EP1010191A1 - Phare de vehicule de couleur ambre - Google Patents

Phare de vehicule de couleur ambre

Info

Publication number
EP1010191A1
EP1010191A1 EP98931761A EP98931761A EP1010191A1 EP 1010191 A1 EP1010191 A1 EP 1010191A1 EP 98931761 A EP98931761 A EP 98931761A EP 98931761 A EP98931761 A EP 98931761A EP 1010191 A1 EP1010191 A1 EP 1010191A1
Authority
EP
European Patent Office
Prior art keywords
lamp
coated
amber
light bulb
yellow
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.)
Granted
Application number
EP98931761A
Other languages
German (de)
English (en)
Other versions
EP1010191B1 (fr
EP1010191A4 (fr
Inventor
Paul A. Young
Mitchell R. Gagnon
William H. Lynch
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 Sylvania Inc
Original Assignee
Osram Sylvania Inc
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 Osram Sylvania Inc filed Critical Osram Sylvania Inc
Publication of EP1010191A1 publication Critical patent/EP1010191A1/fr
Publication of EP1010191A4 publication Critical patent/EP1010191A4/fr
Application granted granted Critical
Publication of EP1010191B1 publication Critical patent/EP1010191B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 electric lamps and particularly to electric lamps used in vehicles. More particularly the invention is concerned with a polymer coating for a vehicle signal lamp.
  • Amber vehicle lamp bulbs are commonly used as signal lamps in motor vehicles. Historically amber bulbs were made with a cadmium doped glass to produce the amber color. For environmental reasons, cadmium has become an unacceptable material. There is now a market need for an environmentally sound alternative. Various color coated lamps have been developed, and their initial color can be acceptable. Given the specified expected ambient operating conditions for a vehicle, the bulb surface may have a temperature ranging from -40 to 350 degrees Celsius, so durability is difficult to achieve. In fact, the color, or the adherence of the existing coatings, or both have not been particularly good over time. Elapsed time for an automotive signal lamp can appear to be relatively long, while in fact the actual "on" time can be relatively short.
  • a signal lamp may be on for only minutes in the day of a vehicle's operation, so the apparent life of the lamp may appear to be a year or more, when in fact the lamp has only been on cumulatively for only a few tens or even several hundred hours or so.
  • known coatings have been found to peel, or turn into a dust that falls off the bulb. Similarly the color may fade. The lamp color then departs from the required specification. There is then a need for an amber bulb coating material that meets standard color specifications, and has a durable life.
  • a durable amber colored lamp may be formed from a lamp bulb having a coating formed from a silane, a clear silicone-polyester resin, a yellow iron o ide, and a yellow anthraquinone.
  • FIG. 1 shows a perspective view of a preferred embodiment of an amber vehicle lamp.
  • FIG. 2 shows a perspective view of a preferred alternative embodiment of an amber vehicle lamp.
  • FIG. 3 shows a perspective view of another preferred alternative embodiment of an amber vehicle lamp.
  • FIG. 4 shows a cross sectional view of a coated lamp envelope, partially broken away.
  • FIG. 5 shows a chart of the effects over time of fading on the color coordinates.
  • FIG. 1 shows a perspective view of a preferred embodiment of an amber vehicle lamp.
  • the amber vehicle lamp 10 is assembled from a lamp bulb with a coating 12 comprising a clear silicone-polyester resin, yellow iron oxide, and a yellow anthraquinone. A silane coupling agent may be optionally included in the polyester resin.
  • FIG. 2 shows a perspective view of a preferred alternative embodiment of an amber vehicle lamp.
  • FIG. 3 shows a perspective view of another preferred alternative embodiment of an amber vehicle lamp.
  • FIG. 4 shows a cross sectional view of a coated lamp envelope, partially broken away.
  • the amber coating 12 covers substantially all of the light transmitting region of the glass 14 of the bulb.
  • the preferred incandescent light bulb is an spherical bulb with a press seal known generally in the industry as an S-8.
  • the bulb has a diameter of about 1 inch, and is made of a SG10 type glass, but other glasses, inckiding unleaded glasses, may be used.
  • the filament is supplied with electricity through two leads sealed th ⁇ gh the press seal. Similar, two filament, four lead bulbs are also commonly made, and may be similarly coated.
  • a base is attached to the press seal region to provide a convenient mechanical coupling and electrical connection for the bulb. Several base designs are known. The particular choice of the base design is felt to be matter of design choice.
  • the amber color coating 12 Coated on the exterior of the bulb is an amber colored coating 12 that, apart from the amber color is substantially transparent.
  • the amber color coating includes a clear silicone-polyester polymer and colorant combination including yellow iron oxide, and yellow anthraquinone.
  • the preferred coating has a weight ratio composition of 5.0 percent yellow iron oxide, 5.0 percent yellow anthraquinone with the remainder being the silicone-polyester resin.
  • a silane coupling agent, of 0.5 weight percent silane may be included in the silicone-polyester.
  • the preferred clear resin is a high silicone content polymer, and in particular, high silicone silicone-polyester type polymer resin.
  • the Applicants use a high silicone content polymer available as Silikoftal HTT from Tego Chemie Service GmbH.
  • the preferred silane material includes silicone-polyester linkages.
  • the Applicants have used a known silane with polyester linkages comprising gamma- methacryloxypropyltrimethoxysilane available as Z-6030 from Dow Corning
  • the silane material may be applied separately, or mixed with the silicone-polyester resin.
  • One recent test procedure indicates that while the coating composition that includes the silane material can achieve an existing specification, the same composition without the silane results in greater durability.
  • the composition with the silane included is now considered a less preferred alternative.
