JP4138438B2 - Lighting fixtures for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular lamp, and particularly relates to a configuration of a vehicular lamp for illumination used for irradiating a road surface in a traveling direction such as a headlamp and a fog lamp.
[0002]
[Prior art]
As an example of a configuration of a vehicular illuminating lamp in which a conventional front lens is substantially transparent and forms a light distribution characteristic with a parabolic reflecting surface, the reflecting surface is divided into a plurality of segments in a substantially vertical direction. This segment is formed into a shape in which a parabola with a light source as a focal point appears in a vertical section and a curved surface causing diffusion such as a straight line or a convex surface appears in a horizontal section.
[0003]
By doing so, the reflected light having the irradiation angle corresponding to the diffusion angle of the curved surface formed in the horizontal width of the segment in the horizontal direction is converged in the vertical direction from each segment from the light source. Therefore, by adjusting the direction of each segment, etc. according to the desired light distribution characteristics, it is possible to obtain a vehicle lamp for lighting such as a headlamp without applying a lens cut to the front lens. It becomes. (For example, see Patent Document 1)
[0004]
[Patent Document 1]
JP 2001-048810 A ("0002" to "0005" items, FIG. 5)
[0005]
[Problems to be solved by the invention]
However, when the lamp 90 is configured so as to form the light distribution characteristics on the reflecting surface 92 (segment 92a) as described above, the vehicle is required to have a narrow light distribution characteristic in the vertical direction and a wide light distribution characteristic in the horizontal direction. In the lamp 90, as shown in FIG. 7, the distribution of light in the left-right direction is set by the reflecting surface 92 at the back of the vehicular lamp 90, so that the lamp 90 is installed in front of the reflecting surface 92. The extension 95 or the like causes vignetting and a sufficient left and right irradiation width cannot be obtained. For example, in a situation where bending is severe such as a mountain road, a portion where light does not reach is generated and the visibility is poor. It was happening.
[0006]
[Means for Solving the Problems]
As a specific means for solving the above-described conventional problems, the present invention provides a vehicular illumination lamp in which a front lens is substantially transparent and a light distribution characteristic is formed by a main reflecting surface having a paraboloidal system. The first focal point is set in the vicinity of the light source at at least one of the positions above or below the light source of the main reflection surface, and the second focal point is substantially in front of the light source and between the front lens and the light source. An ellipsoidal reflecting surface is provided that has a focal point and is positioned substantially rearward of the light source. The ellipsoidal reflecting surface is focused in front of the light source and between the front lens and the second focal point. The present invention solves the problem by providing a vehicular illumination lamp characterized in that a parabolic reflecting surface having an optical axis obliquely forward is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 to 3 is a first embodiment of a vehicular illumination lamp 1 according to the present invention. The vehicular illumination lamp 1 includes a light source 2, a main reflection surface 3, and a front lens 4. The front lens 4 is not subjected to lens cut, and the light distribution characteristic is formed by the main reflecting surface 3 as in the conventional example.
[0008]
Further, in order to obtain the light distribution characteristics, the main reflection surface 3 is divided in the vertical direction to form the segments 3a, and each of the segments 3a has a vertical section as described in the conventional example. A parabola focusing on the light source 2 or the vicinity of the light source 2 appears, and is formed in a curved surface called a parabolic column surface in which, for example, a straight line appears in the horizontal direction, and is narrow in the vertical direction and wide in the horizontal direction The same is true in that reflected light radiating at an angle is obtained, and light distribution characteristics are formed by the total of reflected light from these segments 3a.
[0009]
Therefore, the irradiation angle that can be set with respect to the horizontal direction is limited by the position where the extension 7 is provided, and for example, there is a concern that visibility may be lacking on a road that is severely bent such as a mountain road. Therefore, in the present invention, the ellipsoidal reflecting surface 5 and the parabolic reflecting surface 6 are provided as a configuration for solving the above-described problem that the irradiation width in the left-right direction is insufficient.
[0010]
First, the ellipsoidal reflecting surface 5 is formed as an ellipsoid with the first focal point f1 set on the light source 2, and the second focal point f2 is set in front of the light source 2 at this time. . At this time, in the first embodiment, the position where the ellipsoidal reflecting surface 5 is provided and the number thereof are described above as a single line above the vertical line passing through the center of the main reflecting surface 3, The present invention does not necessarily limit the positions and numbers described above, and those positions and numbers will be described in later embodiments.
[0011]
In the first embodiment, the parabolic reflecting surface 6 is formed as one reflecting surface such as a rotating paraboloid focusing on the vicinity of the second focal point f2 of the ellipsoidal reflecting surface 5. In this case, when the vehicular illumination lamp 1 is attached to the left side of the vehicle body, the optical axis Y of the parabolic reflecting surface 6 is irradiated as the vehicular illumination lamp 1. When the vehicle illumination lamp 1 is mounted on the right side of the vehicle body, it is similarly inclined toward the right side with respect to the direction X.
