JP2000222921A - Automotive lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light for an automobile which can emit light of lamp forward effectively without use of a lamp having large power consumption. SOLUTION: Plane subreflecting surfaces 3, 7 are successively arranged above and under a main reflecting surface 2 comprising paraboloid to form a reflector 10 with a rectangular opening 11. A bulb 4 is arranged within the reflector 10. A plurality of elongate protrusive reflecting part 5 are protrusively mounted on a reflecting surface of the subreflecting surface 3 at predetermined intervals to reflect down light beam 60 forward and crosswise, thereby illuminance combined with irradiating light is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive lamp such as a headlight or a fog lamp provided with a reflector.

[0002]

2. Description of the Related Art Automobile lamps such as headlights and fog lamps illuminate the front of a vehicle when traveling at night or in darkness, so that the illuminance can be checked from the left and right of the road and the presence or absence of obstacles. Is required.
Therefore, typically a 55 watt to 60 watt output power bulb connected to a 12 volt or 24 volt battery mounted on the vehicle is used as the light source.

[0003] On the other hand, light is emitted from the bulb in all directions. In order to guide the light to the front of the automobile, the automobile lamp has a reflector for reflection, and a structure in which the bulb is provided inside the reflector. Has become. Most preferably, the reflector is formed such that the entire reflecting surface is formed in a substantially parabolic shape. However, in actual automobiles such as four-wheeled and two-wheeled vehicles, the shape of the opening of the reflecting surface is often required to be a rectangular shape that is horizontally long due to design requirements. A rectangular reflector is provided, which is a surface, and sub-reflection surfaces each formed of a plane are continuously provided above and below the main reflection surface.

FIGS. 7 (a) to 7 (c) show actual fairness 3-504.
2 shows a conventional automotive lamp provided with a rectangular reflector described in Japanese Patent Application Publication No. 2 (JP-A) No. 2 (1995) -209. Main reflection surface 1 that is parabolic
A reflector 100 is formed by connecting sub-reflection surfaces 120 and 130 each having a plane above and below the reflector 10, and a bulb 140 serving as a light source is disposed inside the reflector 100.

The light beam emitted from the bulb 140 is reflected forward by the main reflecting surface 110 formed of a paraboloid. However, as shown in FIG. 7B, the light rays in the vertical direction indicated by the range L directed to the planar sub-reflection surfaces 120 and 130 are not reflected forward and are invalid light.

FIG. 7C shows the range of invalid light in the left-right direction by an arrow H. In order to reflect these invalid lights forward even a little, in the above-mentioned conventional automobile lighting,
The lower sub-reflecting surface 130 is provided with a downward angle, and the light reflected by the rear main reflecting surface 110 is again reflected by the lower sub-reflecting surface 13.
The light is reflected at 0 and radiated horizontally forward. Thereby, the illuminance is improved, and glare light reflected upward is reduced.

[0007]

However, in any case, in the conventional lamp, the light rays in the ranges L and H directed to the sub-reflection surfaces 120 and 130 are not emitted from the reflector 100 to the front surface, and are invalid. It has become light.

As described above, in the conventional lamp provided with the rectangular reflector 100, there is invalid light that does not exit forward from the planar sub-reflection surfaces 120 and 130, and a sufficient illuminance can be obtained. Is not possible.

On the other hand, it is possible to secure a target illuminance by using a valve having large power consumption. However, a large-capacity battery is required for driving the valve, and low fuel consumption is required. It would be contrary to the requirements of certain cars. In addition, simply using a bulb with a large illuminance also has a problem that is unfavorable for an oncoming vehicle, because the scattered light becomes strong and dazzling light.

The present invention has been made in view of such conventional problems, and is capable of efficiently emitting light from a bulb to the front without using a bulb with large power consumption. It is an object to provide a lighting fixture.

[0011]

In order to achieve the above object, an invention according to claim 1 comprises a reflector having a main reflecting surface formed of a paraboloid and a sub-reflecting surface formed of a flat surface, and a reflector of the reflector. A vehicular lamp having a bulb disposed therein, wherein a plurality of reflection ridges for reflecting light rays emitted from the bulb and traveling toward the sub-reflection surface in front of and laterally from the reflector are provided on the sub-reflection surface. Are arranged side by side at predetermined intervals.

In the present invention, the plurality of reflecting ridges formed on the sub-reflecting surface reflect light from the bulb in front of the reflector and in the lateral direction. Therefore, even from a rectangular reflector, light from the bulb can be efficiently emitted to the front of the reflector.

According to a second aspect of the present invention, in the first aspect of the present invention, each of the reflecting ridges is provided such that the light reflected from the reflecting ridge has an angle that does not interfere with an adjacent reflecting ridge. It is characterized by having.

