CA2318850A1 - Electric lamp for a vehicle headlight - Google Patents
Electric lamp for a vehicle headlight Download PDFInfo
- Publication number
- CA2318850A1 CA2318850A1 CA002318850A CA2318850A CA2318850A1 CA 2318850 A1 CA2318850 A1 CA 2318850A1 CA 002318850 A CA002318850 A CA 002318850A CA 2318850 A CA2318850 A CA 2318850A CA 2318850 A1 CA2318850 A1 CA 2318850A1
- Authority
- CA
- Canada
- Prior art keywords
- lamp
- plastic
- lamp bulb
- bulb
- reflecting coating
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/19—Attachment of light sources or lamp holders
- F21S41/192—Details of lamp holders, terminals or connectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
- H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
The invention relates to lamp for a headlight of a vehicle comprising a metal-plastic socket. The lamp socket comprises a metallic holder (14a-14e) for the lamp bulb (10) and a plastic socket part (15) which is provided with the electrical contacts (16, 17) of the lamp. The metallic holder (14a-14e) is anchored in said plastic socket part (15). A sealing ring (19) formed of silicone or rubber is used for sealing the reflector opening which is configured as the lamp socket. The sealing ring (19) is arranged between the outer wall of the reflector (20) and the ring-shaped flange (15a) of the plastic socket part (15). According to the invention, the upper surface of the ring-shaped flange facing the lamp bulb (10) is provided with a light-reflecting coating.
Description
Electric lamp for a vehicle headlight The invention relates to an electric lamp for a vehicle headlight in accordance with the preamble of Patent Claim 1.
I. Prior Art Such an electric lamp is disclosed, for example, in the International Patent Application WO 97/25733. This laid-open patent application describes an electric incandescent lamp, in particular a motor vehicle headlight, having an incandescent filament enclosed in a vitreous lamp bulb, and a lamp cap comprising metal parts and plastic parts. The pinch foot, sealed in a gastight fashion, of the lamp bulb is fixed in a metallic holder part which, for its part, is connected directly or via an intermediate ring to a metallic, annular support sleeve. The metallic support sleeve is anchored in the plastic cap part of the lamp cap, which is fitted with the electric terminals of the lamp. In order to mount the lamp in the opening, constructed as lamp mount, of a reflector, the annular support sleeve has three reference noses, which are arranged in one plane are distributed equidistantly over the circumference of the support sleeve, and engage in the lamp mounting opening of the reflector, and a press-on spring which acts radially outwards and bears resiliently against the edge of the lamp mounting opening of the reflector. The sealing of the mounting opening of the reflector is performed by means of a silicone ring or rubber ring which is arranged between the reflector outer wall and the annular flange of the plastic cap part. The disadvantage of this lamp consists in that the plastic surface of the flange is accessible for the electromagnetic radiation emitted by the incandescent filament through the mounting opening of the reflector. This plastic surface is heated by the infrared radiation emitted by the incandescent filament and, in addition, by the absorption of the light produced by the incandescent filament, and tends to vaporize. Moreover, the aforementioned light absorption reduces the efficiency of the headlight.
II. Summary of the Invention It is the obj ect of the invention to provide a vehicle headlight lamp which when used in a headlight ensures a reduced vaporization behaviour and an improved efficiency.
The object is achieved according to the invention by means of the characterizing features of Patent Claim 1.
Particularly advantageous designs of the invention are described in the subclaims.
The vehicle headlight lamp according to the invention has a lamp cap, a transparent lamp bulb and at least one luminous means surrounded by the lamp bulb, the lamp cap having a plastic cap part, provided with the electric terminals of the lamp, and at least one metallic holder part, anchored in the plastic cap part, for the lamp bulb. According to the invention, the surfaces of the plastic cap part which face the lamp bulb are provided with an optically reflecting coating.
The optically reflecting coating reduces the light absorption of the plastic cap part, and thereby reduces the thermal loading of the latter- and consequently improves the vaporization behaviour of the plastic cap part. In addition, the optically reflecting coating increases the efficiency of the headlight, since the light impinging on the plastic surfaces is now rendered useful for the headlight reflector by the optically reflecting coating thereof.
