JPS6020241Y2 - vehicle headlights - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a new vehicle headlamp, and more specifically, in a vehicle headlamp equipped with a light-shielding cap that covers the front part of the filament, the inner surface of the light-shielding cap is An object of the present invention is to provide a novel vehicle headlamp that prevents the generation of upwardly scattered light due to reflected light from the filament and makes effective use of the light emitted from the filament.

[Background technology and its problems]

In vehicle headlights, it is necessary to ensure that the passing beam emitted when passing an oncoming vehicle or driving in an urban area does not include light that would dazzle the driver of an oncoming vehicle or pedestrians. Therefore, a light distribution pattern is created in which light traveling above the horizontal line on the opposite lane side is cut off.

Therefore, in order to prevent such upward irradiation light from coming out of the reflected light, the lower half of the passing beam filament, which is placed slightly in front of the focal point of the parabolic reflector, is covered. .

Also, among the light that is emitted directly forward from the filament, the light that is emitted upward from the horizon dazzles oncoming drivers and pedestrians, and causes a film phenomenon during fog or light rain. A light blocking cap may also be used to cover the front of the passing beam filament.

FIG. 1 is a model diagram illustrating the relationship between a conventional example of such a vehicle headlamp and light distribution.

In FIG. 1, the right side is a schematic cross-sectional view of the headlight.
It shows the state with the lens removed, and the left side shows the light distribution pattern by the passing beam filament without passing through the lens, ■-V is a vertical line passing through the center of the front of the track, H-H is the direction It shows a horizontal line across the front.

a is a substantially paraboloid-shaped reflector, b is a light bulb attached to reflector a, C is a traveling beam filament located inside the light bulb and placed at the focal point of reflector a, and d is a traveling beam. The filament for the passing beam is placed slightly in front of the filament C, and the area below the filament d is the shade e.
covered by.

f is a substantially hemispherical metal light-shielding cap, which is fixed to the reflecting mirror a by two integrally formed legs g9g and arranged to cover the front part of the low beam filament d.

With this configuration, the light distribution pattern h shown on the left side of FIG. 1 should be obtained by the light emitted from the passing beam filament d without passing through the lens.

However, when the conventional light-shielding cap f shown in FIG. 2 is used, an extra area L i shown by diagonal lines on the left side of FIG.
The irradiation light is generated, and this becomes the dazzling light mentioned above, which is not preferable.

That is, since the inner surface of the light-shielding cap f is a concave spherical surface, the light j that comes out from the filament d and goes to the inside of the light-shielding cap f is reflected toward the reflecting mirror a, and then towards the areas i and i. It will be irradiated.

In addition, in the above-mentioned conventional example, as shown in FIG.
Only part 18 of the inner surface could be effectively used.

[Purpose of invention]

Therefore, the present invention prevents the inner surface of the light-shielding cap from acting as a secondary light source by devising the shape of the light-shielding cap, thereby preventing the irradiation of light that would dazzle oncoming drivers and pedestrians. Another object of the present invention is to provide a novel vehicle headlamp that can more effectively utilize the light emitted from the filament.

[Summary of the idea]

The present invention was devised in view of the above-mentioned problems, and consists of a reflecting mirror having a reflective inner surface shaped like a paraboloid of revolution, a filament placed near the focal point of the reflecting inner surface of the reflecting mirror, and a light-shielding device that covers the front part of the filament. The light shielding cap has a truncated conical shape, the small diameter side is closed and the large diameter side is open, and the side wall of the light shielding cap is arranged facing the open end side or rearward. Most of the light reflected by.

has an inclination angle such that it does not face the reflecting mirror, and is further characterized in that notches are formed on both left and right sides of the open end.

Therefore, according to the vehicle headlamp of the present invention, the light-shielding cap is shaped like a truncated cone, and its side wall is formed at an inclination angle such that most of the light reflected from the inner surface of the side wall does not go toward the reflecting mirror. Therefore, the light emitted from the filament and reflected on the inner surface of the light-shielding cap is not directed toward the reflective inner surface of the reflecting mirror, and does not become a so-called harmful ray.

In addition, notches are formed on both left and right sides of the open end of the truncated conical light-shielding cap, allowing the light emitted from the filament to pass through the notches, making the reflective inner surface of the reflecting mirror wider and more effective. can be used.

〔Example〕

The details of the vehicle headlamp of the present invention will be explained below in detail according to the illustrated embodiments.

FIG. 3 is a longitudinal sectional view showing the main parts of the vehicle headlamp of the present invention.

Reference numeral 1 denotes a reflecting mirror, which has a reflecting inner surface 2 in the shape of a substantially paraboloid of revolution and a light bulb mounting hole 3.

Reference numeral 4 denotes a light bulb mount which is removably attached to the light bulb mount hole 3 of the reflecting mirror 1 by appropriate known means, and the light bulb 5 is attached to the reflecting mirror 1 via the light bulb mount 4.

The light bulb 5 may be any suitable one, but here it is an H-based halogen light bulb according to the ECE standard with a flange on the base.

Various methods have been proposed for holding such an H4 type light bulb 5 in the light bulb mount 4, and an appropriate method may be selected from among them.

It should be noted that it is not always necessary to use an H4 type light bulb when implementing the present invention.

Inside the glass bulb 6 of the light bulb 5, there is a running beam filament 7, a passing beam filament 8 slightly in front of the running beam filament 7, and a shade 9 covering the lower half of the passing beam filament 8. When the light bulb 5 is attached to the reflecting mirror 1 via the light bulb mount 4, the traveling beam filament 7 is at the approximate focal point of the reflecting inner surface 2, and the passing beam filament 8 is at the reflecting mirror 1. It will be placed slightly forward of the focal point of the inner surface 2.

