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EP1020681A2 - Projecteur à angle d'émission de lumière variable à lentille antérieure asphérique - Google Patents

Projecteur à angle d'émission de lumière variable à lentille antérieure asphérique Download PDF

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Publication number
EP1020681A2
EP1020681A2 EP99124750A EP99124750A EP1020681A2 EP 1020681 A2 EP1020681 A2 EP 1020681A2 EP 99124750 A EP99124750 A EP 99124750A EP 99124750 A EP99124750 A EP 99124750A EP 1020681 A2 EP1020681 A2 EP 1020681A2
Authority
EP
European Patent Office
Prior art keywords
lens
headlight
headlight according
light source
section
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
Application number
EP99124750A
Other languages
German (de)
English (en)
Other versions
EP1020681A3 (fr
EP1020681B1 (fr
Inventor
Dedo Weigert
Depu Chin
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.)
Dedo Weigert Film GmbH
Original Assignee
Dedo Weigert Film GmbH
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 Dedo Weigert Film GmbH filed Critical Dedo Weigert Film GmbH
Publication of EP1020681A2 publication Critical patent/EP1020681A2/fr
Publication of EP1020681A3 publication Critical patent/EP1020681A3/fr
Application granted granted Critical
Publication of EP1020681B1 publication Critical patent/EP1020681B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors

Definitions

  • the invention relates to a headlamp with variable Beam angle at which the change in the beam angle differently than by shading the beam path by means of an aperture or mask is evoked, with one inside the headlight arranged light source and a first lens, which is the front lens of the headlamp.
  • a headlamp with variable Beam angle at which the change in the beam angle differently than by shading the beam path by means of an aperture or mask is evoked with one inside the headlight arranged light source and a first lens, which is the front lens of the headlamp.
  • This class of Headlights do not belong to profile projectors where one slight change in the beam angle as a side effect occurs when the image is sharpened.
  • the headlights known from the prior art with Variable beam angle can be divided into three classes divide, namely step lens headlights, headlights with very deep reflector and headlights with relative to Front lens movable optical unit from a second Lens, a light source and a reflector.
  • step lens headlights have a single one Step lens (Fresnel lens) on.
  • Step lens Fresnel lens
  • incandescent lamps halogen lamps or discharge lamps are used.
  • the light source and a Reflectors are on a sled at a fixed distance from each other assembled.
  • the sled is relative to the Fresnel lens movable.
  • the focus is done by moving the Sledge.
  • step lens headlights results however, for focusing settings with a small beam angle a significant effective loss of light. Because no second lens is present that focuses the light towards the Fresnel lens, becomes a large part of the focusing settings mentioned of the light emitted by the light source simply by the Housing inner wall absorbs, leading to loss of light and too useless housing heating leads.
  • Headlights with a very deep reflector are common constructed so that lamp and reflector are relative to each other can be moved, but the lamp is always within of the reflector remains on its optical axis. By changing the position of the lamp within the reflector becomes the beam angle of such a headlamp changed. However, the focus path that can be achieved is low, so that the beam angle is only within relatively narrow limits can be varied.
  • Such headlights provide one high luminous efficacy, but one in almost all lamp positions unfavorable light distribution.
  • causes of this in general bad light distribution is that for everyone such headlights each have a predetermined reflector shape with regard to the resulting light distribution only on each a single lamp position can be optimally coordinated. Result from focusing movements of the lamp or the reflector uneven light distributions.
  • headlights are known from US-A-4 823 243 and EP-A-0 846 913. They have a light source, one assigned to the light source Reflector, in the direction of radiation of the light source-reflector combination first converging lens arranged in the beam path (Front lens) and one in the beam path between the Light source and the first converging lens arranged second Converging lens on.
  • the reflector, the light source and the second A condenser lens is longitudinal than one relative to the first condenser lens movable optical axis of the headlamp Unit assembled.
  • the distance between the light source and the second converging lens changeable are also customary very similar headlights, but with the mutual Distances between the reflector, the light source and the second converging lens cannot be changed. Both the latter headlights can only be used as an optical unit rigid whole to be moved.
  • the headlight known from EP-A-0 846 913 within the optical that can be moved relative to the first converging lens Unit both the distance between the light source and the second converging lens, as well as the distance between the Change the light source and the reflector. All in this paragraph However, headlights described have in common that the Front lens is a spherical lens.
  • the headlights mentioned in the previous paragraph with variable beam angle provides a wide range of change of the beam angle (see Fig. 6a, 6b) and have one high efficiency of the illuminance achieved in relation to the energy required to operate the headlamp. Further they offer an extremely even light distribution.
  • these headlights are traditional Concept of defined scattered light (light intensity ⁇ 50% of the maximum light intensity) due to the steep flanks of the Light intensity at the edge of the illuminated area is not more available.
  • Fig. 6a, 6b points the illuminance characteristic of an illuminated field marginally small increases in intensity, their size depends on the position of the optical unit, however the Light intensity over the entire illuminated area in the essentially constant.
  • the intensity increases on the edge do not occur in the spot position. They only appear on the movement of the headlight out of the spot position and then increase in size continuously until a critical Beam angle setting between spot position and Flood position is reached in which the size of the intensity increases is maximum at the edge. With further movement of the The headlight increases towards the flood position Size of the intensity increases on the edge again continuously from.
  • a surface of the second lens is provided with a Graining such that a microlens structure on the grained Surface arises, so in the illuminance characteristic moderate increases in intensity occurring at the edge however, they do not completely disappear. Besides, will the reduction in intensity increases at the edge bought through increased scattering effects and loss of light.
  • the invention has for its object a generic Provide headlights that compared to the Such headlights known from the prior art a more even light distribution, especially in the beam angle settings outside the spot position, delivers.
  • an aspherical lens as the first lens, thus guaranteed as a front lens of the generic headlamp one compared to that of the prior art known such headlights more uniform light distribution outside the spot position.
  • aspherical lenses means Lenses in which at least one partial surface is not spherical is executed, with plan areas here always being the spherical areas.
  • aspherical Lentils are lenses with an ellipsoid and a spherical one Surface and lenses with a spherical surface and a hyperbolic surface.
  • Fresnel lenses with aspherical designed partial areas are aspherical lenses in the sense of definition above.
  • the grain according to claim 15 needs in the invention Headlights not to run as deep as the grain usually known from the prior art the second lens. In this way there is less Loss of light and, importantly in the spot position, one higher light intensity with the same power input.
  • a particularly uniform light distribution is obtained in the embodiments of the headlight according to the invention according to claims 8, 11, 22 and 25.
  • the headlamp according to the invention according to claim 28 in relation to claim 27 ensures that the headlamp also has all the benefits of the the headlights known from EP-A-0 846 913, in particular the very large variability of the beam angle and the light intensity, having.
  • FIG. 1a an embodiment of the headlamp according to the invention is shown in cross section.
  • the headlamp has a cup-like, opaque housing 1, into which a first converging lens 2 is inserted on the light exit side as the front lens of the headlamp.
  • the surface of the first converging lens 2 facing in the direction of radiation of the headlamp is rotationally symmetrical and has the shape of a hyperbolic section in the meridional section, the apex of the hyperbola lying on the optical axis of the headlamp.
  • the hyperbola satisfies the following equation: Z.
  • the surface of the first facing the headlight Collecting lens 2 is a flat surface. However, it can also be concave be executed curved. This applies in principle to everyone in the following described embodiments of the invention Headlights.
  • the housing 1 Within the housing 1 are on a slide 3 Light source 4 by a small filament lamp Helix is formed, and one assigned to the light source 4 Reflector 5 arranged. The light source 4 and the reflector 5 are mounted so that the resulting light beam path in Direction of the first converging lens 2 is directed. Besides, is on the slide 3 in the beam path between the light source 4 and the first condenser lens 2 is arranged a second condenser lens 6.
  • the second converging lens 6 is a meniscus lens, whose facing the first converging lens 2 Surface is grained.
  • the second converging lens 6 is rotationally symmetrical with respect to its optical axis.
  • the grained surface of the second converging lens 6 facing away from the light source 4 has the shape of a hyperbolic section in the meridional section, the apex of the hyperbola lying on the optical axis of the headlight.
  • the light source 4, the reflector 5 and the second converging lens 6 are mounted so that both the distance between the Light source 4 and the second converging lens 6 as well Distance between the light source 4 and the reflector 5 changed can be.
