US3784861A - Lamp with opaque screen - Google Patents

Lamp with opaque screen Download PDF

Info

Publication number
US3784861A
US3784861A US00119021A US3784861DA US3784861A US 3784861 A US3784861 A US 3784861A US 00119021 A US00119021 A US 00119021A US 3784861D A US3784861D A US 3784861DA US 3784861 A US3784861 A US 3784861A
Authority
US
United States
Prior art keywords
lamp
envelope
coating
filament
silicon
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
US00119021A
Inventor
V Notelteirs
J Goorissen
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3784861A publication Critical patent/US3784861A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/26—Screens; Filters
    • 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 of manufacturing a halogen incandescent lamp having a quartz envelope in which a part of the radiated light is screened.
  • a halogen incandescent lamp is to be understood to mean in this connection an incandescent lamp having an envelope of comparatively small dimensions in which a filament is arranged in an atmosphere which contains a halogen. Such a lamp remains bright throughout its life.
  • a method of manufacturing a halogen incandescent lamp having a quartz envelope in which a part of the radiated light is screened is characterized in that a black layer which does not pass visible light is provided on the part of the envelope destined for that purpose by' coating said part with an ethyl silicate paint which contains silicon as a black pigment, removing the solvent and subjecting the layer on the envelope to a thermal treatment.
  • the layers obtained by the method according to the invention are deep black and poorly reflecting.
  • the ethyl silicate paint used in the method according to the invention may be obtained, for example, as follows:
  • Powdered silicon (purity better than 98 percent) is ground to a grain size of maximally 50 microns by grinding in a ball mill.
  • the silicon powder is then ground for 3 X 24 hours in a ball mill with an equal quantity by weight of anhydrous kaolin in methanol.
  • the resulting silicon-kaolin mixture is evaporated to dryness and then dried at 140C for 15 hours.
  • 3 kgms of the silicon-kaolin mixture are dispersed in 5,800 mls of a hydrolized ethyl silicate solution to which 415 gms of boric acid, 480 mls of monobutyl glycol ether, and 250 mls of glycerol are added by grinding the mixture in a ball mill for 3 hours.
  • the hydrolized ethyl silicate solution was obtained by mixing ethyl silicate with water and methanol in a ratio of 180: 34 123 parts by volume.
  • this paint After providing a layer of this paint, which may be done by spraying, it is dried, and then subjected to a thermal treatment by heating the envelope with the layer in a hot air furnace or operating the lamp. Suitable temperatures lie between 250 and 500C The ethyl silicate is converted at this temperature into silicon dioxide.
  • FIG. 1 is a diagrammatic side elevation of a spotlight lamp.
  • FIG. 2 is a diagrammatic side elevation of a automobile headlight employing two filaments.
  • FIG. 1 shows a 6 volt-35 watt halogen incandescent lamp (gas filling 5 atm. Kr 0.1 percent by vol. of Ch Br for mounting in a parabolic reflector.
  • a black layer 2 is provided according to the method of the invention, while using an ethyl silicate paint with silicons as a black pigment as described above.
  • the envelope 1 of the lamp was covered with adhesive tape at those places where no black layer was to be provided.
  • the free part of the wall of the envelope was coated by spraying with the black ethyl silicate paint.
  • After drying the layer of paint the adhesive tape was removed and the lamp heated at 400C in a hot air furnace for 10 minutes.
  • the layer. remained deep black throughout the life of the lamp (at least 2,000 hours).
  • the lamp was operated in air; the temperature of the wall of the envelope during operation increased to 500 to 600C.
  • FIG. 2 shows a automobile headlight provided with two filaments 3 and 4, for a non-blinding, low beam and for a bright or passingbeam, respectively
  • the lamp is mounted in a parabolic reflector in such manner, that the bright beam filament is in the focus thereof.
  • a black layer was provided at 5 and 6.
  • the lamp shown is a 12 volt 2 X 55 watt lamp having a life of at least 250 hours.
  • the lamp contains 5 atm. krypton and 0.1 percent by vol. Ch Br At the end of the life, the black layer was found to be still in good shape.
  • the lamp was operated in air, temperature of the wall of the envelope between 500 and 600C.
  • the method according to the invention provides the following advantages.
  • a corrosion-resistant screening is obtained which readily adheres to quartz and is resistant to scratches. 3. A sharply marked screening can be obtained. 4. The screening layer is resistant to temperature (600 to 1,000C).
  • a halogen incandescent lamp including a quartz envelope housing at least one filament, the improvement in combination therewith comprising an opaque coating on a portion of the envelope for providing a screen to block some of the visible light radiated from each filament, said coating comprising a black mixture of silicon and silicon dioxide.
  • a lamp according to claim 1 wherein the envelope is a closed tubular member with an upper end part adjacent the filament, and said coating surrounds said upper end part.
  • a lamp according to claim 4 wherein the lamp has a second filament within the envelope axially spaced from the first, and a second coating axially spaced from the first and forming a band around the envelope.

