CN102745900B

CN102745900B - Optical glass, compressing frit and optical element and manufacture method thereof

Info

Publication number: CN102745900B
Application number: CN201210115192.1A
Authority: CN
Inventors: 根岸智明
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2011-04-19
Filing date: 2012-04-18
Publication date: 2016-11-30
Anticipated expiration: 2032-04-18

Abstract

The present invention relates to optical glass, compressing frit and optical element and manufacture method thereof, a mode of the present invention relates to a kind of optical glass, represents with cation %, and it contains Si⁴⁺0～30%, B³⁺15～60%, Li⁺0～10%, Na⁺0～10%, K⁺0～15%, Mg²⁺0～20%, Ca²⁺0～15%, Sr²⁺0～20%, Ba²⁺0～20%, Zn²⁺13～40%, La³⁺0～11%, Gd³⁺0～10%, Y³⁺0～6%, Yb³⁺0～6%, Zr⁴⁺0～5%, Ti⁴⁺0～10%, Nb⁵⁺2～20%, Ta⁵⁺0～5%, W⁶⁺0～10%, Te⁴⁺0～5%, Ge⁴⁺0～5%, Bi³⁺0～5%, Al³⁺0～5%.

Description

Optical glass, compressing frit and optical element and manufacture method thereof

Technical field

The present invention relates to optical glass, the compressing frit being made up of above-mentioned optical glass and optical element, with And use the manufacture method of the optical element of above-mentioned compressing frit.

Background technology

In recent years, along with multifunction, the miniaturization of camera head, the needing of glass of high refractive index lens gradually carries High.As such lens material, it is known that the optical glass etc. disclosed in document 1,2.

Document 1: Japanese Unexamined Patent Publication 2009-120485 publication

Document 2: Japanese Unexamined Patent Publication 2006-219365 publication

Summary of the invention

But, according to the research of the present inventor, the existing high index of refraction glass headed by the optical glass described in document 1,2 The problem that glass exists following manufacture view: be not suitable for precision press molding because glass transition temperature is high；Must improve and move back Fire temperature, thus promote the consumption of annealing furnace；Liquidus temperature is high, manufacture stability lacks；Etc..

Therefore, in order to solve existing issue, it is an object of the invention to provide refractive index height and there is the manufacture of excellence Adaptive optical glass, the compressing frit being made up of above-mentioned optical glass and optical element and use above-mentioned The manufacture method of the optical element of compressing frit.

For solving the scheme of problem

Above-mentioned purpose is achieved through the following technical solutions.

[1] a kind of optical glass, represents with cation %, and it contains:

Si⁴⁺0～30%,

B³⁺15～60%,

Li⁺0～10%,

Na⁺0～10%,

K⁺0～15%,

Mg²⁺0～20%,

Ca²⁺0～15%,

Sr²⁺0～20%,

Ba²⁺0～20%,

Zn²⁺13～40%,

La³⁺0～11%,

Gd³⁺0～10%,

Y³⁺0～6%,

Yb³⁺0～6%,

Zr⁴⁺0～5%,

Ti⁴⁺0～7%,

Nb⁵⁺2～20%,

Ta⁵⁺0～5%,

W⁶⁺0～10%,

Te⁴⁺0～5%,

Ge⁴⁺0～5%,

Bi³⁺0～5%,

Al³⁺0～5%；

In this optical glass,

Si⁴⁺And B³⁺The scope that total content is 35～65%, and B³⁺The ratio (B of content and above-mentioned total content³⁺/(Si⁴⁺+ B³⁺)) it is the scope of 0.3～1,

Li⁺、Na⁺And K⁺The scope that total content is 0～20%,

Zn²⁺Content and Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺And Zn²⁺The cation ratio (Zn of total content²⁺/(Mg²⁺+Ca²⁺+Sr²⁺ +Ba²⁺+Zn²⁺)) it is the scope of 0.30～1,

La³⁺、Gd³⁺And Y³⁺The scope that total content is 0～20%,

Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺The scope that total content is 10～20%,

Ti⁴⁺Content and Ti⁴⁺And Nb⁵⁺The cation ratio (Ti of total content⁴⁺/(Ti⁴⁺+Nb⁵⁺)) it is the model of 0～0.60 Enclose,

Ti⁴⁺And W⁶⁺Total content and Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺The cation ratio ((Ti of total content⁴⁺+W⁶⁺)/(Ti⁴⁺+ Nb⁵⁺+Ta⁵⁺+W⁶⁺)) it is the scope of 0～0.70,

This optical glass is the oxide glass not containing Pb, and its refractive index nd is 1.750～1.850, and Abbe number vd is 29.0～40.0, and glass transition temperature is less than 630 DEG C.

[2] optical glass as described in [1], wherein, uses g line, F line, each refractive index ng of c line, nF, nc with (ng- NF) partial dispersion that/(nF-nc) represents is less than 0.600 than Pg, F.

[3] optical glass as described in [1] or [2], wherein, following formula the partial dispersion the obtained deviation delta than Pg, F Pg, F are less than 0.02.

Δ Pg, F=Pg, F+ (0.0018 × vd)-0.6483

[in formula, Pg, F represent use g line, F line, each refractive index ng of c line, nF, nc with (ng-nF)/(nF-nc) table The partial dispersion ratio shown, vd represents Abbe number.]

[4] optical glass as described in any one of [1]～[3], wherein, proportion is less than 4.5.

[5] optical glass as described in any one of [1]～[4], wherein, liquidus temperature is less than 1100 DEG C.

[6] optical glass as described in any one of [1]～[5], wherein, at the scope of wavelength 280～700nm, light It is below 450nm that transmitance reaches the wavelength X 70 of 70%.

[7] optical glass as described in any one of [1]～[6], wherein, at the scope of wavelength 280～700nm, light It is below 370nm that transmitance reaches the wavelength X 5 of 5%.

[8] a kind of compressing frit, it is made up of the optical glass described in any one of [1]～[7].

[9] a kind of optical element, it is made up of the optical glass described in any one of [1]～[7].

[10] manufacture method of a kind of optical element, in this manufacture method, to the compressing frit described in [8] Heat, use press-moulding die to carry out precision press molding, thus obtain optical element.

In accordance with the invention it is possible to provide, refractive index is high, glass transition temperature is low and has excellent manufacture stability Optical glass and the compressing frit and the optical element that are made up of above-mentioned optical glass and use above-mentioned being pressed into The manufacture method of the optical element of type frit.

