JP2005239506A - Optical glass and optical glass lens - Google Patents

Optical glass and optical glass lens Download PDF

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JP2005239506A
JP2005239506A JP2004054032A JP2004054032A JP2005239506A JP 2005239506 A JP2005239506 A JP 2005239506A JP 2004054032 A JP2004054032 A JP 2004054032A JP 2004054032 A JP2004054032 A JP 2004054032A JP 2005239506 A JP2005239506 A JP 2005239506A
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weight
glass
parts
lens
optical glass
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JP4469634B2 (en
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Takashi Tsutsumi
高志 堤
Hiromi Takeshita
裕己 竹下
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OMG Co Ltd Japan
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    • 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
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths

Abstract

<P>PROBLEM TO BE SOLVED: To provide lightweight optical glass having a high refractive index and an excellent Abbe's number and whose light transmittance in a visible region is improved, and to provide an optical glass lens obtained by using the glass. <P>SOLUTION: The optical glass has a composition of, by weight, 1 to 6% SiO<SB>2</SB>, 16 to 25% B<SB>2</SB>O<SB>3</SB>, 13 to 20% CaO, 1 to 8% ZrO<SB>2</SB>, 20 to 29% La<SB>2</SB>O<SB>3</SB>, 13 to 16% TiO<SB>2</SB>, 10 to 20% Nb<SB>2</SB>O<SB>5</SB>, 0.01 to 1% SnO and 0.01 to 1% Sb<SB>2</SB>O<SB>3</SB>. The glass is used for an optical glass lens. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、低比重、高屈折率で優れたアッベ数の光学ガラス及び光学ガラスレンズであって、可視領域の光透過率を向上させた光学ガラス及び光学ガラスレンズに関するものである。   The present invention relates to an optical glass and an optical glass lens having a low specific gravity and a high refractive index and an excellent Abbe number, and relates to an optical glass and an optical glass lens having improved light transmittance in the visible region.

光学ガラスは、カメラや望遠鏡等のレンズに使用されており、このレンズの薄型化を図るための高屈折率レンズが望まれている。高屈折率レンズを得るためには、ガラス内に鉛を含有させることによって実現することが可能であるが、比重の大きい鉛を使用することは、ガラスレンズ自体の比重も大きくなることになってしまい、その上、ガラスレンズの可視領域の短波長側の光透過率が減少する欠点があった。また、鉛自体は有害で環境への悪影響を与えるものであり、ガラスをレンズに加工する段階で生じたガラスカレット等から、鉛が溶け出すおそれがあるため、可能な限り鉛を使用しないガラスレンズが提供されることが望まれる。   Optical glass is used in lenses such as cameras and telescopes, and a high refractive index lens for reducing the thickness of this lens is desired. In order to obtain a high refractive index lens, it can be realized by including lead in the glass. However, using lead having a large specific gravity increases the specific gravity of the glass lens itself. In addition, there is a drawback that the light transmittance on the short wavelength side of the visible region of the glass lens is reduced. In addition, lead itself is harmful and has an adverse effect on the environment, and there is a risk of lead melting out from the glass cullet, etc. generated during the processing of glass into lenses, so glass lenses that do not use lead as much as possible Is desired to be provided.

鉛を使用せずに高屈折率を図ったガラスレンズは、例えば、特許文献１に開示されている。
特開２０００‐１２８５７０号公報 A glass lens having a high refractive index without using lead is disclosed in, for example, Patent Document 1.
JP 2000-128570 A

特許文献1には、ＳｉＯ２が２〜１０重量％、Ｂ２Ｏ３が１８〜３０重量％、ＣａＯが５〜２７重量％、ＺｒＯ２が１５重量％以下、Ｌａ２Ｏ３が２７〜３８重量％、ＴｉＯ２が１５〜３２重量％、Ｎｂ２Ｏ５が２０重量％以下、Ｓｂ２Ｏ３が１重量％以下の組成からなる光学用ガラスが開示され。屈折率ｎｄが１．８４以上で、比重が４未満の鉛を使用していない高屈折率光学ガラスが開示されている。 Patent Document 1 discloses that SiO 2 is 2 to 10% by weight, B 2 O 3 is 18 to 30% by weight, CaO is 5 to 27% by weight, ZrO 2 is 15% by weight or less, and La 2 O 3 is 27 to 38%. An optical glass having a composition of 10% by weight, 15 to 32% by weight of TiO 2 , 20% by weight or less of Nb 2 O 5 and 1% by weight or less of Sb 2 O 3 is disclosed. A high refractive index optical glass that does not use lead having a refractive index nd of 1.84 or more and a specific gravity of less than 4 is disclosed.