  • a solvent is mixed with the colorants, silane (optional) and resin in sufficient quantity to form a fluid coating material with a viscosity convenient for the chosen form of application. Dipping the lamp is one convenient method of applying the coating. The Applicants prefer spraying, so the mixture needs to be diluted with the solvent sufficiently to result in a sprayable fluid.
  • the preferred polymer solvent is acetone but others may be used, such as methoxypropylacetate.
  • the preferred colorant material is a mixture of a yellow iron oxide and an anthraquinone.
  • the preferred anthraquinone is Filesier yellow RNB, available from Ciba Specialty Chemicals and has a more particular chemical formula of 9, 10- anthraceneedione, l , r- ⁇ (6-phenyl- l ,3,5-triazine-2,4diyl)diimino ⁇ bis-.
  • the colorants are prepared to provide particle sizes of O.Ol ⁇ m or less. The very small size particle size enables a transparent bulb, that still has an amber color.
  • the yellow iron oxide colorant may be dispersed in a media mill using solvent, and milled to the small size.
  • the anthraquinone may be dispersed separately, again using a media mill, and milled to the small size (particle sizes of O.Ol ⁇ m or less).
  • the two colorants are then combined in the mill, and then milled together.
  • the two colorants are then thoroughly mixed.
  • the silane (optional) and silicone- polyester resin are then added by using a planetary mixer. A solvent is added to achieve the desired viscosity for the chosen form of application.
  • the resulting mixture, immediately after mixing does not necessarily show the proper amber color. Nonetheless, the resulting mixture is ready for application to the clean glass lamp surface.
  • the chosen bulb is known as a 3157 S-8 wedge.
  • the bulbs are held by their bases so the bulb portions face down, and the bases and electrical connections are shielded from any spray. This leaves the light transmissive portion of the bulb exposed.
  • the exposed glass portions of the bulb are then sprayed, bulb side up, with the coating mixture at ambient temperature, leaving a thin fluid coating.
  • the exposed glass portions may be dipped (bulb down) in the coating material, and any excess coating material may drip off.
  • the viscosity is such that the coating material as applied leaves a uniform thin layer which may be approximately 0.0127 millimeters (5.0 10 "4 inches). Measured variations were about 0.0015 millimeters (5.9
  • the coated bulb is then baked at 250 to 300 degrees Celsius for 15 minutes in a dust free atmosphere to form an amber colored polymer layer. During the baking process a number of events occur.
  • the colored coating layer is bonded to the glass.
  • the yellow iron oxide changes from FeOOH to Fe 3 O 2 and which in combination with the yellow anthraquinone pigment gives the desired amber color.
  • the silicone-polyester polymer is cross linked around the colorant particles to e ⁇ rap them in a complex network of resin material. The baking also drives off any residual solvent.
  • the resulting coated bulbs were tested and found to have the following characteristics:
  • the bulb had a thin hard, transparent amber coating.
  • the amber color meets the SAE and ECE color coordinate requirements for vehicle amber signal lamps.
  • Coated bulbs (with silane) under test have been operated continuously for over 840 hours. This is 70 percent of the rated life of 1200 hours for a 3157 S-8 wedge bulb. Coated bulbs (with silane) have been found to have complete coating adherence and a color maintenance of 96 percent measured by spherical integration methods. Coated bulbs (with silane) are expected to have a color maintenance of 94.3 percent at 100 percent of rated bulb life.
  • FIG. 5 shows a chart of the effects over time of fading on the color coordinates.
  • the bulbs were exposed to normal operating environment of 90 flashes per second for 1315 hours.
  • the intial color coordinates were approximately, (0.579, 0.415), and after 1315 hours the color had shifted to approximately (0.573, 0.422).
  • Both the initial and the final coordinates were within the EC (region 16) and SAE (region 18) defined regions for amber.
  • the coated bulbs, with silane and without silane were tested according to a schedule of 24 hours of the lamp being on under varying conditions of heat, and humidity. In summary, during the test, the temperature was varied from -40 to 80 degrees Celsius, with the humidity reaching as much as 93 percent.
  • the coated lamps were turned on and off according to a schedule.
  • the coated lamps were to achieve a B10 (90 percent success, 10 percent failure) of 10 cycles (10 days).
  • the bulbs with silane passed with a B10 of about 10 or 12 cycles.
  • the bulbs without the silane achieved a B10 of 18 cycles.
  • the coated bulb has proven to have a better amber color, and a longer color maintenance than any other coated product known to the applicants.
  • the disclosed operating conditions, dimensions, configurations and embodiments are as examples only, and other suitable configurations and relations may be used to impleme ⁇ ,the invention.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Surface Treatment Of Glass (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un phare de véhicule de couleur ambre (10) comprenant une ampoule et un revêtement ambre (12), lequel renferme une résine transparente silicone-polyester, des colorants contenant de l'oxyde de fer jaune, et de l'anthraquinone jaune. Ce revêtement ambre peut également renfermer un agent de couplage silane. Le phare de véhicule ambre (10), qui produit une couleur ambre conforme aux spécifications ECE, présente une durabilité atteignant 96 pour cent de la couleur pour 70 pour cent de la durée de vie nominale de la lampe. La dimension des particules des colorants est en outre inférieure à 0,01 micromètre, ce qui permet d'obtenir une ampoule sensiblement transparente mais de couleur ambre.
EP98931761A 1998-07-01 1998-07-01 Phare de vehicule de couleur ambre Expired - Lifetime EP1010191B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/013693 WO2000002224A1 (fr) 1998-07-01 1998-07-01 Phare de vehicule de couleur ambre

