JPH0324001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle lamp, and particularly to a headlamp suitable for a vehicle whose body tilts when changing course, such as a two-wheeled vehicle.

[Prior Art] Conventionally, all vehicle headlights have the same structure regardless of whether they are for two-wheeled vehicles or four-wheeled vehicles, and the light distribution is slightly changed to accommodate differences in vehicle types. Ta. What is shown in FIG. 9 shows a typical structure of a conventional headlamp, and what is indicated by the reference numeral 1 in the figure is a reflecting mirror formed by a paraboloid of revolution. A light source 2, such as a light bulb, is disposed at or near the focal point of the lens, and a lens 3 is disposed in front of the focal point, so that the light radiated forward by the reflecting mirror 1 and the light source 2 can be appropriately distributed. It is assumed that it has optical properties. What is shown in FIG. 10 is an example of the above-mentioned light distribution characteristic, and as shown in the light distribution characteristic a, the vehicle is designed to stand upright,
The traveling beam, which is mainly used when traveling outside the field, is aligned with the horizontal line H as shown in b to illuminate a farther distance.
The passing beam is used mainly when driving in urban areas, and is designed so that it does not shine above the horizon H so as not to dazzle oncoming vehicles, as shown in Figure c. It is set as.

[Problems to be Solved by the Invention] The light distribution characteristics set as described above do not cause any inconvenience in a four-wheeled vehicle, for example, but in a two-wheeled vehicle, when turning As shown by a in FIG. 11, this is done by tilting the vehicle body, so that both the light distribution characteristic b of the headlight's running beam and the light distribution characteristic c of the passing beam of the headlights are tilted. Figure 12 shows a comparison of the light distribution characteristics when the vehicle is tilted and the light distribution characteristics when the vehicle is upright in a normal condition. The light distribution characteristics indicated by the symbol b are the light distribution characteristics when the vehicle body is tilted to the left in order to make a left turn. As is clear from the figure, the distance that the light travels in the direction of the turn is short, and as a result, the direction of travel is not sufficiently illuminated and becomes dark, and this tendency becomes stronger the sharper the turn is made. Therefore, this was a very big problem in terms of safe driving.

[Means for Solving the Problems] The present invention provides a reflector that reflects light forward, such as a paraboloid of revolution, and a focal point of the reflector or its focal point. In a two-wheeled vehicle headlight device comprising a light source disposed nearby, a reflecting mirror provided on the front surface, and a lens that obtains appropriate light distribution characteristics by using optical means for the light rays from the light source, the reflecting mirror is located at the center. The main reflecting mirror is opposed to a movable lens that mainly determines the light distribution characteristics, and the auxiliary reflecting mirror mainly controls the center illuminance. By providing a headlamp device for a two-wheeled vehicle, the movable lens is rotated in response to the output of a detector that detects the angle of inclination of the vehicle body. The above problem is solved by preventing the light distribution characteristics of the headlights from changing significantly even when the vehicle body is tilted for turning.

[Example] Next, the present invention will be described in detail based on an example shown in the drawings.

Further, in order to facilitate understanding, the same parts as in the conventional example will be described with the same reference numerals.

Fig. 1 shows an exploded view of the motorcycle headlamp device according to the present invention, and the reference numeral 1 in the figure is a reflector, and a light source such as a light bulb is located near the focal point of the reflector. 2, a movable lens 3A and a fixed lens 3B are arranged in front of it, and a waterproof lens 4 which also serves as a design is attached to the front. Furthermore, a motor 5 for rotating the movable lens 3A and a tilt sensor 6 such as a gyro device for driving the motor 5 are attached to the movable lens 3A.

What is shown in FIG. 2 is a more detailed view of the reflecting mirror 1, which consists of a reflecting mirror 1A located at the center and a reflecting mirror 1B located at the periphery, each of which is formed by a paraboloid of revolution. has been done. The reflecting mirror 1A located at the center is the main reflecting mirror, and the light distribution characteristics are determined by using the light reflected by the reflecting mirror 1A and the lens 3A, so that the beam mainly travels by passing beams. In recent years, as shown in FIG. 3, the passing beam filament S of the light source 2 is placed at the focal position of the reflecting mirror 1A with a focal length F1 and a downward angle of θ degrees, and is relatively horizontally moved. In combination with the movable lens 3A that performs wide diffusion, the light is distributed mainly in passing beams. The reflecting mirrors located at the periphery have a strong auxiliary character and are used to improve the central illuminance rather than the light distribution characteristics, and the main reflecting mirror 1A is mainly used for passing beams. When traveling with a traveling beam, the light distribution characteristics are somewhat dissatisfied, so this is to compensate for this, and for this purpose, as shown in Fig. 4, a reflector 1B with a focal length F2 and a downward angle ψ degrees The light source 2 is placed at the focal position of
A traveling filament M is placed therein, and is combined with the fixed lens 3B which provides relatively narrow diffusion in the horizontal direction. As explained above, it is the combination of the reflecting mirror 1A and the movable lens 3A that mainly determines the light distribution, so it is clear that by rotating the movable lens, the light distribution characteristics also rotate.