[0012]
With this configuration, the parabolic reflecting surface 6 reflects the image of the light source 2 formed at the position of the second focal point f2 ahead of the light source 2 by the ellipsoidal reflecting surface 5. The light is projected as a parallel light beam in the diagonally forward direction. Therefore, even when the optical axis Y of the paraboloidal reflecting surface 6 is strongly inclined, it is projected to the outside from the front lens 4, that is, the irradiation angle as the vehicular illumination lamp 1 can be expanded. Become.
[0013]
FIG. 4 shows the light distribution characteristic D of the vehicular illumination lamp 1 of the present invention having the above-described configuration. This light distribution characteristic D is a light distribution characteristic formed by the light source 2 and the main reflecting mirror 3. It is configured as a combination of D1 and a light distribution characteristic D2 formed by the light source 2, the ellipsoidal reflecting surface 5, and the parabolic reflecting surface 6.
[0014]
Here, the light distribution characteristic D1 is almost the same as the light distribution characteristic of the vehicular illumination lamp described in the conventional example, and there is a concern that the irradiation width in the left-right direction is insufficient on a mountain road or the like. In the present invention, by adding the light distribution characteristic D2 (L, R) in addition to the light distribution characteristic D1, the left and right irradiation width of the total light distribution characteristic D is expanded.
[0015]
Therefore, in this first embodiment, the light distribution characteristic D2 (R) from the vehicular illumination lamp 1 attached to the right side (viewed from the driver's seat side) of the vehicle body is connected to the right side of the light distribution characteristic D1 to the right side. The light distribution characteristic D2 (L) from the vehicular illumination lamp 1 attached to the left side of the vehicle body is connected to the left side of the light distribution characteristic D1 to widen the left side irradiation angle. It is said that.
[0016]
FIG. 5 shows a second embodiment of the vehicular illumination lamp 1 according to the present invention. In this second embodiment, one elliptical reflecting surface 5 is located above the vertical line passing through the center of the main reflecting surface 3. However, it is the same as the previous first embodiment in that the light source 2 or the vicinity thereof has the first focal point f1.
[0017]
On the other hand, the parabolic reflecting surface 16 has a parabolic reflecting surface right portion 16R having an axis YR toward the right front and a parabolic reflecting surface left portion 16L having an axis YL toward the left front. However, the surface on the side receiving light from the second focal point f2 is cut along a vertical cross section passing through the center line of the main reflecting surface 3, and each is joined.
[0018]
By doing so, the light from the ellipsoidal reflecting surface 5 that converges to the second focal point f2 is reflected by the paraboloid reflecting surface right portion 16R in a substantially right direction in the right front direction. The remaining approximately half of the amount of light irradiates the left front direction by the parabolic reflecting surface left portion 16L.
[0019]
That is, according to the second embodiment, a single lighting lamp 1 for a vehicle can obtain a lighting lamp having a wide irradiation width on the left and right. Therefore, for example, only one lighting lamp for a vehicle is used as a headlamp such as a motorcycle. Even in a vehicle type that can only be provided, the vehicular illumination lamp 1 having a sufficient irradiation angle in the horizontal direction can be provided.
[0020]
FIG. 6 shows a third embodiment of the vehicular illumination lamp 1 according to the present invention. In this third embodiment, both the ellipsoidal reflecting surface 15 and the parabolic reflecting surface 16 provide the light source 2. As a reference, the ellipsoidal reflecting surface 15 and the parabolic reflecting surface 16 provided on the upper and lower sides are set to the left and right as in the parabolic reflecting surface 16 of the second embodiment. Is also divided.
[0021]
That is, the ellipsoidal reflecting surface 15 includes an upper ellipsoidal reflecting surface 15U provided above the light source 2, a lower ellipsoidal reflecting surface 15D provided below the light source 2, and an upper ellipsoidal surface. The system reflecting surface 15U is provided with an upper ellipsoidal reflecting surface right portion 15UR and an upper ellipsoidal reflecting surface left portion 15UL, and the lower ellipsoiding reflecting surface 15D is also disposed below the lower ellipsoiding reflecting surface right portion 15DR. An ellipsoidal reflective surface left portion 15DL is provided. All the reflecting surfaces 15UR, 15UL, 15DR, and 15DL are formed as an ellipsoidal system having the light source 2 as the first focal point.
[0022]
Similarly, the parabolic reflection surface 16 also includes an upper parabolic reflection surface 16U corresponding to the upper elliptical reflection surface 15U and a lower parabolic reflection corresponding to the lower elliptical reflection surface 15D. The upper paraboloidal reflecting surface 16U is provided with an upper paraboloidal reflecting surface right portion 16UR and an upper paraboloidal reflecting surface left portion 16UL, and the lower paraboloidal reflecting surface 16D is provided. The surface 16D is provided with a lower parabolic reflecting surface right portion 16DR and a lower parabolic reflecting surface left portion 16DL.
[0023]
The upper parabolic reflection surface right portion 16UR (hereinafter abbreviated as upper parabolic reflection right 16UR) is the second focal point of the upper ellipsoidal reflection surface right portion 15UR (hereinafter abbreviated as upper elliptical reflection right 15UR). The parabolic reflection surface is the focal point, the upper parabolic reflection left 16UL is the second focal point of the upper elliptical reflection left 15UL, the lower parabolic reflection right 16DR is the second focal point of the lower elliptical reflection right 15DR, and the lower parabolic reflection left 16DL is This is a parabolic reflecting surface with the second focal point of the lower elliptical reflection 15DL as a focal point.
