JPH02220301A - Headlamp for automobile - Google Patents

Abstract

PURPOSE:To eliminate the loss of light that is blocked off by a douser by making the lower part under the douser, when seen from the front, of a projection reflecting surface, a diffusion reflecting part where the reflected light therefrom is diffused in a horizontal direction, while it is irradiated parallel to an irradiation axis or along a sheath downward in a vertical direction. CONSTITUTION:An upper reflecting surface 13 is composed of a diffusion reflecting part 19 of lower part and a convergence reflecting part 20. The diffusion reflecting part 19 has a horizontal cross section of ellipse, and a vertical cross section of parabola, where a first focal point of the ellipse and a focal point of the parabola are common, which is located at the same point as a focal point F13 of the projection reflecting surface 13. An axis of the ellipse and that of the parabola are also common, which is defined as parallel to an irradiation axis X-X or slightly down in the front part. The light that is emitted from a light source arranged at the focal point F13 and that is reflected at the diffusion reflecting part 19 is irradiated parallel to the irradiation axis X-X or slightly downward in the front part, and in a horizontal direction, is irradiated so as to be diffused after converged once at a second focal point of the ellipse. The loss of the light that is shut off by the lower face of the douser can thus be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The vehicle headlamp of the present invention will be described in detail according to the following items.

A. Industrial field of application B1 Overview of the invention C1 Prior art 9 Problems to be solved by the invention [Figures 18 to 20
[Figure] E1 Means F for solving the problem, Example [Figures 1 to 17] a. Outline b Light bulb C1 reflector c-1, upper reflective surface c-2, lower reflective surface c-3, Left and right inner reflective surfaces c-4, left and right outer reflective surfaces C-5, filament position d, light shielding plate e, projection lens f, cover lens g, light distribution pattern g-1, light distribution pattern of passing beams g-1- A. Light distribution pattern without a cover lens g-1-Light distribution pattern through the cover lens g-2, Light distribution pattern of traveling beam g-2-A. Light distribution pattern without a cover lens g- 2-Another example of a light distribution pattern h transmitted through a cover lens and a diffuse reflection part [Figures 15 to 17] G6 Effects of the invention (A, industrial application field) The present invention is a novel vehicle application. Regarding headlights. Specifically, it is a vehicle headlamp that has a projector-type optical system above the irradiation axis, and the light that is reflected from the light emitting and reflecting surface of the optical system is blocked by the lower surface of the light shielding plate and is lost. The purpose of the present invention is to provide a new vehicle headlamp that can effectively utilize light by eliminating this problem.

(B. Summary of the Invention) The vehicle headlamp of the present invention has a so-called projector type optical system, that is, a light projecting and reflecting surface that reflects light from a light source and focuses it on a focusing position in front, and a front end. Irradiates an optical system consisting of a light-shielding plate arranged horizontally so that the light-shielding edge is located near the light-converging position, and a projection lens located in front of the light-shielding plate and whose focal point is located at the light-shielding edge. A vehicle headlamp located above the shaft, in which a portion of the light emitting and reflecting surface located below the light shielding plate when viewed from the front is used to diffuse the reflected light from that portion in the horizontal direction and to irradiate it in the vertical direction. As a diffuse reflection part that emits light parallel to the axis or slightly downward, it is possible to use the light that has been obstructed by the light shielding plate out of the light reflected by the projection reflection surface as an effective light beam without being obstructed by the light shielding plate.

(C, Prior Art) There is a so-called projector-type vehicle headlamp that applies the principle of a projector.

In accordance with the design of the vehicle body to improve high-speed performance of the vehicle, vehicle headlights must be made narrower by reducing the vertical width, and the cover lens must also be tilted significantly to match the shape of the vehicle body. There is.

