EP0141402B1 - Method for the manufacturing of an electric incandescent lamp - Google Patents

Method for the manufacturing of an electric incandescent lamp Download PDF

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Publication number
EP0141402B1
EP0141402B1 EP84113117A EP84113117A EP0141402B1 EP 0141402 B1 EP0141402 B1 EP 0141402B1 EP 84113117 A EP84113117 A EP 84113117A EP 84113117 A EP84113117 A EP 84113117A EP 0141402 B1 EP0141402 B1 EP 0141402B1
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EP
European Patent Office
Prior art keywords
bulb
bowl
coating
lamp
visible radiation
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
Application number
EP84113117A
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German (de)
French (fr)
Other versions
EP0141402A3 (en
EP0141402A2 (en
Inventor
Kurt Schönsee
Joachim Oehmke
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to AT84113117T priority Critical patent/ATE35482T1/en
Publication of EP0141402A2 publication Critical patent/EP0141402A2/en
Publication of EP0141402A3 publication Critical patent/EP0141402A3/en
Application granted granted Critical
Publication of EP0141402B1 publication Critical patent/EP0141402B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof

Definitions

  • the invention relates to a method for producing an electric light bulb with the features specified in the preamble of the main claim.
  • the light-scattering surface of the bulb top is usually produced by hydrofluoric acid matting of the lamp bulb. Internal siliciding is currently carried out using the wet process. Pre-matted standing lamp bulbs are slurried up to the largest bulb diameter with Si0 2 -containing paste, the bulb tip remaining unsludged.
  • the internal siliconization of lamp bulbs in the dry process is known, in which SiO z powder particles carried by a gas stream are blown into the lamp bulb and bound to the heated bulb glass in the electrostatic field. If the siliconizing layer is to extend only to certain parts of the inner wall of the piston, these deflecting means can be arranged in the gas stream carrying the powder particles.
  • a circular deflection shield is mounted, the side of which facing away from the coating nozzle is flat, while the side facing the nozzle has a convex shape.
  • the deflection shield lies above the coating nozzle and is arranged concentrically with it.
  • the stainless steel shield is supported with support rods which are anchored in the nozzle area (US Pat. No. 3,279,937).
  • the object of the invention is to make an electric incandescent lamp of the type described in the introduction simpler in construction and method of manufacture.
  • the object is achieved with the features listed in the characterizing part of claim 1.
  • the transition from one layer to the other is essentially sharp.
  • a layer thickness ratio of approximately 6: 1 (reflective first layer: light-scattering second layer) has proven to be particularly advantageous.
  • the layers are applied in one operation using the electrostatic method, a high voltage potential being applied between the lamp bulb and the coating nozzle.
  • the desired differences in layer density and layer thickness are achieved by means of a circular, flat deflection shield which is arranged above and concentrically with the coating nozzle in the region of the largest piston diameter and divides the powder flow. It is also essential for this method that the piston top of the heated piston is cooled during the coating.
  • a significant further advantage of this new type of coating process is that there is no need to matt the inside of the lamp bulb using hydrofluoric acid, which significantly reduces the environmental impact.
  • the lamp according to FIG. 1 has a mushroom-shaped lamp bulb 1, a base 2 and a luminous element 4 held in a frame 3.
  • the lamp bulb 1 is provided on its inner surface with a first siliconizing layer 5, which extends from the bulb neck to the largest bulb diameter and reflects the light increasingly toward the bulb cap 6.
  • the second, substantially thinner silicon layer 7, which adjoins the first layer 5 with an essentially sharp-edged transition and which covers the inner wall of the piston crown 6, produces the light-scattering effect.
  • the absorption ratio of the reflective first layer 5 applied on the base side to that of the second layer 7 applied on the piston crown 6 is approximately 6: 1.
  • both layers are applied in one operation in the electrostatic drying process, in which one during approx. 0.45 s air flow with approx.
  • Si02 powder particles are blown into the lamp bulb 1 and deposited in the electrostatic field on the inner wall of the glass bulb.
  • a high voltage of approximately 20 kV is present between the heated lamp bulb 1 and the coating nozzle 8.
  • the distribution of the layer densities and layer thicknesses is achieved by means of a cooling cap 9 and a circular, flat deflection plate 10.
  • the piston tip 6 is cooled for about 10 s with blown air 11 of about 2.7 bar.
  • the cooling cap 9 is placed on the lamp bulb 1, which extends down to the height of the largest bulb diameter and is sealed with a rubber ring 12.
  • the blown air 11 escapes through an opening 13 made in the cooling cap 9.
  • the deflection plate is arranged inside the lamp bulb 1 above and concentrically with the coating nozzle 8, likewise at about the height of the largest bulb diameter.
  • the lamp bulb 1, which was heated to about 450 K before the start of siliconizing, is kept at a temperature of about 300 K during the siliconizing in the area of the bulb top 6, while the rest of the bulb part has about 420 K.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Glass Compositions (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

1. Process for manufacturing an electrical incandescent lamp with a mushroom-shaped lamp bulb made of glass which, on its internal surface between the neck of the bulb and the maximum bulb diameter, is provided with an SiO2 layer which reflective to visible radiation and which reflects the radiation in an intensified manner to the bulb bowl, and the bulb bowl of which has an internal surface which diffuses visible radiation, a coating nozzle with a deflector shield attached to it being placed inside the lamp bulb to apply the SiO2 coating, and the fine SiO2 powder particles carried by a gas stream being blown into a heated lamp bowl and applied to the internal wall of the bulb in the electrostatic field, characterized in that the internal surface of the bulb bowl which diffuses visible radiation also consists of an SiO2 coating which is applied in one operating cycle with the coating which is reflective to visible radiation between the neck of the bulb and the maximum bulb diameter, the deflector shield being formed as a flat, circular disc which is positioned concentrically with the coating nozzle and at the level of the maximum bulb diameter, and the bulb bowl of the otherwise heated lamp bulb being cooled during the coating.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer elektrischen Glühlampe mit den im Oberbegriff des Hauptanspruchs bezeichneten Merkmalen.The invention relates to a method for producing an electric light bulb with the features specified in the preamble of the main claim.

Die lichtstreuende Oberfläche der Kolbenkuppe wird üblicherweise durch eine Flußsäuremattierung des Lampenkolbens hergestellt. Die Innensilizierung wird gegenwärtig im Naßverfahren vorgenommen. Vormattierte stehende Lampenkolben werden bis zum größten Kolbendurchmesser mit Si02- haltiger Paste beschlämmt, wobei die Kolbenkuppe unbeschlämmt bleibt.The light-scattering surface of the bulb top is usually produced by hydrofluoric acid matting of the lamp bulb. Internal siliciding is currently carried out using the wet process. Pre-matted standing lamp bulbs are slurried up to the largest bulb diameter with Si0 2 -containing paste, the bulb tip remaining unsludged.

Es ist bekannt, auch die lichtstreuende Oberfläche mit einer Innensilizierschicht zu erzeugen, die im Naßverfahren aufgetragen wird. Benutzt wird eine Beschlämmpaste bestimmter Viskosität (US-PS-3 909 649).It is known to also produce the light-scattering surface with an inner silicon layer, which is applied using the wet process. A slurry paste of certain viscosity is used (US Pat. No. 3,909,649).

Ferner ist die Innensilizierung von Lampenkolben im Trockenverfahren bekannt, bei der von einem Gasstrom getragene SiOz-Pulverteilchen in den Lampenkolben geblasen und im elektrostatischen Feld an das erwärmte Kolbenglas gebunden werden. Wenn sich die Silizierschicht nur auf bestimmte Teile der Kolbeninnenwand erstrecken soll, können in den die Pulverteilchen tragenden Gasstrom diesen ablenkende Mittel angeordnet werden. So ist zum Freihalten der rohrförmigen Kuppe eines bauchigen Lampenkolbens einer elektrischen Entladungslampe von Pulverteilchen im Bereich des größten Kolbendurchmessers ein kreisförmiger Ablenkschild gelagert, dessen der Beschichtungsdüse abgewandte Seite flach ist, während die der Düse zugewandte Seite eine konvexe Form aufweist. Der Ablenkschild liegt über der Beschichtungsdüse und ist zu dieser konzentrisch angeordnet. Der aus rostfreiem Stahl bestehende Schild ist mit Tragstäben abgestützt, die im Düsenbereich verankert sind (US-PS-3 279 937).Furthermore, the internal siliconization of lamp bulbs in the dry process is known, in which SiO z powder particles carried by a gas stream are blown into the lamp bulb and bound to the heated bulb glass in the electrostatic field. If the siliconizing layer is to extend only to certain parts of the inner wall of the piston, these deflecting means can be arranged in the gas stream carrying the powder particles. In order to keep the tubular tip of a bulbous lamp bulb of an electric discharge lamp of powder particles in the region of the largest bulb diameter, a circular deflection shield is mounted, the side of which facing away from the coating nozzle is flat, while the side facing the nozzle has a convex shape. The deflection shield lies above the coating nozzle and is arranged concentrically with it. The stainless steel shield is supported with support rods which are anchored in the nozzle area (US Pat. No. 3,279,937).

Aufgabe der Erfindung ist es, eine elektrische Glühlampe der eingangs beschriebenen Art einfacher in Aufbau und Herstellungsweise zu gestalten.The object of the invention is to make an electric incandescent lamp of the type described in the introduction simpler in construction and method of manufacture.

Die gestellte Aufgabe wird mit den im kennzeichnenden Teil des Anspruchs 1 aufgeführten Merkmalen gelöst. Der Übergang von einer zur anderen Schicht ist im wesentlichen scharfkantig. Ein Schichtdickenverhältnis von ca. 6 : 1 (reflektierende erste Schicht : lichtstreuender zweiter Schicht) hat sich als besonders vorteilhaft erwiesen. Die Schichten sind in einem Arbeitsgang im elektrostatischen Verfahren aufgetragen, wobei ein Hochspannungspotential zwischen dem Lampenkolben und der Beschichtungsdüse angelegt ist. Die gewünschten Unterschiede in Schichtdichte und Schichtdicke sind mittels eines kreisförmigen, flachen Ablenkschildes erreicht, das über und konzentrisch mit der Beschichtungsdüse im Bereich des größten Kolbendurchmessers angeordnet ist und den Pulverstrom aufteilt. Wesentlich für dieses Verfahren ist ferner, daß die Kolbenkuppe des erwärmten Kolbens während des Beschichtens gekühlt ist. Ein wesentlicher weiterer Vorteil dieses neuartigen Beschichtungsverfahrens ist, daß das Innenmattieren des Lampenkolbens mittels Flußsäure entfallen kann, wodurch die Umweltbelastung wesentlich verringert wird.The object is achieved with the features listed in the characterizing part of claim 1. The transition from one layer to the other is essentially sharp. A layer thickness ratio of approximately 6: 1 (reflective first layer: light-scattering second layer) has proven to be particularly advantageous. The layers are applied in one operation using the electrostatic method, a high voltage potential being applied between the lamp bulb and the coating nozzle. The desired differences in layer density and layer thickness are achieved by means of a circular, flat deflection shield which is arranged above and concentrically with the coating nozzle in the region of the largest piston diameter and divides the powder flow. It is also essential for this method that the piston top of the heated piston is cooled during the coating. A significant further advantage of this new type of coating process is that there is no need to matt the inside of the lamp bulb using hydrofluoric acid, which significantly reduces the environmental impact.

Nachfolgend ein Ausführungsbeispiel. Von den schematisch dargestellten Figuren zeigen

  • Figur 1 eine elektrische Glühlampe gemäß der Erfindung in teilweise aufgebrochener Ansicht
  • Figur 2 das Beschichten des Lampenkolbens
An exemplary embodiment follows. Show from the schematically represented figures
  • Figure 1 shows an electric light bulb according to the invention in a partially broken view
  • Figure 2 shows the coating of the lamp bulb

