JPS635127Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automobile lamp in which an outer lens and an inner lens are arranged side by side.

In this type of automotive lamp, a Fresnel lens is formed on the inner lens to convert the light from the bulb into parallel rays, and the parallel rays are focused by a condensing lens formed on the outer lens to obtain a constant light distribution. However, due to the accuracy of the Fresnel lens, there is a restriction that the bulb must be installed at the center of the Fresnel lens of the inner lens.

However, as shown in FIGS. 4 and 5, depending on the layout of the vehicle body A, there may be cases where the bulb 1 cannot be installed at the center of the lamp chamber B.

In such a case, conventionally the center position of the Fresnel lens 2' of the inner lens 2 was set at a position other than the center of the lamp chamber B depending on the installation position of the bulb 1, that is, on the optical axis of the bulb. When viewed from the front, the Fresnel lens 2' of the inner lens 2
Since the center position becomes extremely bright, the brightest part occurs at a location away from the center of the lens, resulting in poor brightness balance, resulting in a very poor appearance when lit, and poor light distribution performance.

In view of these drawbacks of conventional lamps, the present invention forms a concentric refractive Fresnel lens at the center of the inner lens facing the outer lens side, and uses the above refractive Fresnel lens on the inner lens facing the bulb side. By forming a correction lens to derive parallel rays from the light source and a concentric reflective Fresnel lens centered on the optical axis of the bulb on the outside of the correction lens, the light fixture can be viewed from the front regardless of the installation position of the bulb. It is an object of the present invention to provide a lighting device for an automobile which has a good brightness balance when viewed from above, has a good appearance when turned on, and has good light distribution performance.

An example of implementing the present invention will be described below based on the drawings.

In the figure, 1 is a bulb, which is installed at a position other than the center of the light chamber B (in the illustrated example, above the center of the light chamber B),
An inner lens 2 and an outer lens 3 are arranged in parallel on the front surface of a bulb 1.

The inner lens 2 has a refractive Fresnel lens 2a formed on the surface facing the outer lens 3, and a correction lens 2b and a reflective Fresnel lens 2c for guiding parallel rays from the refractive Fresnel lens 2a on the surface facing the bulb 1. It will be done.

The refractive Fresnel lens 2a is the outer lens 3
They are formed concentrically around the center P position of the inner lens 2 on the side facing . inner lens 2
The center P is the position that coincides with the center of the lamp chamber B when the lamp is viewed from the front.

The correction lens 2b is for inputting the light A from the bulb 1 and guiding the parallel light ray A' from the refractive Fresnel lens 2a. It is formed to have the same width L as the refractive Fresnel lens 2a.

The reflective Fresnel lens 2c is formed concentrically around the optical axis Q of the bulb 1 outside the correction lens 2b of the inner lens 2 facing the bulb 1 side.

In addition, the reflective Fresnel lens 2 is further away from the bulb 1.
Since the light beam incident on c may not be completely parallelized, in that case, a correction lens 4 is formed on the side facing the outer lens 3.

The outer lens 3 has a condensing lens 3a formed on the side facing the inner lens 2, as in the conventional case.

In the present invention, the bulb 1 is installed in a position other than the center P of the light chamber B due to the layout of the vehicle body A, and the outer lens 3 and the inner lens 2 are arranged side by side in front of the light chamber B. In this automotive lamp, a concentric refractive Fresnel lens 2a is formed at the center P position of the inner lens 2 facing the outer lens 3 side, and the refractive Fresnel lens 2a is formed on the inner lens 2 facing the bulb 1 side. A correction lens 2b is formed for deriving parallel rays from the lens, and a concentric reflective Fresnel lens 2c centered on the optical axis Q of the bulb 1 is formed outside the correction lens 2b, so that it is a refractive Fresnel lens. Even if the center P position of the lens 2a and the optical axis Q position of the bulb 1 are shifted from each other, the refractive Fresnel lens 2
The light that has passed through a and the reflective Fresnel lens 2c becomes parallel rays A' and B' and is equally incident on the entire outer lens 3. Therefore, light distribution performance is improved, and at the same time, when looking at the lamp from the front, the brightness is well balanced regardless of the position of the bulb.
The appearance when lit is improved.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

1 to 3 show an example of the implementation of the present invention,
1 is a front view, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is an enlarged sectional view of the inner lens. Figure 4 is a front view showing a conventional example, and Figure 5 is a front view of a conventional example.
It is a sectional view taken along line 5-5 in the figure. In the figure, 1 is a bulb, 2 is an inner lens, 2a
is a refractive Fresnel lens, 2b is a correction lens, 2
c is a reflective Fresnel lens, 3 is an outer lens, A is a vehicle body, B is a lamp chamber, P is the center of the inner lens, and Q is the center of the bulb.

Claims (1)

[Scope of utility model registration request] In an automobile lamp in which a bulb is installed at a position other than the center of the light chamber, and an outer lens and an inner lens are arranged side by side on the front of the light chamber, a concentric refraction is formed at the center position of the inner lens facing the outer lens side. A correction lens for guiding parallel rays from the refractive Fresnel lens is formed on the inner lens facing the bulb side, and a concentric circle centered on the optical axis of the bulb is formed on the outside of the correction lens. An automotive lamp characterized by forming a reflective Fresnel lens.