JPH0584601B2 - - 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 application field B. Summary of the invention C. Prior art [Figure 11] D. Problem to be solved by the invention E. Means for solving the problem F. Example F-1 First example [1st example] Figures to Figures 3] a Reflector b Light shield c Projection lens d Effect F-2 Second embodiment [Figures 4 to 6] a Configuration b Effect F-3 Third embodiment [Figure 7 [FIG. 10] a Structure b Effect c Modification [FIG. 10] G Effects of the invention (A Field of industrial application) The present invention relates to a novel vehicle headlamp. Specifically, this vehicle headlamp is designed to obtain a desired light distribution pattern by projecting the light-shielding edge of a light-shielding body located near the condensing area of light reflected by a reflecting mirror forward using a projection lens. The aim is to make it possible for a lamp to emit not only a passing beam but also a traveling beam.

(B Summary of the Invention) The vehicle headlamp of the present invention uses a projection lens to close the light-shielding edge of a light-shielding body located near the convergence area of reflected light emitted from a first light source and reflected by a reflecting mirror. The vehicle headlamp is configured to obtain a desired light distribution pattern by projecting the light to the front, and the second light source is provided close to the surface of the light shielding body facing the projection lens, and the first light source is The second light source alone can be turned on to emit a passing beam, and only the second light source or the first light source and the second light source can be turned on to emit a traveling beam.

(C Prior Art) [Fig. 11] In a vehicle headlamp, for example, the light-shielding edge of a light-shielding body located near the convergence area of the reflected light by the reflector in a vehicle headlamp is projected by a projection lens. There are some devices in which a desired light distribution pattern is obtained by projecting the light forward.

That is, in FIG. 11, a is a reflecting mirror having a condensing area in front, for example, a spheroidal reflecting mirror,
b is a light shield whose upper edge, that is, the light shielding edge c, is placed near the condensing area of the reflecting mirror a; d is a projection lens placed in front of the light shield b; the focal point of the projection lens d is is approximately at the position of the light-shielding edge c.

Such vehicle headlights apply the principle of a projector, and have the advantage of being able to provide a light distribution pattern with extremely sharp outlines.

In particular, since the upper edge of the light distribution pattern, that is, the boundary line between bright and dark, is clearly visible, it is extremely suitable as a headlight for forming a passing beam that must never emit upward light.

(D) Problems to be Solved by the Invention By the way, the above-mentioned conventional vehicle headlights are very convenient for emitting low beams, but cannot emit running beams. There is a problem in that a separate headlamp for irradiation is required.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the vehicle headlamp of the present invention has a condensing area for reflected light emitted from a first light source and reflected by a reflecting mirror. A vehicle headlamp that obtains a desired light distribution pattern by projecting the light-shielding edge of a nearby light-shielding body forward using a projection lens, the vehicle headlamp facing the projection lens of the light-shielding body. A second light source is provided close to the surface, and only the first light source is turned on to emit a passing beam, and only the second light source or the first light source and the second light source are turned on to emit a passing beam. It is designed to perform irradiation.

Therefore, according to the vehicle headlamp of the present invention, it is possible to emit not only a low beam but also a driving beam.

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

(F-1 First Example) [Figures 1 to 3
] Figures 1 to 3 show the first part of the vehicle headlamp of the present invention.
Example 1 is shown. Note that this Example 1
The present invention is applied to an automobile headlamp.

(a Reflector) 2 is a reflector that reflects the light from the first light source 3 disposed inside and directs the reflected light to a predetermined area in front (hereinafter referred to as "condensing area"). It has a reflective surface 4 that functions to condense light. Preferably, the light condensing area extends in the left-right direction as indicated by 5 in FIG.

Such reflective surfaces include, for example, a composite reflective surface of a hyperbola and an ellipse (the horizontal cross-sectional shape is a hyperbola and the vertical cross-sectional shape is an ellipse), a composite reflective surface of a parabola and an ellipse (the horizontal cross-sectional shape is a parabola, and the vertical cross-sectional shape is an ellipse). )
and other various composite reflective surfaces are applicable.
Of course, a spheroidal reflecting surface is also applicable.

(b Light shielding body) 6 is a light shielding body arranged in front of the reflecting mirror 2. The upper edge 7 of this light shielding body 6 serves as a light shielding edge, and the light shielding edge 7 is located near the condensing area 5 of the light reflected by the reflecting mirror 1.

