JP2000106007A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce high illuminance distribution for low beam and also realize a high beam function. SOLUTION: A reflecting mirror 10 has a segment-like first range 31a arranged horizontally on the left side and the right side of an optical axis 11 as viewed from the direction opposite to a light beam. The first range 31a reflects light projected from a light source 12 within a central range of illuminance distribution produced by a headlight, and forms a brightness boundary 7 line. The reflecting mirror 10 also has a second range 32 arranged on the upper side of the first range 31a. The second range 32 widely and equally diffuses and reflects light projected from the light source 12 on the lower side of the brightness boundary line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head for a vehicle having a reflector, a light source, in particular a gas discharge lamp, and a translucent glass plate arranged in the path of the beam reflected from the reflector. A light beam emitted from the headlight has an asymmetrical light / dark boundary line, which is composed of a section on the opposite lane side and a section on the traveling lane side, and the traveling lane side of the light / dark boundary line. Section relates at least in part to a type that is located higher than the section on the opposite lane side.

[0002]

2. Description of the Related Art Such headlights are, for example, DE 196
10 904 A1. This low-beam headlight has a reflector, a light source, and a translucent glass plate disposed in the path of the beam reflected from the reflector, and the beam emitted from the headlight has an asymmetric light-dark boundary. The light / dark boundary line includes a section on the opposite lane side and a section on the traveling lane side, and the section on the traveling lane side of the light / dark boundary line is at least partially positioned higher than the section on the opposite lane side. are doing.

[0003] More recently, gas discharge lamps have been used as light sources in addition to halogen incandescent lamps. Gas discharge lamps have significantly higher illumination than incandescent lamps. Further, instead of a diffused glass plate having an optical profile, headlights having a colorless and transparent glass plate have become desired by automobile manufacturers. In these headlights, the reflector must produce a light distribution for the high beam or the low beam, including the light / dark boundary, by appropriately configuring the reflecting surface.

[0004] In known reflectors of this type, the uniformity of the light distribution and the spread of the light distribution are not satisfactory. When using a gas discharge lamp of the D2R type in such a headlight, additional difficulties arise due to the fact that the luminous body, unlike the cylindrical coil of a halogen lamp, is bent and the boundaries are not sharp. . For this reason, gas discharge lamps of the D2R type have additional, tightly pressed shades on their outer bulb, which aid in the formation of light-dark boundaries, similar to H4 type lamps.

Gas discharge lamps also have the disadvantage that metal halide deposits are formed in the lower part of the lamp. This metal halide deposit, on the one hand, is not available in most reflective systems, and therefore reflects light into the lower reflector area, which must be shielded, and on the other, the deposit. Light diffuses and / or reflects off objects to produce dazzling light above light-dark boundaries.

[0006] DE 43 02 907 A1 describes an automotive headlight having a discharge bulb as a light source,
In this headlight, the light which may dazzle the driver of the vehicle in the oncoming lane is reduced so that objects in the upper part of the road surface can be seen better. For this purpose, the reflecting surface of the reflector is divided into a lower reflecting surface and an upper reflecting surface, with the lower reflecting surface being roughly half the lower section, which is the metal halide of the bulb. The upper reflective surface is roughly half the upper section and receives the undiffused light flux. The lower reflecting surface is a right reflecting surface which is a half of the right side,
It is divided into a left reflecting surface, which is a section on the left half. The right and left reflecting surfaces are tilted by a predetermined angle, so that the reflected light beam is tilted to the left and right accordingly. The diffuser lens step is configured in the area of the lower half of the front lens that covers the front opening of the reflector, with this area of the front lens receiving light from the right and left reflecting surfaces. Allow to pass.

A disadvantage of this headlight is that it requires a diffuser lens step, ie a diffuser glass plate with optical elements, to produce the desired low beam. It is not possible with this headlight to produce a low beam with a clear glass plate.

[0008] In the headlights for high and low beams described in DE 44 35 507 A1,
The light source and the reflector are pivotable relative to each other to provide a high beam function.

