JPH027995B2 - - Google Patents
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- Publication number
- JPH027995B2 JPH027995B2 JP63033024A JP3302488A JPH027995B2 JP H027995 B2 JPH027995 B2 JP H027995B2 JP 63033024 A JP63033024 A JP 63033024A JP 3302488 A JP3302488 A JP 3302488A JP H027995 B2 JPH027995 B2 JP H027995B2
- Authority
- JP
- Japan
- Prior art keywords
- green
- phosphor
- coo
- nio
- tio
- 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
（産業上の利用分野）
本発明は、螢光体粒子表面に顔料粒子が付着さ
れた緑色発光螢光体（以下、顔料付着緑色発光螢
光体と略す）に係り、特にテレビジヨンの陰極線
管用の顔料付着緑色発光螢光体に関する。
（従来の技術）
近年、テレビジヨンのカラーブラウン管のコン
トラストを向上させるために、螢光体粒子表面に
その螢光体が発光する色と同色の顔料粒子を被覆
した螢光体が、広く使用されている。即ち、被覆
される顔料粒子の色フイルター効果により発光色
の色純度を向上させ、顔料粒子による吸収効果に
よりコントラストの向上を図るものである。
通常、青色発光螢光体の粒子表面にはCoO・
Al2O3又は群青顔料粒子が被覆され、赤色発光螢
光体の粒子表面にはFe2O3又はCd（Ｓ，Se）顔料
粒子が被覆されている。
一方、緑色発光螢光体については、その体色が
黄緑色であるため、顔料は被覆されずに使用され
ていたが、最近、緑色発光螢光体の体色をより緑
色に近付けるため、緑色発光螢光体粒子表面に緑
色顔料粒子を被覆することが提案されている（特
開昭53―136039）。
しかし、緑色発光螢光体粒子表面に緑色顔料粒
子を被覆しても、螢光体の体色は黄色味のある緑
色にしかならず、深緑色にすることは不可能であ
つた。
（発明が解決しようとする課題）
本発明の目的は、発光出力の低下の少ない、深
緑色の体色の顔料付緑色発光螢光体を提供するこ
とにある。
（課題を解決するための手段）
本発明者は、鋭意研究を重ねた結果、緑色発光
螢光体粒子表面に所定の青緑色顔料粒子を被覆す
ることにより、上記目的を達成し得ることを見出
だし、本発明をなすに至つた。
即ち、本発明は、中央粒子径が３〜12μmの硫
化物螢光体及び酸硫化物螢光体のうちの少なくと
も１種である緑色発光螢光体の粒子表面に、螢光
体重量の0.01〜５重量％の中央粒子径が0.01〜
2μmのTiO2―CoO―NiO―Li2O系青緑色顔料粒
子が被覆されてなる顔料付緑色発光螢光体を提供
するものである。
緑色発光螢光体粒子の中央粒子径が3μm未満の
場合には、発光輝度の点で好ましくなく、12μm
を越えると、塗布特性上、実用的に好ましくな
い。
また、青緑色顔料粒子の中央粒子径が0.01μm
未満の場合には、白みを帯びて深緑色が得られ
ず、2μmを越えると、顔料の隠蔽力が低下するた
め顔料の添加量を増加させねばならず、好ましく
ない。
更に、緑色発光螢光体粒子表面に被覆される青
緑色顔料粒子の量が0.01重量％未満の場合には、
着色が少なくなり、５重量％を越えると、発光出
力の低下が大きくなり、好ましくない。
前記硫化物螢光体は、ZnS又は（ZnCd）Ｓを
母体とし、付活剤としてCuおよびAuのうちの少
なくとも１種、共付括剤としてAlを用いたもの
であり、前記酸硫化物螢光体はLn2O2S（Ln＝Ｙ、
La、Gd、Lu）を母体とし、付活剤としてTb単
独あるいはTbに共付括剤としてDy、Ce、Pr、
Tmのうちの少なくとも１種を用いたものであ
る。
また、前記TiO2―CoO―NiO―Li2O系青緑色
顔料の各成分の組成はTiO2が58.5〜71.5重量％、
CoOが16.2〜19.8重量％、NiOが９〜11重量％、
Li2Oが6.3〜7.7重量％である。
各成分の量がこれらの範囲外の場合には、目的
とする深緑色の体色とすることが出来ない。
更に、前記TiO2―CoO―NiO―Li2O系青緑色
顔料粒子の反射率は、BaSO4の反射率を100％と
した場合に400nm、450nm、500nm、550nm、
600nm、650nm及び700nmの波長の光に対してそ
れぞれ５〜15％、20〜30％、40〜50％、20％以
下、15％以下及び10〜20％である。
青緑色顔料粒子の反射率がこれらの範囲外の場
合には、発光出力の低下が大きくなるとともに、
着色力が低下する。
（作用）
第１図は、本発明に用いられるTiO2―CoO―
NiO―Li2O系青緑色顔料TiO2―CoO―NiO―
Li2O系青緑色顔料の分光反射率を、従来用いら
れていたTiO2―ZnO―CoO―NiO系緑色顔料の
分光反射率と比較して示すグラフである。第１図
において、曲線ＡはTiO2―CoO―NiO―Li2O系
青緑色顔料の分光反射率を、曲線ＢはTiO2―
ZnO―CoO―NiO系緑色顔料の分光反射率をそれ
ぞれ示す。
第１図のグラフから明らかなように、TiO2―
CoO―NiO―Li2O系青緑色顔料の反射率は、
550nm以上の波長（黄色から赤色の波長）では
TiO2―ZnO―CoO―NiO系緑色顔料の反射率と
ほぼ同等であるが、500nm以下の波長（青緑色か
ら青色の波長）ではTiO2―ZnO―CoO―NiO系
緑色顔料の反射率よりも高い。このことは、
TiO2―ZnO―CoO―NiO系緑色顔料の体色が青
緑色であることを示している。
このような青緑色を呈するTiO2―CoO―NiO
―Li2O系顔料を緑色発光螢光体の粒子表面に被
覆すると、顔料の青色成分と螢光体の体色の黄色
成分とが合成されて、螢光体は深緑色を呈するに
至る。
更に、顔料を螢光体の粒子表面に被覆すると、
通常は発光出力が低下するのであるが、本発明で
用いるTiO2―CoO―NiO―Li2O系青緑色顔料は、
発光主波長である530〜535nmの反射率が従来の
TiO2―ZnO―CoO―NiO系緑色顔料に比べ高い
（即ち、隠蔽力が低い）ため、螢光体の発光が妨
げられず、発光出力の低下は少ない。
（実施例）
以下に本発明の実施例を示し、本発明をより詳
細に説明する。
各実施例においては、本発明に係るTiO2―
CoO―NiO―Li2O系青緑色顔料としては、ダイ
ピロキサイド＃9315（大日精化社製）を用い、比
較試料であるTiO―ZnO―CoO―NiO2系緑色顔
料としては、ダイピロキサイド＃9320（大日精化
社製）を用いた。
なお、反射率測定のための基準物質としては
BaSO4を用い、体色の測定は、色彩色差計CR―
100（ミノルタ社製）を用いて行なつた。
実施例 １
緑色発光螢光体（ZnS：Cu、Au、Al）100ｇ
を水300ml中に分散させ、TiO2―CoO―NiO―
Li2O系青緑色顔料0.2ｇを加え、更にアクリルエ
マルジヨン１mlを加えた後、30分撹拌を続けた。
その後、２％HClを滴下してPH３とし、螢光体及
び顔料を沈澱させた。沈澱を濾別した後、乾燥及
びふるい分けを行ない、実施例１の螢光体を得
た。
また、これと比較するため、TiO2―ZnO―
CoO―NiO系緑色顔料を用いたことを除き、同様
にして比較例１の螢光体を得た。
これらの螢光体の特性を測定したところ下記表
―１に示す結果を得た。
下記表―１から明らかなように、実施例１の螢
光体は、体色色度座標におけるａ値及びｂ値が減
少している。ａ値の減少は、赤色成分が減少し、
緑色成分が増加することを意味し、ｂ値の減少
は、黄色成分が減少し、青色成分が増加すること
を意味する。
即ち、従来の顔料付緑色発光螢光体が黄緑色を
呈するのに対し、本発明の顔料付緑色発光螢光体
は深い緑色を呈することがわかる。
また、実施例１の螢光体は、発光出力の低下も
５％と低く、比較例１の螢光体の発光出力の低下
８％に比べ、40％も改善された。
(Industrial Application Field) The present invention relates to a green-emitting phosphor in which pigment particles are attached to the surface of the phosphor particles (hereinafter abbreviated as a pigment-attached green-emitting phosphor), and particularly for use in cathode ray tubes of televisions. The invention relates to a pigmented green emitting phosphor. (Prior Art) In recent years, in order to improve the contrast of color cathode ray tubes for television, phosphors whose surfaces are coated with pigment particles of the same color as the color emitted by the phosphor have been widely used. ing. That is, the color purity of the emitted light is improved by the color filter effect of the coated pigment particles, and the contrast is improved by the absorption effect of the pigment particles. Usually, the particle surface of blue-emitting phosphor has CoO.
Al 2 O 3 or ultramarine pigment particles are coated, and the particle surface of the red-emitting phosphor is coated with Fe 2 O 3 or Cd (S, Se) pigment particles. On the other hand, since green-emitting phosphors have a yellow-green body color, they were used without coating the pigment, but recently, in order to make the body color of green-emitting phosphors closer to green, green It has been proposed to coat the surface of light-emitting phosphor particles with green pigment particles (Japanese Patent Application Laid-Open No. 136039/1983). However, even if the surface of the green-emitting phosphor particles was coated with green pigment particles, the body color of the phosphor would only be yellowish green, and it was impossible to make it deep green. (Problems to be Solved by the Invention) An object of the present invention is to provide a pigmented green light-emitting phosphor with a dark green body color, which exhibits little reduction in luminous output. (Means for Solving the Problems) As a result of extensive research, the present inventor found that the above object could be achieved by coating the surfaces of green-emitting phosphor particles with predetermined blue-green pigment particles. From this beginning, we have achieved the present invention. That is, in the present invention, 0.01 of the phosphor weight is applied to the particle surface of a green-emitting phosphor that is at least one of a sulfide phosphor and an oxysulfide phosphor having a median particle diameter of 3 to 12 μm. ~5% by weight median particle size is ~0.01
The object of the present invention is to provide a pigmented green light-emitting phosphor coated with 2 μm TiO 2 -CoO-NiO-Li 2 O-based blue-green pigment particles. If the median particle diameter of the green-emitting phosphor particles is less than 3 μm, it is unfavorable in terms of luminance, and it is less than 12 μm.
Exceeding this is practically unfavorable in terms of coating properties. In addition, the median particle diameter of the blue-green pigment particles is 0.01 μm.
If it is less than 2 μm, it becomes whitish and a deep green color cannot be obtained, and if it exceeds 2 μm, the hiding power of the pigment decreases, so the amount of pigment added must be increased, which is not preferable. Furthermore, if the amount of blue-green pigment particles coated on the surface of the green-emitting phosphor particles is less than 0.01% by weight,
Coloration decreases, and if it exceeds 5% by weight, the luminous output will decrease significantly, which is not preferable. The sulfide phosphor uses ZnS or (ZnCd)S as a matrix, uses at least one of Cu and Au as an activator, and Al as a co-binding agent. The light body is Ln 2 O 2 S (Ln=Y,
La, Gd, Lu) as a matrix, Tb alone as an activator or Tb as a co-binding agent with Dy, Ce, Pr,
At least one type of Tm is used. In addition, the composition of each component of the TiO 2 -CoO-NiO-Li 2 O-based blue-green pigment is 58.5 to 71.5% by weight of TiO 2 ,
CoO is 16.2-19.8% by weight, NiO is 9-11% by weight,
Li2O is 6.3-7.7% by weight. If the amount of each component is outside these ranges, the desired deep green body color cannot be achieved. Furthermore, the reflectance of the TiO 2 -CoO-NiO-Li 2 O-based blue-green pigment particles is 400 nm, 450 nm, 500 nm, 550 nm, when the reflectance of BaSO 4 is 100%.
5 to 15%, 20 to 30%, 40 to 50%, 20% or less, 15% or less, and 10 to 20% for light with wavelengths of 600 nm, 650 nm, and 700 nm, respectively. If the reflectance of the blue-green pigment particles is outside these ranges, the luminous output will decrease significantly, and
Coloring strength decreases. (Function) Figure 1 shows TiO 2 -CoO- used in the present invention.
NiO―Li 2 O-based blue-green pigment TiO 2 ―CoO―NiO―
2 is a graph showing the spectral reflectance of a Li 2 O-based blue-green pigment in comparison with the spectral reflectance of a conventionally used TiO 2 -ZnO-CoO-NiO-based green pigment. In Figure 1, curve A represents the spectral reflectance of TiO 2 -CoO-NiO-Li 2 O-based blue-green pigment, and curve B represents TiO 2 -
The spectral reflectance of ZnO-CoO-NiO-based green pigments is shown. As is clear from the graph in Figure 1, TiO 2 -
The reflectance of CoO―NiO―Li 2 O blue-green pigment is
At wavelengths above 550nm (yellow to red wavelengths)
The reflectance is almost the same as that of the TiO 2 -ZnO-CoO-NiO green pigment, but at wavelengths below 500 nm (wavelengths from blue-green to blue), the reflectance is higher than that of the TiO 2 -ZnO-CoO-NiO green pigment. expensive. This means that
This shows that the body color of the TiO 2 -ZnO-CoO-NiO-based green pigment is bluish-green. TiO 2 ―CoO―NiO exhibits this blue-green color
- When a Li 2 O pigment is coated on the particle surface of a green-emitting phosphor, the blue component of the pigment and the yellow component of the body color of the phosphor are synthesized, giving the phosphor a deep green color. Furthermore, when the pigment is coated on the surface of the phosphor particles,
Normally, the luminescence output decreases, but the TiO 2 -CoO-NiO-Li 2 O-based blue-green pigment used in the present invention
The reflectance of the main emission wavelength of 530 to 535 nm is lower than that of conventional
Since the TiO 2 -ZnO-CoO-NiO green pigment has a higher hiding power (that is, its hiding power is lower), the luminescence of the phosphor is not hindered, and the decrease in luminous output is small. (Example) Examples of the present invention will be shown below to explain the present invention in more detail. In each example, TiO 2 -
Dipyroxide #9315 (manufactured by Dainichiseika Kaisha, Ltd.) was used as the CoO-NiO-Li 2 O blue-green pigment, and Dipyroxide #9315 (manufactured by Dainichiseika Kaisha, Ltd.) was used as the comparison sample TiO-ZnO-CoO-NiO 2 green pigment. #9320 (manufactured by Dainichiseika Kaisha) was used. In addition, as a reference material for reflectance measurement,
Using BaSO 4 , body color was measured using a color difference meter CR-
100 (manufactured by Minolta). Example 1 Green-emitting phosphor (ZnS: Cu, Au, Al) 100g
Dispersed in 300ml of water, TiO 2 ―CoO―NiO―
After adding 0.2 g of Li 2 O-based blue-green pigment and further adding 1 ml of acrylic emulsion, stirring was continued for 30 minutes.
Thereafter, 2% HCl was added dropwise to adjust the pH to 3 to precipitate the phosphor and pigment. After filtering off the precipitate, the phosphor of Example 1 was obtained by drying and sieving. Also, for comparison, TiO 2 ―ZnO―
A phosphor of Comparative Example 1 was obtained in the same manner except that a CoO--NiO green pigment was used. When the characteristics of these phosphors were measured, the results shown in Table 1 below were obtained. As is clear from Table 1 below, the phosphor of Example 1 has decreased a values and b values in the body color chromaticity coordinates. A decrease in the a value means a decrease in the red component,
It means that the green component increases, and a decrease in the b value means that the yellow component decreases and the blue component increases. That is, it can be seen that while the conventional pigmented green-emitting phosphor exhibits a yellow-green color, the pigmented green-emitting phosphor of the present invention exhibits a deep green color. Furthermore, the phosphor of Example 1 also showed a low decrease in luminous output of 5%, which was an improvement of 40% compared to the 8% decrease in luminescent output of the phosphor of Comparative Example 1.
【表】
第２図は、本実施例における各螢光体の分光反
射率を示すグラフである。第２図において、曲線
Ｃは実施例１の螢光体の分光反射率、曲線Ｄは比
較例１の螢光体の分光反射率、曲線Ｅは顔料が被
覆されていない螢光体の分光反射率をそれぞれ示
す。
実施例 ２
緑色発光螢光体としてZnS：Cu、Alを用い、
顔料の添加量を１ｇとしたことを除き、実施例１
と同様にして実施例２及び比較例２の螢光体を得
た。
これらの螢光体の特性を測定したところ下記表
―２に示す結果を得た。即ち、実施例１と同様の
結果を得た。[Table] FIG. 2 is a graph showing the spectral reflectance of each phosphor in this example. In Figure 2, curve C is the spectral reflectance of the phosphor of Example 1, curve D is the spectral reflectance of the phosphor of Comparative Example 1, and curve E is the spectral reflectance of the phosphor without pigment coating. The percentage is shown for each. Example 2 Using ZnS:Cu, Al as a green-emitting phosphor,
Example 1 except that the amount of pigment added was 1 g.
In the same manner as above, phosphors of Example 2 and Comparative Example 2 were obtained. When the characteristics of these phosphors were measured, the results shown in Table 2 below were obtained. That is, the same results as in Example 1 were obtained.
【表】
実施例 ３
顔料の添加量を0.5ｇとしたことを除き、実施
例１と同様にして実施例３及び比較例３の螢光体
を得た。
これらの螢光体の特性を測定したところ下記表
―３に示す結果を得た。即ち、実施例１と同様の
結果を得た。
第３図は、本実施例における各螢光体の分光反
射率を示すグラフである。第３図において、曲線
Ｆは実施例３の螢光体の分光反射率、曲線Ｇは比
較例３の螢光体の分光反射率、曲線Ｈは顔料が被
覆されていない螢光体の分光反射率をそれぞれ示
す。[Table] Example 3 Phosphors of Example 3 and Comparative Example 3 were obtained in the same manner as in Example 1, except that the amount of pigment added was 0.5 g. When the characteristics of these phosphors were measured, the results shown in Table 3 below were obtained. That is, the same results as in Example 1 were obtained. FIG. 3 is a graph showing the spectral reflectance of each phosphor in this example. In Figure 3, curve F is the spectral reflectance of the phosphor of Example 3, curve G is the spectral reflectance of the phosphor of Comparative Example 3, and curve H is the spectral reflectance of the phosphor without pigment coating. The percentage is shown for each.
【表】
第４図は、実施例１〜３（曲線Ｉ）および比較
例１〜３（曲線Ｊ）の螢光体における、比反射率
と相対発光輝度の関係を示すグラフである。第４
図のグラフから、実施例１〜３の螢光体は、比較
例１〜３の螢光体と同等の着色力の場合に、高い
発光出力を示すことがわかる。
（発明の効果）
以上説明したように、本発明によると、緑色発
光螢光体の粒子表面に、所定のTiO2―CoO―
NiO―Li2O系青緑色顔料粒子を被覆することに
より、発光出力の低下のない、深緑色の体色の顔
料付緑色発光螢光体を得ることが可能である。[Table] FIG. 4 is a graph showing the relationship between specific reflectance and relative luminance in the phosphors of Examples 1 to 3 (curve I) and Comparative Examples 1 to 3 (curve J). Fourth
From the graph in the figure, it can be seen that the phosphors of Examples 1 to 3 exhibit high luminous output when the coloring power is equivalent to that of the phosphors of Comparative Examples 1 to 3. (Effects of the Invention) As explained above, according to the present invention, a predetermined TiO 2 -CoO-
By coating NiO--Li 2 O-based blue-green pigment particles, it is possible to obtain a pigmented green-emitting phosphor with a deep green body color without a decrease in luminous output.
第１図は、本発明に係るTiO2―CoO―NiO―
Li2O系青緑色顔料TiO2―CoO―NiO―Li2O系青
緑色顔料の分光反射率を、従来のTiO2―ZnO―
CoO―NiO系緑色顔料の分光反射率と比較して示
すグラフ、第２図は、実施例１における各螢光体
の分光反射率を示すグラフ、第３図は、実施例３
における各螢光体の分光反射率を示すグラフ、第
４図は、実施例１〜３および比較例１〜３の螢光
体における、比反射率と相対発光輝度の関係を示
すグラフである。
FIG. 1 shows TiO 2 -CoO-NiO- according to the present invention.
Li 2 O-based blue-green pigment TiO 2 ―CoO―NiO― The spectral reflectance of the Li 2 O-based blue-green pigment was compared with the conventional TiO 2 ―ZnO―
A graph showing a comparison of the spectral reflectance of CoO--NiO green pigment, FIG. 2 is a graph showing the spectral reflectance of each phosphor in Example 1, and FIG. 3 is a graph showing the spectral reflectance of each phosphor in Example 3.
FIG. 4 is a graph showing the relationship between the specific reflectance and relative luminance of the phosphors of Examples 1 to 3 and Comparative Examples 1 to 3.
Claims (1)
酸硫化物螢光体のうちの少なくとも１種である緑
色発光螢光体の粒子表面に、螢光体重量の0.01〜
５重量％の中央粒子径が0.01〜2μmのTiO2―CoO
―NiO―Li2O系青緑色顔料粒子が被覆されてな
り、前記硫化物螢光体はZnS又は（ZnCd）Ｓを
母体とし、付活剤としてCuおよびAuのうちの少
なくとも１種、共付活剤としてAlを用いたもの
であり、前記酸硫化物螢光体はLn2O2S（Ln＝Ｙ、
La、Gd、Lu）を母体とし、付活剤としてTb、
共付活剤としてDy、Cc、Pr、Tmのうちの少な
くとも１種を用いたものであり、前記TiO2―
CoO―NiO―Li2O系青緑色顔料の各成分の組成
はTiO2が58.5〜71.5重量％、CoOが16.2〜19.8重
量％、NiOが９〜11重量％、Li2Oが6.3〜7.7重量
％であり、前記TiO2―CoO―NiO―Li2O系青緑
色顔料粒子の反射率は、BaSO4の反射率を100％
とした場合に400nm、450nm、500nm、550nm、
600nm、650nm及び700nmの波長の光に対してそ
れぞれ５〜15％、20〜30％、40〜50％、20％以
下、15％以下及び10〜20％である顔料付緑色発光
螢光体。1. On the particle surface of a green-emitting phosphor that is at least one of a sulfide phosphor and an oxysulfide phosphor with a median particle diameter of 3 to 12 μm, a phosphor weight of 0.01 to 12 μm is applied.
5% by weight of TiO2 - CoO with a median particle size of 0.01-2μm
The sulfide phosphor is coated with NiO-Li 2 O-based blue-green pigment particles, and the sulfide phosphor has ZnS or (ZnCd)S as a matrix, and is coated with at least one of Cu and Au as an activator. Al is used as an activator, and the oxysulfide phosphor is Ln 2 O 2 S (Ln=Y,
La, Gd, Lu) as a matrix, Tb as an activator,
At least one of Dy, Cc, Pr, and Tm is used as a coactivator, and the TiO 2 -
The composition of each component of the CoO-NiO-Li 2 O-based blue-green pigment is 58.5 to 71.5% by weight of TiO 2 , 16.2 to 19.8% by weight of CoO, 9 to 11% by weight of NiO, and 6.3 to 7.7% by weight of Li 2 O. %, and the reflectance of the TiO2 -CoO-NiO- Li2O -based blue-green pigment particles is 100% of the reflectance of BaSO4 .
400nm, 450nm, 500nm, 550nm,
Pigmented green light-emitting phosphors which are 5-15%, 20-30%, 40-50%, 20% or less, 15% or less and 10-20% for light of wavelengths 600nm, 650nm and 700nm, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3302488A JPH01207382A (en) | 1988-02-16 | 1988-02-16 | Green luminescent fluophor covered with pigment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3302488A JPH01207382A (en) | 1988-02-16 | 1988-02-16 | Green luminescent fluophor covered with pigment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01207382A JPH01207382A (en) | 1989-08-21 |
| JPH027995B2 true JPH027995B2 (en) | 1990-02-21 |
Family
ID=12375221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3302488A Granted JPH01207382A (en) | 1988-02-16 | 1988-02-16 | Green luminescent fluophor covered with pigment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01207382A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827832A (en) * | 1981-08-12 | 1983-02-18 | Hino Motors Ltd | Exhaust brake device |
| JPS6041106A (en) * | 1983-08-16 | 1985-03-04 | Yamazaki Mazak Corp | Servo positioning method |
-
1988
- 1988-02-16 JP JP3302488A patent/JPH01207382A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01207382A (en) | 1989-08-21 |
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