabricated component is carried out to be processed by shot blasting and manufacture glass forming body after reheating is compressing, such as it is right The prefabricated component manufactured by being processed by shot blasting carries out precise punch forming and manufactures glass forming body.Additionally, manufacture glass The method of formed body, is not limited in these methods.

So the glass forming body of manufacture, is beneficial to various optical elements, particularly, for optics such as lens or prisms The purposes of element is preferred.Accordingly, in the transmitted light of the optical system of optical element is provided with, reduce what is caused due to chromatic aberation Color fringe.Therefore, object can be more accurately shown in the case where the optical element is used for into camera, should Optical element can more clearly project required image in the case of being used for projecting apparatus.

【Embodiment】

The composition of embodiments of the invention (No.A1~No.A27, No.B1~No.B11, No.C1~No.C12) and Refractive index (n_d), Abbe number (ν_d), partial dispersion ratio (θ g, F), spectral-transmission favtor be shown as 5% and 80% wavelength (λ₅、 λ₈₀), glass transition temperature (Tg), yield point (At), the result such as institute of 1~table of table 8 of average coefficient of linear expansion (α) and proportion Show.Herein, embodiment (No.A1~No.A27) can as the embodiment of the first optical glass, embodiment (No.B1~ No.B11) can also be used as the 3rd optics glass as the embodiment of the second optical glass, embodiment (No.C1~No.C12) The embodiment of glass, but be not limited.In addition, following examples are for the purpose of example all the time, it is not limited in these implementations Example.

The glass of embodiment, selects be respectively equivalent to oxide, hydroxide, carbonate, the nitre of each component materials High-purity raw used in the common optical glass such as hydrochlorate, fluoride, hydroxide, metaphosphoric acid compound, with table After the proportion of composing of shown each embodiment is weighed and equably mixed, in input platinum crucible, and melting according to frit Melt difficulty electric furnace to be melted 3~5 hours within the temperature range of 1100 DEG C~1400 DEG C, stir and carry out froth breaking etc., 1000~1400 DEG C are dropped temperature to, is stirred, then poured into and make its Slow cooling in mould, so as to manufacture glass.

Refractive index (the n of the glass of embodiment_d), Abbe number (ν_d) and partial dispersion ratio (θ g, F), according to Japanese Optical nitre Sub- industry meeting standard JOGIS01-2003 is measured.

Also, according to the refractive index (n for being obtained_d) and Abbe number (ν_d) value, in relational expression (n_d=-a × ν_d+b) In, try to achieve intercept bs of the gradient a at 0.012.

Additionally, according to the Abbe number (ν for being obtained_d) and partial dispersion ratio (θ g, F) value, in relational expression (θ g, F=- a′×ν_d+ b ') in, try to achieve intercept bs ' of the gradient a ' at 0.00162.

Additionally, the glass for being used in this measurement, use and Slow cooling cooling rate is set to -25 DEG C/hr has been used in combination The glass that annealing furnace is processed.

The transmissivity of the glass of embodiment, is measured according to Japanese Optical nitre industry meeting standard JOGIS02.Additionally, In the present invention, by determining the transmissivity of glass, tried to achieve glass coloring whether and its degree.Specifically, to thickness The parallel polishing thing of the opposite face of 10 ± 0.1mm, the spectral-transmission favtor of 200~800nm is determined according to JISZ8722, tries to achieve λ₅ (wavelength when transmissivity is 5%) and λ₈₀(wavelength when transmissivity is 80%).

The glass transition temperature (Tg) and yield point (At) of the glass of embodiment, according to the industry meeting of Japanese Optical nitre Standard JOGIS08-2003 " assay method of the thermal expansion of optical glass ", and from the stretching, extension by temperature of the measurement and sample it Between relation and the thermal dilatometry that obtains try to achieve.

The average coefficient of linear expansion (α) of the glass of embodiment, can standard JOGIS08- according to the industry of Japanese Optical nitre 2003 " assay methods of the thermal expansion of optical glass ", average coefficient of linear expansion when having tried to achieve 100~300 DEG C.

The proportion of the glass of embodiment, according to the industry of Japanese Optical nitre can standard JOGIS05-1975 " optical glass The assay method of proportion " is measured.

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

As these are shown in Table, the optical glass of embodiment, its partial dispersion ratio (θ g, F) below 0.594, it is more specific and Say below 0.593, in required scope.Particularly, the optical glass of embodiment (No.B1~No.B11), its part Dispersion ratio (θ g, F) is below 0.590.

