CN104445922A

CN104445922A - Optical glass and optical element

Info

Publication number: CN104445922A
Application number: CN201410471759.8A
Authority: CN
Inventors: 傅杰
Original assignee: Ohara Inc
Current assignee: Ohara Inc
Priority date: 2013-09-18
Filing date: 2014-09-16
Publication date: 2015-03-25

Abstract

The invention relates to optical glass and an optical element. The invention provides a kind of optical glass with high visible light transmittance, and the index of refraction and the abbe number of the optical glass is within the expected scope. In % by weight, the optical glass contains 1.0-30.0% of B2O3, 35.0-65.0% of La2O3, at least one of TiO2 and Nb2O5. The index of refraction is larager than 1.90, and the wave length of 70% of the index of refraction is lower than 470 nm when the depth is 10mm.

Description

Opticglass and optical element

Technical field

The present invention relates to opticglass and optical element.

Background technology

In recent years, the digitizing of the equipment of optical system and high-precision refinement is used to develop rapidly, in the field of the various optical devices such as the image players such as the photographic equipment such as digital camera, pick up camera, projector, projection TV (projection) equipment, reduce the number of the optical element such as lens, prism used in optical system, the requirement of optical system integral light and miniaturization is strengthened.

In the opticglass making optical element, especially can realize the lighting of optical system entirety and miniaturization, have more than 1.90 specific refractory power (n _d), have less than more than 20 40 Abbe number (ν _d) glass of high refractive index demand strongly.As such glass of high refractive index, known is the such glass composition of representative with patent documentation 1 ~ 3.

[prior art document]

[patent documentation]

[patent documentation 1] Japanese Unexamined Patent Publication 2010-030879 publication

[patent documentation 2] Japanese Unexamined Patent Publication 2012-162448 publication

No. 2008/050591st, [patent documentation 3] International Publication

Summary of the invention

[inventing problem to be solved]

When using such glass to make optical element, employ following method: to glass heats to be softened and the glass ware forming product carrying out extrusion forming (hot repressing is shaping) and obtain carry out the method for grinding grinding; To glass gob (gob) or glass block (glass block) are cut off and the preform material grinding and obtain or utilize known float glass process shaping etc. the shaping preform material obtained carries out thermoplastic, utilize the mould with high-precision molding surface to carry out the method (precision press formation) of extrusion forming.

But for glass disclosed in patent documentation 1 ~ 3, if carry out the compression moldings such as reheating extrusion forming, precision press formation, then painted or devitrification occurs glass, bring detrimentally affect thus to the optical characteristics of optical element.Therefore, glass disclosed in patent documentation 1 ~ 3 is unsuitable for the purposes of the optical element such as making the light transmission of visibility region such.

Especially, for glass disclosed in patent documentation 1 ~ 3, low relative to the transmissivity of the light of the short wavelength side of visible ray, thus glass coloring is yellow, is unsuitable for the purposes of the light transmission making visibility region.Therefore, require specific refractory power and Abbe number in desired scope, there is the opticglass of the high-transmission rate of the light of the short wavelength side relative to visible ray simultaneously.

The present invention puts in view of the above problems and completes, and its object is to provide specific refractory power and Abbe number in desired scope, have the opticglass of high transmission of visible light simultaneously.

In addition, the present invention also aims to the opticglass providing specific refractory power and Abbe number in desired scope, there is high transmission of visible light, there is high thermostability simultaneously.

[for solving the means of problem]

The present inventor etc., in order to solve above-mentioned problem, have repeatedly carried out going deep into experimental study, found that, containing B ₂o ₃composition, La ₂o ₃composition, and TiO ₂composition and Nb ₂o ₅in at least any one glass as required composition in composition, can obtain there is high specific refractory power and the high glass of transmission of visible light, thus complete the present invention.

Especially, the discoveries such as the present inventor, by containing B ₂o ₃composition, La ₂o ₃composition, and Nb ₂o ₅composition and TiO ₂in at least any one glass in composition, make Al ₂o ₃content is relative to SiO ₂the ratio of content within the limits prescribed, can improve the thermostability of glass.

In addition, the present inventor etc. also find, by containing B ₂o ₃composition, La ₂o ₃composition, and TiO ₂composition and Nb ₂o ₅containing ZnO component and WO at least any one glass in composition ₃composition, can improve the meltbility etc. of glass, thus can improve the transmission of visible light of glass.

Specifically, the invention provides following such scheme.

(1) opticglass, wherein, in mass %, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, containing TiO ₂composition and Nb ₂o ₅in composition at least any one, the specific refractory power of described opticglass is more than 1.90, and the wavelength of transmissivity showing 70% during thick 10mm is below 470nm.

(2) opticglass as described in (1), wherein, in mass %, containing the B of 5.0 ~ 30.0% ₂o ₃composition, containing the Nb adding up to 5.0 ~ 50.0% ₂o ₅composition and TiO ₂composition, Al ₂o ₃content relative to SiO ₂the ratio of content be less than more than 0.01 1.00.

(3) opticglass as described in (1) or (2), wherein, in mass %, Al ₂o ₃the content of composition is 0 ~ 10.0%, SiO ₂the content of composition is 0 ~ 20.0%.

(4) opticglass according to any one of (1) ~ (3), wherein, in mass %, also contains the Al of 0.1 ~ 10.0% ₂o ₃composition, 1.0 ~ 20.0% SiO ₂composition.

(5) opticglass according to any one of (1) ~ (4), wherein, in mass %,

TiO ₂composition is 0 ~ 30.0%,

Nb ₂o ₅composition is 0 ~ 30.0%.

(6) opticglass according to any one of (1) ~ (5), wherein, in mass %, WO ₃the content of composition is 0 ~ 20.0%.

(7) opticglass according to any one of (1) ~ (6), wherein, in mass %, the content of ZnO component is 0 ~ 20.0%.

(8) opticglass according to any one of (1) ~ (7), wherein, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

(9) opticglass according to any one of (1) ~ (8), wherein, in mass %, containing the Nb of 4.0 ~ 30.0% ₂o ₅composition, TiO ₂the content of composition is 0 ~ 15.0%.

(10) opticglass according to any one of (1) ~ (8), wherein, in mass %, containing the TiO of 10.0 ~ 30.0% ₂composition, the Nb of 4.0 ~ 20.0% ₂o ₅composition.

(11) opticglass according to any one of (1) ~ (8), wherein, in mass %, containing the TiO of 10.0 ~ 30.0% ₂composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%.

(12) opticglass according to any one of (1) ~ (8), wherein, in mass %, containing the TiO of 1.0 ~ 10.0% ₂composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%.

(13) opticglass according to any one of (1) ~ (12), wherein, mass ratio ((ZnO+WO ₃)/Nb ₂o ₅) be less than more than 0.20 2.00.

(14) opticglass according to any one of (1) ~ (13), wherein, in mass %, containing the WO adding up to 5.5 ~ 30.0% ₃composition and Nb ₂o ₅composition.

(15) opticglass according to any one of (1) ~ (14), wherein, mass ratio (WO ₃/ Nb ₂o ₅) be less than more than 0.10 2.00.

(16) opticglass according to any one of (1) ~ (15), wherein, mass ratio (WO ₃/ ZnO) be less than more than 0.10 3.00.

(17) opticglass according to any one of (1) ~ (16), wherein, mass ratio (WO ₃+ ZnO)/TiO ₂be less than more than 0.10 3.00.

(18) opticglass according to any one of (1) ~ (17), wherein, in mass %, containing the WO adding up to 1.0 ~ 30.0% ₃composition and ZnO component.

(19) opticglass according to any one of (1) ~ (18), wherein, in mass %,

Gd ₂o ₃composition is 0 ~ 20.0%,

Y ₂o ₃composition is 0 ~ 20.0%,

Yb ₂o ₃composition is 0 ~ 20.0%.

(20) opticglass according to any one of (1) ~ (19), wherein, quality and (Gd ₂o ₃+ Y ₂o ₃+ Yb ₂o ₃) be less than 20.0%.

(21) opticglass according to any one of (1) ~ (20), wherein, Ln ₂o ₃the quality of composition (in formula, Ln is more than a kind of being selected from La, Gd, Y, Yb) and be less than more than 35.0% 70.0%.

(22) opticglass according to any one of (1) ~ (21), wherein, in mass %, Ta ₂o ₅content be less than 15.0%.

(23) opticglass according to any one of (1) ~ (22), wherein, in mass %, Ta ₂o ₅content be less than 10.0%.

(24) opticglass according to any one of (1) ~ (23), wherein, in mass %,

MgO composition is 0 ~ 10.0%,

CaO composition is 0 ~ 20.0%,

SrO composition is 0 ~ 20.0%,

BaO composition is 0 ~ 20.0%.

