JP2002184212A - Led lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a lighting surface becomes speckled by strong ly receiving a direct light from a LED lamp and the number of use is increased to generate a cost up since a radiation angle is narrow at a vehicle lighting fixture adopting a conventional LED lamp as a light source. SOLUTION: According the present invention, the LED lamp 2 is covered, from a radiation direction side, by radially combining a plurality of elliptical reflection surfaces 3 formed by a rotation ellipse surface making the LED lamp 2 as a first focus and making an axis Y approximately perpendicularly crossing an optical axis X of the LED lamp as a long axis; a paraboloidal reflection surface 4 formed by a rotated parabolic surface, in which a radiation direction is approximately parallel to the optical axis of the LED lamp, making a second focus as a focus corresponding to the second focus of the respective elliptical reflection surface 3 is provided; and a light distribution formation lens 5 is provided at a radiation direction side of he paraboloidal reflection surface 4. Thereby, an area of a light collected at a front side of the LED lamp can be enlarged with uniform brightness to solve the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp for a signal such as a stop lamp or a tail lamp, and as a light source.
The present invention relates to a configuration of a vehicle lamp employing an ED lamp.

[0002]

2. Description of the Related Art A conventional LED vehicle lamp 90 of this type is known.
FIG. 5 shows an example of the configuration of FIG. 5, which surrounds the LED lamp 91 employed as a light source and has, for example, a paraboloid of revolution whose focal point is near the chip position of the LED lamp 91. A reflection plate 92 is attached. And, covering the LED lamp 91 and the reflector 92,
A lens 93 having a convex lens cut 93a or the like is provided.

[0003]

However, in the LED vehicle lamp 90 having the above-mentioned conventional structure, the LE is not provided.
Since the D lamp 91 has a characteristic of emitting light in the form of a beam having a narrow angle α in the optical axis X direction, the reflection plate 92
The reflected light amount is small, and there is practically no effect. Therefore, when viewing the lens 93, only the direct light emitted in the direction of the optical axis X is strongly recognized, thereby causing a problem that the surface of the lens 93 shines like a spot and the appearance is impaired.

Further, since the light is emitted in the form of a beam having a narrow angle α as described above, the range of the surface of the lens 93 irradiated from one LED lamp 91 is narrow, and in order to shine the front surface of the lens 93, Since a large number of LED lamps 91 are required, there is a problem that the cost of the LED vehicle lamp 90 increases.

Here, in order to solve the above problem, L
LE until the beam from the ED lamp 91 spreads sufficiently.
Means for setting the distance between the D lamp 91 and the lens 93 to be long can be considered. In this case, the LED vehicle lamp 90 is used.
Becomes deeper, for example, equivalent to or more than a vehicle lamp using an incandescent light bulb and a reflector in combination, and has a purpose of using the LED lamp 91 as a light source, that is, a vehicle lamp. It is impossible to reduce the thickness and the purpose is lost.

[0006]

SUMMARY OF THE INVENTION The present invention is, as a concrete means for solving the above-mentioned conventional problems, as an LED lamp as a light source, the LED lamp as a first focus, and a long axis as an optical axis of the LED lamp. A plurality of elliptical reflecting surfaces that are spheroidal surfaces that are substantially orthogonal to are radially combined to cover from the irradiation direction side, and corresponding to the second focal point of each elliptical reflecting surface, this second focal point is used as the focal point. Set the irradiation direction to the LED
A parabolic reflective surface that is a paraboloid of revolution that is substantially parallel to the optical axis of the lamp is provided, and a light distribution forming lens that has a substantially convex lens shape is provided on the irradiation direction side of each of the parabolic reflective surfaces. LED vehicle lighting device, and
An LED lamp as a light source, an ellipse having the LED lamp as a first focus and a long axis substantially orthogonal to an optical axis of the LED lamp;
Assuming a parabola whose focal point is the second focal point of the ellipse and whose axis is substantially parallel to the optical axis, the ellipse is referred to as a parabola by the L
The ED lamp is rotated around the optical axis to form an outer-axis spheroidal reflecting surface and an outer-axis rotating parabolic reflecting surface, and a substantially donut shape is formed on the irradiation direction side of the outer-axis rotating parabolic reflecting surface. An object of the present invention is to solve the problem by providing an LED vehicle lamp in which a cylindrical lens is provided as a light distribution forming lens.

