JPH048387B2 - - Google Patents
Info
- Publication number
- JPH048387B2 JPH048387B2 JP29544185A JP29544185A JPH048387B2 JP H048387 B2 JPH048387 B2 JP H048387B2 JP 29544185 A JP29544185 A JP 29544185A JP 29544185 A JP29544185 A JP 29544185A JP H048387 B2 JPH048387 B2 JP H048387B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- cuo
- infrared
- chemical durability
- raw materials
- 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
- 239000011521 glass Substances 0.000 claims description 27
- 239000002994 raw material Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 235000019402 calcium peroxide Nutrition 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000002834 transmittance Methods 0.000 description 6
- 239000005365 phosphate glass Substances 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 5
- 239000010949 copper Substances 0.000 description 4
- 238000004031 devitrification Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 239000006121 base glass Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000005304 optical glass Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910011255 B2O3 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- VXPLXMJHHKHSOA-UHFFFAOYSA-N propham Chemical compound CC(C)OC(=O)NC1=CC=CC=C1 VXPLXMJHHKHSOA-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C03C3/17—Silica-free oxide glass compositions containing phosphorus containing aluminium or beryllium
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
〔発明の技術分野〕
本発明は、カラーVTRカメラの色補正フイル
タ等に使用され、400〜600nｍの可視域を効率よ
く透過し、600〜700nｍの波長域をシヤープカツ
トする近赤外カツトフイルタガラスおよびその製
造法に関する。
〔発明の技術的背景とその問題点〕
カラーVTRカメラに使用されている撮像管の
感光素子は、第２図の曲線Ｃに示すように可視域
から1000nｍ付近の近赤外域に亘る分光感度を有
している。従つて、このままでは良好な色再現を
得ることができないので、赤外側を吸収するフイ
ルタを用いて通常の視感度（曲線Ｄ）に補正す
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
緑色を呈し、第１図の曲線Ｂに示すような近赤外
カツト特性を有するものである。
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の含有量を増大させ
ると、一般に400〜500nｍ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
におけるシヤープカツト特性が悪化する。また基
礎ガラスがリン酸ガラスであるため、耐候性が不
十分であり、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
り、化学的耐久性を向上させることが望まれてい
る。
〔発明の目的〕
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、600〜
700nｍにおけるシヤープカツト特性が良好で、
かつ化学的耐久性にすぐれた近赤外カツトフイル
タガラスおよびその製造法を提供することを目的
とする。
〔発明の概要〕
本発明は上記の目的を達成するために、アルカ
リ金属酸化物の含有量を0.2重量％以下とし、基
礎ガラスの組成を調整したものである。すなわち
重量百分率でP2O565〜85％、Al2O35〜17％、
MgO＋ZnO＋CaO2〜12％、BaO＋SrO2〜10％、
B2O3＋SiO2＋ZrO2＋TiO2＋La2O3＋Y2O30.2〜
10％、SO310ppm〜１％、CuO0.5〜８％なる組
成を有する近赤外カツトフィルタガラスである。
また、前記ガラス組成が得られるように原料を
調合し、かつ原料中に硫酸塩としてSO3を１〜10
重量％含有させて溶融する近赤外カツトフイルタ
ガラスの製造法である。
CuOは着色剤として添加され、近赤外シヤープ
カツトのための必須成分である。
P2O5はガラス網目を構成する主成分であり、
Al2O3はリン酸ガラスの化学的耐久性を向上する
ための不可欠の成分である。MgO、ZnO、CaO、
BaO、SrOはガラスの網目修飾酸化物であり、溶
解性、成形性の向上および失透防止のための成分
である。B2O3、SiO2、ZrO2、TiO2、La2O3、
Y2O3は近赤外シヤープカツトに影響を与えるこ
となく化学的耐久性を向上させる成分である。
SO3はアルカリ金属、アルカリ土類金属、銅に
係る調合原料を選択し硫酸塩とすることで導入さ
れ、化学的耐久性を向上させる成分である。また
硫酸塩MSO4（Ｍ：アルカリ金属、アルカリ土類
金属、または銅）は溶融過程において化学反応を
起し、MSO4→MO＋SO3、SO3→SO2＋Ｏとな
り、この発生した酸素Ｏが溶融中のガラスを強酸
化性に保持するので、Cu2+イオンの着色を促進
し、近赤外線のシヤープカツト性に著しい効果を
示す。
次に本発明のガラス組成を前記範囲に限定した
理由を説明する。
P2O5は65％未満では400nｍにおける透過率が
低下し、85％を超えるとリン酸ガラスの化学的耐
久性を劣化させる。Al2O3は５％未満では化学的
耐久性が低下し、17％を超えると紫外域の透過率
が低下し、かつ溶融性がわるくなる。
MgO、ZnO、CaOは１種または２種以上の合
量が２％未満では化学的耐久性が低下し、かつ成
形性がわるくなり、12％を超えるとCuOによる赤
外シヤープカツト性能を阻害する。BaO、SrOは
単独または合量が２％未満では良好な近赤外シヤ
ープカツト性能が得られず、10％を超えるとガラ
スに失透が生じる。
B2O3、SiO2、ZrO2、TiO2、La2O3、Y2O3は１
種または２種以上の合量が10％を超えるとガラス
