EP1000294A1 - Projecteur de vehicule automobile a miroir dote d'au moins une joue laterale - Google Patents
Projecteur de vehicule automobile a miroir dote d'au moins une joue lateraleInfo
- Publication number
- EP1000294A1 EP1000294A1 EP99937975A EP99937975A EP1000294A1 EP 1000294 A1 EP1000294 A1 EP 1000294A1 EP 99937975 A EP99937975 A EP 99937975A EP 99937975 A EP99937975 A EP 99937975A EP 1000294 A1 EP1000294 A1 EP 1000294A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cheek
- mirror
- cheeks
- source
- light
- 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
- F21S41/338—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
-
- 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
- F21S41/17—Discharge light sources
- F21S41/173—Fluorescent light sources
Definitions
- the present invention relates generally to motor vehicle headlamps.
- a projector comprises a filament or arc lamp, the source of which is placed in a focal region of a mirror, which may be a paraboloid of revolution or any other surface capable of producing, possibly in combination with optical arrangements provided on a lens, a beam of desired photometry.
- the mirror of a projector can have side cheeks, especially if the shape of the mirror is elongated in the vertical direction - although this kind of projector has not developed because such a vertically elongated shape is not very conducive to generate a light beam which has a satisfactory photometry and in particular a reduced thickness.
- Document FR-A-2 639 295 also discloses a projector, the mirror of which has two side cheeks in the form of parabolic cylinders intended to reflect. the radiation from the source to generate beam portions strongly deflected laterally.
- FR-A-2 639 294 discloses a headlamp, the mirror of which has cheeks capable of superimposing on the relatively narrow beam parts of the larger beam parts, but participating in the beam over its entire lateral extent.
- the present invention provides a motor vehicle headlamp, comprising a light source cooperating with a mirror, and a lens, the mirror comprising a bottom and at least one lateral cheek exposed to the radiation emanating from the source, characterized in that at least one of the cheeks is adapted in at least one zone to reflect light to extend laterally, with continuity, the beam generated by the bottom of the mirror, substantially without reinforcing said beam in the axis of the road, and in that the ice is smooth or very slightly deviating.
- aspects of the projector according to the invention are as follows: - the cheek or at least one of the cheeks has a reflecting surface capable of positioning all the images of the light source so that they are located at the below a predetermined cutoff of the beam emitted by the projector. - The images of the light source generated by the ear or at least one of the cheeks have their highest points essentially aligned on said cut.
- the source is elongated and oriented essentially horizontally and transversely to the optical axis of the mirror, and the cheek or at least one of the cheeks has a vertical profile consisting of two upper and lower half-parabolas whose focal lengths are different one from the other and such that the respective focal lines pass in the vicinity of the end of the source close to the cheek and the end of the source distant from the cheek.
- the source is elongated and oriented essentially along the optical axis of the mirror, and the cheek or at least one of the cheeks has a profile such that a light ray emitted tangentially by an edge of the source is reflected in a essentially horizontal plane, the light rays emitted by the rest of the source being reflected with a downward inclination relative to said horizontal plane.
- the cheek or at least one of the cheeks has a vertical profile in the general shape of a parabola whose focal length is such that the focal line of the cheek passes in the vicinity of the source.
- the axis of said dish is tilted down so as to fold down the light generated by the cheek or at least one of the cheeks.
- the cheek has a cylindrical shape.
- the reflecting surface of the cheek or at least one cheek is constituted by a plurality of staggered steps, said cheek having a vertical section in the general shape of a vertical straight line.
- the bottom of the mirror has a height greater than its width. the or each cheek of the mirror is made separately from the bottom and attached to said bottom.
- the horizontal section of the or each cheek is inclined outward relative to an optical axis of the bottom of the mirror.
