JPH0365601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The vehicle headlamp of the present invention will be explained in accordance with the following items.

A Industrial field of application B Summary of the invention C Prior art [Figure 20] D Problems to be solved by the invention [Figure 20] E Means for solving the problems F Example F-1 Reflector [ Figs. 1 to 5] a General formula of the reflecting mirror [Fig. 1] b Paraboloid-ellipsoidal reflecting surface [Fig. 2] c First deformed paraboloid-ellipsoidal reflecting surface [Fig. 3 ] d Second deformed paraboloid-ellipsoidal reflective surface [Figure 4] e Elliptical reflective surface [Figure 5] F-2 First embodiment [Figures 6 to 10] a Reflector b Light shielding Plate c Condenser lens unit d Cover lens e Light distribution F-3 Second embodiment [Figures 11 to 15] a Reflector b Light shielding plate c Condenser lens unit d Cover lens e Light distribution e-1 Cover Light distribution e-2 when there is no lens Light distribution F-4 when there is a cover lens Third embodiment [Figures 16 to 19] a Reflector b Light shielding plate c Condensing lens unit d Light distribution G 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 novel vehicular headlamp that has a narrow width, has a high luminous flux utilization rate, and can form an arbitrary light distribution pattern.

(B. Summary of the Invention) The vehicle headlamp of the present invention includes a plurality of light-shielding portions located approximately at the focal point of each condenser lens of a condenser lens unit consisting of a plurality of condenser lenses whose respective optical axes extend approximately in parallel. By arranging a pattern-forming light-shielding plate consisting of Even if it is a lamp, it has a high luminous flux utilization rate, and by appropriately selecting the shape of the light shielding plate and the focal position of each condensing lens, it is possible to form any light distribution pattern. be.

(C Prior Art) [Figure 20] A condensing lens unit b having a plurality of optical axes a1 _{and a2} , and a substantially focal position c of the condensing lens unit b.
There is one in which a light shielding plate d for pattern formation is arranged, a light source (not shown) is provided, and a reflecting mirror e is provided to condense light in the vicinity of the focal point c.

(D Problems to be solved by the invention) [Chapter 20
Figure ] Conventional vehicle headlights like the ones mentioned above have the advantage of being easy to obtain a desired light distribution pattern, but
When the width is narrowed, there is a problem in that the utilized luminous flux is wasted.

That is, as shown in FIG. 20, in the above vehicle headlamp, the reflected light by the reflector e is focused near the focal point c of the condensing lens, and then the light is reflected from the condensing point. The light is irradiated with a conical spread.

Therefore, if the light emitting surface of the vehicle headlamp, that is, the condensing lens unit b, has a narrow width as shown in the figure, the luminous flux in the upper and lower parts f and f shown with diagonal lines in the figure The problem is that the luminous flux is not irradiated in the forward direction, and the luminous flux utilization rate is extremely poor.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the vehicle headlamp of the present invention uses a reflector that condenses reflected light into a substantially linear shape, and each optical axis A condenser lens unit consisting of a plurality of condenser lenses extending substantially parallel to each other and having a focal point near the line on which the reflected light is condensed is provided, and a condenser lens unit consisting of a plurality of light shielding parts respectively arranged near the focal point position. A light shielding plate for pattern formation is arranged.

First, the vehicle headlamp of the present invention uses a reflector that once condenses the reflected light into a linear shape, so even if the vehicle headlamp has a long and narrow light-emitting surface, the light-emitting surface is If the longitudinal direction of the light is arranged along the direction of the line on which the reflected light is focused, there will be no waste in the use of the reflected light.

Further, the condenser lens unit has a plurality of condenser lenses whose optical axes extend substantially parallel to each other, and a pattern forming unit consisting of a plurality of light-shielding portions each arranged near the focal point of each condenser lens. By arranging the light shielding plate, it is easy to form a pattern in which the desired light distribution pattern is subdivided into several elements, and the desired light distribution pattern can be obtained by combining these elements. Therefore, it is extremely easy to obtain a desired light distribution pattern.