However, it is possible to create a parallel light beam using a commonly used paraboloid of revolution reflector, and control the parallel light beam with a vertically extending cylindrical prism step formed on a cover lens to achieve the desired light distribution. A vehicle headlamp designed to obtain a pattern cannot cope with the narrowing of the width and the inclination of the cover lens.

In other words, in the case of a paraboloid of revolution reflector, the number of emitted light fluxes depends on the size of its projection and reflection surface, so by narrowing the width, the number of emitted light fluxes decreases, and the absolute amount becomes insufficient. I'll come. Furthermore, when light is diffused by a cylindrical prism step, if the prism step is tilted, both ends of the diffusion pattern will move upward (if the front is tilted) or downward (if the prism step is tilted downward). There is a problem in that the light distribution pattern is distorted due to the curve.

Therefore, a projector type vehicle headlamp has been proposed, and this type of vehicle headlamp consists of a reflector having a convergence point or condensing part for reflected light, and a condensing point or condensing part for reflected light. The light distribution pattern is formed by the light shield whose light shielding edge is located in the light part and the projection lens that projects the light at the light shielding edge position forward, so there is almost no need to shape the light distribution pattern with a cover lens, and the cover Even if the lens is tilted, this has almost no effect on the light distribution pattern, and since the light focused on the light condensing point or condensing part is projected by the projection lens, the front surface is the exit surface. Even if the vertical width becomes smaller, the number of emitted light beams is not affected, and a sufficient number of emitted light beams can be ensured.

Therefore, attempts have been made to combine a projector-type optical system having such advantages on the upper side to obtain a light distribution pattern close to the ideal.

(D. Problems to be Solved by the Invention) [Figures 18 to 20] By the way, in the case of a projector-type optical system that is combined above the irradiation axis, in the projector-type optical system, There is a problem that light loss occurs.

In Figures 18 and 19, XX is the irradiation axis of the headlamp, a is the light emitting reflection surface, b is the light source located on the irradiation axis XX, C is the condensing position, and all the light sources are Light emitted from reflective surface a
The light reflected by is focused on the focusing position C. d is a plate-shaped light-shielding plate, and its front edge e serves as a light-shielding edge.

The light shielding plate d has its light shielding edge e at the light converging position C.
It is located near the irradiation @X-X and is placed substantially horizontally above the irradiation @X-X.

f is a projection lens arranged in front of the light-shielding plate d so that its tip axis XX is approximately parallel to the irradiation axis X-X, and its focal point Ff is approximately at the center of the light-shielding edge e. positioned.

In such a projector type optical system,
The light reflected by the portion g of the light projecting and reflecting surface a below the light shielding plate d when viewed from the front becomes lost light that is blocked by the light shielding plate d and is not emitted forward.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the vehicle headlamp of the present invention has a light projecting and reflecting surface that reflects light from a light source and focuses the light on a focusing position in front. an optical system comprising: a light-shielding plate disposed horizontally such that a light-shielding edge at its front end is located near the light-converging position; and a projection lens located in front of the light-shielding plate and having its focal point on the light-shielding edge. A vehicle headlamp having a light beam above the irradiation axis, in which a portion of the light emitting reflection surface located below the light shielding plate when viewed from the front is used to diffuse the reflected light from that portion in the horizontal direction and in the vertical direction. In this case, a diffuse reflection part is used that emits light parallel to the irradiation axis or slightly downward.

Therefore, in the vehicle headlamp of the present invention, the light reflected by the diffuse reflection part of the light projecting reflection surface is irradiated parallel to the irradiation axis or downwardly, so it is eclipsed by the light shielding plate and is lost. Therefore, the luminous flux can be used effectively.

(F. Embodiment) [Figs. 1 to 17] Details of the vehicle headlamp of the present invention will be described below according to the illustrated embodiment.

(A, Overview) Reference numeral 1 denotes a vehicle headlight, which includes a reflector ut2, a light bulb 3, a cover lens 4 that covers the front of the reflector 2, and a light shielding plate 5 for creating a cutoff line in the light distribution pattern of the passing beam. A projection lens 6 is provided for projecting the light beams cut by the light shielding plate 5 forward.

