CN1293742A - Lighting or illuminating device especialy for motor vehicles - Google Patents

Abstract

The invention relates to a lighting or illuminating device, especially for motor vehicles, having a light source and a light exit surface or a light exit plane according to the generic part of Patent Claim 1. In a lighting or illuminating device of this type, the signal image function of the device is configured in a non-glare manner while retaining an optimal illumination of the roadway. To this end, the invention provides that the light exit plane is comprised of a middle area (10) which permits a part of the available light efficiency of the light source to pass through in a manner in which it is nearly unattenuated, and is comprised of an outer area (20) which encircles said middle area in a ring-shaped manner. Said outer area permits the available remaining part of the light efficiency to pass through in a manner in which it is slightly attenuated.

Description

Luminous or lighting equipment, especially for automobiles

The invention relates to a lighting or lighting device according to the preamble of claim 1, in particular for a motor vehicle, having a light source and a luminous surface or a luminous plane.

In lighting equipment especially for automobiles, it is basically divided into projection type and reflection type lighting equipment. The basic design of a reflective lighting device consists in that the light source is surrounded by a parabolic reflector at the foot of the light source. In front of the reflector, ie in the hemispherical region into which the light is reflected, there is a fixing device, which usually has a lens. In this case, the light should be output uniformly from the reflector region and directed to the lens system. A further known variant consists in providing a circumferential surface between the reflector and the lens for trapping scattered light. The basic principle here is that, in known headlights or lighting systems, the headlight projection lens collects all available light and is supposed to project it forwards. The light emitting surface or luminous surface or luminous plane is realized by the outer surface of the headlight lens.

The task of the vehicle headlights is, on the one hand, to ensure that the road is illuminated in the dark, especially in the direction of travel, and at the same time to illuminate the road for oncoming vehicles to show the signal scene of an approaching vehicle. For this dual purpose, a wide variety of headlight arrangements are known in the prior art, in which the focus is on concentrating light as best as possible. This has various disadvantages. On the one hand, in the dark, the area in front of the vehicle is well illuminated for the driver himself, but the light quantity or light energy used for the illumination is also the light quantity or light energy used for displaying the signal scene. As a result, headlights with good lighting performance often dazzle oncoming drivers.

Therefore, headlight arrangements for avoiding dazzle effects are known in the prior art.

DE 19625923A1 discloses a projection type automotive headlight. Wherein, the automobile headlight is composed of a reflector, a light source, a diaphragm and a lens arranged behind it. In this case, the luminous flux is adjusted by vertical and horizontal movement of the lens during its basic vertical and horizontal adjustment relative to the longitudinal axis of the headlight. In this case, the lens is mounted eccentrically to the longitudinal axis of the headlight and is arranged substantially rotatably about the longitudinal axis of the headlight. Wherein, the luminous flux distribution criterion is that generally, the headlight projects all the light to the front. Then, as is also attempted in other known systems, as much light as possible is emitted onto the roadway at a downward angle. Accordingly, people try to avoid the purpose of causing chords to motorists coming from the opposite side by avoiding the light cone accordingly.

DE 19715693 A1 discloses a vehicle headlight in which a shading device is arranged in the light path between the reflector and the lens, which shading or changing the light distribution. Wherein, the purpose to be achieved is to weaken the intensity of the light beam at the edge portion, in other words, to make the light beam diverge outwardly from the core portion.

However, since the shading element is located in the direct beam path, a not insignificant portion of the available core light and not a non-insignificant portion of the scattered light is shaded and no longer available for the pure lighting function.

DE 4102586 A1 discloses a headlight with a correction device for correcting the light distribution characteristic, wherein the light distribution characteristic is caused by the inclination of a body part relative to the road. For this purpose, covering devices are used which vary with the inclination of the vehicle or body parts. This structure is used on motorcycles. And when being used on motorcycle, also can't avoid the driver's eyes of the car coming on the opposite side.

European patent application EP 0623780A2 discloses a projection lens for automotive headlights. In order to generate a short-range light, the structure of the projection lens is that the convex radiation surface of the lens has different projection segments, wherein it is stipulated that a an upper section above the horizontal plane of the optical axis and a lower section below the horizontal plane, wherein at least two lower sections are provided, of which one lower section has an upper limit close to the side edge of the lens via the horizontal plane, or Provides for a continuously differently projected surface. Through this lens, the light beam is generally divided into arc segments. This just fans out the original light cone. With this lens, avoidance of dazzle effects is also not guaranteed.

Accordingly, starting from this problem, the object of the present invention is to provide a lighting or lighting device of the same type, in particular for motor vehicles, which makes the signal view of the device Function without dazzle effect.

According to the invention, in a luminous or lighting device, in particular for motor vehicles, according to the preamble of claim 1, the technical solution to the above object consists in that the luminous plane is formed by a device which allows the light output of the light source to be usable. A part of the middle part passes almost undiminished and an outer part surrounds the middle part, which allows the remaining part of the light output to pass through with only a reduced intensity.

Further, preferred embodiments of the invention are described in the dependent claims.

The essence of the invention is that the central part directs the majority of the available light for illuminating the driving road, preferably or in one embodiment also with a lens, onto the driving road, and uses the rest externally as The signal view is oriented towards the residual and/or scattered light of oncoming traffic. By using the diffused light fraction facing oncoming traffic via the outer annular surface, which is no longer reflected back into the main light cone, the intensity of this light fraction is attenuated so that no blinding effect occurs. That is to say, that part of the light emitted via the outer annular surface of the luminous plane represents only the signal view.

In order to attenuate the light fraction in the outer portion of the ring in a non-dazzling manner, the inner surface is attenuated or mirrored with a defined transmittance.

Overall, the entire available light output of the light source is utilized by the inventive design of the lighting device. In the central area, ie in the said center, in order to illuminate the road, for example by means of a lens, the main part of the light avoids oncoming traffic and is diverted to illuminate the road. Only the exterior is oriented towards the oncoming vehicle and only the remaining part of the light is used, the intensity of which can also be attenuated by the evaporation of the metal, as mentioned above.

Accordingly, the light of the light source is divided simply in such a way that, on the one hand, the driving surface is illuminated ideally and without blinding oncoming drivers and, on the other hand, the signal of the lighting system facing oncoming traffic The scene is attenuated without blinding effects.

In a preferred embodiment, the lighting device can be a reflective lighting device, whereby a reflector is arranged behind the light source.

Furthermore, the reflector can be positioned relative to the light source in such a way that the reflection of the core light is projected onto the middle of the luminous area and the remaining scattered light output is irradiated to the outside.

As previously mentioned, the central portion may be formed by a lens or may include a lens.

In a particularly preferred embodiment, the exterior is mirrored in such a way that said scattered light from the light source passes through it and no extraneous light passes through it.

The invention is shown in the drawings and described in detail below.

The accompanying drawings show:

Fig. 1 is a sectional view of the lighting device of the present invention,

Figure 2 Front view.

FIG. 1 shows a cross-sectional view of a headlight according to the invention. The headlight is arranged in a lamp housing 30 . Its main component is the lamp 1 which is arranged centrally in a reflector 2 . In this case, the light emitted by the lamp 1 is guided via the reflector 2 substantially to the lens 11 arranged in front of it. The lens 11 is arranged in the so-called middle part of the present invention of the entire light-emitting surface. Instead, the entire luminous area is realized by the entire cover 21 , as is carried out in the embodiments of the invention described below. Inside the lampshade 30, not only is the light reflected by the reflector 2 onto the lens 11 all available light, but there is also a so-called residual light in the lampshade 30, which from the reflector 2 is not directed to on the lens 11 , but diffusely scatters within the lampshade 30 . For this purpose, in the known lighting device, a cylindrical sleeve-shaped component is provided between the reflector and the lens, which component reflects the emitted light back into the beam path of the lens. The situation in the headlight according to the invention or in the lighting device according to the invention is another matter. The remaining light that appears to be stray, scattered within the light housing 30 and at least no longer directly focused by the lens 11 to the predetermined focal point should reach the partially mirrored annular surface 22 of the cover 21 in a completely conscious manner.