しかしながら、特許文献１に開示されている光学ガラスは、ガラスに含まれる鉄等の不純物によって着色し易く、その上、可視光線を吸収し易いガラスである。   However, the optical glass disclosed in Patent Document 1 is a glass that is easy to be colored by impurities such as iron contained in the glass and that is easy to absorb visible light.

また、ガラスは、ガラス原料を高温下で溶融する工程を経て製造されるが、化学的に安定な白金からなる坩堝を使用してガラス原料を溶融しても、溶融条件によっては、ガラス内に白金が混入し、白金インクルージョンが生じてしまう。白金インクルージョンが生じたガラスは、ガラスの着色及び可視光線の吸収をもたらす要因となる。   Glass is manufactured through a process of melting a glass raw material at a high temperature, but even if a glass raw material is melted using a chemically stable platinum crucible, depending on the melting conditions, Platinum is mixed in and platinum inclusion occurs. The glass in which the platinum inclusion occurs is a factor that causes the coloring of the glass and the absorption of visible light.

上述の事情に鑑み、本発明は、鉛を使用せずに軽量、高屈折率及び優れたアッベ数の光学ガラスレンズを実現するガラスであって、ガラス内に存在する不純物によるガラスの着色を抑制すると共に、可視領域の光透過率を向上させた光学ガラス及びこのガラスを使用した光学ガラスレンズを提供することを目的とするものである。   In view of the above circumstances, the present invention is a glass that realizes an optical glass lens having a light weight, a high refractive index, and an excellent Abbe number without using lead, and suppresses coloring of the glass due to impurities present in the glass. In addition, an object of the present invention is to provide an optical glass having an improved light transmittance in the visible region and an optical glass lens using the glass.

本発明は、ＳｉＯ２が１〜６重量％、Ｂ２Ｏ３が１６〜２５重量％、ＣａＯが１３〜２０重量％、ＺｒＯ２が１〜８重量％、Ｌａ２Ｏ３が２０〜２９重量％、ＴｉＯ２が１３〜１６重量％、Ｎｂ２Ｏ５が１０〜２０重量％、ＳｎＯが０．０１〜１重量％、Ｓｂ２Ｏ３が０．０１〜１重量％の組成からなることを特徴とする光学用ガラスである。このガラスにおける組成物の重量濃度は、ガラス原料から導き出される重量濃度である。 In the present invention, SiO 2 is 1 to 6% by weight, B 2 O 3 is 16 to 25% by weight, CaO is 13 to 20% by weight, ZrO 2 is 1 to 8% by weight, and La 2 O 3 is 20 to 29% by weight. %, TiO 2 is 13 to 16% by weight, Nb 2 O 5 is 10 to 20% by weight, SnO is 0.01 to 1% by weight, and Sb 2 O 3 is 0.01 to 1% by weight. It is the optical glass characterized. The weight concentration of the composition in the glass is a weight concentration derived from the glass raw material.

また前記ガラスは、９９．９９５重量％以上の高純度ガラス原料を使用して製造されたものであることが好適である。   The glass is preferably produced using a high purity glass raw material of 99.995% by weight or more.

前記光学ガラスには、ＢａＯ及び／又はＫ２Ｏが含有されていても良い。含有量としては、ＢａＯが２重量％以下、Ｋ２Ｏが２重量％以下であることが好ましく、更に好ましくは、ＢａＯが０．０１〜１重量％、Ｋ２Ｏが０．０１〜１重量％である。 The optical glass may contain BaO and / or K 2 O. The content is preferably 2% by weight or less for BaO and 2% by weight or less for K 2 O, more preferably 0.01 to 1% by weight for BaO and 0.01 to 1% for K 2 O. %.

前記光学ガラスは、光学レンズに使用することが可能なガラスである。   The optical glass is glass that can be used for an optical lens.

上記構成の発明によれば、比重が４以下であって、高屈折率かつ優れたアッベ数を発揮し、ガラスの着色を抑制して演色性を防止すると共に、可視領域の光透過率を向上させた光学ガラス又は光学ガラスレンズを実現することができる。   According to the invention of the above configuration, the specific gravity is 4 or less, exhibits a high refractive index and an excellent Abbe number, suppresses coloration of the glass to prevent color rendering, and improves the light transmittance in the visible region. An optical glass or an optical glass lens can be realized.

また９９．９９５重量％以上の高純度ガラス原料を使用して製造した場合には、ガラスレンズ厚が１０ｍｍの場合における波長３６５ｎｍ以上の光透過率が５％以上、波長４１０ｎｍ以上の光透過率が７０％以上となる可視領域の光透過率が高いガラスレンズを達成することが可能な光学ガラス又は光学ガラスレンズを実現することができる。   Further, when manufactured using a high-purity glass raw material of 99.995% by weight or more, when the glass lens thickness is 10 mm, the light transmittance at a wavelength of 365 nm or more is 5% or more, and the light transmittance at a wavelength of 410 nm or more. An optical glass or an optical glass lens capable of achieving a glass lens having a high light transmittance in the visible region of 70% or more can be realized.

本発明に係る光学ガラスは、純度が９９．９９５重量％以上の高純度の金属酸化物、炭酸塩や硝酸塩等のガラス原料を調合し、白金坩堝等の溶融容器内で、１３００〜１４００℃の温度で調合したガラス原料を溶融及び脱泡を行った後、攪拌して均質化を行い、次いで、１２００〜１３００℃の温度で、鋳型に流し込んで、アニ−ルを行うことで得られる。このガラスを所定寸法にカット後、表面を研磨することで本発明のガラスレンズを得ることができる。   The optical glass according to the present invention is prepared by preparing a high-purity metal oxide having a purity of 99.995% by weight or more, a glass raw material such as carbonate or nitrate, and in a melting vessel such as a platinum crucible at 1300 to 1400 ° C. After melting and defoaming the glass raw material prepared at the temperature, it is homogenized by stirring, and then poured into a mold at a temperature of 1200 to 1300 ° C. and annealed. The glass lens of the present invention can be obtained by polishing the surface after cutting the glass into a predetermined size.

本発明の光学ガラスの各組成の濃度は、ガラス原料から計算される濃度である。例えば、ガラスの一組成であるＣａＯの濃度は、ＣａＣＯ３を原料にした場合、このＣａＣＯ３から生じるＣａＯをもとに計算される。 The density | concentration of each composition of the optical glass of this invention is a density | concentration calculated from a glass raw material. For example, the concentration of CaO, which is one composition of glass, is calculated based on CaO generated from CaCO 3 when CaCO 3 is used as a raw material.

本発明に係る光学ガラスは、ＳｉＯ２が１〜６重量％、Ｂ２Ｏ３が１６〜２５重量％、ＣａＯが１３〜２０重量％、ＺｒＯ２が１〜８重量％、Ｌａ２Ｏ３が２０〜２９重量％、ＴｉＯ２が１３〜１６重量％、Ｎｂ２Ｏ５が １０〜２０重量％、ＳｎＯが０．０１〜１重量％、Ｓｂ２Ｏ３が０．０１〜１重量％の組成からなることを特徴とする光学用ガラスである。 In the optical glass according to the present invention, SiO 2 is 1 to 6% by weight, B 2 O 3 is 16 to 25% by weight, CaO is 13 to 20% by weight, ZrO 2 is 1 to 8% by weight, and La 2 O 3 is 20-29 wt%, TiO 2 is 13 to 16 wt%, Nb 2 O 5 is 10 to 20 wt%, SnO 0.01 to 1 wt%, the composition Sb 2 O 3 is 0.01 to 1 wt% An optical glass comprising:

このガラスには、ＢａＯ及び／又はＫ２Ｏが含有されていても良い。ＢａＯ及び／又はＫ２Ｏがガラス原料溶融時に含有されていれば、溶融ガラスの粘性を低下させるので、高い生産効率を発揮することになる。 This glass may contain BaO and / or K 2 O. If BaO and / or K 2 O is contained when the glass raw material is melted, the viscosity of the molten glass is lowered, so that high production efficiency is exhibited.

前記ガラスにおいて、ＳｉＯ２は、１重量％以上５重量％未満であることが好適である。この範囲濃度範囲であれば、ガラス溶融温度を一層低温とすることができ、白金インクルージョンを大きく抑制することができる。 In the glass, SiO 2 is preferably 1% by weight or more and less than 5% by weight. If it is this range concentration range, glass melting temperature can be made still lower temperature and platinum inclusion can be suppressed greatly.

Ｂ２Ｏ３が前記濃度範囲以内であれば、低温でガラス原料を溶融することができる。Ｂ２Ｏ３の濃度が２５重量％を超える場合、ガラスの屈折率が１．８に満たないガラスとなってしまう。 If B 2 O 3 is within the concentration range, the glass raw material can be melted at a low temperature. When the concentration of B 2 O 3 exceeds 25% by weight, the glass has a refractive index of less than 1.8.

ＣａＯは、１６重量％を超える濃度であることが好適である。ＣａＯをガラス組成に導入するための原料にＣａＣＯ３を使用した場合、製造されるガラスの脱泡が良い。 The concentration of CaO is preferably over 16% by weight. When CaCO 3 is used as a raw material for introducing CaO into the glass composition, defoaming of the produced glass is good.

ＺｒＯ２は、７重量％に達すると製造されるガラスの失透が生じることがあり、７重量％未満であることが好ましい。Ｌａ２Ｏ３は、好ましくは２７重量％未満の濃度であることが好ましい。２７重量％以上の濃度であれば、ガラスが失透することがある。 When ZrO 2 reaches 7% by weight, devitrification of the produced glass may occur, and is preferably less than 7% by weight. La 2 O 3 is preferably in a concentration of less than 27% by weight. If the concentration is 27% by weight or more, the glass may be devitrified.

ＴｉＯ２は、ガラス溶融温度を低下させて白金インクルージョン発生を一層抑制する場合には、１５重量％未満であることが好ましい。 TiO 2 is preferably less than 15% by weight when the glass melting temperature is lowered to further suppress the occurrence of platinum inclusion.

Ｓｂ２Ｏ３は、０．０５重量％未満であることが好適である。０．０５重量％以上の濃度であれば、Ｓｂ２Ｏ３を含有しないときと比較して可視領域の光透過率は高いものの、Ｓｂ２Ｏ３が０．０５重量％未満の含有量に比べて可視光線の透過率が減少する傾向にある。Ｓｂ２Ｏ３の濃度は、０．０３重量％であることが最適であり、この場合のＳｎＯの濃度は、０．０３重量％であることが最適である。 Sb 2 O 3 is preferably less than 0.05% by weight. If the concentration of more than 0.05 wt%, although the light transmittance in the visible region as compared to the case containing no Sb 2 O 3 content of high, Sb 2 O 3 is compared with the content of less than 0.05 wt% As a result, the transmittance of visible light tends to decrease. The concentration of Sb 2 O 3 is optimally 0.03% by weight, and the concentration of SnO in this case is optimally 0.03% by weight.

ＢａＯは、２重量％以下であると良く、好ましくは、０．０１〜１重量％である。また、Ｋ２Ｏも、２重量％以下であると良く、好ましくは、０．０１〜１重量％である。 BaO may be 2% by weight or less, and preferably 0.01 to 1% by weight. Further, K 2 O is also well to be 2 wt% or less, preferably, 0.01 to 1 wt%.

以下、実施例に基づいて本発明を具体的に説明する。実施例及び比較例における光学ガラスレンズは、次の通りにして製造した。白金坩堝内に投入された調合したガラス原料をＳｉＣ発熱体の電気炉で１３００〜１４００℃の温度範囲で溶融及び泡切りし、十分攪拌して均質化した後、この溶融ガラスを１２００〜１３００℃の温度でカーボン性の鋳型に流し込み、次いで、アニールすることによってガラス内の歪みを除去した。その後、所定の厚みにカット及び研磨することで実施例及び比較例のガラスレンズを製造した。なお、実施例及び比較例のガラスは、共に純度が９９．９９５重量％以上の高純度ガラス原料を使用して製造した。   Hereinafter, the present invention will be specifically described based on examples. The optical glass lenses in Examples and Comparative Examples were manufactured as follows. The prepared glass raw material charged in the platinum crucible was melted and bubbled in a temperature range of 1300 to 1400 ° C. in a SiC heating element electric furnace, homogenized with sufficient stirring, and then the molten glass was heated to 1200 to 1300 ° C. The distortion in the glass was removed by pouring into a carbon mold at the temperature of Then, the glass lens of an Example and a comparative example was manufactured by cutting and grind | polishing to predetermined thickness. In addition, both the glass of an Example and a comparative example was manufactured using the high purity glass raw material whose purity is 99.995 weight% or more.

実施例及び比較例のガラスレンズに使用したガラス原料及び製造したガラスレンズの厚みは、以下の通りである。   The glass raw material used for the glass lens of an Example and a comparative example and the thickness of the manufactured glass lens are as follows.

（実施例１）
（１）ガラス原料
ＳｉＯ２：３．９８重量部、Ｈ３ＢＯ３：３５．５１重量部、ＣａＣＯ３：２８．９６重量部、ＢａＣＯ３：０．１０重量部、ＺｒＯ２：５．１９重量部、Ｌａ２Ｏ３：２６．４５重量部、ＴｉＯ２：１３．９７重量部、Ｎｂ２Ｏ５：１３．９７重量部、Ｋ２ＣＯ３：０．１０重量部、ＳｎＯ：０．０３重量部、Ｓｂ２Ｏ３：０．０３重量部
（２）ガラスレンズ厚 １０ｍｍ
（実施例２）
（１）ガラス原料
ＳｉＯ２：４．００重量部、Ｈ３ＢＯ３：３５．６０重量部、ＣａＣＯ３：２８．８７重量部、ＢａＣＯ３：０．１３重量部、ＺｒＯ２：５．８重量部、Ｌａ２Ｏ３：２５．９０重量部、ＴｉＯ２：１４．１０重量部、Ｎｂ２Ｏ５：１３．８７重量部、Ｋ２ＣＯ３：０．１０重量部、ＳｎＯ：０．０３重量部、Ｓｂ２Ｏ３：０．０３重量部
（２）ガラスレンズ厚 １０ｍｍ
（実施例３）
（１）ガラス原料
ＳｉＯ２：４．１７重量部、Ｈ３ＢＯ３：３５．６０重量部、ＣａＣＯ３：２８．６６重量部、ＺｒＯ２：６．１４重量部、Ｌａ２Ｏ３：２５．５８重量部、ＴｉＯ２：１４．１７重量部、Ｎｂ２Ｏ５：１３．７７重量部、ＳｎＯ：０．０３重量部、Ｓｂ２Ｏ３：０．０３重量部
（２）ガラスレンズ厚 １０ｍｍ
（比較例１）
（１）ガラス原料
ＳｉＯ２：４．００重量部、Ｈ３ＢＯ３：３５．６０重量部、ＣａＣＯ３：２９．０１重量部、ＺｒＯ２：５．２重量部、Ｌａ２Ｏ３：２６．５重量部、ＴｉＯ２：１４．００重量部、Ｎｂ２Ｏ５：１４．００重量部
（２）ガラスレンズ厚 ７．６ｍｍ
(比較例２)
（１）ガラス原料
ＳｉＯ２：６．００重量部、Ｈ３ＢＯ３：３１．１５重量部、ＣａＣＯ３：２８．４８重量部、ＺｒＯ２：５．５０重量部、Ｌａ２Ｏ３：２８．００重量部、ＴｉＯ２：１４．００重量部、Ｎｂ２Ｏ５：１３．００重量部
（２）ガラスレンズ厚 １０ｍｍ
次表１に実施例及び比較例のガラスレンズ組成を示す。実施例のガラスレンズについては、測定した屈折率（ｎｄ）及びアッベ数（νｄ）についても表１に示す。なお、実施例１〜３のガラスレンズの比重は、４以下であった。 (Example 1)
(1) Glass raw material SiO 2 : 3.98 parts by weight, H 3 BO 3 : 35.51 parts by weight, CaCO 3 : 28.96 parts by weight, BaCO 3 : 0.10 parts by weight, ZrO 2 : 5.19 parts by weight Parts, La 2 O 3 : 26.45 parts by weight, TiO 2 : 13.97 parts by weight, Nb 2 O 5 : 13.97 parts by weight, K 2 CO 3 : 0.10 parts by weight, SnO: 0.03 parts by weight Part, Sb 2 O 3 : 0.03 part by weight (2) Glass lens thickness 10 mm
(Example 2)
(1) Glass raw material SiO 2 : 4.00 parts by weight, H 3 BO 3 : 35.60 parts by weight, CaCO 3 : 28.87 parts by weight, BaCO 3 : 0.13 parts by weight, ZrO 2 : 5.8 parts by weight Parts, La 2 O 3 : 25.90 parts by weight, TiO 2 : 14.10 parts by weight, Nb 2 O 5 : 13.87 parts by weight, K 2 CO 3 : 0.10 parts by weight, SnO: 0.03 parts by weight Part, Sb 2 O 3 : 0.03 part by weight (2) Glass lens thickness 10 mm
(Example 3)
(1) Glass raw material SiO 2 : 4.17 parts by weight, H 3 BO 3 : 35.60 parts by weight, CaCO 3 : 28.66 parts by weight, ZrO 2 : 6.14 parts by weight, La 2 O 3 : 25. 58 parts by weight, TiO 2 : 14.17 parts by weight, Nb 2 O 5 : 13.77 parts by weight, SnO: 0.03 parts by weight, Sb 2 O 3 : 0.03 parts by weight (2) Glass lens thickness 10 mm
(Comparative Example 1)
(1) Glass raw material SiO 2 : 4.00 parts by weight, H 3 BO 3 : 35.60 parts by weight, CaCO 3 : 29.01 parts by weight, ZrO 2 : 5.2 parts by weight, La 2 O 3 : 26. 5 parts by weight, TiO 2 : 14.00 parts by weight, Nb 2 O 5 : 14.00 parts by weight (2) Glass lens thickness 7.6 mm
(Comparative Example 2)
(1) Glass raw material SiO 2 : 6.00 parts by weight, H 3 BO 3 : 31.15 parts by weight, CaCO 3 : 28.48 parts by weight, ZrO 2 : 5.50 parts by weight, La 2 O 3 : 28. 00 parts by weight, TiO 2 : 14.00 parts by weight, Nb 2 O 5 : 13.00 parts by weight (2) Glass lens thickness 10 mm
Table 1 below shows the glass lens compositions of Examples and Comparative Examples. Table 1 also shows the measured refractive index (nd) and Abbe number (νd) for the glass lenses of the examples. The specific gravity of the glass lenses of Examples 1 to 3 was 4 or less.

