JPH0467746B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a headlamp that is attached to a vehicle such as an automobile.

[Conventional Example] As this type of two-part reflecting mirror, one having a configuration disclosed in Japanese Utility Model Application Publication No. 118201/1983 filed by the same applicant is known. In this known reflecting mirror, the length relationship and arrangement of the traveling filament and the passing filament used are clearly established, and in particular, the traveling filament is 0.5 to 1.5 mm longer than the passing filament. It has been revealed that the traveling filament is located at a position perpendicular to the vertical line, and that the passing filament is swung on the central axis of the paraboloid or at a constant width. There is.

[Problems to be Solved by the Invention] In the conventional example, when trying to form a headlamp for right-hand traffic and left-hand traffic by locating the traveling filament perpendicularly to the vertical line, Another problem is that it is difficult to adjust the light distribution pattern so as not to dazzle the vehicle.

[Means for Solving the Problems] The present invention provides a traveling filament and a passing filament, such that the traveling filament has an angle range of 15 degrees vertically, horizontally, and horizontally with respect to the center axis of the paraboloid of the reflector. In a vehicle headlamp in which the passing filaments are arranged in an angle range of 2° vertically, horizontally, horizontally and incline including parallel, and the passing filaments are arranged above the traveling filaments, the reflector is arranged at the center of the paraboloid. The reflector is divided into the reflector and the lower reflector at or near the axis, and both reflectors are formed with different focal positions, and the interval between the two focal positions is set to be equal to or longer than the length of the passing filament, A filament for passing is placed between the two focal points of the paraboloid above the center axis of the paraboloid and shifted in the left and right directions from the center axis, and a filament for passing is placed below the center axis and on the opposite side of the filament for passing across the center axis. A traveling filament is disposed, and the traveling filament has an angle θ formed by a line parallel to a vertical cross section on the center axis of the paraboloid of the reflector and passing through the passing filament, with the center of the passing filament as the apex. To provide a headlamp for a vehicle characterized by being positioned within a range of up to 60°, the irradiated light can be directed so as to correspond to either right-hand traffic or left-hand traffic, and the headlamp is arranged within a range of up to 60°. This improves the luminosity.

[Examples] Next, the present invention will be explained in more detail with reference to illustrated embodiments. The ones shown in FIGS. 1 to 5 are for left-hand traffic, and 1 indicates the entire reflector. can be seen from the front divided into vertical and horizontal lines by a vertical line V passing through the center line X of the paraboloid and a horizontal line H. ), the reflector 1 is divided into upper and lower parts to form an upper reflector 2 and a lower reflector 3, and these reflectors have their focal points f1,
The position of f2 is different. That is, the upper reflector 2 is formed as a paraboloid of revolution reflector with a focal length F1 of 15 to 40 mm, and the lower reflector 3 is formed as a paraboloid of revolution with a focal length F2 of 15 to 40 mm. It is. The rotation center axes of both reflecting mirrors are on the same axis, that is, the reflecting mirror center axis X, and a predetermined distance d1 (3 to 3
The focal point f2 is placed at a distance of 15 mm). However, the distance between these focal points is set to be longer than the length of a filament for passing, which will be described later.

The passing filament 4 is disposed above the central axis X and slightly shifted to the left in the figure. In other words, it is located between two focal points, d2 (0 to 6 mm) behind the focal point f2, and d above the central axis
6 (0 to 2 mm), and is arranged so as to be laterally shifted within a range of d5 (0 to 2 mm). The passing filament 4 is tilted vertically or horizontally within a range of 2° from its center as a starting point. The other traveling filament 5 is disposed below the central axis X and on the right side in the figure. In other words, the running filament 5 is placed at a position where its center is approximately parallel to the central axis 2-2
mm) and below d4 (1.5 to 3.5 mm), and further shifted by an angle θ (0 to 60°) from the center of the passing filament 4. That is, it is located within the range of an angle θ formed with the center of the passing filament 4 as the vertex from a line segment V' that is parallel to the vertical line V and passing through the passing filament. Set the angle θ to (0~
60°) because when θ exceeds 60°, the gap between the passing filament and the running filament becomes small, and the feeling of switching between the running beam and the passing beam disappears.

In the above-mentioned arrangement, the state of reflection between the passing filament 4 and the running filament 5 in the reflecting mirror is shown in FIGS. 4-5, and the spot light pattern is shown in FIGS. 6-7. In the figure, the running filament 5 is placed on the vertical line V, d2=0.5,
This is the case where d3=2, d4=2.3, d5=0, d6=0.5, and the filament lengths are all 4 mm.

