JP4256964B2 - Vehicle lighting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more specifically, a light distributor or the like is provided in a light emission source, and propagates light from the light distributor. The present invention relates to a vehicular lamp having a portion as a light source.
[0002]
[Prior art]
FIG. 11 shows an example of a conventional vehicle lamp 90 of this type. For example, a light source 91 having a sufficient amount of light, such as a metal halide discharge lamp, is housed in a case 92 whose inner surface is mirror-finished and lit. For example, the other end portion 93 b of the photoconductive material 93 formed in a cable shape with an optical fiber is inserted into the case 92, and light is taken into the photoconductive material 93.
[0003]
The light thus captured is conducted through the inside of the photoconductive material 93 and is emitted from one end portion 93a with a predetermined radiation angle. If, for example, a paraboloidal reflecting surface 94 having a focal point at one end portion 93a is provided, the light emitted from the one end portion 93a is reflected as a parallel ray, and this parallel ray is converted into a lens. A desired light distribution characteristic is obtained by transmitting the lens 95 or the like to which the cut 95a is applied.
[0004]
At this time, one end portion 93a of the photoconductive material 93 has a rectangular shape similar to the filament of an incandescent bulb that has been used as a light source of this type of lamp, and is reflected by the reflecting surface 94. The characteristics of the light at that time are approximated to a lamp using a conventional incandescent light source as a light source, so that the technology accumulated up to now can be used when the light distribution characteristic is formed by the lens cut 95a.
[0005]
[Problems to be solved by the invention]
However, in the vehicular lamp 90 using the above-described conventional photoconductive material 93 as a light source, as described above, it follows the conventional technology, and is caused by adopting the photoconductive material 93. It does not pursue the action and effect peculiar to the wax, and therefore it is uncertain whether or not the photoconductive material 93 is operated under the optimum conditions.
[0006]
[Means for Solving the Problems]
The present invention is provided as a specific means for solving the above-described conventional problems at a first reflection surface of a rotating paraboloid system focusing on a light emitting source and at an appropriate position of the first reflection surface. At least one light guide path penetrating to the back surface side of the first reflection surface, a second reflection surface having a rotating paraboloid system focusing on the vicinity of the exit of the light guide path, and the first reflection surface And a third reflecting surface of a spheroidal surface system having the light emitting source as a first focus and the vicinity of the entrance of the light guide as a second focus, and a cross section of the exit of the light guide shape, at least a portion relative to the second reflecting surface of the center line, a portion in which a tilt angle that defines the shape of the projected image due to the reflective surface, the center line in a part that is different from the inclined portion parallel or possess a substantially parallel straight portions and, polygonal line open by the inclined portion the straight line portion To provide a vehicle lamp that forms a part, it is to solve the problems as those available characteristics of the optical Den material more than enough.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Below, this invention is demonstrated in detail based on embodiment shown in a figure. Here, in order to facilitate understanding of the operation and effect of the present invention, first, the operation of one end portion 3a of the photoconductive material 3 having the shape of the conventional example will be described. In the vehicular lamp 1, as shown in FIG. 1, the one end 3a (hereinafter referred to as an opening 3a) is parallel to and perpendicular to the center line (optical axis) Z of the reflecting surface 2. Finished as a flat surface, when viewed from above, the front end of the reflecting surface 2 is aligned with the focal point F2. Although not shown, a light source is provided at the other end of the photoconductive material 3, and light is supplied into the photoconductive material 3.
[0008]
Further, in order to obtain a passing beam distribution, the reflecting surface 2 is provided with only a substantially lower half portion of a rotating paraboloidal reflecting surface as shown in FIG. 2, and when viewed from the front shown in FIG. One end 3a is disposed above the focal point F2 of the reflecting surface 2 so that the reflected light faces downward.
[0009]
FIG. 3 shows projection images 3o, 3p, 3q and 3r of the opening 3a by the reflecting surface 2 at points (O to R) indicated by symbols O, P, Q and R in FIG. As shown, the opening 3a is arranged above the focal point F2 of the reflecting surface 2, so that all of the projected images (3o to 3r) are generated below the horizontal line H.
