JPH02177203A - Front lighting device for vehicle - Google Patents

Abstract

PURPOSE:To improve the visibility which makes it easier to confirm direction of turning when a car is banked excessively by arranging many small holes or notches in the upper portion of a shielding plate of a projector-type front light in a direction of width. CONSTITUTION:Small holes 5 are arranged in the upper portion of a shielding plate 4 in a direction of width. Notches or a combination of holes and notches may be used instead of holes 5. The light from an electric lamp 2 is reflected by a reflecting mirror 1, passes through a second focus f2, and is then turned into parallel rays of light by a lens 3. The light below the focus f2 is cut off by the shielding plate 4, but the light leaking from the holes 5 dimly illuminates a non-illumination portion which is an upper half with reference to an optical axis L. This dim illumination is adjusted by the number, size and pitch of the holes 5. This arrangement makes it easier to confirm direction of turning through positive illumination when a car is banked excessively for turning. Additionally, dim illumination is directed diagonally upwards, ensuring improved visibility even when car-height is low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vehicle headlamp device, and more particularly to an improvement in a headlamp device constituted by a so-called projector type headlamp.

(Prior art) Conventionally, the headlights commonly used for vehicles are:
The mainstream structure was to have a reflecting mirror with a paraboloid, a light bulb at the focal point of the paraboloid, and a lens in front of it. In contrast, recently, a so-called projector-type headlamp in which the reflecting mirror is formed of an elliptical surface of a spheroid has been proposed.

This projector-type headlamp is shown in FIG. 5A.

As illustrated in B, the reflecting mirror 1 is formed of a part of an ellipsoid, and the light bulb 2 is placed at the first focal point f, which is close to the reflecting mirror 1, of the two focal points f+ and fz of the spheroid. A lens 3 is arranged in front of the lens 3 so that its focal point coincides with the second focal point f2. Furthermore, in the case of anti-glare for oncoming vehicles, a shielding plate 4 designed to block upward light is installed at the second focal point f2 as shown in the figure.

When a projector-type headlight with such a configuration is turned on, the light emitted from the bulb 2 is reflected by the reflector 1, passes through the second focal point f2, and then becomes a parallel beam when passing through the lens 3 and is directed forward. irradiate. In addition, when the shielding plate 4 of the anti-glare mechanism is provided, the light passing below the second focal point f2 is blocked, and the upward light emitted from the lens 3 is cut off, causing the oncoming vehicle to It is possible to provide anti-glare.

This projector-type headlight has an ellipsoidal reflector, so the diameter on the first side is smaller than that of a headlight with a parabolic reflector, so even when emitting the same amount of light, the diameter is smaller. It has the advantage of being able to In addition, since the lens forces the light beam into parallel light, it reduces the diffusion of light compared to a parabolic reflector headlight, and the boundary between illuminated and non-illuminated areas is clearly distinguished from bright and dark. The feature is that it has a sharp cut line and can emit strong light over a long distance.

In fact, in the case of a headlamp equipped with an anti-glare shielding plate 4,
On the other hand, the latter feature mentioned above may have the following drawbacks.

In other words, in vehicles such as motorcycles that bank the vehicle body left and right when cornering, the headlights also tilt left and right due to the bank, so you want to turn toward the dark side (upper side) of the horizontal light-dark cut line. Sometimes the direction is hidden, making it difficult to see.

Furthermore, in a vehicle with a low vehicle height such as a motorcycle, the position of the eyes of a person walking in the opposite direction in front of the vehicle may be above the horizontal light-dark cut line. In such a case, it becomes difficult for people walking from the front to see the motorcycle, resulting in poor visibility.

[Problem to be solved by the invention]

An object of the present invention is to make it easier to see the direction of a turn (and to improve visibility) in a vehicle equipped with the above-mentioned anti-glare projector type headlight. An object of the present invention is to provide a projector-type headlamp device configured to do the following.

[Means to solve the problem]

The present invention achieves the above object by using a part of an elliptical surface as a reflecting mirror, placing a light bulb at a first focal point located close to the reflecting mirror, and passing below the focal point to a second focal point located far away. A projector-type headlamp in which a shielding plate for blocking light is disposed, and a lens that forms part of the second focal point and the lens focal point is disposed in front of the shielding plate, and a large number of minute holes are provided in the upper part of the shielding plate. Alternatively, it is characterized in that the notches are arranged in the width direction.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the figures.

FIG. 1 shows a projector-type headlamp according to an embodiment of the present invention, in which numeral 1 indicates a reflecting mirror having an ellipsoidal surface, numeral 2 a light bulb for main irradiation, numeral 3 a lens, and numeral 4 a shielding plate. The configuration based on these is shown in FIG. 5A described above.