Abstract

A halogen incandescent lamp having on a portion of the bulb a black opaque coating of silicon and silicon dioxide.

Description

United States Patent 1191 Notelteirs et al.
LAMP WITH OPAQUE SCREEN Inventors: Victor Rosallie'Notelteirs; Jan
- Goorissen, both of Emmasingel,
Eindhoven, Netherlands U.S. Philips Corporation, New York, N.Y.
Filed: Feb. 25, 1971 Appl. No.: 119,021
Related US. Application Data Division of Ser. No. 805,309, March 7, 1969, abandoned.
Assignee:
us. 0 313/117, 117/97, 313/221 1m. 01. 11o1 5/08, 1101 j 61/40, HOlk 1/26 Field of Search 313/112, 116, 117,
Jan. 8, 1974 References Cited UNITED STATES PATENTS Primary Examiner-Alfred L. Brody Attorney-J. David Dainow ABSTRACT A halogen incandescent lamp having on a portion of the bulb a black opaque coating of silicon and silicon dioxide.
5 Claims, 2 Drawing Figures 1 LAMP WITH OPAQUE SCREEN CROSS REFERENCE This is a division of Applicantsfco-pending application Ser. No. 805,309, filed Mar. 7, 1969, now abancloned.
The invention relates to a method of manufacturing a halogen incandescent lamp having a quartz envelope in which a part of the radiated light is screened. A halogen incandescent lamp is to be understood to mean in this connection an incandescent lamp having an envelope of comparatively small dimensions in which a filament is arranged in an atmosphere which contains a halogen. Such a lamp remains bright throughout its life.
In some type of motorcar lamps it is conventional to intercept a part of the radiated light by means of metal screening caps which are arranged in the envelope. Such a method cannot readily be, used in halogen incandescent lamps, since the screening caps are attacked by halogen unless they are manufactured from a noble metal.
It is the object of the invention to overcome this difficulty. According to the invention, a method of manufacturing a halogen incandescent lamp having a quartz envelope in which a part of the radiated light is screened, is characterized in that a black layer which does not pass visible light is provided on the part of the envelope destined for that purpose by' coating said part with an ethyl silicate paint which contains silicon as a black pigment, removing the solvent and subjecting the layer on the envelope to a thermal treatment. The layers obtained by the method according to the invention are deep black and poorly reflecting.
The ethyl silicate paint used in the method according to the invention may be obtained, for example, as follows:
Powdered silicon (purity better than 98 percent) is ground to a grain size of maximally 50 microns by grinding in a ball mill. The silicon powder is then ground for 3 X 24 hours in a ball mill with an equal quantity by weight of anhydrous kaolin in methanol. The resulting silicon-kaolin mixture is evaporated to dryness and then dried at 140C for 15 hours. 3 kgms of the silicon-kaolin mixture are dispersed in 5,800 mls of a hydrolized ethyl silicate solution to which 415 gms of boric acid, 480 mls of monobutyl glycol ether, and 250 mls of glycerol are added by grinding the mixture in a ball mill for 3 hours. The hydrolized ethyl silicate solution was obtained by mixing ethyl silicate with water and methanol in a ratio of 180: 34 123 parts by volume.
After providing a layer of this paint, which may be done by spraying, it is dried, and then subjected to a thermal treatment by heating the envelope with the layer in a hot air furnace or operating the lamp. Suitable temperatures lie between 250 and 500C The ethyl silicate is converted at this temperature into silicon dioxide.