(b, Light Bulb) As a light source, a European standard so-called H4 type light bulb 3 is used in this embodiment.

The light bulb 3 includes a glass bulb 7, a cap 8 attached to the rear end of the glass bulb 7, two filaments 9 and 10 sealed in the glass bulb 7, and a light-shielding cap covering approximately the lower half of one of the filaments 10. 11, and a light-shielding paint 12 is attached to the front end of the glass bulb 7. The two filaments 9 and 10 each have a coil shape and are arranged so as to extend along the axis of the glass bulb 7, with a filament 10 arranged in front of the filament 9.

The light shielding cap 11 shields the low beam filament 10 from substantially the lower half of the reflecting surface of the reflecting mirror 2, which will be described later. Therefore, the light from the low beam filament 10 is reflected on the road half of the reflective surface. Only the light that is emitted is emitted forward.

Further, the light shielding paint 12 applied to the front end of the glass bulb 7 of the light bulb 3 shields each filament 9, 10 from the front.

(c, Reflection! Reflection fi2 is equipped with a concave reflecting surface facing forward, and this reflecting surface is divided into a plurality of parts.The reflecting mirror 2 passes through the center of the reflecting mirror 2 and faces directly. In other words, the axis extending straight forward is called the irradiation axis and is indicated by XX.

The reflecting mirror 2 has a substantially horizontally long rectangular shape with a small vertical width and a large horizontal width when viewed from the front.

The reflective surface is divided radially into four parts, excluding approximately one-fourth of the area at both the left and right ends, each of which is approximately fan-shaped, including an upper reflective surface 13, a lower reflective surface 14, and an inner left reflective surface. 15 and a right inner reflective surface 16. still,
Here, the left and right directions are shown as facing forward, and the same applies to the case where the left and right directions are shown below.

Approximately one-fourth of each of the above-mentioned left and right ends is used as a left outer reflecting surface 17 and a right outer reflecting surface 18.

(c-1, Upper Reflection Surface) This upper reflection surface 13 is the light projecting reflection surface in the present invention, and is composed of the lower diffuse reflection section 19 and the other condensing reflection section -〇.

This light emitting reflection surface 13 has its focus Fus on the irradiation axis X
- have on X.

The condensing reflector 20 has a surface ξ having a condensing position 21 above the irradiation axis XX. That is, the light emitted from the light source disposed at the focal point FI3 and reflected by the reflective surface 20 is condensed at the condensing position 21.

In this embodiment, the light condensing position 21 is a curved line that extends substantially horizontally and has both ends located forward of the center when viewed from above. Note that this curvature is caused by the projection lens 6
It is preferable to use one that is compatible with the curvature of field.

An example of a reflective surface that can be used as the light condensing and reflecting section 20 is the reflective surface shown in Japanese Patent Application No. 86437/1983.

The diffuse reflection section 19 has a surface that forms an ellipse in the horizontal cross section and a parabola in the vertical cross section, and the first focal point of the ellipse and the focal point of the parabola are common and the same as the focal point F13 of the light emitting reflection surface 13. Located at the point. Furthermore, the axis of the ellipse and the axis of the parabola are also common, and the axis is parallel to the irradiation axis x-x or slightly inclined forward.

Therefore, the light emitted from the light source disposed at the focal point F13 and reflected by the diffuse reflection section 19 is irradiated parallel to the irradiation axis XX or slightly forward and downward, and in the horizontal direction, the light is emitted from the elliptical second focal point. Once the light is focused, it is irradiated in a diffused manner.

(c-2, lower reflective surface) The focal point F14 of the lower reflective surface 14 is the focal point F of the upper reflective surface 13.
13 (on the top side of the reflecting mirror 2), the first light collection position intersects the irradiation axis x-X and becomes a straight line 22 extending horizontally, and the second light collection position is the first light collection position 22. The reflection surface forms a straight line 23 that intersects with the irradiation axis XX further forward and extends perpendicularly.

