JPS62122002A - Head lamp for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (NI4 Wakageki L /l) $+I El l\
1) The present invention provides a headlamp for a vehicle that prevents uneven light distribution of a running beam when the vehicle is running at night, and that improves illumination resistance as much as possible within a predetermined size range. It is about lights.

[Conventional technology]

When driving at night, it is common for vehicles to turn on their headlights, but during such driving, passing beams are used to prevent the drivers of oncoming vehicles from being dazzled by the light from the headlights. The running beam for running is appropriately switched. A conventional example of a headlamp capable of switching between a running beam and a passing beam is shown in FIGS. 4 and 5. This headlight includes a reflector 6 having a paraboloid of rotation,
It consists of a bulb 7 placed approximately at the center of the reflecting mirror 6 and a lens 5 covering the front surface of the reflecting tia 6.

While a double filament is adopted for valve 7,
The reflecting mirror 6 and the lens 5 are positioned along the main axes of the lens 5, which are arranged to coincide with each other. Of the filaments used in this bulb, the traveling beam filament 2 is reflective m
The beam emitted therefrom hits the paraboloid of rotation of the reflecting mirror 6 and becomes parallel light beams, forming the traveling beam 3. On the other hand, the filament 1 for the low beam is arranged slightly in front of the reflecting mirror 6 from the filament 2 for the traveling beam, and the light emitted therefrom is reflected by the paraboloid of revolution of the reflecting mirror 6 and A passing beam 4 is formed toward the main axis. Since the running beam 3 needs to reach a long distance as a parallel light beam, a light shielding plate 11 is provided in front of the running beam filament 2 to prevent the light from the running beam filament 2 from directly passing through the lens 5. is shielded by. This light shielding plate 11
Also, it prevents the light from the passing beam filament l from directly passing through the lens 5, and also causes one reflection! At a6, the front and bottom of the passing beam filament l is shielded to prevent light from crossing the principal axis and going upward after reflection. This is because if the passing beam 4 goes upward, it will dazzle the driver of an oncoming vehicle.

In a double filament type headlamp having such a structure, a single reflecting mirror 6 and lens 5 must be used to irradiate the running beam 3 and the passing beam 4.

Therefore, especially regarding the passing beam 4, the lens 5 refracts the passing beam 4 in a certain direction to prevent this beam from illuminating the driver of an oncoming vehicle and to ensure long-distance visibility when passing each other. For example, in the lens 5 shown in FIG. 4, the areas designated by symbols A and B, called the hot zone irradiation part, are specially cut in some areas of the entire surface for irradiation, as shown in FIG. 6. A sawtooth-shaped lens force is applied to the hot zone irradiation parts A and B so that the passing beams 4 that pass through the hot zone irradiation parts A and B are refracted to the left (right in the figure) with respect to the direction of travel of the vehicle. ing. In addition, in the area designated by the symbol C, which is called the wide magnification zone, among the five lens surfaces, a lens cut is applied to the waveform as shown in Fig. 7, so that the traveling beam 3 or the diffused light is transmitted through this area. .

[Problem that the invention attempts to solve]

However, in such a conventional vehicle headlamp, as is clear from FIG. 5, the light emitted from the low beam filament l is blocked from traveling downward by the light blocking plate 11. Since only the light directed upward is reflected by the upper half of the reflector 6 and becomes a passing beam, the reflector 6
Although it has the shape of a paraboloid of revolution that expands in the vertical direction with respect to the valve 7, there is a problem in that this reflection #tJ,6 is not effectively utilized when vehicles pass each other.

Furthermore, the lens cut is made so that when the lens 5 or the passing beam filament 1 is turned on, the light distribution characteristics of the passing beam 4 are shown as shown in FIG. 2 is turned on, it is affected by the cutting in the hot zone irradiation parts A and B, creating a hot zone D as shown in FIG. 9, resulting in uneven light. Therefore, with the conventional double-filament headlights mentioned above, it is difficult for 1M drivers to see objects illuminated by the headlights, and uneven road illumination can cause eye flickering. Problems were often present. Another problem was that it was difficult to adjust the optical axis of the headlights because the unevenness of the light resulted in some bright areas.

(Means for Solving the Problems) In the present invention, means for solving the above problems include a pair of reflecting mirrors each having a reflecting surface in the shape of a paraboloid of revolution, and one of the two reflecting mirrors. A light source installed inside the reflecting mirror and emitting a passing beam; a light shielding means for shielding the front and lower sides of this light source; and a light source installed inside the other of the reflecting mirrors and emitting a traveling beam. In a vehicle headlamp comprising a light source and a lens attached to cover the front surface of each reflector, the reflector provided with the light source that emits the above-mentioned passing beam is configured so that the light irradiated from the above-mentioned light source is At least a portion of the portion that is shaded by the light shielding means is removed, and the axis of the light source is offset downward with respect to the lens center position.

