JP3157696B2 - Near infrared cut filter glass - Google Patents
Near infrared cut filter glassInfo
- Publication number
- JP3157696B2 JP3157696B2 JP08174795A JP8174795A JP3157696B2 JP 3157696 B2 JP3157696 B2 JP 3157696B2 JP 08174795 A JP08174795 A JP 08174795A JP 8174795 A JP8174795 A JP 8174795A JP 3157696 B2 JP3157696 B2 JP 3157696B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- infrared cut
- cut filter
- mgf
- weather resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明はカラーＶＴＲカメラの色
補正フィルタ等に使用され、４００〜６００ｎｍの可視
域を効率よく透過し、７００ｎｍ付近におけるシャープ
カット特性に優れた近赤外線カットフィルタガラスに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near-infrared cut filter glass which is used for a color correction filter of a color VTR camera, efficiently transmits a visible region of 400 to 600 nm, and has excellent sharp cut characteristics at around 700 nm.
【０００２】[0002]
【従来の技術】カラーＶＴＲカメラに使用されているＣ
ＣＤなどの撮像素子は可視域から１１００ｎｍ付近の近
赤外域にわたる分光感度を有している。したがって、そ
のままでは良好な色再現性を得ることができないので、
赤外域を吸収するフィルタを用いて通常の視感度に補正
することが必要である。2. Description of the Related Art C used in a color VTR camera
An imaging device such as a CD has a spectral sensitivity ranging from a visible region to a near infrared region near 1100 nm. Therefore, good color reproducibility cannot be obtained as it is,
It is necessary to correct the normal visibility by using a filter that absorbs the infrared region.
【０００３】従来、この種のフィルタには近赤外線を選
択的に吸収するように燐酸塩系ガラスにＣｕＯを添加し
たガラスが使用されていた。このガラスは多量のＰ2 Ｏ
5 と必須成分としてＣｕＯを含有しており、酸化性の溶
融雰囲気中で多数の酸素イオンに配位されたＣｕ2+イオ
ンを形成させることによって青緑色を呈し、近赤外線カ
ット特性を有するものである。Heretofore, for this type of filter, a glass obtained by adding CuO to a phosphate glass so as to selectively absorb near infrared rays has been used. This glass has a large amount of P 2 O
5 and contains CuO as an essential component, exhibits blue-green color by forming Cu 2+ ions coordinated to many oxygen ions in an oxidizing melting atmosphere, and has near-infrared cut characteristics. is there.
【０００４】また、最近では燐酸塩系ガラスの耐候性の
低さを改善するために基礎ガラスとして弗燐酸塩系ガラ
スを用い、これにＣｕＯを添加したガラス、たとえば特
開平1-219037号公報、特開平3-173041号公報に記載のガ
ラスなどが開発されている。[0004] Recently, in order to improve the low weather resistance of a phosphate glass, a fluorophosphate glass is used as a base glass, and CuO is added to the glass, for example, Japanese Patent Application Laid-Open No. 1-219037, The glass and the like described in JP-A-3-17341 have been developed.
【０００５】[0005]
【発明が解決しようとする課題】上記燐酸塩系ガラス
は、近赤外線カット効果を促進するためにＣｕＯの含有
量を増加させると、一般に４００〜５００ｎｍの波長域
における分光透過率が低下して緑色化の傾向を示し、か
つ６００〜７００ｎｍの波長域でのシャープカット性が
悪化するという問題点がある。特にこの様なフィルタガ
ラスは、薄板状で使用されることから、高いＣｕＯ含有
量を要求されるが、前記問題点により所望の分光透過特
性を有するものが得難い。また基礎ガラスである燐酸塩
系ガラスは、耐候性が不十分なため、ガラス研磨面にウ
ェザリングを生じるので光学フィルタとしての長期使用
には難点がある。When the content of CuO is increased to promote the near-infrared cut effect, the above-mentioned phosphate-based glass generally has a reduced spectral transmittance in a wavelength region of 400 to 500 nm and has a green color. There is a problem that the sharp cut property in the wavelength region of 600 to 700 nm is deteriorated. In particular, such a filter glass is required to have a high CuO content because it is used in the form of a thin plate, but it is difficult to obtain a filter glass having a desired spectral transmission characteristic due to the above problem. In addition, phosphate-based glass, which is a basic glass, has insufficient weather resistance and causes weathering on the polished surface of the glass, so that there is a problem in long-term use as an optical filter.