(25) opticglass according to any one of (1) ~ (24), wherein, in mass %,

MgO composition is 0 ~ 10.0%,

CaO composition is 0 ~ 10.0%,

SrO composition is 0 ~ 10.0%,

BaO composition is 0 ~ 10.0%.

(26) opticglass according to any one of (1) ~ (25), wherein, R ¹o composition (in formula, R ¹for being selected from more than a kind in Mg, Ca, Sr, Ba, Zn) quality and be less than 20.0%.

(27) opticglass according to any one of (1) ~ (26), wherein, R ²o composition (in formula, R ²for being selected from more than a kind in Mg, Ca, Sr, Ba) quality and be less than 15.0%.

(28) opticglass according to any one of (1) ~ (27), wherein, R ²o composition (in formula, R ²for being selected from more than a kind in Mg, Ca, Sr, Ba) quality and be less than 10.0%.

(29) opticglass according to any one of (1) ~ (28), wherein, in mass %,

Li ₂o composition is 0 ~ 10.0%,

Na ₂o composition is 0 ~ 10.0%,

K ₂o composition is 0 ~ 10.0%.

(30) opticglass according to any one of (1) ~ (29), wherein, Rn ₂the quality of O composition (in formula, Rn is more than a kind of being selected from Li, Na, K) and be less than 10.0%.

(31) opticglass according to any one of (1) ~ (30), wherein, in mass %,

P ₂o ₅composition is 0 ~ 10.0%,

GeO ₂composition is 0 ~ 10.0%,

ZrO ₂composition is 0 ~ 20.0%,

Bi ₂o ₃composition is 0 ~ 10.0%,

TeO ₂composition is 0 ~ 10.0%,

SnO ₂composition is 0 ~ 5.0%,

Sb ₂o ₃composition is 0 ~ 1.0%.

(32) opticglass as described in (31), wherein, in mass %, SnO ₂the content of composition is 0 ~ 1.0%.

(33) opticglass according to any one of (1) ~ (32), it has the Abbe number (ν d) of less than more than 20 40.

(34) opticglass according to any one of (1) ~ (33), wherein, Pt is below 20ppm relative to the content of glass quality, and Pt ²⁺ratio be less than 80%.

(35) optical element, it is that opticglass according to any one of (1) ~ (34) is formed.

(36) manufacture method for glass forming body, wherein, uses the opticglass according to any one of (1) ~ (34), in mould, carries out extrusion forming to the above-mentioned opticglass softened.

[invention effect]

By the present invention, can obtain specific refractory power and Abbe number in desired scope, there is the opticglass of high transmission of visible light simultaneously.

In addition, by the present invention, can provide specific refractory power and Abbe number in desired scope, there is high transmission of visible light simultaneously and there is the opticglass of high thermostability.

Accompanying drawing explanation

[Fig. 1] for represent about the embodiment of the application and the glass of comparative example, mass ratio (Al ₂o ₃/ SiO ₂) start the figure of the relation of the difference (Δ T) of temperature with second-order transition temperature and crystallization.

Embodiment

Opticglass of the present invention contains the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 470nm.The present inventor finds: when containing B ₂o ₃composition, La ₂o ₃composition, and TiO ₂composition and Nb ₂o ₅in composition at least any one is as required composition time, sometimes can obtain high specific refractory power and the transmission of visible light of glass can be improved.Therefore, can obtain having more than 1.90 specific refractory power and less than more than 20 40 Abbe number, there is the opticglass of high transmission of visible light simultaneously.

Wherein, in the 1st opticglass, in mass %, containing the B of 5.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, containing the Nb adding up to 5.0 ~ 50.0% ₂o ₅composition and TiO ₂composition, Al ₂o ₃content relative to SiO ₂the ratio of content be less than more than 0.01 1.00, specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 470nm.

Especially, by the 1st opticglass, containing B ₂o ₃composition, La ₂o ₃composition, and Nb ₂o ₅composition and TiO ₂in composition at least any one, high specific refractory power can be obtained, and the transmission of visible light of glass can be improved.In addition, by making Al ₂o ₃content is relative to SiO ₂the ratio of content within the limits prescribed, and has other formations, can improve the thermostability of glass.Therefore, can obtain having more than 1.90 specific refractory power and less than more than 20 40 Abbe number, there is high transmission of visible light and there is the opticglass of high thermostability simultaneously.

On the other hand, in the 2nd ~ 5th opticglass, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, containing TiO ₂composition and Nb ₂o ₅in composition at least any one, TiO ₂the content of composition is 0 ~ 30.0%, Nb ₂o ₅the content of composition is 0 ~ 30.0%, and specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

In addition, in the 2nd opticglass, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, 4.0 ~ 30.0% Nb ₂o ₅composition, the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, TiO ₂the content of composition is 0 ~ 15.0%, and specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

In addition, in the 3rd opticglass, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, 10.0 ~ 30.0% TiO ₂composition, the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%, and specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

In addition, in the 4th opticglass, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, 10.0 ~ 30.0% TiO ₂composition, 4.0 ~ 20.0% Nb ₂o ₅composition, 0.5 ~ 20.0% WO ₃composition, 0.1 ~ 20.0% ZnO component, specific refractory power is more than 1.90, and the wavelength of transmissivity showing 70% during thick 10mm is below 450nm.

In addition, in the 5th opticglass, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, 1.0 ~ 10.0% TiO ₂composition, the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%, and specific refractory power is more than 1.90, and the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

Especially, by the 2nd ~ 5th opticglass, containing B ₂o ₃composition, La ₂o ₃composition, and TiO ₂composition and Nb ₂o ₅in composition at least any one, as required composition, can obtain high specific refractory power.In addition, by containing B ₂o ₃composition, La ₂o ₃composition, TiO ₂composition and Nb ₂o ₅in at least any one glass in composition, containing ZnO component and WO ₃composition, can improve the meltbility etc. of glass, thus can improve the transmission of visible light of glass.Therefore, can obtain having more than 1.90 specific refractory power and less than more than 20 40 Abbe number, there is the opticglass of high transmission of visible light simultaneously.

Below, describe the embodiment of opticglass of the present invention in detail, but the present invention is not by any restriction of following embodiment, in the scope of object of the present invention, can carry out appropriate change to implement.It should be noted that, for repeat specification part, sometimes suitably omit the description, but do not limit the purport of invention.

[glass ingredient]

The compositing range forming each composition of opticglass of the present invention is as described below.In this manual, unless otherwise specified, the content of each composition all represents with the quality % of the glass total mass of the composition that converts relative to oxide compound.Herein, " oxide compound converts and forms " refers to following composition: suppose that the oxide compound, double salt, metal fluoride etc. used as the raw material of glass constituent of the present invention is all decomposed when melting and is converted into oxide compound, now, using the total mass of this generation oxide compound as 100 quality %, represent the composition of each composition contained in glass.

< is about required composition, optional member >

B ₂o ₃composition is as the indispensable required composition of network former.

Especially, the B by containing more than 1.0% ₂o ₃composition, can improve the devitrification resistance of glass, and can reduce the dispersion of glass.Therefore, B ₂o ₃the lower limit of the content of composition is preferably 1.0%, be more preferably 4.0%, more preferably 5.0%, more preferably 6.0%, more preferably 7.0%, more preferably 8.0%, more preferably 9.0%.

On the other hand, by making B ₂o ₃the content of composition is less than 30.0%, can easily obtain larger specific refractory power, can suppress the deterioration of chemical durability.Therefore, B ₂o ₃the upper limit of the content of composition is preferably 30.0%, be more preferably 25.0%, more preferably 20.0%, more preferably 15.0%, more preferably 13.0%, more preferably 12.0%.

About B ₂o ₃composition, can use H as raw material ₃bO ₃, Na ₂b ₄o ₇, Na ₂b ₄o ₇10H ₂o, BPO ₄deng.

La ₂o ₃composition is the required composition improving the specific refractory power of glass and devitrification resistance, reduction dispersion (increase Abbe number).

Especially, the La by containing more than 35.0% ₂o ₃composition, can obtain desired high refractive index, and can improve devitrification resistance.Therefore, La ₂o ₃the lower limit of the content of composition is preferably 35.0%, be more preferably 35.5%, more preferably 36.0%, more preferably 40.0%, more preferably 43.0%, more preferably 46.0%.

On the other hand, by making La ₂o ₃the content of composition is less than 65.0%, can suppress the reduction of the meltbility of glass, can improve the devitrification resistance of glass.Therefore, La ₂o ₃the upper limit of the content of composition is preferably 65.0%, be more preferably 60.0%, more preferably 55.0%, more preferably 53.0%, more preferably 52.0%.

About La ₂o ₃composition, can use La as raw material ₂o ₃, La (NO ₃) ₃xH ₂o (X is arbitrary integer) etc.

Al ₂o ₃composition be greater than 0% amount containing sometimes improving the meltbility of glass and the composition of devitrification resistance.Especially, in the 1st opticglass, be required composition.Therefore, Al ₂o ₃the content of composition is preferably greater than 0%, and lower limit can be more preferably 0.1%, more preferably 0.3%.

On the other hand, by making Al ₂o ₃the content of composition is less than 10.0%, can suppress because of Al ₂o ₃composition excessive containing and the reduction of the devitrification resistance of glass that causes.Therefore, Al ₂o ₃the upper limit of the content of composition is preferably 10.0%, be more preferably 7.0%, more preferably 5.0%, more preferably 3.0%.

About Al ₂o ₃composition, can use Al as raw material ₂o ₃, Al (OH) ₃, AlF ₃deng.

SiO ₂composition be greater than 0% amount containing the viscosity that sometimes can improve melten glass, the painted of glass can be reduced, and the composition of devitrification resistance can be improved.Especially, in the 2nd ~ 5th opticglass, be required composition.Therefore, SiO ₂the content of composition is preferably greater than 0%, and lower limit can be more preferably 1.0%, more preferably 3.0%, more preferably 4.0%.

On the other hand, by making SiO ₂the content of composition is less than 20.0%, can suppress the reduction of the meltbility of glass, the rising of second-order transition temperature, the reduction of specific refractory power.Therefore, SiO ₂the upper limit of the content of composition is preferably 20.0%, be more preferably 15.0%, more preferably 12.0%, more preferably 10.0%, more preferably 8.0%.

About SiO ₂composition, can use SiO as raw material ₂, K ₂siF ₆, Na ₂siF ₆deng.

Especially, in the 1st opticglass, Al ₂o ₃content relative to SiO ₂the ratio of content be less than more than 0.01 1.00.By making this ratio be more than 0.01, the thermostability of glass can be improved, the meltbility of raw material can be improved simultaneously and the specific refractory power of glass can be improved.The discoveries such as present inventor, even if make mass ratio (Al ₂o ₃/ SiO ₂) be more than 0.01, by adjusting the content of other compositions, also can improve the devitrification resistance of glass, and the thermostability of glass can be improved.Therefore, the mass ratio (Al in the 1st opticglass ₂o ₃/ SiO ₂) lower limit be preferably 0.01, be more preferably 0.03, more preferably 0.05.

On the other hand, by making this and being less than 1.00, can suppress because of Al ₂o ₃composition excessive containing and the reduction of the devitrification resistance of glass that causes.Therefore, the mass ratio (Al in the 1st opticglass ₂o ₃/ SiO ₂) the upper limit be preferably 1.00, be more preferably 0.90, more preferably 0.85.

TiO ₂composition be the amount that is greater than 0% containing sometimes can improve glass specific refractory power, Abbe number can be adjusted to low value and the optional member of devitrification resistance can be improved.Therefore, TiO ₂the content of composition is preferably greater than 0%, and lower limit can be more preferably 1.0%, more preferably 2.5%, more preferably 3.0%, more preferably 5.0%, more preferably 6.0%, more preferably 8.0%.Especially, in the 3rd and the 4th opticglass, TiO ₂the lower limit of the content of composition can be preferably 10.0%, be more preferably 10.5%, more preferably 11.0%.

On the other hand, by making TiO ₂content be less than 30.0%, can reduce the painted of glass, improve transmission of visible light, that can suppress the Abbe number of glass exceeds necessary reduction.In addition, can suppress because of TiO ₂composition excessive containing and the devitrification that causes.Therefore, TiO ₂the upper limit of the content of composition is preferably 30.0%, be more preferably 25.0%, more preferably 22.0%, more preferably 20.0%, more preferably 18.0%, more preferably 17.0%.Especially, in the 2nd and the 5th opticglass, the upper limit can more preferably 15.0%, more preferably 11.5%, more preferably 10.0%, more preferably 9.8%, more preferably 9.5%.

About TiO ₂composition, can use TiO as raw material ₂deng.

Nb ₂o ₅composition be the amount that is greater than 0% containing sometimes can improve glass specific refractory power, can devitrification resistance be improved and can suppress because of TiO ₂the composition of the reduction of the Abbe number that composition causes.Especially, in the 2nd and the 4th opticglass, be required composition.Therefore, Nb ₂o ₅the content of composition can be preferably greater than 0%, more preferably greater than 1.0%, is preferably greater than 2.0% further.Especially, in the 2nd and the 4th opticglass, Nb ₂o ₅the lower limit of the content of composition can be preferably 4.0%, be more preferably 5.0%, more preferably 5.5%, more preferably 6.0%.

On the other hand, by making Nb ₂o ₅the content of composition is less than 30.0%, can suppress because of excessive containing and cause the reduction of devitrification resistance of glass, the reduction of the transmissivity of visible ray.Therefore, Nb ₂o ₅the upper limit of the content of composition is preferably 30.0%, be more preferably 25.0%, more preferably 23.0%, more preferably 20.0%, more preferably 15.0%, more preferably 11.0%, more preferably 10.0%.Especially, in the 3rd and the 5th opticglass, the upper limit can be preferably 5.0%, be more preferably 4.8%, more preferably 4.5%.

About Nb ₂o ₅composition, can use Nb as raw material ₂o ₅deng.

Opticglass of the present invention contains TiO ₂composition and Nb ₂o ₅in composition at least any one.Especially, in the 1st opticglass, Nb ₂o ₅composition and TiO ₂the content of composition and (quality and) be less than more than 5.0% 50.0%.

By containing TiO ₂composition and Nb ₂o ₅in composition at least any one, that is, make Nb ₂o ₅composition and TiO ₂the content of composition and be greater than 0%, the specific refractory power of glass can be improved, reduce Abbe number and can devitrification resistance be improved.Especially, the quality in the 1st opticglass and (Nb ₂o ₅+ TiO ₂) lower limit be preferably 5.0%, be more preferably 8.0%, more preferably 9.5%, more preferably 12.0%.

On the other hand, by making this and being less than 50.0%, the reduction of devitrification resistance of the glass caused because of excessive the containing of these compositions, the reduction of transmission of visible light can be suppressed.Therefore, quality and (Nb ₂o ₅+ TiO ₂) the upper limit can be preferably 50.0%, be more preferably 35.0%, more preferably 28.0%, more preferably 23.0%.

WO ₃composition be the amount that is greater than 0% containing sometimes can improve glass meltbility, reduce the glass that causes because of other high refractive index composition painted, improve specific refractory power and improve the composition of the devitrification resistance of glass simultaneously.Especially, in the 2nd ~ 5th opticglass, be required composition.In addition, WO ₃composition is also can reduce second-order transition temperature and can suppress because of TiO ₂composition, Nb ₂o ₅composition and the composition of the reduction of the Abbe number caused.Therefore, WO ₃the content of composition is preferably greater than 0%, and lower limit can be more preferably 0.5%, more preferably 1.0%, more preferably 1.5%, more preferably 1.8%, more preferably 2.0%, more preferably 3.5%.

On the other hand, by making WO ₃the content of composition is less than 20.0%, can reduce because of WO ₃composition and the glass that causes painted, improves transmission of visible light.Therefore, WO ₃the upper limit of the content of composition is preferably 20.0%, be more preferably 15.0%, more preferably 10.0%, more preferably 7.0%, more preferably 5.0%.

About WO ₃composition, can use WO as raw material ₃deng.

ZnO component be the amount that is greater than 0% containing sometimes can improve glass meltbility, can second-order transition temperature be reduced and the composition of chemical durability, devitrification resistance can be improved.Especially, in the 2nd ~ 5th opticglass, be required composition.In addition, due to rare-earth oxide substantially in the same manner, contribute to high refractive index and low dispersion, thus by the use of ZnO component, the use of expensive rare-earth oxide can be reduced.Therefore, the content of ZnO component is preferably greater than 0%, and lower limit can be preferably 0.1%, be more preferably 0.5%, more preferably 1.0%, more preferably 1.3%, more preferably 2.0%, more preferably 4.0%.

On the other hand, by making the content of ZnO component be less than 20.0%, the reduction of the specific refractory power of glass, the reduction of devitrification resistance can be suppressed.In addition, the viscosity of melten glass can be improved thus, thus can reduce the generation of the brush line in glass.Therefore, the upper limit of the content of ZnO component is preferably 20.0%, is more preferably 15.0%, more preferably 10.0%.

About ZnO component, ZnO, ZnF can be used as raw material ₂deng.

Nb ₂o ₅the content of composition is relative to ZnO component and WO ₃the content of composition and ratio (mass ratio) be preferably less than more than 0.20 2.00.