  • the first converging lens 2 it is also possible to use the first converging lens 2 to provide a lens surface with a grain, so that a Microlens structure is created. This measure will achieved particularly good uniformity of light distribution.
  • Fig. 1a shows the light source 4, the reflector 5 and the second converging lens 6 in a position of maximum radiation angle of the headlight according to the invention.
  • the distance between the first converging lens 2 and the second converging lens 6 as well the distance between the second converging lens 6 and the light source 4 are minimal according to the headlight dimensions, and the distance between the light source 4 and the reflector 5 is the maximum according to the installation conditions Distance.
  • the slide 3 moved in the direction away from the first converging lens 2.
  • the mechanics of the sled and cooperates with it Guide parts designed so that the second converging lens 6 initially remains in its original position and itself only the light source 4 and the reflector 5 while maintaining their original mutual distance in the direction of move the first converging lens 2 away. That kind of movement lasts until the distance between the light source 4 and the second converging lens 6 reaches a predetermined value
  • Has. 1b shows the optical system of the invention Headlights in this position.
  • the reflector 5 reaches one accordingly the headlight dimensions extreme distance from the first Converging lens 2 and stops moving (see Fig. 1d). This is the position in which the one from US-A-4 823 243 known headlights its minimal beam angle and reaches its maximum illuminance.
  • the headlight On the way from the starting position shown in Fig. 1a passes through to the position shown in Fig. 1d the headlight has a critical beam angle setting, in which the headlight known from US-A-4 823 243 brighter illuminated in its light distribution characteristic Shows edges (see Fig. 6a, 6b).
  • the invention Headlights with the aspherical front lens 2 shows however in all beam angle settings, in particular also in the beam angle setting critical according to the prior art, a very uniform light distribution characteristic. Such is with reference to FIGS. 7a and 7b using a another embodiment of the headlight according to the invention explained in more detail below.
  • the mechanical mobility of its individual parts forth corresponds to the invention shown in Figs. 1a to le Headlamp that shown in EP-A-0 846 913 Headlights. That is, it is possible to start from the in Fig. 1d shown headlight position, the light source and the second converging lens 6 while maintaining it mutual distance with the reflector stationary 5 even further away from the first converging lens 2 and thus bring closer to the reflector 5 (see Fig. 1e).
  • FIGS. 2a to 2e A further exemplary embodiment of the headlight according to the invention is shown in FIGS. 2a to 2e.
  • the surface of the first converging lens 2 directed in the direction of radiation of the headlamp is rotationally symmetrical with respect to its optical axis, and the surface of the first converging lens 2 directed into the headlamp is a flat surface.
  • the difference from the embodiment of the headlight according to the invention shown in FIGS the optical axis of the headlamp.
  • the second converging lens 6 is also a meniscus lens.
  • the surface of the second converging lens 6 facing away from the light source 4 is rotationally symmetrical with respect to its optical axis and has the shape of an ellipse section in the meridional section, the small axis of the ellipse lying on the optical axis of the headlight.
  • the second Converging lens 6 in the rear section of the locomotion Carriage 3 of the first converging lens 2 not suddenly stand, but it is at constant relative speed between the light source 4 and the first converging lens 2
  • Relative speed between the second converging lens 6 and the first converging lens 2 is continuously slowed down until the second condenser lens 6 then finally stops while the reflector 5 and the light source 4 while maintaining their mutual distance from the first converging lens 2 move on (Fig. 3a to 3e).
  • the Reflector 5 the extreme position shown in Fig. 3e, and only the light source 4 still moves from the first converging lens 2 away until the light source 4 finally reaches its outermost position Has reached position (Fig. 3f). The reversal of this movement takes place accordingly.
  • the second converging lens 6 is designed as a meniscus lens, the surface of which facing away from the light source 4 has the shape of a hyperbolic section in the meridional section, the apex of the hyperbola lying on the optical axis of the pig launcher.
  • Fig. 7a are illuminance characteristics for the in 3a to 3f illustrated embodiment of the invention Headlight shown.
  • the in Fig. 6a illustrated illuminance characteristics after State of the art is the improved uniformity of the Illumination by means of the headlight according to the invention clear.
  • the state of the art outside of the spot position Intensity increases occurring at the edge are also in the previously critical beam angle setting between Spot position and flood position disappeared.
  • a direct one Provide comparison for the critical beam angle setting 6b and 7b.
  • a first converging lens 2 with a hyperbolic surface facing away from the light source 4 in the meridional section can e.g. B. can also be combined with a second converging lens 6, whose surface facing away from the light source 4 has the shape of an elliptical section in the meridional section.
  • FIGS. 4a to 4c Such an embodiment of the headlamp according to the invention is shown in FIGS. 4a to 4c.
  • the surface of the first converging lens 2 facing in the radiation direction of the headlight is rotationally symmetrical in this exemplary embodiment and has the shape of a hyperbolic section in the meridional section, the apex of the hyperbola lying on the optical axis of the headlight.
  • the surface of the first facing the headlight Collecting lens 2 is a flat surface.
  • the second converging lens 6 is rotationally symmetrical with respect to its optical axis.
  • the grained surface of the second converging lens 6 facing away from the light source 4 has the shape of an elliptical section in the meridional section, the apex of the ellipse lying on the optical axis of the headlight.
  • Fig. 4a shows the light source 4, the reflector 5 and the second converging lens 6 in a position of maximum beam angle of the headlamp.
  • the slide 3 moved in the direction away from the first converging lens 2.
  • Headlights the mechanics of the sled and interacting with it Guide parts designed so that the distances the second converging lens 6, the light source 4 and the reflector 5 do not change with each other at first.
  • carriage 3 a certain distance from the second Has reached converging lens 2, holds the second converging lens 6 in their movement while the light source 4 and the Reflector 5 while maintaining their mutual distance together even further from the first converging lens 2 and now also move away from the second converging lens 6 until it is hers the greatest possible design distance from the first Reach converging lens 2 (see Fig. 4c).
  • the second converging lens 6 is also not necessarily a meniscus lens or must be designed as an aspherical lens.
  • the headlight is the inward surface of the first converging lens 2 aspherical.
  • the carriage system not necessarily as in US-A-4 823 243 or in EP-A-0 846 913 described.
  • the carriage system not necessarily as in US-A-4 823 243 or in EP-A-0 846 913 described.
  • the distance between reflector 5, light source 4 and second converging lens 6 cannot be changed.
  • as aspherical Front lens 2 uses a rotationally symmetrical lens reached.
  • the corresponding lenses arranged offset to the optical axis of the headlamp are. This applies to the first converging lens 2 as well for the second converging lens 6.
  • the reflector 5 is always a relatively flat reflector and the light source 4 as an upright standing filament lamp shown. However, it is also possible a deep reflector and / or a lying one Lamp to use.
  • the light source 4 e.g. also by a Halogen lamp or by using a discharge lamp without filament Light spot are formed between two electrodes.
  • the aspherical front lens can be rotationally symmetrical or not rotationally symmetrical as well as on the optical Axis of the headlamp centered or to the optical The axis of the pig thrower must be offset.
  • the conic section constants r and k still many other values accept.
  • the invention does not apply to headlights of a particular one Performance class limited. For example, you can according to the invention Headlights both as miniature headlights a power of some 10 W as well as high-performance headlights with a power of some 10 kW.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP99124750A 1999-01-15 1999-12-13 Projecteur à angle d'émission de lumière variable à lentille antérieure asphérique Expired - Lifetime EP1020681B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19901391 1999-01-15
DE19901391A DE19901391A1 (de) 1999-01-15 1999-01-15 Scheinwerfer mit veränderlichem Abstrahlwinkel und mit asphärischer Frontlinse

Publications (3)

Publication Number Publication Date
EP1020681A2 true EP1020681A2 (fr) 2000-07-19
EP1020681A3 EP1020681A3 (fr) 2001-10-10
EP1020681B1 EP1020681B1 (fr) 2007-05-30

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Application Number Title Priority Date Filing Date
EP99124750A Expired - Lifetime EP1020681B1 (fr) 1999-01-15 1999-12-13 Projecteur à angle d'émission de lumière variable à lentille antérieure asphérique

Country Status (4)

Country Link
US (1) US6499862B1 (fr)
EP (1) EP1020681B1 (fr)
CN (1) CN1122773C (fr)
DE (2) DE19901391A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP1610055A1 (fr) 2004-06-23 2005-12-28 Dedo Weigert Film GmbH Projecteur focalisable avec distribution de lumière dissymétrique
CN103453341A (zh) * 2012-05-31 2013-12-18 海洋王照明科技股份有限公司 灯具

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US8075162B2 (en) * 2008-09-12 2011-12-13 Light Prescriptions Innovators, Llc Zoom luminaire with compact non-imaging lens-mirror optics
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CN101761869B (zh) * 2010-01-27 2012-02-08 海洋王照明科技股份有限公司 一种均匀配光透镜及其led灯具
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DE102010054922B4 (de) * 2010-12-17 2025-01-16 Volkswagen Ag Scheinwerfer für ein Fahrzeug mit einer Halbleiterlichtquelle
CN103851524B (zh) * 2014-03-12 2015-12-16 广州市浩洋电子有限公司 一种具有图案及光束效果的舞台灯光学系统
US10406967B2 (en) * 2014-04-29 2019-09-10 Chia Ming Chen Light control systems and methods
US20160169475A1 (en) * 2014-11-19 2016-06-16 Production Resource Group, Llc User Adjustable LED Lighting Luminaire and Accessories
CN110906264B (zh) * 2019-12-11 2020-11-24 东阳市聚铕新材料有限公司 一种聚光震荡式led灯塔
DE102020133588A1 (de) * 2020-12-15 2022-06-15 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Scheinwerfer
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Publication number Priority date Publication date Assignee Title
EP1610055A1 (fr) 2004-06-23 2005-12-28 Dedo Weigert Film GmbH Projecteur focalisable avec distribution de lumière dissymétrique
CN103453341A (zh) * 2012-05-31 2013-12-18 海洋王照明科技股份有限公司 灯具
CN103453341B (zh) * 2012-05-31 2017-07-25 海洋王照明科技股份有限公司 灯具

Also Published As

Publication number Publication date
DE19901391A1 (de) 2000-09-14
EP1020681A3 (fr) 2001-10-10
CN1261136A (zh) 2000-07-26
EP1020681B1 (fr) 2007-05-30
DE59914358D1 (de) 2007-07-12
US6499862B1 (en) 2002-12-31
CN1122773C (zh) 2003-10-01

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