First, to describe the pattern of the filament 4 for passing each other, as shown in FIG. deviation angle α
1, and a deviation angle α2 of the angle of incidence with respect to the upper reflector up to the front end of the filament, which causes a fan-shaped expansion in the range of angles α1 to α2 below the horizontal line H, as shown in FIG. 6A. This results in a rough spot pattern 2a. Also, in the lower reflector 3, since the passing filament 4 is located behind the focal point f2, there is an incident angle deviation α3 from the focal point f2 to the front end of the filament, and an incident angle deviation α3 from the focal point f2 to the rear end of the filament. Because of α4, a spot pattern 3a is formed below the horizontal line H that spreads in a fan shape within the range of angles α3 to α4. Note that both spot patterns overlap as the same pattern. In particular, when the passing filament is on the vertical line V, the pattern shown in FIG. 6A is used, and when the passing filament is on the left side of the vertical line V as shown in FIG. The pattern will be as shown. In any case, the spot pattern of the filament for passing is d1, d2, F
By setting 1 and F2 to arbitrary dimensions, the angle of incidence on the reflector can be changed to create a desired light distribution pattern.

Next, to explain the light distribution pattern of the traveling filament 5, as shown in FIG. Therefore, the reflection situation with respect to the upper reflector 2 has an incident angle deviation β1 from the focal point f1 to the rear end of the running filament, and an incident angle deviation β2 to the reflector from the front end of the running filament. The light distribution pattern 2b spreads out in a fan shape from the top to the bottom in the range of angles β1 to β2, which is the same as or larger than the pattern of the passing filament.
In addition, in the lower reflector 3, there is an incident angle deviation β3 from the focal point f2 to the front end of the running filament to the reflector, and an incident angle deviation β4 to the reflector from the rear end of the running filament. As shown in FIG. 6B, the center position β5 of the hot zone is displaced along the vertical line on and above the horizontal line H, forming a deformed circular pattern 3b. When the running filament is moved forward or backward as shown in FIG. 1, the light distribution pattern as shown in FIG. 7B is obtained.

Further, FIGS. 8 and 9 show the light distribution pattern with the running filament disposed in a different position together with the light distribution pattern of the passing filament. The light distribution pattern of the passing filament is shown as is in FIG. 7B. The arrangement position in the traveling filament 5, that is, d3
When the dimension of is set to 1 to 2 mm (or -1 to 2 mm), the fan shape of the reflection pattern on the upper reflector 2 becomes larger,
The reflection pattern becomes approximately circular, and a light distribution pattern as shown in FIG. 8 is obtained. or,
The light distribution pattern when the running filament is slightly shifted to the right as shown in FIG. 1 is as shown in FIG. 9. In this case, the reflected light reflected by the upper and lower reflectors is generally shifted to the right by a range of β6, and the reflected light reflected by the lower reflector 3 is
The shape becomes slightly distorted, and the upward reflection of light is restricted. In forming such a pattern, the hot zone β5 is determined by the interval between the deviation angle θ and d4, and the moving distance β6 thereof is determined by the deviation angle θ. In addition, for right-hand traffic, the passing filament 4 is located on the right side of the upper reflector 2, and the traveling filament 5 is located on the left side of the lower reflector 3, and their positional relationship is the same as described above.

[Function] The light distribution pattern emitted from the headlamp with the above configuration is shown in FIGS. 10 to 13. In the figure, 11 is a hot zone, 12 is a running beam, 13 is a passing beam, and 14 is a road surface. In Fig. 10, it is shown that the irradiation positions of the traveling beam 12 and the passing beam 13 are shifted vertically as shown by the arrow a depending on the deviation angle θ, and also on the road surface by the distance d3. As shown by arrow b, the irradiation positions of the traveling beam 12 and the passing beam 13 are shifted back and forth. In this figure, the deviation angle θ
The beam angle is within 30 degrees, the switching between the driving beam and the passing beam is large, and although the front of the road is dark, there is a lot of light above, making it suitable for motorcycles. In addition, the case where d3 is set to 1 to 2 mm is shown in FIG. 11, where both the running beam 12 and the passing beam 13 have a light distribution pattern that illuminates from a relatively close distance, and the hot zone 11 of the running beam has a light distribution pattern that illuminates far away. The hot zone of the passing beam will be illuminated with a considerable spread,
In particular, the driving beam illuminates nearby areas as brightly as the passing beam. Further, FIG. 12 shows the case where d3 is set to 0 to 1 mm. In this case, the running beam 12 will be directed slightly upward, and the irradiation position will be moved slightly forward of the irradiation position of the passing beam 13, allowing the illumination light to reach far away, resulting in a light distribution pattern with a sense of switching. be. Furthermore, FIG. 13 shows a case where the deviation angle θ is 30 to 60 degrees. The light distribution pattern in this figure is such that the top of the traveling beam 12 is flat;
The hot zone is also lower, the switching angle between the driving beam and the passing beam is smaller, and the front of the road is also brighter, but it still brightly illuminates distant areas, and moreover, it efficiently illuminates distant areas over a wide area. Because it provides illumination, it is suitable as a headlamp for automobiles.