Furthermore, the light shielding edge 7 of the light shield 6 has two parts 7.
a and 7b are arranged side by side.
One of them 7a defines a horizontally extending edge, and the other 7b defines a diagonal edge that descends downward as it goes to the left from the boundary point 7c with 7a.

8 is close to the front surface of the light shielding body 6 and is located near the light shielding edge 7
This is a second light source located at a slightly lower position.

(c Projection Lens) 9 is a projection lens arranged in front of the light shielding body 6, and has a convex lens shape. The focal point Fc of the projection lens 9 is located at approximately the midpoint 7c of the light shielding edge 7.

(d Effect) However, in the above vehicle headlight 1, the first
When the light source 3 is turned on, the light is focused on a condensing area 5 by the reflecting surface 4 of the reflecting mirror 2. Since the light shielding body 6 is arranged so that the light shielding edge 7 is located near the light collecting area 5, and the focal point Fc of the projection lens 9 is located on the light shielding edge 7,
An image near the light shielding edge 7 of the light shielding body 6 and the light located above the light shielding edge 7 are projected forward by the projection lens 9, and a passing beam is formed by the light distribution pattern 10 as shown in FIG. 3A. Irradiation is performed. In addition, 11
is a light-dark boundary line defined by the light-shielding edge 7 of the light-shielding body 6, the portion 11a is defined by the horizontal edge 7a of the light-shielding edge 7, and the portion 11b is defined by the inclined edge 7b of the light-shielding edge 7. Each is limited.

Next, when irradiating with a traveling beam, the second light source 8 is also turned on in addition to the first light source 3. As a result, in addition to the light distribution pattern 10, the light from the second light source 3 is also projected forward by the projection lens 9, resulting in a light distribution pattern 12 shown in FIG. 3B.
will be projected.

(F-2 Second embodiment) [Figures 4 to 6
] Figures 4 to 6 show the second part of the vehicle headlamp of the present invention.
This is an example of the following.

The following embodiments and modifications including this second embodiment are different from the first embodiment 1 only in the second light source, and the other parts are the same as in the first embodiment 1.
Therefore, the same parts are given the same reference numerals as those given to the similar parts in the first embodiment, and detailed explanation thereof will be omitted.

(a Configuration) In this second embodiment 1A, the second light source 13
consists of a reflective surface formed on the front surface of a light shielding body and a light source body.

Reference numeral 14 denotes a light-shielding body, the upper edge 7 of which is a light-shielding edge. A reflective surface 15 is formed on the front surface of the light shield 14. As the reflecting surface 15, any suitable surface such as a hyperbolic surface or a paraboloid surface can be used as long as it can reflect light from a light source body, which will be described later, toward the projection lens 9.

16 is a light source, for example, a filament of a light bulb. The light source body 16 is arranged in front of the reflective surface 15.

(B Effect) In this second embodiment 1A, when the light source body 16 of the second light source 13 is turned on, not only the direct light but also the reflected light reflected by the reflective surface 15 is reflected by the projection lens 9. is irradiated towards, and
It is projected forward by the projection lens 9.

As shown in FIG. 6, a light distribution pattern 17 is formed by direct light from the light source 16, and a light distribution pattern 18 is formed by reflected light. still,
At this time, the first light source 3 may also be turned on at the same time.

Thus, when the first light source 3 is turned on, a passing beam is irradiated, and when the second light source 13 is turned on, a traveling beam is irradiated.

F-3 Third embodiment [Figures 7 to 10] Figures 7 to 9 show the third embodiment of the vehicle headlamp of the present invention.
Example 1B is shown.

(a Configuration) 19 is a second light source. The second light source 19
consists of a small mirror provided near the light-shielding edge on the front surface of the light-shielding body, a second reflecting mirror, and a light source body provided within the second reflecting mirror.

A small mirror 20 is provided at a portion of the front surface of the light shielding body 21 that is in contact with the light shielding edge 7, particularly in a portion that is in contact with the central portion 7c of the light shielding edge 7.

A second reflecting mirror 22 has a reflecting surface 23 having a convergence point such as, for example, an ellipsoid of revolution.

24 is a light source, and the reflecting surface 23 is, for example,
If it is an ellipsoid of revolution, it is placed at its first focus f. Therefore, if the second focal point f of the reflective surface 23 is located near the reflective surface of the small mirror 20, the reflected light emitted from the light source 24 and reflected by the reflective surface 23 of the second reflective mirror 22 will be The light is focused on the reflective surface of the small mirror 20.

If the normal 25 of the small mirror 20 is made to coincide with the bisector of the angle formed by the optical axis 26 of the projection lens 9 and the optical axis 27 of the second reflecting mirror 22, the light source 24 can be The light reflected by the emitting reflector 22 is reflected by the small mirror 20 and directed towards the projection lens 9.

(B Effect) When the light source body 24 of the second light source 19 lights up, the light is focused on the small mirror 20. Therefore, the small mirror 2 shining with that light
A pattern of 0 is projected forward by the projection lens 9, and irradiation is performed according to the light distribution pattern 28 shown in FIG. 9A. The light-dark boundary line 29 at the lower edge of this light distribution pattern 28 appears because there is no reflecting mirror above the light-shielding edge 7 of the light-shielding body 21.

Since the light distribution pattern of the passing beam emitted by lighting the first light source 3 is as shown in 30 shown in FIG. 9B, when emitting the traveling beam, the second light source 3 and the When the light source body 24 of the light source 19 is turned on, the light distribution patterns 28 and 3
0 is combined, and the traveling beam is irradiated according to the light distribution pattern 31 shown in FIG. 9C.

Note that the second reflecting mirror 22 may be arranged above the light shielding body 21 instead of below it, or alternatively, it may be arranged to the side.

(c Modification) [FIG. 10] FIG. 10 shows a modification 1B' of the third embodiment.

This modification 1B' has an intermediate mirror 32 interposed between the second reflecting mirror 22 and the small mirror.
The reflected light emitted from the light source 24 and reflected by the reflecting mirror 22 is reflected by the intermediate mirror 32 and guided to the small mirror 20, and its light distribution is the same as in the third embodiment 1B. The same is true.

The reason why the intermediate mirror 32 is used to change the optical path in the second light source is that the intermediate mirror 32 is used to change the optical path in the second light source.
This is convenient for selecting an appropriate placement space.

Note that it is also possible to use a plurality of intermediate mirrors 32.

(G Effect of the Invention) As is clear from the above description, the vehicle headlamp of the present invention includes a reflector that reflects light from the first light source and focuses the reflected light forward; A vehicle headlamp comprising: a light-shielding body with a light-shielding edge located near the condensing area of the reflected light; and a projection lens placed in front of the light-shielding body and having a focal point near the light-shielding edge of the light-shielding body. The present invention is characterized in that a second light source is provided close to the surface of the light shield that faces the projection lens.

Therefore, according to the vehicle headlamp of the present invention, only the first light source is turned on to emit a passing beam, and only the second light source or the first light source and the second light source are turned on.
The traveling beam can be irradiated by turning on the light source.

[Brief explanation of the drawing]

Figures 1 to 3 show a first diagram of a vehicle headlamp according to the present invention.
Fig. 1 is a schematic perspective view, Fig. 2 is a schematic vertical sectional view, Fig. 3 is a light distribution pattern diagram,
4 to 6 show a second embodiment of the vehicle headlamp of the present invention, and FIG. 4 is a perspective view of a light shield;
FIG. 5 is a schematic vertical sectional view, FIG. 6 is a light distribution pattern diagram, and FIGS. 7 to 9 show a third embodiment of the vehicle headlamp of the present invention, and FIG. 7 is a schematic perspective view. figure,
FIG. 8 is a schematic vertical sectional view, FIG. 9 is a light distribution pattern diagram, FIG. 10 is a schematic perspective view showing a modification of the third embodiment, and FIG. 11 is an example of a conventional vehicle headlamp. FIG. Explanation of symbols, 1... Vehicle headlight, 2... Reflector, 3... First light source, 5... Light condensing area, 6... Light blocking body, 7... Light blocking edge, 8... Third 2 light source, 9...
Projection lens, 1A... Vehicle headlamp, 13... Second light source, 14... Light blocking body, 1B... Vehicle headlamp, 19... Second light source, 21... Light blocking body, 1
B'...Vehicle headlight.

Claims (1)

[Scope of Claims] 1. A reflecting mirror that reflects light from a first light source and focuses the reflected light forward, and a light shielding member having a light shielding edge located near a convergence area of the reflected light; A vehicle headlamp comprising: a projection lens disposed in front of the light shield, the focal point of which is located near the light shield edge of the light shield; A vehicle headlamp characterized by being equipped with a light source.