(F. Embodiment) Details of the vehicle headlamp of the present invention will be described below with reference to illustrated embodiments.

(F-1 Reflector) [Figures 1 to 5] In the present invention, a reflector that condenses reflected light into a line is used. First, the basic principle of the reflector will be explained.

(a. General formula of reflecting mirror) [Figure 1] FIG. 1 is a diagram showing an outline of a reflecting mirror 1. As shown in FIG.

This reflecting mirror 1 is made of a quadratic curved surface, and each element thereof is shown using x, y, and z coordinates. The x, y, and z axes intersect each other at one point at right angles, and the apex of the reflecting surface of the reflecting mirror 1 is located at the intersection 0. The x-axis extends in the optical axis direction of the reflecting mirror 1, the y-axis extends in the vertical direction, and the z-axis extends in the horizontal direction. The point where the x-axis intersects the line where the light emitted from the point light source placed at the first focal point _F1 located close to the vertex 0 of the reflective surface and reflected by the reflective surface is focused in the horizontal direction.
If F ₂ is a second focal point and the point F ₃ where the line on which the reflected light is vertically focused intersects with the X-axis is a third focal point, the reflecting surface is expressed by the following general formula.

F(x, y, z) = [(x-f) ² +y ² +z
² ] ^1/2 + {(x−k ₁・f) ² +y ² +[1−(k ₂ −k ₁ )/k ₂・f−x・f]
² z ² } ^1/2 − (k ₁ +1)・f=0...Formula (1) In addition, in the above general formula (1) for the reflecting surface, f is from the vertex 0 of the reflecting surface to the first focus F ₁ The distance k ₁ ·f is the distance from the vertex 0 to the second focal point F ₂ , and the distance k ₂ ·f is the distance from the vertex 0 to the third focal point F ₃ .

By appropriately changing the values of k ₁ and k ₂ in the reflective surface, a reflective surface having desired reflective characteristics can be obtained.

(b Paraboloid - Ellipsoidal reflective surface) [Figure 2] In the above general formula (1), if |k ₂ |→∝, then F(x, y, z) = [(xf) ² +y ² +z ² ] ^1/2 + [(x-
k ₁ ·f) ² +y ² ] ^1/2 − (k ₁ +1) · f=0, and the reflecting surface becomes a paraboloid-ellipsoid reflecting surface.

That is, the reflecting surface of the reflecting mirror 1 has a horizontal cross section, that is, z
A cross-section along the axis is a parabola, and a vertical cross-section, that is, a cross-section along the y-axis, is an ellipse, resulting in a composite surface of the two. Therefore, in the vertical direction, the light reflected by the reflecting surface is condensed into a line extending in the horizontal direction at the second focal point _F2 (see Figure 2B), and in the horizontal direction, it is a parallel beam of light parallel to the x-axis. (See Figure 2C).

(c 1st deformed paraboloid - ellipsoidal reflecting surface) [3rd
[Figure] Next, in the above general formula (1), if k ₂ > k ₁ , the reflected light will be directed horizontally and x at the second focal point F ₂
A deformed paraboloid that focuses light on a line perpendicular to the axis (see Figure 3B), and further focuses light on a line perpendicular to the x-axis at the third focal point _F3 (see Figure 3C). A surface-ellipsoidal reflective surface is formed.

(d Second deformed paraboloid - ellipsoidal reflecting surface) [4th
Furthermore, if k ₂ <k ₁ in the above general formula (1), in the vertical direction the light is focused at the second focal point F ₂ (see Fig. 4B), and in the horizontal direction the light is focused at the second focal point F 2 from the vertex 0. A deformed parabolic-ellipsoidal reflecting surface is obtained that diffuses so that the third focal point _F3 is on the _side of the first focal point F1 (see FIG. 4C).

