EP0517878A1 - Headlamp for motor vehicles. - Google Patents
Headlamp for motor vehicles.Info
- Publication number
- EP0517878A1 EP0517878A1 EP92901842A EP92901842A EP0517878A1 EP 0517878 A1 EP0517878 A1 EP 0517878A1 EP 92901842 A EP92901842 A EP 92901842A EP 92901842 A EP92901842 A EP 92901842A EP 0517878 A1 EP0517878 A1 EP 0517878A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reflector
- central
- section
- horizontal
- images
- 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
Links
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
- 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
- F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
- F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas
Definitions
- the invention relates to a headlight for motor vehicles according to the preamble of claim 1.
- Such a headlight is known from DE-PS 753 691.
- This headlight has a reflector with a central area and a peripheral area with differently shaped reflection surfaces.
- a luminous element is arranged on the optical axis of the reflector.
- a kink is formed at the transition between the central area and the peripheral area.
- a high-beam headlight for motor vehicles is known from DE-OS 36 09 659.
- This headlight has a reflector in the form of a paraboloid of revolution / on the optical axis of which a luminous element is arranged.
- the reflector generates a parallel light beam with a pronounced maximum in the center of the light distribution, but with little scatter.
- a diffuser is provided with optical elements through which the Reflector reflected light rays are deflected in the required direction and strength.
- a disadvantage of the diffusing screen is that it cannot be arranged in a highly inclined manner, as is desirable in motor vehicles in order to achieve a low air resistance, since otherwise the light rays are also deflected vertically by the optical elements in an undesirable manner.
- the lens with the optical elements is complex to manufacture.
- the headlamp according to the invention with the characterizing features of claim 1 has the advantage that the desired light distribution is already generated by the reflector, with a horizontally scattered light beam and a high maximum light intensity in the center of the light distribution, so that the lens has no optical elements needs to show.
- FIG. 1 shows a first embodiment of the headlamp in a horizontal central section
- FIG. 2 shows the headlamp of FIG. 1 in a vertical central section
- FIG. 3 shows a front view of the reflector of the headlamp of FIG. 1
- FIG. 4 shows the light distribution generated by the reflector
- FIG. 5 shows a second embodiment of a Headlights in the horizontal center section. Description of the embodiments
- a high-beam headlight for motor vehicles shown in FIGS. 1 to 3 has a reflector 10 made of plastic, with a central axis 12 lying in the horizontal central plane 11, which is also the optical axis of the reflector 10 and on which a filament 13, not shown, is used as the luminous element Incandescent lamp is arranged.
- the incandescent filament 13 is an axial filament extending along the optical axis 12.
- the arc of a gas discharge lamp can also serve as the luminous element.
- the light exit opening 'of the reflector 10 is covered by a light disk 14 which is arranged inclined with respect to the vertical.
- the light pane 14 can also be arranged pivoted horizontally.
- the reflector 10 is divided into a central area 16 and a peripheral area 17.
- the central region 16 has an opening 20 for inserting the light source.
- the peripheral region 17 adjoins the central region 16 in the light exit direction and in the radial direction.
- the reflection area of the central area 16 contains a hyperbola 18 in the horizontal center section, as shown in FIG. 1, as a section curve.
- the reflection area of the peripheral area 17 contains a parabola 19 in the horizontal center section as a section curve.
- a kink 21 formed at the transition between the hyperbola 18 and the parabola 19 a kink 21 formed.
- the first focal point Fil of the hyperbola 18 and the focal point FP of the parabola 19 are located at the same location, approximately in the middle of the filament 13.
- the reflection surface of the central area contains a parabola 22 as the cutting curve is not identical to parabola 19.
- the reflection surface of the peripheral region 17 contains a parabola 23 in the vertical center section as a section curve, which is identical to the parabola 19 in the horizontal center section, so that the reflection surface of the peri pheres area is formed by a paraboloid of revolution.