Therefore, the light emitted from the light source disposed at the focal point F14 and reflected by the reflecting surface 14 first reaches the first condensing position 22.
The light is then focused at a second focusing position 23.

Incidentally, the above-mentioned patent application 1986-8 also applies to such a reflective surface 14.
The reflective surface shown in the '6437 patent application can be applied. In this case, each parameter of the equation of the reflecting surface may be determined so that the first and second light condensing positions are the straight lines 22 and 23.

(c-3, left and right inner reflecting surfaces) The left and right inner reflecting surfaces 15 and 16 are surfaces that reflect the light emitted from the light source placed at the focal point FIS and F1a, converge it in the left and right directions, and then diffuse it. and its focus F
18% F16 is located between the focal point F13 of the upper reflective surface 13 and the focal point F14 of the lower reflective surface 14.

For such a reflection WJ15.16, the first light collection position is a straight line 24.25 extending vertically, and the second light collection position in front of it is a straight line 26.27 extending horizontally.For example, This can be obtained by setting each parameter of the equation of the reflecting surface as desired in the above-mentioned Japanese Patent Application No. 63-86437. In this case, the reflective surface 15.
By determining the size of the light beam 16 and the position of the first condensing position 24, 25, the angle of diffusion of the light in the horizontal direction can be freely selected. For example, the closer the first focusing position 24.25 is to the reflection fi2, the larger the diffusion angle in the horizontal direction becomes, and the farther the second focusing position 26.27 is from the reflecting mirror 2, the more parallel the luminous flux becomes in the vertical direction. It becomes close to. In addition, in order to obtain parallel luminous flux in the vertical direction, for example, patent application No. 63-199
The reflective surface (7) shown in the first embodiment of the '514 patent application
) and (8) may also be used.

Furthermore, as the reflective surfaces 15 and 16 of this part, the
It is also possible to apply the reflective surface shown in patent application No. 3-82759.

(c-4, left and right outer reflective surfaces) The left and right outer reflective surfaces 17 and 18 both form a paraboloid of revolution,
Its optical axis is approximately the same as the irradiation @X-X, and its focal point is approximately at the same position as the focal point FI4 of the lower reflective surface 14.

(Position of C-5 filament) Therefore, in the light bulb 3, the center of the main filament 9 is located at the focal point FI4 of the lower reflective surface 14, and the sub-filament]
It is arranged so that the center of O is located at the focal point F13 of the upper reflective surface 13.

(d. Light-shielding plate) The light-shielding plate 5 has a substantially plate shape, and its front edge 28 serves as a light-shielding edge.

The light-shielding plate 5 is disposed approximately horizontally at the boundary between the diffuse reflection section 19 and the condensing reflection section 20 of the upper reflection surface 13 when viewed from the front above the irradiation axis XX, and its light-shielding edge 28 serves as an upper reflection Side 1
It is located near the light condensing position 21 of No. 3, and cuts a part of the light gathering at that position. The light-shielding edge 28 is curved to match the curvature of field of the projection lens 6, so that the projected image by the projection lens 6 is projected onto the light-shielding edge 28.
A clearly expressed cutoff line is projected from the center of 8 to both ends.

The shape of the light-shielding edge 28 when viewed from the front is adapted to a desired cut-off line in the light distribution pattern of the passing beam.

The upper surface 29 of the light shielding plate 5 is made into a reflective surface by vapor deposition means or the like. As a result, the light incident on the upper surface 29 of the light shielding plate 5 is reflected by the upper surface 29 and enters the upper half of the projection lens 6, and the light not cut by the light shielding plate 5 is transmitted to the lower half of the projection lens 6. Since the light incident on the entire projection lens 6 is projected as the sum of the light incident on the projection lens 6
Color fringing due to chromatic aberration is prevented from appearing along the periphery of the light distribution pattern, particularly along the cut-off line, and the luminous flux is effectively utilized.