- FIG. 1 is a front view of a projector mirror according to the invention, and of the associated source
- FIG. 2 is a view in axial horizontal section of the mirror and of the source of FIG. 1
- FIG. 3 is a axial vertical section view of the mirror and the source of Figures 1 and 2
- Figure 4 is a sectional view along line IV-IV of the mirror of Figure 2
- Figure 5 is a sectional view along the same line, of a variant embodiment of the mirror
- FIGS. 1 is a front view of a projector mirror according to the invention, and of the associated source
- FIG. 2 is a view in axial horizontal section of the mirror and of the source of FIG. 1
- FIG. 3 is a axial vertical section view of the mirror and the source of Figures 1 and 2
- Figure 4 is a sectional view along line IV-IV of the mirror of Figure 2
- Figure 5 is a sectional view along the same line, of a variant embodiment of the mirror
- FIGS. 6 and 7 illustrate by sets of isocandela curves the appearance of parts of the beam generated by a zone of vision of the mirror
- FIGS. 8 and 9 illustrate by isocandela curves appearance of two dipped beams of light of European type obtained according to the present invention
- FIG. 10 is a view in axial vertical section illustrating a profile which can be used to make the bottom or the cheeks of the mirror of a projector according to the invention
- FIG. 11 is a front view illustrating a possible design of the bottom area of the mirror of a projector according to the invention
- FIG. 1 to 3 there is shown a part of a motor vehicle headlight, which comprises a light source 10, a beam forming mirror 20, and a closing glass (not shown) as well as appropriate, a housing and the various fixing and adjusting members usually fitted to such a projector.
- the source 10 is preferably oriented horizontally and perpendicular to the optical axis y-y of the mirror. It can be formed by the filament of a transverse filament lamp such as a standard lamp "H3" mounted at the bottom of the mirror, or by the filament of an axial filament lamp, in particular of the "Hl” or “H7” type. mounted in the mirror parallel to the horizontal transverse direction xx. It may also be the luminescent arc of a discharge lamp.
- the mirror 20 preferably has a height equal to or greater than its width, and has a bottom zone 21 and two lateral cheeks 22 and 23 truncating the bottom zone at its lateral edges.
- the reflecting surface of the bottom zone 21 is capable of generating by itself a light beam possibly delimited by a top cut. It can typically be a fog beam with horizontal cut-off, a “European” passing beam with a horizontal half-cut and a half-cut raised at around 15 °, a passing beam in accordance with regulations the United States from America, with two horizontal half-cuts offset in height, etc., or a main beam.
- document FR-A-2 602 305 in the name of the Applicant describes a fog light with transverse filament, the teachings of which can be used to produce the bottom zone 21 in such an application.
- the horizontal and vertical dimensions of the mirror, together with the basic focal distance of the bottom zone 21, can cause such a mirror to be delimited by two lateral cheeks 22 and 23 and according to the invention, these cheeks are used, which by example its made in one piece with the bottom zone 21 and coated with the same reflective coating as the latter, so that they contribute to the beam formed.
- each of the cheeks is given a shape such that they reflect the light coming from the source 10 so as to complete in width the part of the beam generated by the bottom 21, while ensuring that the reflected light is placed at a suitable height with respect to said beam portion, this height varying as a function of the type of beam generated.
- the cheeks 22 and 23 can be given the shape of parabolic cylinders of horizontal generators GH2 and GH3 essentially parallel to the optical axis yy, or having a slight opening relative to this axis as illustrated in FIG. 2, in particular to allow easy demolding of the mirror 20 when the latter is manufactured by injection.
- the vertical sections of these parabolic cylinders 22 and 23 are in this case parabolas whose focal lengths are such that the focal lines of the cylinders pass in the vicinity, or preferably in the center, of the source 10.
- the cheeks 22 and 23 will produce images of the source 10 which for the most part will lie astride the horizontal plane passing through the headlight, to illuminate the front of the vehicle both in the distance and angularly offset to the outside.
- FIG. 2 shows that, in the illustrated embodiment, the angular coverage CA of the zone 22 is between approximately 22 ° and approximately 43 ° in the left part of the illumination field, while the angular coverage of the cheek 23 will preferably be similar, but in the right part of the lighting cnamp.
- zone 21 is able to generate a beam of road having a peak of concentration in the axis of the road and a certain spreading in width, for example of the order of 25 to 30 ° towards the. left and right, then the resulting beam produced by zones 21, 22 and 23 will present both the aforementioned concentration point and an increased width, this without significant intervention of the closing glass, which gives excellent comfort visual.