[0009]

The object of the present invention is to improve a headlight for a vehicle of the type mentioned at the outset by using a colorless and transparent glass plate without changing the predetermined dimensions of the reflector. In this way, the light distribution and the side illumination are good, the homogeneity is improved, and the illuminance distribution for the low beam with an acceptable glare is produced, and the high beam function is also possible. That is.

[0010]

According to the present invention, there is provided, in accordance with the present invention, at least a substantially segment in which a reflector is disposed at least approximately horizontally on the left and right sides of the optical axis when viewed in a direction opposite to the direction of the rays. A first area which reflects light projected from the light source into a central area of the illuminance distribution produced by the headlights, forming a light-dark boundary, and further comprising: The reflector has a second area disposed above and in contact with the first area, the second area directing light projected from the light source below the light-dark boundary. And diffused and uniformly diffused to reflect.

[0011]

The reflector is divided into two ranges, the first range being arranged horizontally on the left and right sides of the optical axis in the direction of the light rays, in a segmented manner, and in the second range. Are located above the first area, so that on one side a bright central area of the illuminance distribution having a significant part of the light-dark boundary and on the other side below the light-dark boundary A wide and homogeneous diffusion is achieved, without the detrimental reflection from the metal halide deposits of the gas discharge lamp having a detrimental effect on the light distribution.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention;

[0013] For example, advantageously, the first segment-shaped area of the reflector is inclined approximately 15 ° with respect to the horizontal line and / or the horizontal line, when viewed in a direction opposite to the direction of the light rays. Extend symmetrically about the line.

In another advantageous embodiment, the first of the reflectors is
Is extended asymmetrically with respect to a substantially horizontal line and / or a line inclined at approximately 15 ° to the horizontal line. In both cases, convergence in the central region of the illumination distribution is achieved with sufficiently high illumination.

[0015] In this case, in the case of a mirror whose path of light rays is reversed, ie a mirror whose light rays intersect, advantageously the first part of the first area is opposite to the direction of the light rays. Extends along a horizontal line to the left of the optical axis when viewed in the direction, while the second portion of the first range is horizontal to the right of the optical axis when viewed in the opposite direction to the direction of the light rays. Extend along a line which is inclined downward by approximately 15 ° to the line.

Conversely, in a reflector in which the directions of the rays are not reversed, that is, a reflector in which the rays do not intersect, the first portion of the first range has a direction opposite to the direction of the rays. The second part of the first range extends horizontally along a line substantially horizontal to the right of the optical axis when viewed, while a horizontal line Extend along a line that is inclined upward by approximately 15 ° with respect to.

In another advantageous embodiment, the first area is defined by a substantially horizontal line on the upper side and a lower line on both sides of the optical axis on the opposite side when viewed in a direction opposite to the direction of the rays. It is separated by a line that slopes downward at an angle to it.

This angle is preferably approximately 22 °, which approximately corresponds to the angular arrangement of the shade of a gas discharge lamp (D2R type lamp) with a shade known per se. Furthermore, the first area can have a large surface and a large segment angle, so that the light projected from the light source can be covered by a covering element, which is advantageously arranged directly on the light shade. .

This covering element is, in an advantageous embodiment, a projection of the direct light shade.

In order to produce a high-beam function in a headlight with a gas discharge lamp, in an advantageous embodiment the position of the light source relative to the reflector is swiveled and / or vertical. Variable by swiveling, by arranging the gas discharge lamp at a position for the high beam, the first and second ranges of the reflector allow the light projected from the gas discharge lamp to be reflected as a high beam. It has become.

In another advantageous embodiment, the light source is pivotable about the longitudinal axis of the light source with respect to the reflector,
A partial area of the first area is illuminated to provide a high beam function.

In yet another embodiment, a plurality of shades are provided below the light source, the shades being axially and / or vertically relative to the reflector to produce a high beam function. It can slide.

In order to cause relative movement between the light source and the reflecting mirror, the light source can be slid relative to the reflecting mirror, or the reflecting mirror can be slid or swiveled relative to the light source. Is also possible.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be specifically described below based on embodiments shown in the drawings.

