EP0872687B1 - Vehicle headlamp - Google Patents

Description

The invention relates to a headlight for vehicles according to the preamble of the claim 1.

Due to the different legal regulations for the light distribution of Vehicle headlights and the difference between right-hand and left-hand traffic in So far it has been necessary in different countries for every one distributed worldwide Vehicle to build two different headlights.

From DE 43 07 109 A1 a headlamp with a reflector is known which Rotation of the reflector around its optical axis between left and right-hand traffic can be converted. A disadvantage of the known headlamp is that with rotation of the entire reflector, the light distribution on one side, the light / dark boundary falls below undesirably, so that the light distribution only for one type of traffic can be optimally aligned.

From DE 43 07 110 A1 a headlight with a reflector is known, the one Has symmetrical light distribution for right and left-hand traffic, with one side the light distribution by shielding a selected reflector area with the help a shielding device arranged between the reflector and the light source is hidden becomes. A disadvantage of this known headlight is that a reflector area cannot contribute to the light distribution for right-hand or left-hand traffic.

From DE 39 33 540 A1 a headlight with a reflector is known, in which by translational relative movement of the light source to the reflector of the headlights from a first operating position with a predetermined light distribution into a second operating position can be brought with a changed light distribution. The in the Light distribution provided in the first operating position can be advantageous in fog and Snowfall can be used. The light distribution assigned to the second operating position can be used advantageously in haze or rain. The light / dark boundary the light distribution remains unchanged.

The object of the present invention is to provide a headlight for vehicles with a Specify reflector that easily with a homogeneous light distribution a sharp light / dark boundary in different operating modes.

The object is achieved by the features of patent claim 1.

According to the invention are by changing the distance between the light source and at least two different types of light distributions can be generated for the reflector, the light distribution completely meets the lighting requirements satisfy. The invention is based on the idea that a translational Changing the relative position of the reflector and light source is the same as a new one Focussing position in the through a coordinated design of the free-form reflector another predetermined light distribution can be generated. The reflector is designed as an open space reflector, so that by a relative displacement of the Light source generates a second light distribution on the optical axis of the reflector can be. With simple adjustment means, the headlight can at least generate two different types of light distributions. According to the invention the headlight in a first operating position as a headlight with a light distribution used for right-hand traffic and in a second operating position, in the light source is closer to the hole in the reflector, to generate a light distribution for left-hand traffic. By being the focus point the light source for the respective operating positions is fixed, a simple settings can be made for the respective traffic types.

According to the invention, the reflector has a first reflector half, the first Sector for forming an asymmetrical increase in light distribution for right-hand traffic and a second sector to form an asymmetrical increase in light distribution for left-hand traffic. The pre-focusing, i.e. the change of the focal point in the direction of the reflector on the optical axis that the light distribution generated by the reflector half is rotated so that in each case an asymmetrical increase can be generated on the other side of a vertical.

According to a further development of the invention, the sector for the formation of the asymmetrical Rise for left-hand traffic in an upper area of the first reflector half arranged. This allows targeted control by a possibly the Headlight-covering optics pane are made, because the light rays reflected by the upper area of the reflector do not cross.

Further advantages of the invention result from the others Dependent claims.

A preferred embodiment of the invention is described below the drawing explained in more detail.

Figur 1:

einen Scheinwerfer im horizontalen Längsschnitt,

Figur 2a:

eine Aufteilung der linken Reflektorhälfte mit einer Mehrzahl von Teilflächen zur Erzeugung einer Lichtverteilung im Rechtsverkehr,

Figur 2b:

eine schematische Darstellung einer Lichtverteilung der durch die linke Reflektorhälfte nach Figur 2 a) erzeugten Lichtverteilung,

Figur 3a:

eine Aufteilung der linken Reflektorhälfte mit einer Mehrzahl von Teilflächen zur Erzeugung einer Lichtverteilung im Linksverkehr,

Figur 3b:

eine schematische Darstellung einer durch die linke Reflektorhälfte gemäß Figur 3a erzeugten Lichtverteilung im Linksverkehr,

Figur 4a:

eine Aufteilung der rechten Reflektorhälfte mit einer Mehrzahl von Teilflächen zur Erzeugung einer Lichtverteilung im Rechtsverkehr,

Figur 4b:

eine schematische Darstellung einer durch die rechte Reflektorhälfte nach Figur 4a erzeugte Lichtverteilung im Rechtsverkehr,

Figur 4c:

eine schematische Darstellung einer durch die rechte Reflektorhälfte nach Figur 4a erzeugten Lichtverteilung im Linksverkehr und

Figur 5:

eine Vorderansicht auf eine Optikscheibe für einen Scheinwerfer mit einer Lichtverteilung für Linksverkehr.