It has substantially the same structure as B. In particular, the reflecting mirror 1 is made up of a combination of a plurality of spheroidal bodies, and is configured so that its aperture is larger in the width direction than in the vertical direction.

As shown in FIG. 2, a large number of minute holes 5 are provided in the upper part of the shielding plate 4 so as to be arranged along the width direction. This minute hole 5 does not necessarily have to be a hole as shown in FIG. 2, but rather a large number of minute notches arranged in an uneven pattern along the upper edge of the shielding plate 4, as shown in FIG. 6, or as shown in FIG. 4, the holes 5 and notches 6 may be mixed together.

When this projector-type headlamp is turned on, the light emitted from the bulb 2 is reflected by the reflector 1, passes through the second focal point f2, and then passes through the lens 3, as explained in FIGS. 5A and 5B. When it passes through, it becomes a parallel beam of light and illuminates the front. At this time, the light passing below the second focal point f2 is blocked by the shielding plate 4, so the upward light emitted from the lens 3 becomes cut irradiation light. Since these holes 5 are arranged so as to be arranged in the width direction, some light leaks from these holes 5 and passes through the lens 3.

Since the light leaking from this hole 5 travels as shown by the chain line in FIG. 1, it illuminates the upper half of the non-irradiated portion from the optical axis as faint light.

In other words, a faintly blurred irradiated portion is formed in the non-irradiated portion near the cut line. Of course, the intensity of this blurred irradiation is weaker than that of the main irradiation portion, and its intensity can be easily adjusted by appropriately selecting the number, size, position, pitch, etc. of the holes 5.

Therefore, when the above-mentioned headlight is attached to a vehicle that banks widely, such as a motorcycle, even if the bright/dark cut line of the irradiation part is greatly inclined from the horizontal state during cornering, the blurred irradiation will cause the headlight to bend. It can provide sufficient illumination in a certain direction, and does not make it difficult to see in that direction like in the past.

In addition, since the dim light of the blurred irradiation described above travels diagonally upward, even if the headlight is installed on a low-height vehicle such as a motorcycle, it will not be possible to prevent people from walking (or walking) in front of the vehicle. Light can be made to reach the eye position, and visibility can be improved.

The effect of the blurred irradiation described above can be obtained in the same way when a shielding plate of the form shown in FIGS. 3 and 4 is provided.

[Effect of the invention] As described above, the present invention makes a part of the ellipsoid a reflecting mirror,
A light bulb is placed at a first focal point located close to the reflecting mirror, and a shielding plate is placed at a second focal point located far away to block light that passes below the focal point, and a light bulb is placed in front of the shielding plate. A blog with a lens that matches the bifocal and lens focal points! In the vector-type headlamp, a large number of minute holes or notches are arranged in the width direction in the second part of the shielding plate.

Therefore, in this headlamp, the light leaking from the 7L or notch provided in the 7th section of the shielding plate described above becomes a blurred irradiation area that faintly illuminates the non-irradiated area near the cut line when it exits the lens, which illuminates the vehicle body. Even if the vehicle is installed on a vehicle that is largely banked, the blurred irradiation reliably illuminates the 4° direction of the turn and makes that direction easier to see.

In addition, since the above-mentioned blurred irradiation proceeds diagonally upward, even if headlights are installed on a low-height vehicle, the blurred irradiation will also enter the eyes of people walking in the opposite direction. Visibility can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a projector-type headlamp according to an embodiment of the present invention, Fig. 2 is a rear view of the shielding plate as seen from the ■ arrow direction in Fig. 1, and Figs. 3 and 4 are respectively Rear view corresponding to FIG. 2 of a shielding plate according to another embodiment, FIGS. 5A and B
5A shows a conventional projector-type headlamp, FIG. 5A is a longitudinal sectional view, and FIG. 5B is a view taken along the line A--A in FIG. 5A. 1...Reflector, 2...Light bulb, 3...Lens, 4...
...shielding plate, 5...hole, 6...notch, f,...
First focal point, f2...second focal point. Figure 1 Figure Figure Figure (A) Figure (B)

Claims (1)

[Claims] A part of the ellipsoidal surface is used as a reflecting mirror, and the first
A light bulb is placed at the focal point, a shielding plate is placed at a distant second focal point to block light passing below the focal point, and a lens is placed in front of the shielding plate to make the second focal point coincide with the lens focus. In the projector type headlights installed,
A vehicular headlamp device in which a large number of minute holes or notches are arranged in the width direction on the upper part of the shielding plate.