JP2517385B2 - Vehicle headlights - Google Patents

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 use B. Outline of the invention C. Prior art D. Problems to be solved by the invention [Figs. 18 to 20] E. Means for solving the problems F. Embodiments [first Figures to 17] a. Overview b. Light bulb c. Reflecting mirror c-1. Upper reflecting surface c-2. Lower reflecting surface c-3. Left and right inner reflecting surface c-4. Left and right outer reflecting surface c-5 Position of filament d. Light-shielding plate e. Projection lens f. Cover lens g. Light distribution pattern g-1. Light distribution pattern of passing beam g-1-a. Light distribution pattern without cover lens g-1-b. Light distribution pattern through cover lens g-2. Light distribution pattern of traveling beam g-2-a. Light distribution pattern without cover lens g-2-b. Light distribution pattern through cover lens h. Another example of diffuse reflection part [Figs. 15 to 17] G. Effect of the invention (A. Industrial field of application) The present invention is a novel vehicle headlamp. Regarding Specifically, in a vehicle headlamp having a projector-type optical system on the upper side of the irradiation axis, the light reflected by the light projecting / reflecting surface of the optical system, which is blocked by the lower surface of the light-shielding plate, causes loss. It is intended to provide a new vehicle headlight that can effectively utilize light without the use of the headlight.

(B. Overview of the Invention) The vehicle headlamp of the present invention is a so-called projector-type optical system, that is, a light projecting / reflecting surface that reflects light from a light source and focuses it at a light collecting position in the front and a light shield at the front end. An irradiation system including an optical system including a light-shielding plate horizontally arranged so that an edge thereof is located in the vicinity of the light-collecting position and a projection lens located in front of the light-shielding plate and having its focus on the light-shielding edge. A headlamp for a vehicle having an upper part of the above, wherein a portion of the above-mentioned light projecting / reflecting surface, which is located below the light shielding plate when viewed from the front, diffuses the reflected light by that portion in the horizontal direction and in the vertical direction, the irradiation axis. As a diffusive reflection part that irradiates the light in parallel or downwards, the light reflected by the light projecting / reflecting surface that has been obstructed by the light shielding plate can be used as an effective light beam without being obstructed by the light shielding plate.

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

In accordance with the design of the vehicle body to improve the high-speed performance of the vehicle, the vehicle headlight also has a small vertical width to be narrow,
In addition, the cover lens may have to be largely tilted according to the shape of the vehicle body.

However, a conventional parabolic reflector, which has been generally used, produces a parallel light flux, and the parallel light flux is controlled by a longitudinally extending cylindrical prism step formed on a cover lens to obtain a desired light distribution. A vehicle headlamp designed to obtain a pattern cannot cope with narrowing of width or inclination of a cover lens.

That is, in a paraboloidal reflector, the number of emitted light beams depends on the size of the light projecting / reflecting surface. Will come. When light is diffused by a cylindrical prism step, when the prism step is inclined, both ends of the diffusion pattern are upward (when inclined forward) or downward (inclined downward). In the case), there is a problem that the light distribution pattern is broken due to bending.

Therefore, a projector-type vehicle headlight has been proposed. In this type of vehicle headlight, a converging point or a condensing point or condensing point of reflected light is provided. Since the light distribution pattern is formed by the light blocking body having the light blocking edge positioned at the portion and the projection lens that projects the light at the light blocking edge position to the front, the light distribution pattern is hardly required to be shaped by the cover lens, and the cover lens Even if it is tilted, it has almost no effect on the light distribution pattern, and since the light condensed at the condensing point or condensing part is projected by the projection lens, the front surface that is the emission surface thereof is Even if the vertical width is reduced, the number of emitted light beams is not affected, and a sufficient number of emitted light beams can be secured.

Therefore, an attempt has been made to combine a projector type optical system having such advantages on the upper side to obtain a light distribution pattern close to an ideal one.

(D. Problems to be Solved by the Invention) [Figs. 18 to 20]
[FIG.] By the way, in a projector type optical system combined on the upper side of the irradiation axis, there is a problem that light loss occurs in the projector type optical system.

In FIGS. 18 and 19, XX is the irradiation axis of the headlight, a is a light projecting / reflecting surface, b is a light source located on the irradiation axis XX, and c is a condensing position. Light emitting surface a
The light reflected by is focused on the focusing position c. Reference numeral d is a plate-shaped light-shielding plate, and its front edge e is a light-shielding edge.
The light-shielding edge d of the light-shielding plate d is the light-collecting position c.
Is located in the vicinity of and is arranged substantially horizontally above the irradiation axis XX.

