JPH031844Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention relates to warning lights installed at railroad crossings. ) is used as a light source.

〓Conventional technology〓 Conventionally, this type of LED railroad crossing light 21, as shown in Fig. 4, has a surface-emitting shape by closely arranging a plurality of LED light sources 22 as light sources, and uses a light bulb. This is similar to the reflected light from the reflecting mirror of the same type of lamp, and as a result, the front lens 23 is often made with a conventional lens cut.
If the arrangement pitch of this lens cut and the LED light source 22 is different, local light unevenness may be felt when viewing the front lens 23, so some lenses have the pitches matched.

=Problems to be solved by the invention- However, the LED railway crossing light 21 of the conventional structure described above has the above-mentioned LED light source 22.
has an irradiation angle of approximately 15 degrees, which is different from the parallel light rays produced by a reflecting mirror.For this reason, with the conventional front lens 23, light is directed to the center of the lamp 21 as shown by the light distribution characteristic HO in Fig. 5. This causes problems in that the light is concentrated, giving the viewer a sense of uneven light distribution, and that visibility from an oblique direction is poor.

〓Means for solving the problems〓 As a specific means for solving the above-mentioned conventional problems, the present invention provides a plurality of lenses on the back of the front lens.
An LED light source is disposed on the front lens.
In an LED railroad crossing light comprising a fisheye-shaped lens cut facing an LED light source, the front lens is divided into a plurality of concentric sections,
An auxiliary cut is provided at a position corresponding to the central illumination angle of the LED light source of each of the fish-eye lens cuts, and the correction inclination angle increases from the center of each of the sections toward the outer periphery, and By providing an LED railway crossing light characterized in that the corrected inclination angle is provided with an overlap at the boundary between the sections, the above-mentioned conventional problems are solved by preventing uneven light distribution. It is something.

〓Example〓 Next, the present invention will be explained in detail based on an example shown in the drawings.

What is shown in FIG. 1 is the main part of an LED railway crossing light 1 (hereinafter abbreviated as the light 1) according to the present invention, and what is indicated by reference numeral 2 in the figure is an LED light source. A plurality of LED light sources 2 are disposed on a substrate 3. At the same time, a front lens 4 facing each LED light source 2 is provided with a lens cut 4a having, for example, a convex spherical surface. The entire surface of 4 is shaped like a fisheye lens.

Here, to explain the LED light source 2 in more detail, the LED light source 2 is an LED light source.
The chip 2a is molded with a resin case 2b having a lens-shaped top part 2c, and by adopting this shape, the light is focused by the top part 2c, and approximately
A bright central irradiation angle part C with a 15° irradiation angle,
A peripheral illumination angle portion O is formed at the periphery thereof.

According to the present invention, an auxiliary cut 4b having a corrected inclination angle α is further provided at a position corresponding to the central illumination angle portion C of the lens cut 4a. For example, this auxiliary cut 4b corrects the optical axis of the convex spherical surface by adjusting the inclination angle α.
By tilting the LED light source 2 by a certain amount, an appropriate deflection angle is given to the light intensity of the central illumination angle portion C of the LED light source 2, that is, substantially the majority of the LED light source 2. Specifically, the center portion is brighter. By directing the amount of light of the lamp 1, which tends to become irradiated, toward the periphery by the auxiliary cut 4b, uniform illuminance over the entire surface of the lamp 1 can be realized.

What is shown in FIG. 2 is the auxiliary cut 4 for realizing uniform illuminance over the entire surface of the lamp 1.
This shows a preferred embodiment of b, in which the lamp 1 is divided concentrically into three sections 1A, 1B, and 1C in terms of design, and in the section 1A, the lamps are gradually increased from the center toward the outer periphery. An auxiliary cut 4b having a corrected inclination angle α ranging from 0° to 8° is made, and the section 1
An auxiliary cut 4b having a corrected inclination angle α ranging from 5° to 13° is applied to the section 1B adjacent to the section A, and similarly, an auxiliary cut 4b having a corrected inclination angle α ranging from 10° to 20° is applied to the section 1C adjacent to the section 1B. An auxiliary cut 4b is made. Particularly noted here is that an overlap of the corrected inclination angle α is provided at the boundary between section 1A and section 1B, and between section 1B and section 1C, respectively. As a result of the prototype study conducted by the inventor, by providing the above-mentioned overlap, the light distribution characteristic HA of section 1A can be adjusted to the third level.
Figure A shows the light distribution characteristics HB of section 1B in Figure 3B.
Similarly, the orientation characteristics HC of section 1C are as shown in FIG. 3C, and the respective light distribution characteristics HA, HB, HC
becomes extremely gentle, and the orientation characteristic HT of the lamp 1, which is its overall characteristic, also has a lower illuminance compared to, for example, when the corrected inclination angle α is uniformly increased from the center to the outermost periphery of the lamp 1. It was found that a uniform product with little unevenness could be obtained.

Now, to explain the effect of providing the auxiliary cut 4b only in the central irradiation angle portion C of the LED light source 2, by doing so, the auxiliary cut 4b has a small diameter,
In addition, it essentially biases the light intensity of most of the LED light source 2 in the desired direction, making the lens 4 much thinner than, for example, when the entire lens cut 4a is operated for the same purpose. It is possible.

For ease of understanding, the explanation was given assuming that the corrected inclination angle α is the same in the circumferential direction, but depending on the installation location of this type of lamp 1, for example, an illumination angle may not be necessary in the upward direction. An asymmetric viewing angle is often required, and in this case as well, it can be implemented based on the same principle and can be freely modified.

Effects of the invention As explained above, according to the invention, the front lens is divided into a plurality of concentric sections in the fisheye-shaped lens cut that is provided on the front lens facing the LED light source. An auxiliary cut whose correction angle of inclination increases from the center to the outer periphery of each of the sections is provided at a position corresponding to the center illumination corner of each of the LED light sources of the fisheye lens cut, and By making the lamp have an overlap in the corrected inclination angle at the boundary between the two, most of the light amount from the LED light source can be biased in the desired direction by this auxiliary cut, and the lamp can be made thinner. It is possible to realize flat illuminance characteristics with the full-surface lens, and it has the excellent effect of providing an LED railroad crossing light that does not give viewers a sense of uneven illuminance and has a wide viewing angle and excellent visibility. .

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of the main parts of an embodiment of the LED railway crossing light according to the present invention, Fig. 2 is a front view of the same, and Fig. 3 is a graph showing the light distribution characteristics of this embodiment. , FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a sectional view showing a conventional example.
The figure is a graph showing light distribution characteristics of a conventional example. 1...LED railway crossing light, 2...LED light source,
3... Substrate, 4... Lens, 4a... Lens cut, 4b... Auxiliary cut, C... Center irradiation corner,
α……Corrected inclination angle.

Claims (1)

[Scope of utility model registration request] In an LED railroad crossing light, in which a plurality of LED light sources are disposed on the back of a front lens, and a fisheye-shaped lens cut facing the LED light sources is provided on the front lens, the front lens has a plurality of concentric An auxiliary cut that is divided into sections and is arranged at a position corresponding to the central illumination angle of the LED light source of each of the fisheye-shaped lens cuts, the correction inclination angle of which increases from the center of each section toward the outer periphery. An LED railroad crossing light, characterized in that the corrected inclination angle is overlapped at the boundary between the sections.