【０００６】また、上記弗燐酸塩系ガラスは、耐候性に
優れるものの失透しやすく、耐候性を向上させるために
Ｐ2 Ｏ5 含有量を低く抑えると、熱膨脹係数が大きくな
り熱衝撃に弱いという欠点がある。溶融後固化したガラ
スをフィルタとして用いるには、研削、研磨等の工程を
経るが、上記特開平1-219037号公報記載の弗燐酸塩系ガ
ラスは、５０〜１００℃の温度差でヒートショックによ
るクラックを生じるため、成形加工工程での歩留が低
い。これに対し上記特開平3-173041号公報記載のガラス
では、耐候性を損なわない範囲でＰ2 Ｏ5 含有量を高め
にしてガラスの熱膨脹係数を低めに抑え、耐ヒートショ
ック性が改善された。The above fluorophosphate glass is excellent in weather resistance but easily devitrifies. If the content of P 2 O 5 is reduced to improve the weather resistance, the coefficient of thermal expansion becomes large and the glass is susceptible to thermal shock. There is a disadvantage that. To use the glass solidified after melting as a filter, grinding, polishing and other steps are performed.However, the fluorophosphate-based glass described in Japanese Patent Application Laid-Open No. 1-219037 is heat shocked at a temperature difference of 50 to 100 ° C. Since cracks occur, the yield in the forming process is low. On the other hand, in the glass described in JP-A-3-73041, the content of P 2 O 5 was increased to the extent that the weather resistance was not impaired, the coefficient of thermal expansion of the glass was suppressed, and the heat shock resistance was improved. .
【０００７】しかしながら、このようなガラスフィルタ
の主たる用途であるカラーＶＴＲカメラでは、半導体技
術の急速な発展に伴いＣＣＤなどの固体撮像素子の小型
高密度化が進み、同時に高画質志向が強まってきてい
る。固体撮像素子の小型高密度化は、高解像度化の要請
に応えるべく画素数を増加させるとともに光学系の小型
化に対応して素子サイズを１／２インチ系から１／３イ
ンチ系、さらに１／４インチ系へと縮小させることによ
って進められてきた。この結果、１画素あたりの面積は
極めて微小なものとなり、固体撮像素子の前面に置かれ
るガラスフィルタにおいても従来問題にならなかった微
小欠陥が問題視されるようになってきた。However, in a color VTR camera, which is a main use of such a glass filter, a solid-state image pickup device such as a CCD is becoming smaller and higher in density with the rapid development of semiconductor technology, and at the same time, the desire for high image quality is increasing. I have. In order to meet the demand for higher resolution, the size of the solid-state image sensor has been increased by increasing the number of pixels to meet the demand for higher resolution, and by reducing the size of the optical system from 1/2 inch type to 1/3 inch type. It has been pursued by reducing it to a / 4 inch system. As a result, the area per pixel becomes extremely small, and small defects that have not been a problem in the past have been regarded as problems even in a glass filter placed in front of a solid-state imaging device.
【０００８】このような背景から、上記弗燐酸塩系ガラ
スはいずれも燐酸塩系ガラスに比較してガラスの硬度が
低いため、光学研磨を行うと、研磨面に微小な傷が残っ
たり端部に微小な欠けを生じたりする割合が高いという
問題点が指摘されるようになってきた。また研磨加工中
に生じた微小な欠損片がガラス基板に付着していると、
後の工程や運搬時に研磨面を傷付ける原因ともなり、欠
損片が付着した基板自体も不良品となり、著しい歩留の
低下をまねいた。特に装置内に内蔵される固体撮像素子
用のフィルタは、上記のように固体撮像素子の小型化と
ともにそのサイズが小さくなり、厚さも２〜１ｍｍ程度
まで研磨しなければならないため、研磨技術あるいはガ
ラス基板の取扱方法のみでの対策には限界があった。[0008] From the above background, since the hardness of each of the above-mentioned fluorophosphate-based glasses is lower than that of the phosphate-based glass, when optical polishing is performed, minute scratches remain on the polished surface or edge portions are not formed. However, it has been pointed out that there is a high rate of occurrence of minute chippings. In addition, if the microscopic chips generated during polishing are attached to the glass substrate,
This may cause damage to the polished surface during subsequent processes and transportation, and the substrate itself to which defective pieces have adhered becomes a defective product, resulting in a significant decrease in yield. In particular, the filter for the solid-state imaging device built in the apparatus, as described above, as the size of the solid-state imaging device is reduced, its size is reduced, and the thickness must be polished to about 2 to 1 mm. There is a limit to measures that can be taken only by handling the substrate.
【０００９】本発明は、このような事情を考慮してなさ
れたもので、所望の分光透過特性を保持しながら化学的
耐久性に優れ、かつガラスの硬度が高く研磨加工時に上
記微小欠陥が発生しにくい近赤外線カットフィルタガラ
スを提供することを目的とする。The present invention has been made in view of such circumstances, and has excellent chemical durability while maintaining desired spectral transmission characteristics, and has high hardness of glass, and the above-mentioned minute defects are generated during polishing. An object of the present invention is to provide a near-infrared cut filter glass that is difficult to perform.
【００１０】[0010]
【課題を解決するための手段】本発明は、ガラスの硬度
を所定値以上とすることにより上記目的を達成したもの
である。すなわち、本発明は、ＣｕＯを０．５〜６質量
％含有した弗燐酸塩系ガラスであって、前記基礎ガラス
中のＭｇＦ2の含有量を１０〜２５％とし、Ｐｂ，Ｚ
ｎ，Ｌａ，Ｙ，Ｙｂの弗化物または酸化物の含有を不純
物としてのみ許容し、かつビッカース硬度が４３０ｋｇ
／ｍｍ2以上であることを特徴とする近赤外線カットフ
ィルタガラスである。According to the present invention, the above object has been achieved by setting the hardness of glass to a predetermined value or more. That is, the present invention provides a fluoride phosphate-based glass containing CuO 0.5 to 6 wt%, the content of MgF 2 of the base glass and 10 to 25%, Pb, Z
The content of fluorides or oxides of n, La, Y, and Yb is allowed only as impurities, and the Vickers hardness is 430 kg.
/ Mm 2 or more.
【００１１】また、本発明のガラスは質量百分率で、Ｐ
2Ｏ5 １０〜４５％，ＭｇＦ2 １０〜２５％，ＣａＦ2
０〜２０％，ＳｒＦ2 ０〜３０％，ＢａＦ2 ０〜３
０％，ただしＭｇＦ2＋ＣａＦ2 １０〜４５％，ＳｒＦ
2＋ＢａＦ2 １０〜４５％，ＬｉＦ＋ＮａＦ＋ＫＦ
０．５〜１２％，ＡｌＦ3 ０．２〜１％未満、（ただ
し、弗化物総合計量の６０％までを酸化物に置換可能）
からなる基礎ガラス１００質量部に対してＣｕＯを０．
５〜６質量部含有させたことを特徴とする。Further, the glass of the present invention has a mass percentage of P
2 O 5 10~45%, MgF 2 10~25%, CaF 2
0-20%, SrF 2 0-30%, BaF 2 0-3
0%, however, MgF 2 + CaF 2 10 to 45%, SrF
2 + BaF 2 10~45%, LiF + NaF + KF
0.5 to 12%, AlF 3 0.2 to less than 1% (however, up to 60% of the total fluoride measurement can be replaced with oxide)
CuO is added to 100 parts by mass of the base glass made of
It is characterized by containing 5 to 6 parts by mass.