Reference numeral 10 denotes a metal light-shielding cap arranged to cover the front part of the low beam filament 8, and has a substantially truncated conical shape, with the small diameter side closed and the large diameter side open.

In addition, notches 1 are provided on both left and right sides of the open end of the light shielding cap 10.
1 and 11 are formed, and the right and left sides of the reflective inner surface 2 can be seen from the passing beam filament 8 through these notches 11 and 11.

12. 12 is a leg piece for holding the light-shielding cap 10 on the reflecting mirror 1, and a notch 11.12 at the rear end of the light-shielding cap 10. jl
It integrally extends rearward from an appropriate location other than the L-shaped portion.

Bent pieces 13.13 are formed at the rear ends of the leg pieces 12.12 and bent in opposite directions.
．． An overhanging piece 14.14 is provided at a position slightly forward of 13 and overhangs laterally from both side edges, and the overhanging pieces 14, 14 and 14.14 are bent in the same direction as the bent side 13.13, In each leg piece 12, an appropriate interval is formed between the rear end of the overhanging pieces 14, 14 and the bent piece 13.

At the rear end of the light bulb holder 4, there is a flange 1 extending outward.
5 is formed.

Grooves 16 are formed on the outer circumferential surface of the light bulb holder 4 and extend in the front-rear direction at 180° from each other, and the rear ends of the grooves 16 are connected to the notches formed on the outer edge of the rear end surface of the light bulb holder 4. 17 in a row.

As a result, the bent piece 13 formed at the rear end of the leg piece 12 of the light shielding cap 10 fits into the notch 17 formed at the outer edge of the rear end surface of the light bulb holder 4, and the rear end of the overhanging piece 14. engages the front face of the bulb holder 4, and both pieces 13 and 14.14
The part between is fitted into the groove 16.

In this way, the light-shielding cap 10 is attached to the light bulb mount 4, and the light-bulb mount 4 is attached to the reflector 1, so that the light-shielding cap 10 is
0 is attached to the reflector 1.

[Effect of idea]

As explained above, in the vehicle headlamp of the present invention, the light-shielding cap covering the front part of the low beam filament has a truncated conical shape, and its side wall reflects most of the light reflected from the inner surface of the side wall. Since it is formed at an angle of inclination that does not face the mirror, as shown in FIG. Even if it is done,
Since the light does not go toward the reflective inner surface 2 but further toward the inner surface of the light shielding cap 10, even if it repeatedly reflects and exits the light shielding cap 10, by that time it has already been sufficiently diffused and attenuated and does not become a harmful ray. .

Furthermore, when the conventional light-shielding cap f shown in FIG. 2 is used, the light from the filament d for passing beams only reaches a portion 18 of the inner surface of the reflecting mirror a shown by diagonal lines downward to the left, as shown in FIG. 13. Although only the portion 18 of the inner surface of the reflecting mirror a is effectively used, the light shielding cap 10 in the present invention
Since notches 11, 11 are formed on both left and right sides of the open end side, as shown in FIG. The part 19 passing through 11 and indicated by the diagonal line downward to the right.
19, a wider portion of the reflective inner surface 2 is effectively used.

The reason why the light is not directed to the upper both sides 20 and 20 of the reflective inner surface 2 is because the corners of the reflective inner surface 2, which has a rectangular front shape, are prone to distortion during molding and do not require the use of highly accurate paraboloids. This is because the reflected light at such portions 20 and 20 becomes scattered light.

In addition, in FIGS. 13 and 14, the usable surface of the reflecting mirror a or the reflecting inner surface 2 extends further downward on the left side, but this is a characteristic of driving on the left side of the vehicle. This is achieved by shifting the shoulders slightly below the horizontal line.

[Brief explanation of the drawing]

Figure 1 is a model diagram showing a conventional vehicle headlamp and its light distribution, Figure 2 is a perspective view of a light shielding cap of a conventional vehicle headlamp, and Figure 3 is a schematic diagram of the vehicle headlight of the present invention. Main part longitudinal sectional view, No. 4
Figures 11 to 11 show the light-shielding cap of the vehicle headlamp of the present invention, where Figure 4 is a perspective view, Figure 5 is a front view, Figure 6 is a right side view, Figure 7 is a left side view, and Figure 7 is a left side view. Figure 8 is a plan view, Figure 9
The figure is a bottom view, Figure 10 is a rear view, Figure 11 is M of Figure 5.
12 is a perspective view showing the relationship between the light shielding cap leg piece and the light bulb mount, (4) shows before installation, (B) shows after installation, and FIG. 13 is a sectional view taken along line -M. 14 is a front view showing how the reflective inner surface is used in a conventional vehicle headlamp, and FIG. 14 is a front view showing how the reflective inner surface is used in the vehicle headlamp of the present invention. Explanation of symbols, 1...Reflector, 2...Reflecting inner surface, End...Filament for passing beam,
10... Light-shielding cap, 11... Right and left notches.

Claims (1)

[Scope of utility model registration request] It includes a reflecting mirror having a reflective inner surface in the shape of a paraboloid of revolution, a filament disposed near the focal point of the reflecting inner surface of the reflecting mirror, and a light-shielding cap that covers the front part of the filament, and the light-shielding cap has a truncated cone shape. The small-diameter side is closed and the large-diameter side is open, and the open end side is arranged facing rearward, and the side wall of the light-shielding cap is such that most of the light reflected on the inner surface of the side wall is directed toward the reflecting mirror. 1. A vehicular headlamp, which has an inclination angle such that there is no angle of inclination, and further has notches formed on both left and right sides of the open end.