- a radial step 24 is formed as a discontinuity.
- the focal points F of the parabolas 22 and 23 are located at the same location as the focal points of the intersection curves in the horizontal central section, approximately in the middle of the filament 13.
- the parabolas 22 and 23 have different focal lengths. In the transition from the vertical central section to the horizontal central section, the intersection curves resulting in axial longitudinal sections through the central region 16 continuously pass from the parabola 22 into the hyperbola 18.
- the step 24 present in the vertical central section is becoming less pronounced and in the horizontal center ⁇ only a kink 21 or a smaller step is still available.
- the peripheral region 17 of the reflector can be delimited at its upper and lower edge region by horizontal, flat surfaces 26, so that the parabola 23 does not extend to the front edge 27 of the reflector in the vertical central section.
- FIG. 4 shows the light distribution delivered by the reflector 10 on a measuring screen arranged perpendicular to the optical axis 12 using several isolux lines 28 to 31, which represent lines of the same light intensity values of 0.1, 1, 10 and 100 lux.
- the light distribution has a large horizontal width and a pronounced maximum in the center with high light intensity values.
- the width of the light distribution is achieved by large images of the filament 13 reflected by the central region 16 of the reflector 10.
- a horizontally scattered light beam is generated, which determines the width of the light distribution and only a small proportion of the maximum light intensity in the center of the Light distribution delivers.
- Small images of the incandescent filament 13 are reflected into the center of the light distribution by the peripheral region 17 of the reflector 10, so that the desired high light intensity values arise there.
- the parabola 23 in the vertical central section of the peripheral area can also be different from the parabola 19 in the horizontal central section, the reflecting surface of the peripheral area 17 then being formed by a general paraboloid.
- the reflection surface of the peripheral region 17 can be designed such that the intersection curves in the horizontal and vertical center section are not pure parabolas, but rather their equations differ from the equation of a parabola, for example by correction factors. Otherwise, the reflection surface of the central area 16 in the horizontal central section can also contain an ellipse instead of the hyperbola 18 as a section curve, as a result of which a horizontally scattered light beam is likewise generated from the central area.
- the central region of the reflector can be designed such that this light reflects into the center of the light distribution and the peripheral region can be designed such that this light reflects in a horizontally scattered light bundle.
- the peripheral region of the reflector is designed as described in the first exemplary embodiment.
- the central region 116 is divided into two halves 37 and 38 which abut one another in the vertical central plane 36.
- the optical axes 39 and 40 of the two halves extend pivoted to one another in the horizontal central plane 11.
- the optical axes 39, 40 can also can be arranged parallel to each other.
- the halves 37, 38 have reflection surfaces which each contain a parabola in vertical axial sections through the respective optical axis 39, 40. In the respective horizontal axial section, the reflection surfaces of the halves 37, 38 each contain an ellipse 43.
- F, F of the parabolas and the first focal points F, F PL PR EL ER of the ellipses 43 coincide for half each and lie on the respective optical axis 39, 40 on a perpendicular to the central axis 12 through the center of the filament 13.
- the second focal points ⁇ points F ', F' of the ellipses 43 lie in the light exit direction
- EL ER device on the respective optical axis 39, 40.
- a kink 21 or a small step is formed between the central area 116 and the peripheral area 17.