According to the present invention, since the reflected light from the reflection ridge does not interfere with the adjacent reflection ridge, most of the light can be emitted to the front of the reflector, and more efficient irradiation can be performed.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the reflecting ridge near the bulb reflects light toward the front side of the reflector, and the reflecting ridge away from the bulb is a bulb. It is provided so as to reflect light rays so as to spread outward from the front surface of the reflector as the distance from the reflector increases.

According to the present invention, the light is reflected so that the reflection ridge spreads outward as the distance from the bulb increases, so that the reflected light from the reflection ridge does not interfere with the illumination more reliably, and the illuminance can be improved.

The invention according to claim 4 is the invention according to claims 1 to 3, wherein each of the reflecting ridges has a substantially parabolic shape centered on the bulb.

According to the present invention, since each reflecting ridge has a substantially parabolic shape centering on the bulb, light from the bulb can be efficiently emitted to the front of the reflector even with a rectangular reflector. .

[0019]

Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIG. 1, the vehicle lighting device 1 includes a reflector 10 and a bulb 4 as a light source disposed inside the reflector 10.

The reflector 10 has a main reflecting surface 2 having a substantially parabolic surface, and upper and lower sub-reflecting surfaces 3 and 7 provided above and below the main reflecting surface 2. The upper and lower sub-reflection surfaces 3 and 7 are planes, and the sub-reflection surfaces 3 and 7 formed of the planes are connected to the main reflection surface 2 so that the entire reflector 10 is square. The bulb 4 has a filament 41 and is arranged at a central portion of the reflector 10 opposite to the opening 11. In such a lamp 1, the light beam emitted from the bulb 4 is reflected forward by the substantially parabolic main reflection surface 2, becomes the main irradiation light from the opening 11, and irradiates the traveling direction of the automobile.

In this embodiment, the upper and lower sub-reflection surfaces 3, 3
7, a plurality of reflecting ridges 5 project from the lower sub-reflecting surface 3 at predetermined intervals so that a downwardly emitted light beam 60 emitted from the bulb 4 and directed toward the sub-reflecting surface 3 is directed forward and laterally. Is used as the effective irradiation light.

The reflecting ridge 5 projects from the central portion of the sub-reflecting surface 3, has a vertex near the bulb 4 serving as a light source, and has a substantially parabolic shape opened toward the opening 11 of the reflector 10. A first reflecting ridge 51, a second reflecting ridge 52 substantially in the shape of a parabola protruding from the outside of the first reflecting ridge 51 and spaced apart from the outside and having a virtual apex behind the bulb 4; A third reflection ridge 53 is provided outside the reflection ridge 52 at a distance. In this embodiment, three reflecting ridges 51, 52, and 53 are provided, but the number is not limited as long as the number is one or more.

The rising angle of the reflecting surface of each of the reflecting ridges 51, 52, and 53 is 45 degrees in the vicinity immediately below the bulb 4, and the ridge is formed so as to become smaller as the distance from the bulb 4 toward the opening 11 decreases. It is formed so that it becomes. Thereby, as shown in the cross-sectional view of FIG. 2, the light beam 6 from the bulb 4 going downward can be reflected laterally and forward by the reflecting ridges 51, 52, 53.

FIG. 3 shows the reflection from the sub-reflection surface 3. The light beam r 1 emitted from the bulb 4 is reflected by the first reflection ridge 51 and becomes the first reflection light 61 traveling toward the front of the reflector 10. . Further, the light beam r2 that has proceeded to the right toward the opening 11 hits the middle of the first reflecting ridge 51 that is extended in a parabolic shape and is reflected forward in the front, and is likewise the first reflected light 61. Become. Further, the outgoing light r3 heading toward the distal end portion near the opening 11 is reflected forward and forward in the vicinity of the distal end of the first reflecting ridge 51, which is further opened, and similarly becomes the first reflected light 61. . Accordingly, all the light rays 61 reflected from the first reflection ridge 51 are emitted from the reflector 10 in parallel with the forward reflection optical axis 51a.

Next, the setting angles of the radiation at the second reflecting ridge 52 and the third reflecting ridge 53 will be described. FIG.
As shown in (a), when the light ray r5 incident on the second reflection ridge 52 is reflected in parallel to the front-facing reflection optical axis 51a in the same manner as the first reflection ridge 51, the second First reflective ridge 5 protruding adjacent to two reflected lights 62
The light cannot be emitted forward because it interferes with the back surface of the light emitting device 1. Similarly, when the outgoing light r6 directed to the third reflection ridge 53 is reflected in parallel to the front-facing reflection optical axis 51a, the light is blocked forward by the back surface of the adjacent second reflection ridge 52, and thus is directed forward. It cannot be emitted.

In order to use these as effective irradiation light, in this embodiment, as shown in FIG. 5B, the reflection light axis 5a of the first reflection ridge 51 is set to the first reflection light 6 as the front direction.
1 is directed to the front, but the second reflection ridge 52
With respect to the reflection optical axis 51a of the first reflection ridge 51, the reflection optical axis 52a is set so as to be provided approximately 10 degrees outward on the left and right sides. As a result, the second reflected light 62 does not interfere with the back surface of the first reflecting ridge 51 and the reflector 10
Can be emitted.