In order that the invention may be readily carried into effect, two examples thereof will now be described in greater detail by way of example, with reference to the accompanying drawing, in which FIG. 1 is a diagrammatic side elevation of a spotlight lamp.
FIG. 2 is a diagrammatic side elevation of a automobile headlight employing two filaments.
FIG. 1 shows a 6 volt-35 watt halogen incandescent lamp (gas filling 5 atm. Kr 0.1 percent by vol. of Ch Br for mounting in a parabolic reflector. On the outside of the wall 1 of the envelope, a black layer 2 is provided according to the method of the invention, while using an ethyl silicate paint with silicons as a black pigment as described above. For that purpose the envelope 1 of the lamp was covered with adhesive tape at those places where no black layer was to be provided. The free part of the wall of the envelope was coated by spraying with the black ethyl silicate paint. After drying the layer of paint the adhesive tape was removed and the lamp heated at 400C in a hot air furnace for 10 minutes. The layer. remained deep black throughout the life of the lamp (at least 2,000 hours). The lamp was operated in air; the temperature of the wall of the envelope during operation increased to 500 to 600C.
FIG. 2 shows a automobile headlight provided with two filaments 3 and 4, for a non-blinding, low beam and for a bright or passingbeam, respectively The lamp is mounted in a parabolic reflector in such manner, that the bright beam filament is in the focus thereof. In the manner as described for the lamp shown in FIG. 1, a black layer was provided at 5 and 6.
The lamp shown is a 12 volt 2 X 55 watt lamp having a life of at least 250 hours. The lamp contains 5 atm. krypton and 0.1 percent by vol. Ch Br At the end of the life, the black layer was found to be still in good shape. The lamp was operated in air, temperature of the wall of the envelope between 500 and 600C.
The method according to the invention provides the following advantages.
l. Providing the screening presents few structural difficulties. 2. A corrosion-resistant screening is obtained which readily adheres to quartz and is resistant to scratches. 3. A sharply marked screening can be obtained. 4. The screening layer is resistant to temperature (600 to 1,000C).
What is claimed is:
1. In a halogen incandescent lamp including a quartz envelope housing at least one filament, the improvement in combination therewith comprising an opaque coating on a portion of the envelope for providing a screen to block some of the visible light radiated from each filament, said coating comprising a black mixture of silicon and silicon dioxide.
2. A lamp according to claim .4 wherein the coating includes kaolin.
3. A lamp according to claim 1 wherein the envelope has interior and exterior surfaces,.and the coating is on the exterior surface.
4. A lamp according to claim 1 wherein the envelope is a closed tubular member with an upper end part adjacent the filament, and said coating surrounds said upper end part. 1
5. A lamp according to claim 4 wherein the lamp has a second filament within the envelope axially spaced from the first, and a second coating axially spaced from the first and forming a band around the envelope.
Egg v UNITED STATES PATENT OFFHJE I CERTIFICATE OF CORECWON wn: 3,784,861. Dated January 8, 1974 Inventofls) VICTOR ROSALLIE NO'I'EL'I'EIRS JAN GOORISSEN It is certified that error appearo in the above-identified patent and that: said Letters Patent are hereby corrected as shown below:
Claim 2, line '1, "4" should be 1 Signed and sealed this 5th day of November 1974.
(SEAL) Attest MCCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents

Claims (4)

  1. 2. A lamp according to claim 4 wherein the coating includes kaolin.
  2. 3. A lamp according to claim 1 wherein the envelope has interior and exterior surfaces, and the coating is on the exterior surface.
  3. 4. A lamp according to claim 1 wherein the envelope is a closed tubular member with an upper end part adjacent the filament, and said coating surrounds said upper end part.
  4. 5. A lamp according to claim 4 wherein the lamp has a second filament within the envelope axially spaced from the first, and a second coating axially spaced from the first and forming a band around the envelope.
US00119021A 1971-02-25 1971-02-25 Lamp with opaque screen Expired - Lifetime US3784861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11902171A 1971-02-25 1971-02-25

Publications (1)

Publication Number Publication Date
US3784861A true US3784861A (en) 1974-01-08

Family

ID=22382162

Family Applications (1)

Application Number Title Priority Date Filing Date
US00119021A Expired - Lifetime US3784861A (en) 1971-02-25 1971-02-25 Lamp with opaque screen

Country Status (1)

Country Link
US (1) US3784861A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837280A1 (en) * 1978-08-25 1980-03-06 Patra Patent Treuhand ELECTRIC LAMP WITH LIGHT COVERING COVER
DE2945242A1 (en) * 1978-11-13 1980-05-22 Gte Sylvania Inc TUNGSTEN HALOGEN CAPSULE AND HEADLAMP FITTED WITH IT
FR2470442A1 (en) * 1979-11-23 1981-05-29 Gte Prod Corp OPAQUE COATING FOR INCANDESCENT LAMPS
US4305015A (en) * 1978-12-08 1981-12-08 Tokyo Shibaura Denki Kabushiki Kaisha Sealed beam lamp including halogen bulb with light shielding layer
US4391847A (en) * 1981-10-19 1983-07-05 Edison International, Inc. Coating for halogen lamps
US4553066A (en) * 1983-08-08 1985-11-12 Gte Products Corporation Multiple filament lamp having wire grid to provide filament redundancy
EP0237647A1 (en) * 1986-01-20 1987-09-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Motor vehicle discharge lamp
US4728847A (en) * 1985-05-17 1988-03-01 U.S. Philips Corporation Electric lamp having an envelope with an intermediate zirconium oxide coated layer
US4740875A (en) * 1987-05-07 1988-04-26 Gte Products Corporation Motor vehicle headlight having lens with glare prevention means
EP0342721A1 (en) * 1988-04-15 1989-11-23 North American Philips Corporation Electric discharge lamp with reduced internal photoelectron production
US6270237B1 (en) * 1998-03-26 2001-08-07 U.S. Philips Corporation Electric lamp with an anti-reflecting layer
DE10045544A1 (en) * 2000-09-07 2002-03-28 Siemens Ag Process for applying a coating to a lamp and coated lamp
DE10045785A1 (en) * 2000-09-07 2002-04-25 Siemens Ag Process for coating a component and coated component
US20050184632A1 (en) * 2004-02-24 2005-08-25 Osram Sylvania Inc. Reflector lamp having reduced seal temperature
US20080106176A1 (en) * 2004-04-06 2008-05-08 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Reflector Lamp With Halogen Filling
US11057963B2 (en) 2017-10-06 2021-07-06 Applied Materials, Inc. Lamp infrared radiation profile control by lamp filament design and positioning

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1830165A (en) * 1927-12-10 1931-11-03 Westinghouse Lamp Co Coated lamp bulb
US1935723A (en) * 1930-10-09 1933-11-21 Gen Electric Vacuum tube
US2165987A (en) * 1937-07-15 1939-07-11 Gen Electric Electric lamp
US2486811A (en) * 1941-01-27 1949-11-01 Monsanto Chemicals Ceramic bodies
US2781654A (en) * 1953-10-01 1957-02-19 Gen Electric Coated lamp
US2795722A (en) * 1954-12-29 1957-06-11 Gen Electric Electric incandescent lamp
US2918595A (en) * 1957-04-29 1959-12-22 Gen Electric Coating composition for electric lamps
US3320460A (en) * 1964-01-02 1967-05-16 Sylvania Electric Prod Electric lamp coating comprising agglomerates of silica coated with a pigment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1830165A (en) * 1927-12-10 1931-11-03 Westinghouse Lamp Co Coated lamp bulb
US1935723A (en) * 1930-10-09 1933-11-21 Gen Electric Vacuum tube
US2165987A (en) * 1937-07-15 1939-07-11 Gen Electric Electric lamp
US2486811A (en) * 1941-01-27 1949-11-01 Monsanto Chemicals Ceramic bodies
US2781654A (en) * 1953-10-01 1957-02-19 Gen Electric Coated lamp
US2795722A (en) * 1954-12-29 1957-06-11 Gen Electric Electric incandescent lamp
US2918595A (en) * 1957-04-29 1959-12-22 Gen Electric Coating composition for electric lamps
US3320460A (en) * 1964-01-02 1967-05-16 Sylvania Electric Prod Electric lamp coating comprising agglomerates of silica coated with a pigment