Detailed description of the invention

[optical glass]

The optical glass of the present invention with cation % represent containing:

Si⁴⁺0～30%,

B3⁺15～60%,

Li⁺0～10%,

Na⁺0～10%,

K⁺0～15%,

Mg²⁺0～20%,

Ca²⁺0～15%,

Sr²⁺0～20%,

Ba²⁺0～20%,

Zn²⁺13～40%,

La³⁺0～11%,

Gd³⁺0～10%,

Y³⁺0～6%,

Yb³⁺0～6%,

Zr⁴⁺0～5%,

Ti⁴⁺0～7%,

Nb⁵⁺2～20%,

Ta⁵⁺0～5%,

W⁶⁺0～10%,

Te⁴⁺0～5%,

Ge⁴⁺0～5%,

Bi³⁺0～5%,

Al³⁺0～5%；

In this optical glass,

Li⁺、Na⁺And K⁺The scope that total content is 0～20%,

La³⁺、Gd³⁺And Y³⁺The scope that total content is 0～20%,

This optical glass is the oxide glass not containing Pb, and its refractive index nd is 1.750～1.850, and Abbe number vd is 29～40, and glass transition temperature is less than 630 DEG C.

Hereinafter, the optical glass of the present invention is described in detail.Hereinafter, unless otherwise specified, otherwise " % " Referring to " cation % ", " cation % " refers to the mole percent of cation constituent.

Glass forms

The optical glass of the present invention is oxide glass, and Main Anions composition is O^2-。O^2-Content be preferably 95 the moon from More than sub-more than %, more preferably 98 aniones %, more preferably more than 99 aniones %, particularly preferably 100 the moon from Sub-%.Wherein, " anion % " refers to the mole percent of anion component.

It follows that cation constituent is illustrated.

Si⁴⁺The effect have the viscosity improving glass, improving the stability of glass, has given play to the work improving glass mouldability With.But, if importing more than 30%, then refractive index reduces, and glass transition temperature rises, precision press molding and meltability Deteriorate.Therefore, Si⁴⁺Content be 0～30%.

Si⁴⁺The preferred upper limit of content be 20%, the preferred upper limit be 15%, the further preferred upper limit be 10%, the upper limit more preferably be 9%, the further preferably upper limit be 8%.Si⁴⁺The preferred lower limit of content be 1%, Preferred lower limit is 2.0%, further preferred lower limit is 3%, lower limit more preferably is 4%, the most preferred Lower limit is 5%.

B³⁺There is the effect also reducing liquidus temperature while improving the stability of glass, and be that there is raising glass The composition of the effect of mouldability.But, if B³⁺Content less than 15%, then refractive index rises, but the stability of glass reduces, liquid Phase temperature rises, thus manufactures stability and reduce.And if import more than 60%, then refractive index reduces.Therefore, B³⁺Content be 15～60%.

B³⁺The preferred upper limit of content be 55%, the preferred upper limit be 50%, the further preferred upper limit be 48%, The upper limit more preferably is 47%, the further preferably upper limit is 45%, B³⁺The preferred lower limit of content be 20%, more excellent The lower limit of choosing is 25%, further preferred lower limit is 30%, lower limit more preferably is 35%, further preferred lower limit It is 38%.

Si⁴⁺、B³⁺It is the mesh forming component of glass, Si⁴⁺And B³⁺Total content less than 35% time, refractive index rise, but The minimizing of Abbe number can occur, the stability of glass reduces, the rising of liquidus temperature.On the other hand, if Si⁴⁺And B³⁺Always contain Amount is more than 65%, then refractive index reduces, and Abbe number increases.Therefore, Si⁴⁺And B³⁺Total content be 35～65%.

Si⁴⁺And B³⁺The preferred upper limit of total content be 60%, the preferred upper limit be 58%, further preferred upper Be limited to 56%, the upper limit more preferably be 54%, the further preferably upper limit be 53%.Si⁴⁺And B³⁺Total content preferred Lower limit be 38%, preferred lower limit be 40%, further preferred lower limit be 42%, lower limit more preferably be 44%, Further preferably lower limit is 46%.

Si⁴⁺And B³⁺Total content as it has been described above, but B³⁺The cation ratio (B of content and this total content³⁺/(Si⁴⁺+B³⁺)) During less than 0.3, refractive index reduces, and liquidus temperature rises, thus cation ratio (B³⁺/(Si⁴⁺+B³⁺)) it is 0.3～1.

From the aspect of the stability improving glass, cation ratio (B³⁺/(Si⁴⁺+B³⁺)) the upper limit be preferably 0.99, More preferably 0.97, more preferably 0.95, more preferably 0.93, further preferably 0.90.Cation ratio (B³⁺/ (Si⁴⁺+B³⁺)) preferred lower limit be 0.40, preferred lower limit be 0.50, further preferred lower limit be 0.60, more excellent The lower limit of choosing is 0.70, further preferably lower limit is 0.80.

Li⁺It is that to reduce the effect of glass transition temperature strong and also have the composition of the effect improving meltability.But It is, if Li⁺Content more than 10%, then refractive index, stability, glass all reduce.Therefore, Li⁺Content be 0～10%.Li⁺'s Content preferably in the range of 0～8%, more preferably in the range of 0～6%, further preferred range be 0～4%, more enter one Step is preferably in the range of 0～2%.

Na⁺Also it is that to reduce the effect of glass transition temperature strong and also have the composition of the effect improving meltability.But It is, if Na⁺Content more than 10%, then refractive index, stability, glass all reduce.Therefore, Na⁺Content be 0～10%.Na⁺'s Content preferably in the range of 0～8%, more preferably in the range of 0～6%, further preferred range be 0～4%, more enter one Step is preferably in the range of 0～2%.

K⁺Also it is that to reduce the effect of glass transition temperature strong and also have the composition of the effect improving meltability.But It is, if K⁺Content more than 15%, then refractive index, stability, glass all reduce.Therefore, K⁺Content be 0～15%.K⁺Contain Amount preferably in the range of 0～10%, more preferably in the range of 0～8%, further preferred range be 0～6%, more enter one Step preferably in the range of 0～4%, further in the range of 0～2%.

Li⁺、Na⁺And K⁺If content as it has been described above, but Li⁺、Na⁺And K⁺Total content more than 20%, then refractive index, glass Stability all reduces.Therefore, Li⁺、Na⁺And K⁺Total content be 0～20%.Li⁺、Na⁺And K⁺The preferred upper limit of total content Be 15%, the preferred upper limit be 10%, the further preferred upper limit be 6%, the upper limit more preferably be 4%, further The preferably upper limit is 2%.Li⁺、Na⁺And K⁺The preferred lower limit of total content be 0.1%, preferred lower limit is 0.5%, enters The one preferred lower limit of step is 1.0%.

