WO2011093375A1 - 光学ガラス及び光学素子 - Google Patents
光学ガラス及び光学素子 Download PDFInfo
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- WO2011093375A1 WO2011093375A1 PCT/JP2011/051589 JP2011051589W WO2011093375A1 WO 2011093375 A1 WO2011093375 A1 WO 2011093375A1 JP 2011051589 W JP2011051589 W JP 2011051589W WO 2011093375 A1 WO2011093375 A1 WO 2011093375A1
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- Prior art keywords
- glass
- optical
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/19—Silica-free oxide glass compositions containing phosphorus containing boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/17—Silica-free oxide glass compositions containing phosphorus containing aluminium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/21—Silica-free oxide glass compositions containing phosphorus containing titanium, zirconium, vanadium, tungsten or molybdenum
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
Definitions
- the present invention relates to an optical glass and an optical element. More specifically, the present invention relates to an optical glass suitable for precision press molding and an optical element made of the optical glass.
- optical elements made of optical glass such as optical pickup lenses for optical discs (CD, DVD, BD, HD-DVD, etc.) and imaging lenses mounted on mobile phones, are widely used.
- optical pickup lenses for optical discs CD, DVD, BD, HD-DVD, etc.
- imaging lenses mounted on mobile phones are widely used.
- the demand for optical elements made of such optical glass has been rapidly expanding, and the productivity and low cost of such optical elements have been increased. Is required.
- an optical element such as a glass lens
- the glass heated to a temperature higher than the yield temperature (At) is pressed using a molding die composed of a pair of heated upper and lower molds, thereby directly forming the optical element.
- a so-called press molding method for performing molding is known.
- This press molding method has fewer manufacturing steps than a conventional molding method for polishing glass, and as a result, an optical element can be manufactured in a short time and at a low cost. As it is widely used.
- This press molding method can be broadly divided into two types: reheating method and direct press method.
- reheating method gob preforms or polishing preforms having almost the final product shape are prepared, then these preforms are heated again above the softening point, and press molded with a pair of heated upper and lower molds to obtain the final product. It is a method of shape.
- the direct press system is a system in which a molten glass droplet is directly dropped from a glass melting furnace onto a heated mold and press-molded to obtain a final product shape. In any of these types of press molding methods, it is necessary to heat the press mold to a temperature near or above the glass transition temperature (Tg) when molding glass.
- Tg glass transition temperature
- a nozzle made of platinum or the like is usually used.
- the weight of the dropped glass is controlled by the temperature of this nozzle.
- the nozzle temperature can be set in a wide temperature range from high temperature to low temperature, so that it is possible to produce optical elements of various sizes from large to small. It becomes possible.
- the glass will be devitrified unless the nozzle temperature is maintained at a temperature equal to or higher than the liquidus temperature (TL). There is a problem that it is not possible.
- the glass transition temperature (Tg) When the glass transition temperature (Tg) is high, or when the glass has a high liquidus temperature (TL), the temperature of the dropped glass itself increases, resulting in surface oxidation of the press mold and changes in the metal composition. Easy and mold life is shortened. This leads to an increase in production cost. Mold deterioration can be suppressed by molding under an inert gas atmosphere such as nitrogen, but the molding equipment becomes complicated and the inert gas running cost is required to control the atmosphere. , Production costs rise. Therefore, it is desirable that the glass used in the press molding method has a glass transition temperature (Tg) and a liquidus temperature (TL) as low as possible. For example, as an optical glass having a low glass transition temperature (Tg), optical glasses having a Tg of 450 ° C. or less proposed in Patent Documents 1 to 3 can be mentioned.
- the viscosity of the molten glass When molding by the direct press method, if the viscosity of the molten glass is low, it is difficult to obtain a spherical or aspherical lens with a smooth and even curved surface. Therefore, at the time of molding, the viscosity of the molten glass must be fully studied. The glass must not be devitrified when dropped. When the viscosity of the molten glass is low, the temperature of the molten glass must be lowered in order to increase the viscosity of the molten glass. However, when the temperature is lowered, the liquidus temperature (TL) is lowered and devitrification occurs. Accordingly, it is desirable that the viscosity at the liquidus temperature (TL) is high.
- the optical glasses proposed in Patent Documents 1 to 3 have a low Tg, but have a problem that the weather resistance is not good among the chemical durability.
- the optical glasses of Patent Documents 2 and 3 also have a problem of low viscosity at the liquidus temperature (TL). Glass with poor weather resistance adversely affects the glass surface in the optical surface molding process itself by polishing or precision mold press, the cleaning process after optical surface molding, and the coating process to mold the optical thin film formed on the surface. Therefore, there arises a problem that the yield in manufacturing is lowered. A low-viscosity glass is difficult to obtain a good product during press molding.
- the present invention has been made in view of such a conventional problem, and its object is to provide a refractive index (nd) for d-line of 1.54 to 1.60 and an Abbe number ( ⁇ d) of 58. It has an optical constant of ⁇ 67, a glass transition temperature (Tg) of 420 ° C. or lower, a liquidus temperature (TL) of 800 ° C. or lower, and a viscosity at the liquidus temperature (TL) of 0.8 Pa ⁇ s or higher. It is an object of the present invention to provide an optical glass excellent in performance and precision press moldability and an optical element made of the optical glass.
- the optical glass of the first invention is P 2 O 5 : 38 to 55%, Al 2 O 3 : 1 to 10%, B 2 O 3 : 0 to 5. 5%, SiO 2 : 0 to 4%, BaO: 3 to 24.5%, SrO: 0 to 15%, CaO: 1 to 10%, ZnO: 0.5 to 14.5%, Na 2 O: 1 To 15, Li 2 O: 1 to 4%, K 2 O: 0 to 4.5%, TiO 2 : 0 to 0.4%, Ta 2 O 5 : 0 to 5%, BaO + SrO + CaO + ZnO: 25 to 39%, Na 2 O + Li 2 O + K 2 O: 5 to 20%, Al 2 O 3 + SiO 2 + CaO + Ta 2 O 5 : 9 to 18%, P 2 O 5 + B 2 O 3 + Al 2 O 3 + SiO 2 + BaO + SrO + CaO + ZnO + Na 2 O + Li 2 O + K 2 O + TiO 2 + Ta 2 O 5 : 9 to 18%
- the optical glass of the second invention is the glass transition according to the first invention, having an optical constant having a refractive index (nd) of 1.54 to 1.60 and an Abbe number ( ⁇ d) of 58 to 67.
- the temperature (Tg) is 420 ° C. or lower
- the liquid phase temperature (TL) is 800 ° C. or lower
- the viscosity at the liquid phase temperature (TL) is 0.8 Pa ⁇ s or higher.
- the optical element of the third invention is characterized by comprising the optical glass according to the first or second invention.
- Examples of such an optical element include a lens, a prism, and a mirror.
- the optical element of the fourth invention is characterized by being produced by precision press molding the optical glass according to the first or second invention.
- the refractive index can be obtained without using a compound such as PbO, CdO, As 2 O 3 , Sb 2 O 3, etc., which may cause adverse effects on the human body by containing a specific amount of a predetermined glass component.
- Nd has an optical constant of 1.54 to 1.60, Abbe number ( ⁇ d) of 58 to 67, glass transition temperature (Tg) of 420 ° C. or lower, and liquidus temperature (TL) of 800 ° C.
- Tg glass transition temperature
- TL liquidus temperature
- an optical glass having a viscosity at a liquidus temperature (TL) of 0.8 Pa ⁇ s or more and excellent weather resistance and precision press moldability can be obtained.
- the optical element of the present invention is produced by precision press molding the optical glass, high production efficiency and cost reduction can be achieved while having the characteristics of the optical glass.
- P 2 O 5 is a component (glass former) constituting the glass skeleton, and if its content is less than 38%, the glass becomes unstable and the tendency to devitrification becomes strong. On the other hand, when the content of P 2 O 5 exceeds 55%, devitrification resistance and glass stability are improved, but a desired optical constant cannot be obtained. In addition, the weather resistance is significantly deteriorated. Therefore, the content of P 2 O 5 is set in the range of 38 to 55%. A more preferable content of P 2 O 5 is in the range of 40 to 54%. The most preferred content is in the range of 42-53%.
- Al 2 O 3 has the effect of reducing the linear thermal expansion coefficient and improving the weather resistance of the glass. It also has the effect of increasing the viscosity. When the content of Al 2 O 3 is less than 1%, the above effect cannot be obtained sufficiently. On the other hand, when the content of Al 2 O 3 exceeds 10%, the glass transition temperature (Tg) becomes high and the glass becomes unstable and the tendency to devitrification increases. Therefore, the content of Al 2 O 3 is set in the range of 1 to 10%. A more preferable content is in the range of 1.5 to 9%. The most preferred content is in the range of 2-8%.
- B 2 O 3 has the effect of stabilizing the glass and reducing the linear thermal expansion coefficient.
- the content of B 2 O 3 exceeds 5.5%, the glass transition temperature (Tg) is increased, the viscosity is lowered, and the devitrification resistance may be decreased. Therefore, the content of B 2 O 3 is set in the range of 0 to 5.5%. A more preferable content is in the range of 0 to 5%. The most preferable content is in the range of 0 to 4.5%.
- SiO 2 has an effect of lowering the refractive index and an effect of improving the weather resistance, but when the content exceeds 4%, undissolved material tends to remain in the glass. For this reason, the content of SiO 2 is set to a range of 4% or less. A more preferable content is 3.5% or less. The most preferable content is 3% or less.
- BaO has the effect of lowering the glass transition temperature (Tg), increasing the refractive index, and improving the stability of the glass.
- Tg glass transition temperature
- the content of BaO is set in the range of 3 to 24.5%.
- a more preferable BaO content is in the range of 5 to 24%.
- the most preferable content is in the range of 7 to 23.5%.
- SrO has the effect of improving the stability of the glass. If the content of SrO exceeds 15%, the glass becomes unstable, the tendency to devitrification increases, and the specific gravity increases. Therefore, the SrO content is set in the range of 0 to 15%. A more preferable SrO content is in the range of 0 to 13%. The most preferred content is in the range of 0-12%.
- CaO has the effect of reducing the linear thermal expansion coefficient and improving the chemical durability and weather resistance of the glass. If the content of CaO is less than 1%, the above effect is difficult to obtain, and if it exceeds 10%, the glass transition temperature (Tg) rises, the glass becomes unstable and the tendency to devitrification increases. For this reason, the content of CaO is set in the range of 1 to 10%. A more preferable content of CaO is in the range of 3 to 9.5%. The most preferred content is in the range of 4 to 9.5%.
- ZnO has the effect of lowering the glass transition temperature (Tg) without increasing the linear thermal expansion coefficient. If the ZnO content is less than 0.5%, the effect of lowering the glass transition temperature (Tg) cannot be obtained sufficiently. On the other hand, when the content of ZnO exceeds 14.5%, the stability of the glass decreases and the tendency to devitrification increases. Therefore, the ZnO content is set in the range of 0.5 to 14.5%. A more preferable content of ZnO is in the range of 1 to 14%. The most preferred content is in the range of 2-14%.
- Li 2 O has the effect of strongly reducing the glass transition temperature (Tg).
- Tg glass transition temperature
- the content of Li 2 O is set to a range of 1 to 4%.
- a more preferable content of Li2O is in the range of 1.5 to 3.5%.
- Na 2 O has an effect of lowering the glass transition temperature (Tg) although it is inferior to the above Li 2 O.
- Tg glass transition temperature
- the content of Na 2 O is set in the range of 1 to 15%.
- a more preferable content of Na 2 O is in the range of 2 to 13%.
- the most preferred content is in the range of 2.5-12%.
- K 2 O is inferior to Li 2 O like Na 2 O, but has an effect of lowering the glass transition temperature (Tg).
- Tg glass transition temperature
- the content of K 2 O is set in the range of 0 to 4.5%.
- a more preferable content of K 2 O is in the range of 0 to 4%.
- TiO 2 has an effect of increasing the refractive index and stabilizing the glass.
- the content of TiO 2 is more than 0.4%, the Abbe number becomes small, and a desired optical constant cannot be obtained.
- the content of TiO 2 is in the range of 0 to 0.4%.
- a more preferable content is in the range of 0 to 0.3%.
- Ta 2 O 5 has the effect of adjusting the optical constant and improving the chemical durability.
- the content of Ta 2 O 5 exceeds 5%, the glass becomes unstable and the tendency to devitrification may increase. Therefore, the content of Ta 2 O 5 is set in the range of 0 to 5%.
- a more preferable content is 0 to 4%.
- the most preferred content is 0 to 3%.
- the total amount of Al 2 O 3 , SiO 2 , CaO, and Ta 2 O 5 was determined to be 9 to 18%.
- a more preferable content is 9.5 to 17%.
- the most preferred content is 10 to 16%.
- components other than the above for example, MgO, La 2 O 3 , Y 2 O 3 , Gd 2 O 3 , ZrO 2 , GeO 2 , MnO, Nb 2 O 5 , Bi 2 O 3 , WO 3, etc.
- components other than the above for example, MgO, La 2 O 3 , Y 2 O 3 , Gd 2 O 3 , ZrO 2 , GeO 2 , MnO, Nb 2 O 5 , Bi 2 O 3 , WO 3, etc.
- the total content is desirably 98.0% or more. More preferably, it is 99.0% or more, More preferably, it is 99.9% or more.
- Nb 2 O 5 , Bi 2 O 3 , and WO 3 are not substantially contained from the viewpoint of coloring. Further, MgO, La 2 O 3 , Y 2 O 3 , Gd 2 O 3 , ZrO 2 , and GeO 2 are not substantially contained from the viewpoint of devitrification resistance.
- PbO, CdO, As 2 O 3 , TeO 2 , and fluoride are preferably free from any components from the viewpoint of ensuring the safety of workers in consideration of the working environment during production.
- the refractive index (nd) can be reduced without using a compound such as PbO, CdO, As 2 O 3 , Sb 2 O 3, etc., which may cause adverse effects on the human body. It has an optical constant of 1.54 to 1.60, Abbe number ( ⁇ d) of 58 to 67, glass transition temperature (Tg) of 420 ° C. or lower, liquidus temperature (TL) of 800 ° C. or lower, liquid phase An optical glass having a viscosity at a temperature (TL) of 0.8 Pa ⁇ s or more and excellent weather resistance and precision press moldability can be realized. The low liquidus temperature (TL) makes it difficult for devitrification to occur, and stable dripping can be performed.
- a compound such as PbO, CdO, As 2 O 3 , Sb 2 O 3, etc.
- the low glass transition temperature (Tg) can lower the temperature of the press mold, thereby extending the mold life and reducing the production cost. Further, due to the high viscosity at the liquidus temperature (TL), the ratio of non-defective products during press molding increases, and productivity can be improved.
- the optical glass according to the present invention is used as a material for an optical element (lens, prism, mirror, etc.) mounted on an optical device such as a digital camera or a camera-equipped mobile phone, the optical property is improved by improving weather resistance and precision press formability. Since it is possible to improve the productivity of the element and reduce the cost, it is possible to contribute to the cost reduction of the optical device.
- the optical element of the present invention is produced by precision press molding the optical glass.
- this precision press molding method includes a direct press molding method in which molten glass is dropped from a nozzle onto a mold heated to a predetermined temperature and press molded, and a preform material is placed on the mold.
- a reheating molding method in which the glass is softened to a temperature above the glass softening point and press molded. According to such a method, a grinding / polishing step is not required, productivity is improved, and an optical element having a difficult shape such as a free curved surface or an aspherical surface can be obtained. Therefore, cost reduction can be achieved.
- Comparative Example 1 is an Example 12 of Patent Document 1
- Comparative Example 2 is an Example 11 of Patent Document 2
- Comparative Example 3 is an Example 9 of Patent Document 3.
- the glass raw materials are prepared so that the target compositions (mass%) shown in Tables 1 to 4 are obtained, and mixed thoroughly with powder. And used as a blended raw material. This was put into a melting furnace heated to 800 to 1300 ° C., melted and clarified, stirred and homogenized, cast into a preheated iron mold, and gradually cooled to manufacture each sample. For each of these samples, the refractive index (nd), Abbe number ( ⁇ d), glass transition temperature (Tg), liquidus temperature (TL) and viscosity with respect to the d-line were measured. Moreover, the weather resistance test was implemented with the weather resistance tester. The measurement results are shown in Tables 1 to 4.
- Refractive index (nd) and Abbe number ( ⁇ d) As described above, the glass melted and poured into the mold was gradually cooled at ⁇ 2.3 ° C./hour. The sample was measured using “KPR-2000” manufactured by Kalnew Optical Industry Co., Ltd.
- Tg Glass transition temperature
- Liquid phase temperature In the measurement of the liquid phase temperature (TL), a molten glass poured into a mold in a devitrification test furnace having a temperature gradient of 800 to 1400 ° C. was held for 12 hours, and then the glass was cooled to room temperature and manufactured by Olympus The inside of the glass was observed using a 40 ⁇ magnification of an optical microscope (BX50). The temperature at which devitrification (crystals) was not confirmed inside the glass was defined as the liquidus temperature (TL).
- Viscosity Using a high temperature viscosity measuring device “TVE-20H” manufactured by Tokimec Co., Ltd., viscosity (Pa ⁇ s) at TL was measured.
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Abstract
Description
上記説明のように、溶融し鋳型に流し込んだガラスを-2.3℃/時間で徐冷した。そのサンプルの測定を、カルニュー光学工業社製「KPR-2000」を用いて行った。
セイコーインスツルメンツ社製の熱機械的分析装置「TMA/SS6000」を用いて、毎分10℃の昇温条件で測定を行った。
液相温度(TL)の測定では、800~1400℃の温度勾配を有する失透試験炉内に溶融ガラスを鋳型に流し込んだものを12時間保持した後、ガラスを室温まで冷却し、オリンパス社製の光学顕微鏡(BX50)の倍率40倍を用いてガラス内部を観察した。そして、そのガラス内部に失透(結晶)が確認されない温度を液相温度(TL)とした。