The headlights for vehicles, particularly motor vehicles, shown in FIGS. 1 to 6 and 11 have a reflector 10 in which a light source 12 is mounted in the region of the apex.
The reflector 10 can be made of a thin metal plate or plastic. A gas discharge lamp is used as the light source 12, and its luminous body 14, that is, the arc, extends substantially parallel to the optical axis 11 of the reflecting mirror 10.

The reflecting mirror 10 has a horizontal plane 16 including the optical axis 11 and an inclined plane 18 inclined with respect to the horizontal plane. The light source 12, or gas discharge lamp, is generally located at the center of the reflector 10. Arc 1
Underneath 4 is a metal halide deposit 15 which produces an unwanted reflection of the light projected from the arc 14 and reflected by the reflector 10. The gas discharge lamp 12 has shades 20, 21 in its lower area, with the shades 21
Is disposed below the shade 20. The shades 20, 21 are formed by a non-translucent coating layer of the glass bulb of the gas discharge lamp 12. This assists in the formation of an asymmetric low beam similar to that of known headlights as defined in Europe.

A shield 24 is provided in the lower area of the gas discharge lamp 12, so that the lower area of the reflecting mirror 10 is illuminated by the light emitted by the gas discharge lamp 12. On the other hand, it is shielded.

The reflecting mirror 10 has a first segment-shaped area 3.
1a and 31b, and these first ranges are arranged substantially horizontally on the left and right sides of the optical axis 11 when viewed in a direction opposite to the direction of the light rays. Furthermore, the reflector 10 has a second area 32 which is in contact with the first area and which is arranged above the first area when viewed in a direction opposite to the direction of the light rays. Have been. The reflecting surfaces of the first range 31a, 31b and the second range 32 can be continuous or divided into a plurality of partial surfaces, in which case the shape of the reflecting surface is determined by a numerical value. Can be kept. The transition between the first area 31a, 31b and the second area 32 can take place continuously, but it is also possible for the transition to have folds or steps. As can be seen from FIG. 1, a portion 31a of the first range 31a, 31b is a substantially horizontal line 1 on the left side of the optical axis 11 when viewed in a direction opposite to the direction of the light beam.
6, while the second part 31b of the first area 31a, 31b is located on the right side of the optical axis 11 when viewed in a direction opposite to the direction of the ray, with respect to a horizontal line. And extends symmetrically about a line 18 which is inclined downward by approximately 15 °.

Such a reflecting mirror 10 is used in the case where the paths of the light beams are reversed, that is, when the light beams intersect. In the same way, both parts 31 of the first range
The arrangement of a and 31b can be interchanged. In the case not shown, the part 31b symmetrically arranged with respect to the line 18 which is inclined upward by approximately 15 ° with respect to the horizontal line has the optical axis 11 as viewed in the direction opposite to the direction of the light beam. In contrast, the portion 31a extending symmetrically with respect to the horizontal line 16 is located on the right side of the optical axis 11 when viewed in a direction opposite to the direction of light rays. This arrangement is used in reflectors where the directions of the rays are not reversed, ie the rays do not intersect.

The reflector 10 shown in FIG. 1 produces the illuminance distribution shown in FIGS. FIG. 7 shows an equal illuminance line 81 generated by the light reflected by the first ranges 31a and 31b of the reflecting mirror. As can be seen from FIG. 7, the light reflected by the first areas 31a, 31b forms a central part of the illuminance distribution with a light-dark border consisting of a horizontal section 70 and an upwardly inclined section 70 '. This results in an asymmetric illumination of the measuring surface 60 (FIG. 11) or the road surface.

On the other hand, the second area 32 of the reflecting mirror 10
The light reflected by this produces, as can be seen from the iso-illuminance line 82 in FIG. 8, a uniform and wide illumination of the measuring surface or the road surface below the light-dark boundaries 70, 70 '.

When the light reflected by both areas of the reflector 10 is superimposed, the illuminance distribution shown in FIG. 9 on the measurement surface or the traveling road surface is generated. Isoluminance line 8 in FIG. 9
As can be seen from FIG. 3, on one side the measuring surface and the road surface are uniformly and widely illuminated below the light-dark boundaries 70, 70 ',
On the other side, sharp light-dark boundary lines 70 and 70 'occur. In this case, in particular, the reflections produced by the metal halide deposit 15 of the gas discharge lamp do not interfere. Such reflections, for example, can give glare to oncoming vehicles as an obstacle. Such reflection hardly occurs when the reflecting mirror 10 is configured as described above.

In the alternative embodiment shown in FIG. 2, the illuminance distribution shown in FIGS. 7 to 9 is produced, but the configuration of the reflector 10 'is different. In the reflector 10 ', the first areas 31'a and 31'b are viewed in the direction opposite to the direction of the light rays, and the upper side is defined by a horizontal line 35a.
The lower side is separated by a line 35b that is inclined downward with respect to a horizontal line on both sides of the optical axis 11. Second
Range 32 'is located above the horizontal line 35a.

The angle of the line 35b with respect to the horizontal line is advantageously approximately 22 °.

Further, in the embodiment shown in FIG. 3, the first areas 31 "a and 31" b are configured in a segmented manner with a larger segment angle than in the embodiment of the reflector 10 of FIG. First range 31 "a, 31" b
Has a larger surface than the areas 31a and 31b of FIG. 1, whereas the second area 32 ″ is in this case segmented with a smaller surface than FIG. 1. In this embodiment, The cover element 92 is, for example, as shown in FIG.
And in FIG. 3, the first area 31 ″ a,
The region indicated by reference numeral 90 of 31 ″ b is the gas discharge lamp 12
From the light projected from the The illumination distribution shown in FIGS. 7 to 9 also results from the reflector 10 ″ shown in FIG. 3. The covering element 92 can be configured, for example, as a projection of the light shade 94 directly.

FIGS. 4, 5 and 6 show FIGS.
In the embodiment of the reflectors 10, 10 ', 10 "described in connection with Figures 9 to 9, there is shown a structure for producing a high beam function.
For example, when using a D2 lamp known per se which does not have a tightly pressed shade, the shades 50, 51 mounted on the outside of the lamp, i.e. the formation of a light-dark border during low beam operation. Shade 5 to assist
The 0, 51 are moved outwardly from the ray path by moving the adjusting members, for example, rearward or downward in the axial direction. This structure of the reflector is shown in FIG. In this format, the first ranges 31a, 31b, 31'a, 31 '
b, 31 "a, 31" b is illuminated, and the light reflected by this partial range is
The area above 0,70 'is illuminated, producing a sharp maximum illumination.

When using a D2R type gas discharge lamp known per se having crimped shades 20, 21,
The gas discharge lamp can also be pivoted about a longitudinal axis of the lamp relative to the reflector to enable a high beam function, in which case the lamp shades 20, 21 are in low beam operation. Shades 20, 21
The first areas 31a, 31b,
Subrange 4 of 31'a, 31'b, 31 "a, 31" b
0 is illuminated again and arranged to reflect the high beam as described above. This structure of the reflector is shown in FIG.

Further, when using the D2R type gas discharge lamp 12, the gas discharge lamp is relatively
Alternatively, the reflector can be slid axially and horizontally by an adjusting member relative to the gas discharge lamp. In low beam operation, the gas discharge lamp 1
2 are arranged as described in FIGS.
First ranges 31a, 31 of the reflecting mirrors 10, 10 ', 10 "
b, 31'a, 31'b, 31 "a, 31" b reflect the light projected by the gas discharge lamp 12 and produce the illuminance distribution of FIGS.

In low beam operation, the gas discharge lamp 12
Are arranged as shown by solid lines in FIG.

In high beam operation, the gas discharge lamp 12
Is different from the reflector, in particular, as shown by the dashed line in FIG. 4, is located closer to the vertex of the reflector and moved downward, so that the light projected from the gas discharge lamp Are reflecting mirrors 10, 10 ', 10 "
Of the first ranges 31a, 31b, 31'a, 31'b, 3
1 "a, 31" b, which are reflected by another characteristic.
Illumination distribution as shown in FIG. This structure of the headlight is shown in FIG.