[0007]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 and FIG. 2 show a first embodiment of an LED vehicle lighting device 1 according to the present invention.
One LED lamp 2, a plurality of elliptical reflecting surfaces 3, a parabolic reflecting surface 4 having the same number as the elliptical reflecting surfaces 3, and a light distribution forming lens 5 having the same number as the elliptical reflecting surfaces 3. It is composed of In the first embodiment, in addition to the above, a direct lens 6 and a light distribution forming lens 5 corresponding to the direct lens are also provided, but these will be described in detail later. .

The LED lamp 2 is mounted on an appropriate substrate or the like with an optical axis X set so that the irradiation direction is substantially the same as the irradiation direction of the vehicular lamp 1. The elliptical reflecting surface 3 has a shape obtained by cutting a spheroid obtained by rotating an ellipse along the major axis Y in a direction along the major axis, and in the first embodiment, the major axis Y is The first focus f1 is orthogonal to the optical axis X and the first focus f1 is
The light emitting source 2a is set in accordance with the light emitting source 2a.

Here, in the present invention, a plurality of the elliptical reflecting surfaces 3 are provided, and the respective elliptical reflecting surfaces 3 are combined so as to share the first focal point f1.
In FIG. 1, four elliptical reflecting surfaces 3 are combined, and the respective elliptical reflecting surfaces 3 are combined with each other with the major axis Y at an interval of 90 °. The number and the angle at which the combination is performed are not limited.

The plurality of elliptical reflecting surfaces 3 combined as described above are provided so as to cover the LED lamp 2 from the irradiation direction side. Therefore, the light emitted from the LED lamp 2 is transmitted to the second focal point f of each of the elliptical reflecting surfaces 3.
The light source image is formed at the position 2.

The parabolic reflecting surface 4 has a rotation axis Z parallel to the optical axis X, and is a rotating paraboloid having a focal point at the second focal point f2 of each of the elliptical reflecting surfaces 3. Is formed. In addition, at this time, it is provided outside the elliptical reflecting surface 3 as appropriate, so that the reflected light from the parabolic reflecting surface 4 is not blocked by the elliptical reflecting surface 3.

With the above configuration, the LED lamp 2
Is captured by each elliptical reflecting surface 3, converges at the second focal point f 2 of each elliptical reflecting surface 3, and is parallelized by the respective parabolic reflecting surface 4 in the irradiation direction. It will be projected. Therefore, if the light distribution forming lens 5 having an appropriate diffusing action, such as a convex lens, is installed on the light flux from the parabolic reflecting surface 4, the LED
Light distribution characteristics as the vehicle lamp 1 are formed.

In the above, the configurations of the elliptical reflecting surface 3, the parabolic reflecting surface 4, and the light distribution forming lens 5 in one LED lamp 2 have been described in order to simplify the description and facilitate understanding. However, in actual implementation, the overall light emitting area of the LED vehicle lamp 1 is determined in consideration of the vehicle design and the like. It is possible to arrange the LED lamps 2, provide the same configuration for each LED lamp 2, and expand the light emitting area.

With the above configuration, the LED of the present invention
The vehicular lamp 1 divides the highest illuminance portion of the light emitted from the LED lamp 2 by the elliptical reflecting surface 3 into a number provided with the elliptical reflecting surface 3, and the division is performed. Since the object is projected in the irradiation direction through the light distribution forming lens 5 in a state where the light emitting area is expanded by the parabolic reflecting surface 4, the light emitting area can be expanded for one LED lamp 2. The number of the LED lamps 2 used in the LED vehicle lighting device 1 can be reduced, and, for example, light concentrated in the direction of the optical axis X, which occurs in the conventional example, and a spot-like appearance can be eliminated.