- a step is formed in the vertical central section as in the reflector shown in FIG. With this configuration of the central area 116, a horizontally scattered light beam is generated by the latter.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Le projecteur présente un réflecteur (10) avec une zone centrale (16) et une zone périphérique (17) possédant des surfaces réfléchissantes différentes. Sur l'axe médian (12) du réflecteur est disposée une source lumineuse (13). La surface réfléchissante de la zone centrale (16) présente dans sa direction médiane verticale une parabole et dans sa section médiane horizontale une hyperbole. La surface réfléchissante de la zone périphérique (17) présente des paraboles à la fois dans sa section médiane verticale et dans sa section médiane horizontale. A travers la zone centrale (16), des images de grande dimension de la source lumineuse (13) sont reflétées sous la forme d'un faisceau lumineux dispersé horizontalement. A travers la zone périphérique (17), des images de petite dimension de la source lumineuse (13) sont reflétées vers le centre de la répartition de la lumière, de sorte que la répartition de la lumière présente globalement d'une part une grande largeur et d'autre part un maximum d'intensité lumineuse nettement marquée au centre.The projector has a reflector (10) with a central area (16) and a peripheral area (17) having different reflecting surfaces. On the median axis (12) of the reflector is arranged a light source (13). The reflecting surface of the central zone (16) has in its vertical median direction a parabola and in its horizontal median section a hyperbola. The reflecting surface of the peripheral zone (17) has parabolas both in its vertical middle section and in its horizontal middle section. Through the central area (16), large images of the light source (13) are reflected in the form of a horizontally dispersed light beam. Through the peripheral zone (17), small images of the light source (13) are reflected towards the center of the light distribution, so that the light distribution has on the one hand a large width and on the other hand a maximum of clearly marked light intensity in the center.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4100411 | 1991-01-09 | ||
DE4100411A DE4100411A1 (en) | 1991-01-09 | 1991-01-09 | HEADLIGHTS FOR MOTOR VEHICLES |
PCT/DE1991/001004 WO1992012379A1 (en) | 1991-01-09 | 1991-12-21 | Headlamp for motor vehicles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0517878A1 true EP0517878A1 (en) | 1992-12-16 |
EP0517878B1 EP0517878B1 (en) | 1995-11-15 |
Family
ID=6422719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92901842A Expired - Lifetime EP0517878B1 (en) | 1991-01-09 | 1991-12-21 | Headlamp for motor vehicles |
Country Status (6)
Country | Link |
---|---|
US (1) | US5400226A (en) |
EP (1) | EP0517878B1 (en) |
JP (1) | JP3156793B2 (en) |
DE (2) | DE4100411A1 (en) |
ES (1) | ES2079848T3 (en) |
WO (1) | WO1992012379A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2750647B2 (en) * | 1992-08-14 | 1998-05-13 | 株式会社小糸製作所 | Vehicle headlight reflector |
US5826973A (en) * | 1995-09-14 | 1998-10-27 | Melzian; John M. | Illuminated display with uniform luminance |
JP3193604B2 (en) * | 1995-12-25 | 2001-07-30 | 株式会社小糸製作所 | Vehicle lamp having a discharge bulb |
DE19603529A1 (en) * | 1996-02-01 | 1997-08-07 | Bosch Gmbh Robert | Car headlamp |
US20050013140A1 (en) * | 2003-07-17 | 2005-01-20 | Currie Joseph Edward | Original equipment automotive elongated side marker lights |
FR2875578B1 (en) * | 2004-09-21 | 2006-12-15 | Valeo Vision Sa | SIGNALING LIGHT, IN PARTICULAR FOR MOTOR VEHICLE |