が失透性を有し、近赤外シヤープカツト性能を悪
化させる。
SO3は10ppm未満では化学的耐久性改善の効果
がなく、１％を超えると可視域の吸収が増大する
ので好ましくない。
CuOは0.5％未満では良好な近赤外シヤープカ
ツト効果が得られず、８％を超えると可視域全体
の透過率が低下する。
Na2O、K2O、Li2Oは化学的耐久性を低下させ
るので含有しないことが望ましいが、他の原料に
含まれる不純物として混入が避けられないので
0.2％まで許容される。
次に本発明のガラスの製造法において、調合原
料中に硫酸塩として含有させるSO3を１〜10重量
％に限定した理由を説明する。
硫酸塩として導入されるSO3が１％未満では、
溶融過程で分解反応が生じ酸化雰囲気を保持する
効果がほとんど得られず、10％を超えると溶融時
に著しく発泡し、るつぼから溢れ溶融が困難とな
る。また、ガラス中に残り泡が多く存在する。
SO3を１〜10重量％含有させることにより、本発
明のガラスに対し、溶融が終了するまでSO3が残
在し、酸化雰囲気を保持し、CuOによる近赤外線
のシヤープカツト性をよくし、ガラスの耐久性を
向上させる。
〔発明の実施例〕
本発明の実施例を次表に示す。表中No.１〜No.９
は実施例で、No.10〜No.12が比較例であり、ガラス
組成は重量百分率で示す。また耐水性は日本光学
硝子工業会規格の光学ガラスの化学的耐久性の測
定法によつて示してある。
[Technical Field of the Invention] The present invention relates to a near-infrared cut filter glass that is used in color correction filters of color VTR cameras, etc., and that efficiently transmits the visible wavelength range of 400 to 600 nm and sharply cuts the wavelength range of 600 to 700 nm. Regarding its manufacturing method. [Technical background of the invention and its problems] The photosensitive element of the image pickup tube used in color VTR cameras has a spectral sensitivity ranging from the visible region to the near-infrared region around 1000 nm, as shown by curve C in Figure 2. have. Therefore, since good color reproduction cannot be obtained as is, a filter that absorbs infrared light is used to correct the visibility to normal visibility (curve D). This filter uses filter glass made by adding CuO to phosphate glass so that it selectively absorbs near-infrared wavelengths. This glass has a large amount
It contains P 2 O 5 and CuO as an essential component, and in an oxidizing molten atmosphere, it exhibits a blue-green color by forming Cu 2+ ions coordinated with many oxygen ions. It has near-infrared cut characteristics as shown by curve B in the figure. However, when the above-mentioned filter glass increases the CuO content to promote the near-infrared cutting effect, the spectral transmittance in the 400 to 500 nm range generally decreases and shows a tendency to green, and the spectral transmittance in the 600 to 700 nm range generally decreases.
The sharp cut characteristics deteriorate. In addition, since the base glass is phosphate glass, its weather resistance is insufficient and weathering occurs on the polished surface of the glass, making it difficult to use for long periods of time, and it is difficult to improve chemical durability. desired. [Object of the invention] The present invention has been made in consideration of the above circumstances, and
Efficiently transmits the wavelength range of 400 to 600 nm, and
Good sharp cut characteristics at 700nm,
Another object of the present invention is to provide a near-infrared cut filter glass having excellent chemical durability and a method for producing the same. [Summary of the Invention] In order to achieve the above object, the present invention is such that the content of alkali metal oxide is 0.2% by weight or less and the composition of the base glass is adjusted. i.e. P2O5 65-85 %, Al2O3 5-17 % by weight percentage,
MgO + ZnO + CaO2 ~ 12%, BaO + SrO2 ~ 10%,
B 2 O 3 +SiO 2 +ZrO 2 +TiO 2 +La 2 O 3 +Y 2 O 3 0.2～
10%, SO 3 10ppm to 1%, and CuO 0.5 to 8%. In addition, the raw materials are prepared so as to obtain the above glass composition, and 1 to 10% of SO 3 is added as sulfate to the raw materials.
This is a method for producing near-infrared cut filter glass containing % by weight and melting. CuO is added as a colorant and is an essential ingredient for near-infrared sharp cuts. P2O5 is the main component constituting the glass network,
Al 2 O 3 is an essential component to improve the chemical durability of phosphate glass. MgO, ZnO, CaO,
BaO and SrO are glass network modifying oxides, and are components for improving solubility and formability and preventing devitrification. B2O3 , SiO2 , ZrO2 , TiO2 , La2O3 ,
Y 2 O 3 is a component that improves chemical durability without affecting near-infrared sharp cuts. SO 3 is introduced by selecting blended raw materials related to alkali metals, alkaline earth metals, and copper and converting them into sulfates, and is a component that improves chemical durability. In addition, sulfate MSO 4 (M: alkali metal, alkaline earth metal, or copper) causes a chemical reaction during the melting process, resulting in MSO 4 → MO + SO 3 and SO 3 → SO 2 + O, and the generated oxygen O melts. Since it maintains the glass inside as a strong oxidizer, it promotes the coloring of Cu 2+ ions and has a remarkable effect on sharp cutting properties of near-infrared rays. Next, the reason why the glass composition of the present invention is limited to the above range will be explained. When P 2 O 5 is less than 65%, the transmittance at 400 nm decreases, and when it exceeds 85%, it deteriorates the chemical durability of phosphate glass. If Al 2 O 3 is less than 5%, the chemical durability will decrease, and if it exceeds 17%, the transmittance in the ultraviolet region will decrease and the meltability will deteriorate. When the total amount of one or more of MgO, ZnO, and CaO is less than 2%, chemical durability and moldability deteriorate, and when it exceeds 12%, the infrared sharp cutting performance of CuO is inhibited. If BaO or SrO is used alone or in a combined amount of less than 2%, good near-infrared sharp cutting performance cannot be obtained, and if it exceeds 10%, devitrification occurs in the glass. B 2 O 3 , SiO 2 , ZrO 2 , TiO 2 , La 2 O 3 , Y 2 O 3 is 1
If the total amount of the species or two or more species exceeds 10%, the glass will have devitrification properties and the near-infrared sharp cut performance will deteriorate. If SO 3 is less than 10 ppm, it has no effect on improving chemical durability, and if it exceeds 1%, absorption in the visible range increases, which is not preferable. If CuO is less than 0.5%, a good near-infrared sharpening effect cannot be obtained, and if it exceeds 8%, the transmittance in the entire visible range decreases. It is desirable not to include Na 2 O, K 2 O, and Li 2 O as they reduce chemical durability, but their inclusion as impurities in other raw materials is unavoidable.
Up to 0.2% is allowed. Next, in the glass manufacturing method of the present invention, the reason why SO 3 to be included as a sulfate in the raw materials is limited to 1 to 10% by weight will be explained. If SO 3 introduced as sulfate is less than 1%,
A decomposition reaction occurs during the melting process, resulting in little effect in maintaining an oxidizing atmosphere, and if it exceeds 10%, it will foam significantly during melting, overflowing from the crucible, and making melting difficult. In addition, there are many bubbles remaining in the glass.
By containing 1 to 10% by weight of SO 3 , SO 3 remains in the glass of the present invention until the melting is completed, maintains an oxidizing atmosphere, improves near-infrared sharp cutting properties by CuO, and improves the glass Improves durability. [Examples of the invention] Examples of the invention are shown in the following table. No.1 to No.9 in the table
are examples, No. 10 to No. 12 are comparative examples, and the glass compositions are shown in weight percentages. The water resistance is shown by the method for measuring chemical durability of optical glass as specified by the Japan Optical Glass Industry Association.
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、Na2O、K2O、Li2O等のアルカリ金属酸
化物の含有量を0.2％以下に抑え、ZrO2、
TiO2La2O3、Y2O3の１種または２種以上、およ
びSO3を適当量含有せしめたもので、化学的耐久
性を向上させる利点を有し、かつ400〜600nｍの
可視域を効率よく透過し、600〜700nｍの波長域
をシヤープカツトするすぐれた効果を有してい
る。
As described above, the glass of the present invention is a near-infrared cut filter glass in which CuO is added to phosphate glass, and the content of alkali metal oxides such as Na 2 O, K 2 O, Li 2 O, etc. is 0.2% or less. ZrO 2 ,
Contains one or more of TiO 2 La 2 O 3 , Y 2 O 3 , and an appropriate amount of SO 3 , and has the advantage of improving chemical durability, and has a visible range of 400 to 600 nm. It has an excellent effect of transmitting light efficiently and sharply cutting the wavelength range of 600 to 700 nm.
第１図は本発明ガラスおよび従来ガラスの分光
透過率特性を示す曲線図、第２図は撮像管の感光
素子の分光感度特性を示す曲線図である。
Ａ……本発明ガラス（実施例No.４）、Ｂ……従
来ガラス（比較例No.11）。
FIG. 1 is a curve diagram showing the spectral transmittance characteristics of the glass of the present invention and the conventional glass, and FIG. 2 is a curve diagram showing the spectral sensitivity characteristics of the photosensitive element of the image pickup tube. A... Glass of the present invention (Example No. 4), B... Conventional glass (Comparative Example No. 11).
Claims (1)
MgO＋ZnO＋CaO2〜12％、BaO＋SrO2〜10％、
B2O3＋SiO2＋ZrO2＋TiO2＋La2O3＋Y2O30.2〜
10％、SO310ppm〜１％、CuO0.5〜８％なる組
成を有する近赤外カツトフィルタガラス。 ２ 重量百分率でP2O565〜85％、Al2O35〜17％、
MgO＋ZnO＋CaO2〜12％、BaO＋SrO2〜10％、
B2O3＋SiO2＋ZrO2＋TiO2＋La2O3＋Y2O30.2〜
10％、SO310ppm〜１％、CuO0.5〜８％なる組
成が得られるように原料を調合し、かつ原料中に
硫酸塩としてSO3を１〜10重量％含有させて溶融
する近赤外カツトフイルタガラスの製造法。[Claims] 1. P 2 O 5 65-85%, Al 2 O 3 5-17% in weight percentage,
MgO + ZnO + CaO2 ~ 12%, BaO + SrO2 ~ 10%,
B 2 O 3 +SiO 2 +ZrO 2 +TiO 2 +La 2 O 3 +Y 2 O 3 0.2～
Near-infrared cut filter glass having a composition of 10%, SO 3 10ppm to 1%, and CuO 0.5 to 8%. 2 P2O5 65-85 %, Al2O3 5-17 % by weight percentage,
MgO + ZnO + CaO2 ~ 12%, BaO + SrO2 ~ 10%,
B 2 O 3 +SiO 2 +ZrO 2 +TiO 2 +La 2 O 3 +Y 2 O 3 0.2～
The near-red color is prepared by blending raw materials to obtain a composition of 10% SO 3 , 10ppm to 1% CuO, and 0.5 to 8% CuO, and melting the raw materials by adding 1 to 10% by weight of SO 3 as sulfate. Method for manufacturing outer cut filter glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29544185A JPS62153144A (en) | 1985-12-25 | 1985-12-25 | Near infrared cutting filter glass and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29544185A JPS62153144A (en) | 1985-12-25 | 1985-12-25 | Near infrared cutting filter glass and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62153144A JPS62153144A (en) | 1987-07-08 |
| JPH048387B2 true JPH048387B2 (en) | 1992-02-14 |
Family
ID=17820630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29544185A Granted JPS62153144A (en) | 1985-12-25 | 1985-12-25 | Near infrared cutting filter glass and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62153144A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01242440A (en) * | 1988-03-23 | 1989-09-27 | Toshiba Glass Co Ltd | Cut-off filter glass for near infrared rays |
| DE4031469C1 (en) * | 1990-10-05 | 1992-02-06 | Schott Glaswerke, 6500 Mainz, De | |
| DE69942918D1 (en) | 1998-05-15 | 2010-12-16 | Toyo Boseki | Infrared absorbing filter |
| KR100444332B1 (en) | 1999-12-20 | 2004-08-16 | 도요 보세키 가부시키가이샤 | Infrared absorption filter |
| DE102004011520A1 (en) * | 2004-03-08 | 2005-10-06 | Schott Ag | Antimicrobial refractive index adapted phosphate 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 |
| US12466763B2 (en) | 2019-11-14 | 2025-11-11 | Nippon Electric Glass Co., Ltd. | Glass article |
-
1985
- 1985-12-25 JP JP29544185A patent/JPS62153144A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62153144A (en) | 1987-07-08 |
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