Mg²⁺It is the effect having and improving meltbility and also there is the composition dropping low-gravity effect.But, if Mg²⁺ Content more than 20%, then Abbe number increases, and the stability of glass reduces, and liquidus temperature rises.Therefore, Mg²⁺Content be 0～ 20%.Mg²⁺Content preferably in the range of 0～15%, more preferably in the range of 0～10%, further preferred range be 0 ～8%, more preferably in the range of 0～6%, the most preferably do not contain Mg²⁺。

Ca²⁺It is the effect having and improving meltbility and also there is the composition making glass be low-gravity effect.But, If Ca²⁺Content more than 15%, then Abbe number increases, and the stability of glass reduces, and liquidus temperature rises.Therefore, Ca²⁺Contain Amount is 0～15%.Ca²⁺The preferred upper limit of content be 12%, the preferred upper limit be 10%, the further preferred upper limit be 8%, the upper limit more preferably be 6%, the further preferably upper limit be 4%.Ca²⁺The preferred lower limit of content be 0.5%, Preferred lower limit is 1%, further preferred lower limit is 2%.

Sr²⁺It it is the composition of the effect having and improving meltbility and also the effect with the stability improving glass.But It is, if Sr²⁺Content more than 20%, then Abbe number increases, and the stability of glass reduces.Therefore, Sr²⁺Content be 0～ 20%.Sr²⁺Content preferably in the range of 0～15%, more preferably in the range of 0～10%, further preferred range be 0 ～8%, more preferably in the range of 0～6%, the most preferably do not contain Sr²⁺。

Ba²⁺It it is the composition of the effect with the stability improving meltbility or raising glass.But, if Ba²⁺Content More than 20%, then Abbe number increases, and the stability of glass reduces, and proportion increases.Therefore, Ba²⁺Content be 0～20%.Ba²⁺ The preferred upper limit of content be 15%, the preferred upper limit be 10%, the further preferred upper limit be 8%, more preferably The upper limit is 6%, further the upper limit be 5%.Ba²⁺The preferred lower limit of content be 0.5%, preferred lower limit be 1%, Further preferred lower limit is 2%, lower limit more preferably is 3%.

Zn²⁺Playing the effect reducing glass transition temperature while maintaining high index of refraction, it still improves meltbility Composition.But, if Zn²⁺Content less than 13%, then glass transition temperature rises.It addition, refractive index reduces, Abbe number increases Greatly, so that a large amount of containing has the Ti improving refractive index, reducing the effect of Abbe number⁴⁺、Nb⁵⁺、Ta⁵⁺、W⁶⁺。Ti⁴⁺、Nb⁵⁺、 Ta⁵⁺、W⁶⁺It is the composition improving refractive index, but is also to increase index i.e. Δ Pg, the F value of partial dispersion characteristic described later or make essence The composition that close compressing property deteriorates.Therefore, if Zn content is less than 13%, Δ Pg the most indirectly, F value increases, and precision is pressed into Type also deteriorates.On the other hand, if Zn²⁺Content more than 40%, then glass stability deteriorate.Therefore, Zn²⁺Content be 13～40%.Zn²⁺The preferred upper limit of content be 35%, the preferred upper limit be 30%, the further preferred upper limit be 28%, the upper limit more preferably be 25%, the further preferably upper limit be 23%.Zn²⁺The preferred lower limit of content be 14%, preferred lower limit be 15%, further preferred lower limit be 16%, lower limit more preferably be 18%.

Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺And Zn²⁺Content as it has been described above, but Zn²⁺Content and Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺With Zn²⁺The cation ratio (Zn of total content²⁺/(Mg²⁺+Ca²⁺+Sr²⁺+Ba²⁺+Zn²⁺)) less than 0.30 time, Abbe number increase, glass Stability reduce, liquidus temperature rise.Therefore, cation ratio (Zn²⁺/(Mg²⁺+Ca²⁺+Sr²⁺+Ba²⁺+Zn²⁺)) be 0.30～ 1.Cation ratio (Zn²⁺/(Mg²⁺+Ca²⁺+Sr²⁺+Ba²⁺+Zn²⁺)) the preferred upper limit be 0.98, the preferred upper limit be 0.95, The further preferred upper limit is 0.90, the upper limit more preferably is 0.85, the further preferably upper limit is 0.80.From improving glass The stability of glass, the aspect of reduction liquidus temperature are set out, cation ratio (Zn²⁺/(Mg²⁺+Ca²⁺+Sr²⁺+Ba²⁺+Zn²⁺)) preferred Lower limit be 0.40, preferred lower limit be 0.50, further preferred lower limit be 0.60, lower limit more preferably be 0.65, Further preferably lower limit is 0.70.

La³⁺Be improve glass stability, do not increase Δ Pg, F value and improve the composition of refractive index.But, if La³⁺'s Content is more than 11%, then refractive index and Abbe number increase, and the stability of glass reduces, liquidus temperature, proportion and glass transition Temperature rises.Therefore, La³⁺Content be 0～11%.La³⁺The preferred upper limit is 10%, the preferred upper limit is 9%, enters one Walk the preferred upper limit be 8%, further the upper limit be 7%, the upper limit more preferably be 6%.La³⁺Content preferred under Be limited to 0.5%, preferred lower limit be 1%, further preferred lower limit be 2%, lower limit more preferably be 3%.

Gd³⁺Not increase Δ Pg, F value and improve the composition of refractive index.But, if Gd³⁺Content more than 10%, then roll over Penetrating rate and Abbe number increases, the stability of glass reduces, and liquidus temperature, proportion and glass transition temperature rise.Therefore, Gd³⁺ Content be 0～10%.Gd³⁺Content preferably in the range of 0～8%, more preferably in the range of 0～6%, further preferably In the range of 0～4%, more preferably in the range of 0～2%, the most preferably do not contain Gd³⁺。

Y³⁺Not increase Δ Pg, F value and improve the composition of refractive index.But, if Y³⁺Content more than 6%, then refractive index Increasing with Abbe number, the stability of glass reduces, and liquidus temperature, proportion and glass transition temperature rise.Therefore, Y³⁺Content It is 0～6%.Y³⁺Content preferably in the range of 0～4%, more preferably in the range of 0～3%, further preferably do not contain Y³ ⁺。

La³⁺、Gd³⁺And Y³⁺Content as it has been described above, the refractive index needed for realizing and Abbe number, the stablizing of maintenance glass Property, the suppression rising of liquidus temperature, the increase of proportion, the aspect of rising of glass transition temperature set out, La³⁺、Gd³⁺And Y³⁺ Total content be 0～20%.La³⁺、Gd³⁺And Y³⁺The preferred upper limit of total content be 12%, the preferred upper limit be 10%, The further preferred upper limit is 9%, the upper limit more preferably is 8%, further preferably the upper limit be 7%, further The upper limit is 6%, La³⁺、Gd³⁺And Y³⁺The preferred lower limit of total content be 0.5%, preferred lower limit be 1%, the most excellent The lower limit of choosing is 2%, lower limit more preferably is 3%.

Yb³⁺Not increase Δ Pg, F value and improve the composition of refractive index.But, if Yb³⁺Content more than 6%, then reflect Rate and Abbe number increase, and the stability of glass reduces, and liquidus temperature, proportion and glass transition temperature rise.Therefore, Yb³⁺'s Content is 0～6%.Yb³⁺Content preferably in the range of 0～4%, more preferably in the range of 0～3%, the most not Containing Yb³⁺。

Zr⁴⁺It it is the composition playing the effect improving refractive index.But, if Zr⁴⁺Content more than 5%, then the stablizing of glass Property reduce, liquidus temperature rise.Therefore, Zr⁴⁺Content be 0～5%.Zr⁴⁺The preferred upper limit be 4%, the preferred upper limit Be 3%, the further preferred upper limit be 2%, the upper limit more preferably be 1%.Zr⁴⁺The preferred lower limit of content be 0.5%.

Ti⁴⁺It is to improve refractive index and reduce the composition of Abbe number.But, if Ti⁴⁺Content more than 7%, then refractive index increase Adding, Abbe number reduces, and Δ Pg, F value increases, and the stability of glass reduces, and precision press molding deteriorates.It addition, also can produce The coloring of glass.Therefore, Ti⁴⁺Content be 0～7%.Ti⁴⁺The preferred upper limit be 6%, the preferred upper limit is 5%, enters The one preferred upper limit of step is 4%.Ti⁴⁺The preferred lower limit of content be 0.5%, preferred lower limit be 1%, further preferably Lower limit be 2%.

Nb⁵⁺It is to play improve refractive index and reduce the composition of effect of Abbe number, has and compare Ti⁴⁺Or W⁶⁺More can reduce Δ The effect of Pg, F value.But, if Nb⁵⁺Content less than 2%, then be difficult to meet required optical characteristics, the increase of Δ Pg, F value, glass The stability of glass reduces, and liquidus temperature rises.On the other hand, if Nb⁵⁺Content more than 20%, then refractive index increase, Abbe number Reducing, the stability of glass reduces, and liquidus temperature rises.Therefore, Nb⁵⁺Content be 2～20%.Nb⁵⁺The preferred upper limit be 18%, the preferred upper limit be 16%, the further preferred upper limit be 14%, the upper limit more preferably be 13%, further The preferably upper limit is 12%.Nb⁵⁺The preferred lower limit of content be 4%, preferred lower limit be 5%, further preferred under Be limited to 6%, lower limit more preferably be 8%, further preferably lower limit be 9%, further lower limit be 10%.

Ta⁵⁺It is the composition improving refractive index, with the composition Ti of same raising refractive index⁴⁺、Nb⁵⁺、W⁶⁺Compare and demonstrate low color Dissipate property.It addition, and Ti⁴⁺、W⁶⁺Compare to have and reduce Δ Pg, the effect of F value further.But, if Ta⁵⁺Content more than 5%, Then refractive index increases, and the stability of glass reduces, and liquidus temperature and proportion rise.Therefore, Ta⁵⁺Content be 0～5%.Ta⁵⁺ Content preferably in the range of 0～4%, more preferably in the range of 0～3%, further preferably do not contain Ta⁵⁺。

W⁶⁺It is to improve refractive index and reduce the composition of Abbe number.But, if W⁶⁺Content more than 10%, then refractive index, Δ Pg, F value and proportion increase, and Abbe number reduces, and the stability of glass reduces, and precision press molding deteriorates.It addition, also can produce The coloring of glass.Therefore, W⁶⁺Content be 0～10%.W⁶⁺Content preferably in the range of 0～8%, preferred scope Be 0～6%, further preferred range be 0～4%, more preferably in the range of 0～3%, the most preferably do not contain W⁶ ⁺。

As it has been described above, Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺It is to improve refractive index and reduce the composition of Abbe number.But, if Ti⁴⁺、 Nb⁵⁺、Ta⁵⁺And W⁶⁺Total content less than 10%, then be difficult to make the glass meeting required optical characteristics, if above-mentioned total content More than 20%, then refractive index increases, and Abbe number reduces, and Δ Pg, F value increases, and the stability of glass reduces, and liquidus temperature rises. It addition, the coloring of glass also can be produced.Therefore, Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺Total content be 10～20%.Ti⁴⁺、Nb⁵⁺、Ta⁵⁺ And W⁶⁺The preferred upper limit of total content be 19%, the preferred upper limit be 18%, the further preferred upper limit be 17%, more The preferred upper limit is 16%, the further preferably upper limit is 15%.Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺Total content preferred under Be limited to 11%, preferred lower limit is 12%.

If Ti⁴⁺Content and Ti⁴⁺And Nb⁵⁺The cation ratio (Ti of total content⁴⁺/(Ti⁴⁺+Nb⁵⁺)) more than 0.60, then glass The stability of glass reduces, and liquidus temperature rises, and Δ Pg, F value increases, and precision press molding reduces.Therefore, cation ratio (Ti⁴ ⁺/(Ti⁴⁺+Nb⁵⁺)) it is 0～0.60.Cation ratio (Ti⁴⁺/(Ti⁴⁺+Nb⁵⁺)) the preferred upper limit be 0.55, the preferred upper limit Be 0.51, the further preferred upper limit be 0.45, the upper limit more preferably be 0.40, further preferably the upper limit be 0.30, Further the upper limit is less than 0.20.From maintaining the stability of glass, the aspect of rising of suppression liquidus temperature, sun from Son compares Ti⁴⁺/(Ti⁴⁺+Nb⁵⁺) preferred lower limit be 0.02, preferred lower limit be 0.05, further preferred lower limit be 0.08, lower limit more preferably be 0.10, further preferably lower limit be 0.12.

If Ti⁴⁺And W⁶⁺Total content and Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺The cation ratio ((Ti of total content⁴⁺+W⁶⁺)/(Ti⁴⁺ +Nb⁵⁺+Ta⁵⁺+W⁶⁺)) more than 0.70, then Δ Pg, F value increases, the stability of glass reduces simultaneously, and liquidus temperature rises, glass Coloring, precision press molding reduces.Therefore, cation ratio ((Ti⁴⁺+W⁶⁺)/(Ti⁴⁺+Nb⁵⁺+Ta⁵⁺+W⁶⁺)) it is 0～0.70. Cation ratio ((Ti⁴⁺+W⁶⁺)/(Ti⁴⁺+Nb⁵⁺+Ta⁵⁺+W⁶⁺)) the preferred upper limit be 0.60, the preferred upper limit is 0.50, enters The one preferred upper limit of step is 0.40, the upper limit more preferably is 0.30, the further preferably upper limit is 0.20.It addition, from dimension The aspect of the rising holding the stability of glass, suppression liquidus temperature is set out, cation ratio ((Ti⁴⁺+W⁶⁺)/(Ti⁴⁺+Nb⁵⁺+Ta⁵⁺+ W⁶⁺)) preferred lower limit be 0.02, preferred lower limit be 0.05, further preferred lower limit be 0.08, more preferably under Be limited to 0.10, further preferably lower limit is 0.12.

Te⁴⁺It is the composition of the effect playing the stability improving glass while improving refractive index, if but Te⁴⁺Contain Amount is more than 5%, then the stability of glass reduces.Therefore, Te⁴⁺Content be 0～5%.Te⁴⁺Content preferably in the range of 0 ～4%, more preferably in the range of 0～3%.From the aspect considering environmental pressure, it is desirable to cut down Te⁴⁺Consumption, thus enter One step does not preferably contain Te⁴⁺。

Ge⁴⁺It is the composition of the effect playing the stability improving glass while improving refractive index, if but its content is super Cross 5%, then the stability of glass reduces.Therefore, Ge⁴⁺Content be 0～5%.Ge⁴⁺In as the material of glass ingredient it is Much more expensive composition, therefore from the standpoint of suppression manufacturing cost increases, it is desirable to reduce its consumption.Therefore, Ge⁴⁺Content Preferably in the range of 0～4%, more preferably in the range of 0～3%, further preferably do not contain Ge⁴⁺。

Bi³⁺It is the composition of the effect playing the stability improving glass while improving refractive index, if but its content is super Cross 5%, then the stability of glass reduces, and demonstrates the tendency of glass coloration simultaneously.It addition, precision press molding also deteriorates. Therefore, Bi³⁺Content be 0～5%.Bi³⁺Content preferably in the range of 0～4%, more preferably in the range of 0～3%, enter One step does not preferably contain Bi³⁺。

Al³⁺It is the composition playing the effect improving the stability of glass, chemical durability, if but containing having more than 5%, then roll over Rate of penetrating reduces, and demonstrates the tendency that the stability of glass reduces simultaneously.Therefore, Al³⁺Content be 0～5%.Al³⁺Content Preferably in the range of 0～4%, more preferably in the range of 0～3%, further preferably do not contain Al³⁺。

The optical glass of the present invention can add together with mentioned component Sb, Sn etc. as clarifier.In the case of Gai, The addition of Sb is converted into Sb₂O₃, by be preferably based on the ratio of total amount (cutting outward り) 0～1 mass %, more preferably 0～ 0.5 mass %, the addition of Sn is converted into SnO₂, to be preferably 0～1 mass %, more based on the ratio of total amount (cutting outward り) It is preferably 0～0.5 mass %.

The glass of the present invention is optical glass, it is desirable to coloring is few.It is therefore preferable that do not contain make the V of glass coloration, Cr, Mn, Cu、Ni、Fe、Pr、Nd、Eu、Tb、Ho、Er.It addition, from alleviating the aspect of the load to environment, make the glass not containing Pb Glass.From alleviating the aspect of the load to environment further, do not contain Cd, Th, U, Tl, Se, As the most yet.

Ga can be contained on a small quantity³⁺、Lu³⁺、In³⁺、H⁴⁺, but these compositions can't bring meaningful effect, and these Composition is the most costly, thus preferably makes its content be respectively 0～the scope of 2%, more preferably 0～the scope of 1%, the most excellent Elect as 0% less than 0.5% scope, be more preferably the scope that 0% less than 0.1%, from suppression glass The aspect of production cost is set out, and does not the most preferably contain these compositions.

Refer to add not as glass ingredient it should be noted that the present invention " does not contains ", but be not precluded from impurity etc. The material of the level being inevitably mixed in glass.

Refractive index, Abbe number

Refractive index nd of the optical glass of the present invention is 1.750～1.850.By making refractive index nd be more than 1.750, energy The optical glass enough using the present invention provides the high function of composition and the optical element of small-sized optical system.But, roll at height In the case of penetrating rate glass, if improving refractive index, then liquidus temperature and glass transition temperature demonstrate rising trend, manufacture suitable Answering property reduces.Therefore, the upper limit of refractive index nd is set to 1.850 by the present invention, to maintain the manufacture stability of glass, molding Property.From the aspect of the increase of suppression proportion, it is also effective that refractive index nd is set to less than 1.850.

The upper limit of refractive index nd is preferably 1.840, more preferably 1.830, more preferably 1.825, be more preferably 1.820,1.815 further it are preferably, much further preferably from 1.810.

The lower limit of refractive index nd is preferably 1.760, more preferably 1.770, more preferably 1.780, be more preferably 1.790,1.795 further it are preferably, much further preferably from 1.800.

The optical glass of the present invention, while having the refractive index of above-mentioned scope, also has the scope of 29.0～40.0 Abbe number vd.By make Abbe number vd in above-mentioned scope, can by with the optical element combination being made up of multiple optical glass And obtain good chromatic aberration correction.

The upper limit of Abbe number vd is preferably 38.0, more preferably 37.0, more preferably 36.0, be more preferably 35.0,34.5 further it are preferably, much further preferably from 34.0.

The lower limit of Abbe number vd is preferably 30.0, more preferably 31.0, more preferably 31.5, be more preferably 32.0,32.5 further it are preferably, much further preferably from 33.0.

Glass transition temperature

The glass transition temperature of the optical glass of the present invention is less than 630 DEG C.Glass transition temperature is utilized to be less than 630 DEG C The optical glass of the present invention, the temperature of glass when suppressing compressing and the rising of the temperature of press-moulding die, thus Good compressing property can be obtained.

The optical glass of the present invention contains Nb⁵⁺As neccessary composition, containing Ti⁴⁺、Ta⁵⁺And W⁶⁺As optional member.These Composition forming surface with press-moulding die when compressing is reacted, and can reduce the quality on the surface of compressing product, or Promote the deterioration of forming surface.This phenomenon should be avoided especially in precision press molding.Above-mentioned reaction is compressed into Glass during type and the considerable influence of the temperature of press-moulding die, thereby through reducing compressing temperature, it is possible in suppression State reaction.Therefore, the basis that the temperature of press-moulding die can be suppressed to rise by making glass transition temperature be less than 630 DEG C The optical glass of invention is suitable for precision press molding.It addition, utilize the light of the present invention that glass transition temperature is less than 630 DEG C Learn glass, additionally it is possible to reduce annealing temperature, additionally it is possible to the suppression deterioration of annealing furnace, consumption.

The preferred upper limit of the glass transition temperature of the optical glass of the present invention is 610 DEG C, the preferred upper limit is 600 DEG C, the further preferred upper limit be 590 DEG C, the upper limit more preferably be 580 DEG C, the further preferably upper limit be 570 DEG C.Separately Outward, if excessively reducing glass transition temperature, then refractive index reduces, or the stability of glass demonstrates deterioration tendency, thus Glass transition temperature be preferably more than 500 DEG C, more preferably more than 520 DEG C, more preferably more than 530 DEG C, more excellent Elect more than 540 DEG C as, be further preferably more than 550 DEG C.

Partial dispersion

In image pickup optical system, projection optics system etc., for carrying out high order chromatic aberration correction, by by the optics glass of the present invention The lens that glass is constituted are combined being effective with the lens being made up of the glass that dispersion is low.But, the glass of low dispersion side Partial dispersion is relatively bigger than many, therefore in the case of the aberration correcting more high order, with this of low dispersion lens combination Bright optical glass is required that partial dispersion ratio is little.

About partial dispersion than Pg, F, use g line, F line, each refractive index ng of c line, nF, nc with (ng-nF)/(nF- Nc) represent.

In the optical glass of the present invention, from providing the aspect of glass being suitable for high order chromatic aberration correction, partial dispersion Ratio Pg, F are preferably less than 0.600.Pg, F be more preferably less than 0.598, more preferably less than 0.596, be more preferably Less than 0.594, less than 0.592 further it is preferably, much further preferably from less than 0.590.

Wherein, if excessively minimizing partial dispersion is than Pg, F, then other characteristics demonstrate the tendency deviateing preferred scope.Cause This, partial dispersion is preferably more than 0.570 than Pg, F.The partial dispersion preferred lower limit than Pg, F is 0.575, the most excellent The lower limit of choosing is 0.580, lower limit more preferably is 0.582, further preferably lower limit be 0.584, further under It is limited to 0.586.

It should be noted that in partial dispersion than in Pg, F-Abbe number vd figure, if as the base of normal segments dispersive glass Partial dispersion on reference of reference line (normal line) represents than with Pg, F (0), then Pg, F (0) use below Abbe number vd Formula represents.

Pg, F (0)=0.6483-(0.0018 × vd)

Δ Pg, F are the partial dispersion of the deviation said reference line deviation than Pg, F, represent with following formula.

Δ Pg, F=Pg, F-Pg, F (0)

=Pg, F+ (0.0018 × vd)-0.6483

For the optimal way in the optical glass of the present invention, its deviation delta Pg, F is less than 0.02, as high order aberration The optical element material of correction is suitable.Δ Pg in the present invention, F preferably in the range of less than 0.015, preferred model To enclose be less than 0.01, further preferred range is less than 0.008, more preferably in the range of less than 0.006, the most excellent Choosing is in the range of less than 0.005.

Proportion

The optical glass of the present invention is the glass of high refractive index of refractive index nd with 1.750～1.850 scopes, if generally Glass high index of refraction, then proportion demonstrates increase tendency.But, the increase of proportion can cause the weight of optical element to increase, Thus it is the most preferred.On the other hand, the optical glass of the present invention have above-mentioned glass composition, although thus be glass of high refractive index, But can make proportion is less than 4.5.In the optical glass of the present invention, the preferred upper limit of proportion is 4.4, the preferred upper limit is 4.3, the further preferred upper limit be 42, the upper limit more preferably be 4.1.On the other hand, if excessively reducing proportion, then demonstrate The tendency that the stability of glass reduces, liquidus temperature rises, therefore proportion preferably more than 3.5, more preferably more than 3.6, enter One step is preferably more than 3.7, is more preferably more than 3.8, further preferably more than 3.9.

Liquidus temperature

The optical glass of the present invention has above-mentioned glass composition such that it is able to demonstrate the liquidus temperature less than 1100 DEG C. Thereby, it is possible to the rising of the outflow temperature of suppression melting temperature and glass melts, it is possible to while high index of refraction, take into account height Homogeneity and the suppression of coloring.

In the present invention, liquidus temperature be preferably less than 1090 DEG C, more preferably less than 1070 DEG C, more preferably 1050 Below DEG C, it is more preferably less than 1040 DEG C, further preferably less than 1030 DEG C.

On the other hand, if excessively reducing liquidus temperature, then it is difficult to obtain required refractive index, Abbe number.Further, part color Dissipating ratio Pg, F value rises.Therefore, liquidus temperature be preferably more than 950 DEG C, more preferably more than 970 DEG C, more preferably 980 More than DEG C, it is more preferably more than 990 DEG C, further preferably more than 1000 DEG C.

Coloring (λ 70, λ 5)

The optical glass of the present invention forms by having above-mentioned glass, it is possible to reduces or suppress to colour, it is possible to can See that the wide scope in light region demonstrates high light transmittance.Index as the coloring of optical glass, it is possible to use at wavelength 280～ The wavelength X that scope light penetration is 70% 70 of 700nm and the wavelength X 5 that this light penetration is 5%.Herein, light is saturating The rate of mistake refers to, uses and grinds to form the thickness of 10.0+0.1mm and have the glass specimen in the face being parallel to each other, from above-mentioned grinding The vertical direction incident illumination in face and the spectral transmission that obtains, i.e. the intensity inciding the light of said sample is set to Iin, general It is set to Iout/Iin during Iout through the intensity of the light of said sample.Spectral transmission also comprises the reflection of the light of specimen surface Loss.It addition, above-mentioned grinding refers to, being smoothed the wavelength turning to surface roughness relative to measuring wave band is the least shape State.About λ 70, the optical glass of the present invention can show which the λ 70 of below 450nm.The λ 70 of the optical glass of the present invention is preferably Below 440nm, more preferably below 430nm, more preferably below 420nm, it is more preferably below 410nm, more enters one Step is preferably below 400nm.But, if λ 70 becomes too low, then it is difficult to meet required optical characteristics, or shows sometimes Go out the tendency that stability reduces, liquidus temperature rises of glass, thus λ 70 be preferably more than 350nm, more preferably 360nm with Upper, more preferably more than 370nm, be more preferably more than 380nm, be further preferably more than 390nm.

It addition, the λ 5 of the optical glass of the present invention preferably in the range of below 370nm, more preferably in the range of 365nm, Further preferred range be below 360nm, more preferably in the range of below 355nm, the most preferably in the range of Below 350nm.

So, although the optical glass of the present invention is glass of high refractive index, but demonstrate the light permeability of excellence, be suitable for It is used as to constitute the material of the optical element of image pickup optical system, projection optics system.

The manufacture method of optical glass

The optical glass of the present invention can be manufactured by fusion method.In fusion method, in order to obtain desired composition and light Learn the glass of characteristic, weigh as the oxide of raw material, various salt and be sufficiently mixed, making Blend Stocks, Blend Stocks is added Heat, melted, and by limpid for obtained fused mass, homogenize after make it flow out, obtain the one-tenth being made up of the optical glass of homogenizing Type body.Or, Blend Stocks is put in crucible and slightly melts, by base glass, make cullet material.And then, for Obtain the optical glass of desired optical characteristics, it is also possible to the cullet material that is in harmonious proportion also heats, melted, by obtained molten Melt that thing is limpid, homogenize after make it flow out, obtain the molded body being made up of the optical glass of homogenizing.

[compressing frit]

The compressing frit (hereinafter referred to as frit) of the present invention is made up of the optical glass of the invention described above.

For frit, first, by the frit heating concocted to obtain the optical glass of the present invention, melted, Molding.The glass forming body so made is processed, the frit suitable with the amount of compressing product can be made.

As an example, melten glass is cast in mould, is shaped to tabular or bulk, carry out machining after annealing i.e. Cut-out, grinding, grinding, such that it is able to obtain frit.

Or, it is also possible to from pipe, flow out melten glass stream, isolate from the front end of melten glass stream and be pressed into one The fused glass block that the amount of type product is suitable, is shaped to frit by this fused glass block on mould.In this case, may be used With on mould to above-mentioned glass blocks apply blast and at the state compacted under making it float as frit, it is also possible to right After fused glass block on mould is pressed, the cooling when applying blast and make it float, thus make Make frit.

[optical element and manufacture method thereof]

The optical element of the present invention is made up of the optical glass of the invention described above.

As the concrete example of the optical element of the present invention, non-spherical lens, spherical lens or plano-concave can be exemplified saturating Lens, lenticule, the lens arrays such as mirror, planoconvex lens, biconcave lens, biconvex lens, male bend moon-shaped lens, recessed meniscus lens Row, various lens, prism, the prism etc. of band lens function such as lens of band diffraction grating.Can also set on surface as required Put antireflection film or there is the partially reflective film etc. of wavelength selectivity.

The optical element of the present invention can take into account high index of refraction and lower part dispersion ratio, therefore by with by other glass structures The optical element combination become, it is possible to carry out good chromatic aberration correction.Further, since the optical glass of the present invention can take into account high folding Penetrate rate and low-gravity, be capable of the lightweight of optical element hence with the optical glass of the present invention.The optics unit of the present invention Part is also adapted to the camera optical system of the various photographing units such as digital camera, digital camera, supervision photographing unit, onboard camera System, guiding are picked up for the optical recording medias such as DVD, CD being write or read the optical element of the light of data, such as light Lens, collimating lens etc..It addition, be also suitable as the optical element of fiber optic communication.

The manufacture method of the optical element of the present invention is that the compressing frit to the invention described above heats also Precision press molding, thus obtain optical element.Here, it is known that precision press molding is also known as mold optical molding, The method referring to form the optical function face of optical element by transferring the forming surface of press-moulding die.Need explanation Be, optical function face refers to make the light of control object reflect in optical element, reflects, diffraction, the face of incidence/outgoing, thoroughly Lens faces in mirror etc. are equivalent to this optical function face.Low and there is the accurate pressure of excellence owing to employing glass transition temperature The frit that the optical glass of the present invention of mouldability processed is constituted, therefore, it is possible to the known precision press molding method of application is with Gao Sheng Productivity manufactures the optical element of high-quality.

It should be noted that the optical element of the present invention can also utilize the method beyond precision press molding method to make, Such as frit heated, soften, compressing, obtain having and add grinding allowance, grinding in shape at optical element The optical element blank of the shape of surplus, and this optical element blank is carried out grinding, grinding, thus make the optics of the present invention Element；Or, the glass forming body being made up of the optical glass of the present invention is carried out grinding, grinding, makes the optics of the present invention Element.

Embodiment

Hereinafter, the present invention is illustrated in greater detail by embodiment.

1. the making of optical glass

In order to obtain the glass composition shown in table 1, as the raw material for importing each composition, weigh the most corresponding with them Oxide, carbonate, sulfate, nitrate, hydroxide etc. being sufficiently mixed, make Blend Stocks, add it to platinum In crucible, heat at 1200～1350 DEG C, melt, limpid, homogenize 1～3 hour.Obtained melten glass is cast to In the mould of carbon, naturally cool to the transition temperature of glass, put into annealing furnace immediately after, in the transformetion range of glass After making annealing treatment about 1 hour, in stove, naturally cool to room temperature, obtain optical glass.Not analysis in obtained optical glass Go out the crystallization can observed with microscope.The characteristic of so obtained optical glass is listed in table 1.

Table 1

It should be noted that the various characteristics of optical glass are measured by method shown below.

(1) refractive index nd, ng, nF, nc and Abbe number vd

For the glass obtained with-30 DEG C/h of coolings of cooling rate, by the folding of Japanese Optical nitre industry meeting standard Penetrate rate algoscopy and measure refractive index nd, ng, nF, nc, Abbe number vd.

(2) liquidus temperature LT

Glass is put into and is heated to the stove of predetermined temperature and keeps 2 hours, after cooling, with the optical microscope of 100 times Inside sight glass, the presence or absence crystallized determine liquidus temperature.

(3) glass transition temperature Tg, yield point Ts

The thermo-mechanical analysis device using Co., Ltd. Rigaku to manufacture, will heat up speed and is set to 4 DEG C/min and surveys Fixed.

(4) partial dispersion is than Pg, F

Calculated by refractive index ng, nF, nc.

(5) partial dispersion is than the poor Δ Pg, F of deviation datum line

Counted than Pg, F (0) than the partial dispersion on Pg, F and the datum line calculated by Abbe number vd by partial dispersion Calculate.

(6) proportion

Use Archimedes method is measured.

(7)λ70、λ5

Use spectrophotometer, be measured trying to achieve to spectral transmission.

The making (1) of the most compressing frit

The glass forming body being made up of each optical glass made in above-mentioned 1. is cut into the sheet glass of more than 2, right Each sheet glass carries out grinding, grinding, makes compressing frit.