Similarly, the third reflection ridge 53 is set so that the reflection optical axis 53a is provided to the right and left outwardly by about 20 degrees with respect to the reflection optical axis 51a of the first reflection ridge.
This prevents the third reflected light 63 from interfering with the rear surface of the second reflecting ridge 52.

By setting the angle of the reflection optical axis to be greater as the reflection ridge is positioned further outward, as shown in FIG.
As shown by, the light beam r5 is reflected by the second reflection ridge 52 provided so as to be reflected in the direction of the optical axis facing outward by 10 degrees, whereby the back side of the first reflection ridge 51 is grazed. The reflected light 62 can be emitted from the opening 11.

Similarly, the third reflecting ridge 53 is provided so as to reflect in the direction of the reflected optical axis directed outward by 20 degrees.
6 can be emitted from the opening 11 as third reflected light 63 directed outward from the front by 20 degrees.

FIG. 4 shows the reflection ridge 5 set as described above.
1, 52, 53, the main reflection surface 2
For each reflected ridge 51,
Irradiation is performed so that reflected light beams 61, 62 and 63 from 52 and 53 overlap. For this reason, illuminance can be improved.

FIG. 6 shows an irradiation state of a car A equipped with the lamp of this embodiment, B is a roadway, C is a center separation line,
D is a sidewalk. The illumination light from the lamp 1 on the driver's seat side of the automobile A running on the road B is reflected by the first reflection light 61 reflected by the first reflection protrusions 51 of the main reflection surface 2 and the sub reflection surface 3 in front. The second reflected light 62 illuminated and reflected by the second reflecting ridge 52 illuminates the front side by 10 degrees outward, and the third reflecting ridge 53
The third reflected light 63 reflected at the side further illuminates the outside front by 20 degrees. In actual mounting to a car, as shown in FIG. 4, the lamp on the driver's seat side is mounted such that the center of the optical axis is directed inward toward the vehicle center axis V, whereby the irradiation light is reduced. It is intended to prevent the driver of the oncoming vehicle from dazzling beyond the center separation line C.

In this embodiment, the reflection ridge 5 provided on the lower surface of the sub-reflection surface 3 has been described. However, in the present invention, the reflection ridge 5 may be provided on the sub-reflection surface 7 on the upper surface. May be provided on the sub-reflection surfaces 3 and 7. Further, the sub-reflection surface 3 on the lower surface may be inclined downward toward the opening portion 11, whereby it is possible to increase the reflectance for reflecting the light rays from the bulb 4 in the horizontal direction, thereby improving the illuminance. is there.

[0033]

According to the present invention, a plurality of reflection ridges are provided on the sub-reflection surface connected to the main reflection surface. The amount of reflected light can be increased, and efficient illumination can be performed even for an automotive lamp having a square reflector. Therefore, even with a low power consumption bulb, higher illuminance can be obtained than with a conventional rectangular automobile lamp, thereby eliminating the need for a large capacity battery.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3A is a plan view (a cross-sectional view taken along the line CC of FIG. 1) showing the operation of the embodiment, and FIG. 3B is a cross-sectional view taken along the line BB.

FIG. 4 is a front view showing an irradiation pattern according to the embodiment.

FIGS. 5A and 5B are plan views illustrating the setting of a reflection ridge.

FIG. 6 is a plan view showing a state in which the lamp is attached to the vehicle.

FIGS. 7A, 7B and 7C are cross-sectional views showing a conventional lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automotive lamp 2 Main reflection surface 3 7 Secondary reflection surface 4 Bulb 5 Reflection protrusion 6 Reflected light beam 10 Reflector 11 Opening 51 First reflection protrusion 52 Second reflection protrusion 53 Third reflection protrusion 61 First reflected light 62 Second reflected light 63 Third reflected light

Claims (4)

[Claims] 1. An automotive lighting device comprising: a reflector having a main reflecting surface formed of a paraboloid and a sub-reflecting surface formed of a flat surface connected to each other; and a bulb disposed inside the reflector. A vehicular lamp characterized in that a plurality of reflecting ridges for reflecting light emitted and traveling toward the sub-reflection surface in front of the reflector and in the lateral direction are arranged side by side at predetermined intervals on the sub-reflection surface. 2. The vehicle lighting device according to claim 1, wherein each of the reflection ridges is provided such that a light beam reflected from the reflection ridge does not interfere with an adjacent reflection ridge. . 3. A reflecting ridge proximate to the bulb reflects light rays toward the front side of the reflector, and a reflecting ridge away from the bulb reflects light rays so as to spread outward from the front face of the reflector as away from the bulb. The vehicle lighting device according to claim 1, wherein the lighting device is provided in a vehicle. 4. The vehicle lighting device according to claim 1, wherein each of the reflection ridges has a substantially parabolic shape centering on the bulb.