[0024]
In this third embodiment, both the ellipsoidal reflecting surface 15 and the parabolic reflecting surface 16 are installed above and below, and both reflecting surfaces 15, 16 both have a right part and a left part. However, the present invention is not limited to this. For example, both the reflecting surfaces 15 and 16 may be provided with only the upper part or only the lower part. As described in the embodiment, the right part and the left part may be provided only on the parabolic reflecting surface 16 side.
[0025]
Further, when the ellipsoidal reflecting surface 15 is installed above and below as described above, an H4 type tube generally employed as the light source 2 of this type of vehicular illumination lamp 1 has a filament. Since a hood is provided below and no light is emitted downward, appropriate measures such as adopting a tube having a C-8 filament are required.
[0026]
By providing the ellipsoidal reflecting surfaces 16 (U, D) above and below the light source 2 as described above, it becomes possible to increase the amount of light that can be diffused in the left-right direction, and for example, visibility on mountain roads and the like can be further increased. It becomes possible to improve. Further, the ellipsoidal reflecting surface 16 side is also divided into a right part and a left part, so that light directed toward the parabolic reflecting surface 16 is also clearly divided into two lines. Positioning with the system reflecting surface 16 is facilitated.
[0027]
【The invention's effect】
As described above, according to the present invention, in the vehicular illumination lamp in which the front lens has a substantially transparent shape and a light distribution characteristic is formed by the main reflection surface having a paraboloidal system, the light source of the main reflection surface is used as the light source of the main reflection surface. On the other hand, at least one of the upper and lower positions, a first focal point is set in the vicinity of the light source, a second focal point is set substantially in front of the light source and between the front lens, and is approximately from the light source. An elliptical reflecting surface is provided at the rear, approximately in front of the light source and between the front lens and the vicinity of the second focal point of the elliptical reflecting surface as a focal point, and the optical axis as an obliquely forward direction. By providing a vehicular illumination lamp with a parabolic reflecting surface, it becomes impossible to form a light distribution characteristic by the front lens, and the light distribution characteristic is at the back of the main reflecting surface. Must be formed, left and right It was difficult to set a sufficient irradiation width, but it was possible to install it in front of the front lens and the light source by relaying light through the ellipsoidal reflecting surface. As a result that a necessary and sufficient irradiation width can be obtained depending on the surface, the present invention has an extremely excellent effect in improving the performance of this type of vehicle illumination lamp.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main portion of a first embodiment of a vehicular illumination lamp according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a cross-sectional view taken along the line BB in FIG.
FIG. 4 is an explanatory diagram showing light distribution characteristics in the first embodiment.
FIG. 5 is a cross-sectional view showing a second embodiment of a vehicular illumination lamp according to the present invention.
FIG. 6 is an explanatory view showing a third embodiment of the vehicular illumination lamp according to the present invention.
FIG. 7 is an explanatory diagram showing a situation of occurrence of a problem in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vehicle lighting fixture 2 ... Light source 3 ... Main reflective surface 3a ... Segment 4 ... Front lens 5, 15 ... Ellipsoidal reflective surface 15U ... Upper ellipsoidal reflective surface 15UR ... Upper ellipse Right part of the surface reflection surface (upper elliptical reflection right)
15UL …… Upper ellipsoidal reflection surface left part (upper ellipse reflection left)
15D …… Lower ellipsoidal reflecting surface 15DR …… Lower ellipsoidal reflecting surface right part (lower ellipse reflecting right)
15DL ...... Left part of lower ellipsoidal reflection surface (lower ellipse reflection left)
6, 16 ... Parabolic reflecting surface 16U ... Upper parabolic reflecting surface 16UR ... Upper parabolic reflecting surface right part 16UL ... Upper parabolic reflecting surface left part 16D ... Lower paraboloid Surface-based reflective surface 16DR …… Right parabolic reflective surface right portion 16DL …… Lower parabolic reflective surface left portion 7… Extension

Claims (2)

In a vehicular illumination lamp in which a front lens has a substantially transparent shape and a light distribution characteristic is formed by a main reflection surface having a paraboloidal system, at least at a position above or below the light source of the main reflection surface On the other hand, there is provided an elliptical reflecting surface in which a first focal point is set in the vicinity of the light source, a second focal point is set substantially in front of the light source and between the front lens, and substantially behind the light source. A paraboloidal reflecting surface having a focal point near the second focal point of the elliptical reflecting surface and an optical axis obliquely forward is provided between the front lens and the front lens. A vehicular illumination lamp characterized by the above. The ellipsoidal reflective surface and the parabolic reflective surface are provided as a pair of left and right at least on the parabolic reflective surface side, and the right parabolic reflective surface is from the elliptical reflective surface. Receives light and illuminates the vehicle in the diagonally forward right direction, and the left paraboloidal reflective surface receives light from the elliptical reflective surface and illuminates the diagonally forward left direction of the vehicle The vehicular illumination lamp according to claim 1.

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