JPH04119907U - Reflectors for vehicle lights - Google Patents

Abstract

(57) [Summary] [Purpose] The reflective surface is divided into three parts on the left and right, and a paraboloid of revolution is provided at both the left and right ends, and a diffuser curved surface is provided in the center. Eliminate the dark zone directly below. [Structure] The center portion S of the reflector 1' is further divided into three sections in the left and right direction, and a paraboloid of revolution is provided at the most central portions 1c and 1c'. The light emitted from the filament 3f of the light source bulb and reflected by the paraboloids of revolution 1c and 1c' is reflected parallel to the optical axis Z as indicated by arrows c and c', thereby improving the light distribution pattern.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to reflectors for vehicle lights, and in particular to reflectors for vehicle headlights. The present invention relates to a reflector suitable for use as a reflector.

0002

[Conventional technology]

Vehicle lighting generally uses a reflector to direct the luminous flux emitted from the light source bulb. The light is reflected almost horizontally in both directions, and the front lens creates the desired light distribution pattern. The light is dimmed. The light distribution pattern of the vehicle lamp has a bright area (hot spot) in the center of the vehicle traveling direction. It is desirable to have a lighting area that extends from side to side.

0003 Reflectors for lamps work together with the effect of the front lens to achieve the desired light distribution as described above. The reflected light flux of the reflector matches the desired light distribution pattern. It is desirable that it be close to the tone. In response to these requests, the reflective surfaces of the reflector are arranged in the center, left, and right. In addition, both the left and right ends are made into a paraboloid of revolution, and the center part is made into a diffusion curve. A technology has been proposed to make the light a surface area (Utility Application No. 63-39585, vehicle lamp).

0004 FIG. 4 shows an example of an automobile lighting lamp equipped with a reflector 1 according to the above-mentioned known technology. (A) is a horizontal sectional view including the optical axis Z, and (B) is a front view. Both are shown with the front lens removed. As seen in (A) and (B), a valve holder 2 is installed in the center of the reflector 1. A light source bulb 3 is attached at the same place. 3f is the filament and the optical axis Z It is arranged horizontally at right angles to.

[0005] With the exception of areas where a reflective surface cannot be provided by the above-mentioned bulb holder 2, It is divided into three in the direction, and paraboloids of rotation 1b and 1b' are provided at both left and right ends. this Both of the two paraboloids of revolution have their focal points near the filament 3f, and the solution is From a geometrical perspective, it has a shape obtained by cutting off the central portion 1a of a paraboloid of revolution.

[0006] The central portion 1a described above is formed into a diffusion curved surface. As shown in FIG. 4(A), light is emitted from the filament 3f of the light source bulb 3 and rotates. The light flux reflected by the paraboloids 1b and 1b' is parallel to the optical axis Z as shown by arrows b and b'. It becomes a luminous flux. The luminous flux emitted from the filament 3f of the light source bulb 3 and reflected by the diffusion curved surface 1a is , the direction of reflection differs depending on the reflection point. Light a reflected near both ends of the above-mentioned diffusion curved surface 1a₁,a₂diffusion angle θ₁and the expansion Light a reflected near the center of the diabolic surface 1a₂,a₂The diffusion angle of ' is θ₂and θ₁＜θ ₂ It is. In other words, the structure is such that the farther inside the reflection point is, the larger the diffusion angle becomes. .

When the headlamp of this known example is installed so that the optical axis Z thereof is horizontal and a screen provided in front of the lamp is illuminated, the result is as shown in FIG. 5(A). In the figure, H is a horizontal line on the screen, and V is a vertical line. The aforementioned parallel light beams b and b' irradiate the front surface to create a hot zone 4b. The reason why the hot zone 4b is long in the left and right directions is that the filament 3f lies horizontally, as shown in FIG. The diffused light beams a ₁ , a ₁ ', a ₂ , a ₂ ' in the left and right directions shown in FIG. 4 create an illumination zone extending left and right as shown at 4a in FIG. 5(A).

[0008] The light distribution pattern shown in Fig. 5(A) has little diffusion in the vertical direction and (for example, about 30 degrees), and a hot zone 4b is formed in the center. The characteristics approximate the desired characteristics of vehicle lighting (e.g. fog lamps). This is convenient.

[0009]

[Problem that the idea aims to solve]

As mentioned above, the light distribution pattern of the reflected light by the conventional reflector shown in FIG. 5(A) The light distribution characteristics approximate the desired light distribution characteristics of vehicle lighting (e.g. fog lamps). ,incomplete. In particular, as shown with spots in Figure 5(B), the center of the illuminated area A dark area D appears directly above and below.

0010 In the prior art, the hot zone 4b is diffused by a front lens, and the hot zone 4b is diffused by a front lens. Finally, a desired light distribution pattern is achieved.

[0011] The present invention has been made in view of the above-mentioned circumstances, and is based on the reflector of the above-mentioned known example. (Figure 4) was further improved to eliminate the dark zone D shown with spots in Figure 5 (B). The porpose is to do. If this dark zone D is eliminated, it will depend on the purpose of use of the lamp. It is also possible to use a clear lens as the front lens.

0012

[Means to solve the problem]

The reflector for a vehicle lamp according to the present invention has a structure to achieve the above object. A bulb holder is installed near the center of the reflective surface and the light source bulb is attached. The reflective surface is divided horizontally, and the left and right ends of the divided reflective surface are connected to the light source bulb. A paraboloid of revolution with a focal point near the filament of the beam, and a divided reflective surface. The center part is a diffusion curve that diffuses the light flux incident from the light source bulb in the left and right direction. By improving the reflector of vehicle lights that have a surface, The above divided reflective surface is further divided in the left and right direction, and a parabola of revolution is placed in the centermost part. In addition to forming a surface, a diffusion curved surface similar to the above is provided in the intermediate portion other than the most central portion. It is characterized by a large number of characters.

[0013]

[Effect]

In the conventional reflector shown in FIG. 4, paraboloids of revolution 1b, 1 at both left and right ends The parallel light beam reflected at b' (arrows b, b') moves left and right on the screen shown in Figure 5. Create a long hot zone 4b. This hot zone 4b is a paraboloid of rotation of the reflector. It can be seen that the reflected light from the surface forms an optical image of the filament 3f (see Figure 4(A)). I can do that. Now, if we apply the above-mentioned means to a conventional reflector, ), a paraboloid of revolution is formed at part C shown surrounded by an imaginary line, and the reflected light parallel to the optical axis Z is reflected. Considering the case where this virtual reflected light is formed, this virtual reflected light will correspond to the light distribution pattern shown in Fig. It overlaps with hot zone 4b. However, compared to the reflection point of the reflected lights b and b' that formed the hot zone 4b in the conventional example, The virtual reflective surface C is close to the light source. Therefore, it is reflected by the virtual reflecting surface C above. The virtual reflected light almost overlaps with the hot zone 4b on the light distribution pattern chart of FIG. Moreover, it is wider than the hot zone 4b. In this way, by the means mentioned above, The reflected light from the paraboloid of rotation created at the centermost part of the To solve the drawbacks of the known examples by covering the curve D.

[0014]

【Example】

FIG. 2 shows one embodiment of a reflector for a vehicle lamp according to the present invention, and FIG. A horizontal cross-sectional view including the optical axis Z, and FIG. 3B is a front view as well. This embodiment is an improvement of the above-mentioned known example (Fig. 4) by applying the present invention. , those with the same drawing reference numbers as those in FIG. They are similar components. Figure 1 shows the same embodiment as Figure 2 above, and Figure 2 is for convenience in understanding the structure. It is a schematic drawing. Next, we will explain this implementation with reference to Figures 1 and 2. Ru.

[0015] The differences of this embodiment from the above-mentioned known example are as follows. That is, The reflector 1' is divided into left and right directions, and paraboloids of revolution 1b and 1b' are provided on both sides. , occupied by these paraboloids of rotation 1b, 1b' and the valve holder 3. The remaining part of the area (see S in Figure 1 (B)) is further divided into thirds in the left and right direction, and the most A paraboloid of revolution is formed in the central portions 1c and 1c'. These paraboloids of revolution 1c and 1c' are mutually the same paraboloid of revolution in analytical geometry. Furthermore, the paraboloids of revolution 1b and 1b' at both ends are the same paraboloid of revolution. In other words, the paraboloid of revolution that shares the focal point with the optical axis Z is moved left and right by the diffusion curved surface. It has a shape in which the valve holder 3 is cut into upper and lower parts.