When installing such a headlamp on a vehicle, it is possible to change the switching angle and light distribution between the driving beam and the passing beam at any angle by swinging it to an arbitrary deviation angle θ depending on the mounting height of the vehicle and the required light distribution. It is possible to set it to . In addition, in order to improve the light distribution of the passing beam, by shifting the passing filament 4 laterally by an interval of d5, the traveling beam approaches the focal point, and the passing beam can be moved without changing the road surface light distribution. The beam hot zone increases. Furthermore, by shifting the passing filament upward by d6, the running beam approaches the focal point, and the hot zone of the running beam can be increased without changing the road surface light distribution pattern of the passing beam. The above embodiments all relate to headlamps for left-hand traffic; however, if the headlamps are for right-hand traffic, they may be symmetrical with those of the previous embodiments.

[Effects of the Invention] As explained above, in the vehicle headlamp according to the present invention, the parabolic reflector is divided into an upper reflector and a lower reflector at or near the center axis of the paraboloid. Because it was formed with a different focus position,
Compared to the H4 bulb, the passing beam can use a total reflection surface, which doubles the amount of light from the reflector, and if the illumination light is the same as the H4 bulb, the filament's wattage can be halved, resulting in significant energy savings. This has an excellent effect.

Further, the interval between the two focal points is set to be equal to or longer than the length of the filament for passing each other, and between the two focal points, the two filaments are disposed on the left and right across the vertical line and vertically across the central axis, and The filament is positioned in front of the passing filament, and the running filament is parallel to the vertical line and passes through the passing filament within a maximum range of 60° at an angle θ formed by a line that passes through the passing filament, with the center of the passing filament as the apex. Because it is located within the center, in conjunction with the configuration of the parabolic reflector, it is possible to set the light distribution pattern of the driving beam and the passing beam as desired, and it does not emit glare light to the oncoming lane. It also has the excellent effect of brightly illuminating the side to a greater distance.

Furthermore, the parabolic reflector is divided into upper and lower parts,
By specifying the lengths of both filaments and arbitrarily selecting their arrangement, an excellent effect can be achieved in that a headlamp with light distribution characteristics suitable for the type of vehicle to which it is installed can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view of a headlamp according to an embodiment of the present invention with the front lens removed;
The figure is a cross-sectional view taken along the line ~ in Figure 1, Figure 3 is a cross-sectional view taken along the ~ line in Figure 1, and Figure 4 is a schematic cross-sectional view showing the arrangement position of the passing filament.
Fig. 5 is a schematic cross-sectional view showing the arrangement position of the running filament, and Figs. 6A, B to 9A, B show the arrangement positions of the passing filament and the running filament, respectively. Light distribution pattern diagram for the case,
FIGS. 10 to 13 are schematic diagrams showing the light distribution state on the road surface when the arrangement positions of the passing filament and the traveling filament are changed, respectively. 1... Reflector, 2... Upper reflector, 3... Lower reflector, 4... Filament for passing, 5... Filament for traveling, f
1, f2...focal point, F1, F2... focal length, θ
... Displacement angle, d1 to d6 ... Interval (distance), α
1~α4, β1~β4...Angle, 2a, 2b, 3
a, 3b...Spot pattern, V, V'...Vertical line, X...Central axis, H...Horizontal line.

Claims (1)

[Scope of Claims] 1. The traveling filament and the passing filament are arranged such that the traveling filament has an angle range of 15° vertically and horizontally with respect to the center axis of the paraboloid of the reflector, and the passing filament In a vehicle headlamp that is arranged in an angle range of 2° vertically and horizontally, including parallel, and in which the passing filament is arranged above the traveling filament, the reflector is located at or near the central axis of the paraboloid. It is divided into an upper reflector and a lower reflector, and these reflectors are formed with different focal positions, and the interval between the two focal positions is set to be equal to or longer than the length of the passing filament,
A filament for passing is arranged between the two focal points of the paraboloid above the central axis of the paraboloid and shifted in the left and right directions from the central axis, and a filament for passing is placed below the central axis and on the opposite side of the filament for passing across the central axis. A traveling filament is disposed, and the traveling filament has an angle θ formed by a line parallel to a vertical cross section on the center axis of the paraboloid of the reflector and passing through the passing filament, with the center of the passing filament as the apex. A vehicle headlamp characterized by being positioned within a maximum angle of 60°.