US7697421B2 (en) * | 2005-04-21 | 2010-04-13 | Avaya Inc. | Method and apparatus for quality-of-service-based admission control |
US8081565B2 (en) * | 2005-04-21 | 2011-12-20 | Avaya Inc. | Method and apparatus for adaptive control of system parameters for admission control |
US7357545B2 (en) * | 2005-08-10 | 2008-04-15 | Visteon Global Technologies, Inc. | Multi-focal lens for bi-functional headlamp |
PL2276973T3 (en) * | 2008-05-23 | 2013-04-30 | Huizhou Light Engine Ltd | Non-glare reflective led lighting apparatus with heat sink mounting |
US9234646B2 (en) * | 2008-05-23 | 2016-01-12 | Huizhou Light Engine Ltd. | Non-glare reflective LED lighting apparatus with heat sink mounting |
JP5797099B2 (en) * | 2011-11-21 | 2015-10-21 | 株式会社小糸製作所 | Lighting fixtures for vehicles |
US10018341B2 (en) | 2014-07-31 | 2018-07-10 | JST Performance, LLC | Method and apparatus for a light collection and projection system |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB178388A (en) * | 1921-01-04 | 1922-04-04 | Duncan James Ritchie | Improvements in headlamps for automobiles |
US1394896A (en) * | 1921-01-17 | 1921-10-25 | Jr Cromwell A B Halvorson | Headlight-reflector |
US1575327A (en) * | 1924-05-02 | 1926-03-02 | Garford Francis Sydney | Headlight |
US1610124A (en) * | 1924-06-30 | 1926-12-07 | Hall C M Lamp Co | No-glare headlight |
GB440293A (en) * | 1934-11-20 | 1935-12-24 | Andrew Lumisden Strange | Improvements in and connected with anti-dazzle devices for vehicle headlamps |
DE753691C (en) * | 1940-05-17 | 1953-01-19 | Schanzenbach & Co G M B H | Broad beam mirror reflector |
FR973391A (en) * | 1948-10-09 | 1951-02-09 | Reflector | |
NL287712A (en) * | 1962-01-17 | |||
US3492474A (en) * | 1966-12-02 | 1970-01-27 | Koito Mfg Co Ltd | Reflector with compound curvature reflecting surface |
US4447865A (en) * | 1982-05-13 | 1984-05-08 | General Electric Company | Reflector lamp |
FR2528537B1 (en) * | 1982-06-09 | 1987-03-20 | Cibie Projecteurs | CROSSING PROJECTORS FOR MOTOR VEHICLES |
FR2545152B1 (en) * | 1983-04-27 | 1985-08-16 | Cibie Projecteurs | |
US4494176A (en) * | 1984-03-14 | 1985-01-15 | General Electric Company | Lamps having multiple and aimed parabolic sections for increased useful light output |
HU191444B (en) * | 1984-09-21 | 1987-02-27 | Tungsram Rt,Hu | Reflector lamp |
FR2579721B1 (en) * | 1985-03-26 | 1988-10-14 | Cibie Projecteurs | TWO PROJECTOR ROAD LIGHTING ASSEMBLY FOR MOTOR VEHICLE |
US4825344A (en) * | 1986-02-20 | 1989-04-25 | Stanley Electric Co., Ltd. | Headlamp for vehicles |
JP2604646B2 (en) * | 1991-01-28 | 1997-04-30 | 株式会社小糸製作所 | Vehicle headlight reflector |
DE4123658A1 (en) * | 1991-07-17 | 1993-01-21 | Bosch Gmbh Robert | HEADLIGHTS FOR MOTOR VEHICLES |
-
1991
- 1991-01-09 DE DE4100411A patent/DE4100411A1/en not_active Withdrawn
- 1991-12-21 ES ES92901842T patent/ES2079848T3/en not_active Expired - Lifetime
- 1991-12-21 EP EP92901842A patent/EP0517878B1/en not_active Expired - Lifetime
- 1991-12-21 WO PCT/DE1991/001004 patent/WO1992012379A1/en active IP Right Grant
- 1991-12-21 DE DE59106919T patent/DE59106919D1/en not_active Expired - Fee Related
- 1991-12-21 US US07/930,388 patent/US5400226A/en not_active Expired - Fee Related
- 1991-12-21 JP JP50163292A patent/JP3156793B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9212379A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5400226A (en) | 1995-03-21 |
WO1992012379A1 (en) | 1992-07-23 |
JPH05505495A (en) | 1993-08-12 |
EP0517878B1 (en) | 1995-11-15 |
DE4100411A1 (en) | 1992-07-16 |
ES2079848T3 (en) | 1996-01-16 |
JP3156793B2 (en) | 2001-04-16 |
DE59106919D1 (en) | 1995-12-21 |
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