Reference numeral f denotes a projection lens arranged in front of the light shielding plate d and with its optical axis xx substantially parallel to the irradiation axis XX, and its focus _Ff is substantially the center of the light shielding edge e. Is located in.

In such a projector type optical system, the light h reflected by the part g of the light projecting / reflecting surface a below the light shielding plate d when viewed from the front is shielded by the light shielding plate d and emitted to the front. It becomes lost light that is not done.

(E. Means for Solving the Problem) In order to solve the above-mentioned problems, the vehicle headlamp of the present invention is a light projecting / reflecting surface that reflects light from a light source and focuses the light at a front light collecting position. And an optical system comprising a light-shielding plate horizontally arranged such that the light-shielding edge at the front end is located in the vicinity of the light-collecting position, and a projection lens located in front of the light-shielding plate and having a focal point located on the light-shielding edge. A headlamp for a vehicle having an upper side of an irradiation axis, wherein a portion of the light projecting and reflecting surface located below the light shielding plate when viewed from the front diffuses light reflected by the portion in a horizontal direction. In the case, the diffuse reflection part is used to irradiate in parallel or slightly downward with the irradiation axis.

Therefore, in the vehicular headlamp of the present invention, the light reflected by the diffuse reflection portion of the light-projecting anti-slope is radiated parallel to the irradiation axis or in the front downward direction, so that the light is eclipsed by the light shielding plate and is lost. It is possible to effectively utilize the luminous flux.

(F. Embodiment) [FIGS. 1 to 17] The details of the vehicle headlamp of the present invention will be described below with reference to the illustrated embodiment.

(A. Overview) 1 is a vehicle headlight, including a reflector 2, a light bulb 3, a cover lens 4 covering the front of the reflector 2, and a light shield plate 5 for making a cut-off line in the light distribution pattern of the low beam. A projection lens 6 is provided for projecting a collection of light, a part of which is cut by the light shielding plate 5, to the front.

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

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

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

The light-shielding paint 12 applied to the front end of the glass bulb 7 of the light bulb 3 shields the filaments 9 and 10 from the front.

(C. Reflecting Mirror) The reflecting mirror 2 has a reflecting surface that is recessed toward the front, and the reflecting surface is divided into a plurality of parts. The direction in which the reflecting mirror 2 directly faces the center of the reflecting mirror 2, that is, the axis that extends straight forward is referred to as the irradiation axis and is indicated by XX.

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

The reflecting surface is radially divided into four parts on the left and right ends except for a quarter of each, and the upper and lower reflecting surfaces 13, the lower reflecting surface 14, and the left inner reflecting surface each have a substantially fan shape. 15 and the right inner reflecting surface 16. 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.

The left outer reflection surface 17 and the right outer reflection surface 18 have approximately one-quarter areas at the left and right ends.

(C-1. Upper Reflecting Surface) The upper reflecting surface 13 is a light projecting reflecting surface in the present invention, and is composed of a diffuse reflecting portion 19 in the lower portion and a condensing reflecting portion 20 other than that.

This light projecting / reflecting surface 13 has its focal point F ₁₃ approximately at the irradiation axis X-
Have on X.

The condensing reflector 20 is a surface having a condensing position 21 above the irradiation axis XX. That is, the light emitted from the light source arranged at the focal point F ₁₃ and reflected by the reflection surface 20 is condensed at the condensing position 21.

Further, in this embodiment, the light condensing position 21 is a line that extends in a substantially horizontal direction and is curved so that both ends are located forward from the center when viewed from above. It is preferable that the curved projection lens 6 is adapted to the field curvature.

Examples of the reflecting surface that can be used as the condensing / reflecting portion 20 include the reflecting surface shown in Japanese Patent Application No. 63-86437.

The diffuse reflection part 19 has an ellipse in a horizontal cross section and a parabola in a vertical cross section. The first focus of the ellipse and the focus of the parabola are common, and the same as the focus F ₁₃ of the light projecting / reflecting surface 13. It is located at the point of. Further, 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 downward.

Therefore, the light emitted from the light source arranged at the focal point F ₁₃ and reflected by the diffuse reflection part 19 is emitted in parallel with the irradiation axis X-X or slightly downward, and in the horizontal direction, the second elliptical shape.
Irradiation is performed so that the light is focused once and then diffused.