I. Prior Art Such an electric lamp is disclosed, for example, in the International Patent Application WO 97/25733. This laid-open patent application describes an electric incandescent lamp, in particular a motor vehicle headlight, having an incandescent filament enclosed in a vitreous lamp bulb, and a lamp cap comprising metal parts and plastic parts. The pinch foot, sealed in a gastight fashion, of the lamp bulb is fixed in a metallic holder part which, for its part, is connected directly or via an intermediate ring to a metallic, annular support sleeve. The metallic support sleeve is anchored in the plastic cap part of the lamp cap, which is fitted with the electric terminals of the lamp. In order to mount the lamp in the opening, constructed as lamp mount, of a reflector, the annular support sleeve has three reference noses, which are arranged in one plane are distributed equidistantly over the circumference of the support sleeve, and engage in the lamp mounting opening of the reflector, and a press-on spring which acts radially outwards and bears resiliently against the edge of the lamp mounting opening of the reflector. The sealing of the mounting opening of the reflector is performed by means of a silicone ring or rubber ring which is arranged between the reflector outer wall and the annular flange of the plastic cap part. The disadvantage of this lamp consists in that the plastic surface of the flange is accessible for the electromagnetic radiation emitted by the incandescent filament through the mounting opening of the reflector. This plastic surface is heated by the infrared radiation emitted by the incandescent filament and, in addition, by the absorption of the light produced by the incandescent filament, and tends to vaporize. Moreover, the aforementioned light absorption reduces the efficiency of the headlight.
II. Summary of the Invention It is the obj ect of the invention to provide a vehicle headlight lamp which when used in a headlight ensures a reduced vaporization behaviour and an improved efficiency.
The object is achieved according to the invention by means of the characterizing features of Patent Claim 1.
Particularly advantageous designs of the invention are described in the subclaims.
The vehicle headlight lamp according to the invention has a lamp cap, a transparent lamp bulb and at least one luminous means surrounded by the lamp bulb, the lamp cap having a plastic cap part, provided with the electric terminals of the lamp, and at least one metallic holder part, anchored in the plastic cap part, for the lamp bulb. According to the invention, the surfaces of the plastic cap part which face the lamp bulb are provided with an optically reflecting coating.
The optically reflecting coating reduces the light absorption of the plastic cap part, and thereby reduces the thermal loading of the latter- and consequently improves the vaporization behaviour of the plastic cap part. In addition, the optically reflecting coating increases the efficiency of the headlight, since the light impinging on the plastic surfaces is now rendered useful for the headlight reflector by the optically reflecting coating thereof.
The optically reflecting coating is advantageously designed as an aluminium layer, because the latter has a degree of optical reflection as high as the headlight reflector, and adheres satisfactorily to the plastic cap part. For reasons of production engineering, the aluminium layer is advantageously designed as an aluminium-containing paint layer. Alternatively, the aluminium layer can advantageously also consist of an aluminium sheet which covers the plastic surfaces of the lamp cap which face the lamp bulb, and whose side facing the lamp bulb is polished.
III. Description of the preferred embodiment The invention is explained in more detail below with the aid of a preferred exemplary embodiment. In the drawing:
Figure 1 shows a diagrammatic, partially sectioned illustration of the preferred exemplary embodiment of the lamp according to the invention, and Figure 2 shows a top view of the plastic cap part, and the support sleeve of the lamp illustrated in Figure 1.
The preferred exemplary embodiment of the invention is a single-filament halogen lamp which is provided for use in a motor vehicle headlight. This lamp has a vitreous, essentially cylindrical lamp bulb 10 with a pinch foot l0a sealed in a gastight. fashion. The dome lOb of the lamp bulb 10 is provided with an optically absorbing coating. Serving as light source is an incandescent filament 11, which is aligned parallel to the lamp bulb axis and is connected in an electrically conducting fashion to two supply leads 12,13 which are guided out of the pinch foot 10a and consist of molybdenum wire. The pinch foot 10a of the lamp bulb 10 is fixed in a metallic holder, which comprises the cup-shaped holder part 14a, the intermediate ring 14e and the annular support sleeve 14b. In addition to the metallic holder 14a, 14b, the lamp cap also has a plastic cap part 15, which is provided with electric terminals 16, 17 of the lamp and in which the annular metallic support sleeve 14d is anchored. The support sleeve 14b has three reference noses 14c, lying in a plane and a press-on spring 14d for mounting the lamp in the reflector 20 of a motor vehicle headlight. The sealing of the reflector 20 is performed by means of a silicone sealing ring 19 which bears against the outer wall 20b of the reflector 20 and against the annular flange 15a of the plastic cap part 15. The design of the lamp in accordance with the preferred exemplary embodiment, and its use in a headlight are illustrated diagrammatically in Figure 1. The top side of the annular flange 15a, which faces the lamp bulb 10, is printed with an optically reflecting, aluminium-containing, paint layer 21 (Figure 2j which essentially has the same degree of optical reflection and the same hue as the reflector 20.
The invention is not restricted to the exemplary embodiment explained in more detail above. For example, instead of the application of a paint layer, it is also possible to carry out vapour deposition of an aluminium layer on the topside of the annular flange 15a. A
further alternative to the paint layer is to cover the topside of the annular flange 15a with an aluminium sheet whose surface facing the lamp bulb is polished.