The method shown in FIG. 5 shows a method of rotating the movable lens, in which gears are formed on the shaft of the motor 5 and the outer circumference of the movable lens 3A, and gears are meshed with each other, so that the movable lens is rotated by the rotation of the motor 5. The movable lens 3A is rotated by an arbitrary angle, and the method shown in FIG. 6 is another method for rotating the movable lens 3A. It is something that is rotated.

[Function] The two-wheeled vehicle headlight device of the present invention has the above-described structure, so that the inclination angle of the vehicle body detected by the inclination sensor 6 is transmitted via the motor 5 to indicate, for example, when the vehicle body is tilted to the left (left turn). By rotating clockwise by the same angle as the angle at which the vehicle body is tilted, the movable lens 3A always remains horizontal with respect to the ground surface. Due to this effect, when the vehicle is traveling straight and is vertical, the light distribution characteristic A from the movable lens 3A and the light distribution characteristic B from the fixed lens 3B are obtained as shown in FIG. 7, which shows the same arrangement as the conventional example. When the vehicle body is tilted for turning, the light distribution characteristics are the same as those of conventional headlight devices, but as shown in Fig. By rotating the movable lens 3A that determines the light, a light distribution characteristic that is substantially the same as when traveling straight is obtained.

[Effects of the Invention] As explained above, by making the movable lens, which mainly determines the light distribution characteristics of the lens, rotate in response to the inclination of the vehicle body, the motorcycle headlamp device of the present invention has the following advantages. For example, even when the vehicle body is tilted to make a turn, the light distribution characteristics illuminating the entire surface remain substantially unchanged from when the vehicle is traveling straight. The light distribution characteristics change, and this change solves the extremely dangerous problem of light not reaching the most important direction of travel, and has a great effect on ensuring safe driving and preventing accidents. It is something that plays,
Furthermore, since the above effects can be achieved by moving only the movable lens, the weight of the movable parts can be kept to a minimum, making it possible to downsize the device, which has an excellent effect on improving practicality. They will be played together.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing the structure of a motorcycle headlamp device according to the present invention, Fig. 2 is a perspective view showing the structure of a reflector with some parts omitted, and Figs. 3 and 4 are light sources. FIG. 5 is an explanatory diagram showing one embodiment of a method of rotating the movable lens, FIG. 6 is an explanatory diagram showing another embodiment of the same rotation method, and FIG. 7 is a cross-sectional diagram showing the position of a reflecting mirror. Fig. 8 is an explanatory diagram showing the light distribution characteristics when the vehicle is upright, Fig. 9 is a sectional view showing the structure of the conventional example, and Fig. 10 is the conventional example. An explanatory diagram showing the light distribution characteristics when the vehicle is upright, FIG. 11 is an explanatory diagram showing the light distribution characteristics when the conventional vehicle is tilted, and FIG. 12 is an explanatory diagram showing the light distribution characteristics when the vehicle is upright and tilted according to the conventional example. FIG. 3 is an explanatory diagram comparing differences in light distribution characteristics. 1, 1A, 1B...reflector, 2...light source, 3A...movable lens, 3B...fixed lens, 4...waterproof lens,
5...Motor, 6...Inclination sensor.

Claims (1)

[Claims] 1. A reflecting mirror that reflects light forward, such as a paraboloid of revolution, a light source placed at or near the focal point of the reflecting mirror, and a light beam provided on the front surface of the reflecting mirror and the light source by using optical means as appropriate. In a motorcycle headlamp device consisting of a lens that obtains light distribution characteristics,
The reflecting mirror is composed of a main reflecting mirror located at the center and an auxiliary reflecting mirror located at the periphery.The main reflecting mirror is opposed to a movable lens that mainly determines light distribution characteristics, and the auxiliary reflecting mirror is A headlamp device for a two-wheeled vehicle, characterized in that a fixed lens that mainly determines center illuminance faces each other, and the movable lens rotates in response to the output of a detector that detects the angle of inclination of the vehicle body.