(C-2. Lower reflecting surface) The lower reflecting surface 14 has a focal point F ₁₄ located behind the focal point F ₁₃ of the upper reflecting surface 13 (on the top side of the reflecting mirror 2), and the first focusing position irradiates. A straight line 22 that intersects the axis XX and extends horizontally,
Of the irradiation axis X-X before the first focusing position 22
The reflecting surface is a straight line 23 that intersects with and extends vertically.

Therefore, the light emitted from the light source arranged at the focal point F ₁₄ and reflected by the reflecting surface 14 is first condensed at the first condensing position 22 and then condensed at the second condensing position 23. It is like this.

It should be noted that the above-mentioned Japanese Patent Application No. 63-8643 is also used for the reflecting surface 14 as described above.
The reflective surface shown in the 7 patent application may be applied. in this case,
Each parameter of the equation of the reflecting surface may be determined so that the first and second 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 for reflecting light emitted from the light sources arranged at the focal points F ₁₅ and F ₁₆ , once converging in the left and right directions, and then diffusing the light. have been and, its focal point F _15, F ₁₆ is positioned intermediate the focus F ₁₄ of the focal point F ₁₃ and the lower reflection surface 14 of the upper reflecting surface 13.

As such reflecting surfaces 15 and 16, the first condensing position is the straight lines 24 and 25 extending vertically, and the second condensing position in front of it is the straight lines 26 and 27 extending horizontally, for example, ,
It can be obtained by setting each parameter of the equation of the reflecting surface shown in the above-mentioned Japanese Patent Application No. 63-86437 to a desired one. In this case, the diffusion angle of the light in the left-right direction can be freely selected by determining the size of the reflecting surfaces 15 and 16 and the positions of the first converging positions 24 and 25. For example, the first
The closer the condensing positions 24 and 25 are to the reflecting mirror 2, the larger the divergence angle in the left-right direction becomes, and the farther the second converging positions 26 and 27 are from the reflecting mirror 2, the closer to the parallel light beam in the vertical direction. .
Further, in order to obtain a light flux parallel in the vertical direction, for example, the reflecting surfaces (7) and (8) shown in the first embodiment of Japanese Patent Application No. 63-199514 may be applied.

Further, as the reflecting surfaces 15 and 16 of this portion, Japanese Patent Application No. 63-
It is also possible to apply the reflective surface shown in the 82759 patent application.

(C-4. Left and right outer reflecting surfaces) Both the left and right outer reflecting surfaces 17 and 18 are rotational paraboloids, the optical axis of which is substantially the same as the irradiation axis XX, and the focal point is the lower reflecting surface 14.
It is almost at the same position as the focal point F ₁₄ of.

(C-5. Position of filament) In the light bulb 3, the center of the main filament 9 is located at the focal point F ₁₄ of the lower reflecting surface 14, and the center of the sub filament 10 is located at the focal point F _{13 of the} upper reflecting surface _13. It is arranged to be located in.

(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 shading plate 5 is arranged substantially horizontally at the position of the boundary between the diffuse reflection part 19 and the condensing reflection part 20 of the upper reflection surface 13 when viewed from the front above the irradiation axis XX, and the shading edge 28 thereof is the above reflection. It is located in the vicinity of the condensing position 21 on the surface 13 and cuts off a part of the light gathering at that position. The light-shielding edge 28 is curved so as to match the field curvature of the projection lens 6, and the image projected by the projection lens 6 is clearly expressed from the center of the light-shielding edge 28 to both ends, and a clear cut-off line is formed. It is projected.

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

The upper surface 29 of the light shielding plate 5 is made a reflecting 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 the lower half of the projection lens 6. Since the light incident on the whole of the projection lens 6 is projected in addition to that on the projection lens 6, color bleeding due to the chromatic aberration of the projection lens 6 may appear along the periphery of the light distribution pattern, particularly along the cut-off line. The light flux is prevented and the light flux is effectively used.

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

The rear edge 31 of the shading plate 5 is located a little behind the line connecting the rear end of the main filament 9 and the upper opening edge of the reflecting surface of the reflecting mirror 2 (the connecting portion continuous with the upper flat surface 2a), and the light is upward. Plane part of
It is shaped so as not to be directly exposed to 2a.

(E. Projection lens) The projection lens 6 is a convex lens-shaped condenser lens,
The optical axis xx is arranged so as to extend above the irradiation axis XX and in parallel therewith, and is arranged in front of the light shielding plate 5 such that the focus F ₆ is located at the center of the light shielding edge 28.

(F. Cover Lens) The cover lens 4 is arranged in front of the reflecting mirror 2 so as to cover its front opening with respect to the front. Further, the cover lens 4 is inclined forward and downward.