Next, the direct lens 6 and the light distribution forming lens 5 attached thereto will be described. The direct lens 6 is provided on the optical axis X of the LED lamp 2 and divides the light from the elliptical reflecting surface 3 and the LED lamp 2 equally. That is, when the number of the elliptical reflecting surfaces 3 provided is four, the direct lens 6 is set to have a diameter that transmits about one fifth of the light from the LED lamp 2.

In the first embodiment, the light distribution forming lens 5 is the same as the one provided corresponding to the parabolic reflecting surface 4, and the design is unified. I have. Here, the direct lens 6 will be described again. The direct lens 6 has an appropriate curvature for diffusing the light incident from the LED lamp 2 over the entire surface of the light distribution forming lens 5, and sees the lighting state. Sometimes, all the light distribution forming lenses 5 shine with uniform brightness so as not to give a viewer an uncomfortable feeling.

By providing the direct lens 6 and the corresponding light distribution forming lens 5 as described above, for example, when there are six elliptical reflecting surfaces 3 or the like, the corresponding light distribution forming lens 3 is provided. The arrangement of the lens 5 is ring-shaped, and the lens having a feeling of dropout is provided. By providing the direct lens 6, the light distribution forming lens 5 can be provided at the center of the above-mentioned ring, thereby improving the appearance. It is to let.

FIG. 3 shows a second embodiment of the LED vehicle lamp 1 according to the present invention. In the first embodiment, the major axis Y of the elliptical reflecting surface 3 is orthogonal to the optical axis X of the LED lamp 2. And
The description has been made on the assumption that the rotation axis Z of the parabolic reflecting surface 4 is parallel to the optical axis X. However, the present invention is not limited to this. For example, as shown in FIG. 3, at least a part of the long axis Y of the elliptical reflecting surface 3 intersects obliquely with respect to the optical axis X, and By making the rotation axis Z of the reflection surface 4 orthogonal to the long axis Y, some of the light distribution forming lenses 5 are inclined with respect to the irradiation direction, so that the irradiation angle can be increased or the design change can be prevented. It is a good thing to give.

FIG. 4 shows an LED vehicle lamp 1 according to the present invention.
In the third embodiment, one L
The ED lamp 2 is provided with an elliptical reflecting surface, a parabolic reflecting surface, and a light distribution forming lens, as in the first and second embodiments.

However, in the first embodiment (and the second embodiment, hereinafter the same), the first focal point f1 is
The ellipse positioned on the optical axis X of the lamp 2 is rotated about the long axis Y substantially orthogonal to the optical axis X to obtain an elliptical reflecting surface. In the third embodiment, however, the first focal point f1 is An ellipse positioned on the optical axis X of the LED lamp 2 is rotated about the optical axis X to form an outer-axis spheroidal reflecting surface 13.

In the first embodiment, the parabolic reflecting surface is rotated by the rotation axis Z passing through the second focal point f2 of the elliptical reflecting surface and substantially parallel to the optical axis X in the first embodiment. In the third embodiment, the parabola is rotated about the optical axis X in the same manner as the outer-axis spheroidal reflecting surface 13 to form the outer-axis rotating parabolic reflecting surface 14. Also, in the light distribution forming lens, the donut-shaped cylindrical lens 15 is rotated by rotating the cross-sectional shape of the convex lens shape around the optical axis X.
And That is, the shape of the third embodiment is obtained by rotating the cross-sectional shape of the first embodiment shown in FIG.

As described above, the outer-axis spheroidal reflecting surface 13,
The light emitted from the LED lamp 2 is reflected by the outer-shaft spheroidal reflecting surface 13 and is formed in a ring shape at the second focal point f2 by comprising the outer-shaft rotating parabolic reflecting surface 14 and the donut-shaped cylindrical lens 15. It will converge. And
When the ring-shaped light converged at the second focal point f2 is also reflected by the ring-shaped outer-axis paraboloidal reflecting surface 14, a ring-shaped parallel light beam centering on the LED lamp 2 is obtained. The parallel light is diffused by the donut-shaped cylindrical lens 15 to obtain light distribution characteristics. still,
The operation and effects of the third embodiment are substantially the same as those of the first embodiment, and thus detailed description thereof will be omitted.