Note that when k ₂ =k ₁ in the above general formula (1), the reflecting surface becomes an ellipsoid, which is the same as the reflecting mirror e in the conventional vehicle headlamp, and therefore cannot be used.

(e Elliptical reflective surface) [Fig. 5] In addition to the reflective surface represented by the above general formula, substantially the same luminous flux can be obtained by using a modified elliptical reflective surface.

The axis along the long axis is the x-axis, the axis along the short axis in the horizontal direction is the y-axis, and the axis along the short axis in the vertical direction is the z-axis.
1/2 of the long axis is a, 1/2 of the short axis in the y-axis direction
Let b be 1/2 of the short axis in the z-axis direction be c, and form a reflective surface made of an ellipsoid of revolution that satisfies the formula x ² /a ² +y ² /b ² +z ² /c ² = 1. , 0<c<b<a, and if we place the light source at the position of x=-√ ² - ² , the light source will be reflected on a plane parallel to the y-z plane at the position of x=-√ ² - ² . The image of (when the shape of the light source is spherical) has the shape shown with diagonal lines in FIG. 5B, and the "k ₂
＞k ₁ '' can be obtained.

(F-2 First Embodiment) "Figs. 6 to 10" Figs. 6 to 10 show the first embodiment 2 of the vehicle headlamp of the present invention.

(a Reflecting Mirror) 3 is a reflecting mirror, and its reflecting surface 4 is formed into a parabolic-ellipsoidal reflecting surface in the case of "k ₂ →∝" in the above general formula.

5 is a light source, and the first focus F ₁ of the reflecting mirror 3 is
It is located in The light source 5 may be a high-pressure metal vapor discharge lamp such as a metal halide lamp,
Incandescent lamps such as halogen lamps can be used.

Therefore, the light emitted from the light source 5 and reflected by the reflective surface 4 forms a line (hereinafter referred to as a "focal line") extending in the horizontal direction that intersects perpendicularly to the optical axis x at the second focal point _F2 of the reflective surface 4. The light will be focused on 6.

(b Light-shielding plate) 7 is a light-shielding plate. The light shielding plate 7 consists of four light shielding parts 7a, 7b, 7c, and 7d arranged in the horizontal direction, and each of these light shielding parts 7a, 7b, 7
The upper edges 8a, 8b, 8c, and 8d of the lenses c and 7d are arranged close to the focal line 6. For more information,
It is located slightly in front of the focal line 6.

The upper edges 8b and 8c of the light-shielding portions 7b and 7c have right half inclined edges 8b' and 8c' downward to the right when looking at the light-shielding plate 7 from the reflecting mirror 3 side. These inclined edges 8b' and 8c' are formed. These sloped edges 8
Although the inclination angles of b' and 8c' cannot be absolutely defined, for example, they are inclined at about 15 degrees with respect to the focal line 6.

Of the light emitted from the light source 5, reflected by the reflection line 3, condensed by the focal line 6, and then spread in the vertical direction, most of the light directed downward is reflected by the light shielding plate 3.
The forward ejection will be blocked by this.

(c Condensing lens unit) 9 is a condensing lens unit disposed in front of the light shielding plate 7 and corresponding to the front surface of the reflecting mirror 3;
Three condenser lenses 9a, 9b, 9c, and 9d are integrally formed. And each condenser lens 9a-9
d denotes each light shielding portion 7a to 7 of the light shielding plate 7, respectively.
It corresponds to d. That is, the condenser lens 9a has a light-shielding portion 7a, and the condenser lens 9b has a light-shielding portion 7b.
, the condenser lens 9c has a light shielding portion 7c, and
The condenser lenses 9d correspond to the light shielding portions 7d, respectively.

The condensing lens 9a has a cylindrical shape extending in the horizontal direction, and its focal line 1 extends in the horizontal direction.
0a is located slightly in front of the upper edge 8a of the light shielding portion 7a. Therefore, the image of the light-shielding portion 7a projected forward by the condensing lens 9a becomes a real image upside down.

