JPS6139681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel vehicle headlamp lens.
Specifically, the present invention provides a lens for a vehicle headlight in which an upper portion and/or a lower portion of an intermediate portion in the vertical direction is bent rearward, in which upwardly scattered light, etc. from the bent portion is bent. The purpose is to prevent harmful light from being emitted.

For design reasons, for example, matching the shape line of the front of the headlight to the outline line of the front of the car body, etc.
Alternatively, for technical reasons, vehicle headlights are sometimes used in which the upper and/or lower parts of the vertical middle part of the lens are bent rearward. . 1 to 3 show examples of such vehicle headlights. This vehicle headlight a includes a reflecting mirror b having a substantially horizontally long rectangular opening, and a lens c having a substantially horizontally long rectangular front surface covering the front surface of the reflecting mirror b having a substantially horizontally long rectangular opening. The upper portion e of the lens c is bent rearward at an intermediate portion d in the vertical direction. The vehicle headlight lens has various lens elements formed on its inner surface to control the light from the light source and obtain the desired light distribution, but only the basic thickness is shown in the drawing. Therefore, illustration of the lens element is omitted. As mentioned above, when the upper part e of the lens c is tilted backward, harmful light such as upwardly scattered light that glares at oncoming drivers and pedestrians is emitted at the bent part d. This will impair traffic safety.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a novel vehicle headlight lens that prevents the emission of light harmful to traffic safety, such as upwardly scattered light, even when the lens has a bent portion. The upper part and/or the lower part of the intermediate part is bent toward the rear, and the basic thickness of the part above the bent part becomes thinner as it goes upward. It is characterized by

The details of the vehicle headlight lens of the present invention will be explained below with reference to the illustrated embodiments.

FIG. 4 shows an example 1 of the vehicle headlight lens of the present invention. This lens 1 is bent so that an upper portion 2 from the middle portion in the vertical direction is inclined rearward. And lens 1
Inflection point 3 on the outer surface and inflection point 4 on the inner surface of
are shifted so that the bending point 4 is slightly higher. Furthermore, the upper portion 2 of this lens 1 is formed such that its basic thickness becomes thinner as it goes upwards at a suitable angle θ.

In such a lens 1, it is as if a downward refracting prism 5 is formed within the lens thickness at the bent portion of the lens 1, so that light directed toward this bent portion is controlled to be refracted downward. . Therefore, there is no possibility that upward scattered light is emitted from the bent portion, unlike the conventional lens c. Furthermore, since the basic thickness of this part is formed so that it becomes thinner as it goes upward, the light incident on the upper part 2 of the lens 1 is refracted downward. There is no possibility that the backward scattered light will be emitted. Furthermore, as shown in the figure, if the bending point 4 on the inner surface is shifted upward by a distance 6 from the bending point 3 on the outer surface, then during this period 6
The prism effect becomes more pronounced, and the effect of blocking upward scattered light becomes greater.

As mentioned above, a vehicle headlight lens usually has a lens element formed on its inner surface, but in order to make the explanation easier to understand, only the basic thickness is shown in the drawings. This also applies to the embodiment shown in FIG. 5 below.

In addition, in the above explanation, the inner and outer bending points 4 and 3 are shown as points, but this is also for the convenience of explanation, and it is not necessarily necessary to express them as clear bending points. Due to problems in mold forming, etc., points are usually marked with an appropriate radius (R) of large or small, and even in such cases, bending points 3 and 4 as described above conceptually exist. It is possible. The problem regarding such bending points also applies to the embodiment shown in FIG. 5 below.

FIG. 5 shows another embodiment 7 of the vehicle headlight lens of the present invention. This lens 7 is also bent so that the upper part 8 from the middle part in the vertical direction is inclined rearward, and the bending point 9 on the outer surface of the lens 7 and the bending point 10 on the inner surface are different from each other. is shifted so that it is slightly higher. Furthermore, in this lens 7, a point 11 slightly above the bending point 10 on the inner surface
up to the front is slanted towards the front. Further, the upper portion 8 of this lens 7 is also formed so that its basic thickness becomes thinner as it goes upward.

In this embodiment as well, the bent portion is substantially formed with an upwardly directed refracting prism, and furthermore, the basic thickness of the upper portion 8 becomes thinner as it goes upward. Therefore, the function is substantially the same as that of an upwardly directed refracting prism, thereby eliminating the problem of upwardly scattered light being emitted as in the prior art.

As described above, in the vehicle headlight lens of the present invention, even if the upper part and/or the lower part of the vertically intermediate part is bent rearward, the bent part Since the basic thickness of the upper portion becomes thinner as it goes upward, no harmful light such as upward scattered light is emitted from the bent portion.

Incidentally, in each of the above embodiments, a vehicle headlight lens in which the upper portion is inclined toward the rear is mentioned, but the lens is not limited to such a lens.
The present invention can also be applied to a vehicle in which only the lower portion is tilted rearward, or to a vehicle in which both the upper and lower portions are tilted rearward.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional vehicle headlight lens. Figure 1 is an overall perspective view, Figure 2 is a longitudinal cross-sectional end view, and Figure 3 is a section d in Figure 2. The enlarged view, FIG. 4, and FIG. 5 are sectional views of essential parts showing different embodiments of the vehicle headlight lens of the present invention, respectively. Explanation of symbols: 1...Lens, 2...Upper part, 7...Lens, 8...Upper part.

Claims (1)

[Claims] 1 At the middle part in the vertical direction, the upper part and/or the lower part are bent toward the rear, and the basic thickness of the part above the bent part becomes thinner as it goes upward. A lens for a vehicle headlight, which is characterized by being made to look like this.