Especially, by making this ratio be more than 0.20, the melting of glass can be improved, and then transmission of visible light and the devitrification resistance of glass can be improved.Therefore, mass ratio (ZnO+WO ₃)/(Nb ₂o ₅) lower limit be preferably 0.20, be more preferably 0.22, more preferably 0.25.

On the other hand, from the viewpoint of suppressing the reduction of the devitrification resistance of glass, suppressing the reduction of the transmissivity of visible ray, the upper limit of this ratio can be preferably 2.00, be more preferably 1.80, more preferably 1.70.

WO ₃composition and Nb ₂o ₅the content of composition and (quality and) be preferably less than more than 5.5% 30.0%.

Especially, by making this and being more than 5.5%, specific refractory power and the devitrification resistance of glass can be improved, and can suppress such as because of TiO ₂composition and the Abbe number that causes exceed necessary reduction, painted.Therefore, quality and (WO ₃+ Nb ₂o ₅) lower limit be preferably 5.5%, be more preferably 6.0%, more preferably 6.5%, more preferably 7.0%.

On the other hand, by making this and being less than 20.0%, can suppress because of these compositions excessive containing and cause painted.Therefore, quality and (WO ₃+ Nb ₂o ₅) the upper limit be preferably 30.0%, be more preferably 15.0%, more preferably 13.0%.

WO ₃composition is relative to Nb ₂o ₅the ratio (mass ratio) of the content of composition is preferably less than more than 0.10 3.00.

Especially, by making this ratio be more than 0.10, meltbility and the devitrification resistance of glass can be improved, and can suppress such as because of Nb ₂o ₅composition and the reduction of the Abbe number caused, transmissivity.Therefore, mass ratio (WO ₃/ Nb ₂o ₅) lower limit be preferably 0.10, be more preferably 0.13, more preferably 0.16.

On the other hand, from reducing because of WO ₃the painted viewpoint of composition and the glass that causes is considered, the upper limit of this ratio can be preferably 3.00, be more preferably 2.00, more preferably 1.50, more preferably 1.00.

WO ₃composition is preferably less than more than 0.10 3.00 relative to the ratio (mass ratio) of the content of ZnO component.

Especially, by making this ratio be more than 0.10, specific refractory power and the devitrification resistance of glass can be improved, and can suppress because of TiO ₂composition, Nb ₂o ₅composition and the reduction of the Abbe number caused, transmissivity.Therefore, mass ratio (WO ₃/ ZnO) lower limit be preferably 0.10, be more preferably 0.12, more preferably 0.15.

On the other hand, from the viewpoint of the suppression specific refractory power of glass, the reduction of devitrification resistance, the upper limit of this ratio can be preferably 3.00, be more preferably 1.80, more preferably 1.60.

WO ₃the content of composition and ZnO component and relative to TiO ₂content ratio (mass ratio) be preferably less than more than 0.10 3.00.

Especially, by making this ratio be more than 0.10, meltbility and the devitrification resistance of glass can be improved, and can suppress because of TiO ₂composition etc. and the reduction of the Abbe number caused, transmissivity.Therefore, mass ratio (WO ₃/ Nb ₂o ₅) lower limit be preferably 0.10, be more preferably 0.40, more preferably 0.80, more preferably 1.00.

On the other hand, the viewpoint of the desired high refractive index that is easy to get calmly is considered, the upper limit of this ratio can be preferably 3.00, be more preferably 3.00, more preferably 2.80, more preferably 2.50.

WO ₃the content of composition and ZnO component and (quality and) be preferably less than more than 1.0% 30.0%.

Especially, by making this and being more than 1.0%, the melting of glass can be improved and then devitrification resistance, the transmission of visible light of glass can be improved.Therefore, quality and (WO ₃+ ZnO) lower limit be preferably 1.0%, be more preferably 2.0%, more preferably 4.0%, more preferably 5.0%, more preferably 5.50%, more preferably 5.6%, more preferably 8.0%.

On the other hand, by making this and being less than 30.0%, the reduction of the devitrification resistance caused because of excessive the containing of these compositions can be suppressed.Therefore, quality and (WO ₃+ ZnO) the upper limit be preferably 30.0%, be more preferably 25.0%, more preferably 20.0%, more preferably 17.0%, more preferably 15.0%, more preferably 13.0%.

Gd ₂o ₃composition is the amount that is greater than 0% containing sometimes can improving the specific refractory power of glass and Abbe number and can improving the optional member of devitrification resistance.

On the other hand, by by Gd expensive especially in rare earth element ₂o ₃composition is reduced to less than 20.0%, can reduce the material cost of glass, thus can make more cheap opticglass.In addition, thus, that can suppress the Abbe number of glass exceeds necessary rising, can suppress the reduction of the meltbility of glass.Therefore, Gd ₂o ₃the upper limit of the content of composition is preferably 20.0% respectively, be more preferably 10.0%, more preferably 5.0%, more preferably 3.0%.

About Gd ₂o ₃composition, can use Gd as raw material ₂o ₃, GdF ₃deng.

Y ₂o ₃composition be greater than 0% amount containing sometimes, maintain high refractive index and high Abbe number, can devitrification resistance be improved simultaneously, the material cost of glass can be suppressed compared with other rare earth class composition, and low-gravity optional member can be fallen.Therefore, Y ₂o ₃the content of composition can be preferably greater than 0%, more preferably greater than 0.5%, is preferably greater than 1.0% further.

On the other hand, by making Y ₂o ₃the content of composition is less than 20.0%, can suppress the reduction of the specific refractory power of glass, and can improve the devitrification resistance of glass.In addition, the reduction of the meltbility of glass can be suppressed, the material cost of glass can be suppressed further.Therefore, Y ₂o ₃the upper limit of the content of composition is preferably 20.0%, be more preferably 15.0%, more preferably 10.0%, more preferably 5.0%, more preferably 3.0%.

About Y ₂o ₃composition, can use Y as raw material ₂o ₃, YF ₃deng.

Yb ₂o ₃the composition optional member that to be the amount that is greater than 0% disperse containing the specific refractory power and can reducing that sometimes can improve glass.

On the other hand, by making Yb ₂o ₃the content of composition is less than 20.0%, can improve the devitrification resistance of glass.Therefore, Yb ₂o ₃the upper limit of the content of composition is preferably 20.0%, be more preferably 10.0%, more preferably 5.0%, more preferably 3.0%.

About Yb ₂o ₃composition, can use Yb as raw material ₂o ₃deng.

Gd ₂o ₃composition, Y ₂o ₃composition and Yb ₂o ₃the content of composition and (quality and) be preferably less than 20.0%.Thus, the meltbility of glass can be improved.In addition, because the content of the composition of these costlinesses is reduced, the material cost of glass can thus be suppressed.Therefore, quality and (Gd ₂o ₃+ Y ₂o ₃+ Yb ₂o ₃) being preferably less than 20.0%, the upper limit is more preferably 10.0%, more preferably 6.0%, more preferably 4.0%, more preferably 2.0%.

Ln ₂o ₃the content of composition (in formula, Ln is more than a kind of being selected from La, Gd, Y, Yb) and (quality and) be preferably less than more than 35.0% 70.0%.

Especially, by making this and being more than 35.0%, the meltbility of glass, devitrification resistance can be improved, the dispersion of glass can be reduced.Therefore, Ln ₂o ₃the quality of composition and lower limit be preferably 35.0%, be more preferably 35.5%, more preferably 36.0%, more preferably 40.0%, more preferably 43.0%, more preferably 46.0%.

On the other hand, by making this and being less than 70.0%, the liquidus temperature of glass reduces, and thus can improve devitrification resistance.Therefore, Ln ₂o ₃the quality of composition and the upper limit be preferably 70.0%, be more preferably 65.0%, more preferably 60.0%, more preferably 55.0%, more preferably 54.0%.

Ta ₂o ₅composition is the amount that is greater than 0% containing the specific refractory power that sometimes can improve glass and can improves the optional member of devitrification resistance.

On the other hand, by the Ta by costliness ₂o ₅composition is reduced to less than 15.0%, can reduce the material cost of glass, thus can make more cheap opticglass.In addition, thus, the temperature of fusion of raw material reduces, and can reduce the energy required for fusing of raw material, thus also can reduce the manufacturing cost of opticglass.Therefore, Ta ₂o ₅the upper limit of the content of composition is preferably 15.0%, be more preferably 10.0%, more preferably 5.0%, more preferably 3.0%, more preferably 1.0%.

About Ta ₂o ₅composition, can use Ta as raw material ₂o ₅deng.

MgO composition, CaO composition, SrO composition and BaO composition be greater than 0% amount containing the optional member that sometimes can improve the meltbility of frit, the devitrification resistance of glass.