The condensing lens 9b has the shape of a spherical lens,
The focal point 10b is located slightly in front of the approximate center of the upper edge 8b of the light shielding portion 7b. Therefore, the image of the light shielding portion 7b projected forward by the condensing lens 9b becomes a real image with the top and bottom and left and right sides reversed.

Note that the shape of the condensing lens 9b does not have to be a spherical lens shape, as long as it has a tendency to focus the light transmitted through it vertically and horizontally.

The condensing lens 9c also has the shape of a spherical lens,
The focal point 10c is located slightly in front of the center of the upper edge 8c of the light shielding portion 7c. Therefore, the image of the light shielding portion 7c projected forward by the condenser lens 9c becomes a real image with the top and bottom and left and right sides reversed. Since the focal length of the condensing lens 9c is smaller than the focal length of the condensing lens 9b, the light-shielding portion 7c projected thereby
The image is larger than the image of the light-shielding portion 7b projected by the condenser lens 9b. That is, if the image is projected onto a screen that is the same distance apart, the condenser lens 9
The one due to c is larger. In other words, the degree of diffusion of light by the condenser lens 9c is the same as that of the condenser lens 9b.
It will be larger than if

Note that the shape of the condensing lens 9c is not limited to a spherical lens shape, but may be any shape as long as the light transmitted therethrough tends to be converged vertically and horizontally.

The condensing lens 9d has a cylindrical shape extending in the horizontal direction, and its focal line 1 extends in the horizontal direction.
0d is located slightly in front of the upper edge 8d of the light shielding portion 7d. Therefore, the image of the light-shielding portion 7d projected forward by the condensing lens 9d becomes a real image that is upside down. And this condensing lens 9
The focal length of d is made considerably shorter than the focal length of said condenser lens 9a, and correspondingly the light shielding portion 7
d is also located in front of the light shielding portions 7a, 7b, and 7c. Since the focal length of the condenser lens 9d is shorter than the focal length of the condenser lens 9a, the projected image of the light-shielding portion 7d is vertically larger than the projected image of the light-shielding portion 7a.
The image of the light projected forward without being blocked by d is also larger in the vertical direction than that by the condenser lens 9a.

(d Cover Lens) 11 is a cover lens arranged on the front side of the condensing lens unit 9.

The cover lens 11 has diffusion steps 12, 12, . . . formed in a portion 11d corresponding to the condenser lens 9d of the condenser lens unit 9, and
The parts other than 1d are transparent. Therefore,
From the portion 11d, there is a light shielding portion 7d and a condensing lens 9d.
Controlled light is emitted in a state where it is spread left and right.

(e Light Distribution) Next, the light distribution by the headlight 2 will be explained. First, the light distribution will be explained by dividing it into each element with reference to FIG.

FIG. 9A shows a light distribution element 13a formed by the light blocking portion 7a, the condensing lens 9a, and the transparent portion of the cover lens 11. In FIG. 9, V-V is a vertical line and H-H is a horizontal line, and the point where these two intersect is the optical axis x-x of the reflecting mirror 3.
It is located above. Further, a shaded portion 14a in FIG. 9A is a light cut portion blocked by the light blocking portion 7a.

The upper edge of this light distribution element 13a is horizontal line H-H.
It is a spot-like, high-luminous area that is located slightly below the vertical line V-V and spreads slightly to the left and right around the vertical line V-V.

FIG. 9B shows a light distribution element 13b formed by the light-shielding portion 7b, the condensing lens 9b, and the transparent portion of the cover lens 11. In this diagram 1
4b is a light cut portion blocked by the light blocking portion 7b.