Instead of an aluminium layer, it is also possible for the topside of the annular flange 15a to be provided with a different metallic coating, if the latter has a similarly high degree of reflection as the reflective surface of the headlight reflector. For example, the reflecting coating 21 can also comprise a steel sheet which covers the topside of the annular flange 15a which faces the lamp bulb.
III. Description of the preferred embodiment The invention is explained in more detail below with the aid of a preferred exemplary embodiment. In the drawing:
Figure 1 shows a diagrammatic, partially sectioned illustration of the preferred exemplary embodiment of the lamp according to the invention, and Figure 2 shows a top view of the plastic cap part, and the support sleeve of the lamp illustrated in Figure 1.
The preferred exemplary embodiment of the invention is a single-filament halogen lamp which is provided for use in a motor vehicle headlight. This lamp has a vitreous, essentially cylindrical lamp bulb 10 with a pinch foot l0a sealed in a gastight. fashion. The dome lOb of the lamp bulb 10 is provided with an optically absorbing coating. Serving as light source is an incandescent filament 11, which is aligned parallel to the lamp bulb axis and is connected in an electrically conducting fashion to two supply leads 12,13 which are guided out of the pinch foot 10a and consist of molybdenum wire. The pinch foot 10a of the lamp bulb 10 is fixed in a metallic holder, which comprises the cup-shaped holder part 14a, the intermediate ring 14e and the annular support sleeve 14b. In addition to the metallic holder 14a, 14b, the lamp cap also has a plastic cap part 15, which is provided with electric terminals 16, 17 of the lamp and in which the annular metallic support sleeve 14d is anchored. The support sleeve 14b has three reference noses 14c, lying in a plane and a press-on spring 14d for mounting the lamp in the reflector 20 of a motor vehicle headlight. The sealing of the reflector 20 is performed by means of a silicone sealing ring 19 which bears against the outer wall 20b of the reflector 20 and against the annular flange 15a of the plastic cap part 15. The design of the lamp in accordance with the preferred exemplary embodiment, and its use in a headlight are illustrated diagrammatically in Figure 1. The top side of the annular flange 15a, which faces the lamp bulb 10, is printed with an optically reflecting, aluminium-containing, paint layer 21 (Figure 2j which essentially has the same degree of optical reflection and the same hue as the reflector 20.
The invention is not restricted to the exemplary embodiment explained in more detail above. For example, instead of the application of a paint layer, it is also possible to carry out vapour deposition of an aluminium layer on the topside of the annular flange 15a. A
further alternative to the paint layer is to cover the topside of the annular flange 15a with an aluminium sheet whose surface facing the lamp bulb is polished.
Instead of an aluminium layer, it is also possible for the topside of the annular flange 15a to be provided with a different metallic coating, if the latter has a similarly high degree of reflection as the reflective surface of the headlight reflector. For example, the reflecting coating 21 can also comprise a steel sheet which covers the topside of the annular flange 15a which faces the lamp bulb.
Claims (5)
1. Electric lamp for a vehicle headlight, having a lamp cap, a transparent lamp bulb (10) and at least one luminous means (11) surrounded by the lamp bulb (10), the lamp cap having a plastic cap part (15), provided with the electric terminals (16,17) of the lamp, and at least one metallic holder part (14a-14e), anchored in the plastic cap part (15), for the lamp bulb (10), characterized in that the surfaces (15a) of the plastic cap part (15) which face the lamp bulb (10) are provided with an optically reflecting coating (21).
2. Electric lamp according to Claim 1, characterized in that the optically reflecting coating (21) is an aluminium layer.
3. Electric lamp according to Claim 2, characterized in that the optically reflecting coating (21) is an aluminium-containing paint layer.
4. Electric lamp according to Claim 2, characterized in that the optically reflecting coating (21) is an aluminium sheet which covers the plastic surfaces (15a) which face the lamp bulb, and whose side facing the lamp bulb is polished.
