JPS5810302U - Lens for vehicle lights - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main part of an example of a conventional lens for a vehicle lamp taken along a plane that includes the optical axis, and Figure 2 is a sectional view of the inner lens of the lens shown in Figure 1 from the optical axis to the periphery. Brightness distribution diagram showing the brightness of each point on the lens surface up to
The figure is a sectional view of the main part of an example of a lens to which the present invention is applied, cut along a plane including the optical axis, and Fig. 4 is a plan view of the main part of the lens shown in Fig. 3, viewed from the light source side. FIG. 5 is an enlarged sectional view showing the vicinity of the boundary between the refractive prism step and the reflective prism step of the lens shown in FIG. 3, and FIG. 6 is the same part as FIG. 5 of the conventional lens. Figure 7 is a cross-sectional view for explaining the focal position when the light transmitted through the refractive prism step is parallel to the optical axis, and Figure 8 is the refractive prism step. Fig. 9 is a cross-sectional view to explain the focal position when the light passing through the prism step forms a certain angle to the optical axis, and Fig. Graph showing the relationship with the amount of light arriving, 1st
Figure 0 is a cross-sectional view showing an example of a lens that forms a fisheye step with a constant pitch and a varying radius of curvature, and Figure 11 shows that in diffusion steps with the same radius of curvature, the diffusion angle changes depending on the size of the pitch. FIG. 12, which is an analytical diagram for explanation, is a graph showing the luminance distribution of the lens shown in FIG. 3 in comparison with a conventional one. Explanation of symbols, 2... Refraction system prism step,
4...Reflection prism step, 5...
・Diffusion stelaph, 6... Refraction system prism step entrance surface, 7... Step reference plane, i□...
...Incidence angle to the incident surface of the refractive prism step, β
・・・・・・Deflection angle of the reference plane of the diffusion step.

Claims (1)

[Scope of utility model registration request] There is a refractive prism step in the center of the lens facing the light source, and a reflective prism step around it.
A diffusion step is formed on the side of the lens from which the light exits, and at least the one that borders the reflection prism step and the one that is close to it among the refractive prism steps have their incident surfaces there. The incident light is deflected in the direction of the light source so that the angle of incidence is as small as possible, and each diffusion step where the light that has passed through the refractive prism step deflected in this way is transmitted and exits. A vehicle lighting lens characterized in that its reference plane is deflected outward by a required angle.