This light distribution element 13b has an upper edge along the vertical line V-
On the right side of V, it is located slightly below the horizontal line H-H, and on the left side of the vertical line V-V, it forms an inclined edge 13b' sloping upward to the left. Therefore, the vertical line V
On the left side of a position slightly to the left of -V, light is also irradiated above the horizontal line H-H.

Incidentally, the inclined edge 13b' corresponds to the inclined edge 8b' of the light shielding portion 7b.

This light distribution element 13b includes a condenser lens 9
Since it has a spherical lens shape and also has a diffusion function in the left-right direction, it has a spread in the left-right direction.

FIG. 9C shows a light distribution element 13c formed by the light shielding part 7c, the condensing lens 9c, and the transparent part of the cover lens 11. In this diagram 1
4c is a light cut portion blocked by a light blocking portion 7c.

This light distribution element 13c has an upper edge along the vertical line V-
On the right side of V, it is located slightly below the horizontal line H-H, and on the left side of the vertical line V-V, it forms an inclined edge 13c' sloping upward to the left. Therefore, the vertical line V
On the left side of a position slightly to the left of -V, light is also irradiated above the horizontal line H-H.

Incidentally, the inclined edge 13b' corresponds to the inclined edge 8b' of the light shielding portion 7b.

This light distribution element 13c also has a condensing lens 9.
Since c is in the shape of a spherical lens and also has a diffusion function in the left and right direction, it has an expanse in the left and right direction. Since the focal length of the condenser lens 9c is shorter than the focal length of the condenser lens 9b, the resulting diffusion angle is larger than that caused by the condenser lens 9b, so that the light distribution element 13c spreads in the left-right direction. and the downward spread (the upper part is limited by the light shielding part 7c) is the light distribution element 1
It is larger than those of 3c.

FIG. 9D shows a light distribution element 13d formed by a light shielding portion 7d, a condensing lens 9d, and a portion 11d of the cover lens 11.

14d is a light cut portion blocked by the light blocking portion 7d.

A diffusion step is provided on the portion 11d of the cover lens 11.
Assuming that there are no 12, 12, ..., the light distribution will be such that the upper edge is located slightly below the horizontal line H-H and the vertical line V-V is the center, as shown by the two-dot chain line 13d'. Although the light is distributed in a spot-like manner extending downward, it is diffused in the left-right direction by the diffusion steps 12, 12, . The light distribution greatly expands in the left and right directions centering on the vertical line V-V.

Therefore, each light distribution element 13a, 13 as described above
b, 13c, and 13d are superimposed to form a light distribution pattern 15 as shown in FIG.

This light distribution pattern 15 is suitable as a light distribution pattern for a passing beam in a headlamp for an automobile. In addition, when forming the light distribution pattern of the passing beam when vehicles drive on the right side, the light shielding portion 7
The inclined edges 8b', 8c' formed on the right side of b, 7c may be formed on the left side, and the sloped edges 8b', 8c' may be formed on the left side.

(F-3 Second embodiment) [Figures 11 to 15
FIG. 11 to FIG. 15 show a second embodiment 16 of the vehicle headlamp of the present invention.

(a Reflecting Mirror) Reference numeral 17 denotes a reflecting mirror, and its reflecting surface 18 is formed into a deformed paraboloid-ellipsoid reflecting surface in the case of "k ₂ > k ₁ " in the above general formula.

19 is a light source, and the first focal point of the reflecting mirror 17 is
Located in _F1 .

Thus, the light emitted from the light source 19 and reflected by the reflecting surface 18 is focused horizontally at the second focal point _F2 on a line 20 (focal line) orthogonal to the optical axis x-x, Further, the light is focused at the third focal point in the vertical direction and on a line perpendicular to the optical axis xx.

(b Light-shielding plate) 21 is a light-shielding plate. The light shielding plate 21 has three light shielding parts 21a, 21b, 21c arranged in the horizontal direction.
and these light shielding parts 21a, 21
The upper edges 22a, 22b, 22c of b, 21c are located close to the focal line 20. Specifically, it is located slightly in front of the focal line 20.

The upper edge 22b of the light-shielding portion 21b has a right half sloped edge 22b' downward to the right when looking at the light-shielding plate 21 from the reflecting mirror 17 side.

Thus, the reflected light emitted from the light source 19 and reflected by the reflecting mirror 17 is condensed at a focal line 20, and then spreads in the vertical direction and condensed on a vertical focal line at a third focal point. Of the reflected light, most of the light that travels downward after passing through the focal line 20 is blocked by the light shielding plate 21 from being emitted forward.

(c Condensing lens unit) 23 is a condensing lens unit arranged in front of the light shielding plate 21 and corresponding to the front surface of the reflecting mirror 17, and includes three condensing lenses 23a, 23a and 23a arranged in the horizontal direction.
23b and 23c are integrally formed. Each condenser lens 23a, 23b, 23c is connected to each light shielding portion 21a, 21 of the light shielding plate 21, respectively.
b, 21c. That is, the condensing lens 23a corresponds to the light-shielding portion 21a, the condensing lens 22b corresponds to the light-shielding portion 21b, and the condensing lens 23c corresponds to the light-shielding portion 21c.

The condensing lens 23a has a cylindrical shape extending in the horizontal direction, and a focal line 24a thereof extending in the horizontal direction is located slightly in front of the upper edge 22a of the light shielding portion 21a.

The condensing lens 23b has the shape of a spherical lens, and its focal point 24b is located at the upper edge 24 of the light-shielding portion 21b.
It is located slightly in front of the approximate center of b. still,
The shape of the condensing lens 23b does not have to be a spherical lens shape, as long as it has a tendency to focus the light transmitted through it vertically and horizontally.

The condensing lens 23c has a cylindrical shape extending in the horizontal direction, and a focal line 24c thereof extending in the horizontal direction is located slightly in front of the upper edge 22c of the light shielding portion 21c.

(d Cover Lens) 25 is a cover lens arranged on the front side of the condensing lens unit 23.

The cover lens 25 is a condensing lens unit 23
Diffusion steps 26,
26, . . . are formed, and a portion 25b corresponding to the condenser lens 23b is a transparent portion.

(e Light distribution) (e-1 Light distribution when there is no cover lens) The light distribution when the cover lens 25 in the above-mentioned headlamp 16 is not provided is as shown in FIG.

That is, 27a is the light shielding part 21a and the condensing lens 2.
27b is a light distribution element controlled by the light shielding portion 21b and the condensing lens 23b, and 27c is the light distribution element controlled by the light shielding portion 21.
c and a condensing lens 23c. In this figure, the shaded portions 28a, 28b, and 28c are the light shielding portions 2, respectively.
This is a light cut portion blocked by 1a, 21b, and 21c.

Further, the inclined edge 27b' of the light distribution element 27b corresponds to the inclined edge 22b' of the light shielding portion 21b.

(e-2 Light distribution when there is a cover lens) When the light creating the above-mentioned light distribution shown in FIG. 14 is transmitted through the cover lens 25, the light distribution shown in FIG. 15 is obtained. That is, the light distribution element 27a is expanded laterally by the diffusion steps 26, 26, . . . to become the light distribution element 29a, and the light distribution element 27c
is spread laterally by the diffusion steps 26, 26, . . . to form a light distribution element 29c.

(F-4 Third embodiment) [Figures 16 to 19
FIG. 16 to FIG. 19 show a third embodiment 30 of the vehicle headlamp of the present invention.

(a Reflecting Mirror) Reference numeral 31 denotes a reflecting mirror, and its reflecting surface 32 is formed into a deformed parabolic-ellipsoidal reflecting surface in the case of "k ₂ <k ₁ " in the above general formula.

33 is a light source, and the first focal point of the reflecting mirror 31 is
Located in _F1 .