- the above solution is not necessarily well suited, at least on the side of the road where vehicles traveling in the opposite direction 10
- the cheeks 22 and 23 are preferably always produced in the form of cylinders, but they are given a vertical profile such that the resulting surfaces are capable of bringing all the images of the source below the desired cutoff. .
- this vertical profile is constituted by an upper half-parabola having a first focal length, and by a lower half-parabola having a second focal length greater than the first.
- Figure 4 illustrates this embodiment.
- the first and second focal lengths are chosen such that the resulting focal lines, the traces of which are illustrated respectively by Fh and by Fb in FIG. 4, pass respectively behind and in front of the projection of the source 10 illustrated on this same figure, and preferably in the close vicinity of the rear and front ends of this projection
- the cheeks 22 and 23 can be produced in the form of reflective rungs of constant or variable vertical pitch, an example of which in vertical profile is illustrated in FIG. 5.
- the useful surfaces of these rungs 231 are determined from parabolas of progressively increasing focal lengths so as to offer, in this case, the same optical behavior as the smooth profile of FIG. 4.
- FIG. 4 and the stepped surface of FIG. 5 can also be made according to style criteria, the case of FIG. 4 giving a spotlight contour of the type of that illustrated in FIG. 1 , with in particular a rounded shape which can be interesting, while the case of FIG. 5 gives an essentially rectangular outline which can also be interesting. Furthermore, intermediate curvatures of the cheeks 22 and 23 can be obtained by hybridizing the solutions of FIGS. 4 and 5.
- the left cheek 23, lighting to the right can without inconvenience, or even desirably, place the images of the source 10 higher, insofar as of course these remain located below the half inclined cut.
- this opening the parabolic cylinder as described above in the case of a headlamp for main beam, or even a cylindrical surface or not aligning the images of the source below the raised half-cut. of the beam.
- the reflecting surfaces of the cheeks 22 and 23 are not cylindrical surfaces but have 13
- the bottom zone 21 of the mirror has a height of 150 mm and a width of 80 mm, the source 10 consisting of a transverse filament of length (measured along xx) equal to about 4 mm, located at mid-height and at half-width of the mirror 20.
- cylindrical cheeks 22, 23 are used, the upper vertical half-profile of which has the shape of a parabola with a focal length of 38 mm and the lower vertical half-profile of which 14
- each cheek has, to facilitate demolding, an opening making an angle of approximately 1.5 ° relative to the y-y axis.
- this angle can be increased, firstly in order to reduce the lateral deflection of the light reflected by the cheeks - which makes it possible to adjust the width of the beam -, and secondly to allow the radiation from the bottom of the mirror, which may have a substantial lateral inclination relative to the yy axis, not to be obscured by the cheeks.
- FIG. 6 illustrates by a set of isocandela curves the shape of the beam part generated in this case by the upper half of the right cheek 22.
- the lateral shift of the light is observed between about 25 ° and about 60 ° towards the awkward, and especially the fact that the light is delimited by a clean horizontal cut.
- the cheeks 22 and 23 are produced in the form of steps with, for example with 15 steps of 5 mm in height each in each upper and lower half and with, for each of the steps, focal lengths which vary gradually. , for example between 38 mm for the rungs located at the height of the source and 50 mm for the extreme rungs.
- FIG. 7 The shape of the beam portion generated by the upper half of the right cheek 22 is illustrated in FIG. 7, where there is a great similarity with FIG. 6. 15
- FIG. 8 illustrates the appearance of a European type passing beam for right-hand traffic obtained with a bottom 21, for example produced as will be described in detail below, without the intervention of the cheeks. It is a traditional passing beam, with a moderate width.
- FIG. 9 shows the beam obtained by superimposing the parts of the beam generated by the same bottom 21 and by the right cheek 22 of the type described above with reference to FIG. 4.
- an extension "in the continuity" of the basic beam means an extension which does not give rise to the level of connection to any light hole, or giving rise to rigor in a reduction in the illumination which is not disturbing for visual comfort.