On the other hand, be less than 10.0% by making the content of MgO composition, and/or, make the respective content of CaO composition, SrO composition and BaO composition be less than 20.0%, can suppress because of these compositions excessive containing and cause the reduction of specific refractory power, the reduction of devitrification resistance.Therefore, the upper limit of the content of MgO composition is preferably 10.0%, is more preferably 5.0%, more preferably 3.0%.In addition, the upper limit of the respective content of CaO composition, SrO composition and BaO composition be preferably 20.0%, be more preferably 10.0%, more preferably 5.0%, more preferably 3.0%.

About MgO composition, CaO composition, SrO composition and BaO composition, MgCO can be used as raw material ₃, MgF ₂, CaCO ₃, CaF ₂, Sr (NO ₃) ₂, SrF ₂, BaCO ₃, Ba (NO ₃) ₂, BaF ₂deng.

R ¹o composition (in formula, R ¹for being selected from more than a kind in Mg, Ca, Sr, Ba) total content (quality and) be preferably less than 20.0%.Thus, can suppress because of R ¹o composition excessive containing causing, the reduction of specific refractory power of glass, the reduction of devitrification resistance.Therefore, R ¹the quality of O composition and the upper limit be preferably 20.0%, be more preferably 15.0%, more preferably 10.0%.

R ²o composition (in formula, R ²for being selected from more than a kind in Mg, Ca, Sr, Ba) total content (quality and) be preferably less than 15.0%.Thus, can suppress because of R ²o composition excessive containing causing, the reduction of specific refractory power of glass, the reduction of devitrification resistance.Therefore, R ²the quality of O composition and the upper limit be preferably 15.0%, be more preferably 10.0%, more preferably 5.0%, more preferably 3.0%.

Li ₂o composition, Na ₂o composition and K ₂o composition is the amount that is greater than 0% containing the meltbility sometimes can improving glass and can reduces the optional member of second-order transition temperature.Wherein, Na ₂o composition and K ₂o composition is also the composition of the devitrification resistance that can improve glass.

On the other hand, by making Li ₂o composition, Na ₂o composition and K ₂the respective content of O composition is less than 10.0%, the specific refractory power of glass can be made to be difficult to reduce, and can improve devitrification resistance.Therefore, Li ₂o composition, Na ₂o composition and K ₂the upper limit of the respective content of O composition is preferably 10.0%, is more preferably 8.0%, more preferably 5.0%.

Especially, by making Li ₂the content of O composition is less than 3.0%, and the viscosity of glass improves, and thus can reduce the brush line of glass.Therefore, from the viewpoint of the brush line reducing glass, Li ₂the upper limit of the content of O composition can be preferably 3.0%, be more preferably 1.0%, more preferably 0.3%.

About Li ₂o composition, Na ₂o composition and K ₂o composition, can use Li as raw material ₂cO ₃, LiNO ₃, Li ₂cO ₃, NaNO ₃, NaF, Na ₂siF ₆, K ₂cO ₃, KNO ₃, KF, KHF ₂, K ₂siF ₆deng.

Rn ₂the total amount of O composition (in formula, Rn is more than a kind of being selected from Li, Na, K) is preferably less than 10.0%.Thus, the reduction of the specific refractory power of glass can be suppressed, and can devitrification resistance be improved.Therefore, Rn ₂the quality of O composition and the upper limit be preferably 10.0%, be more preferably 5.0%, more preferably 3.0%.

P ₂o ₅composition is the amount that is greater than 0% containing the optional member of devitrification resistance that sometimes can improve glass.

On the other hand, by making P ₂o ₅the content of composition is less than 10.0%, can suppress the reduction of the chemical durability of glass, especially water tolerance.Therefore, P ₂o ₅the upper limit of the content of composition is preferably 10.0%, is more preferably 5.0%, more preferably 3.0%.

About P ₂o ₅composition, can use Al (PO as raw material ₃) ₃, Ca (PO ₃) ₂, Ba (PO ₃) ₂, BPO ₄, H ₃pO ₄deng.

GeO ₂composition is the amount that is greater than 0% containing the specific refractory power that sometimes can improve glass and can improves the optional member of devitrification resistance.

But, due to GeO ₂cost of material high, so when its amount is many, the material cost of glass raises.Therefore, GeO ₂the upper limit of the content of composition is preferably 10.0%, is more preferably 5.0%, more preferably 3.0%.

About GeO ₂composition, can use GeO as raw material ₂deng.

ZrO ₂composition is the amount that is greater than 0% containing sometimes contributing to the high refractive index of glass and low decentralized and can improve the optional member of the devitrification resistance of glass.Therefore, ZrO ₂the content of composition is preferably greater than 0%, and lower limit can be more preferably 1.0%, more preferably 2.0%, more preferably 3.0%, more preferably 4.0%, more preferably 5.0%.

On the other hand, by making ZrO ₂the content of composition is less than 20.0%, can suppress because of ZrO ₂composition excessive containing and the reduction of the devitrification resistance of glass that causes.Therefore, ZrO ₂the upper limit of the content of composition is preferably 20.0%, is more preferably 10.0%, more preferably 8.0%.

About ZrO ₂composition, can use ZrO as raw material ₂, ZrF ₄deng.

Bi ₂o ₃composition is the amount that is greater than 0% containing sometimes improving specific refractory power and reducing the optional member of second-order transition temperature.

On the other hand, by making Bi ₂o ₃the content of composition is less than 10.0%, can improve the devitrification resistance of glass, and reduce the painted of glass, can improve transmission of visible light.Therefore, Bi ₂o ₃the upper limit of the content of composition is preferably 10.0%, is more preferably 5.0%, more preferably 3.0%.

About Bi ₂o ₃composition, can use Bi as raw material ₂o ₃deng.

TeO ₂composition is the amount that is greater than 0% containing sometimes improving specific refractory power and reducing the optional member of second-order transition temperature.

On the other hand, TeO ₂exist when the crucible at platinum or in the fusion tank that the part contacted with melten glass is formed by platinum by frit melting time, the problem of alloying can be carried out with platinum.Therefore, TeO ₂the upper limit of the content of composition is preferably 10.0%, be more preferably 5.0%, more preferably 3.0%, more preferably 1.0%.

About TeO ₂composition, can use TeO as raw material ₂deng.

SnO ₂composition be greater than 0% amount containing sometimes reducing the oxidation of melten glass and making it clarify, and the optional member of the transmission of visible light of glass can be improved.

On the other hand, by making SnO ₂the content of composition is less than 5.0%, can reduce the devitrification of painted, the glass of the glass caused because of the reduction of melten glass.In addition, due to can SnO be reduced ₂the alloying of composition and melting unit (especially the precious metal such as Pt), thus can seek the long lifetime of melting unit.Therefore, SnO ₂the upper limit of the content of composition is preferably 5.0%, be more preferably 2.0%, more preferably 1.0%, more preferably 0.7%, more preferably 0.5%.

About SnO ₂composition, can use SnO, SnO as raw material ₂, SnF ₂, SnF ₄deng.

Sb ₂o ₃composition is the amount that is greater than 0% containing sometimes by the optional member of melten glass deaeration.

On the other hand, if Sb ₂o ₃too much, then the transmissivity in the short wavelength region of visible region is deteriorated amount.Therefore, Sb ₂o ₃the upper limit of the content of composition is preferably 1.0%, is more preferably 0.7%, more preferably 0.5%.

About Sb ₂o ₃composition, can use Sb as raw material ₂o ₃, Sb ₂o ₅, Na ₂h ₂sb ₂o ₇5H ₂o etc.

It should be noted that, make glass clarifying, the composition of deaeration is not limited to above-mentioned Sb ₂o ₃composition, can use known finings in glass manufacturing area, deaerating agent or their combination.

< is about the composition > that should not contain

Next, the composition that opticglass of the present invention should not contain is described and contains sometimes undesirable composition.

As required, can not damage the present application glass characteristic scope in add other compositions.But, each transiting metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo etc. except Ti, Zr, Nb, W, La, Gd, Y, Yb, Lu has following character: though separately or compound contains a small amount of each composition time, glass also can be painted, produce at the specific wavelength place of visible-range and absorb, therefore, especially in the opticglass of wavelength using visibility region, preferably in fact not containing mentioned component.

In addition, lead compound and the As such as PbO ₂o ₃be the composition that carrying capacity of environment is large Deng arsenic compound, therefore, expect not contain in fact, that is, except being inevitably mixed into, do not contain completely.

And then each composition of Th, Cd, Tl, Os, Be and Se, as harmful chemical substance, has the tendency controlling it and use in recent years.Not only in the manufacturing process of glass, and until disposal after manufacturing procedure and commercialization, need the measure in environmental cure.Therefore, when paying attention to affecting environmentally, preferably in fact not containing these.

About glass composition of the present invention, its composition represents with the quality % of the glass total mass of the composition that converts relative to oxide compound, therefore, not directly with % by mole record represent, but meet each composition existed in the glass composition of each characteristic required in the present invention based on % by mole represent composition in oxide compound convert composition roughly get following value.

B ₂o ₃composition is 2.0 ~ 40.0 % by mole, and

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

And,

SiO ₂composition is 0 ~ 35.0 % by mole,

Nb ₂o ₅composition is 0 ~ 15.0 % by mole,

TiO ₂composition is 0 ~ 50.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 30.0 % by mole,

SrO composition is 0 ~ 20.0 % by mole,

BaO composition is 0 ~ 15.0 % by mole,

ZnO component is 0 ~ 30.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 15.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

WO ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 5.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

Wherein, each composition contained in the 1st glass based on % by mole represent composition in oxide compound convert composition roughly get following value.

B ₂o ₃composition is 10.0 ~ 40.0 % by mole, and

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

And,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

SiO ₂composition is 0 ~ 35.0 % by mole,

Nb ₂o ₅composition is 0 ~ 15.0 % by mole,

TiO ₂composition is 0 ~ 40.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 30.0 % by mole,

SrO composition is 0 ~ 20.0 % by mole,

BaO composition is 0 ~ 15.0 % by mole,

ZnO component is 0 ~ 30.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 10.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Ta ₂o ₅composition is 0 ~ 3.0 % by mole,

WO ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 3.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 1.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

On the other hand, each composition contained in the 2nd ~ 5th glass based on % by mole represent composition in oxide compound convert composition roughly get following value.

SiO ₂composition is 2.0 ~ 35.0 % by mole,

B ₂o ₃composition is 2.0 ~ 40.0 % by mole,

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

TiO ₂composition is 2.0 ~ 50.0 % by mole,

ZnO component is 0.5 ~ 30.0 % by mole, and

WO ₃composition is 0.5 ~ 10.0 % by mole,

And,

Nb ₂o ₅composition is 0 ~ 15.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 20.0 % by mole,

SrO composition is 0 ~ 10.0 % by mole,

BaO composition is 0 ~ 10.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 15.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 5.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

Wherein, each composition contained in the 2nd glass based on % by mole represent composition in oxide compound convert composition roughly get following value.

SiO ₂composition is 2.0 ~ 35.0 % by mole,

B ₂o ₃composition is 2.0 ~ 40.0 % by mole,

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

Nb ₂o ₅composition is 2.0 ~ 15.0 % by mole,

ZnO component is 0.5 ~ 30.0 % by mole, and

WO ₃composition is 0.5 ~ 10.0 % by mole,

And,

TiO ₂composition is 0 ~ 25.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 20.0 % by mole,

SrO composition is 0 ~ 10.0 % by mole,

BaO composition is 0 ~ 10.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 10.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 3.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

In addition, each composition contained in the 3rd opticglass based on % by mole represent composition in oxide compound convert composition roughly get following value.

SiO ₂composition is 2.0 ~ 35.0 % by mole,

B ₂o ₃composition is 2.0 ~ 40.0 % by mole,

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

TiO ₂composition is 15.0 ~ 50.0 % by mole,

ZnO component is 0.5 ~ 30.0 % by mole, and

WO ₃composition is 0.5 ~ 10.0 % by mole,

And,

Nb ₂o ₅composition is 0 ~ 3.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 20.0 % by mole,

SrO composition is 0 ~ 10.0 % by mole,

BaO composition is 0 ~ 10.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 10.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 3.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

In addition, each composition contained in the 4th opticglass based on % by mole represent composition in oxide compound convert composition roughly get following value.

SiO ₂composition is 3.0 ~ 35.0 % by mole,

B ₂o ₃composition is 2.0 ~ 40.0 % by mole,

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

TiO ₂composition is 20.0 ~ 40.0 % by mole,

Nb ₂o ₅composition is 0 ~ 2.0 % by mole,

ZnO component is 0.5 ~ 25.0 % by mole, and

WO ₃composition is 0.5 ~ 10.0 % by mole,

And,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 20.0 % by mole,

SrO composition is 0 ~ 10.0 % by mole,

BaO composition is 0 ~ 10.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 15.0 % by mole,

K ₂o composition is 0 ~ 10.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 5.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

In addition, each composition contained in the 5th opticglass based on % by mole represent composition in oxide compound convert composition roughly get following value.

SiO ₂composition is 3.0 ~ 35.0 % by mole, and

B ₂o ₃composition is 2.0 ~ 40.0 % by mole,

La ₂o ₃composition is 15.0 ~ 25.0 % by mole,

TiO ₂composition is 2.0 ~ 15.0 % by mole,

ZnO component is 0.5 ~ 30.0 % by mole,

WO ₃composition is 0.5 ~ 10.0 % by mole,

And,

Nb ₂o ₅composition is 0 ~ 3.0 % by mole,

Gd ₂o ₃composition is 0 ~ 5.0 % by mole,

Y ₂o ₃composition is 0 ~ 10.0 % by mole,

Yb ₂o ₃composition is 0 ~ 5.0 % by mole,

Ta ₂o ₅composition is 0 ~ 5.0 % by mole,

MgO composition is 0 ~ 25.0 % by mole,

CaO composition is 0 ~ 20.0 % by mole,

SrO composition is 0 ~ 10.0 % by mole,

BaO composition is 0 ~ 10.0 % by mole,

Li ₂o composition is 0 ~ 30.0 % by mole,

Na ₂o composition is 0 ~ 20.0 % by mole,

K ₂o composition is 0 ~ 15.0 % by mole,

P ₂o ₅composition is 0 ~ 8.0 % by mole,

GeO ₂composition is 0 ~ 10.0 % by mole,

ZrO ₂composition is 0 ~ 20.0 % by mole,

Al ₂o ₃composition is 0 ~ 10.0 % by mole,

Bi ₂o ₃composition is 0 ~ 5.0 % by mole,

TeO ₂composition is 0 ~ 10.0 % by mole,

SnO ₂composition is 0 ~ 5.0 % by mole, or

Sb ₂o ₃composition is 0 ~ 0.5 % by mole.

[manufacture method]

Opticglass of the present invention such as makes in the following way.Namely, Homogeneous phase mixing above-mentioned raw materials makes each composition in the scope of the content of regulation, the mixture made is put in platinum crucible, according to the melting difficulty of glass composition, in electric furnace, in the temperature range of 1100 ~ 1500 DEG C, carry out melting in 2 ~ 5 hours, and stirring homogenizes, then suitable temperature is reduced to, then be poured in mould, Slow cooling, make thus.

[physical property]

Opticglass of the present invention preferably has high refractive index and high Abbe number (low dispersion).Especially, the specific refractory power (n of opticglass of the present invention _d) lower limit be preferably 1.90, be more preferably 1.91, more preferably 1.92, more preferably 1.95.The upper limit of this specific refractory power can be preferably 2.20, be more preferably 2.10, more preferably 2.00.In addition, the Abbe number (ν of opticglass of the present invention _d) lower limit be preferably 20, be more preferably 23, more preferably 25, more preferably 26, more preferably 27, more preferably 30, the upper limit is preferably 40, be more preferably 38, more preferably 35, more preferably 33, more preferably 32.

By having such high refractive index, even if thus the slimming seeking optical element also can obtain large refraction of light amount.In addition, by having so low dispersion, even if thus be that the focus that simple lens also can reduce because the wavelength difference of light causes departs from (aberration).In addition, by having so low dispersion, thus such as with when there is the optical element combination of high dispersive (low Abbe number), high imaging characteristic etc. can be sought.

Therefore, opticglass of the present invention is useful in optical design, particularly not only can realize high imaging characteristic etc., and can realize the miniaturization of optical system, the degree of freedom of easily extensible optical design.

The transmissivity of the light of the short wavelength side in the preferred transmission of visible light of opticglass of the present invention, especially visible ray is high, thus painted few.

Especially, for opticglass of the present invention, if represent with the transmissivity of glass, then in the sample of thick 10mm, show the wavelength (λ of spectral-transmission favtor 70% ₇₀) the upper limit be preferably 470nm, be more preferably 450nm, more preferably 440nm, be preferably less than 440nm further.This wavelength X ₇₀the upper limit more preferably 430nm, more preferably 425nm, preferably can be less than 420nm further.

Thus, the absorption limit of glass is positioned near ultraviolet region, can improve the transparency of glassy phase for visible ray, thus, preferably this opticglass can be used for the optical element that lens etc. make light transmission.

Opticglass of the present invention has high meltbility, thus can suppress the reduction etc. because of glass ingredient and the reduction of the transmission of visible light caused.