When the optical path of this embodiment shown in FIGS. 1(A) and 2(A) is compared with the optical path of FIG. 4(A) depicting the known example, arrows b, b', arrow a ₁ , a ₁ ′, and a ₂ , a ₂ ′ are the same or similar, but in this example, the parallel light beam c reflected parallel to the optical axis Z by the central paraboloid of revolution 1c, 1c′ , c' are occurring. The light beams indicated by arrows c and c' illuminate the front of the lamp of this embodiment. FIG. 3 is a diagram of the light distribution pattern. A comparison of this light distribution pattern with a known example (FIG. 5(A)) is as follows. The hot zone 4b formed by the reflected light of arrows b and b' is the same as in FIGS. 3 and 5(A). The shape of the illumination zone 4a formed by the reflected light of arrows a ₁ , a ₁ ′, a ₂ , and a _{2 ′} is the same in both figures. Furthermore, in this embodiment (FIG. 3), an auxiliary hot zone 4c is formed near the center of the illumination area by the reflected lights of the arrows c and c'.

[0017] The actual lighting condition will be a combination of the above three patterns 4a, 4b, and 4c. . In this way, the dark zone D (FIG. 5(B)) that existed in the above-mentioned known example is removed. The light distribution pattern is almost as desired due to the reflected light from the reflector. It will be done.

[0018] Due to the above effects, even if the standards for light distribution characteristics are strict, the front lens will not be able to control light. To reduce the burden, and when the standards for light distribution characteristics are not strict, the front lens can be made transparent. It is also possible to

[0019]

[Effect of the idea]

A bulb holder is installed near the center of the reflective surface and the light source bulb is attached. dividing the reflective surface into left and right directions; The left and right ends of the divided reflective surfaces are focused near the filament of the light source bulb. Let be a paraboloid of revolution located at The center part of the divided reflective surface directs the light flux incident from the light source bulb in the left and right direction. By applying the present invention to a reflector for a vehicle lamp that has a diffusion curved surface that causes diffusion, The above divided reflective surface is further divided in the left and right direction, and a parabola of revolution is placed in the centermost part. In addition to forming a surface, a diffusion curved surface similar to the above is provided in the intermediate portion other than the most central portion. When you start, The dark zones directly above and below the center of the illumination area are illuminated, and the light reflected by the reflector is distributed. Before the pattern is dimmed by the lens, it almost has the desired light distribution characteristics. As a result, the riff Significantly reduces the burden of light control on the front lens of the lamp due to the luminous flux reflected by the reflector. Depending on the conditions of use, it is also possible to omit the front lens.

[Brief explanation of drawings]

[Fig. 1] Schematic two-view diagram showing one embodiment of the present invention

[Fig. 2] Two side views showing one embodiment of the present invention

[Figure 3] Light distribution pattern chart in the above example

[Fig. 4] Two-view diagram for explaining a conventional reflector

[Figure 5] Light distribution pattern chart in the above conventional example

[Explanation of symbols]

1, 1' Reflector 1a, 1a' Diffusion curved surface 1b, 1b' Paraboloid of revolution 1c, 1c' Paraboloid of revolution 2 Bulb holder 3 Light source bulb 3f Filament 4a Illumination zone 4b Hot zone 4c Auxiliary hot zone a ₁ , a ₁ ', a ₂ , a ₂ ' Optical path b, b' of the reflected light by the diffuse curved surface Optical path c, c' of the reflected light by the paraboloid of revolution H Optical path H of the reflected light by the paraboloid of revolution at the center Horizontal line S on the screen Center part of reflector V Vertical line on screen θ ₁ , θ ₂ Diffusion angle

Claims (1)

[Scope of utility model registration request] 1. A bulb holder is provided near the center of the reflective surface to mount the light source bulb, and the reflective surface is divided into left and right directions, and the left and right ends of the divided reflective surface are attached to the light source bulb. This is an improved reflector for a vehicle lamp, in which the reflector is a paraboloid of revolution with a focal point located near the filament, and the central part of the divided reflecting surface is a diffusion curved surface that diffuses the luminous flux incident from the light source bulb in the horizontal direction. Then, the divided reflective surface is further divided in the left and right direction, and a paraboloid of revolution is formed at the most central part thereof, and a diffusion curved surface similar to the above is provided at an intermediate part other than the most central part. A reflector for a vehicle lamp characterized by: