JPH0442344B2 - - Google Patents
Info
- Publication number
- JPH0442344B2 JPH0442344B2 JP6861088A JP6861088A JPH0442344B2 JP H0442344 B2 JPH0442344 B2 JP H0442344B2 JP 6861088 A JP6861088 A JP 6861088A JP 6861088 A JP6861088 A JP 6861088A JP H0442344 B2 JPH0442344 B2 JP H0442344B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- present
- infrared
- chemical durability
- cuo
- 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
Links
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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Description
〔産業上の利用分野〕
本発明はカラーVTRカメラの色補正フイルタ
ガラス等に使用され、400〜600nmの可視域を効
率よく透過し、700nmにおける吸収特性を良好に
した近赤外カツトフイルタガラスに関する。
〔従来の技術〕
従来、カラーVTRカメラに使用されている撮
像素子は可視域から1000nm付近の近赤外域にわ
たる分光感度を有している。従つて、このままで
は良好な色再現性を得ることができないので赤外
域を吸収するフイルタを用いて、通常の視感度に
補正することが必要である。このフイルタは近赤
外波長を選択的に吸収するように、リン酸ガラス
にCuOを添加したフイルタガラスが使用されてい
る。このフイルタガラスは多量のP2O5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つて青緑色をを呈し、
近赤外カツト特性を有するものである。
〔発明が解決しようとする課題〕
しかるに、上記のフイルタガラスは、近赤外カ
ツト効果を促進するため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
透過性が低下して緑色化の傾向を示し、かつ600
〜700nmの波長域におけるシヤープカツト特性が
悪化する。また基礎ガラスであるリン酸ガラス
は、耐候性が不十分なためガラス研磨面にウエザ
リングを生じるので、長期間にわたつて使用する
には難点がある。
本発明は上記事情を考慮してなされたもので、
400〜600nmの波長域を効率よく透過し、700nm
における吸収特性が良好で、かつ化学的耐久性に
すれた近赤外カツトフイルタガラスを提供するこ
とを目的とする。
〔課題を解決するための手段と作用〕
本発明は上記目的を達成するためにP2O5と共
にガラス網目を形成するAl2O3，B2O3の含有率を
高めに設定するとともに、アルカリ土類金属酸化
物を含有しない組成としたものである。すなわ
ち、本発明は重量百分率で、P2O570〜85％，
Al2O38〜17％，B2O31〜10％，Li2O0〜３％，
Na2O0〜５％，K2O0〜５％，Li2O＋Na2O＋
K2O0.1〜５％，SiO20〜３％，CuO0.3〜５％か
らなる組成を有する近赤外カツトフイルタガラス
である。
従来、この種のガラスでは溶融性の改善、失透
防止などの目的でアルカリ土類金属酸化物を添加
するのが一般的であつたが、本発明者はアルカリ
土類金属酸化物を含有させず、アルカリ金属酸化
物を用いた方が少量の添加で同等の効果が得られ
ると同時に化学的耐久性も改善できることを見出
し本発明に到つたものである。
次に上記組成範囲を限定した理由について説明
する。
P2O5はガラス網目を構成する主成分であるが
70％未満では溶融性が悪化し、85％を超えると失
透が発生しやすくなる。
Al2O3はガラスの化学的耐久性を向上させるた
めの不可欠の成分であるが、８％未満ではその効
果がなく、17％を越えると溶融性が悪くなる。
B2O3は化学的耐久性を向上させ、ガラスの安
定化に有効な成分であるが、１％未満ではその効
果がなく、10％を越えると失透傾向が大きくな
る。
Li2O，Na2O，K2Oはガラスの溶融性を改善
し、失透を防止するために添加するが、これらの
合量が0.1％未満ではその効果がなく、各成分が
上記範囲を越えると化学的耐久性が劣化する。
SiO2は化学的耐久性を向上させる効果がある
が、３％を越えると溶融性が極端に悪化する。
CuOは、着色剤として添加され近赤外シヤープ
カツトのために必須成分であるが、0.3％未満で
はその効果が得られず、５％を越えると近赤外シ
ヤープカツト性が阻害される。
〔実施例〕
本発明の実施例を次表に示す。表中、ガラス組
成は重量百分率で示し、化学的耐久性として、耐
水性を日本光学硝子工業会規格の光学ガラスの化
学的耐久性の測定法（粉未法）により測定した減
量率で示す。
下表のガラスはいずれも所定の酸化物組成が得
られるように原料を調合し、るつぼで1000〜1400
℃の温度で溶融し、撹拌、清澄後金型に鋳込み、
徐冷した後切断、研磨して得たものである。Cu
イオンは溶融中に還元されると、所望の分光透過
特性を満足することができないので、溶融、清澄
は酸化性雰囲気で行つた。
[Industrial Field of Application] The present invention relates to a near-infrared cut filter glass that is used as a color correction filter glass for color VTR cameras, and that efficiently transmits the visible wavelength range of 400 to 600 nm and has good absorption characteristics at 700 nm. . [Prior Art] Image sensors conventionally used in color VTR cameras have spectral sensitivities ranging from the visible region to the near-infrared region around 1000 nm. Therefore, since good color reproducibility cannot be obtained as is, it is necessary to correct the visibility to normal visibility using a filter that absorbs the infrared region. This filter uses filter glass made by adding CuO to phosphate glass so that it selectively absorbs near-infrared wavelengths. This filter glass contains a large amount of P 2 O 5 and CuO as an essential component, and in an oxidizing molten atmosphere, it becomes blue by forming Cu 2+ ions coordinated with many oxygen ions. exhibits a green color,
It has near-infrared cut characteristics. [Problems to be Solved by the Invention] However, in the above filter glass, when the content of CuO is increased to promote the near-infrared cutting effect, the spectral transmittance in the wavelength range of 400 to 500 nm generally decreases. showing a tendency towards greening, and 600
Sharp cut characteristics deteriorate in the wavelength range of ~700 nm. Furthermore, the basic glass, phosphate glass, has insufficient weather resistance and causes weathering on the polished surface of the glass, making it difficult to use over a long period of time. The present invention was made in consideration of the above circumstances, and
Efficiently transmits wavelength range from 400 to 600nm, 700nm
An object of the present invention is to provide a near-infrared cut filter glass that has good absorption characteristics and excellent chemical durability. [Means and effects for solving the problems] In order to achieve the above object, the present invention sets a high content rate of Al 2 O 3 and B 2 O 3 that form a glass network together with P 2 O 5 , and The composition does not contain alkaline earth metal oxides. That is, the present invention uses P 2 O 5 70-85% in weight percentage,
Al 2 O 3 8-17%, B 2 O 3 1-10%, Li 2 O 0-3%,
Na 2 O 0-5%, K 2 O 0-5%, Li 2 O + Na 2 O +
This is near-infrared cut filter glass having a composition of 0.1-5% K 2 O, 0-3% SiO 2 , and 0.3-5% CuO. In the past, alkaline earth metal oxides were generally added to this type of glass for the purpose of improving meltability and preventing devitrification, but the present inventor has developed a glass that contains alkaline earth metal oxides. First, we have discovered that the use of an alkali metal oxide can provide the same effect with a small amount of addition and at the same time improve chemical durability, leading to the present invention. Next, the reason for limiting the above composition range will be explained. P 2 O 5 is the main component that makes up the glass network.
If it is less than 70%, meltability deteriorates, and if it exceeds 85%, devitrification tends to occur. Al 2 O 3 is an essential component for improving the chemical durability of glass, but if it is less than 8%, it has no effect, and if it exceeds 17%, the meltability deteriorates. B 2 O 3 is an effective component for improving chemical durability and stabilizing glass, but if it is less than 1%, it has no effect, and if it exceeds 10%, the tendency to devitrify increases. Li 2 O, Na 2 O, and K 2 O are added to improve the meltability of glass and prevent devitrification, but if their total amount is less than 0.1%, they have no effect, and each component must be within the above range. If it exceeds this, chemical durability will deteriorate. SiO 2 has the effect of improving chemical durability, but if it exceeds 3%, the meltability deteriorates extremely. CuO is added as a coloring agent and is an essential component for near-infrared sharp cutting, but if it is less than 0.3%, the effect cannot be obtained, and if it exceeds 5%, near-infrared sharp cutting properties are inhibited. [Example] Examples of the present invention are shown in the following table. In the table, the glass composition is shown in weight percentage, and the water resistance is shown as the weight loss rate measured by the optical glass chemical durability measurement method (powder method) specified by the Japan Optical Glass Industry Association. For all the glasses in the table below, raw materials are mixed to obtain the specified oxide composition, and the glass is heated to 1000 to 1400 in a crucible.
Melt at a temperature of ℃, stir, clarify and then cast into a mold.
It was obtained by slowly cooling, cutting, and polishing. Cu
If ions were reduced during melting, desired spectral transmission characteristics could not be achieved, so melting and refining were performed in an oxidizing atmosphere.
【表】
上表から明らかなように、本発明に係る実施例
のガラスは、いずれも良好な耐水性を示し、ガラ
スのウエザリングによる透過率の劣化が少ないす
ぐれたガラスである。
〔発明の効果〕
以上のように本発明のガラスは、リン酸ガラス
にCuOを添加した近赤外カツトフイルタガラスに
おいて、P2O5と共にガラスの網目構造を形成す
るAl2O3，B2O3を多量に導入するとともにアルカ
リ土類金属酸化物を含有しない組成としたもの
で、従来欠点とされていた化学的耐久性を向上さ
せるとともに、400〜600nmの可視域を効率よく
透過し、700nmにおける吸収特性を良好にする優
れた利点を有するものである。[Table] As is clear from the above table, all of the glasses of Examples according to the present invention exhibit good water resistance and are excellent glasses with little deterioration in transmittance due to glass weathering. [Effects of the Invention] As described above, the glass of the present invention is a near-infrared cut filter glass in which CuO is added to phosphate glass, in which Al 2 O 3 , B 2 which forms a glass network structure together with P 2 O 5 It has a composition that incorporates a large amount of O 3 and does not contain alkaline earth metal oxides, improving chemical durability, which was previously considered a drawback, and efficiently transmitting visible light in the 400 to 600 nm range. It has the excellent advantage of having good absorption characteristics at 700 nm.
Claims (1)
％，B2O31〜10％，Li2O0〜３％，Na2O0〜５％，
K2O0〜５％、Li2O＋Na2O＋K2O0.1〜５％，
SiO20〜３％，CuO0.3〜５％からなる組成を有す
る近赤外カツトフイルタガラス。1 In weight percentage, P 2 O 5 70-85%, Al 2 O 3 8-17
%, B 2 O 3 1-10%, Li 2 O 0-3%, Na 2 O 0-5%,
K2O0 ~5%, Li2O + Na2O + K2O0.1 ~5%,
A near-infrared cut filter glass having a composition of 0 to 3% SiO 2 and 0.3 to 5% CuO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6861088A JPH01242439A (en) | 1988-03-23 | 1988-03-23 | Cut-off filter glass for near infrared rays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6861088A JPH01242439A (en) | 1988-03-23 | 1988-03-23 | Cut-off filter glass for near infrared rays |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01242439A JPH01242439A (en) | 1989-09-27 |
| JPH0442344B2 true JPH0442344B2 (en) | 1992-07-13 |
Family
ID=13378708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6861088A Granted JPH01242439A (en) | 1988-03-23 | 1988-03-23 | Cut-off filter glass for near infrared rays |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01242439A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2510146B2 (en) * | 1993-02-08 | 1996-06-26 | 東芝硝子株式会社 | Near infrared cut filter glass |
| JP5206158B2 (en) * | 2008-06-30 | 2013-06-12 | 旭硝子株式会社 | Glass for near infrared absorption filter and infrared cut filter using the same |
| JP5476692B2 (en) * | 2008-09-04 | 2014-04-23 | 旭硝子株式会社 | Phosphate glass body and near-infrared cut filter using the glass body |
| JP5958929B2 (en) * | 2012-02-15 | 2016-08-02 | セイコーインスツル株式会社 | Photodetection device |
| JP6211862B2 (en) * | 2013-09-18 | 2017-10-11 | エスアイアイ・セミコンダクタ株式会社 | Optical semiconductor device and manufacturing method thereof |
| CN110806612A (en) * | 2018-08-06 | 2020-02-18 | 张家港康得新光电材料有限公司 | Optical filter and image sensor with same |
-
1988
- 1988-03-23 JP JP6861088A patent/JPH01242439A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01242439A (en) | 1989-09-27 |
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