Show it:

Figure 1:

a headlamp in horizontal longitudinal section,

Figure 2a:

a division of the left reflector half with a plurality of partial areas to produce a light distribution in right-hand traffic,

Figure 2b:

2 shows a schematic representation of a light distribution of the light distribution generated by the left reflector half according to FIG. 2a),

Figure 3a:

a division of the left reflector half with a plurality of partial areas to produce a light distribution in left-hand traffic,

Figure 3b:

3 shows a schematic illustration of a light distribution in left-hand traffic generated by the left reflector half according to FIG. 3a,

Figure 4a:

a division of the right reflector half with a plurality of partial areas to produce a light distribution in right-hand traffic,

Figure 4b:

3 shows a schematic illustration of a light distribution in right-hand traffic generated by the right reflector half according to FIG. 4a,

Figure 4c:

a schematic representation of a light distribution generated by the right reflector half according to Figure 4a in left-hand traffic and

Figure 5:

a front view of an optical disc for a headlight with a light distribution for left-hand traffic.

Figure 1 shows a schematically illustrated headlight (1), which as Low beam headlights are used for motor vehicles. The headlight (1) has a reflector (2) in which a light source (3) is used. The Light source (3) can preferably be used as a halogen lamp, in particular as H7 lamp be formed. It can also be a suitable gas discharge lamp come into use. The reflector (2) has a central, coaxial to one optical axis (A) arranged bore (4), in the known per se The light source (3) is non-positively connected to the reflector (2). The The reflector (2) is arranged in a fixed position in a headlight housing (5) the light outlet opening of the headlight through a transparent Cover plate (6) made of glass or plastic is covered. The cover plate (6) can be designed as a clear cover plate with no scattering effect. Alternatively, the cover disc (6) can also be used as an optical disc with a scattering effect be executed. The reflector (2) is designed as an open space reflector consists of several sub-areas so that the light source (3) emitted light reflected as a bundle of light and a predetermined Light distribution on a vertically arranged in front of the vehicle Measuring screen (7) is generated.

By moving the light source (3) from an operating position in which one first light distribution is generated, along the optical axis (A) Path (Δs) the headlight (1) can be brought into an operating position in which one second light distribution can be generated. Depending on the setting of the The headlight (1) can thus be used to generate the operating position different light distributions can be used. For example by setting the light source (3) in a first operating position Light distribution for right-hand traffic and in a second operating position Light distribution for left-hand traffic can be generated. For the following described reflector (2), the path Δs is 2.5 mm. The reduction of Distance of the light source (3) from the bore (4) of the reflector (2) can for example by placing a ring on the lamp holder Light source (3) on the back of the reflector (2) can be set. By simple Mechanical adjustment means can thus be a when manufacturing the headlight (1) fixed operating position of the light source (3) can be set.

The following are the reflector divisions or the resulting ones resulting light distributions for a first operating position with a Light distribution for right-hand traffic and a second operating position with one Light distribution for left-hand traffic described with reference to Figures 2a to 4c. The Reflector (2) has a left reflector half (8) and a right reflector half (9), the partial surfaces of the left reflector half (8) being shaped in such a way that in the first operating position an asymmetrical increase to the right of the Vertical of the measuring screen (7) and in the second operating position asymmetrical rise to the left of the vertical (V) of the measuring screen (7) becomes. As can be seen from FIG. 2a and FIG. 2b, an upper region is created or an upper sector (10) a basic light distribution to the left of the vertical (V) below the horizontal light / dark boundary. Exemplary for the partial areas are the spiral images of the light source (3) at the reflector points a, b and c of sketched upper area (10) in the light distribution according to Figure 2b. On lower area (11) has a sector (12) which is asymmetrical 15 ° rise (13) to the right of the vertical (V). Examples of these are the Reflector points d and e are shown reflected spiral images, the upper one Pages set the light / dark limit. In the described Light distribution representations represent the dashed outline through the generated two reflector halves (8) and (9) in the respective operating mode Light distribution.

As can be seen from FIG. 3a and FIG. 3b, the upper region (10) produces in the second operating position the asymmetrical increase to the left of the vertical (V) and thus defines the light / dark boundary on the left. The lower Area (11) of the reflector half (8) contributes to the basic light distribution on the right Side of the vertical (V) at. Like the spiral images at the reflector points a ', b ', c', d 'and e' show the pre-focus, d. H. the reduction of Distance of the light source (3) from the bore (4) of the reflector (2) around given path Δs a light distribution that is clockwise around the optical axis (A) is twisted.

As is clear from FIGS. 4 a) and 4 b), in the operating position for Right-hand traffic an upper area (14) of the right reflector half (9) Basic light distribution on the right side of the vertical (V) at. A lower one Area (15) of the reflector half (9) generates light images along the Light / dark boundary (16) on the left side of the vertical (V). The Spiral images at the reflector points a ", b", c ", d" and e "illustrate that in contrast to the spiral images, which are shown by the left reflector half (8) are generated, starting from the spiral images of the right reflector half (9) from the upper region (14) of the reflector half (9) to the lower region (15) from a right edge of the light distribution towards a left Extend the edge of the same.

It can be seen from FIG. 4c in conjunction with FIG. 4b that in operation for Left-hand traffic the partial areas of the right reflector half (9) a horizontal Create light / dark boundary (17) to the right of the vertical (V). On the left a vertical light distribution is generated for the vertical (V). The light distribution of the right reflector half (9) in operation for right-hand traffic thus experiences one Rotation around the optical axis (A) counterclockwise to pass through Pre-focus to get into left-hand traffic.

Alternatively, the functions of the left reflector half (8) can be on the one hand and the right reflector half (9) on the other hand also replaced become. It is important that the partial surfaces of the reflector halves (8) and (9) so are formed that the course of the spiral images, starting from one upper part of a reflector half (8) or (9) to a lowermost Partial area of the same reflector halves, an opposite image from the left to the right or from right to left on the measuring screen (7).

FIG. 5 shows an embodiment of a cover disk (6) as an optical disk (20) depicting an area (21) with a special one on the top Area (10) of the left reflector half (8) has coordinated optics. For example, by additional training in accordance with the Asymmetrical rise-oriented prisms of the rise angle in operation be influenced when driving on the left. A scattering of this light beam through a light beam that is reflected at other reflector areas cannot enter. By providing an optical disc (20) for operation in Left-hand traffic of the headlight (1) can optimize the light distribution can be achieved.

Claims (7)

1. Headlamp for vehicles having a light source (3) and a reflector (2) which forms a light beam from the light emitted by the light source (3), said beam generating a predetermined light distribution with a light/dark border, whereby the reflector (2) is designed as an free-form reflector, such that a first predetermined light distribution may be set in a first operating position and that a second predetermined light distribution may be set through translational alteration of the relative position of the light source (3) to the reflector (2) from the first operating position into a second operating position, characterised in that in the first operating position the reflector (2) generates a light distribution for right-hand traffic and that, by reduction of the separation between the light source (3) and a bore (4) in the reflector (2) by a predetermined adjustment distance(s), the headlight (1) may be brought into the second operating position in which a light distribution for left-hand traffic is generated, whereby the reflector (2) has a first reflector half (8) which, on the one hand, has a first sector (12) for forming an asymmetrical increase in the light distribution for right-hand traffic and, on the other hand, a second sector (10) for forming an asymmetrical increase in the light distribution for left-hand traffic.
2. Headlamp according to Claim 1, characterised in that the second sector (10) is arranged in an upper region of the first reflector half (8).
3. Headlamp according to Claim 1 or 2, characterised in that the first reflector half (8) is designed as a left reflector half which, in the light emergence direction is arranged to the left of the vertical longitudinal plane of the reflector (2).
4. Headlamp according to one of the claims 1 to 3, characterised in that the partial surfaces of the left reflector half (8) are designed such that, starting from the upper region (10), spiral patterns are generated which extend from a left-hand edge of the light distribution to a right-hand edge of same.
5. Headlamp according to one of the claims 1 to 4, characterised in that the sector (12) for forming the asymmetrical increase in right-hand traffic is arranged in a lower region (11) of the left-hand reflector surface (8).
6. Headlamp according to one of the claims 1 to 5, characterised in that an opposing second reflector half is designed as the right reflector half (9) with partial surfaces such that in the first operating position, a light distribution with a horizontal light/dark border is generated to the left of the vertical and in the second operating position, a light distribution with a horizontal light/dark border is generated on the right side of the vertical.
7. Headlamp according to Claim 6, characterised in that the spiral patterns that are generated by the right-hand reflector half (9) starting from an upper region (14) and reaching to a lower region (15), extend in an opposing direction to the spiral patterns generated by the left-hand reflector half (8) starting from the upper region (10) and reaching to the lower region (11).

Images