[0010]
Then, the point O and the point P existing in the substantially horizontal direction of the opening 3a are projected without being inclined to the shape of the opening 3a as shown in FIG. In the projected images 3o and 3p, the upper long side is close to the horizontal line H in a substantially parallel manner. On the other hand, the projected images 3q and 3r projected from the point Q and the point R are projected with an inclination by the rotation angle θ from the horizontal of the respective positions Q and R, as shown in FIG. It will be a thing. The difference in image size in the projected images (3o to 3r) is due to the characteristics of the reflecting surface 2 that is a paraboloid.
[0011]
Therefore, the lens cut 4a applied to the lens 4 (see FIG. 1) must be performed in consideration of the shape of the projected image (3o to 3r) at each point (O to R) described above. If a tilted image such as the image 3q or the projected image 3r is generated, the design of the lens cut 4a becomes inevitable, and if a place where light does not reach partially is generated, the light distribution There is a possibility that light unevenness may occur in the characteristics.
[0012]
Therefore, in the inventor of the present invention, as shown in FIG. 4 as an initial trial, the opening 3a is provided with an inclination angle α for horizontally correcting the projected images at the points Q and R as shown in FIG. It was. Actually, since there is an angle difference between the point Q and the point R, the correction is performed at the intermediate point between the two. As the points O to R, the same positions as those shown in FIG. 2 are set, so refer to FIG.
[0013]
FIG. 5 shows the projected images 31 (o to r) at the respective points (O to R) at this time. First, at the point O and the point P existing in the substantially horizontal direction of the opening 31a, the opening is provided. Since the cross-sectional shape of 31a is projected almost as it is, the projected images 31o and 31p shown in FIG. 3A and the projected images 31o and 31p have substantially the same shape, and therefore illustration thereof is omitted here.
[0014]
On the other hand, the projection images 31q and 31r projected from the point Q and the point R have the above correction, so that both of them have a long side substantially above the horizontal line H as shown in FIG. In other words, it was confirmed that the projection images 31o and 31p at the point O and the point P can be very approximated.
[0015]
However, if the projection images 31q and 31r are examined in detail, the projection image 31q does not emit light upward from the horizontal line H and can be used as a passing beam light distribution. It was confirmed that the light slightly rises to the left in the state and generates light above the horizontal line H, in other words, upward light.
[0016]
The present invention has been made through the above examination, and based on the above results, a part of the opening as shown in FIG. 6 (in this embodiment, close to the reflection surface 2 of the opening) is shown. Side) is a straight line portion 32b that is parallel or close to parallel with the center line Z, and the other portions are corrected in the same manner as shown in FIG. 4 to form a sloping portion 32c. The straight portion 32b and the sloping portion 32c A polygonal opening 32a was formed.
[0017]
FIG. 7 shows projected images by the opening 32a, particularly projected images 32q and 32r from the points Q and R where the shapes are remarkably different. The projection image 32q is formed by the above-mentioned polygonal line shape. , 32r are also bent, and the projected image 32r is substantially free from the portion extending upward from the horizontal line H, thereby further improving the suitability for passing beam distribution.
[0018]
Here, in the present invention, the opening is not limited to the above-described shape, and may be, for example, an opening 33a in which straight portions 32b are formed at both ends of the inclined portion 32c as shown in FIG. FIG. 9 shows the projected images 33q and 33r from the point Q and the point R in this case, which is generated in parallel with the horizontal line H, and the suitability for passing beam distribution is further increased.
[0019]
With the above configuration, in the vehicular lamp 1 according to the present invention, the projected image generated from the entire surface of the reflecting surface 2 overlaps with the long side of the rectangle being substantially horizontal without tilting. When optical characteristics are formed, diffusion may be appropriately performed in the horizontal direction and the vertical direction. Further, since there is no gap where light does not reach between the projected images from each position, it is possible to form a light distribution characteristic with extremely uniform brightness without causing light distribution unevenness.
[0020]
FIG. 10 shows an example of a vehicular lamp 10 adopting the configuration of the present invention. The vehicular lamp 10 is provided with a first reflecting surface 12 such as a rotating paraboloid with a light source 11 as a focal point. The first reflecting surface 12 is provided with a light guide path (photoconductive material) 13 extending to the back surface, and further, the opening 13a of the light guide path 13 is set to a substantially focal position outside the first reflecting surface 12. Similarly, a second reflecting surface 14 such as a rotating paraboloid is provided.
[0021]
Further, the top plate portion 12a of the first reflecting surface 12 has a third reflecting surface 15 that is a spheroid having the light source 11 as the first focal point and the light guide path 13 as the second focal point. Is provided, and the light from the light source 11 that is not captured by the first reflecting surface 12 is collected, and reaches the second reflecting surface 14 via the light guide path 13. As a result, the irradiation efficiency can be further improved.
[0022]
At this time, since the light guide path 13 corresponds to the photoconductive material of the present invention, the opening (exit) 13a of the light guide path 13 is inclined with a straight line portion as shown in FIG. As shown in the above description, an optimal light distribution characteristic is obtained. In the figure, the reference numeral 16 denotes a lens, and the reference numeral 16a denotes a lens cut applied to the lens 16.
[0023]
【The invention's effect】
As described above, according to the present invention, the one end portion of the photoconductive material is a vehicular lamp having a portion provided with an inclination angle at least partially with respect to the center line of the reflecting surface. Actively utilizing the flexibility of the shape of the opening of the photoconductive material and superimposing the projected images of the opening from all positions on the reflective surface in the same shape, etc. Optimizes the conditions when forming the lamp, and has excellent light distribution characteristics with an ideal shape and no light unevenness, and has an extremely excellent effect on improving the performance of this type of vehicle lamp It is.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a prototype of a vehicular lamp according to the present invention as viewed from above.
FIG. 2 is an explanatory diagram showing the same prototype process as seen from the front.
FIG. 3 is an explanatory view showing a projected image in the same trial production process.
FIG. 4 is an explanatory view showing the second trial production process of the vehicular lamp according to the present invention as seen from above.
FIG. 5 is an explanatory diagram showing a projected image in a second trial process.
FIG. 6 is an explanatory view showing an embodiment of a vehicular lamp according to the present invention as seen from above.
FIG. 7 is an explanatory diagram showing a projected image of the same embodiment.
FIG. 8 is an explanatory view showing another embodiment of the vehicular lamp according to the present invention as seen from above.
FIG. 9 is an explanatory diagram showing a projected image of another embodiment.
FIG. 10 is a perspective view showing still another embodiment of the vehicular lamp according to the present invention.
FIG. 11 is an explanatory diagram showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 10 ... Vehicle lamp 2 ... Reflecting surface 3 ... Photoconductive material 13a, 32a, 33a ... Opening part (one edge part)
32b: Linear portion 32c: Inclined portions 31o to 33r: Projected image 4, 16: Lens 4a, 16a: Lens cut

Claims (1)

A first reflecting surface of a rotating paraboloid system focused on the light source;
At least one light guide provided at an appropriate position of the first reflecting surface and penetrating to the back side of the first reflecting surface;
A second reflecting surface that is a paraboloidal system focusing on the vicinity of the exit of the light guide;
The first reflecting surface is provided at a position where there is little interference, and includes a third reflecting surface of a spheroidal surface system having the light emitting source as a first focal point and the vicinity of the entrance of the light guide as a second focal point,
The cross-sectional shape of the outlet of the light guide is
A part provided with an inclination angle that defines the shape of a projected image by the reflection surface at least partly with respect to the center line of the second reflection surface, and a part different from the inclination part parallel to the center line or possess a substantially parallel linear portions, forms a polygonal line shaped openings by the inclined portion the straight line portion, the vehicular lamp.

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