Especially, the 1st opticglass has high thermostability.That is, the lower limit that in opticglass of the present invention, second-order transition temperature (Tg) starts the poor Δ T of temperature (Tx) with crystallization is preferably 155 DEG C, is more preferably 158 DEG C, more preferably 160 DEG C.Thus, time more than by glass heats to second-order transition temperature, become and be difficult to the generation of the nuclei of crystallization caused at inside glass, the growth of crystallization, therefore, the thermostability of glass improves.Therefore, can reduce by during opticglass compression molding, the opacification that causes with the crystallization because of glass and devitrification is representative, detrimentally affect that the optical characteristics of optical element is caused.

It should be noted that, in opticglass of the present invention, such as, by improving Al ₂o ₃/ SiO ₂than etc., second-order transition temperature reduces, and can improve crystallization and start temperature, therefore, can increase the numerical value of above-mentioned Δ T, think that this is a reason that can improve thermostability.

In addition, in opticglass of the present invention, Pt is below 20ppm relative to the content of glass quality, and, Pt in the whole platinum compositions contained in preferred glass ²⁺ratio be less than 80%.For opticglass of the present invention, especially when being melted with platinum crucible, the platinum contained in crucible and glass melt react, Pt ²⁺situation about being mixed in glass Deng platinum ion is more, but passes through the content of Pt, Pt ²⁺ratio suppress in above-mentioned scope, the reduction of the visibility region transmissivity of glass can be suppressed, therefore, the preferred opticglass of material as optical element can be obtained.Especially, in the present application, by using fluorochemical in frit, thus promote Pt ²⁺to Pt ⁴⁺oxidation, therefore, the few and Pt of the content that can obtain Pt ²⁺the few glass of ratio.Infer that this is a reason that can obtain high visibility region transmissivity in opticglass of the present invention.

It should be noted that, the content of the Pt contained in opticglass measures in the following way: use by HF, HClO ₄, HNO ₃, the composition such as HCl nitration mixture the glass specimen through pulverizing is decomposed, be heated evaporation, become drying solid, add nitric acid in the salt obtained thus, use ICP mass spectrograph is analyzed gains.

In addition, Pt ²⁺ratio measure by such as under type: high energy radiation is carried out to glass specimen, utilizes EXAFS (Extended X-ray Absorption Fine Structure) to carry out analyzing to measure.

[glass forming body and optical element]

The method of the compression moldings such as the shaping or precision press formation of such as grinding method or hot repressing can be used, make glass forming body by the opticglass made.Namely, the mechanical workout such as grinding and grinding can be carried out to make glass forming body to opticglass, or the preform be made up of opticglass is carried out hot repressing shaping after carry out attrition process to make glass forming body, or the preform made carrying out attrition process, utilize known float glass process shaping etc. and the shaping preform obtained carries out precision press formation to make glass forming body.It should be noted that, the method making glass forming body is not limited to aforesaid method.

Like this, the glass forming body formed by opticglass of the present invention is useful in multiple optical element and optical design, but is wherein particularly preferred for the optical element such as lens, prism.Thus, the glass forming body that diameter is large can be formed, therefore can realize for fine during the optical device such as photographic camera, projector and high-precision imaging characteristic and projection property while the maximization seeking optical element.

[embodiment]

By embodiments of the invention (No.A1 ~ No.A16, No.B1 ~ No.B27, No.C1 ~ No.C20, No.D1 ~ No.D10, No.E1 ~ No.E8) and the composition of comparative example (No.a ~ No.b) and the specific refractory power (n of these glass _d), Abbe number (ν _d), spectral-transmission favtor display 70% wavelength (λ ₇₀) result and second-order transition temperature (Tg), crystallization start the difference (Δ T) that temperature (Tx), second-order transition temperature and crystallization start temperature and be shown in table 1 ~ table 13.

Herein, embodiment (No.A1 ~ No.A16) and comparative example (No.a) are embodiment and the comparative example of the 1st opticglass, and embodiment (No.B1 ~ No.B27) and comparative example (No.b) are embodiment and the comparative example of the 2nd opticglass.In addition, embodiment (No.C1 ~ No.C20) is the embodiment of the 3rd opticglass, embodiment (No.D1 ~ No.D10) is the embodiment of the 4th opticglass, and embodiment (No.E1 ~ No.E8) is the embodiment of the 5th opticglass.

It should be noted that, following embodiment is only example object, is not limited to these embodiments.

The glass of embodiments of the invention and comparative example makes all in the following manner: select as the raw material of each composition oxide compound suitable respectively, oxyhydroxide, carbonate, nitrate, fluorochemical, oxyhydroxide, the high-purity raw used in the common opticglass such as metaphosphoric acid compound, weighing is carried out and Homogeneous phase mixing with the ratio of the composition of each embodiment shown in table, then put in platinum crucible, according to the melting difficulty of glass composition, use electric furnace in the temperature range of 1100 ~ 1500 DEG C, carry out melting in 2 ~ 5 hours, then stir and homogenize, then be poured in mould etc., Slow cooling, make glass thus.

Herein, the specific refractory power of the glass of embodiment and comparative example and Abbe number can measure by standard JOGIS01-2003 based on the industry of Japanese Optical nitre.Herein, specific refractory power and Abbe number are by for making Slow cooling cooling rate for-25 DEG C/hr and the glass that obtains carries out measuring and obtain.

In addition, the transmissivity of the glass of embodiment and comparative example can measure by standard JOGIS02 based on the industry of Japanese Optical nitre.It should be noted that, in the present invention, by measuring the transmissivity of glass, obtaining glass has non-coloring and degree thereof.Specifically, based on JISZ8722, to the opposed parallel grinding object of thick 10 ± 0.1mm, measure the spectral-transmission favtor of 200 ~ 800nm, obtain λ ₇₀(wavelength during transmissivity 70%).

In addition, the second-order transition temperature (Tg) of the glass of embodiment (No.A1 ~ No.A16) and comparative example (No.a) and crystallization start temperature (Tx) and obtain by carrying out employing the mensuration of differential heat determination device (NETZSCH (ネッチゲレテバウ company) STA409CD processed) in nitrogen atmosphere.Herein, make sample granularity when measuring be 425 ~ 600 μm, be warming up to 1200 DEG C with the heat-up rate of 10 DEG C/min from 100 DEG C.Then, by second-order transition temperature (Tg) and crystallization, the difference of temperature (Tx) obtains Δ T.

[table 1]

[table 2]

[table 3]

[table 4]

[table 5]

[table 6]

[table 7]

[table 8]

[table 9]

[table 10]

[table 11]

[table 12]

[table 13]

The λ of the opticglass of embodiments of the invention ₇₀(wavelength during transmissivity 70%) is below 470nm, in more detail, is below 450nm.

Especially, the λ of the opticglass of embodiment (No.B1 ~ No.B27) ₇₀(wavelength during transmissivity 70%) is below 440nm, in more detail, is below 425nm.On the other hand, the λ of the glass of comparative example (No.b) ₇₀be greater than 420nm.

In addition, the wavelength X of the opticglass of embodiment (No.E1 ~ No.E8) ₇₀be below 430nm.

It can thus be appreciated that the opticglass of embodiments of the invention is high relative to the transmissivity of visible ray, painted few.Especially known, for the opticglass of embodiment (No.B1 ~ No.B27), with the glassy phase ratio of comparative example (No.b), high relative to the transmissivity of visible ray, painted few.

In addition, the specific refractory power (n of the opticglass of embodiments of the invention _d) be more than 1.90, and this specific refractory power is less than 2.20, in desired scope.Especially, the specific refractory power (n of the opticglass of embodiment (No.A1 ~ No.A16, No.B1 ~ No.B27) _d) be more than 1.91.In addition, the specific refractory power (n of the opticglass of embodiment (No.C1 ~ No.C20, No.D1 ~ No.D10) _d) be more than 1.95.

In addition, the Abbe number (ν of the opticglass of embodiments of the invention _d) be less than 40, in more detail, be less than 35, and this Abbe number (ν _d) be more than 20, in desired scope.

Especially, the Abbe number (ν of the opticglass of embodiment (No.A1 ~ No.A16) _d) be less than 33.In addition, the Abbe number (ν of the opticglass of embodiment (No.C1 ~ No.C20, No.D1 ~ No.D10) _d) be less than 32.

On the other hand, the Abbe number (ν of the opticglass of embodiment (No.E1 ~ No.E8) _d) be more than 30.

It can thus be appreciated that, the specific refractory power (n of the opticglass of embodiments of the invention _d) and Abbe number (ν _d) in desired scope, and high relative to the transmissivity of visible ray.

