JPH1021710A - Lighting fixture for signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of color unevenness on a front lens surface by arranging a small number of LEDs at wider intervals when the number of two kinds of LEDs is different in a signal lighting fixture using as a light source the conventional two kinds of LEDs having different light emitting colors. SOLUTION: In a lighting fixture 1, an LED 4a having one emitting color is arranged on the back surface of a front lens 5, and an LED 4b having the other emitting color is arranged so as to face the thickness surface of the front lens 5, light is propagated within the front lens 5, light of the other emitting color is emitted in the radiation direction by a plurality of reflecting cuts 5a formed on the inner surface of the front lens 5 to be mixed with the one emitting color. The other emitting color propagated within the front lens 5 is uniformly radiated with reflecting cuts 5b from the whole surface of the front lens 5, and the generation of color unevenness is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, traffic signals,
More specifically, the present invention relates to a signal lamp used for a railway signal or the like. Specifically, two types of LEDs having different emission colors are used as a light source, and the two types of emission colors are mixed at an appropriate ratio to form a specified color. The present invention relates to a signal lamp for obtaining irradiation light.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of the structure of a conventional signal lamp 90 of this type. A disk-shaped board 92 is provided in a housing 91 of the signal lamp 90. FIG.
A plurality of LEDs 93 are concentrically arranged and mounted on the substrate 92, and a front lens 94 is provided on the front.
It is supposed to be covered with.

At this time, an LED 93 of one kind of emission color is used.
Is adopted as a light source, for example, an incandescent light bulb (25
In some cases, the luminous color and the chromaticity of a conventional lamp having a light source of (00 to 2800 ° K) do not match. In this case, as shown in FIG. L
An ED 93a and an LED 93b of another emission color are arranged on the substrate 92 at an appropriate ratio, and a desired emission color is obtained by mixing two colors.

[0004]

However, in the signal lamp 90 having the above-mentioned conventional configuration, the LED 93a of one emission color is replaced by the LED 9a of the other emission color.
If the number of 3b is small, the LED of the other emission color
The arrangement of 93b must be performed at intervals.

When the signal lamp 90 is turned on in this state, the LED 9 of the other one of the luminescent colors is displayed on the front lens 94 surface.
3b, a portion R through which only light from the LED 93a of one emission color is transmitted is provided on the surface of the front lens 94, as shown in FIG.
A problem arises in that a portion RG through which the light from the light source 93a and the LED 93b of the other one of the colors transmit is generated, which causes a distinct color unevenness, and impairs the quality of the signal lamp 90. And the solution of this point has been an issue.

[0006]

According to the present invention, as a specific means for solving the above-mentioned conventional problems, a light source in which two kinds of LEDs having different emission colors are mixed at a predetermined ratio, In a signal lighting device configured to obtain irradiation light of a specified color by mixing colors of light emitted from the two types of LEDs, one of the LEDs having one light emission color is arranged on the back surface of a front lens and transmitted through the front lens. And the other one of the LEDs emits light of another emission color, and the other LED emits light of another emission color in the front lens. And a plurality of reflection cuts provided on the inner surface side of the front lens to emit light of the other one emission color in the irradiation direction side, thereby performing a color mixture with the one emission color. Providing signal lamps characterized by In Rukoto, as no color unevenness on the front lens surface at the time of lighting, it is intended to solve the problem.

[0007]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and FIG.
The signal lamp according to the present invention is provided with a substrate 3 in a housing 2 of the signal lamp 1. On the substrate 3, two types having different emission colors such as red and green are provided. LEDs 4a and 4b are mounted, and the front surface thereof is covered with a front lens 5 as in the conventional example.

Here, in the present invention, one of the two types of LEDs 4a and 4b, which is the most used one, is used as the back surface of the front lens 5 as in the conventional example. For example, it is arranged concentrically on 3, and a light introducing portion 5 a is provided over the entire circumference on the plate thickness surface of the outer edge portion of the front lens 5, and is used in a smaller number to face the light introducing portion 5 a. LED of one other emission color
4b is arranged.

Therefore, most of the front lens 5 of this type of signal lamp 1 has a circular shape when viewed from the front, and the LED 4b of the other luminescent color is shown in FIG. As shown, L of one emission color arranged concentrically
The same concentric circles are arranged outside the ED 4a.

On the back side of the front lens 5, that is, on the inner side, a plurality of reflection cuts 5b having, for example, a conical or quadrangular pyramid-shaped recess are provided as shown in a partially enlarged view in FIG. For example, a uniform pitch P in the vertical and horizontal directions is provided over the entire effective portion of the front lens 5 (see FIG. 1).