Publications (3)

Publication Number Publication Date
EP1010191A1 true EP1010191A1 (fr) 2000-06-21
EP1010191A4 EP1010191A4 (fr) 2001-10-04
EP1010191B1 EP1010191B1 (fr) 2007-03-14

Family

ID=22267417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98931761A Expired - Lifetime EP1010191B1 (fr) 1998-07-01 1998-07-01 Phare de vehicule de couleur ambre

Country Status (6)

Country Link
EP (1) EP1010191B1 (fr)
JP (1) JP2002520771A (fr)
KR (1) KR100531045B1 (fr)
CA (1) CA2302363C (fr)
DE (1) DE69837338T2 (fr)
WO (1) WO2000002224A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3626062B2 (ja) * 2000-02-18 2005-03-02 市光工業株式会社 着色コーティング剤および着色電球
DE102012111836A1 (de) * 2012-12-05 2014-06-05 Schott Ag Beschichtungsmaterial und Substrat mit einer semitransparenten Beschichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014749A (ja) * 1983-07-05 1985-01-25 松下電子工業株式会社 カラ−デイスプレイ用電球
JPH083996B2 (ja) * 1987-06-26 1996-01-17 松下電子工業株式会社 表示素子用蛍光ランプ
US5126620A (en) * 1988-12-19 1992-06-30 Mitsubishi Denki Kabushiki Kaisha Display element
DE69124410T2 (de) * 1990-04-18 1997-07-10 Matsushita Electric Ind Co Ltd Kompositschicht, Glaskompositmaterial und Verfahren zu seiner Herstellung
JP3516543B2 (ja) * 1995-10-27 2004-04-05 株式会社小糸製作所 ターンシグナルランプ用着色コーチング剤およびターンシグナルランプ

Also Published As

Publication number Publication date
WO2000002224A1 (fr) 2000-01-13
EP1010191B1 (fr) 2007-03-14
CA2302363C (fr) 2006-09-05
KR100531045B1 (ko) 2005-11-28
DE69837338T2 (de) 2007-11-29
EP1010191A4 (fr) 2001-10-04
DE69837338D1 (de) 2007-04-26
JP2002520771A (ja) 2002-07-09
KR20010023532A (ko) 2001-03-26
CA2302363A1 (fr) 2000-01-13

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