EP0797238B1 - Peinture opaque à la lumière pour lampes, film opaque à la lumière pour lampes et leur procédé de fabrication - Google Patents

Peinture opaque à la lumière pour lampes, film opaque à la lumière pour lampes et leur procédé de fabrication Download PDF

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Publication number
EP0797238B1
EP0797238B1 EP19970104628 EP97104628A EP0797238B1 EP 0797238 B1 EP0797238 B1 EP 0797238B1 EP 19970104628 EP19970104628 EP 19970104628 EP 97104628 A EP97104628 A EP 97104628A EP 0797238 B1 EP0797238 B1 EP 0797238B1
Authority
EP
European Patent Office
Prior art keywords
light
lamps
screening film
set forth
paint
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
Application number
EP19970104628
Other languages
German (de)
English (en)
Other versions
EP0797238A2 (fr
EP0797238A3 (fr
Inventor
Tatsuo c/o Matsushita El.Ind.Co.Ltd. Mifune
Kazunori c/o Matsushita El.Ind.Co.Ltd. Sakamoto
Tsumoru c/o Matsushita El.Ind.Co.Ltd. Ohata
Masaru c/o Matsushita El.Ind.Co.Ltd. Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP06236696A external-priority patent/JP3444086B2/ja
Priority claimed from JP30540596A external-priority patent/JPH10147736A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0797238A2 publication Critical patent/EP0797238A2/fr
Publication of EP0797238A3 publication Critical patent/EP0797238A3/fr
Application granted granted Critical
Publication of EP0797238B1 publication Critical patent/EP0797238B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the present invention relates to a light-screening film paint for lamps, and to a method for producing a light-screening film having the features of the preambles of claims 1 and 13, respectively.
  • a film paint and a method having the features of the preambles of claims 1 and 13, respectively, are known from both prior art documents DD-A-102 010 and of EP-A-0 739 534, which is relevant pursuant to Articles 54(3) and (4) EPC.
  • FIG. 1 shows a structural drawing of a highly luminous D2R-type discharge lamp for automobile front lamp.
  • the discharge lamp for automobiles is so arranged as that a metal iodide sealed in a quartz emissive section 5 emits a light under application of a high tension between the metal tungsten electrodes 1a and 1b.
  • the emissive section 5 is covered with an external quartz tube 2.
  • this halogen lamp is advantageous in providing a threefold luminosity at a 70% consumed power. Beside, because of using no filament unlike halogen lights, the service life is very long and not shorter than 1,500 hours.
  • a light-screening film 4 is formed on the surface of a outer quartz tube 2 to control the project region of light.
  • This light-screening film is about 20 ⁇ m thick, the shape and size of which are specified in according with the International Standard.
  • the present invention refers also to a producing method for this light-screening film.
  • a conventional light-screening film for lamps has been formed by mixing a pigment and a binder to form a paint, applying this paint to the glass surface of a lamp and firing the coat at a temperature of 100°C to 250°C
  • the temperature of the glass surface of a lamp rises and accordingly that of the light-screening film formed thereon also rises.
  • the temperature of the glass surface of the lamp rises to about 700°C during the lighting and necessarily the light-screening film on the glass surface is also exposed to a temperature of 700°C.
  • a light-screening film uses ferric oxide or the like as pigment. Though being black at room temperature, cupric oxide is known to turn into red powder with the progress of oxidation at about 350°C.
  • the present invention employs a light-screening film paint according to claim 1 and a method according to claim 13. Preferred embodiments are disclosed in the dependent claims.
  • a paint film is formed on the glass surface by binder action of methyl cellulose, vinyl alcohol and acrylic resin.
  • methyl cellulose functions to inhibit the sedimentation, coagulation or separation of pigment powder in a paint, whereby the paint can be stabilized by adding 0.2 to 2 parts thereof to 100 parts of powder quantity.
  • thixotropy can be afforded to a paint, so that a stable application of the paint by using a coater becomes possible.
  • methyl cellulose, vinyl alcohol and acrylic resin are thermally decomposed and consequently their residue in the paint film vanishes.
  • powder glass contained in the paint melts and functions as a binder. More preferably, by using glass mainly comprising zinc oxide and silica as powder glass, a light-screening film is obtained which has a high adhesion strength to the surface of quartz glass. And more preferably, by using powder glass having a melting point of not higher than 1000°C and setting the firing temperature at not higher than 1000°C, the deterioration of lamp performance can be prevented.
  • the difference in thermal expansion coefficient from a quartz glass tube decreases and the peeling of a light-screening film due to local ups and downs of temperature caused by the lighting and extinction of a lamp hardly occurs.
  • the deterioration of light-screening film strength due to a rise in temperature caused by the lighting of a lamp after the firing can be prevented.
  • the metal electrode material for a main lamp body is kept from being oxidized, so that a light-screening film can be formed without deterioration of the lamp performance.
  • 100g of manganese oxide having a grain size distribution of 1 ⁇ m to 20 ⁇ m, 100g of iron oxide powder containing about 20 % by weight of manganese added for obtaining iron oxide from iron hydroxide and having a grain size distribution of 0.3 ⁇ m to 3 ⁇ m, and 100g of powder glass containing about 70 % by weight of zinc oxide, aluminum oxide and silica were dry-mixed in an agate mortar for one hour to make a mixture.