Next, the operation and effects of the signal lamp 1 of the present invention having the above-described configuration will be described. First, one emission color LED disposed on the back side of the front lens 5
The light radiated from 4a passes through the front lens 5 as it is and is radiated to the outside from the front surface 5c of the front lens 5, and travels in the irradiation direction of the signal lamp 1.

On the other hand, the light radiated from the LED 4b of the other one of the luminescent colors disposed opposite to the light introducing portion 5a of the front lens 5 is relatively high, such as a transparent resin forming the front lens 5. It is introduced into a member having a refractive index and does not leak to the outside due to internal reflection due to a difference in the refractive index at the contact surface with air, but as if inside the front lens 5 due to internal reflection like propagation in a light guide. Is propagated.

When the light propagating in the front lens 5 reaches the reflection cut 5b, the light is reflected by the reflection cut 5b, and the traveling direction of the light is almost perpendicular to the front surface 5c of the front lens 5. Will be converted to an angle,
The light is emitted from the front surface 5c of the front lens 5 to the outside.

At this time, the front surface 5c of the front lens 5
Since the light from the LED 4a of one emission color is emitted as transmitted light from, one emission color and the other emission color are mixed with each other.
Light radiated as the signal lamp 1 has a prescribed color.

At the same time, by appropriately setting the pitch P between the reflection cuts 5b to be small, the light from the LED 4b of the other emission color can be uniformly distributed from the front surface 5c of the front lens 5. Since the front lens 5 appears to be radiated, color unevenness can be prevented from being felt even when the front lens 5 is directly viewed.

Further, a light introducing portion 5a is provided all around the outer edge portion of the front lens 5, and the other light emitting color LED 4b is arranged in a circular shape facing the light introducing portion 5a.
To each of the reflection cuts 5b, light from the LED 4b of the other emission color arrives from almost the entire circumference, and therefore, the reflection cut 5b performs reflection in the entire circumference. The reflected light does not deviate in one direction, and uniform light distribution characteristics can be obtained in all directions, up, down, left, and right of the signal lamp 1.

In the signal lamp 1 having the configuration described above, all of the light emitted from the LED 4b of the other emission color is changed in the irradiation direction by the reflection cut 5b. There is no limitation, so the number of LEDs 4b of one other emission color may be appropriately increased,
By increasing the number of colors, the color mixture ratio may be adjusted to obtain a desired chromaticity.

[0018]

As described above, according to the present invention, L
One of the EDs having one emission color is arranged on the back of the front lens, and the other of the LEDs having the other emission color is arranged so as to face the plate thickness surface of the front lens, and another LED is arranged inside the front lens. Light of one emission color is propagated, and light of the other emission color is emitted toward the irradiation direction side by a plurality of reflection cuts provided on the inner surface side of the front lens, thereby mixing with the one emission color. The signal lamp is configured so that the number required to obtain the chromaticity required for the emission color is small, and conventionally it has to be arranged at intervals. Although the color unevenness has occurred on the surface of the front lens, the LED of the other one emission color is arranged so as to face the plate thickness surface of the front lens, and the light of the other one emission color is placed in the front lens. The light in the front lens is propagated, and the light from the front lens is This type is assumed to emit light in the irradiation direction by the light source, to emit one of the other emission colors uniformly from the entire surface of the front lens, and to have no color unevenness when directly viewing the front lens. This has an extremely excellent effect on improving the quality of the signal lamp.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a signal lamp according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view illustrating an arrangement state of LEDs on a substrate according to the same embodiment.

FIG. 4 is an explanatory diagram showing a main part of the same embodiment in an enlarged manner.

FIG. 5 is a sectional view showing a conventional example.

FIG. 6 is a front view showing an arrangement state of LEDs on a substrate of a conventional example.

FIG. 7 is an explanatory diagram showing a state of occurrence of color unevenness on a front lens surface of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Signal lamp 2 ... Housing 3 ... Substrate 4 ... LED 4a ... LED of one emission color 4b ... LED of another emission color 5 ... Front lens 5a ... Light introduction part 5b …… Reflection cut 5c …… Front

Claims (1)

[Claims] 1. A light source in which two types of LEDs having different emission colors are mixed at a predetermined ratio, and the two types of LEDs are used as a light source.
In a signal lamp configured to obtain irradiation light of a prescribed color by mixing light emitted from the LED, one of the LEDs having one emission color is disposed on the back of a front lens, and the irradiation light is transmitted through the front lens to emit irradiation light. And the other one of the LED's emission color is arranged to face the plate thickness surface of the front lens to propagate light of the other emission color into the front lens, A signal characterized in that a plurality of reflection cuts provided on the inner surface side of the front lens emit light of the other one emission color toward the irradiation direction, thereby performing color mixing with the one emission color. Lighting fixtures.