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434481A1 (en) * 1978-08-25 1980-03-21 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh ELECTRIC LAMP WITH SCREEN COATING
US4305016A (en) * 1978-08-25 1981-12-08 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Electric lamp with opaque cap, particularly halogen cycle, dual filament, automotive-type lamp
DE2837280A1 (en) * 1978-08-25 1980-03-06 Patra Patent Treuhand ELECTRIC LAMP WITH LIGHT COVERING COVER
DE2945242A1 (en) * 1978-11-13 1980-05-22 Gte Sylvania Inc TUNGSTEN HALOGEN CAPSULE AND HEADLAMP FITTED WITH IT
US4305015A (en) * 1978-12-08 1981-12-08 Tokyo Shibaura Denki Kabushiki Kaisha Sealed beam lamp including halogen bulb with light shielding layer
FR2470442A1 (en) * 1979-11-23 1981-05-29 Gte Prod Corp OPAQUE COATING FOR INCANDESCENT LAMPS
US4288713A (en) * 1979-11-23 1981-09-08 Gte Products Corporation Lamp having opaque coating
US4391847A (en) * 1981-10-19 1983-07-05 Edison International, Inc. Coating for halogen lamps
US4553066A (en) * 1983-08-08 1985-11-12 Gte Products Corporation Multiple filament lamp having wire grid to provide filament redundancy
US4728847A (en) * 1985-05-17 1988-03-01 U.S. Philips Corporation Electric lamp having an envelope with an intermediate zirconium oxide coated layer
US4794297A (en) * 1986-01-20 1988-12-27 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Shielded discharge-type automotive head lamp
EP0237647A1 (en) * 1986-01-20 1987-09-23 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Motor vehicle discharge lamp
US4740875A (en) * 1987-05-07 1988-04-26 Gte Products Corporation Motor vehicle headlight having lens with glare prevention means
EP0342721A1 (en) * 1988-04-15 1989-11-23 North American Philips Corporation Electric discharge lamp with reduced internal photoelectron production
US6270237B1 (en) * 1998-03-26 2001-08-07 U.S. Philips Corporation Electric lamp with an anti-reflecting layer
DE10045544C2 (en) * 2000-09-07 2002-09-12 Siemens Ag Process for applying a coating to a lamp
DE10045785A1 (en) * 2000-09-07 2002-04-25 Siemens Ag Process for coating a component and coated component
DE10045544A1 (en) * 2000-09-07 2002-03-28 Siemens Ag Process for applying a coating to a lamp and coated lamp
DE10045785C2 (en) * 2000-09-07 2002-10-24 Siemens Ag Process for coating a component
US20040032210A1 (en) * 2000-09-07 2004-02-19 Bernd Karras Method for applying a coating to a lamp and coated lamp
US6887354B2 (en) 2000-09-07 2005-05-03 Siemens Aktiengesellschaft Method for applying a coating to a lamp and coated lamp
US20050184632A1 (en) * 2004-02-24 2005-08-25 Osram Sylvania Inc. Reflector lamp having reduced seal temperature
US7030543B2 (en) 2004-02-24 2006-04-18 Osram Sylvania Inc. Reflector lamp having reduced seal temperature
US20080106176A1 (en) * 2004-04-06 2008-05-08 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Reflector Lamp With Halogen Filling
US11057963B2 (en) 2017-10-06 2021-07-06 Applied Materials, Inc. Lamp infrared radiation profile control by lamp filament design and positioning

Similar Documents

Publication Publication Date Title
US3784861A (en) Lamp with opaque screen
EP0702396B1 (en) High efficiency vehicle headlights and reflector lamps
US4238704A (en) Sealed beam lamp of borosilicate glass with a sealing glass of zinc silicoborate and a mill addition of cordierite
GB909621A (en) Aperture fluorescent lamp
US4287231A (en) Method of spray-reflectorizing electric lamp envelopes
US4058639A (en) Method of making fluorescent lamp
US4305016A (en) Electric lamp with opaque cap, particularly halogen cycle, dual filament, automotive-type lamp
US2317035A (en) Electric lamp
US3322992A (en) Resin encapsulated lamp assembly
US4328022A (en) Composite article and method of sealing
US3932780A (en) Electric lamp having an envelope with a specular light-reflective coating of oriented aluminum particles
US3320460A (en) Electric lamp coating comprising agglomerates of silica coated with a pigment
US4088802A (en) Process for coating envelope for reflector-type fluorescent lamp and the lamp resulting therefrom
US3691421A (en) Doubled layer heater coating for electron discharge device
US2799791A (en) Electric incandescent lamp comprising a reflector
US5336969A (en) Highly thermally loaded electric lamp with reduced UV light emission, and method of its manufacture
US2665220A (en) Method of manufacturing luminescent screens
US2918595A (en) Coating composition for electric lamps
US1830165A (en) Coated lamp bulb
US2733166A (en) Method of internally coating lamp
US3160776A (en) Electric incandescent projection lamp
US3875454A (en) Low-pressure mercury vapour discharge lamp and method of manufacturing said lamp
US3044902A (en) Method of forming films of electro-luminescent phosphor
US2707687A (en) Method of forming luminescent coating
US2785327A (en) Electric discharge lamp with phosphorcoated rhodium reflector