- FIGS. 10 and 11 a particular embodiment of the bottom zone 21, capable of generating by itself a portion of the beam delimited by a European “V” cut as illustrated in the figure. 8.
- the high and low vertical generators, respectively 21h and 21b, of the zone 21 are designed so as to bring all the images of the filament 10 below and essentially flush with the level horizontal, so as to be able to generate, as will be seen in detail below, a beam with good cut-off quality. 1 6
- these vertical generators are constructed by drawing straight lines Dl tangent to the surface of the filament 10, these straight lines being on the rear side of the filament with regard to the upper generator 21h, and being on the front side of the filament with regard to the generator 21b.
- Each of these lines D1, corresponding to a light ray emitted by an edge of the filament 10, are respectively associated with lines D2 parallel to the optical axis y-y of the mirror, which itself is substantially parallel to the axis of the vehicle.
- each generator is built step by step, starting from the bottom of the part 21 of the mirror which is fixed at a predetermined dimension with respect to the filament, from the different straight lines TG obtained, to define a curved line, which the in the following, we will call an "evolving generator” insofar as it does not have a fixed focus, but a set of foci which evolve progressively as one moves along said generator. It will be noted that these generators are distinguished in this from the fixed hearth generators, that is to say parabolic generators, usually used.
- ⁇ z ⁇ b. (Z.sm ⁇ - y.cos ⁇ ) ⁇ y ⁇ ⁇ z.tg ( ⁇ / 2)
- (y Z) orthonormal reference whose origin is at the center of the filament 10, y being the horizontal optical axis and z being vertical.
- Rfil radius of the filament
- the bottom 21 of the mirror has an upper half 211 and a lower half 212, which each have nine zones, respectively 2111 to 2119 and 2121 to 2129.
- the different zones have relatively similar widths, typically between 6 and 13 mm, and are essentially characterized by different horizontal generatrices, defined as a function of the desired lateral offset and spreading of the light.
- central zones 2115 and 2125 which generate images of the source 10 which are horizontal or very slightly inclined relative to the horizontal, are intended to make the horizontal cut over a large extent.
- Their horizontal generator is advantageously a straight line.
- the zones 2114 and 2126 generate images of the filament which are parallel or moderately inclined with respect to the half-cut at 15 ° typical of a European passing beam.
- the positioning of the images of the filament generated by these two zones immediately below the inclined half-cut is preferably achieved by using for these zones 2114, 2126 pieces of parabolas, that is to say having horizontal and vertical generators of different foci (the position of the focal point of the horizontal generator determining in particular the symmetrical or on the contrary asymmetrical positioning of the images with respect to the vertical axial plane passing through the reference center of the projection screen), or again and 19
- the other areas of the mirror which advantageously are also generated from the vertical generator of FIG. 10, make it possible to ensure different spreads of light, by playing on their horizontal generator, while respecting the desired cut-off.
- the cheeks associated with such a bottom zone 21 are advantageously produced as described above, and make it possible to generate a satisfactory beam without the glass having to play a role in homogenizing or correcting the light. . It can thus be smooth or very little deviating.
- the headlight may include an axially oriented source, in which case it may be advantageous, in the case of a cut-off beam, to use for the cheeks 22, 23 the vertical profile as described above with reference to the FIG. 10, because unlike the bottom 21, these cheeks then “see” the source 10 as a transverse source in a similar manner to the case of FIG. 10.
- cheeks 22 and 23 of the mirror can either be made in one piece with the bottom 21, or consist of added parts, so as to eliminate the possible difficulties of demolding an assembly bottom / cheeks in one room.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9802614A FR2775640B1 (fr) | 1998-03-04 | 1998-03-04 | Projecteur de vehicule automobile a miroir dote d'au moins une joue laterale |
FR9802614 | 1998-03-04 | ||
PCT/FR1999/000471 WO1999045311A1 (fr) | 1998-03-04 | 1999-03-03 | Projecteur de vehicule automobile a miroir dote d'au moins une joue laterale |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1000294A1 true EP1000294A1 (fr) | 2000-05-17 |
EP1000294B1 EP1000294B1 (fr) | 2007-04-04 |
Family
ID=9523629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99937975A Revoked EP1000294B1 (fr) | 1998-03-04 | 1999-03-03 | Projecteur de vehicule automobile a miroir dote d'au moins une joue laterale |
Country Status (7)
Country | Link |
---|---|
US (1) | US6543919B2 (fr) |
EP (1) | EP1000294B1 (fr) |
JP (1) | JP2001523387A (fr) |
DE (1) | DE69935700T2 (fr) |
ES (1) | ES2285853T3 (fr) |
FR (1) | FR2775640B1 (fr) |
WO (1) | WO1999045311A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001273804A (ja) * | 2000-03-28 | 2001-10-05 | Koito Mfg Co Ltd | 車両用灯具 |
JP3982225B2 (ja) * | 2001-10-05 | 2007-09-26 | 市光工業株式会社 | ヘッドランプ |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB469750A (en) * | 1934-10-29 | 1937-07-26 | Avery Julian Miles | Reflector apparatus and method of making same |
FR2460442A1 (fr) * | 1979-06-29 | 1981-01-23 | Cibie Projecteurs | Nouvelle structure de projecteur, notamment de projecteur d'automobile |
FR2536503B1 (fr) | 1982-11-19 | 1987-12-31 | Cibie Projecteurs | Projecteur antibrouillard pour vehicule automobile |
US4566056A (en) * | 1984-03-08 | 1986-01-21 | Stanley Electric Co., Ltd. | Headlamp for vehicle |
US5075828A (en) * | 1986-05-19 | 1991-12-24 | Musco Corporation | Glare control lamp and reflector assembly and method for glare control |
DE3525041C2 (de) | 1985-07-13 | 1994-06-16 | Bosch Gmbh Robert | Abblendlicht-oder Nebellichtscheinwerfer für Kraftfahrzeuge |
FR2602305B1 (fr) | 1986-08-04 | 1990-03-23 | Cibie Projecteurs | Projecteur antibrouillard a filament transversal pour vehicule automobile |
JPS6389601U (fr) * | 1986-11-29 | 1988-06-10 | ||
IT214875Z2 (it) * | 1988-11-22 | 1990-07-04 | Carello Spa | Proiettore per autoveicoli |
IT214874Z2 (it) * | 1988-11-22 | 1990-07-04 | Carello Spa | Proiettore per autoveicoli |
US4954938A (en) * | 1989-02-21 | 1990-09-04 | Whelen Technologies, Inc. | Light with wide angle radiation pattern |
JPH076564Y2 (ja) * | 1990-04-19 | 1995-02-15 | 株式会社小糸製作所 | 配光可変型自動車用前照灯 |
-
1998
- 1998-03-04 FR FR9802614A patent/FR2775640B1/fr not_active Expired - Lifetime
-
1999
- 1999-03-03 EP EP99937975A patent/EP1000294B1/fr not_active Revoked
- 1999-03-03 DE DE69935700T patent/DE69935700T2/de not_active Expired - Lifetime
- 1999-03-03 JP JP54433199A patent/JP2001523387A/ja not_active Ceased
- 1999-03-03 ES ES99937975T patent/ES2285853T3/es not_active Expired - Lifetime
- 1999-03-03 US US09/423,379 patent/US6543919B2/en not_active Expired - Lifetime
- 1999-03-03 WO PCT/FR1999/000471 patent/WO1999045311A1/fr active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9945311A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1000294B1 (fr) | 2007-04-04 |
FR2775640A1 (fr) | 1999-09-10 |
WO1999045311A1 (fr) | 1999-09-10 |
DE69935700T2 (de) | 2007-12-27 |
DE69935700D1 (de) | 2007-05-16 |
JP2001523387A (ja) | 2001-11-20 |
US20020024817A1 (en) | 2002-02-28 |
US6543919B2 (en) | 2003-04-08 |
ES2285853T3 (es) | 2007-11-16 |
FR2775640B1 (fr) | 2000-05-26 |
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