Figure 2005239506
次表２に実施例及び比較例のガラスレンズについて、分光光度計で測定した透過率の結果を示す。なお、図１は、実施例１のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。図２は、実施例２のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。図３は、実施例３のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。
Figure 2005239506
 Table 2 below shows the results of transmittance measured with a spectrophotometer for the glass lenses of Examples and Comparative Examples. FIG. 1 is a graph comparing the transmittance measurement results of the glass lens of Example 1 and the glass lens of Comparative Example 1. FIG. 2 is a graph comparing the transmittance measurement results of the glass lens of Example 2 and the glass lens of Comparative Example 1. FIG. 3 is a graph comparing the transmittance measurement results of the glass lens of Example 3 and the glass lens of Comparative Example 1.

Figure 2005239506
表２から、実施例１〜３のレンズは、比較例１のレンズよりもレンズ厚が大きいにもかかわらず、波長３８０ｎｍ以上の光透過率が比較例１のレンズよりも高い透過率を示していた。また、実施例１〜３のガラスレンズは、３６０〜５００ｎｍの波長光の透過率が比較例２のガラスレンズよりも高透過率であった。また実施例１〜３のガラスレンズは、波長３６５ｎｍ以上の光透過率が５％以上、波長４１０ｎｍ以上の光透過率が７０％以上となる可視領域の光透過率が高いガラスレンズであることが確認されたことになる。即ち、実施例１〜３のガラスレンズは着色度に優れたガラスレンズであることが確認されたことになる。
Figure 2005239506
 From Table 2, the lenses of Examples 1 to 3 have a light transmittance of a wavelength of 380 nm or more higher than that of the lens of Comparative Example 1 although the lens thickness is larger than that of the lens of Comparative Example 1. It was. In addition, the glass lenses of Examples 1 to 3 had a transmittance of 360 to 500 nm wavelength light higher than that of the glass lens of Comparative Example 2. The glass lenses of Examples 1 to 3 are glass lenses having high light transmittance in the visible region in which the light transmittance at a wavelength of 365 nm or more is 5% or more and the light transmittance at a wavelength of 410 nm or more is 70% or more. It has been confirmed. In other words, it was confirmed that the glass lenses of Examples 1 to 3 were glass lenses having an excellent coloring degree.