Therefore, the reflected light emitted from the light source 33 and reflected by the reflective surface 32 is condensed at a line (focal line) 34 that intersects the optical axis at the second focal point _F2 and extends in the horizontal direction, and from there, The light is diffused in the horizontal direction so that the third focal point is located on the opposite side of the first focal point _F1 . Therefore, the reflected light spreads in the horizontal direction as it moves away from the aperture surface of the reflecting mirror 31.

(b Light-shielding plate) 35 is a light-shielding plate. The light shielding plate 35 has five parts arranged in the horizontal direction, 35a, 35b, 35c,
35d and 35e, and each upper edge 36a, 36b, 3 of these light shielding portions 35a to 35e.
6c, 36d and 36e are located close to the focal line 34. Specifically, it is located slightly in front of the focal line 34.

The upper edge 36c of the central light-shielding portion 35c
When looking at the light shielding plate 35 from the reflecting mirror 31 side, the right half is a sloped edge 35c' that slopes downward to the right.

Therefore, among the reflected light emitted from the light source 33 and reflected by the reflecting mirror 31, most of the light directed downward after condensing at the focal line 34 is blocked from being emitted forward by the light shielding plate 35.

(c Condensing lens unit) 37 is a condensing lens unit disposed in front of the light shielding plate 35 and corresponding to the front surface of the reflecting mirror 31;
Five parts 37a, 37b, 3 arranged in the horizontal direction
7c, 37d and 37e are integrally formed. Each of the condensing lenses 37a to 37e corresponds to each portion 35a to 35e of the light shielding plate 35, respectively. That is, the condenser lens 37a has a light shielding portion 35a, and the condenser lens 37b has a light shielding portion 35b.
, the condenser lens 37c has a light shielding portion 35c, the condenser lens 37d has a light shielding portion 35d, and the condenser lens 3
7e corresponds to the light shielding portion 35e.

As described above, since the reflected light is emitted with a tendency to diffuse in the horizontal direction, the horizontal size of the light shielding plate 35 is made larger than the horizontal size of the opening of the reflecting mirror 31. Further, the size of the condenser lens unit 37 in the horizontal direction is larger than the size of the light shielding plate 35.

The condensing lenses 37a and 37e have a horizontally extending cylindrical shape, and their horizontally extending focal lines 38a and 38e are located slightly in front of the upper edges 36a and 36e of the light shielding portions 35a and 35e.

Further, the condenser lenses 37b, 37c, and 37d are each in the shape of a spherical lens, and the focal point 3
8b, 38c and 38d are the respective light shielding portions 35b, 3
Upper edges 36b, 36c and 36d of 5c and 35d
It is located approximately in the center and slightly in front of the center. Note that the shape of these condensing lenses 37b, 37c, and 37d does not have to be spherical lenses, as long as they tend to focus the light transmitted through them vertically and horizontally.

(d. Light distribution) Therefore, the light distribution by the above-described headlamp 30 is as shown in FIG. 19.

In this figure, 39a is a light distribution element controlled by a light shielding portion 35a and a condenser lens 37a, and 29b is a light distribution element controlled by a light shielding portion 35b and a condenser lens 37b.
A light distribution element 39c is controlled by a light shielding portion 35c and a condenser lens 37c, and a light distribution element 39d is controlled by a light shielding portion 35d and a condenser lens 37d. 39e is a light distribution element consisting of a light shielding part 35e and a condensing lens 37.
This is a light distribution element controlled by e.
Incidentally, the inclined edge 39c' of the light distribution element 39c is the light shielding part 3.
This corresponds to the inclined edge 36c' of 5c.

Note that a cover lens may be further provided in front of the condenser lens unit 37.

(G. Effects of the Invention) As is clear from the above description, the vehicle headlamp of the present invention comprises a condenser lens unit consisting of a plurality of condenser lenses whose respective optical axes extend approximately in parallel; A pattern-forming light-shielding plate consisting of a plurality of light-shielding portions arranged approximately at the focal positions of each of the condensing lenses of the lens unit; It is characterized by comprising a reflecting mirror that produces condensed reflected light, and a light source disposed within the reflecting mirror.

Therefore, since the vehicle headlamp of the present invention uses a reflector that once condenses the reflected light into a linear shape, even if the vehicle headlamp has a long and narrow light emitting surface, If the longitudinal direction of the light emitting surface is arranged along the direction of the line on which the reflected light is condensed, there will be no waste in the use of the reflected light.

Further, the condenser lens unit has a plurality of condenser lenses whose optical axes extend substantially parallel to each other, and a pattern forming unit consisting of a plurality of light-shielding portions each arranged near the focal point of each condenser lens. By arranging the light shielding plate, it is easy to form a pattern in which the desired light distribution pattern is subdivided into several elements, and the desired light distribution pattern can be obtained by combining these elements. It is extremely easy to obtain a desired light distribution pattern.

[Brief explanation of drawings]

Fig. 1 is a perspective view for explaining the general formula of the reflecting surface of the reflecting mirror used in the present invention, Fig. 2 shows an example of the reflecting mirror used in the present invention, and Fig. A is a perspective view, and Fig. B is a perspective view. 3 is a horizontal sectional view, C is a vertical sectional view, and FIG. 3 shows another example of the reflector used in the present invention, A is a perspective view, B is a horizontal sectional view, and C is a vertical sectional view. Figures 4 and 4 show still another example of the reflecting mirror used in the present invention. Examples of yet another reflector that can be used are shown in Fig. A is a perspective view, Fig. B is a light distribution diagram, and Figs. 6 to 10 show a first embodiment of the vehicle headlamp of the present invention. 6 is a schematic perspective view, FIG. 7 is a horizontal sectional view, FIG. 8 is a vertical sectional view, FIG. 9 is a diagram showing individual light distribution elements from A to D, and FIG. The figure shows a light distribution pattern, and FIGS. 11 to 15 show a second embodiment of the vehicle headlamp of the present invention, in which FIG. 11 is a perspective view, and FIG. 12 is a horizontal sectional view.
Fig. 13 is a vertical sectional view, Fig. 14 is a diagram of the light distribution pattern before being controlled by the cover lens, Fig. 15 is a diagram of the light distribution pattern in the state controlled by the cover lens,
6 to 19 show a third embodiment of the vehicle headlamp of the present invention, FIG. 16 is a perspective view, and FIG. 17 is a perspective view.
The figure is a horizontal sectional view, Figure 18 is a vertical sectional view, and Figure 19 is a vertical sectional view.
The figure is a light distribution pattern diagram, and FIG. 20 is a schematic perspective view showing an example of a conventional vehicle headlamp. Explanation of symbols, 2...Vehicle headlight, 3...Reflector, 5...Light source, 7...Shade plate, 7a to 7d...
Light-shielding portion, 9...Condensing lens unit, 9a-9
d... Condenser lens, 10a to 10d... Focal point (line), 16... Vehicle headlight, 17... Reflector,
19... Light source, 21... Light shielding plate, 21a to 21c
... Light shielding part, 23 ... Condensing lens unit, 2
3a to 23c... Condensing lens, 24a to 24c...
...Focus (line), 30...Vehicle headlight, 31...
Reflector, 33... Light source, 35... Light shielding plate, 35a
~35e...Light shielding portion, 37...Condensing lens unit, 37a-37e...Condensing lens, 38a~
38e...Focus (line).

Claims (1)

[Scope of Claims] 1. A condenser lens unit consisting of a plurality of condenser lenses whose respective optical axes extend substantially parallel; a pattern-forming light-shielding plate comprising a light-shielding portion; a reflecting mirror that generates reflected light that is condensed in a substantially linear shape substantially along a line connecting the focal positions of each of the condensing lenses; A vehicle headlamp characterized by being equipped with a light source.