  • the powder glass employed is one which melts at about 700°C and crystallizes as the temperature is raised up to 750°C.
  • the light-screening film paint prepared in this way was applied to the quartz glass surface of a lamp by means of a coater and fired at 800°C for an hour after transient drying at 100°C. Firing was conducted under the vacuum atmosphere of 1 x 10 -4 Torr.
  • the light-screening film formed in this way on the glass surface of a highly luminous discharge lamp has a high adhesion strength to the lamp and the color of the whole film was black.
  • the light-screening film obtained was estimated by discoloration measurement after the lighting, film strength measurement, transmissibility measurement, and surface observation after the lighting.
  • a change in the color of a light-screening film was measured with a chroma meter and estimated in accordance with the Lab method. From changes in the respective values of L, a and b, ⁇ Eab was calculated. The passable levels for estimation were set at a ⁇ Eab value determined to be not greater than 1, calculated from measurements of the color of a light-screening film before lighting and after an 1,500-hours duration of lighting.
  • the film strength determined by the cross cut test according to the JIS (Japanese Industrial Standards) Z 1522, was examined respectively before lighting and after an 1,500-hours duration of lighting.
  • a light-screening film was cut into specimens with a diamond cutter and tapes were pasted to the respective specimens and peeled.
  • the peeling degree of the light-screening film observed at that time was examined. Only those in which no peeling whatever was observed were determined as the passable level.
  • the passable level for transmittance measurements was taken at a leaking light ratio of not greater than 0.5%.
  • FIG. 2 shows the result of discoloration measurements of the light-screening film obtained in the above embodiment.
  • a light-screening film according to the present invention has a much smaller degree of discoloration than that of a conventional one using cupric oxide as pigment and manifested a ⁇ Eab value of not greater than 1 after an 1,500-hours duration of lighting.
  • FIG. 3 shows mixing ratios of the mixture of manganese oxide powder and iron oxide powder containing about 20% by weight of manganese to powder glass mainly containing zinc oxide, and the estimation results of the obtained light-screening films. This result revealed that a good light-screening film can be obtained by mixing 30 to 100 parts of powder glass mainly containing zinc oxide with 100 parts of the mixture of manganese oxide powder and manganese-contained iron oxide powder.
  • the manganese content in manganese-contained iron oxide was 20%, but results similar to the one obtained in the above embodiment were obtained also at other ratios.
  • FIG. 4 shows these results. From FIG. 4 the most appropriate content of manganese was found to range from 5 mol% to 30 mol%.
  • powder glass mainly containing zinc oxide was employed, but powder glass mainly comprising any of zinc oxide or boron oxide or aluminum oxide or silica provided a light-screening film equivalent to the one obtained in the above embodiment.
  • powder glass that begins to melt at 700°C and is crystallized at 750°C was employed, but a light-screening films equivalent to the one obtained in the above embodiment were obtained for powder glass having other softening points.
  • FIG. 5 shows these results.
  • the firing temperature was set to the softening temperature plus 100°C. From FIG. 5 it proved appropriate that the melting point of the powder glass employed ranges from 600°C to 1,100°C, both inclusive, and the firing temperature is not higher than 1,200°C.
  • thixocity was afforded to a paint by adding one part of silica powder having a grain size of not greater than 100nm to 100 parts of powder quantity, but equivalent results were obtained also on using swelling clay minerals such as smectite containing silica in place of silica powder.
  • the powder quantity referred to here is the total quantity of a mixture comprising manganese oxide and manganese contained iron oxide and powder glass.
  • Silica powder having a larger grain size that 100nm provides no desired effect.
  • FIG. 6 revealed that 0.2 part to 2 parts of added amount to 100 parts of powder quantity is suitable for the attainment of a stable coating by the prevention of liquid dripping or the like.
  • FIG. 6 shows the results examined on swelling clay minerals containing silica, but equivalent results were obtained also for silica powder having a grain size of not greater than 100nm.
  • FIG. 7 shows the results of correspondence between the added amount of methyl cellulose.
  • the results of FIG. 7 revealed that the added amount of methyl cellulose is preferably 0.2 to 2 parts to 100 parts of powder quantity.
  • FIG. 7 shows the results in the case of methyl cellulose, but equivalent results were obtained also on using vinyl alcohol or acrylic resin in place of this.
  • firing was conducted in the atmosphere of 1 x 10 -4 Torr.
  • the degree of vacuum was found to be preferably not higher than 1 x 10 -2 Torr.
  • a favorable effect in a light-screening film formed on the glass surface of a highly luminous discharge lamp was obtained that the adhesion strength to a lamp is strong, the color of the whole film is black and neither peeling nor discoloration of the light-screening film occurs even after a 200-hours duration of lighting.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Surface Treatment Of Glass (AREA)
  • Paints Or Removers (AREA)

Claims (24)

  1. Peinture en film opaque à la lumière, destinée à des lampes, comprenant :
    au moins un composé parmi, soit un oxyde de manganèse, soit un oxyde de fer, et
    du verre en poudre contenant au moins l'un des composés respectivement de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium,
       caractérisée en ce que
       ledit composé contient 5 % en moles à 30 % en moles de manganèse.
  2. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1,
       caractérisée par
    un composé d'oxyde de manganèse, d'oxyde de fer et d'oxyde de zinc, et
    un verre contenant au moins un composé respectivement de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium.
  3. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle l'eau est employée comme solvant.
  4. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, comprenant en outre au moins l'un des composés parmi la méthylcellulose, l'alcool vinylique et une résine acrylique, respectivement.
  5. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle de la silice présentant une taille de grain principale, qui n'est pas supérieure à 100 nm, est ajoutée.
  6. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle un minéral d'argile contenant de la silice présentant une taille de grain principale, qui n'est pas supérieure à 100 nm, est ajouté.
  7. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle la fraction solide n'est pas inférieure à 40 % en poids.
  8. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle le point de fusion du verre en poudre n'est pas supérieur à 1 200 °C.
  9. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 4, dans laquelle la quantité du composé d'au moins l'un parmi la méthylcellulose, l'alcool vinylique et une résine acrylique va de 0,2 partie à 2 parties par rapport à 100 parties de la quantité de poudre.
  10. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle le coefficient de dilatation thermique du verre en poudre n'est pas supérieur à 10-6.
  11. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle le verre réduit en poudre, devant être cristallisé par chauffage, est employé en tant que verre en poudre en vue de préparer ladite peinture en film opaque à la lumière.
  12. Peinture en film opaque à la lumière, destinée à des lampes, selon la revendication 1, dans laquelle par rapport à 100 parties d'au moins un composé parmi, soit un oxyde de manganèse, soit un oxyde de fer, contenant 5 % en moles à 30 % en moles de manganèse, le rapport de mélange dudit verre en poudre contenant au moins l'un des composés respectivement de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium, va de 30 parties en poids à 100 parties en poids.
  13. Procédé de fabrication d'un film opaque à la lumière (4) destiné à des lampes, comprenant les étapes suivantes :
    préparation d'une peinture opaque à la lumière destinée à des lampes, ladite peinture opaque à la lumière comprend au moins un composé parmi, soit un oxyde de manganèse, soit un oxyde de fer et en outre du verre en poudre contenant au moins un composé, respectivement, de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium,
    application de la peinture ci-dessus sur la surface d'une lampe,
    formation d'un film opaque à la lumière (4) par cuisson à des températures qui ne sont pas supérieures à 1 200 °C,
       caractérisé en ce que
       ledit composé contient 5 % en moles à 30 % en moles de manganèse.
  14. Procédé de fabrication d'un film opaque à la lumière 4 destiné à des lampes, selon la revendication 13, dans lequel l'eau est employée comme solvant.
  15. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel un composé d'au moins l'un parmi la méthylcellulose, l'alcool vinylique et une résine acrylique est ajouté à ladite peinture en film opaque à la lumière.
  16. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel de la silice présentant une taille de grain principale qui n'est pas supérieure à 100 nm est ajoutée.
  17. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel un minéral d'argile contenant de la silice présentant une taille de grain principale qui n'est pas supérieure à 100 nm est ajouté.
  18. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel la fraction solide n'est pas inférieure à 40 % en poids.
  19. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel le point de fusion du verre en poudre n'est pas supérieur à 1 200 °C.
  20. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 15, dans lequel la quantité du composé d'au moins l'un parmi la méthylcellulose, l'alcool vinylique et une résine acrylique va de 0,2 partie à 2 parties par rapport à 100 parties de la quantité de poudre.
  21. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel la cuisson de ladite peinture est mise à se poursuivre dans une atmosphère de vide qui n'est pas supérieure à 10-2 Torr.
  22. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel le coefficient de dilatation thermique du verre en poudre n'est pas supérieur à 10-6.
  23. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel le verre en poudre devant être cristallisé par chauffage est employé en tant que verre en poudre en vue de préparer ladite peinture en film opaque à la lumière.
  24. Procédé de fabrication d'un film opaque à la lumière 4, destiné à des lampes, selon la revendication 13, dans lequel par rapport à 100 parties d'au moins un composé parmi, soit un oxyde de manganèse, soit un oxyde de fer, contenant 5 % en moles à 30 % en moles de manganèse, le rapport de mélange dudit verre en poudre contenant au moins l'un des composés respectivement de silice, d'oxyde de zinc, d'oxyde de bore et d'oxyde d'aluminium, va de 30 parties en poids à 100 parties en poids.
EP19970104628 1996-03-19 1997-03-18 Peinture opaque à la lumière pour lampes, film opaque à la lumière pour lampes et leur procédé de fabrication Expired - Lifetime EP0797238B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP06236696A JP3444086B2 (ja) 1996-03-19 1996-03-19 塗料とそれを用いたランプの遮光膜およびその製造方法
JP62366/96 1996-03-19
JP6236696 1996-03-19
JP30540596 1996-11-18
JP30540596A JPH10147736A (ja) 1996-11-18 1996-11-18 遮光膜用塗料と遮光膜付きランプとその製造方法
JP305405/96 1996-11-18

Publications (3)

Publication Number Publication Date
EP0797238A2 EP0797238A2 (fr) 1997-09-24
EP0797238A3 EP0797238A3 (fr) 1997-12-10
EP0797238B1 true EP0797238B1 (fr) 2001-10-17

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Application Number Title Priority Date Filing Date
EP19970104628 Expired - Lifetime EP0797238B1 (fr) 1996-03-19 1997-03-18 Peinture opaque à la lumière pour lampes, film opaque à la lumière pour lampes et leur procédé de fabrication

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Country Link
EP (1) EP0797238B1 (fr)
CN (1) CN1101433C (fr)
DE (1) DE69707332T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000001338A (ja) 1998-06-15 2000-01-07 Matsushita Electric Ind Co Ltd 放電型ランプ用遮光膜およびその製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6918887A (fr) * 1969-12-17 1971-06-21
DE2136012A1 (de) * 1971-07-19 1973-02-01 Patra Patent Treuhand Elektrische lampe mit lichtabdeckendem ueberzug
DD102010A1 (fr) * 1973-01-15 1973-11-20
US4288713A (en) * 1979-11-23 1981-09-08 Gte Products Corporation Lamp having opaque coating
JP2761155B2 (ja) * 1992-07-08 1998-06-04 株式会社小糸製作所 自動車用灯具の光源用放電ランプ装置
ES2121630T3 (es) * 1994-11-10 1998-12-01 Koninkl Philips Electronics Nv Lampara electrica.

Also Published As

Publication number Publication date
CN1163292A (zh) 1997-10-29
DE69707332T2 (de) 2002-05-02
CN1101433C (zh) 2003-02-12
EP0797238A2 (fr) 1997-09-24
DE69707332D1 (de) 2001-11-22
EP0797238A3 (fr) 1997-12-10

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