【００１２】[0012]
【作用】本発明者が種々のガラスについて、生産品種と
同様に徐冷処理を行い完全に歪みを除去したガラス板に
研磨加工を行って、欠け、傷の発生状況を確認したとこ
ろ、弗燐酸塩系ガラスであってもビッカース硬度が４３
０ｋｇ／ｍｍ2 以上であるものは、それ以下のものに比
べて欠け、傷ともその発生率に有意差が認められ、特に
４５０ｋｇ／ｍｍ2 以上のものでは欠け、傷の発生率は
極めて低いことが確認された。The present inventor performed gradual cooling treatment on various glasses in the same manner as in the production varieties and polished the glass plates from which distortion was completely removed, and confirmed the occurrence of chips and scratches. Vickers hardness of 43 even with salt-based glass
0 kg / mm 2 or more in which one is missing compared to that following are wound with a significant difference was observed in the incidence, in particular 450 kg / mm chipping than 2 more than that, the incidence of scratch very low Was confirmed.
【００１３】次に本発明のガラス組成を上記範囲に限定
した理由を説明する。Next, the reason why the glass composition of the present invention is limited to the above range will be described.
【００１４】Ｐ2 Ｏ5 はガラスの網目構造を形成する主
成分であるが、１０％未満ではガラス化が困難であり、
４５％を越えると耐候性が悪くなる。P 2 O 5 is a main component forming a network structure of glass, but if it is less than 10%, vitrification is difficult.
If it exceeds 45%, the weather resistance will deteriorate.
【００１５】ＭｇＦ2 はガラスの硬度を上げる効果があ
る成分であるが、１０％未満ではその効果が十分得られ
ず、２５％を越えると失透傾向が強くなって好ましくな
い。好ましくは２０〜２４％であり、この範囲で前記効
果はより顕著となる。MgF 2 is a component that has the effect of increasing the hardness of the glass. However, if it is less than 10%, the effect cannot be sufficiently obtained, and if it exceeds 25%, the tendency to devitrify becomes unfavorable. Preferably it is 20 to 24%, and in this range, the effect becomes more remarkable.
【００１６】ＣａＦ2 はガラスの硬度を低下することな
くガラスを安定化させる効果があるが、２０％を越える
と溶融温度が高くなり、また失透しやすくなる。ただ
し、ＭｇＦ2 とＣａＦ2 の合量が１０％未満ではガラス
の硬度を高める効果が不十分であり、さらに２０％以上
とすることが効果的である。また、この合量が４５％を
越えると溶融温度が高くなり、またガラスが失透しやす
くなるので好ましくない。Although CaF 2 has the effect of stabilizing the glass without lowering the hardness of the glass, if it exceeds 20%, the melting temperature becomes high and the glass tends to be devitrified. However, if the total amount of MgF 2 and CaF 2 is less than 10%, the effect of increasing the hardness of the glass is insufficient, and it is more effective to make it 20% or more. On the other hand, if the total amount exceeds 45%, the melting temperature becomes high, and the glass tends to be devitrified, which is not preferable.
【００１７】ＳｒＦ2 、ＢａＦ2 はガラスを安定化させ
耐候性を向上させる効果があるが、各々３０％を越える
と失透傾向が強くなり好ましくない。ただし、Ｓｒ
Ｆ2 、ＢａＦ2 の合量が１０％未満では前記効果が十分
に得られず、４５％を越えると失透傾向が著しくなり所
望のガラスが得られない。SrF 2 and BaF 2 have the effect of stabilizing the glass and improving the weather resistance. However, if each exceeds 30%, the tendency of devitrification becomes strong, which is not preferred. However, Sr
If the combined amount of F 2 and BaF 2 is less than 10%, the above effect cannot be sufficiently obtained, and if it exceeds 45%, the devitrification tendency becomes remarkable, and a desired glass cannot be obtained.
【００１８】ＬｉＦ、ＮａＦ、ＫＦは溶融温度を下げる
ために有効な成分であるが、０．５％未満ではその効果
が期待できず、１２％を越えると耐候性の低下をまね
く。LiF, NaF, and KF are effective components for lowering the melting temperature. However, if the content is less than 0.5%, the effect cannot be expected, and if it exceeds 12%, the weather resistance is reduced.
【００１９】ＡｌＦ3 は耐候性向上に有効な成分である
が、溶融状態において他の成分との粘度差が大きいた
め、１％を越えて含有させるとガラスの均質化が困難と
なり、ガラス中に異質層が発生しやすくなる。またＡｌ
Ｆ3 を１％未満にすることにより溶融温度を低く抑える
ことができ、各成分の揮発が防止されてガラス組成が安
定する効果がある。特に０．２〜０．７％の範囲で前記
効果が顕著となる。AlF 3 is a component effective for improving the weather resistance. However, since the difference in viscosity from other components in the molten state is large, if the content exceeds 1%, it becomes difficult to homogenize the glass. Heterogeneous layers are likely to occur. Al
By setting F 3 to less than 1%, the melting temperature can be kept low, and there is an effect that each component is prevented from volatilizing and the glass composition is stabilized. In particular, the effect is remarkable in the range of 0.2 to 0.7%.
【００２０】また、以上の成分のうち弗化物の総合計量
の６０％までを酸化物に置換することが可能であるが、
置換量が６０％を越えると目的とする分光透過率、耐候
性、硬度が得られなくなる。It is possible to replace up to 60% of the total amount of fluoride among the above components with oxides.
If the substitution amount exceeds 60%, the desired spectral transmittance, weather resistance and hardness cannot be obtained.
【００２１】ＣｕＯは近赤外線カットのための必須成分
であるが、０．５％未満では十分な近赤外線カット特性
が得られず、６％を越えると可視域での透過率が低下
し、またガラスが不安定となる。CuO is an essential component for cutting off near-infrared rays, but if it is less than 0.5%, sufficient near-infrared ray cutoff characteristics cannot be obtained. If it exceeds 6%, the transmittance in the visible region decreases, and The glass becomes unstable.
【００２２】本発明のガラスにおいて、Ｐｂ，Ｚｎ，Ｌ
ａ，Ｙ，Ｙｂの弗化物または酸化物の添加は、ガラスの
硬度を著しく低下させる傾向があるため、不純物として
含有することがあっても１％未満とすることが好まし
い。In the glass of the present invention, Pb, Zn, L
Since the addition of fluorides or oxides of a, Y, and Yb tends to significantly lower the hardness of the glass, even if it is contained as an impurity, it is preferably less than 1%.
【００２３】[0023]
【実施例】以下、本発明の実施例について説明する。本
発明の実施例を表１に示す。表１中のガラス組成は質量
百分率で示し、耐候性は研磨したガラスを温度６０℃、
相対湿度９５％の条件下に保持し、ガラスの表面に変質
が見られるまでの時間で示した。Embodiments of the present invention will be described below. Table 1 shows examples of the present invention. The glass composition in Table 1 is shown as a percentage by mass, and the weather resistance of the polished glass at a temperature of 60 ° C.
The condition was maintained under the condition of a relative humidity of 95%, and the time until the deterioration of the glass surface was observed was shown.
【００２４】表１に示したガラスは、いずれも所定の組
成となるように原料を調合し、白金るつぼに収容し蓋を
して６５０〜８５０℃の温度で溶融し、攪拌・清澄後、
金型内に鋳込み、徐冷した後、切断・機械研磨して肉厚
１．６ｍｍの平板状に加工した。なお、表１中、Ｎｏ．
２１〜２６のガラスは比較例を示し、Ｎｏ．２１〜２３
は燐酸塩系ガラスの例、Ｎｏ．２４〜２６は従来の弗燐
酸塩系ガラスの例である。これら比較例についても同様
にして肉厚１．６ｍｍの平板状の試料を作成した。Each of the glasses shown in Table 1 is prepared by mixing raw materials so as to have a predetermined composition, housed in a platinum crucible, covered with a lid, melted at a temperature of 650 to 850 ° C., and after stirring and fining,
After being cast in a mold and gradually cooled, it was cut and mechanically polished to form a 1.6 mm thick flat plate. In Table 1, No.
Glasses Nos. 21 to 26 show comparative examples. 21-23
Is an example of a phosphate glass; 24 to 26 are examples of conventional fluorophosphate-based glasses. For these comparative examples, flat 1.6 mm-thick samples were prepared in the same manner.
【００２５】[0025]
【表１】 [Table 1]
【表１】 [Table 1]
【表１】 [Table 1]
【表１】 [Table 1]
【００２６】以上のようにして作成した平板状のガラス
について分光透過率を測定した。このうち表１に示す実
施例Ｎｏ．２，９，１１，１５，２０および比較例Ｎ
ｏ．２１，２２，２３について分光透過率曲線を図１に
示す。図１から明らかなように本発明に係る実施例のガ
ラスは、比較例のガラスに比べて４００〜５００ｎｍに
おける透過率が高く、６００〜７００ｎｍにかけてのシ
ャープカット性に優れている。The spectral transmittance of the flat glass produced as described above was measured. Among them, Example No. 1 shown in Table 1 2,9,11,15,20 and Comparative Example N
o. The spectral transmittance curves for 21, 22, and 23 are shown in FIG. As is clear from FIG. 1, the glass of the example according to the present invention has a higher transmittance at 400 to 500 nm than the glass of the comparative example, and is excellent in sharp cut properties from 600 to 700 nm.
【００２７】また、耐候性試験の結果、比較例の燐酸塩
系ガラスでは２５０時間を越えると表面に変質が見られ
たのに対し、実施例のガラスは１０００時間経過後も表
面に変質は認められなかった。As a result of the weather resistance test, the surface of the phosphate glass of Comparative Example was altered after 250 hours, whereas the surface of the glass of Example was altered after 1000 hours. I couldn't.
【００２８】上記平板状の試料作成にあたっては、各ガ
ラスについて、金型内に鋳込み徐冷したガラスブロック
から厚さ２．２ｍｍ程度にスライスし、１１×１１ｍｍ
の大きさにカットしたものを３００枚ずつ研磨装置の定
盤に固定し、研磨材として酸化セリウムを使用し、荷重
１００ｇ／ｃｍ2 、回転数約５０ｒｐｍで、肉厚１．６
ｍｍになるまで機械研磨した。In preparing the flat sample, each glass was sliced from a glass block cast in a mold and cooled slowly to a thickness of about 2.2 mm, and then 11 × 11 mm.
Each of the cut pieces having a size of 300 pieces is fixed on a surface plate of a polishing apparatus, and cerium oxide is used as a polishing material. The load is 100 g / cm 2 , the number of rotations is about 50 rpm, and the wall thickness is 1.6.
mm.
【００２９】洗浄・乾燥後、得られた平板状の試料につ
いて５μｍ程度の微小なものも含む傷、欠けの発生率を
調査した。この結果も表１に示した。従来の弗燐酸塩系
ガラスを示すＮｏ．２４〜２６のガラスは、耐候性では
本実施例とほぼ同等の性能を持つものの、ガラスの硬度
が低く、加工工程での傷、欠けの発生率が高い。これに
対し本実施例のガラスでは、表中に「硬度」として示し
たビッカース硬度（ｋｇ／ｍｍ2 ）の高いものほど加工
工程での傷、欠けの発生率が低くなっており、Ｎｏ．２
４〜２６の比較例より２０％以上低下している。After washing and drying, the occurrence of scratches and chips, including minute ones of about 5 μm, was examined on the obtained flat sample. The results are also shown in Table 1. No. showing the conventional fluorophosphate-based glass. Although the glass of Nos. 24 to 26 has almost the same performance in the weather resistance as in this embodiment, the hardness of the glass is low, and the occurrence rate of scratches and chips in the processing step is high. On the other hand, in the glass of this example, the higher the Vickers hardness (kg / mm 2 ) shown as “hardness” in the table, the lower the occurrence rate of scratches and chips in the working process. 2
20% or more lower than Comparative Examples 4 to 26.
【００３０】以上から本発明に係る実施例のガラスは、
弗燐酸塩系ガラスのもつ優れた耐候性と近赤外線シャー
プカット性を維持したまま機械的加工に対する加工品質
を向上できる。この結果、従来のガラスで生じていた微
小傷や欠損片による二次的不良も減少することができ、
高解像度化の要請に対応した高品質のガラスフィルタを
歩留まり良く提供することが可能になる。From the above, the glass of the embodiment according to the present invention is:
The processing quality for mechanical processing can be improved while maintaining the excellent weather resistance and near-infrared sharp cut property of the fluorophosphate glass. As a result, secondary defects due to minute scratches and broken pieces that have occurred in conventional glass can also be reduced,
It is possible to provide a high-quality glass filter that meets the demand for higher resolution with a high yield.
【００３１】[0031]
【発明の効果】以上のように本発明のガラスフィルタ
は、耐候性に優れた弗燐酸塩系ガラスからなり、可視域
における透過率が高く、近赤外域でのシャープカット性
に優れた初期透過率特性を長期間に渡って維持できる。
またガラスの硬度を高めたことによって機械的加工に対
しても微小欠陥が発生しにくくなり、特に小型光学フィ
ルタとして理想的なものである。As described above, the glass filter of the present invention is made of a fluorophosphate-based glass having excellent weather resistance, has a high transmittance in the visible region, and has an initial transmission having excellent sharp cut properties in the near infrared region. The rate characteristics can be maintained for a long period of time.
In addition, by increasing the hardness of the glass, micro defects are less likely to occur even in mechanical processing, and it is particularly ideal as a small optical filter.
【図１】本発明の実施例のガラスと比較例のガラスの分
光透過率を示す曲線図である。FIG. 1 is a curve diagram showing the spectral transmittance of a glass of an example of the present invention and a glass of a comparative example.
１ 本発明の実施例Ｎｏ．２，９，１５のガラスの分光
透過率曲線 ２ 本発明の実施例Ｎｏ．１１，２０のガラスの分光透
過率曲線 ３ 比較例Ｎｏ．２１，２２，２３のガラスの分光透過
率曲線Example 1 of the present invention Spectral transmittance curves of the glasses Nos. 2, 9 and 15 2 Spectral transmittance curves of glasses of Nos. 11 and 20 3 Comparative Example No. Spectral transmittance curves of glasses 21, 22, and 23
Claims (2)
００質量部に対してＣｕＯを０．５〜６質量部含有した
ガラスであって、前記基礎ガラス中のＭｇＦ2の含有量
を１０〜２５％とし、Ｐｂ，Ｚｎ，Ｌａ，Ｙ，Ｙｂの弗
化物または酸化物の含有を不純物としてのみ許容し、か
つビッカース硬度が４３０ｋｇ／ｍｍ2以上であること
を特徴とする近赤外線カットフィルタガラス。1. Basic glass 1 made of fluorophosphate glass
A glass containing 0.5 to 6 parts by mass of CuO with respect to 00 parts by mass, wherein the content of MgF 2 in the basic glass is 10 to 25%, and that of Pb, Zn, La, Y, and Yb is A near-infrared cut filter glass characterized in that a compound or oxide is contained only as an impurity and the Vickers hardness is 430 kg / mm 2 or more.
Ｏ5 １０〜４５％，ＭｇＦ2 １０〜２５％，ＣａＦ2
０〜２０％，ＳｒＦ2 ０〜３０％，ＢａＦ2０〜３０
％，ただしＭｇＦ2＋ＣａＦ2 １０〜４５％，ＳｒＦ2
＋ＢａＦ2 １０〜４５％，ＬｉＦ＋ＮａＦ＋ＫＦ
０．５〜１２％，ＡｌＦ3 ０．２〜１％未満、（ただ
し、弗化物総合計量の６０％までを酸化物に置換可能）
からなる組成を有することを特徴とする請求項１記載の
近赤外線カットフィルタガラス。2. The method according to claim 1, wherein the base glass comprises P 2
O 5 10~45%, MgF 2 10~25 %, CaF 2
0-20%, SrF 2 0-30%, BaF 2 0-30
%, But MgF 2 + CaF 2 10 to 45%, SrF 2
+ BaF 2 10 to 45%, LiF + NaF + KF
0.5 to 12%, AlF 3 0.2 to less than 1% (however, up to 60% of the total fluoride measurement can be replaced with oxide)
The near-infrared cut filter glass according to claim 1, having a composition consisting of:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08174795A JP3157696B2 (en) | 1995-03-14 | 1995-03-14 | Near infrared cut filter glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08174795A JP3157696B2 (en) | 1995-03-14 | 1995-03-14 | Near infrared cut filter glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08253341A JPH08253341A (en) | 1996-10-01 |
| JP3157696B2 true JP3157696B2 (en) | 2001-04-16 |
Family
ID=13755038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08174795A Expired - Lifetime JP3157696B2 (en) | 1995-03-14 | 1995-03-14 | Near infrared cut filter glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3157696B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005353718A (en) * | 2004-06-09 | 2005-12-22 | Hoya Corp | Window glass of semiconductor package, glass window for semiconductor package, and semiconductor package |
| KR101978337B1 (en) * | 2017-01-20 | 2019-05-14 | 주식회사 범한 | Noise filter assembly mounted with surge protector |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4925243B2 (en) * | 2005-06-09 | 2012-04-25 | Ａｇｃテクノグラス株式会社 | Near-infrared cut filter glass |
| JP5439903B2 (en) * | 2008-03-31 | 2014-03-12 | 旭硝子株式会社 | Plate-shaped optical glass and end-face processing method for plate-shaped optical glass |
| JP5126111B2 (en) * | 2009-02-24 | 2013-01-23 | 旭硝子株式会社 | Near-infrared cut filter glass and manufacturing method thereof |
| JP5801773B2 (en) | 2011-08-11 | 2015-10-28 | Hoya株式会社 | Fluorophosphate glass, method for producing the same, and near infrared light absorption filter |
| JP6642575B2 (en) | 2015-07-31 | 2020-02-05 | Ａｇｃ株式会社 | Optical filter and near infrared cut filter |
| CN106517773A (en) * | 2016-10-20 | 2017-03-22 | 南通向阳光学元件有限公司 | High-transmissivity cyanine polycrystalline glass |
| JP2019038732A (en) * | 2017-08-29 | 2019-03-14 | 日本電気硝子株式会社 | Near-infrared radiation absorption glass |
-
1995
- 1995-03-14 JP JP08174795A patent/JP3157696B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005353718A (en) * | 2004-06-09 | 2005-12-22 | Hoya Corp | Window glass of semiconductor package, glass window for semiconductor package, and semiconductor package |
| KR101978337B1 (en) * | 2017-01-20 | 2019-05-14 | 주식회사 범한 | Noise filter assembly mounted with surge protector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08253341A (en) | 1996-10-01 |
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