EP0112397A1 - Fahrzeugscheinwerfer - Google Patents

Fahrzeugscheinwerfer Download PDF

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Publication number
EP0112397A1
EP0112397A1 EP82111721A EP82111721A EP0112397A1 EP 0112397 A1 EP0112397 A1 EP 0112397A1 EP 82111721 A EP82111721 A EP 82111721A EP 82111721 A EP82111721 A EP 82111721A EP 0112397 A1 EP0112397 A1 EP 0112397A1
Authority
EP
European Patent Office
Prior art keywords
reflecting
reflector
vehicle headlamp
light
filament
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.)
Withdrawn
Application number
EP82111721A
Other languages
English (en)
French (fr)
Inventor
Masashi Maekawa
Tatsumi Hasegawa
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.)
Ichikoh Industries Ltd
Original Assignee
Ichikoh Industries 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
Application filed by Ichikoh Industries Ltd filed Critical Ichikoh Industries Ltd
Priority to EP82111721A priority Critical patent/EP0112397A1/de
Priority to DE198282111721T priority patent/DE112397T1/de
Publication of EP0112397A1 publication Critical patent/EP0112397A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10—Protection of lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • 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
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/338—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having surface portions added to its general concavity

Definitions

  • the present invention relates to a vehicle headlamp and, more particularly, a vehicle headlamp having a front lens particularly made of synthetic resin.
  • the conventional front lens used to the vehicle headlamp is made by press-molding a mass of molten glass, but a front lens made of synthetic resin has been developed because it can be light-weighted and because a plurality of prisms can be easily formed thereon to control the light froma filament.
  • Fig. 1 is a front view showing the conventional headlamp
  • Fig. 2 is a sectional view taken along the line I - I in Fig. 1.
  • a synthetic resin lens 1 is attached to the front end of a reflector 2.
  • the reflector 2 has a reflecting surface 3 which is made substantially parabolic, and to the reflecting surface 3 is fixed a lamp holder 4 for attaching a lamp 6 to the reflector 2.
  • the lamp 6 attached to the lamp holder 4 by means of a set spring 5 includes a main filament 8, a sub-filament 9 and a light shielding cap 10 in a glass envelope 7, said light shielding cap 10 serving to cover about the lower half of said sub-filament 9.
  • the main filament 8 is positioned nealy corresponding to the focussing point (f) of said reflector 2 while the sub-filament 9 is positioned ahead the focussing point (f).
  • Numeral 11 coat represents a light shielding applied to the front end of the glass envelope 7.
  • An object of the present invention is to reduce the amount of reflected light incident onto a synthetic resin lens at an upper area thereof and to prevent heat from being concentrated onto said area.
  • Another object of the present invention is to provide a simple construction for preventing heat from being concentrated onto the upper area of said synthetic resin lens.
  • a vehicle headlamp according to the present invention is of rectangular shape and includes a lens 20 attached to the front end of a reflector 30, as shown in Fig. -4.
  • the lens 20 is made of transparent synthetic resin such as polycarbonate, for example, and comprises a lens face 21 formed on the inner surface thereof and having a plurality of prisms to control light, and a side wall 22 enclosing the lens face 21.
  • the side wall 22 is air-tightly attached to the opened end face of the reflector 30 by means of a bonding agent 25 which is previously filled in a groove 32 formed on the opened front end face of said reflector 30.
  • the reflector 30 has about a parabolic reflecting surface 33 inside.
  • the reflecting surface 33 has an attachment hole, in which is fixed a lamp holder 60 for attaching a lamp 50 thereto.
  • the reflector 30 may be formed integrally with the lamp holder 60.
  • the lamp holder 60 is formed cylindrical so as to enable a glass envelope 51 for the lamp 50 to be inserted therethrough.
  • the lamp holder 60 has a stepped portion 61 inside, on which a flange 52 of the lamp 50 is rested.
  • the lamp 50 is attached to the lamp holder 60 in such a way that the flange 52 is urged against the stepped portion 61 by means of a set spring 65.
  • the lamp 50 includes a main filament 54, a sub-filament 55, and a light shielding cap 56 inside the glass envelope 51, to the front end of which is applied a light coat shielding 53, said light shielding cap 56 covering substantially the lower half of the sub-filament 55.
  • the sub-filament 55 is positioned ahead the main filament 54 in the glass envelope 51.
  • Halogen H 4 lamp according to ECE regulation may be employed as the lamp 50.
  • the lamp 50 is attached to the lamp holder 60 in such a way that the sub-filament 55 is positioned ahead the focussing point (f) of the reflector 30 and that the main filament 54 is positioned substantially at the focussing point (f).
  • the sub-filament 55 is positioned ahead the focussing point (f) but with its center line located on the optical axis (X), while the main filament 54 is positioned to become contacted with the optical axis (X) and the focussing point (f) but with its center line located below the optical axis (X).
  • the main filament 54 is used as upper beam and the sub-filament 55 is used as dipped beam.
  • Fig. 5 is an enlarged view showing a portion III in Fig. 4.
  • the reflecting parabolic face 33 comprises applying an undercoat 34 to the inner face of a parabolic coat reflector body 31, vacuum-vaporing a reflecting 35 such as aluminium, for example, to the undercoat 34, and applying a transparent top coat 36 to the reflecting film 35, said transparent top coat 36 serving to protect the reflecting coat 35.
  • the undercoat 34 is about 10 - 15p thick and the coat reflecting 35 about 0.05 ⁇ thick in this embodiment.
  • the reflector body 31 is made of metal or of synthetic resin such as polybuthylene terephthalate, for example.
  • a zone 40 where a light reducing means is provided to reduce the amount of light coming from the sub-filament 55 onto the upper area (A) of the lens face 21.
  • the position of said zone 40 is above the lamp 50 and along an axis (Y) vertically passing through the optical axis (X).
  • the light reducing means arranged at the zone 40 is intended to irregularly reflecting light, as shown in Fig. 5.
  • This irregularly reflecting means comprises making the zone 40 undercoatless 41.
  • the reflector body 31 is made of metal or synthetic resin, its surface is made or molded slightly rough and uneven. This slightly rough and uneven surface of said reflector body 31 is therefore covered by the undercoat 34 coat to give no influence to the reflecting 35.
  • Light (L) reflected by the reflecting parabolic face 33 is thus reflected in the predetermined direction.
  • the zone 40 is made undercoatless 41, however, the rough surface of said reflector coat body 31 is followed by the reflecting 35 to thereby reflect light irregularly.
  • Light (L') reflected by the undercoatless zone 40 is thus reduced in absolute magnitude when incident onto the area (A). Even when additionally combined with atmosphere inside the headlamp, therefore, the area (A) can be kept lower in temperature and prevented from becoming softened.
  • Fig. 6 shows another embodiment of the present invention and is an enlarged view showing a portion thereof corresponding to the portion III in Fig. 4.
  • the reflecting parabolic face 33 of the reflector 30 comprises applying the undercoat 34 to the inner suface of the parabolic reflector body 31 and then further applying the reflecting coat 35 on the undercoat 34.
  • the transparent top coat 36 is also applied on the reflecting coat 35.
  • the zone 40 where the light reducing means is arranged is also formed at the same location as that in the above-described embodiment.
  • This light reducing means is also intended to reflect light irregularly and formed by positively providing rough and uneven portion 42 on the inner surface of said reflector body 31.
  • the reflector body 31 is made of metal, its surface is made rough and uneven by shot-blasting.
  • it is made of synthetic resin its surface is molded rough and uneven by a molding die.
  • the reflecting coat 35 is applied to the rough and uneven portion 42 with the undercoat 34 interposed therebetween.
  • the undercoat 34 can not to flat and smoth the surface of the rough portion 42, because the thickness of undercoat 34 is too thin. Accordingly, the reflecting coat 35 is left rough and uneven. Light (L) of the sub-filament 55 is thus irregularly reflected by the zone 40 where the irregularly-reflecting means is provided. Therefore, the amount of light incident from the zone 40 onto the area (A) is reduced to keep the area (A) lower in temperature, thus preventing the area (A) from becoming softened.
  • Figs. 7 throug 9 show a further embodiment of the present invention. Same parts as those in the above-described embodiments will be represented by same reference numerals and description on these parts will be omitted.
  • the light reducing means arranged at the zone 40 is intended to reflect light diffusedly in this embodiment.
  • This diffusedly-reflecting means comprises providing a plurality of slanted faces 43 on the inner face of the reflector body 31 at such angles that enable the amount of reflected light incident onto the area (A) to be reduced.
  • Each of slanted coat faces 43 is slanted downward and the reflecting 35 is applied to these slanted faces 43 with the undercoat 34 Light interposed therebetween.
  • radiated from the- sub-filament 55 are diffusedly reflected by each of slanted faces 43, as shown in Fig. 9.
  • the absolute magnitude of light (L') reflected incident onto the area (A) is thus reduced to thereby protect the area (A) from heat.
  • Figs. 10 and 11 are front and sectional views showing a variation of the embodiment shown in Figs. 7 through 9.
  • Slanted faces 44 which serve to function as the diffusedly reflecting means are formed along the vertical axis (Y). light Therefore, radiated from the sub-filament 55 are reflected diffusedly in right and left directions. As the result, the amount of light (L') reflected incident onto the area (A) can be reduced, thus protecting the area (A) from heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP82111721A 1982-12-17 1982-12-17 Fahrzeugscheinwerfer Withdrawn EP0112397A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP82111721A EP0112397A1 (de) 1982-12-17 1982-12-17 Fahrzeugscheinwerfer
DE198282111721T DE112397T1 (de) 1982-12-17 1982-12-17 Fahrzeugscheinwerfer.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82111721A EP0112397A1 (de) 1982-12-17 1982-12-17 Fahrzeugscheinwerfer

Publications (1)

Publication Number Publication Date
EP0112397A1 true EP0112397A1 (de) 1984-07-04

Family

ID=8189407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111721A Withdrawn EP0112397A1 (de) 1982-12-17 1982-12-17 Fahrzeugscheinwerfer

Country Status (2)

Country Link
EP (1) EP0112397A1 (de)
DE (1) DE112397T1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355815A2 (de) * 1988-08-23 1990-02-28 Ichikoh Industries Limited Kraftfahrzeugscheinwerfer
EP0561410A1 (de) * 1992-03-18 1993-09-22 Ichikoh Industries Limited Kraftfahrzeugscheinwerfer nach dem Projektionsprinzip
EP0687852A1 (de) * 1994-06-15 1995-12-20 Vari-Lite, Inc. Lichtdämpfungsblatt
ES2312260A1 (es) * 2006-08-04 2009-02-16 Odel-Lux, S.A. Reflector con facetado pseudo aleatorio.
EP2083213A1 (de) 2008-01-25 2009-07-29 Stanley Electric Co., Ltd. Fahrzeuglicht
US7595182B2 (en) 2003-12-03 2009-09-29 Meiji Seika Kaisha, Ltd., Endoglucanase STCE and cellulase preparation containing the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1413315A (en) * 1919-09-05 1922-04-18 Correll Percy Edward Reflector
US1737027A (en) * 1924-12-13 1929-11-26 William H Schoonmaker Headlight
FR2055889A5 (de) * 1969-08-05 1971-05-14 Cibie Projecteurs
GB2011600A (en) * 1977-12-29 1979-07-11 Cibie Projecteurs Vehicle headlights

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1413315A (en) * 1919-09-05 1922-04-18 Correll Percy Edward Reflector
US1737027A (en) * 1924-12-13 1929-11-26 William H Schoonmaker Headlight
FR2055889A5 (de) * 1969-08-05 1971-05-14 Cibie Projecteurs
GB2011600A (en) * 1977-12-29 1979-07-11 Cibie Projecteurs Vehicle headlights

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355815A2 (de) * 1988-08-23 1990-02-28 Ichikoh Industries Limited Kraftfahrzeugscheinwerfer
EP0355815A3 (de) * 1988-08-23 1991-01-02 Ichikoh Industries Limited Kraftfahrzeugscheinwerfer
EP0561410A1 (de) * 1992-03-18 1993-09-22 Ichikoh Industries Limited Kraftfahrzeugscheinwerfer nach dem Projektionsprinzip
US5408390A (en) * 1992-03-18 1995-04-18 Ichikoh Industries, Ltd. Projector-type headlamp for vehicles
EP0687852A1 (de) * 1994-06-15 1995-12-20 Vari-Lite, Inc. Lichtdämpfungsblatt
US7595182B2 (en) 2003-12-03 2009-09-29 Meiji Seika Kaisha, Ltd., Endoglucanase STCE and cellulase preparation containing the same
ES2312260A1 (es) * 2006-08-04 2009-02-16 Odel-Lux, S.A. Reflector con facetado pseudo aleatorio.
EP2083213A1 (de) 2008-01-25 2009-07-29 Stanley Electric Co., Ltd. Fahrzeuglicht

Also Published As

Publication number Publication date
DE112397T1 (de) 1984-11-08

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Inventor name: HASEGAWA, TATSUMI

Inventor name: MAEKAWA, MASASHI