Reference numeral 30 denotes a shielding portion vertically disposed from the center of the front edge of the light shielding plate 5, and the shielding portion 30 prevents light from entering the projection lens 6 from below the light shielding plate 5.

The rear edge 31 of the light shielding plate 5 is connected to the rear end of the main filament 9 and the reflection f
It is located slightly behind the line connecting the upper opening edge of the reflective surface of i2 (the connecting part continuous with the upper plane 2a), and has a shape that prevents the light from directly hitting the upper plane 2a. .

(e, Projection Lens) The projection lens 6 is a condensing lens in the shape of a convex lens, and its optical axis XX extends above and parallel to the irradiation axis xx, and is located in front of the light shielding plate 5. It is arranged so that the focal point Fa is located at the center of the light shielding edge 28.

(f. Cover Lens) The cover lens 4 is disposed in front of the reflecting mirror 2 so as to cover its front opening from the front. Further, the cover lens 4 is tilted downward toward the front.

The entire cover lens 4 is divided into six parts.

The portion 32 is provided corresponding to the projection lens 6, and is a portion into which the light projected by the projection lens 6 enters.This portion 32 has almost no lens elements formed therein, and may be referred to as a so-called transparent portion. It is a part.

The portion 33 is provided corresponding to the lower reflective surface 14 and is a portion into which the light reflected by the reflective surface 14 is incident, and is a prism step 3 for concentrating the light at the center of the light distribution pattern.
4.34, . . . are formed. It also has a slight diffusion function to the left and right.

The portion 35 corresponds to the left inner reflective surface 15, and the portion 3
Reference numeral 6 denotes a portion corresponding to the right inner reflecting surface 16, on which the light reflected by the respective reflecting surfaces 15 and 16 enters, and a lens step is formed so as not to greatly distort the light.

The portion 37 corresponds to the left outer reflective surface 17, and the portion 3
Reference numeral 8 denotes a portion corresponding to the right outer reflecting surface 18, into which light reflected by the respective reflecting surfaces 17 and 18 enters and forms the center of the light distribution pattern.

(g. Light Distribution Pattern) Next, the light distribution pattern of each beam irradiated by the vehicle headlamp 1 will be explained by dividing it into a light distribution pattern of a passing beam and a light distribution pattern of a running beam.

(g-1, light distribution pattern of passing beams) (8-1-
B. Light distribution pattern without cover lens) FIG. 13(A) shows the light distribution pattern 39 when the sub-filament 10 is turned on and the light does not pass through the cover lens 4.

In the light distribution pattern 39, reference numeral 40 denotes a light distribution created by the collection of light reflected by the condensing reflector 20 of the upper reflective surface 13 at the light shielding edge 28 position and the shape of the light shielding edge 28 being projected by the projection lens 6. This portion forms the approximate outline of the light distribution pattern of the passing beam. The upper edge 41 of the light distribution portion 40 is a cutoff line onto which the light shielding edge 28 of the light shielding plate 5 is projected.

Reference numeral 42 denotes a light distribution portion of the light reflected by the diffuse reflection portion 19 of the upper reflective surface 13, and this is the case where the glaze of the diffuse reflection portion 19 is slightly tilted forward, which is different from the light distribution portion 40.
It is located so that it extends from left to right along the lower edge of the .

43 is a light distribution portion due to the light reflected by the left inner reflective surface 15, and 44 is a light distribution portion due to the light reflected by the right inner reflective surface 16. Note that the shape of these light distribution portions 43 and 44 is shaped like a waxing moon because the light directed toward approximately the lower half of the reflective surface 15 and 16 out of the light emitted from the sub-filament 10 is blocked by the light-shielding cap 11. This is because it has been done. The upper edge 44a of the light distribution portion 44 is tilted upward to the left because the right shoulder of the light shielding cap 11 of the H4 bulb 3 is located at a slightly lower position than the left shoulder.

45 is a light distribution portion due to the light reflected by the left outer reflective surface 17, and 46 is a light distribution portion due to the light reflected by the right outer reflective surface 18. Since light does not reach substantially the lower half of these reflective surfaces 17 and 18, and the right shoulder of the light shielding cap 11 is located slightly lower than the left shoulder, the upper 1i of the light distribution portion 46
46 a is inclined upward to the left.

As can be seen from the above, the light distribution portion 40 forms the entire outline of the light distribution pattern, the light distribution portions 43 and 44 are located at the center of the light distribution pattern to form a high luminous intensity band, and the light distribution portion 45 and 46 are directed toward the center of the light distribution pattern to form the highest luminous intensity zone, the so-called hot zone. Furthermore, the light distribution portion 42 sufficiently illuminates the road in front of the road, especially the road shoulder area.

In this way, a light distribution pattern 39 that is substantially sufficient as a light distribution pattern for a passing beam can be obtained without requiring the cover lens 4, and this light distribution pattern 39 is slightly shaped by the cover lens 4 to create a light distribution pattern for a passing beam.

(g-1-Port, Light Distribution Pattern Through Cover Lens) Reference numeral 47 shown in FIG. 13(B) is a light distribution pattern obtained when the light distribution pattern 39 is transmitted through the cover lens 4.

48, the light that becomes the light distribution part 40 mentioned above is the cover lens 4.
This is the light distribution portion obtained by passing through the portion 32 of the light distribution pattern 47, and forms the entire outline of the light distribution pattern 47.

49, the light forming the above-mentioned light distribution pattern 42 is connected to the cover lens 4.
This is a light distribution portion obtained by passing through the portion 33 of the light distribution portion 48, and extends in the left-right direction along the lower edge of the light distribution portion 48 to illuminate the road shoulder in front of the road.

Reference numeral 50 denotes a light distribution portion formed by the light forming the above-mentioned light distribution portions 43 and 44 passing through the portions 35 and 36 of the cover lens 4 and being slightly diffused in the left and right direction. It forms a high luminosity zone.

Reference numeral 51 denotes a light distribution portion formed by the light distribution portions 45 and 46 being slightly expanded inward by passing through the portions 37 and 38 of the cover lens 4, and forming a hot zone of the light distribution pattern 47.

In this way, a sufficient amount of light can be secured even if the vertical width is small, and even if the cover lens 4 is tilted, the light distribution pattern 47 is hardly affected by it. At the same time, it is possible to sufficiently illuminate the area in front of the road all the way to the shoulder.

(g-2, light distribution pattern of traveling beam) (g-2-i,
(Light distribution pattern without cover lens) Figure 14 (A) shows the light distribution pattern when the main filament 9 is turned on.
Moreover, it shows the light distribution pattern 52 in a state where the light does not pass through the cover lens 4.

Reference numeral 53 denotes a light distribution portion formed by the light reflected by the condensing reflector 20 of the upper reflective surface 13, and the light distribution pattern 52
Forms a part that extends from side to side below. Reference numeral 54 denotes a light distribution portion by the light reflected by the diffuse reflection section 19.

55 is a light distribution portion formed by the light reflected by the lower reflective surface 14, and is a vertically long pattern with the lower end located in the center.

56 is a light distribution portion due to the light reflected by the left inner reflective surface 15, and 57 is a light distribution portion due to the light reflected by the right inner reflective surface 16. These light distribution portions 56 and 57 have a horizontally long pattern with their respective inner ends located at the center.

Reference numeral 58 denotes a light distribution portion formed by the light reflected by the left and right outer reflecting surfaces 17 and 18, and is directed toward the center.

(g-2-Port, Light distribution pattern transmitted through cover lens) When the light distribution pattern 52 described above is transmitted through the cover lens 4, it becomes a pattern 59 shown in FIG. 14(B).

60, the light that becomes the light distribution portion 53 described above is connected to the cover lens 4.
Since the portion 32 of the cover lens 4 has almost no lens function, it has substantially the same pattern as the light distribution portion 53 described above. Reference numeral 61 denotes a light distribution portion obtained by the light forming the above-mentioned light distribution portion 54 passing through the portion 33 of the cover lens 4.

62 is bent slightly downward so that the center of the pattern 62 is located at the center of the whole when the light forming the above-mentioned light distribution portion 55 passes through the portion 33 of the cover lens 4;
Moreover, it is slightly spread out to the left and right, forming a vertically extending area in the center.

Reference numeral 63 designates a region where the light forming the light distribution portions 56 and 57 passes through the portions 35 and 36 of the cover lens 4 and is slightly expanded in the left-right direction, thereby forming an area extending in the left-right direction.

The portion where this light distribution portion 63 and the light distribution portion 62 overlap constitutes a high luminous intensity band in the light distribution pattern 59.

Reference numeral 64 denotes a light distribution portion formed by the light forming the light distribution portion 58 passing through the portions 37 and 38 of the cover lens 4 and being slightly spread left and right, forming a hot zone in the light distribution pattern 59. .

In this way, a sufficient amount of light can be secured even if the beam is narrow with a small vertical width, and
Even if the cover lens 4 is tilted, the light distribution pattern 59 can be hardly affected by the tilt.

(h. Another example of the diffuse reflection part) [Figs. 15 to 17] Figs. 15 to 17 show another example of the diffuse reflection part in the vehicle headlamp of the present invention.

Here, the diffuse reflection section 65 of the upper reflection surface 13 consists of two left and right sections 66 and 67, and the image sections 66 and 67 form a co-paraboloid.

The focal points of these two parts 66 and 67 are located at the same point as the focal point FI3 of the upper reflective surface 13, and the optical axis y, 1l-xlL of the left part 66 when viewed from the plane is directed slightly to the left, that is, forward It is tilted so that it is displaced to the left as it goes to
Further, the optical axis xr-xr of the right side portion 67 is inclined slightly to the right, that is, so as to be displaced to the right as it goes forward. Note that the inclination of this optical axis may be reversed left and right.

Also, the light above! I[thx fl −x fl and xr
-xr is inclined slightly downward toward the front with respect to the irradiation axis XX when viewed in the vertical direction. Note that this may be parallel to the irradiation axis X-x.

According to such a diffuse reflection section 65, for example, when the sub-filament 10 is lit, each portion 66.
The light distribution parts 68 and 69 caused by the reflected light at 67 are positioned so as to spread further outward from the positions touching the left and right lower edges of the light distribution part 40, as shown in FIG. It can be irradiated.

(G. Effects of the Invention) As is clear from the above description, the vehicle headlamp of the present invention has a light emitting reflection surface that deflects light from a light source and focuses the light on a focusing position in front, and a front end. A projector type comprising a light-shielding plate arranged horizontally so that the light-shielding edge of the light is located near the light condensing position, and a projection lens located in front of the light-shielding plate and having its focal point located on the light-shielding edge. A vehicle headlamp having an optical system above the irradiation axis, in which a portion of the light projecting and reflecting surface located below the light shielding plate when viewed from the front is used to horizontally diffuse the light reflected by that portion. In the vertical direction, it is characterized by a diffuse reflection part that emits light parallel to the irradiation axis or slightly downward.

Therefore, in the vehicle headlamp of the present invention, the light reflected by the diffuse reflection part of the light projecting reflection surface is irradiated parallel to the irradiation axis or downwardly, so it is eclipsed by the light shielding plate and is lost. Therefore, the luminous flux can be used effectively.