実施例１のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。It is the graph which compared the transmittance | permeability measurement result of the glass lens of Example 1, and the glass lens of the comparative example 1. FIG. 実施例２のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。It is the graph which compared the transmittance | permeability measurement result of the glass lens of Example 2, and the glass lens of the comparative example 1. FIG. 実施例３のガラスレンズと比較例１のガラスレンズの透過率測定結果を比較したグラフである。It is the graph which compared the transmittance | permeability measurement result of the glass lens of Example 3, and the glass lens of the comparative example 1. FIG.

Claims (4)

ＳｉＯ２が１〜６重量％、Ｂ２Ｏ３が１６〜２５重量％、ＣａＯが１３〜２０重量％、ＺｒＯ２が１〜８重量％、Ｌａ２Ｏ３が２０〜２９重量％、ＴｉＯ２が１３〜１６重量％、Ｎｂ２Ｏ５が１０〜２０重量％、ＳｎＯが０．０１〜１重量％、Ｓｂ２Ｏ３が０．０１〜１重量％の組成からなることを特徴とする光学用ガラス。 SiO 2 is 1 to 6 wt%, B 2 O 3 is 16 to 25 wt%, CaO is 13 to 20 wt%, ZrO 2 1 to 8 wt%, La 2 O 3 is 20-29 wt%, TiO 2 Is composed of 13 to 16% by weight, Nb 2 O 5 is 10 to 20% by weight, SnO is 0.01 to 1% by weight, and Sb 2 O 3 is 0.01 to 1% by weight. Glass. 前記ガラスは、９９．９９５重量％以上の高純度ガラス原料を使用して製造されたものである請求項１に記載の光学ガラス。 The optical glass according to claim 1, wherein the glass is manufactured using a high-purity glass raw material of 99.995 wt% or more. 前記ガラスは、ＢａＯ及び／又はＫ２Ｏを２重量％以下含有する請求項１又は２に記載のガラス。 The glass according to claim 1 or 2, wherein the glass contains 2% by weight or less of BaO and / or K 2 O. 請求項１〜３のいずれかに記載されたガラスを使用したレンズ。
A lens using the glass according to claim 1.
JP2004054032A 2004-02-27 2004-02-27 Optical glass and optical glass lens Expired - Fee Related JP4469634B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010083702A (en) * 2008-09-30 2010-04-15 Hoya Corp Optical glass, glass gob for press forming and optical element
JP2010215444A (en) * 2009-03-16 2010-09-30 Nippon Electric Glass Co Ltd Optical glass
US8187986B2 (en) 2006-10-24 2012-05-29 Ohara Inc. Optical glass
JP2016121034A (en) * 2014-12-24 2016-07-07 株式会社オハラ Optical glass, preform and optical element
JP2016121035A (en) * 2014-12-24 2016-07-07 株式会社オハラ Optical glass, preform and optical element
WO2022055688A2 (en) 2020-09-10 2022-03-17 Corning Incorporated Silicoborate and borosilicate glasses having high refractive index and low density
US11802073B2 (en) 2020-09-10 2023-10-31 Corning Incorporated Silicoborate and borosilicate glasses with high refractive index and low density

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8187986B2 (en) 2006-10-24 2012-05-29 Ohara Inc. Optical glass
US8563451B2 (en) 2006-10-24 2013-10-22 Ohara Inc. Optical glass
JP2010083702A (en) * 2008-09-30 2010-04-15 Hoya Corp Optical glass, glass gob for press forming and optical element
JP2010215444A (en) * 2009-03-16 2010-09-30 Nippon Electric Glass Co Ltd Optical glass
JP2016121034A (en) * 2014-12-24 2016-07-07 株式会社オハラ Optical glass, preform and optical element
JP2016121035A (en) * 2014-12-24 2016-07-07 株式会社オハラ Optical glass, preform and optical element
WO2022055688A2 (en) 2020-09-10 2022-03-17 Corning Incorporated Silicoborate and borosilicate glasses having high refractive index and low density
US11802073B2 (en) 2020-09-10 2023-10-31 Corning Incorporated Silicoborate and borosilicate glasses with high refractive index and low density

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