This means that the core light of the reflector 2 is projected onto the lens 11 , while the scattered light reaches the partially mirrored annular surface 22 . In this case, it is specified that the part is mirrored so that the residual light existing in the lampshade 30 can absolutely pass through the partly mirrored annular surface 22 . The partial mirroring of the annular surface 22 is understood here in such a way that residual light present in the light housing 30 can pass through said mirrored annular surface and its intensity is only slightly attenuated. To this extent, however, the mirroring described has a mirror effect in front view, ie looking from outside the lamp housing to the lamp housing or cover, whereby the inside of the lamp housing cannot be seen from outside the lamp housing.

The contour 23 of the cover 21 forms only a ring, either in which the lens 11 is inserted, or which contains a transition from the rest of the cover to the lens part. Moreover, the lens 11 can also be made together when the cover is made, and accordingly, the lens 11 and the cover 21 are integrally constructed. This means that the material of the inner part 10 of the cover 21 and its outer part 20 is inherently alternating.

FIG. 2 only schematically shows the arrangement of the lighting device in a mounting hole 40 . The mounting holes 40 may be located near the sides of the radiator, for example at the front of the vehicle. The demarcation between the central part 10 of the original cover 21 including the lens and the annular outer part 20 of the invention can be clearly seen in FIG. 2 . In this case, the ring-shaped outer portion 20 , ie the area between the two illustrated thick circular lines, is mirrored in the manner according to the invention. The effect of this is that the core light of the lamp which is projected onto the lens by the reflector 2 leaves the lampshade through the middle part 10 , ie through the lens arranged behind or in front of it. This light cone is used to illuminate the road surface and is aimed at the road surface, ie it is hidden from the field of view of oncoming drivers. Via the correspondingly mirrored annular surface 20 , the remaining light in the light housing is emitted to the outside in an attenuated manner. This means that an illuminated, shaded central circular surface and an outer circular surface illuminated with a second effective illumination intensity are produced for oncoming traffic. For oncoming traffic, the light cone leaving the middle 10 is obscured, but still recognizable as a much brighter circular surface. The outer ring is attenuated, so that, in general, a signal scene is created for oncoming traffic. That is to say, all the light is distributed accordingly, the middle part is only focused on the driving surface, that is, it is blocked, and for the oncoming traffic, the torus as a signal scene is weakened in light intensity face the oncoming traffic.

This achieves the described function of illuminating the driving surface with the core reflected light and forming a signal with the remaining light without glare.

Furthermore, it can be seen that crosspieces 11 are provided in the contour of the cover, these crosspieces 11 being used only for fixing the ring 23 shown in FIG. 1 for receiving the lens 11 . These crosspieces 11 are shown schematically and no further description is required.

Claims (6)

1. A lighting or lighting device, in particular for motor vehicles, having a light source and a luminous surface or a luminous plane, characterized in that the luminous plane is covered by a window through which a part of the available light output of the light source is hardly attenuated The central part (10) consists of an outer part (20) surrounding said central part, which allows the remainder of the available light output to pass through with reduced intensity. 2. Lighting or lighting device according to claim 1, characterized in that the lighting or lighting device is a reflective lighting or lighting device and a reflector (2) is arranged behind the light source. 3. Lighting or lighting device according to claim 2, characterized in that the reflector (2) is positioned relative to the light source such that the reflection of the core light is projectable onto the middle (10) of the luminous surface and the rest The "scattered light output" illuminates the exterior (21). 4. Lighting or lighting device according to one or more of the preceding claims, characterized in that the central part (10) has a lens (11) or consists of a lens (11). 5. Lighting or lighting device according to one or more of the preceding claims, characterized in that the exterior is so mirrored that said scattered light from the light source is transmitted through it and that no extraneous Light passes through the exterior. 6. Lighting or lighting device according to one or more of the preceding claims, characterized in that it is provided to divide the luminous surface or luminous plane into a central part (10) and an outer part (20) surrounding the central part (10) in a ring shape. ), so that the driving road is illuminated in a shaded manner in the middle, and a diverging, reduced intensity signal scene towards oncoming vehicles is produced on the outside.

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