JPS6240481Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a novel vehicle headlamp. Specifically, with regard to automobile headlights, the luminous flux used is increased, the overall brightness is bright, and no dazzling light is emitted to oncoming vehicles, and furthermore, it is possible to emit a passing beam with extremely good long-distance visibility. The aim is to provide a new vehicle headlight.

Background technology and its problems When it comes to automobile headlights, there is a need for driving beam irradiation capability, which is necessary when driving at high speeds in suburban areas or on expressways, and a passing beam irradiation capability, which is necessary when driving in urban areas or when passing oncoming vehicles. ability is necessary. In the case of passing beams, it is necessary not to emit light that dazzles the driver of an oncoming vehicle, and it is also necessary to brightly illuminate the area in front of the vehicle to improve visibility. be.

Therefore, in order to emit a passing beam suitable for the above-mentioned purpose, a conventional automobile headlamp has a structure as shown in FIG. 1.

A is a reflecting mirror, and its inner surface b is a paraboloid of revolution reflecting surface. c is a filament for the passing beam, and the central axis of the reflecting surface b, that is, the axis x- which is the rotation center when the parabola is rotated.
It is arranged along x and slightly ahead of the focal point F of the reflective surface b. The light emitted from the filament c in this arrangement and reflected by the reflecting surface b has a tendency to converge with respect to the central axis x-x. axis x
-x is irradiated at the reflection position and the target position. That is, the horizontal line H that intersects at right angles to the central axis x-x
-H and the vertical line V-V, the light reflected on the first quadrant of the reflective surface b is irradiated toward the third quadrant in front, and the light reflected on the reflective surface b
The light reflected on the second quadrant of the reflecting surface b is irradiated toward the fourth quadrant in front, and the light reflected on the third quadrant of the reflecting surface b is irradiated toward the first quadrant in front of the reflecting surface b. The light reflected from the fourth quadrant is directed toward the second quadrant in front.

d is a light shielding body that covers the front and substantially lower half of the filament c. The light emitted directly forward from the filament c is blocked by the portion e of the light shield d that covers the front part of the filament c, and only the light reflected by the reflective surface b is emitted forward. It turns out. Also, since the lower half of the filament c is covered by the light shield d, the filament c
Since the light directed toward the lower half of the reflective surface b, that is, the third and fourth quadrants, is blocked, the light that is irradiated upward from the first and second quadrants in front, that is, the horizontal line H-H, is blocked. There will be almost no.

However, if there is no light emitted toward the far side of the driving lane, that is, toward the second quadrant, visibility of the road ahead will be insufficient. Therefore, the side edge f of the light shield d on the opposite lane side is positioned below the horizontal plane passing through the central axis x-x. The amount of downward deviation is determined by the angle α formed between the plane including the side edge f and the central axis x-x and the horizontal plane including the central axis x-x.
゜.

Therefore, the light will go to the fourth quadrant of the reflective surface b by the amount that the edge f on the opposite lane side of the light shielding body d is deflected downward, and the light will go to the second quadrant ahead by that amount. The light will also be irradiated.

g is a lens that covers the front opening of reflector a,
A large number of lens elements are formed to refract and/or diffuse light, thereby appropriately controlling the light to obtain a desired light distribution pattern.

FIG. 2 shows a light distribution pattern h in the vehicle headlamp shown in FIG. 1 when the light does not pass through the lens g. In other words, the first quadrant is not irradiated with light at all, the third and fourth quadrants are mainly irradiated, and the second quadrant is irradiated with light by an amount corresponding to the downward deviation of the edge f on the opposite lane side of the light shield d. A small amount of light is emitted. That is, in the second quadrant, a portion below a certain line i extending from the central axis xx is irradiated with light. and,
The angle α that this upper limit line i makes with the horizontal line H-H is the angle α that the plane that includes the edge f on the opposite lane side of the light shielding body d and the center axis x-x makes with the horizontal plane that includes the center axis x-x. It's the same. Then, the irradiated light is controlled by the lens g so as to constitute the light distribution pattern h shown in FIG. 2, and a light distribution pattern j of passing beams as shown in FIG. 3 is obtained.

By the way, the above-mentioned conventional vehicular headlamps with low beams have problems in that the usable luminous flux is small, the entire vehicle is dark, and the long-distance visibility on the driving lane side is not sufficient.

That is, the upper limit line i in the second quadrant of the original light distribution pattern h before being controlled by the lens g is a line extending straight from the intersection of the horizontal line H-H and the vertical line V-V. Moreover, this upper limit line i and horizontal line H
If the angle α formed with -H is increased, the light will be irradiated quite far into the sky, which is undesirable as it may cause a light curtain phenomenon. Therefore, this upper limit line i
The angle α formed by the horizontal line H-H cannot be made too large, and as mentioned above, the upper limit is about 15 degrees.
Then, there is a problem in that in the second quadrant, a portion closer to the vertical line VV is hardly irradiated with light, and a portion closer to the oncoming lane in front of the road is not sufficiently irradiated.

Purpose of the invention The present invention was devised in view of the above-mentioned problems with conventional vehicle headlights.The present invention increases the luminous flux used, brightens the entire vehicle, and emits dazzling light for oncoming vehicles. It is an object of the present invention to provide a novel vehicle headlamp that can emit a passing beam with very good long-distance visibility.

Summary of the invention In order to achieve the above-mentioned purpose, the vehicle headlamp of the present invention includes a filament that extends near the focal point of a paraboloid of revolution reflection surface and approximately along the central axis of the reflection surface, and a front surface of the filament. and a light shielding body that covers approximately the lower half of the light shielding body, and a side edge of the light shielding body on the opposite lane side is formed from a horizontal plane including the central axis to a plane including the side edge and the central axis and the horizontal plane. Angle θ
is located below so that it is in the range of 60° to 10°, and the θ is large at the front and small at the rear.

Embodiments Hereinafter, details of the vehicle headlamp of the present invention will be explained according to illustrated embodiments.

Reference numeral 1 denotes a reflecting mirror, the inner surface 2 of which is a paraboloid of revolution reflecting surface. Reference numeral 3 denotes a filament for a passing beam, which is disposed along the central axis xx of the reflecting surface 2 and slightly ahead of the focal point F of the reflecting surface 2.

Reference numeral 4 denotes a light shielding body that covers the front and substantially lower half of the filament 3. Light emitted directly forward from the filament 3 is blocked by the portion 5 of the light shielding body 4 that covers the front part of the filament 3, and only the light reflected by the reflective surface 2 is emitted forward. It turns out. In addition, since substantially the lower half of the filament 3 is covered by the light shielding body 4, light from the filament 3 toward the lower half of the reflective surface 2, that is, the third and fourth quadrants, is blocked. 1st and 2nd
Almost no light is irradiated upward from the quadrant, that is, the horizontal line H-H.

However, if there is no light emitted toward the far side of the driving lane, that is, toward the third quadrant ahead, visibility of the road ahead will be insufficient. Therefore, the side edge 6 of the light shield 4 on the opposite lane side is located below the horizontal plane passing through the central axis xx. The amount of downward deviation is divided into three stages. Note that the amount of deviation is indicated by the angle θ formed between a plane including the side edge 6 and the central axis x-x of the reflective surface 2 and a horizontal plane including the central axis x-x. The edge 6 on the opposite lane side of the light shielding body 4 is divided into three parts 6 ₁ , 6 ₂ and 6 ₃ from the front. The deviation amount θ ₁ of the first portion 6 ₁ , the deviation amount θ ₂ of the second portion 6 ₂ , and the deviation amount θ ₃ of the third portion 6 ₃ are such that θ ₁ >θ ₂ > θ ₃
It is designed to create a relationship of For example, θ ₁
= 45°, θ ₂ = 30°, and θ ₃ = 15°. still,
These θ must be within the range of 60°≧θ≧10°. If θ is 60° or more, strong light will be emitted close to the oncoming lane, and there is a risk that it will dazzle the driver of the oncoming vehicle. Also, if θ is less than 10°, the horizontal line H-H on the driving lane side
Irradiation further upward becomes insufficient.

7 is a lens that covers the front opening of the reflecting mirror 1;
A large number of lens elements (not shown) are formed to refract and/or diffuse light, thereby appropriately controlling the light to obtain a desired light distribution pattern. .

Figure 7 shows lens 7 in the vehicle headlight of the present invention.
This shows a light distribution pattern 8 when no light passes through. In this light distribution pattern 8, the first quadrant is not irradiated with light at all, the third and fourth quadrants are mainly irradiated with light, and the second quadrant is irradiated with light on the opposite lane side edge 6 of the light shield 4. Light is emitted by the amount of light that is shifted downward. That is, in the second quadrant, the portion below the upper limit line 9 is irradiated with light. The upper limit line 9 includes three portions 9 ₁ , 9 ₂ and 9 ₃ , each of which corresponds to the edge 6 of the light shield 4 on the opposite lane side. That is, 9
₁ becomes 6 ₁ , 9 ₂ becomes 6 ₂ , and 9 ₃ becomes 6 ₃
is supported. Therefore, each part 9 ₁ , 9 ₂ ,
The angle that 9 ₃ makes with the horizontal line HH substantially corresponds to the amount of deviation of the edge 6 of the light shield 4 on the opposite lane side. That is, the inclination angle of the upper limit line ₉₁ with respect to the horizontal line H-H is _θ1 , the inclination angle of the upper limit line ₉₂ with respect to the horizontal line H-H is _θ2 , and the inclination angle of the upper limit line ₉₃ with respect to the horizontal line H-H is _θ3 . Become. However, θ ₁ >
There is a relationship of θ ₂ > θ ₃ because the angle of inclination of the upper limit line 9 ₁ with respect to the horizontal line H-H increases in the part close to the vertical line V-V in the second quadrant. While sufficient irradiation is carried out even to the point, the angle of inclination of the upper limit line ₉₃ with respect to the horizontal line H-H is made small at a point far from the vertical line V-V. Irradiation can be avoided. Therefore, if this light distribution pattern 8 is controlled by the lens 7, a light distribution pattern 10 of passing beams as shown in FIG. 7 can be easily obtained. In the light distribution pattern 10 of the passing beam shown in FIG. 7, in the second quadrant, a substantially trapezoidal pattern protruding from the horizontal line H-H is irradiated, and from the side of the oncoming lane in front of the road to the road shoulder. Visibility will be greatly improved.

Effects of the Invention As is clear from the above description, the vehicle headlight of the present invention includes a filament that extends near the focal point of the paraboloid of revolution reflection surface and approximately along the central axis of the reflection surface; a light shielding body that covers the front surface and substantially the lower half of the light shielding body, and a side edge of the light shielding body on the opposite lane side is closer to a plane that includes the side edge and the central axis than a horizontal plane that includes the central axis. It is characterized in that it is positioned downward so that the angle θ is in the range of 60° to 10°, and that the angle θ is large at the front and small at the rear.

Therefore, according to the vehicle headlight of the present invention, the available luminous flux is increased and the whole is bright, and it does not emit dazzling light to oncoming vehicles, and furthermore, it emits a passing beam with extremely good long-distance visibility. be able to.

In the description of the above embodiment, the amount of deviation of the edge of the light shield on the opposite lane side is changed in stages, but if the amount of deviation is large at the front and small at the rear, , may be changed continuously.

Furthermore, in the above embodiments, a filament for a running beam is not shown, but a filament for a running beam may be included.

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional vehicle headlamp, Figure A is a partially cutaway front view, Figure B is a longitudinal sectional view, and Figure 2 is a front view of the vehicle headlight shown in Figure 1. FIG. 3 is a perspective view showing the light distribution pattern when the illumination light does not pass through the lens together with the filament; FIG. 3 is a diagram showing the light distribution pattern using the vehicle headlight shown in FIG. 1;
4 to 6 show an example of implementation of the vehicle headlamp of the present invention, FIG. 4 is a partially cutaway front view, and FIG. 5 is a cross section taken along line A-A in FIG. 4. 6 is a sectional view taken along the line B-B in FIG. 4, FIG. 7 is a perspective view showing the light distribution pattern of the vehicle headlamp of the present invention without passing through the lens, together with the filament, and FIG. FIG. 2 is a diagram showing a light distribution pattern of the vehicle headlight of the present invention. Explanation of symbols, 2... Reflective surface, 3... Filament, 4... Light blocking body, 6... Side edge of the light blocking body on the opposite lane side, F... Focal point of reflective surface, x-x... Reflective surface central axis.

Claims (1)

[Scope of utility model registration request] It is equipped with a filament that extends near the focal point of the paraboloid of rotation reflection surface and approximately along the central axis of the reflection surface, and a light shield that covers the front surface and approximately the lower half of the filament. The angle θ between the side edge and the plane containing the central axis and the horizontal plane is 60° to 60°.
1. A vehicle headlamp, characterized in that the θ is positioned downward within a range of 10°, and the θ is large at the front and small at the rear.