Die Lampe nach Figur 1 weist einen pilzförmigen Lampenkolben 1, einen Sockel 2 sowie einen in einem Gestell 3 gehalterten Leuchtkörper 4 auf. Der Lampenkolben 1 ist an seiner Innenoberfläche mit einer ersten Silizierschicht 5 versehen, die sich vom Kolbenhals bis zum größten Kolbendurchmesser erstreckt und das Licht verstärkt zur Kolbenkuppe 6 reflektiert. Die zweite, wesentlich dünnere Silizierschicht 7, die mit einem im wesentlichen scharfkantigen Übergang an die erste Schicht 5 anschließt und die die Innenwand der Kolbenkuppe 6 bedeckt, bewirkt den lichtstreuenden Effekt. Vorzugsweise beträgt das Absorptionsverhältnis der sockelseitig aufgetragenen reflektierenden ersten Schicht 5 zu der auf der Kolbenkuppe 6 aufgetragenen den zweiten Schicht 7 ca. 6 : 1. Wie aus Figur 2 ersichtlich, sind beide Schichten in einem Arbeitsgang im elektrostatischen Trockenverfahren aufgetragen, bei dem von einem während ca. 0,45 s währenden Luftstrom mit ca. 3,3 bar getragene Si02-Pulverteilchen in den Lampenkolben 1 geblasen und im elektrostatischen Feld auf der Innenwandung des Glaskolbens angelagert werden. Dabei liegt zwischen dem erwärmten Lampenkolben 1 und der Beschichtungsdüse 8 eine Hochspannung von ca. 20 kV an. Die Verteilung der Schichtdichten und Schichtdicken wird dabei mittels einer Kühlkappe 9 und eines kreisförmigen, flachen Ablenkschildes 10 erzielt. Die Kühlung der Kolbenkuppe 6 erfolgt während ca. 10 s mit Blasluft 11 von ca. 2,7 bar. Hierzu ist dem Lampenkolben 1 die Kühlkappe 9 aufgesetzt, die bis auf die Höhe des größten Kolbendurchmessers herabreicht und mit einem Gummiring 12 abgedichtet ist. Die Blasluft 11 entweicht durch eine in der Kühlkappe 9 angebrachte Öffnung 13. Der Ablenkschild ist innerhalb des Lampenkolbens 1 über und konzentrisch mit der Beschichtungsdüse 8 ebenfalls etwa in Höhe des größten Kolbendurchmessers angeordnet. Der vor Beginn des Silizierens auf etwa 450 K erwärmte _ Lampenkolben 1 wird während des Silizierens im Bereich der Kolbenkuppe 6 auf einer Temperatur von etwa 300 K gehalten, während der übrige Kolbenteil etwa 420 K besitzt.The lamp according to FIG. 1 has a mushroom-shaped lamp bulb 1, a base 2 and a luminous element 4 held in a frame 3. The lamp bulb 1 is provided on its inner surface with a first siliconizing layer 5, which extends from the bulb neck to the largest bulb diameter and reflects the light increasingly toward the bulb cap 6. The second, substantially thinner silicon layer 7, which adjoins the first layer 5 with an essentially sharp-edged transition and which covers the inner wall of the piston crown 6, produces the light-scattering effect. The absorption ratio of the reflective first layer 5 applied on the base side to that of the second layer 7 applied on the piston crown 6 is approximately 6: 1. As can be seen from FIG. 2, both layers are applied in one operation in the electrostatic drying process, in which one during approx. 0.45 s air flow with approx. 3.3 bar Si02 powder particles are blown into the lamp bulb 1 and deposited in the electrostatic field on the inner wall of the glass bulb. A high voltage of approximately 20 kV is present between the heated lamp bulb 1 and the coating nozzle 8. The distribution of the layer densities and layer thicknesses is achieved by means of a cooling cap 9 and a circular, flat deflection plate 10. The piston tip 6 is cooled for about 10 s with blown air 11 of about 2.7 bar. For this purpose, the cooling cap 9 is placed on the lamp bulb 1, which extends down to the height of the largest bulb diameter and is sealed with a rubber ring 12. The blown air 11 escapes through an opening 13 made in the cooling cap 9. The deflection plate is arranged inside the lamp bulb 1 above and concentrically with the coating nozzle 8, likewise at about the height of the largest bulb diameter. The lamp bulb 1, which was heated to about 450 K before the start of siliconizing, is kept at a temperature of about 300 K during the siliconizing in the area of the bulb top 6, while the rest of the bulb part has about 420 K.