Especially, the poor Δ T that the second-order transition temperature (Tg) of the opticglass of embodiment (No.A1 ~ No.A16) and crystallization start temperature (Tx) is more than 155 DEG C, in more detail, it is more than 163 DEG C, thus in desired scope.

On the other hand, the Δ T of the glass of comparative example (No.a) is only 151 DEG C, and the thermostability of glassy phase is low.

It can thus be appreciated that the opticglass of embodiment (No.A1 ~ No.A16) and the glassy phase ratio of comparative example (No.a), have high thermostability.

Wherein, in embodiment (No.14 ~ No.16) and comparative example (No.A), under the state that the ratio of the content by other compositions is fixing, only change Al ₂o ₃content is relative to SiO ₂the ratio of content.Mass ratio (the Al of these embodiments and comparative example will be represented ₂o ₃/ SiO ₂) with the relation of Δ T be illustrated in Fig. 1.From the figure of Fig. 1, more make mass ratio (Al ₂o ₃/ SiO ₂) increase, the Δ T of reading becomes larger.Think thus, increase mass ratio (Al ₂o ₃/ SiO ₂), be a reason that can obtain high thermostability.

Also known thus, the specific refractory power (n of the opticglass of embodiments of the invention (No.A1 ~ No.A16) _d) and Abbe number (ν _d) in desired scope, high relative to the transmissivity of visible ray, and there is high thermostability.

And then, for the opticglass of embodiments of the invention, use by HF, HClO ₄, HNO ₃, the composition such as HCl nitration mixture the glass specimen through pulverizing is decomposed, be heated evaporation, become drying solid, in the salt obtained, add nitric acid, use ICP mass spectrograph to analyze gains, determine Pt content thus.Results verification arrives, and in all embodiments, Pt is below 6ppm relative to the content of glass quality.

In addition, for the opticglass of embodiments of the invention, high energy radiation is carried out to glass specimen, carry out the analysis employing EXAFS (Extended X-ray Absorption Fine Structure), determine the Pt contained in whole platinum composition thus ²⁺ratio.Results verification arrives, in all of the embodiments illustrated, and the Pt contained in whole platinum composition ²⁺ratio be less than 80%.

Can be known by inference by foregoing, the Pt content of opticglass of the present invention is few, and the Pt contained in whole platinum composition ²⁺ratio low, this is a reason high relative to the transmissivity of visible ray in opticglass of the present invention.

Above, understand the present invention in detail for illustrative purposes, but the present embodiment is only example object, should be appreciated that when not exceeding thought of the present invention and scope, those skilled in the art can carry out multiple change.

Claims

1. an opticglass, wherein, in mass %, containing the B of 1.0 ~ 30.0% ₂o ₃composition, 35.0 ~ 65.0% La ₂o ₃composition, containing TiO ₂composition and Nb ₂o ₅in composition at least any one, the specific refractory power of described opticglass is more than 1.90, and the wavelength of transmissivity showing 70% during thick 10mm is below 470nm.

2. opticglass as claimed in claim 1, wherein, in mass %, containing the B of 5.0 ~ 30.0% ₂o ₃composition, containing the Nb adding up to 5.0 ~ 50.0% ₂o ₅composition and TiO ₂composition, Al ₂o ₃content relative to SiO ₂the ratio of content be less than more than 0.01 1.00.

3. opticglass as claimed in claim 1, wherein, in mass %, Al ₂o ₃the content of composition is 0 ~ 10.0%, SiO ₂the content of composition is 0 ~ 20.0%.

4. opticglass as claimed in claim 1, wherein, in mass %, also contains the Al of 0.1 ~ 10.0% ₂o ₃composition, 1.0 ~ 20.0% SiO ₂composition.

5. opticglass as claimed in claim 1, wherein, in mass %,

TiO ₂composition is 0 ~ 30.0%,

Nb ₂o ₅composition is 0 ~ 30.0%.

6. opticglass as claimed in claim 1, wherein, in mass %, WO ₃the content of composition is 0 ~ 20.0%.

7. opticglass as claimed in claim 1, wherein, in mass %, the content of ZnO component is 0 ~ 20.0%.

8. opticglass as claimed in claim 1, wherein, in mass %, SiO ₂composition is 1.0 ~ 20.0%, containing the ZnO component of 0.1 ~ 20.0%, the WO of 0.5 ~ 20.0% ₃composition, the wavelength showing the transmissivity of 70% during thick 10mm is below 440nm.

9. opticglass as claimed in claim 1, wherein, in mass %, containing the Nb of 4.0 ~ 30.0% ₂o ₅composition, TiO ₂the content of composition is 0 ~ 15.0%.

10. opticglass as claimed in claim 1, wherein, in mass %, containing the TiO of 10.0 ~ 30.0% ₂composition, the Nb of 4.0 ~ 20.0% ₂o ₅composition.

11. opticglass as claimed in claim 1, wherein, in mass %, containing the TiO of 10.0 ~ 30.0% ₂composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%.

12. opticglass as claimed in claim 1, wherein, in mass %, containing the TiO of 1.0 ~ 10.0% ₂composition, Nb ₂o ₅the content of composition is 0 ~ 5.0%.

13. opticglass as claimed in claim 1, wherein, mass ratio (ZnO+WO ₃)/Nb ₂o ₅be less than more than 0.20 2.00.

14. opticglass as claimed in claim 1, wherein, in mass %, containing the WO adding up to 5.5 ~ 30.0% ₃composition and Nb ₂o ₅composition.

15. opticglass as claimed in claim 1, wherein, mass ratio WO ₃/ Nb ₂o ₅be less than more than 0.10 2.00.

16. opticglass as claimed in claim 1, wherein, mass ratio WO ₃/ ZnO is less than more than 0.10 3.00.

17. opticglass as claimed in claim 1, wherein, mass ratio (WO ₃+ ZnO)/TiO ₂be less than more than 0.10 3.00.

18. opticglass as claimed in claim 1, wherein, in mass %, containing the WO adding up to 1.0 ~ 30.0% ₃composition and ZnO component.

19. opticglass as claimed in claim 1, wherein, in mass %,

Gd ₂o ₃composition is 0 ~ 20.0%,

Y ₂o ₃composition is 0 ~ 20.0%,

Yb ₂o ₃composition is 0 ~ 20.0%.

20. opticglass as claimed in claim 1, wherein, quality and Gd ₂o ₃+ Y ₂o ₃+ Yb ₂o ₃be less than 20.0%.

21. opticglass as claimed in claim 1, wherein, Ln ₂o ₃the quality of composition and be less than more than 35.0% 70.0%, Ln ₂o ₃in formula, Ln is more than a kind of being selected from La, Gd, Y, Yb.

22. opticglass as claimed in claim 1, wherein, in mass %, Ta ₂o ₅content be less than 15.0%.

23. opticglass as claimed in claim 1, wherein, in mass %,

MgO composition is 0 ~ 10.0%,

CaO composition is 0 ~ 20.0%,

SrO composition is 0 ~ 20.0%,

BaO composition is 0 ~ 20.0%.

24. opticglass as claimed in claim 1, wherein, R ¹the quality of O composition and be less than 20.0%, R ¹in O formula, R ¹for being selected from more than a kind in Mg, Ca, Sr, Ba, Zn.

25. opticglass as claimed in claim 1, wherein, R ²the quality of O composition and be less than 15.0%, R ²in O formula, R ²for being selected from more than a kind in Mg, Ca, Sr, Ba.

26. opticglass as claimed in claim 1, wherein, in mass %,

Li ₂o composition is 0 ~ 10.0%,

Na ₂o composition is 0 ~ 10.0%,

K ₂o composition is 0 ~ 10.0%.

27. opticglass as claimed in claim 1, wherein, Rn ₂the quality of O composition and be less than 10.0%, Rn ₂in O formula, Rn is more than a kind of being selected from Li, Na, K.

28. opticglass as claimed in claim 1, wherein, in mass %,

P ₂o ₅composition is 0 ~ 10.0%,

GeO ₂composition is 0 ~ 10.0%,

ZrO ₂composition is 0 ~ 20.0%,

Bi ₂o ₃composition is 0 ~ 10.0%,

TeO ₂composition is 0 ~ 10.0%,

SnO ₂composition is 0 ~ 5.0%,

Sb ₂o ₃composition is 0 ~ 1.0%.

29. opticglass as claimed in claim 1, it has the Abbe number ν d of less than more than 20 40.

30. opticglass as claimed in claim 1, wherein, Pt is below 20ppm relative to the content of glass quality, and Pt ²⁺ratio be less than 80%.

31. 1 kinds of optical elements, it is that opticglass according to any one of claims 1 to 30 is formed.

The manufacture method of 32. 1 kinds of glass forming bodies, wherein, uses the opticglass according to any one of claim 1 ~ 30, in mould, carries out extrusion forming to the described opticglass softened.