The making (2) of the most compressing frit

It is prepared as melten glass so that it is flow out from pipe, divided the front end of the melten glass stream of outflow with above-mentioned 1. From, obtain fused glass block, mould apply blast to this fused glass block and makes it float, be shaped simultaneously, Make compressing frit.So make the compressing frit that various optical glass as shown in Table 1 are constituted.

It should be noted that fused glass block can also be pressed on mould, next make compacting The glass of molding floats while cooling down, and makes frit.

4. the making of optical element

By above-mentioned 2., 3. in the compressing frit that makes import in press-moulding die, by frit and compacting Mould heats together, is softened by frit, carries out precision press molding, makes non-spherical lens.

It addition, by above-mentioned 2., 3. in make the heating of compressing frit, soften, import pre-heated compacting In mould, carry out precision press molding, make non-spherical lens.

No matter which kind of mode, all can obtain the optical element of high-quality by precision press molding method.

5. camera head and the making of optical system

Using each lens made in above-mentioned 4., the various replacements making the single-lens reflex camera being built-in with each lens are saturating Mirror.

And then use each lens made in above-mentioned 4., make various optical systems the assembly of small digital cameras Change.And then in these optical systems, the imageing sensor such as CCD or CMOS is installed and carries out modularization.

So, by using the various lens made in above-mentioned 4., it is possible to obtain high function, small-sized optical system, replace Change lens, lens subassembly, camera head.It addition, by the lens that will make in above-mentioned 4. and high refractivity high dispersion glass Glass lens combination, it is possible to obtain having carried out the various optical systems of high order chromatic aberration correction and having possessed the shooting of this optical system Device.

The optical glass of the present invention has high index of refraction characteristic and excellent precision press molding, glass transition temperature Low, it is suitable for the optical glass of precision press molding.It addition, the optical glass of the present invention is suitable for high order chromatic aberration correction Optical glass, can be suitably used for making compressing frit and optical element.

Claims

1. an optical glass, represents with cation %, and it contains:

In this optical glass,

Si⁴⁺And B³⁺The scope that total content is 35%～65%, and B³⁺The ratio B of content and above-mentioned total content³⁺/(Si⁴⁺+B³⁺) It is the scope of 0.3～1,

Li⁺、Na⁺And K⁺The scope that total content is 0～20%,

Zn²⁺Content and Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺And Zn²⁺The cation ratio Zn of total content²⁺/(Mg²⁺+Ca²⁺+Sr²⁺+Ba²⁺+ Zn²⁺) it is the scope of 0.30～1,

La³⁺、Gd³⁺And Y³⁺The scope that total content is 0～7%,

Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺The scope that total content is 10%～20%,

Ti⁴⁺Content and Ti⁴⁺And Nb⁵⁺The cation ratio Ti of total content⁴⁺/(Ti⁴⁺+Nb⁵⁺) it is the scope of 0～0.60,

Ti⁴⁺And W⁶⁺Total content and Ti⁴⁺、Nb⁵⁺、Ta⁵⁺And W⁶⁺The cation ratio (Ti of total content⁴⁺+W⁶⁺)/(Ti⁴⁺+Nb⁵⁺+ Ta⁵⁺+W⁶⁺) it is the scope of 0～0.70,

This optical glass is the oxide glass not containing Pb, and its refractive index nd is 1.750～1.850, and Abbe number ν d is 29.0 ～40.0, and glass transition temperature is less than 630 DEG C.

2. optical glass as claimed in claim 1, wherein, use g line, F line, each refractive index ng of c line, nF, nc and with (ng-nF) partial dispersion that/(nF-nc) represents is less than 0.600 than Pg, F.

3. optical glass as claimed in claim 1 or 2, wherein, following formula the partial dispersion obtained deviation delta Pg than Pg, F, F is less than 0.02,

Δ Pg, F=Pg, F+ (0.0018 × ν d)-0.6483

In formula, Pg, F represent use g line, F line, each refractive index ng of c line, nF, nc the portion represented with (ng-nF)/(nF-nc) Color separation dissipates ratio, and ν d represents Abbe number.

4. optical glass as claimed in claim 1 or 2, wherein, proportion is less than 4.5.

5. optical glass as claimed in claim 3, wherein, proportion is less than 4.5.

6. optical glass as claimed in claim 1 or 2, wherein, liquidus temperature is less than 1100 DEG C.

7. optical glass as claimed in claim 3, wherein, liquidus temperature is less than 1100 DEG C.

8. optical glass as claimed in claim 4, wherein, liquidus temperature is less than 1100 DEG C.

9. optical glass as claimed in claim 5, wherein, liquidus temperature is less than 1100 DEG C.

10. optical glass as claimed in claim 1 or 2, wherein, at the scope of wavelength 280nm～700nm, light penetration The wavelength X 70 reaching 70% is below 450nm.

11. optical glass as claimed in claim 3, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

12. optical glass as claimed in claim 4, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

13. optical glass as claimed in claim 5, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

14. optical glass as claimed in claim 6, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

15. optical glass as claimed in claim 7, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

16. optical glass as claimed in claim 8, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

17. optical glass as claimed in claim 9, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 70 of 70% is below 450nm.

18. optical glass as claimed in claim 1 or 2, wherein, at the scope of wavelength 280nm～700nm, light penetration The wavelength X 5 reaching 5% is below 370nm.

19. optical glass as claimed in claim 3, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

20. optical glass as claimed in claim 4, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

21. optical glass as claimed in claim 5, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

22. optical glass as claimed in claim 6, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

23. optical glass as claimed in claim 7, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

24. optical glass as claimed in claim 8, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

25. optical glass as claimed in claim 9, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches The wavelength X 5 of 5% is below 370nm.

26. optical glass as claimed in claim 10, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

27. optical glass as claimed in claim 11, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

28. optical glass as claimed in claim 12, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

29. optical glass as claimed in claim 13, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

30. optical glass as claimed in claim 14, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

31. optical glass as claimed in claim 15, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

32. optical glass as claimed in claim 16, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

33. optical glass as claimed in claim 17, wherein, in the scope of wavelength 280nm～700nm, light penetration reaches Wavelength X 5 to 5% is below 370nm.

34. 1 kinds of compressing frits, it is made up of the optical glass described in any one of claim of right1~33.

35. 1 kinds of optical elements, it is made up of the optical glass described in any one of claim of right1~33.

The manufacture method of 36. 1 kinds of optical elements, in this manufacture method, to the compressing glass described in claim 34 Material heats, and uses press-moulding die to carry out precision press molding, thus obtains optical element.