The cover lens 4 is divided into six parts as a whole.

The portion 32 is provided corresponding to the projection lens 6 and is a portion on which the light projected by the projection lens 6 is incident. In this portion 32, almost no lens element is formed, so to speak, it may be called a plain portion. It is a part.

The portion 33 is provided for the lower reflecting surface 14 and
Is a portion where the light reflected by is incident, prism steps 34, 34 for collecting the light in the center of the light distribution pattern,
... are formed. It also has a slight left-right diffusion function.

The portion 35 corresponds to the left inner reflecting surface 15, and the portion 36 corresponds to the right inner reflecting surface 16.The light reflected by the respective reflecting surfaces 15 and 16 is incident, and the light is greatly distorted. A lens step that does not exist is formed.

The portion 37 corresponds to the left outer reflection surface 17, and the portion 38 corresponds to the right outer reflection surface 18. The light reflected by each of the reflection surfaces 17 and 18 is incident, and the light is distributed by the light. It is designed to make the center of the pattern.

(G. Light distribution pattern) Next, the light distribution pattern of each beam emitted by the vehicle headlamp 1 will be described by dividing it into a light distribution pattern of a passing beam and a light distribution pattern of a traveling beam.

(G-1. Light distribution pattern of passing beam) (g-1-a. Light distribution pattern without cover lens) FIG. 13 (A) shows when the auxiliary filament 10 is turned on.
Moreover, the light distribution pattern 39 in a state where the cover lens 4 is not transmitted is shown.

In the light distribution pattern 39, 40 is a light collecting and reflecting portion of the upper reflecting surface 13.
The light gathering at the position of the light-shielding edge 28 of the light reflected by 20 and the shape of the light-shielding edge 28 are the light distribution portions formed by being projected by the projection lens 6, and by this, the outline of the light distribution pattern of the passing beam is roughly defined. It is formed. The upper edge 41 of the light distribution portion 40 is a cutoff line on which the light shielding edge 28 of the light shielding plate 5 is projected.

Reference numeral 42 denotes a light distribution portion by the light reflected by the diffuse reflection portion 19 of the upper reflection surface 13, and this is a case where the axis of the diffusion reflection portion 19 is slightly lowered to the front. It is located so as to extend to the left and right along the lower edge.

43 is a light distribution part by the light reflected by the left inner reflecting surface 15,
Reference numeral 44 denotes a light distribution portion by the light reflected by the right inner reflecting surface 16. The light distribution portions 43, 44 have an upper chordal moon shape because the light emitted from the sub-filament 10 toward the lower half of the reflecting surfaces 15, 16 is blocked by the light shielding cap 11. Because it is shielded. Further, the reason why the upper edge 44a of the light distribution portion 44 is inclined to the left is that the right shoulder of the light shielding cap 11 of the H4 bulb 3 is slightly lower than the left shoulder.

45 is a light distribution part by the light reflected by the left outer reflection surface 17,
Reference numeral 46 is a light distribution portion by the light reflected by the right outer reflection surface 18. Light does not go to the lower half of these reflecting surfaces 17 and 18, and since the right shoulder of the shading cap 11 is located slightly below the left shoulder, the upper edge 46a of the light distribution portion 46 is left. The shape is inclined upward.

As can be seen from the above, the light distribution portion 40 forms the entire contour of the light distribution pattern, and the light distribution portions 43 and 44 are located in the center of the light distribution pattern to form a high luminous intensity zone, and the light distribution portion. 45 and 46 are directed to the center of the light distribution pattern to form the highest intensity zone, the so-called hot zone. Further, the light distribution portion 42 sufficiently illuminates the front side of the running path, particularly the road shoulder portion.

In this way, a substantially sufficient light distribution pattern 39 is obtained as the light distribution pattern of the low beam without using the cover lens 4, and the light distribution pattern 39 of the low beam is slightly shaped by the cover lens 4 to form the light distribution pattern of the low beam.

(G-1-B. 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.

Reference numeral 48 denotes a light distribution portion obtained by transmitting the above-described light serving as the light distribution portion 40 through the portion 32 of the cover lens 4, and forms the entire contour of the light distribution pattern 47.

Reference numeral 49 is a light distribution portion obtained by transmitting the light forming the light distribution pattern 42 through the portion 33 of the cover lens 4, and extends in the left-right direction along the lower edge of the light distribution portion 48 to the road shoulder portion in front of the runway. It is designed to irradiate.