In addition, in the above embodiments, specific examples of reflective surfaces that can be used as such reflective surfaces with respect to the light condensing reflective portion of the light projecting reflective surface are illustrated by indicating the numbers of the preceding applications, but this is merely an example. However, this does not mean that the light condensing and reflecting section in the present invention is limited to the exemplified examples.

Further, the shape of the light shielding plate is not limited to that shown in the examples, and the structures and shapes shown in the examples are merely examples, and the technical scope of the present invention is limited by these. It is not intended to be interpreted as such.

[Brief explanation of the drawing]

's1 figure ~'! Fig. s17 shows an example of implementation of the vehicle headlamp of the present invention, Fig. 1 is a perspective view schematically showing the whole, Fig. 2 is a front view showing the state with the cover lens removed,
3 is a sectional view taken along line III--III in FIG. 2, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a partially cutaway plan view, and FIG. is a front view, FIGS. 7 to 9 show the light emitting and reflecting surface and related elements, FIG. 7 is a schematic perspective view, FIG. 8 is a longitudinal cross-sectional view, and FIG. Cross-sectional view along line IX-IX, Figures 10 and 1
Figure 1 shows the lower reflective surface and its associated elements;
The figure is a schematic perspective view, FIG. 11 is a longitudinal sectional view, FIG. 12 is a schematic perspective view showing the left inner reflective surface and elements related thereto, and FIG. 13 is a light distribution pattern of a passing beam.
(A) shows the light distribution pattern before passing through the cover lens, (B)
) shows the light distribution pattern after passing through the cover lens, FIG. 14 shows the light distribution pattern of the traveling beam, and (A) shows the light distribution pattern before passing through the cover lens.
(B) shows the light distribution pattern after passing through the cover lens, and FIGS. 15 to 17 show modified examples of the diffuse reflection section, and FIG. 15 is a schematic perspective view, and FIG.
6 is a longitudinal sectional view, FIG. 17 is a sectional view taken along the line M-IQ in FIG. 16, and FIGS. 18 to 20 are examples of conventional vehicle headlamps. FIG. 19 is a schematic perspective view of the main part, FIG. 19 is a longitudinal sectional view of the main part, and FIG. 20 is a front view of the main part. Explanation of symbols 1...Vehicle headlight, 6...Projection lens, 13...Light projection reflection surface, 19...Diffuse reflection section, 21...Light condensing position, 28...Light shielding Edge, 65...
Diffuse reflection part, 66... Paraboloidal reflection part, 67... Paraboloidal reflection part, 5... Light shielding plate, 10... Light source, X-X... Irradiation axis, F6... Focus of the projection lens, xu-xJ2... optical axis of the parabolic reflection section 66, xr-x
r... Optical axis of parabolic reflector 67 fake application person

Claims (3)

[Claims] (1) A light projection reflecting surface that reflects the light from the light source and focuses it on a light focusing position in front, and a light shielding plate that is arranged horizontally so that the light blocking edge at the front end is located near the light focusing position. A vehicle headlamp having a projector-type optical system above the irradiation axis, comprising a projection lens located in front of the light-shielding plate and whose focal point is located on the light-shielding edge, wherein The part of the light shielding plate located below the light shielding plate when viewed from the front is characterized by being a diffuse reflection part that diffuses the reflected light from that part in the horizontal direction and irradiates the light parallel to the irradiation axis or slightly downward in the vertical direction. vehicle headlights (2) A vehicle headlamp according to claim 1, wherein the diffuse reflection portion is a surface that forms a parabola in a vertical section and an ellipse in a horizontal section. (3) The diffuse reflection part consists of two left and right parabolic reflection parts,
The vehicle according to claim 1, wherein the optical axes of the two parabolic reflectors are parallel to the irradiation axis or are slightly inclined in front of the irradiation axis, and are inclined with respect to the irradiation axis when viewed from above. headlight