Claims (3)

1. Process for manufacturing an electrical incandescent lamp with a mushroom-shaped lamp bulb made of glass which, on its internal surface between the neck of the bulb and the maximum bulb diameter, is provided with an Si02 layer which is reflective to visible radiation and which reflects the radiation in an intensified manner to the bulb bowl, and the bulb bowl of which has an internal surface which diffuses visible radiation, a coating nozzle with a deflector shield attached to it being placed inside the lamp bulb to apply the Si02 coating, and the fine Si02 powder particles carried by a gas stream being blown into a heated lamp bowl and applied to the internal wall of the bulb in the electrostatic field, characterized in that the internal surface of the bulb bowl which diffuses visible radiation also consists of an Si02 coating which is applied in one operating cycle with the coating which is reflective to visible radiation between the neck of the bulb and the maximum bulb diameter, the deflector shield being formed as a flat, circular disc which is positioned concentrically with the coating nozzle and at the level of the maximum bulb diameter, and the bulb bowl of the otherwise heated lamp bulb being cooled during the coating.
2. Process according to Claim 1, characterized in that a cooling cap provided with a sealing ring is placed on the bulb bowl to cool the bulb bowl, the sealing ring lying on the bulb bowl in the region of the maximum bulb diameter and an air blast flowing through the cooling cap, whereby the temperature of the lamp bulb previously heated to approximately 450 K is reduced to approximately 300 K in the region of the bulb bowl around which the air blast flows.
3. Process according to Claims 1 and 2, characterized in that the air blast flows through the cooling cap at a pressure of approximately 2.7 bar for approximately 10 s.
EP84113117A 1983-11-08 1984-10-31 Method for the manufacturing of an electric incandescent lamp Expired EP0141402B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84113117T ATE35482T1 (en) 1983-11-08 1984-10-31 PROCESS FOR MAKING AN ELECTRIC LIGHT BULB.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3340387 1983-11-08
DE19833340387 DE3340387A1 (en) 1983-11-08 1983-11-08 ELECTRIC BULB AND METHOD FOR THE PRODUCTION THEREOF

Publications (3)

Publication Number Publication Date
EP0141402A2 EP0141402A2 (en) 1985-05-15
EP0141402A3 EP0141402A3 (en) 1986-02-12
EP0141402B1 true EP0141402B1 (en) 1988-06-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113117A Expired EP0141402B1 (en) 1983-11-08 1984-10-31 Method for the manufacturing of an electric incandescent lamp

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EP (1) EP0141402B1 (en)
AT (1) ATE35482T1 (en)
DE (2) DE3340387A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3762562D1 (en) * 1986-03-11 1990-06-07 Philips Nv BLOWED LAMP PISTON AND ELECTRIC LAMP WITH SUCH A PISTON.
WO1991010256A1 (en) * 1989-12-22 1991-07-11 Gte Products Corporation Tungsten halogen aluminized reflector lamp and method of fabricating such lamp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1999014A (en) * 1931-01-21 1935-04-23 Hygrade Sylvania Corp Manufacture of incandescent electric lamps
US2449268A (en) * 1947-05-29 1948-09-14 Sylvania Electric Prod Electric lamp
US4081709A (en) * 1975-11-20 1978-03-28 General Electric Company Electrostatic coating of silica powders on incandescent bulbs
NL7905367A (en) * 1979-07-10 1981-01-13 Philips Nv ELECTRIC LAMP WITH A MIRRORED LAMP BARREL.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PHILIPS Compact lightning catalogues, S. 24-25, Ed. 4/81 *
PHILIPS Produktliste Licht/Batterien 1982/1983 *

Also Published As

Publication number Publication date
DE3472497D1 (en) 1988-08-04
EP0141402A3 (en) 1986-02-12
ATE35482T1 (en) 1988-07-15
DE3340387A1 (en) 1985-05-15
EP0141402A2 (en) 1985-05-15

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