In 50, the light that becomes the above-mentioned light distribution portions 43 and 44 is the cover lens 4.
It is a light distribution portion that is slightly diffused in the left-right direction by passing through the portions 35 and 36, and forms a high light intensity zone in the central portion of the light distribution pattern 47.

51 is the light distribution portion 45, 46 is the portion 37 of the cover lens 4,
It is a light distribution portion that is slightly expanded inward by transmitting 38, and forms a hot zone of the light distribution pattern 47.

As described above, it is possible to secure a sufficient amount of light even if the vertical width is small and to make the light distribution pattern 47 hardly affected even when the cover lens 4 is tilted. It is possible to irradiate the front side of the runway to the shoulder of the road.

(G-2. Light distribution pattern of traveling beam) (g-2-a. Light distribution pattern without cover lens) FIG. 14 (A) shows when the main filament 9 is turned on,
Moreover, the light distribution pattern 52 is shown in a state where the cover lens 4 is not transmitted.

Reference numeral 53 denotes a light distribution portion formed by the light reflected by the condensing reflection portion 20 of the upper reflection surface 13, and forms a portion that extends left and right below the light distribution pattern 52. Reference numeral 54 is a light distribution portion by the light reflected by the diffuse reflection portion 19.

Reference numeral 55 denotes a light distribution portion formed by the light reflected by the lower reflection surface 14, and has a vertically long pattern in which the lower end portion is located at the center.

56 is a light distribution part by the light reflected by the left inner reflecting surface 15,
Reference numeral 57 denotes a light distribution portion by the light reflected by the right inner reflecting surface 16. Each of the light distribution portions 56 and 57 has a horizontally long pattern in which the inner ends thereof are located in the center.

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

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

Reference numeral 60 denotes a light distribution portion obtained by transmitting the above-described light serving as the light distribution portion 53 through the portion 32 of the cover lens 4, and since the portion 32 of the cover lens 4 has almost no lens action, it is omitted. It has the same pattern as the above-mentioned light distribution portion 53. Reference numeral 61 is a light distribution portion obtained by transmitting the above-described light serving as the light distribution portion 54 through the portion 33 of the cover lens 4.

62 is bent downward so that the central portion of the pattern 62 is located at the central portion of the entire pattern by transmitting the light serving as the aforementioned light distribution portion 55 through the portion 33 of the cover lens 4, and
It is diffused slightly to the left and right, forming a vertically elongated region in the center.

Reference numeral 63 forms a region extending in the left-right direction by spreading the light serving as the light distribution portions 56, 57 through the portions 35, 36 of the cover lens 4 so as to be laterally expanded.

The overlapping portion of the light distribution portion 63 and the light distribution portion 62 forms a high luminous intensity band in the light distribution pattern 59.

Reference numeral 64 denotes the light that becomes the light distribution portion 58 and is the portion of the cover lens
It is a light distribution portion that is transmitted through 37 and 38 and is spread slightly to the left and right, and forms a hot zone in the light distribution pattern 59.

As described above, a sufficient amount of light can be secured even when the traveling beam is narrow and the vertical width is small, and even if the cover lens 4 is tilted, the influence thereof is almost eliminated. You can keep out of 59.

(H. Another Example of Diffuse Reflecting Section) [FIGS. 15 to 17] FIGS. 15 to 17 show another example of the diffuse reflecting section in the vehicle headlight of the present invention.

Here, the diffuse reflection portion 65 of the upper reflection surface 13 has two left and right portions.
It consists of 66 and 67, and both parts 66 and 67 form a paraboloid.

The focal point of these two parts 66 and 67 is the upper reflecting surface.
Located at a point common to the focal point F _{13 of 13} and the left part 6 in plan view
The optical axis xl-xl of 6 is inclined to the left, i.e., so as to be displaced to the left as it goes forward, and the optical axis xr-xr of the right side portion 67 is directed to the right, that is, as it goes forward. It is tilted so that it can be displaced to the right. The inclination of the optical axis may be left-right reversed.

Further, the optical axes xl-xl and xr-xr are inclined in the vertical direction with respect to the irradiation axis XX when viewed in the vertical direction. still,
This may be parallel to the irradiation axis XX.

Then, according to such a diffuse reflection part 65, for example, when the sub-filament 10 is turned on, the respective parts 66, 67 are
The light distribution portions 68 and 69 due to the reflected light at are located so as to further spread outward from the positions in contact with the left and right lower edges of the light distribution portion 40, as shown in FIG. Can be irradiated.

(G. Effects of the Invention) As is apparent from the above description, the vehicle headlamp of the present invention is a projection reflection surface and a front end that reflect light from a light source and focus it at a front focus position. Of a projector type including a light-shielding plate horizontally arranged so that its light-shielding edge is located in the vicinity of the light-collecting position and a projection lens located in front of the light-shielding plate and having its focus on the light-shielding edge. A vehicular headlamp having an optical system on the upper side of an irradiation axis, wherein a portion of the light projecting / reflecting surface located below the light shielding plate when viewed from the front diffuses light reflected by that portion in the horizontal direction. In the vertical direction, it is characterized in that it is a diffuse reflection part that irradiates in parallel with the irradiation axis or in a downward direction.

Therefore, in the vehicular headlamp of the present invention, the light reflected by the diffuse reflection portion of the light projecting / reflecting surface is emitted parallel to the irradiation axis or in the front downward direction, so that the light is eclipsed by the light shielding plate to cause a loss. It is possible to effectively utilize the luminous flux.

In addition, in the above-mentioned embodiment, the condensing reflection part of the light projecting reflection surface is illustrated by exemplifying the number of the preceding application of the specific example of the reflection surface that can be used as the reflection surface, but this is merely an example. However, it does not mean that the condensing / reflecting portion in the present invention is limited to the exemplified ones.

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

[Brief description of drawings]

1 to 17 show an example of an embodiment of a vehicle headlight according to the present invention, and FIG. 1 is a perspective view showing a general outline thereof, and FIG.
The figure is a front view showing a state in which the cover lens is removed, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 4 is IV in FIG.
-A cross-sectional view taken along line IV, FIG. 5 is a plan view showing a part thereof by cutting away, FIG. 6 is a front view, and FIGS. 7 to 9 show a light projecting / reflecting surface and its related elements. FIG. 7 is a schematic perspective view, FIG. 8 is a longitudinal sectional view, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIGS. 10 and 11 are lower reflecting surfaces and elements related thereto. FIG. 10 is a schematic perspective view, FIG. 11 is a longitudinal sectional view, FIG. 12 is a schematic perspective view showing a left inner reflecting surface and its related elements, and FIG. 13 is a light distribution pattern of a low 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, and FIG. 14 shows the light distribution pattern of the traveling beam. Here, (A) shows the light distribution pattern before passing through the cover lens, and (B) shows the light distribution pattern after passing through the cover lens. FIG. 15 to FIG. 17 show a modified example of the diffuse reflection part, FIG. 15 is a schematic perspective view, FIG. 16 is a longitudinal sectional view, and FIG. 17 is taken along line XVII-XVII of FIG. 18 to 20 show an example of a conventional vehicle headlamp, and FIG. 18 is a schematic perspective view of a main part, FIG.
The figure is a vertical cross-sectional view of the main part, and FIG. 20 is a front view of the main part. Explanation of symbols 1 …… Vehicle headlight, 5 …… Shading plate, 6 …… Projection lens, 10 …… Light source, 13 …… Projection reflection surface, 19 …… Diffuse reflection part, 21 …… Condensing position , 28 ...... Shading edge, 65 ...... Diffuse reflection part, 66 ...... Parabolic reflection part, 67 ...... Parabolic reflection part, XX ... Irradiation axis, F ₆ ...... Focus of projection lens, xl -Xl ... Optical axis of parabolic reflector 66, xr-xr ... Optical axis of parabolic reflector 67

Claims (3)

(57) [Claims] 1. A light-shielding plate horizontally arranged such that a light-projecting / reflecting surface for reflecting light from a light source and condensing it at a front light-collecting position and a front light-shielding edge are located in the vicinity of the light-collecting position. A vehicle headlamp having a projector-type optical system, which is located in front of the light-shielding plate and whose focus is located on the light-shielding edge, on the upper side of the irradiation axis. The part of the surface that is located below the shading plate when viewed from the front is a diffuse reflection part that diffuses the light reflected by that part in the horizontal direction and irradiates it in the vertical direction either parallel to the irradiation axis or downward. Vehicle headlights 2. The vehicle headlamp according to claim 1, wherein the diffuse reflection portion is a surface having a parabola in a vertical cross section and an ellipse in a horizontal cross section. 3. The diffuse reflector comprises two parabolic reflectors on the left and right, and the optical axes of the two parabolic reflectors are parallel to the irradiation axis or are slightly downwards and are viewed in a plane with respect to the irradiation axis. The vehicle headlamp according to claim 1, characterized in that it is inclined.