トキメック社製の高温粘度測定装置「TVE-20H」を用いて、TLでの粘性(Pa・s)を測定した。
エスペック社製の環境試験器「SH-641」を用いて、各サンプルを温度60℃、湿度95%の恒温恒湿槽において168時間保持した。その後、オリンパス社製の光学顕微鏡「BX50」を用いて各サンプルの表面を観察した。光学顕微鏡の倍率は40倍とした。表1~4では、光学顕微鏡による観察の結果、表面にくもりや析出、溶け等の変化が見られなかった場合(耐候性が良好な場合)は「○」、表面にくもりや析出、溶け等の変化が確認された場合(耐候性に問題がある場合)は「×」と記した。
Claims (4)
- 質量%で、
P2O5:38~55%、
Al2O3:1~10%、
B2O3:0~5.5%、
SiO2:0~4%、
BaO:3~24.5%、
SrO:0~15%、
CaO:1~10%、
ZnO:0.5~14.5%、
Na2O:1~15、
Li2O:1~4%、
K2O:0~4.5%、
TiO2:0~0.4%、
Ta2O5:0~5%、
BaO+SrO+CaO+ZnO:25~39%、
Na2O+Li2O+K2O:5~20%、
Al2O3+SiO2+CaO+Ta2O5:9~18%、
P2O5+B2O3+Al2O3+SiO2+BaO+SrO+CaO+ZnO+Na2O+Li2O+K2O+TiO2+Ta2O5:98%以上、
の各ガラス成分を有することを特徴とする光学ガラス。 - 屈折率(nd)が1.54~1.60、かつ、アッベ数(νd)が58~67の光学恒数を持ち、ガラス転移温度(Tg)が420℃以下、液相温度(TL)が800℃以下、液相温度(TL)での粘性が0.8Pa・s以上であることを特徴とする請求項1記載の光学ガラス。
- 請求項1又は2記載の光学ガラスから成ることを特徴とする光学素子。
- 請求項1又は2記載の光学ガラスを精密プレス成形して作製されたものであることを特徴とする光学素子。
Priority Applications (2)
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US13/576,156 US20120309606A1 (en) | 2010-01-28 | 2011-01-27 | Optical Glass and Optical Element |
JP2011551897A JPWO2011093375A1 (ja) | 2010-01-28 | 2011-01-27 | 光学ガラス及び光学素子 |
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JP2010-016538 | 2010-01-28 | ||
JP2010016538 | 2010-01-28 |
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Cited By (1)
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WO2018105279A1 (ja) * | 2016-12-07 | 2018-06-14 | 株式会社 オハラ | 光学ガラス、プリフォーム及び光学素子 |
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CN106698932B (zh) * | 2016-11-28 | 2020-06-09 | 湖北新华光信息材料有限公司 | 磷酸盐光学玻璃及其制备方法和光学元件 |
US11667561B2 (en) * | 2018-11-26 | 2023-06-06 | Corning Incorporated | Glass material with a high index of refraction |
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JP2006248850A (ja) * | 2005-03-11 | 2006-09-21 | Sumita Optical Glass Inc | 近赤外吸収フィルタ用ガラス |
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JP2004262703A (ja) * | 2003-02-28 | 2004-09-24 | Minolta Co Ltd | 光学ガラス及び光学素子 |
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2011
- 2011-01-27 WO PCT/JP2011/051589 patent/WO2011093375A1/ja active Application Filing
- 2011-01-27 JP JP2011551897A patent/JPWO2011093375A1/ja not_active Withdrawn
- 2011-01-27 US US13/576,156 patent/US20120309606A1/en not_active Abandoned
Patent Citations (4)
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JP2002211949A (ja) * | 2001-01-12 | 2002-07-31 | Minolta Co Ltd | プレス成形用光学ガラス、プレス成形用プリフォーム材およびこれを用いた光学素子 |
JP2005053743A (ja) * | 2003-08-05 | 2005-03-03 | Minolta Co Ltd | 光学ガラス及び光学素子 |
JP2005320178A (ja) * | 2004-05-06 | 2005-11-17 | Isuzu Seiko Glass Kk | 近赤外線カットガラス |
JP2006248850A (ja) * | 2005-03-11 | 2006-09-21 | Sumita Optical Glass Inc | 近赤外吸収フィルタ用ガラス |
Cited By (4)
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CN110114321A (zh) * | 2016-12-07 | 2019-08-09 | 株式会社小原 | 光学玻璃、预成形体以及光学元件 |
JPWO2018105279A1 (ja) * | 2016-12-07 | 2019-10-24 | 株式会社オハラ | 光学ガラス、プリフォーム及び光学素子 |
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