Herein, the optical glass of embodiments of the invention, its partial dispersion ratio (θ g, F) and Abbe number (ν_d) meet (- 0.00162 × ν_d+ 0.630)≤(θ g, F)≤(- 0.00162 × ν_d+ 0.652) relation, particularly, embodiment (No.C1 ~No.C12) optical glass, meet (θ g, F)≤(- 0.00162 × ν_d+ 0.650) relation.In addition, embodiment (No.B1 ~No.B11) optical glass meet (θ g, F)≤(- 0.00162 × ν_d+ 0.647) relation.That is, on this hair The partial dispersion ratio (θ g, F) of the glass of bright embodiment and Abbe number (ν_d) relation, as shown in Figure 2.

Therefore, it can the optical glass of clear and definite embodiments of the invention has less partial dispersion ratio (θ g, F).

The optical glass of embodiments of the invention, refractive index (n_d) more than 1.62, more specifically 1.64 with On, i.e., in required scope.Particularly, the optical glass of embodiment (No.C1~No.C12), refractive index (n_d) exist More than 1.66.

In addition, optical glass of the invention, its refractive index (n_d) below 1.75.Particularly, embodiment (No.B1~ No.B11 optical glass), its refractive index (n_d) below 1.68.

In addition, the optical glass of embodiments of the invention, Abbe number (ν_d) more than 30, and the Abbe number (ν_d) Below 42, more specifically below 41, in required scope.Particularly, embodiment (No.A1~No.A27, No.B1~No.B11) optical glass, its Abbe number (ν_d) more than 34.In addition, embodiment (No.C1~No.C12) Optical glass, its Abbe number (ν_d) below 39.

Herein, the optical glass of embodiments of the invention, its refractive index (n_d) and Abbe number (ν_d) meet (- 0.012 ν_d+2.04)≦n_d≤ (- 0.012 ν_d+ 2.16) relation, more specifically meets (- 0.012 ν_d+2.08)≦n_d≤ (- 0.012ν_d+ 2.16) relation.Particularly, the optical glass of embodiment (No.A1~No.A27), its refractive index (n_d) and Ah Shellfish number (ν_d) meet (- 0.012 ν_d+2.08)≦n_d≤ (- 0.012 ν_d+ 2.13) relation.In addition, embodiment (No.B1~ No.B11 optical glass), refractive index (n_d) and Abbe number (ν_d) meet (- 0.012 ν_d+2.08)≦n_d≤ (- 0.012 ν_d+ 2.11) relation.In addition, the optical glass of embodiment (No.C1~No.C12), refractive index (n_d) and Abbe number (ν_d) meet (- 0.012 ν_d+2.09)≦n_d≤ (- 0.012 ν_d+ 2.16) relation.Additionally, the folding of the glass on embodiments of the invention Penetrate rate (n_d) and Abbe number (ν_d) relation, as shown in Figure 3.

Therefore, it can the optical glass of clear and definite embodiment is, refractive index (n_d) and Abbe number (ν_d) in required scope It is interior, and partial dispersion ratio (θ g, F) less optical glass.

In addition, the optical glass of embodiment, λ₅(wavelength when transmissivity is 5%) in below 400nm, more specifically It is in below 350nm.Particularly, the optical glass of embodiment (No.B1~No.B11), λ₅(wavelength when transmissivity is 5%) In below 340nm.

In addition, the optical glass of embodiment, λ₈₀(wavelength when transmissivity is 80%) in below 450nm, more specifically Say it is in below 440nm.Particularly, the optical glass of embodiment (No.B1~No.B11), λ₈₀(ripple when transmissivity is 80% It is long) in below 390nm.In addition, the optical glass of embodiment (No.C1~No.C12), λ₈₀(ripple when transmissivity is 80% It is long) in below 420nm.

And hence it is also possible to the optical glass of clear and definite embodiment is higher for the transmissivity of visible ray, it is few to colour.

In addition, the optical glass of embodiment, proportion below 3.80, more specifically below 3.60, i.e., in institute It is required that in the range of.Particularly, the optical glass of embodiment (No.A1~No.A27), its proportion is in below 3.30nm.In addition, The optical glass of embodiment (No.B1~No.B11), its proportion is in below 3.00nm.

In addition, the optical glass of embodiment, its glass transition temperature below 650 DEG C, more specifically at 630 DEG C Below.Particularly, the optical glass of embodiment (No.B1~No.B11), its glass transition temperature is below 600 DEG C.In addition, The optical glass of embodiment (No.C1~No.C12), its glass transition temperature is below 550 DEG C.

