JPS5810241Y2 - Vehicle lights - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lighting device such as a side lamp or a tail lamp that is attached to a vehicle.

Generally, this type of lamp has a lens attached to the front side to increase the illuminance, but also a relatively deep reflecting mirror with a hemispherical or parabolic surface attached to the back side of the light source. ing.

However, there is limited space for mounting on the side or rear of the vehicle body, and it becomes difficult to secure space for mounting, especially if the lamp is long in depth.

In addition, if you try to reduce the depth of the lamp in consideration of space, or if you use a dish-shaped reflecting mirror with a large degree of curve, the reflected light will be diffused, making it difficult to extract parallel light rays, and the illuminance of the lamp will decrease.

This invention was created in view of these circumstances,
The purpose is to provide a vehicular lamp that can extract parallel light even if it is shallow in depth and flat, and does not cause a decrease in illuminance.

The present invention, which was developed to achieve this purpose, consists of a refractive prism system and a reflective prism system that convert the incident light from the light source into parallel rays.A plane lens has a Fresnel cut on one surface, and aluminum sputtering is applied on the other surface. , a vehicle lamp characterized in that the flat lens is provided on the back side of the light source with the Fresnel cut surface facing the light source side, the flat lens having a Fresnel cut is provided on the back side of the light source. Since the aluminum sputter reflects the incident light in the same direction, all reflected light returns to the light source and is irradiated through the light source, so consider converting the light from the light source into parallel rays. This makes it possible to form a lamp with a simple structure and an extremely shallow depth.

Next, the present invention will be explained in more detail with reference to the illustrated embodiment. In the first embodiment shown in FIG. Attached to the sides are an inner lens 3 and an outer lens 4, each having a Fresnel cut that converts the light from the light source into parallel rays.

The lamp housing is generally flat and has a flat back wall 5.

On the inside of the back wall 5, there is a flat lens 8, which has a Fresnel cut 6 on one surface that converts light from a light source into parallel rays, similar to the inner lens, and has an aluminum sputter 7 on the other non-cut surface. Place.

For this arrangement, face the Fresnel cut surface toward the light source 2 side,
It can be mounted with the aluminum sputtered surface facing the rear wall 5.

As shown in FIGS. 2 and 3, the Fresnel cut 6 has a gentle slope near the center in its cross section, and becomes steeper and taller as it gets farther away.

Then, the light source a from the light source 2 is surrounded by parallel light beams, which are reflected by the surface of the aluminum sputter 7 and returned to the light source 2 following exactly the same path as the incident light beam a.

The Fresnel cut shown in FIG. 2 is a known refractive prism-based Fresnel cut, and the Fresnel cut shown in FIG. 3 is a known reflective prism-based Fresnel cut.

In the second embodiment shown in FIG. 4, the back wall 5' of the lamp housing 1' is used as it is as a plane lens 8', and a Fresnel cut 6' is made on the inside of the back wall.
Aluminum sputter 7' is applied to the outside.

Even if formed in this manner, a lamp having exactly the same effect as the first embodiment can be obtained.

In the lamp of the present invention having the above configuration, direct light emitted from the light source 2 to the front side is turned into parallel light by the inner lens 3 and projected to the outside via the outer lens 4.

The light ray a irradiated from the light source 2 to the back side is reflected by the Fresnel cut 6 of the plane lens 8 and the aluminum sputter 7 following the same path as the irradiated light ray a, and the reflected light passes through the light source to the aforementioned front side. It is superimposed on the direct light of the light and is irradiated with the same amount of light, and is projected to the outside with twice the brightness.

Therefore, even if the entire lamp is a so-called flat type with an extremely shallow depth compared to the front illumination surface, all the light emitted to the back side will be reflected back to the light source, so in effect it will be a hemispherical reflector. This means that the illumination light will be the same as when used, and the illuminance will not decrease.

As explained above, the vehicle lamp according to the present invention (by providing a flat lens with Fresnel cut and aluminum sputtering on the back side of the light input source, the overall depth of the lamp is shallow, making it compact and flat. The limited and narrow mounting on the side or back of the vehicle makes it easy to install in a space and has the excellent effect of not reducing illuminance.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal side view showing the first embodiment of the lamp according to the present invention, Fig. 2 is an enlarged view of the part indicated by ■ in Fig. 1, and Fig. 3 is shown by the eyes in Fig. 1. Figure 4 is an enlarged view of the part shown in Figure 2.
FIG. 2 is a partially longitudinal side view showing an example. 1.1'...Lamp housing, 2...
・Light source, 3... Inner lens, 4...
・Outer lens, 5.5'... Rear wall, 6,
6'... Fresnel cut, 7.7'...
・Aluminum sputter, 8,8'...Flat lens.

Claims (1)

[Scope of utility model registration request] Refractive prism system and reflective prism system that converts incident light from a light source into parallel rays A plane lens with a Fresnel cut on one side is sputtered with aluminum on the other side, and the plane lens is oriented so that the Fresnel cut side faces the light source side. A vehicle lamp characterized in that the light source is provided on the rear side of the light source.