JP4103359B2 - Reflector structure for vehicle headlamps - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle headlamp reflector structure that is applied to, for example, a headlight, a fog lamp, and the like and has a reflecting surface divided into a plurality of segments.
[0002]
[Prior art]
In the conventional vehicle headlight reflector structure 100, as shown in FIG. 6, the reflecting surface 2 is formed in a free-form surface having a valve mounting hole 3 at the center, and is mounted in the valve mounting hole 3. The light source bulb 4 is divided into a plurality of segments having different light emission angles.
[0003]
That is, as shown in FIG. 7, the plurality of segments constituting the reflecting surface 2 are a plurality of convex reflecting surfaces A formed continuously at appropriate intervals along the inner surface of the horizontal reference paraboloid S. ~ G. The boundary part 5 of each segment is comprised by the trough part formed in the junction part of adjacent convex reflective surfaces, and is designed so that it may become a perpendicular line by the front view of the reflector structure 100 (FIG. 6). reference).
[0004]
According to the reflector structure 100, the light distribution pattern L shown in FIG. Specifically, the light distribution pattern L is a fog lamp projected on a far screen, and the light distribution pattern L1 formed by the light emitted from the convex reflection surfaces A and G and the convex reflection surfaces B and F are provided. A light distribution pattern L2 formed by the emitted light, a light distribution pattern L3 formed by the emitted light from the convex reflecting surfaces C and E, and a light distribution pattern L4 formed by the emitted light from the convex reflecting surface D It is configured.
[0005]
[Problems to be solved by the invention]
However, the reflector structure 100 has a problem in that there is a limit in expanding the horizontal diffusion width of the light distribution pattern L, and thus the demand for improving the side visibility cannot be achieved. .
[0006]
In addition, in the reflector structure 100, the boundary portion 5 of each segment forms a valley, and therefore, as shown in FIG. 9A, a liquid pool 6 that fills the boundary portion 5 at the time of manufacture appears. There is also a problem that there is a fear.
[0007]
When the liquid pool 6 appears, the diffused light range R2 is, as shown in FIGS. 9 (a) and 9 (b), the both ends of the diffused light range R1 when the liquid pool 6 is not generated are inward by the width r. Since it is formed by returning it, it becomes narrower by that amount, and a portion corresponding to both end portions becomes a light pool R (see FIG. 9B) and is irradiated onto the road surface, which causes a decrease in visibility. In addition, the liquid reservoir 6 may emit uncontrolled light such as light traveling toward the oncoming vehicle, and is not preferable.
[0008]
Therefore, the present invention aims to improve the lateral visibility by expanding the horizontal diffusion width of the light distribution pattern without causing the emission light and the light pool outside the control range due to the boundary portion of each segment. An object of the present invention is to provide a reflector structure for a vehicle headlamp that can be used.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the reflecting surface is formed in a free-form surface having a valve mounting hole at a central portion, and the light of the light source bulb mounted in the bulb mounting hole. A vehicle headlamp reflector structure formed by dividing into a plurality of segments having different emission angles,
The plurality of segments are composed of a plurality of convex reflection surfaces and concave reflection surfaces that are alternately continued in the horizontal direction,
The convex reflecting surface is intermittently formed at appropriate intervals along the inner surface of the horizontal reference paraboloid,
The concave reflecting surface is drawn so as to connect the convex reflecting surfaces on both sides along the outer surface of the reference paraboloid at an intersection angle smaller than the intersection angle of the convex reflection surface and the reference paraboloid surface, and It is formed along the line drawing at a position where the line drawing is offset backward, and a boundary portion between the convex reflection surface and the concave reflection surface sets a connecting width in the left-right direction centering on the offset position. A gentle slope extending in the left-right direction passing through a substantially intermediate point of the offset width and intersecting the reference paraboloid at an intersection angle greater than the intersection angle of the convex reflecting surface and the reference paraboloid. The connecting reflection surface is formed by continuously forming the convex reflection surface and the concave reflection surface between the connection widths.
[0010]
For this reason, according to the first aspect of the present invention, when the light source bulb is turned on, open diffusion outgoing light is obtained from the convex reflection surface, and cross diffusion outgoing light is obtained from the concave reflection surface.
[0011]
Also, when the intersection angle between the convex reflection surface and the reference paraboloid is α, the intersection angle between the concave reflection surface and the reference paraboloid is β, and the intersection angle between the kazana reflection surface and the reference paraboloid is γ. , Γ>α> β is established, and based on this relationship, the light emitted from the connecting reflection surface becomes a large diffusion pattern that exceeds the convex reflection surface and each emission range from the concave reflection surface.
[0012]
The boundary between the convex reflecting surface and the concave reflecting surface is a connecting reflecting surface formed by extending a gentle slope in the left-right direction, and the convex reflecting surface and the concave reflecting surface are continuously formed. Therefore, there are no projections for diffusing light, valleys or steps for generating liquid pools, etc. in the connecting reflection surface, and the emitted light from this part is emitted outside the control range. It can be ensured as being within the control range without any light accumulation.
[0013]
The invention according to claim 2 is the vehicle headlamp reflector structure according to claim 1,
The boundary part is designed to be vertical in a front view of the reflecting surface.
[0014]
For this reason, in the invention described in claim 2, since the connecting reflection surface is formed to extend on both the left and right sides of the vertical boundary portion, the emission angle in the left and right side directions can be efficiently expanded.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, what shows the same function as what is shown in FIGS. 6-9 is attached | subjected and demonstrated with the same code | symbol.
[0016]
1 and 2 show a vehicle headlamp reflector structure 1 according to an embodiment of the present invention. FIG. 1 is a front view of the reflector structure 1, and FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.
[0017]
The reflector structure 1 is applied to a fog lamp, and a reflecting surface 2 is formed in a free-form surface having a bulb mounting hole 3 at a central portion, and a light source bulb 4 mounted in the bulb mounting hole 3. The light is divided into a plurality of segments having different light emission angles. The free-form surface at this time is formed on the basis of a rotating paraboloid as shown by a broken line S in FIG.
[0018]
The plurality of segments are configured by vertically long convex reflection surfaces A to G and concave reflection surfaces a to f that are alternately continuous in the horizontal direction. That is, the concave reflective surface a is between the convex reflective surfaces A and B, the concave reflective surface b is between the convex reflective surfaces B and C, and the concave reflective surface c is between the convex reflective surfaces C and D. d is formed between the convex reflecting surfaces D and E, the concave reflecting surface e is formed between the convex reflecting surfaces E and F, and the concave reflecting surface f is formed between the convex reflecting surfaces F and G, respectively.
[0019]
Moreover, the boundary part of each convex reflective surface and concave reflective surface is comprised by the connection reflective surface 7, and both ends of this connection reflective surface 7 are each convex reflective surface A (B, C, D, E). , F, G) and the concave reflecting surface a (b, c, d, e, f).
[0020]
Specifically, the plurality of segments are formed as follows.
[0021]
First, the convex reflecting surfaces A, B, C, D, E, F, and G are intermittently formed at appropriate intervals along the inner surface of the horizontal reference paraboloid S.
[0022]
Next, the concave reflective surfaces a, b, c, d, e, and f are formed between the two corresponding convex reflective surfaces. This formation process will be described in relation to the convex reflection surface C and the concave reflection surface c shown in FIG.
[0023]
That is, in the first design stage of the concave reflecting surface c, as shown in FIG. 4 (a), the reference paraboloid S has an intersection angle β smaller than the intersection angle α between the convex reflecting surface C and the reference paraboloid S. A line c1 is drawn so as to connect the convex reflecting surface C along the outer surface. In the second design stage, as shown in FIG. 4B, the line drawing c1 is offset backward (offset width h). The concave reflection surface c is formed along the line c1 at the offset position.
[0024]
Further, the boundary portion between the convex reflecting surface C and the concave reflecting surface c at this time has a connecting width H in the left-right direction centered on the offset position (shown by a straight line o) as shown in FIG. A gentle slope that intersects the reference paraboloid S at the intersection angle γ that passes through the substantially intermediate point h1 of the offset width h and that is larger than the intersection angle α between the convex reflection surface C and the reference paraboloid S is set in the horizontal direction. The convex reflection surface C is formed by extending the projection surface C, and the convex reflection surface C and the concave reflection surface c between the connection widths H are continuously formed. That is, the connecting reflection surface 7 has one end 7 a continuous with the convex reflection surface C and the other end 7 b continuous with the concave reflection surface c. The crossing angle γ of the connecting reflecting surface 7 is larger than the crossing angle α of the convex reflecting surface C and the crossing angle β of the concave reflecting surface c, and the relationship of γ>α> β is established.
[0025]
One design example at this time is as follows. That is, as shown in FIG. 3, the convex reflection surface C is formed with a horizontal reference width M (= 20 mm) and a radius of curvature R1 (= 100 mm), and the concave reflection surface c is a horizontal reference width. The width is m (= 8 mm), the radius of curvature is r (= 15 mm), and the convex reflecting surface D has a horizontal reference width of M (= 20 mm) and a radius of curvature R2 (= 75 mm). Is formed.
[0026]
Further, as shown in FIGS. 3 and 4, the connecting reflection surface 7 is designed with an offset width h of 0.5 mm and a connecting width H of 3 mm.
[0027]
According to the reflector structure 1 configured as described above, the light emitted from the convex reflection surfaces A, B, C, D, E, F, and G is obtained by turning on the light source bulb 4, and the exit diffused light is obtained. From the concave reflecting surfaces a, b, c, d, e, and f, cross-diffused outgoing light is obtained. That is, as shown in FIG. 3, the light emitted from the half of the convex reflection surface C from the concave reflection surface c becomes the emission range LC (= 31 °), and from the concave reflection surface c of the convex reflection surface D. The light emitted from the half of the light becomes the emission range LD (= 37 °), and the light emitted from the concave reflection surface c becomes the emission range Lc (= 48 °).
[0028]
Further, the light emitted from the connecting reflection surface 7 is projected on the convex reflection surfaces A, B, C, D, E, F, G, and the concave reflection surfaces a, b, c, based on the relationship of γ>α> β. It becomes a large diffusion pattern exceeding each emission range from d, e, and f. That is, as shown in FIG. 3, the outgoing light from the maximum inclined portion of the joint reflection surface 7D near the convex reflection surface D out of the joint reflection surfaces 7 on both sides of the concave reflection surface c is an emission range L7D (= 63 And the outgoing light from the maximum inclined portion of the connecting reflective surface 7C near the convex reflective surface C on the other side is an outgoing range L7C (= 56 °).
[0029]
Moreover, according to the reflector structure 1, the light distribution pattern L shown in FIG. Specifically, the light distribution pattern L is a fog lamp projected on a far screen, and the light distribution pattern L1 formed by the light emitted from the convex reflection surfaces A and G and the convex reflection surfaces B and F are provided. A light distribution pattern L2 formed by the emitted light, a light distribution pattern L3 formed by the emitted light from the convex reflecting surfaces C and E, a light distribution pattern L4 formed by the emitted light from the convex reflecting surface D, It is formed by the light distribution pattern L5 formed by the light emitted from the concave reflective surfaces a and f, the light distribution pattern L6 formed by the light emitted from the concave reflective surfaces b and e, and the light emitted from the concave reflective surfaces c and d. And a light distribution pattern L7.
[0030]
According to this light distribution pattern L, among the light distribution patterns L1 to L7 of the constituent elements, the light distribution pattern L7 is largely diffused due to the connecting reflection surfaces 7 formed on both sides of the respective concave reflection surfaces c and d. Thus, the side visibility can be improved.
[0031]
In addition, among the light distribution patterns L1 to L7 of the constituent elements, the light distribution patterns L5 and L6 are formed as those within the basic pattern (see the light distribution pattern L in FIG. 8), but each concave reflection surface a, f, Due to the connecting reflection surfaces 7 formed on both sides of b and e, the outgoing light at the boundary portions with the respective convex reflection surfaces A, G, B, and F is extended sideways to blur light spots and the like. In this respect, lateral visibility can be improved.
[0032]
Further, the boundary portion between the convex reflecting surface (for example, convex reflecting surface C) and the concave reflecting surface (for example, concave reflecting surface c) is a connecting reflecting surface formed by extending a gentle slope in the left-right direction. 7, the convex reflection surface C and the concave reflection surface c are configured to be continuous. Therefore, in the connection reflection surface 7, projections for diffusing light, valleys or steps for generating a liquid pool, and the like. Therefore, the emitted light from this part can be ensured as being within the control range without being accompanied by the emitted light or light pool outside the control range.
[0033]
Preferably, in the reflector structure 1, as in the present embodiment, the convex reflecting surface A (B, C, D, E, F, G) and the concave reflecting surface a (b, c, d, e, f) are used. ) Is designed to be vertical in the front view of the reflecting surface 2 (FIG. 1). Here, the boundary portion is indicated by an offset position o.
[0034]
In this configuration, since the connecting reflection surface 7 is formed to extend on both the left and right sides of the vertical boundary portion (offset position o), it is possible to efficiently increase the emission angle in the left and right side directions. The light distribution pattern L that is greatly diffused in the left and right side directions can be easily formed, and as a result, the side visibility can be further improved.
[0035]
Further, the connecting reflection surface 6 is designed in various ways as necessary. For example, when the offset width h is fixed, as the connecting width H is increased, the degree of inclination of the reflecting surface 7 is weakened, and the extension to the left and right sides is also weakened accordingly. Thus, it contributes to the improvement of luminance. On the contrary, when the connecting width H is fixed, the degree of inclination of the reflecting surface 7 increases as the offset width h increases, and the extension of light to the left and right sides increases accordingly.
[0036]
In the above embodiment, the fog lamp has been described. However, the present invention is not limited thereto, and it is needless to say that the present invention is also applicable to a normal head lamp. In the case of a headlamp, for example, the reflection surface is divided into a large diffusion control surface, a medium diffusion control surface, a 15 ° cut control surface, a horizontal cut control surface, and a traveling beam control surface, and a plurality of control surfaces are provided. The plurality of segments are formed in such a manner that convex reflection surfaces and concave reflection surfaces are alternately continued. At this time, the connecting reflection surface is formed at a boundary portion between the convex reflection surface and the concave reflection surface.
[0037]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, it is formed by extending in the left-right direction a gentle slope whose intersection angle with the reference paraboloid is larger than the convex reflection surface or the concave reflection surface. Since the boundary portion between the convex reflection surface and the concave reflection surface is formed by the rugged reflection surface, the light distribution pattern is not accompanied by the occurrence of light out of the control range and light accumulation due to the boundary portion of each segment. Thus, it is possible to provide a vehicle headlamp reflector structure that can improve lateral visibility by expanding the horizontal diffusion width of the vehicle.
[0038]
According to the second aspect of the present invention, since the connecting reflection surface is formed to extend on both the left and right sides of the vertical boundary portion, in addition to the effect of the first aspect of the invention, The emission angle can be expanded efficiently.
[Brief description of the drawings]
FIG. 1 is a front view of a vehicle headlamp reflector structure according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a locus of a surface of a reflecting surface based on a cross section taken along line II-II in FIG.
FIG. 3 is an enlarged optical path tracking explanatory view of a portion P in FIG. 2;
FIGS. 4A, 4B, and 4C are explanatory diagrams of a design process of a connecting reflection surface according to the present invention.
FIG. 5 is a graph showing a passing light distribution pattern of the present invention.
FIG. 6 is a front view of a conventional vehicle headlight reflector structure.
7 is an explanatory diagram showing a locus of the surface of the reflecting surface based on a cross section taken along line VII-VII in FIG.
FIG. 8 is a graph showing a passing light distribution pattern of a conventional vehicle headlight reflector structure.
FIGS. 9A and 9B are explanatory diagrams for explaining problems of a conventional vehicle headlight reflector structure. FIGS.
[Explanation of symbols]
1 Reflector structure (Vehicle headlight reflector structure)
2 Reflecting surface 3 Bulb mounting hole 4 Light source bulb 7 Connecting reflecting surface A, B, C, D, E, F, G Convex reflecting surface a, b, c, d, e, f Concave reflecting surface H Connecting width h Offset Width h1 Intermediate point o Offset position S Reference paraboloid α, β, γ Intersection angle

Claims (2)

The reflection surface is formed in a free-form surface having a bulb mounting hole in the central portion, and is divided into a plurality of segments having different light emission angles of the light source bulb mounted in the bulb mounting hole. A vehicle headlamp reflector structure,
The plurality of segments are composed of a plurality of convex reflection surfaces and concave reflection surfaces that are alternately continued in the horizontal direction,
The convex reflecting surface is intermittently formed at appropriate intervals along the inner surface of the horizontal reference paraboloid,
The concave reflecting surface is drawn so as to connect the convex reflecting surfaces on both sides along the outer surface of the reference paraboloid at an intersection angle smaller than the intersection angle of the convex reflection surface and the reference paraboloid surface, and It is formed along the line drawing at a position where the line drawing is offset backward, and a boundary portion between the convex reflection surface and the concave reflection surface sets a connecting width in the left-right direction centering on the offset position. A gentle slope extending in the left-right direction passing through a substantially intermediate point of the offset width and intersecting the reference paraboloid at an intersection angle greater than the intersection angle of the convex reflecting surface and the reference paraboloid. A reflector structure for a vehicle headlamp, wherein the connecting reflecting surface is formed by connecting the convex reflecting surface and the concave reflecting surface between the connecting widths. The vehicle headlamp reflector structure according to claim 1,
The vehicle headlamp reflector structure is characterized in that the boundary portion is designed to be vertical in a front view of the reflecting surface.

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