Also at this time, only the donut-shaped cylindrical lens 15 shines during lighting, causing a sense of hollowness as in the first embodiment. And light distribution forming lens 5
Is provided so as to emit light even in the center of the donut-shaped cylindrical lens 15 so as to prevent a feeling of hollowness,
You can freely improve your aesthetics.

[0024]

As described above, according to the present invention, L
An ED lamp is used as a light source, and a plurality of elliptical reflecting surfaces having an LED lamp as a first focal point and a long axis having a spheroidal surface substantially orthogonal to the optical axis of the LED lamp are combined radially to cover from the irradiation direction side. Corresponding to the second focal point of each of the elliptical reflective surfaces, a parabolic reflective surface is provided which is a paraboloid of revolution having the second focal point as a focal point and an irradiation direction substantially parallel to the optical axis of the LED lamp. An LED vehicle lamp in which a light distribution forming lens having a substantially convex lens shape is provided on the irradiation direction side of each of the parabolic reflecting surfaces, or
A lamp as a light source, an ellipse having the LED lamp as a first focal point and a major axis substantially orthogonal to an optical axis of the LED lamp, and a parabola having a second focal point of the ellipse as a focal point and an axis substantially parallel to the optical axis. Assuming that the ellipse and the parabola are rotated about the optical axis of the LED lamp as an axis to form an outer-axis rotating ellipsoidal reflecting surface and an outer-axis rotating parabolic reflecting surface, An approximately donut-shaped cylindrical lens is provided as a light distribution forming lens on the irradiation direction side of the system reflecting surface, so that light from one LED lamp is split or ringed by an elliptical reflecting surface. Unfold, and
As a configuration in which the area is enlarged by a parabolic reflecting surface, the characteristics of the LED lamp in which light is concentrated on the front are alleviated to prevent the light emitting surface from shining like a spot, and the LED lamp can shine with one LED lamp. By increasing the area, the number of LED lamps used can be reduced, and this type of LED vehicle lamp has extremely excellent effects in improving performance and reducing costs.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an LED vehicle lamp according to the present invention.

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

FIG. 3 is a sectional view showing a second embodiment of the LED vehicle lamp according to the present invention.

FIG. 4 is a front view showing a third embodiment of the LED vehicle lamp according to the present invention.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LED vehicle lamp 2 ... LED lamp 3 ... Elliptical reflective surface 4 ... Parabolic reflective surface 5 ... Light distribution forming lens 6 ... Direct lens 13 ... Outer axis spheroidal reflective surface 14 ... Reflection surface of outer-axis rotating parabolic system 15 ... Doughnut-shaped cylindrical lens

Claims (3)

[Claims] 1. An LED lamp as a light source, a plurality of elliptical reflection surfaces having a spheroid substantially perpendicular to the optical axis of the LED lamp and a major axis of the LED lamp as a first focal point, and radiating the plurality of elliptical reflection surfaces in a radial manner. A paraboloid that covers from the direction side and has a paraboloid of revolution corresponding to the second focal point of each of the elliptical reflecting surfaces and having the second focal point as a focal point and an irradiation direction substantially parallel to the optical axis of the LED lamp. L, wherein a light distribution forming lens having a substantially convex lens shape is provided on the irradiation direction side of each of the parabolic reflection surfaces.
Lighting equipment for ED vehicles. 2. An LED lamp as a light source, an ellipse having the LED lamp as a first focal point and a major axis substantially orthogonal to an optical axis of the LED lamp, and a second focal point of the ellipse as a focal point and an axis at the optical axis. Assuming a parabola to be substantially parallel, this ellipse and the parabola are rotated about the optical axis of the LED lamp as an axis to form an outer-axis spheroidal reflecting surface and an outer-axis rotating parabolic reflecting surface, An LED vehicle lamp, wherein a substantially donut-shaped cylindrical lens is provided as a light distribution forming lens on the irradiation direction side of the outer-axis rotating parabolic reflecting surface. 3. A direct lens is provided at a position on the optical axis of the LED lamp on the elliptical reflecting surface or the outer axis spheroidal reflecting surface, and a substantially convex lens is disposed in front of the direct lens. 3. The LED vehicle lamp according to claim 1, further comprising a light forming lens.