[Effect]

In the present invention, since the part of the reflective surface that emits a passing beam that blocks the light irradiated from the light source and becomes a shadow, that is, the part below the axis of the light emitter, is cut out, when this reflective surface is viewed from the front. In this case, it becomes a paraboloid of revolution with a roughly semicircular opening with a cutout in the lower part. The light source body, such as a filament in a bulb or shield type, is arranged so as to substantially coincide with the central axis of rotation of the paraboloid of revolution. Therefore, since the passing beam is reflected from almost the entire reflecting surface and passes through the lens, it is possible to effectively utilize the reflecting surface, which increases the degree of freedom in designing the vehicle body at the mounting part of the headlight, and also allows the passing beam to pass through the lens. The bulbs, reflective surfaces, and lens cuts that generate each of the traveling beams can be individually designed to obtain the most suitable light distribution characteristics.

〔Example〕

The following is a drawing of an example of a vehicle headlight related to Unreleased II. 11-Explain based on.

1 to 3 show embodiments of a vehicle headlamp according to the present invention. The vehicle headlights according to this embodiment are provided in pairs on the left and right sides of the front of the vehicle, and each headlight includes a housing 8, a reflector 6 housed in the housing 8,
It consists of a bulb 17.27 supported by a reflector, and a lens 5 attached to the housing 8 so as to cover the reflector 116 and the front surface of the bulb 17.27. The reflecting mirror 6 has a reflecting surface 2° for a passing beam formed into a paraboloid of rotation, and a reflecting surface 21 for a traveling beam provided at a position slightly apart from the reflecting surface 2°. The passing bulb 17 is provided with a light shielding plate as a light shielding means, or the bulb itself is subjected to a light shielding treatment. This reflecting mirror 6 can be made by sheet metal processing or by molding a synthetic resin material, but since the reflecting surfaces 20 and 21 are paraboloids of revolution, In order to ensure the accuracy of the paraboloid, it is preferable that it be made of synthetic resin.

The housing 8 has holes 18 and 19 for inserting and removing the valve.
On the other hand, holes 22 and 23 are provided in the recesses of the reflective surfaces 20 and 21 for mounting the bulbs, respectively, and in these mounting holes 22 and 23 there are a passing beam bulb 17 and a light source, respectively. The traveling beam bulb 27 is inserted and attached. Similarly to the reflecting surface 16, the reflecting surface 20.21 also corresponds to a portion where the light emitted from the light source of the reflecting surface is blocked by the light blocking means and becomes a shadow, that is, the central axis of rotation of the paraboloid of revolution. A predetermined range of the light source axis, that is, a portion below the bulb center E is removed, and the bulb center E is offset downward with respect to the lens center F.

Passing beam bulb 17 and traveling beam bulb 2
7 is a halogen bulb that adopts single filament formation because it is only necessary to emit only the passing beam 4 or the running beam 3 respectively -M Jiff B:I
Jr 4+12'w Th/
” M H/ II j M!!
! , l+ The 11-beam bulb 17, as shown in FIG.
The light emitted from there is reflected by the passing beam reflecting surface 20, and then
Head towards the main axis. Therefore, in order to prevent the light emitted from the low beam bulb 17 from directly passing through the lens 5 or irradiating the lower half of the low beam reflecting surface 20, the low beam bulb 17 is partially Light shielding plate 1
The bulb itself may be covered with a light-shielding treatment, or the bulb itself may be covered with a light-shielding treatment.

On the other hand, the traveling beam bulb 27 has a traveling beam reflecting surface 21 similar to the traveling beam filament 2 in the conventional example.
The light emitted therefrom is reflected by the traveling beam reflecting surface 21, and then becomes a parallel beam of light and illuminates the front. Since the driving beam 3 needs to illuminate the front of the vehicle as brightly as possible, most of the light from the driving beam bulb 27 is used for forward illumination. The passing beam 4 and the traveling beam 3 reflected by the respective reflecting surfaces 20.21 are reflected by the respective reflecting surfaces 20.21.
It passes through the lens 5 in an area corresponding to 21. Therefore, a passing beam lens cut section 15 and a traveling beam lens cut section 25 are provided independently in the corresponding areas of the lens 5. Among these, the lens cut part 15 for the passing beam is cut to bring the passing beam 4 toward the front lower side of the vehicle, while the lens cut part 25 for the running beam is cut to diffuse the running beam. has been done. When the two bulbs 17 and 27 are turned on at the same time, the passing beam lens cut section 15 and the traveling beam lens cut section 25 are used to compensate for the shortage of each light beam (illumination light) that has passed through the lens cut section Is, 25. are adjusted to complement each other.

In a vehicle headlamp with such a configuration, the low beam bulb 17 is turned on and the driving beam bulb 27 is turned on.
Consider the case where the light is turned off. At this time, the front of the vehicle is illuminated only by the low beam 4 reflected by the low beam reflecting surface 20, so the illumination light is directed toward the front left of the vehicle by the action of the low beam lens cut part 15, about approximately Illuminates the road surface with an inclination angle of 15 degrees. When the headlight switch is switched for illumination during driving in this state, the low beam bulb remains lit and the driving beam bulb 27 also lights up. Valve 27 for traveling beam
After being reflected by the traveling beam reflecting surface 21, the light emitted from the traveling beam becomes a parallel beam and passes through the traveling beam lens cut section 2.
It falls under 5.

This running beam lens cut section 25 is cut so as to compensate for the lack of light distribution of the passing beam 4 transmitted through the passing beam lens cut section 15.
The respective light beams 3 and 4 that have passed through both lens cut portions 15° 25 are combined to exhibit uniform light distribution characteristics with no uneven illumination. The results of comparison with the optical characteristics are shown in a tabular form in FIG. As is clear from this figure, there is no big difference between the conventional headlight and the headlight of the present invention in the light distribution characteristics during passing lighting, but when comparing the light distribution characteristics during driving lighting, the conventional It can be seen that while the headlight causes uneven illumination, the headlight of the present invention hardly causes it.

In addition, the headlight of the present invention includes two bulbs of the same type: the passing beam bulb 17. and traveling beam valve 27
The advantage is that there is compatibility between the two.

In this way, according to the embodiment described above, the light distribution characteristics of the beam during traveling illumination can be improved.

In addition, in this embodiment, the reflecting surface 2 for the passing beam
0 and the reflective surface 21 for the traveling beam, the portions below the bulb center E, which is the light source axis, have been removed over a predetermined range, and the bulb center E has been offset downward with respect to the lens center F, but only one beam has been removed. According to the purpose of the invention, at least if there is a passing lj' 7=... then M demand^19 cell lA i1
It is enough to have 1 bag, 2 bags, and 2 bags.

In addition, in the above embodiments, all valves -! #
17 and 27 are shown, but the present invention is not necessarily limited to such lamps, but can also be applied to sealed beam type lamps.

(Effects of the Invention) As explained above, according to the present invention, at least a part of the portion where the light emitted from the light source of the reflective surface that emits a passing beam is shaded by the light shielding means is removed, and the bulb center is removed. Since the lens is decentered downward with respect to the center, there is no need to waste the lower half of the reflective surface being used during low-pass lighting, and the entire reflective surface can be fully utilized. In addition, because the lens surface has a shorter height dimension than conventional ones, it is possible to obtain illumination light with the same brightness as conventional ones, so there is more freedom in designing the mounting part of the car body for arranging the headlights. There are also advantages such as increased capacity.

In addition, since the combinations of bulbs, reflective surfaces, and lens cuts that exclusively generate the passing beam and the traveling beam are each independently provided, it is possible to independently design the lens for the passing beam and the traveling beam. Can be done,
It becomes possible to obtain the most suitable light distribution characteristics for each. Furthermore, the lens cut section for passing beams and the lens cut section for running beams can mutually compensate for the lack of illumination light that has passed through each lens cut section, which improves the light distribution characteristics of the running beam. It has various effects such as being able to keep the brightness constant and preventing uneven brightness, and making it easier to adjust the optical axis of the headlight because there is no unevenness in the light beam when driving. is obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an embodiment of a vehicle headlamp according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a vehicle shown in FIG. 1. A list comparing the light distribution characteristics of a passing beam and a running beam between a conventional vehicle headlight and a conventional vehicle headlight. Figure 4 is a front view showing the lens surface of a conventional vehicle headlight. , FIG. 5 is a cross-sectional view taken along line v-V in FIG. 4, and FIG. 6 is a cross-sectional view taken along line ■-■ in FIG. Figure 7 is a sectional view taken along the line ■-■ in Figure 4 showing the lens cut part in the wide diffusion zone of the headlamp lens in Figure 4, and Figure 8 is the arrangement of the passing beam in the conventional headlamp. FIG. 9 is a diagram showing light distribution characteristics of a running beam in a conventional headlamp. l... Filament for passing beam 2... Filament for running beam 3... Running beam 4... Passing beam 5, Lens 6... Reflector 7, Bulb 8 - Housing tS -... Passing each other Beam lens cut section 17-...
Bulb for passing beam 20 -- Reflecting surface for passing beam 21... Reflecting surface for traveling beam 25... Lens cut portion for traveling beam 27... Valve for traveling beam E... Valve center (light source axis ) F...Lens Center Patent Applicant Nissan Motor Co., Ltd. Representative Patent Attorney Tsuchibashi Kodai 4g v Figure 5

Claims (1)

[Claims] A pair of reflecting mirrors each having a reflecting surface in the shape of a paraboloid of revolution;
A light source that is installed inside one of the two reflecting mirrors and emits a passing beam; a light shielding means that blocks the front and bottom of this light source; another light source provided and emitting a traveling beam;
In a vehicle headlamp comprising a lens attached to cover the front surface of each reflector, the reflector provided with the light source that emits the above-mentioned passing beam is such that the light emitted from the light source is blocked by the light-shielding means. A headlamp for a vehicle, characterized in that at least a part of a portion that becomes a shadow is removed, and the axis of the light source is offset downward with respect to a lens center position.