5. Electric lamp according to Claim 1, characterized in that the optically reflecting coating (21) comprises a steel sheet which covers the plastic surfaces (15a) facing the lamp bulb.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19855403A DE19855403A1 (en) | 1998-12-01 | 1998-12-01 | Electric lamp for a vehicle headlight |
| DE19855403.6 | 1998-12-01 | ||
| PCT/DE1999/003762 WO2000033343A1 (en) | 1998-12-01 | 1999-11-26 | Electrical lamp for a headlight of a vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2318850A1 true CA2318850A1 (en) | 2000-06-08 |
Family
ID=7889633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002318850A Abandoned CA2318850A1 (en) | 1998-12-01 | 1999-11-26 | Electric lamp for a vehicle headlight |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP1051720B1 (en) |
| JP (1) | JP4436570B2 (en) |
| KR (1) | KR100669555B1 (en) |
| CN (1) | CN1289446A (en) |
| AT (1) | ATE299615T1 (en) |
| CA (1) | CA2318850A1 (en) |
| DE (2) | DE19855403A1 (en) |
| ES (1) | ES2244234T3 (en) |
| HU (1) | HU225579B1 (en) |
| TW (1) | TW432444B (en) |
| WO (1) | WO2000033343A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006038144A1 (en) * | 2004-10-04 | 2006-04-13 | Philips Intellectual Property & Standards Gmbh | Lamp socket with improved heat conduction |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005007048A1 (en) * | 2005-02-15 | 2006-08-17 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Lamp base and electric lamp |
| US9285093B2 (en) * | 2013-03-15 | 2016-03-15 | Federal-Mogul Corporation | Self-locating light source module |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8001833A (en) * | 1980-03-28 | 1981-10-16 | Philips Nv | LOW-PRESSURE MERCURY DISCHARGE LAMP. |
| DE8337093U1 (en) * | 1983-12-23 | 1985-05-30 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | INTERMEDIATE BASE FOR A SINGLE-SIDED BASED DISCHARGE LAMP |
| DE8337094U1 (en) * | 1983-12-23 | 1985-05-30 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | BASE FOR A SINGLE-SIDED BASED DISCHARGE LAMP |
| FR2590725B1 (en) * | 1985-06-27 | 1988-06-17 | Elf Aquitaine | FLUORESCENT TUBE LAMP |
| CN1084042C (en) * | 1994-08-26 | 2002-05-01 | 皇家菲利浦电子有限公司 | Electric reflector lamp |
| US5506474A (en) * | 1995-03-31 | 1996-04-09 | General Electric Company | Compact fluorescent lamp using a light reflecting adhesive material |
| DE19546198A1 (en) * | 1995-12-11 | 1997-06-12 | Holzer Walter Prof Dr H C Ing | Compact lamp |
| BR9607821A (en) * | 1996-01-11 | 1998-07-07 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Electric lamp with socket and without mortar |
| JPH09320527A (en) * | 1996-05-31 | 1997-12-12 | Toko Inc | Fluorescent tube for portable lamp |
-
1998
- 1998-12-01 DE DE19855403A patent/DE19855403A1/en not_active Withdrawn
-
1999
- 1999-11-26 AT AT99962083T patent/ATE299615T1/en active
- 1999-11-26 JP JP2000585901A patent/JP4436570B2/en not_active Expired - Fee Related
- 1999-11-26 KR KR1020007008390A patent/KR100669555B1/en not_active IP Right Cessation
- 1999-11-26 CN CN99802546A patent/CN1289446A/en active Pending
- 1999-11-26 ES ES99962083T patent/ES2244234T3/en not_active Expired - Lifetime
- 1999-11-26 DE DE59912266T patent/DE59912266D1/en not_active Expired - Lifetime
- 1999-11-26 EP EP99962083A patent/EP1051720B1/en not_active Expired - Lifetime
- 1999-11-26 WO PCT/DE1999/003762 patent/WO2000033343A1/en active IP Right Grant
- 1999-11-26 HU HU0100213A patent/HU225579B1/en not_active IP Right Cessation
- 1999-11-26 CA CA002318850A patent/CA2318850A1/en not_active Abandoned
- 1999-11-30 TW TW088120913A patent/TW432444B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006038144A1 (en) * | 2004-10-04 | 2006-04-13 | Philips Intellectual Property & Standards Gmbh | Lamp socket with improved heat conduction |
| US7745982B2 (en) | 2004-10-04 | 2010-06-29 | Koninklijke Philips Electronics N.V. | Lamp socket with improved heat conduction |
Also Published As
| Publication number | Publication date |
|---|---|
| TW432444B (en) | 2001-05-01 |
| KR100669555B1 (en) | 2007-01-15 |
| EP1051720A1 (en) | 2000-11-15 |
| DE59912266D1 (en) | 2005-08-18 |
| WO2000033343A1 (en) | 2000-06-08 |
| JP4436570B2 (en) | 2010-03-24 |
| CN1289446A (en) | 2001-03-28 |
| EP1051720B1 (en) | 2005-07-13 |
| HU225579B1 (en) | 2007-03-28 |
| ES2244234T3 (en) | 2005-12-01 |
| HUP0100213A3 (en) | 2001-06-28 |
| KR20010040526A (en) | 2001-05-15 |
| DE19855403A1 (en) | 2000-06-08 |
| ATE299615T1 (en) | 2005-07-15 |
| HUP0100213A2 (en) | 2001-05-28 |
| JP2002531917A (en) | 2002-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |