JPH02216701A - Headlamp for vehicle - Google Patents

Abstract

PURPOSE:To secure the amount of illumination light even if the vertical width of illumination is made small by forming the low beam with a light interrupting body disposed in the path of light irradiated from an auxiliary filament, and by forming the high beam with a light distribution pattern with the light of a main filament reflected with a plurality of reflecting surfaces. CONSTITUTION:For the low beam, light rays from an auxiliary filament 10 are concentrated with an upper reflecting surface 13, and a light interrupting body 5 having a light interrupting edge is disposed near the position where light rays are concentrated to form a light distribution pattern. For the high beam, light rays from a main filament are concentrated with upper and lower reflecting surfaces 13, 14 to form a vertically extending portion, and a light distribution pattern is formed with light rays concentrated with right and left inner reflecting surfaces 15, 16 and with parallel light rays from outer rotary parabolic reflecting surfaces 17, 18. Thus, the amount of illumination light is secured even if the vertical width of illumination is made small by utilizing the merits of headlamps of projector type and a type using the rotary parabolic reflectors.

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 B0 Summary of the invention C1 Prior art and its problems a. Background art I. Prior art and its problems b-16 Paraboloid of revolution reflector b-2. Projector-type headlight [Figure 14] Means E for solving problem 08, Example [Figures 1 to 13] a. Overview: Light bulb C8 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 shield e, projection lens f, cover lens g, light distribution pattern g-1, light distribution pattern of passing beams g-t-a, light distribution pattern without cover lens g-1-port, light distribution pattern through cover lens g-2, light distribution pattern of traveling beam g-2-a, distribution without cover lens Light pattern g-2-mouth, light distribution pattern F1 transmitted through cover lens Effects of the invention (A. Field of industrial application) The present invention relates to a novel vehicle headlamp. Specifically, the present invention aims to provide a new vehicle headlamp that can accommodate narrower vertical widths and tilted cover lenses, and that can ensure a sufficient amount of light and a desired light distribution pattern. It is something.

(B. Summary of the Invention) The vehicle headlamp of the present invention includes a main filament that extends substantially along the irradiation axis and a reflector located in front of the main filament, and when the reflector is viewed from the front, it can be viewed up, down, left and right. It is composed of a plurality of reflective surfaces divided approximately radially, and for passing beams, an upper reflective surface is formed on the surface that reflects and focuses the light from the sub-filament at a focusing position above the front irradiation axis. The light and dark cut lines of the passing beams and the approximate light distribution pattern are formed by a light shielding body having a light shielding edge near the light condensing position, and a projection lens located further in front of the light shielding body having a focal point on the light shielding edge, and the filament A high luminous intensity band is formed at the center of the light distribution pattern by the portions located near the center of the left and right reflective surfaces, which are surfaces that once condense the light from the left and right sides and then diffuse it, and the focal point is located near the filament. The highest luminous intensity part at the center of the light distribution pattern is formed by the outer parts of the left and right reflecting surfaces, which are paraboloids of revolution. The lower reflective surface has a light distribution pattern, which focuses the light on a first focusing position extending in the horizontal direction in front of the camera, and condensing the light at a second focusing position further in front of the first focusing position and extending in the vertical direction. The center part forms a part that spreads vertically, and the part located near the center of the left and right reflective surfaces forms a part that slightly spreads horizontally at the center of the light distribution pattern, and is located closer to the outside of the left and right reflective surfaces. The highest luminous intensity part at the center of the light distribution pattern is formed by the part where the light is distributed, and the upper reflective surface forms a part that widely spreads in the left and right direction of the light distribution pattern. Since the amount of light emitted from other reflective surfaces does not depend on the size of the front opening, a sufficient amount of irradiation light can be secured even if the vertical width becomes narrower. Since there is little dependence on the lens elements provided on the cover lens, the light distribution pattern will not be distorted even if the cover lens is tilted significantly.

(C. Prior art and its problems) (a. Background art) In recent years, automobile bodies have become streamlined, and there has been an increasing desire to reduce the area of the front of the vehicle.

This is to improve aerodynamic properties in pursuit of fuel savings and driving stability when driving at high speeds. In this way, the space available for the headlights, which are the face of a car, has become narrower, and the height of the headlight installation has also become lower. At the same time, the angle of inclination of the headlight cover lens has also increased. It has become necessary to make it bigger and bigger.

(b. Prior art and its problems) (b-1. Paraboloid of revolution reflector) Paraboloid of revolution reflector has traditionally been widely used as a reflector for vehicle headlights. When a light source is placed at the focal point of a parabolic reflector, the reflected light is parallel to the rotation axis of the reflector. The light distribution of such a parallel light beam is controlled by the front outer lens (cover lens) to create a desired light distribution pattern. The advantage of an optical system using such a rotating paraboloid reflector is that it is easy to design and modify the light distribution pattern, and by using a twin filament light bulb, two types of light distribution patterns, sub and main, can be created in one lamp. It is possible to create.

However, optical systems using a paraboloid of revolution reflector have the following drawbacks.

First, there is a limit to narrowing the width. That is, since the amount of luminous flux depends on the size of the reflecting mirror, if the vertical width of the headlight is narrowed, the amount of luminous flux decreases and the brightness decreases.

Therefore, it is technically difficult to reduce the vertical width of a conventional vehicle headlamp using a paraboloid of revolution reflector while maintaining the required light distribution performance.

Next, there is a limit to the inclination angle of the outer lens.

Vehicle headlights generally use a cylindrical lens that extends downward on the road as the outer lens, and basically obtain a desired light distribution pattern by diffusing the light in the left and right direction. curvature of the surface, inclination with respect to the vertical axis,
The above-mentioned parallel light flux is controlled by using a combination of a large number of various changes in thickness, etc. in the vertical and horizontal directions.

Therefore, there is a problem in that when the outer lens, which is composed of a cylindrical lens group, is tilted, the diffused light that spreads from side to side becomes curved. In particular, this phenomenon has a large effect on the lens step that produces a wide magnification in the left and right directions, so
It becomes impossible to illuminate the far shoulder of the road with sufficient brightness, and light distribution performance deteriorates. In a headlamp having an outer lens with an inclination angle of 40 degrees or more, it is difficult to maintain good light distribution performance due to the above phenomenon.

(b-2, Projector-type headlight) [Figure 14] Projector-type headlights have attracted attention due to the limitations of vehicle headlights that use such rotating paraboloid reflectors. It's coming.

Projector-type headlights refer to the projection systems commonly seen today (e.g. 81IllI111
6□Using the same optical system as a film projector),
This headlamp a, whose schematic diagram is shown in Fig. 14, has a light source placed at the first focal point Fl of an elliptical reflector, and the condensing state (collection of light) near the second focal point F2 is detected using a condensing lens. A certain projection lens C
Project it forward. At this time, a light shielding plate d is placed at the focal point of the projection lens to form a cutoff line for the passing beams.

The advantages of this headlamp are as follows.

That is, (a) the cutoff ratio at the cutoff line;
In other words, a light distribution pattern with a high contrast ratio can be obtained (b)
Advantages include: externally, the size of the headlight is determined by the diameter of the projection lens, so it is small; (c) there is no need for a lens step to create diffused light, and the actor lens can be tilted. has.

However, although such a projector type headlamp a is suitable for a vehicle headlamp with a narrow width and an inclined outer lens, there are still some problems.

First, projector-type headlights are similar to conventional two-lamp vehicle headlights that use a rotating paraboloid reflector, with a 2ffi-type light distribution pattern of a passing beam and a running beam from a single lamp. Therefore, in addition to the projector-type headlights dedicated to the passing beam, a headlight dedicated to the running beam is required, and a four-lamp headlight must be used.

Secondly, since the light distribution pattern is determined by the light condensation state at the light shielding plate position, most of the light distribution pattern design must be done using an elliptical reflector, which makes it especially difficult to freely design the light intensity distribution in the hot zone. .

Also, the diameter is 50. Although it is a small 60□ headlight, the round projection lens has an unusually conspicuous design.

(D. Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and is a conventional type headlight using a projector-type headlight and a rotating paraboloid reflector. The present invention aims to provide a new vehicle headlamp that takes advantage of the advantages of each type of headlamp and compensates for its shortcomings.

That is, it includes a main filament extending substantially along the irradiation axis and a reflecting mirror located in front of the main filament, and is composed of a plurality of reflecting surfaces that are substantially radially divided vertically and horizontally when the reflecting mirror is viewed from the front, Regarding the passing beam, there is a light shielding body that has an upper reflecting surface formed on a surface that reflects and focuses the light from the sub-filament at a focusing position above the forward irradiation axis, and a light blocking edge near the focusing position. and a projection lens located further forward and having a focal point on the light-shielding edge, form the light and dark cut lines of the passing beams and approximately its light distribution pattern, and once condense the light from the filament in the left and right directions, then diffuse it. A high luminous intensity band is formed at the center of the light distribution pattern by the part located near the center of the left and right reflecting surfaces, which are surfaces, and the focus is located near the filament near the outside of the left and right reflecting surfaces, which are paraboloids of revolution. The highest luminous intensity part at the center of the light distribution pattern is formed depending on the position of the light distribution pattern, and for the traveling beam, the light from the main filament is reflected and focused at a first focusing position extending in the horizontal direction in front of the main filament. The lower reflective surface that emits light and focuses the light at a second light focusing position that extends in the vertical direction further in front of the first light focusing position forms a part that expands in the vertical direction at the center of the light distribution pattern, and The part located closer to the center of the reflective surface forms a part that slightly spreads to the left and right at the center of the light distribution pattern, and the part located closer to the outside of the left and right reflective surfaces forms the highest luminous intensity part at the center of the light distribution pattern. , the upper reflective surface forms a portion that widely spreads in the left and right direction of the light distribution pattern, and as a result, the amount of light emitted from the reflective surface other than the portions located on the outside of the left and right reflective surfaces is reduced. Since it does not depend on the size of the front opening, a sufficient amount of light can be secured even if the vertical width becomes thinner, and there is less dependence on the lens elements provided on the cover lens for forming the light distribution pattern. Therefore, even if the cover lens is tilted significantly, the light distribution pattern will not be distorted.

(E. Embodiment) [FIGS. 1 to 13] Details of the vehicle headlamp of the present invention will be described below according to the illustrated embodiment.

(A, Overview) 1 is a vehicle headlight, which includes a reflector 2, a light bulb 3, and a reflector 2.
a cover lens 4 that covers the front of the frame, and a light shield 5 that creates a cutoff line in the light distribution pattern of the passing beam.
and a projection lens 6 for projecting forward a collection of light that is partially cut off by the light shielding body 5.

(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 the filament 10 being arranged in front of the filament 9.

The light shielding cap 11 shields the passing beam filament 10 from substantially the lower half of the reflecting surface of the reflecting mirror 2, which will be described later.

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, reflecting mirror) The reflecting mirror 2 has a concave reflecting surface facing forward,
The reflective surface is divided into multiple parts. In addition, reflecting mirror 2
The axis that passes through the center of the beam and extends straight in the direction that the reflecting mirror 2 faces, that is, forward, is called the irradiation axis and is indicated by X--X.

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 reflective surface) The upper reflective surface 13 has its focal point r+s on the irradiation axis x-
Focusing position 1 on x and above the irradiation axis x-x
It is said to be a surface with a number 9. That is, the light emitted from the light source disposed at the focal point Fts and reflected by the reflective surface 13 is condensed at the condensing position 19.

In this embodiment, the light condensing position 19 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.

Incidentally, examples of the reflective surface that can be used as the upper reflective surface 13 include the reflective surface shown in Japanese Patent Application No. 86437/1983.

(c-2, lower reflective surface) The lower reflective surface 14 has a focal point FI4 that is the focal point F of the upper reflective surface 13.
It is located behind I3 (on the top side of the reflecting mirror 2), the first light collection position intersects the irradiation axis XX and becomes a straight line 20 extending horizontally, and the second light collection position is the first light collection position 20. The reflection surface forms a straight line 21 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 20.
The light is then focused at the second focusing position 21.

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 20.21.

(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 1
"ts, Flll is located between the focal point F13 of the upper reflective surface 13 and the focal point Fla of the lower reflective surface 14.

For such a reflecting surface 15.16, the first light condensing position is a straight line 22.23 extending vertically, and the second
The light convergence position can be obtained by setting each parameter of the equation of the reflecting surface as a horizontally extending straight line 24.25, for example, as desired in the equation of the reflecting surface shown in the above-mentioned Japanese Patent Application No. 86437/1983. . In this case, the reflective surface 15.1
By determining the size of the light beam 6 and the position of the first condensing position 22, 23, the angle of diffusion of the light in the horizontal direction can be freely selected. For example, the closer the first condensing position 22.23 is to the reflecting mirror 2, the larger the diffusion angle in the horizontal direction, and the farther the second converging position 24.25 is from the reflecting mirror 2, the larger the angle of diffusion in the vertical direction. It becomes close to parallel light flux. 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 applied.

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 leading axis is substantially the same as the irradiation axis XX, and its focal point is located at substantially the same position as the focal point FI4 of the lower reflective surface 14.

(c-5, position of 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 1
0 is located at the focal point Fl of the upper reflective surface 13.

(d. Light-shielding body) The light-shielding body 5 has a substantially plate shape, and its front edge 26 serves as a light-shielding edge.

The light shielding body 5 is arranged substantially horizontally above the irradiation axis XX, and its light shielding edge 26 is located at the light converging position 19 of the upper reflective surface 13.
It is located near the , and is designed to cut out a part of the light gathering at that position. The light-shielding edge 26 is curved to match the curvature of field of the projection lens 6,
The projected image by the projection lens 6 is clearly expressed from the center to both ends of the light-shielding edge 26, and a clear cutoff line is projected.

Note that the shape of the light-shielding edge 26 when viewed from the front is adapted to a desired cutoff line in the light distribution pattern of the passing beam.

The upper surface 27 of the light shielding body 5 is made into a reflective surface by vapor deposition means or the like. As a result, the light that has entered the upper surface 27 of the light shield 5 is reflected by the upper surface 27 and enters the upper half of the projection lens 6, and the light that has not been cut by the light shield 5 is transmitted to the lower half of the projection lens 6. Since the light incident on the entire projection lens 6 is projected, 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.

Further, the lower surface 28 of the light shielding body 5 is also made into a reflective surface by vapor deposition means or the like. As a result, the light incident on the lower surface 2.8 of the light shielding body 5 is also reflected by the lower surface 28 and emitted forward, so that the light beam is utilized without wasting it.

Reference numeral 29 denotes a shielding portion vertically disposed from the center of the front edge of the light shielding body 5, and the shielding portion 29 prevents light from entering the projection lens 6 from below the light shielding body 5.

The rear edge 30 of the light shielding body 5 is located slightly 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 part continuous with the upper plane part 2a), so that the light does not pass through. It is shaped to prevent direct radiation toward the upper flat portion 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 placed in front of the light shielding body 5. It is arranged so that the focal point F6 is located at the center of the light shielding edge 26.

(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.

The entire cover lens 4 is divided into six parts.

The portion 31 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 31 has almost no lens elements formed therein, and may be referred to as a so-called transparent portion. It is a part.

The portion 32 is provided corresponding to the lower reflective surface 14 and is a portion into which the light reflected by the reflective surface 14 enters, and is a prism step 3 for concentrating the light at the center of the light distribution pattern.
3.33,... are formed. It also has a slight diffusion function to the left and right.

The portion 34 corresponds to the left inner reflective surface 15, and the portion 3
Reference numeral 5 denotes a portion corresponding to the right inner reflecting surface 16, into 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 36 corresponds to the left outer reflective surface 17, and the portion 3
Reference numeral 7 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) (g-1-
B. Light distribution pattern without cover lens) FIG. 12(A) shows the light distribution pattern 38 when the sub-filament 10 is turned on and the light does not pass through the cover lens 4.

In the light distribution pattern 38, 39 indicates a collection of light reflected by the upper reflective surface 13 at the light shielding edge 26 position and a light shielding edge 26.
The shape is the light distribution portion projected by the projection lens 6, and this forms the approximate outline of the light distribution pattern of the passing beam. The upper edge 4 of the light distribution portion 39
0 is the cut-off line on which the light-shielding edge 26 of the light-shielding body 5 is projected.

41 is a light distribution portion due to the light reflected by the left inner reflective surface 15, and 42 is a light distribution portion due to the light reflected by the right inner reflective surface 16. The shape of these light distribution portions 41 and 42 is shaped like a waxing monthly installment because the light directed toward the lower half of the reflective surface 15.16 out of the light emitted from the sub-filament 10 is blocked by the light-shielding cap 11. This is because The upper edge 42a of the light distribution portion 42 is inclined 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.

Reference numeral 43 indicates a light distribution portion due to the light reflected by the left outer reflective surface 17, and 44 indicates a light distribution portion due to the light reflected from the right outer reflective surface 18. Light does not reach approximately the lower half of these reflective surfaces 1 and 18, and since the right shoulder of the light shielding cap 11 is located slightly lower than the left shoulder, the upper part of the light distribution portion 44
44 a is slanted upward to the left.

As can be seen from the above, the light distribution portion 39 forms the entire outline of the light distribution pattern, the light distribution portions 41 and 42 are located at the center of the light distribution pattern to form a high luminous intensity band, and the light distribution portion 43 and 44 are directed toward the center of the light distribution pattern to form the highest luminous intensity zone, the so-called hot zone.

In this way, a light distribution pattern 38 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 38 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 45 shown in FIG. 12(B) is a light distribution pattern obtained when the light distribution pattern 38 is transmitted through the cover lens 4.

Reference numeral 46 indicates that the light that becomes the light distribution portion 39 described above is connected to the cover lens 4.
This is the light distribution portion obtained by passing through the zero portion 31, and forms the entire outline of the light distribution pattern 45.

Reference numeral 47 denotes a light distribution portion formed by the light forming the above-mentioned light distribution portions 41 and 42 passing through the portions 34 and 35 of the cover lens 4 and being slightly diffused in the left and right direction. It forms a high luminosity zone.

Reference numeral 48 denotes a light distribution portion formed by the light distribution portions 43 and 44 being slightly expanded inward by passing through the portions 36 and 37 of the cover lens 4, and forming a hot zone of the light distribution pattern 45.

In this way, a sufficient amount of light can be secured even if the vertical width is small and narrow, and even if the cover lens 4 is tilted, the light distribution pattern 45 is hardly affected by it. Can be done.

(g-2, light distribution pattern of traveling beam) (g-2-i,
(Light distribution pattern without cover lens) Figure 13 (A) shows the light distribution pattern when the main filament 9 is turned on.
Moreover, it shows the light distribution pattern 49 in a state where the light does not pass through the cover lens 4.

50 is a light distribution portion formed by the light reflected by the upper reflective surface 13, and forms a portion extending from side to side below the light distribution pattern 49.

51 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 at the center.

52 is a light distribution portion due to the light reflected by the left inner reflective surface 15, and 53 is a light distribution portion due to the light reflected by the right inner reflective surface 16. These light distribution portions 52 and 53 have a horizontally long pattern with their respective inner ends located at the center.

Reference numeral 54 denotes a light distribution portion based on 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 49 described above is transmitted through the cover lens 4, it becomes a pattern 55 shown in FIG. 13(B).

Reference numeral 56 indicates that the light that becomes the light distribution portion 50 described above is directed to the cover lens 4.
Since the portion 31 of the cover lens 4 has almost no lens function, it has substantially the same pattern as the light distribution portion 50 described above.

57 is bent slightly downward so that the center of the pattern 57 is located at the center of the whole when the light forming the light distribution section 51 passes through the section 32 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 58 designates a region in which the light forming the light distribution portions 52 and 53 is slightly expanded in the left-right direction by passing through the portions 34 and 35 of the cover lens 4, thereby forming an area extending in the left-right direction.

The portion where this light distribution portion 58 and the light distribution portion 57 overlap constitutes a high luminous intensity band in the light distribution pattern 55.

Reference numeral 59 denotes a light distribution portion formed by the light forming the light distribution portion 54 passing through the portions 36 and 37 of the cover lens 4 and being slightly spread left and right, forming a hot zone in the light distribution pattern 55. .

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 55 can be hardly affected by the tilt.

(F. Effect of the invention) As is clear from the above description, the vehicle headlamp of the present invention has a main filament extending substantially along the irradiation axis, a sub-filament located in front of the main filament, and a reflecting mirror. The reflecting mirror has a plurality of reflecting surfaces divided substantially radially in the upper, lower, left and right directions when viewed from the front, and the upper reflecting surface directs the light from the sub-filament to a condensing position above the irradiation axis in front of the upper reflecting surface. A light-shielding body having a light-shielding edge is disposed near the light-converging position, and a projection lens having a focal point on the light-shielding edge is provided further in front of the light-shielding body, and the lower reflective surface is the main surface. A surface that focuses the light from the filament on a first focusing position extending in the horizontal direction in front of the filament, and condensing the light at a second focusing position extending in the vertical direction further forward from the first focusing position, The part located closer to the center of the left and right reflective surfaces is a surface that once focuses the light from the two filaments in the left and right direction and then diffuses it, and the part located closer to the outside of the left and right reflective surfaces is a surface that focuses the light from the two filaments in the left and right directions. It is characterized by a paraboloid of revolution located near two filaments.