In FIG. 10, the illuminance distribution indicated by the equal illuminance line 87 corresponds to the first range 31a, 31b or 31'a, 31'b or 31 "a, 31" b and its partial range 40 and the second range 31a, 31'b or 31 "a, 31" b. Range 32 or 32 '
Or by light reflected from the 32 ". As can be seen from FIG. 10, the cone of light is slid slightly upwards,
Along with the centrally located convergence range, a range is created which produces a wide light diffusion which is also particularly advantageous in the high-beam function and thus a wide illumination of the road surface.

The possibility of achieving the high beam function described with reference to FIGS.
0, 10 ', 10 ". Gas discharge lamp 12 or shades 50, 5
The aforementioned movement of 1 can be performed in any of the embodiments of the reflector shown in FIGS.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a reflector for a headlight for an automobile according to the present invention.

FIG. 2 is a view showing a second embodiment of the reflector of the headlight for an automobile according to the present invention.

FIG. 3 is a view showing a third embodiment of a reflector for a headlight for an automobile according to the present invention.

FIG. 4 is a schematic vertical longitudinal sectional view of a first embodiment of a reflector in which the light source is shifted relative to the reflector to produce a high beam function.

FIG. 5 shows a second embodiment of the reflector in which the light source is rotated relative to the reflector to produce a high beam function.
It is the schematic of an Example.

FIG. 6 is a schematic diagram of a third embodiment of the reflector in which the shade is shifted relative to the reflector to produce a high beam function.

FIG. 7 shows a measurement surface arranged in front of a headlight, having the same line of illumination produced by light rays reflected from a first area of the reflector in low-beam operation.

FIG. 8 shows a measuring surface with lines of the same illuminance caused by the light rays reflected by the second area of the reflector of the low-beam headlight according to the invention.

FIG. 9 shows a measuring surface having the same line of illumination caused by the light rays reflected by the first and second areas of the reflector of the low-beam headlight according to the invention.

FIG. 10 shows the same illuminance produced by a reflected light beam when the light source is shifted relative to the reflector by the reflector of the low-beam headlight according to the invention to produce a high-beam function. FIG. 4 is a diagram showing a measurement surface having a line.

FIG. 11 is a simplified schematic diagram of a low beam headlight having a gas discharge lamp.

[Explanation of symbols]

10, 10 ', 10 "reflecting mirror, 11 optical axis, 12
Light source, gas discharge lamp, 14 luminous body, arc,
15 sediment of metal halide, 16 horizontal plane,
Horizontal line, 18 inclined plane, inclined line, 2
0,21 shade, 24 shield, 31a, 3
1'a, 31 "a, 31b, 31'b, 31" b 1st
32, 32 ', 32 "second range, 35
a, 35b line, 40 sub-ranges, 50, 51 shades, 60 measurement planes, 70 (horizontal border) horizontal section, 70 '(upward slope section) (8)
1, 82, 83, 87 isometric lines, 90 areas, 9
2 Cover element, 94 direct light shade

Claims (14)

[Claims] 1. A reflector (10; 10 ';10''), a light source (12), in particular a gas discharge lamp, and a reflector (10; 1).
0 '; 10 "), for a vehicle having a transmissive glass plate disposed in the path of the beam reflected from the headlight; 70, 70 '), and the light / dark boundary line comprises a section (70) on the opposite lane side and a section (70') on the traveling lane side, and a section (70 ') on the traveling lane side of the light / dark boundary line. ) Are at least partially higher than the oncoming lane side section (70),
A first region, at least approximately segmented, arranged at least approximately horizontally, on the left and right sides of the optical axis (11) when the reflector (10; 10 '; 10 ") is viewed in a direction opposite to the direction of the light rays; (31a, 31b; 31'a, 31'b; 3
1 "a, 31" b), this first area reflecting light projected from the light source (12) into the central area of the illuminance distribution produced by the headlights, and (70, 70 '), and the reflecting mirror further comprises a first region (31a, 31b; 31'a, 31'b; 31 "a, 3).
A second area (32; 32 '; 32 ") located above 1" b) and adjoining the first area, the second area being projected from the light source (12). A headlight for a vehicle, characterized in that light is diffused and uniformly diffused and reflected below a light-dark boundary (70, 70 '). 2. The first of the reflecting mirrors (10; 10 '; 10 ").
(31a, 31b; 31'a, 31'b; 31 ")
a, 31 "b) extending substantially symmetrically with respect to a substantially horizontal line (16) and / or a line (18) inclined at approximately 15 [deg.] with respect to the horizontal line. The described headlight. 3. The first of the reflecting mirrors (10; 10 '; 10 ").
(31a, 31b; 31'a, 31'b; 31 ")
a, 31''b) extending substantially asymmetrically with respect to a substantially horizontal line (16) and / or a line (18) inclined at approximately 15 ° to the horizontal line.
The described headlight. 4. A first portion (31a) of the first range (31a, 31b) forms a substantially horizontal line (16) on the left side of the optical axis (11) when viewed in a direction opposite to the direction of the light beam. While the second portion (31b) of the first area (31a, 31b) forms a horizontal line on the right side of the optical axis (11) when viewed in a direction opposite to the direction of the light beam. 4. The headlight according to claim 2, wherein the headlight extends along a line (18) which is inclined by approximately 15 [deg.]. 5. The first portion (31a) of the first range (31a, 31b) forms a substantially horizontal line (16) on the right side of the optical axis (11) when viewed in a direction opposite to the direction of the light beam. While the second portion (31b) of the first area (31a, 31b) forms a horizontal line on the left side of the optical axis (11) when viewed in a direction opposite to the direction of the light beam. 4. The headlight according to claim 2, wherein the headlight extends along a line (18) which is inclined by approximately 15 [deg.]. 6. A horizontal line (35a) in which the first area (31'a, 31'b) has an upper side as viewed in a direction opposite to the direction of the light ray.
And the lower side is delimited on both sides of the optical axis (11) by a line (35b) inclined downward at an angle to a horizontal line (35a). The described headlight. 7. An angle between 20 ° and 25 °, preferably approximately 2 °.
7. The headlight according to claim 6, wherein the angle is 2 [deg.]. 8. A cover in which a first area (31 "a, 31" b) is arranged on at least one, preferably a direct light shade (94), for light projected from a light source (12). 4. The headlight according to claim 1, wherein the headlight is covered by an element. 9. The headlight according to claim 8, wherein the covering element (92) is a projection of the direct light shade (94). 10. The position of the light source (12) relative to the reflector is variable in the axial and / or vertical direction, and the first area (31a, 3 ′) of the reflector (10; 10 ′; 10 ″).
1b; 31'a, 31'b; 31 "a, 31" b) and the second range (32; 32 '; 32 ") so that the light projected from the light source (12) is reflected as a high beam. The headlight according to any one of claims 1 to 9, characterized in that: 11. A light source (12) comprising a reflector (10; 1).
11. The headlight according to claim 10, wherein the headlight is movable with respect to 0 '; 10 ") by an adjusting element. 12. The headlight according to claim 10, wherein the reflector is movable with respect to the light source by an adjusting element. 13. A light source (12) comprising a shade (20, 2).
1), is rotatable with respect to the reflector (10; 10 '; 10 "), and has a first range (31a, 31b; 31'a, 3
1'b; 31 "a, 31" b), characterized in that, during low-beam operation, a partial area (40) covered by the shade (20, 21) is illuminated. 10. The headlight according to any one of 9 to 9. 14. A shade (5) outside a light source (12).
0,51), which shades can be slid axially and / or vertically relative to the reflector (10; 10 '; 10 ") to produce a high beam function. For the first range (31a, 31b;
31'a, 31'b; 31 "a, 31" b), wherein during the low beam operation, the partial area (40) covered by the shade (50, 51) is irradiated. The headlight according to any one of claims 1 to 9.