In addition, the optical glass of embodiment, its yield point below 700 DEG C, i.e., in required scope.Especially It is, the optical glass of embodiment (No.B1~No.B11), its yield point is below 670 DEG C.In addition, embodiment (No.C1~ No.C12 optical glass), its yield point is below 620 DEG C.

Accordingly, can deduce can carry out compression molding to glass at lower temperatures.

In addition, the optical glass of embodiment, its average coefficient of linear expansion (α) is 150 × 10^{- 7}K^{- 1}Hereinafter, more specifically It is 140 × 10^{- 7}K^{- 1}Hereinafter, i.e., in required scope.Particularly, embodiment (No.B1~No.B11, No.C1~ No.C12 optical glass), its average coefficient of linear expansion (α) is 110 × 10^{- 7}K^{- 1}Below.

Additionally, forming lens prefabricated component in the optical glass using embodiment, and the lens prefabricated component is molded into The result of type, without there is devitrification and milky white, can be processed into various lens shapes.

More than, the present invention is illustrated for exemplary purposes, but the present embodiment is all the time only with example as mesh , it should be understood that in the case where thought of the invention and scope is not departed from, those skilled in the art can be carried out Various changes.

Claims

1. a kind of optical glass, it is characterised in that calculated with quality %,

Contain SiO₂Composition is 10.0~70.0%,

Nb₂O₅Composition is 1.0~50.0%, and,

Na₂O compositions are 1.0~30.0%,

Also, with less than more than 1.62 1.75 refractive index (n_d),

Less than more than 30 42 Abbe number (ν_d),

Less than 0.594 partial dispersion ratio (θ g, F).

2. optical glass according to claim 1, it is characterised in that calculated with quality %, B₂O₃The content of composition exists Less than 25.0%.

3. optical glass according to claim 1, it is characterised in that mass ratio (Li₂O+Na₂O)/(ZrO₂) for 0.50 with On.

4. optical glass according to claim 1, it is characterised in that calculated with quality %, Li₂The content of O compositions exists Less than 20.0%.

5. optical glass according to claim 1, it is characterised in that mass ratio (SiO₂)/(SiO₂+B₂O₃) for 0.50 with On.

6. optical glass according to claim 1, it is characterised in that mass ratio (SiO₂)/(SiO₂+B₂O₃) for 0.95 with Under.

7. optical glass according to claim 1, it is characterised in that calculated with quality %, ZrO₂The content of composition exists Less than 25.0%.

8. optical glass according to claim 1, it is characterised in that calculated with quality %,

K₂O compositions are 0~20.0%,

TiO₂Composition is 0~20.0%,

MgO compositions are 0~10.0%,

CaO compositions are 0~10.0%,

SrO compositions are 0~10.0%,

BaO compositions are 0~20.0%,

Ta₂O₅Composition is 0~10.0%,

La₂O₃Composition is 0~10.0%,

Gd₂O₃Composition is 0~10.0%,

Y₂O₃Composition is 0~20.0%,

Yb₂O₃Composition is 0~10.0%.

P₂O₅Composition is 0~10.0%,

GeO₂Composition is 0~10.0%,

Al₂O₃Composition is 0~15.0%,

Ga₂O₃Composition is 0~10.0%,

WO₃Composition is 0~10.0%,

Bi₂O₃Composition is 0~10.0%,

ZnO component is 0~30.0%,

TeO₂Composition is 0~15.0%,

SnO₂Composition is 0~5.0%,

Sb₂O₃Composition is 0~1.0%.

9. optical glass according to claim 1, it is characterised in that Rn₂The quality sum of O compositions is more than 1.0% Less than 30.0%, wherein, Rn is more than a kind selected from the group being made up of Li, Na, K.

10. optical glass according to claim 1, it is characterised in that mass ratio Li₂O/Rn₂O is more than 0.01.

11. optical glass according to claim 1, it is characterised in that the quality sum of RO compositions is less than 25.0%, its In, R is more than a kind selected from the group being made up of Mg, Ca, Sr, Ba.

12. optical glass according to claim 1, it is characterised in that Ln₂O₃The quality sum of composition is less than 20.0%, Wherein, Ln is more than a kind selected from the group being made up of Y, La, Gd, Yb.

The prefabricated component of a kind of 13. polishing use and/or precise punch forming, it is characterised in that by claim 1 to Optical glass described in 12 any one is constituted.

14. a kind of optical elements, it is characterised in that the optical glass described in any one of claim 1 to 12 is constituted.