Therefore, regarding the passing beam, there is an upper reflecting surface formed on the surface that reflects and focuses the light from the sub-filament at a focusing position above the front irradiation axis, and a light shielding edge near the focusing position. The light-dark cut line of the passing beam and the approximate light distribution pattern are formed by the light-shielding body and the projection lens located further in front of it and having its focus on the light-shielding edge, and once the light from the filament is focused in the left and right direction, The parts located near the center of the left and right reflective surfaces, which are diffusing surfaces, form a high luminous intensity band in the center of the light distribution pattern, and the focal point is the outside of the left and right reflective surfaces, which are paraboloids of revolution located near the filament. The parts located closer to each other form the highest luminous intensity part at the center of the light distribution pattern, and for the traveling beam, the light from the main filament is reflected and the first light condensing position extends in the front horizontal direction. Focus the light on the first
The lower reflective surface that condenses light at the second condensing position that extends in the vertical direction further forward from the condensing position forms a part that expands in the vertical direction at the center of the light distribution pattern, and The part located closer to the center of the light distribution pattern forms a part that spreads slightly to the left and right, and the part located closer to the outside of the left and right reflective surfaces forms the highest luminous intensity part at the center of the light distribution pattern, and the upper reflective surface forms a portion that widely spreads in the left-right direction of the light distribution pattern, and as a result, the amount of light emitted from the reflective surfaces other than the portions located on the outside of the left and right reflective surfaces is equal to the size of the front opening. Since there is no dependence on the lens element provided on the cover lens, it is possible to secure a sufficient amount of irradiation light even if the vertical width becomes narrower. Also, since there is less dependence on the lens elements provided on the cover lens for forming the light distribution pattern, it is possible to Even when tilted, the light distribution pattern does not collapse.

In the above embodiments, specific examples of reflective surfaces that can be used as the upper reflective surface, lower reflective surface, and left and right inner reflective surfaces are illustrated by indicating the numbers of the preceding applications. This is merely an example, and does not mean that the reflective surface in the present invention is limited to the example.

Further, the shape of the light shielding body 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]

1 to 13 show an example of the implementation of the vehicle headlamp of the present invention, FIG. 1 is a perspective view schematically showing the whole, and FIG. 2 is a front view showing the state with the cover lens removed. 3 is a sectional view taken along the line III--III in FIG. 2, FIG. 4 is a sectional view taken along the IV-rV line in FIG. 2, and FIG. 5 is a partially cutaway plan view. Figure 6 is a front view, Figures 7 and 8 show the upper reflective surface and related elements;
The figure is a schematic perspective view, Figure 8 is a longitudinal sectional view, Figures 9 and 10.
The figures show the lower reflective surface and its related elements, FIG. 9 is a schematic perspective view, FIG. 10 is a vertical sectional view, FIG. 11 is a schematic perspective view showing the left inner reflective surface and its related elements, and FIG. 12
The figure shows the light distribution pattern of the 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, and FIG. 13 shows the light distribution pattern of the traveling beam.
(A) shows the light distribution pattern before passing through the cover lens, and CB
) shows the light distribution pattern after passing through the cover lens, and FIG. 14 is a conceptual diagram showing an example of a projector-type headlamp. Explanation of symbols 1... Vehicle headlight, 2... Reflector, 5... Light shield, 6... Projection lens, F6... Focus of projection lens, 9... Main filament, 10 ・ ・ ・Lower reflective surface, 6... Located inside the left and right reflective surfaces 8... Light condensing position of the upper reflective surface located outside the left and right reflective surfaces, First light condensing position of the lower reflective surface , second light focusing position of the lower reflective surface, light-shielding edge applicant Koito Seisakusho Co., Ltd.? , Ku (Musohachi)

Claims (1)

[Claims] A main filament extending substantially along the irradiation axis, a sub-filament located in front of the main filament, and a reflecting mirror, the reflecting mirror being divided substantially radially into upper, lower, left and right directions when viewed from the front. It has a plurality of reflective surfaces, the upper reflective surface is a surface that reflects and focuses the light from the sub-filament at a light focusing position above the irradiation axis in front of it, and has a light shielding edge near the light focusing position. A light shield is disposed, and a projection lens having a focal point on the light shielding edge is provided further in front of the light shield, and the lower reflective surface focuses the light from the main filament onto a first focusing position extending in the horizontal direction in front of the projection lens. , is a surface that condenses light at a second condensing position that extends in the vertical direction further forward from the first condensing position, and the portion located near the center of the left and right reflective surfaces directs the light from the two filaments to the left and right. For vehicles, the surface is a surface that once condenses light in the direction and then diffuses it, and the portions located on the outside of the left and right reflective surfaces are paraboloids of rotation with focal points located near the two filaments. headlights