JPH08138192A - Road traffic signal lamp - Google Patents

Abstract

PURPOSE: To provide a blue-colored signal light to reduce such trouble that a person of first dyschromatopsia mistakes a red signal for a blue signal. CONSTITUTION: This signal lamp is constituted of a small light source A1 having chromaticity coordinates, the small light source B2 of the chromaticity coordinates and the light emitting surface 3 of a blue-colored signal. As shown in the enlarged figure 4 of the light emitting surface 3, the small light source A1 and the small light source B2 are distributed, and one blue-colored signal light is obtained on the whole. An LED, a fluorescence tube, or a small-sized electric lamp bulb can be used as the small light source. When the small light sources 1 and 2 are lighted at a time so as to secure required luminous intensity, the individual light source needs to be made the light source of low wattage. Generally, in the lamp bulb or the fluorescence tube, the lamp of the larger wattage has higher lamp efficiency. Accordingly, the saving of electric energy can be expected by lighting two kinds of the light sources alternately and in a short time instead of lighting them at a time. In this case, the flicker of a light color is never sensed, and the light color is perceived as a uniform color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic light used for controlling road traffic.

[0002]

2. Description of the Related Art In the current road traffic signal lights (three-color type),
Using a light bulb as a light source, light emitted from the light bulb is transmitted through a colored polycarbonate filter to obtain red, yellow, and blue signal lights. Regarding the colors of these signal lights, the chromaticity range and standard chromaticity coordinates are defined in the police regulation No. 9.

[0003]

The colors of road traffic signal lights are defined in consideration of the visibility of each of the three colors and the distinguishability of the colors. In this case, the definition is mainly based on the visibility and the distinctiveness with respect to the color vision deficient person, and the consideration for the color vision deficient person is not always sufficient. Therefore, as a method of presenting red, yellow, and blue signals, an ophthalmologist or the like has sometimes proposed a method of changing the number of signal lights or a method of changing the shape of light.

Not only people with normal color vision but also road users
Since there are not a few abnormal persons, more effective signal light is required for the distinctiveness of color blind persons. The present invention, in order to solve the above conventional problems, in a road traffic signal light,
It is an object of the present invention to provide blue signal light that reduces a person with a first color vision deficiency from misidentifying a red signal and a blue signal.

[0005]

In order to achieve the above-mentioned object, a traffic signal light used in the control of road traffic according to the present invention collects a plurality of types of small light sources having different main wavelengths and emits light of two or more colors. It is characterized in that blue signal light is obtained by mixing light.

In the above structure, it is preferable that a plurality of types of small light sources having a diameter of 10 mm or less, which have different main wavelengths, are collected to mix light. Further, in the above-described configuration, it is preferable that lights of different colors are alternately presented for a short time of 50 msec or less to mix the lights.

The traffic signal light used for controlling the road traffic according to the present invention has a wavelength range of 495 nm or less and 505 nm.
It is characterized in that the blue signal light is obtained by concentrating the spectral energy in each wavelength of the above wavelength range.

Further, the traffic light of the present invention considers the color vision characteristics of the first color vision deficient person, which is the most common color vision abnormality,
A person having the characteristics obtains a blue signal light by mixing light of two or more colors so that a blue signal is not mistakenly recognized as a red signal. A first means of the present invention is to obtain a mixed light of blue signal light by assembling a plurality of small light sources of different types having different main wavelengths.

The second means is to obtain the blue signal light by alternately presenting light sources emitting different colors for a short time and mixing the light. The third means is to obtain a blue signal light by causing a light source having a spectral distribution in which spectral energy is concentrated to a plurality of wavelengths to emit light.

[0010]

The traffic signal lamp according to the present invention provides the blue signal light by mixing two or more colors of light in consideration of the color vision characteristics of the first color blind person, which is the most common color vision abnormality. A person with color vision deficiency rarely misidentifies a green light as a red light.

By obtaining the blue signal light by concentrating the spectral energy at a plurality of wavelengths, it is possible to obtain the same effect with a single light source.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A signal lamp according to an embodiment of the present invention will be described below with reference to the drawings. (Example 1) From the study of the color vision characteristics of color vision deficient persons, the most common color condition in which the first color deficient person confuses with the same color (a normal person perceives as different color) has a confusion color curve shown in FIG. (From the Color Science Handbook, edited by the Japan Color Society). Further, FIG. 3 shows the chromaticity range of the road traffic signal lights in Japan (Traffic Control Facility Association: Traffic signal lamp specifications for vehicles). From the comparison between FIGS. 2 and 3, when the light color of the blue signal is shifted to green due to dirt or deterioration of the lamp, the chromaticity coordinate of the blue signal light approaches a confusion color curve with the red signal light, People with primary color blindness may be confused with the red light.

Here, if the blue signal light is given as a mixed light of the two colors of light shown in FIG.
It is perceived as chromaticity according to the current standard. On the other hand, for example, a first color vision deficient person having a low sensitivity of a cone (L cone) having a peak of sensitivity at long wavelengths has low sensitivity to yellow light, and thus perceives blue light and red light. It is easy to distinguish from the signal. The solid line in FIG. 4 represents the confusion color curve of the first color vision deficient person.

As one of the studies on visual characteristics, spatial frequency characteristics have been studied under various adaptation conditions (for example, Kelly DH; Spatiotemporal variation of).
chromaticand achromatic contrast thresholds. J. Op
t.Soc.Amer. Vol.73 (1983) 742-750). According to these studies, in general, the brighter the visual field, the higher the spatial resolution of vision. However, if there are about 20 or more bright and dark stripes within a range of 1 degree of visual angle, they will appear as stripes. Can no longer be seen and is perceived as a uniform surface. Therefore, if the distance between the light sources forming the signal lamp is set to 1/20 degrees (3 minutes) or less of the viewing angle, the signal lamp is perceived as a surface of uniform brightness. Assuming that the distance (10 m) when the road user near the stop line observes the signal of the front intersection is the closest distance when observing the signal lights, the viewing angle dimension of 3 minutes is about 9 mm. The above is the spatial resolution ability of the eye with respect to the difference in brightness, but the resolution ability with respect to the color difference is generally lower than the difference in brightness. Therefore, if the distance between the light sources is 10 mm or less, it can be said that the signal lamp is perceived as a surface light source of a uniform color even when viewed from a distance of 10 m.

A first embodiment of the signal light according to the present invention is shown in FIG.
Will be explained. In FIG. 1, 1 is a small light source A having chromaticity coordinates shown by A in FIG. 4, 2 is a small light source B having chromaticity coordinates shown by B in FIG. 4, 3 is a light emitting surface of a blue signal, and 4 is a portion 3. FIG. 1 and 2 are distributed as shown to provide one blue signal light as a whole. As a small light source, an LED, a fluorescent tube, or a small light bulb can be used. For displaying the blue signal, both the 1st and 2nd light sources can be turned on to obtain the required light color.

Further, in FIG. 1, if the small light sources 1 and 2 are turned on at the same time to secure a required luminous intensity, it is necessary to make each light source a low wattage light source. Generally, in a light bulb or a fluorescent tube, a lamp having a higher wattage has a higher lamp efficiency. Therefore, instead of turning on the two types of light sources at the same time, by alternately turning on the light sources for a short time, it is possible to expect a reduction in power energy. In this case, it is necessary to perceive a uniform color without perceiving the flicker of the light color.

In this regard, research has been conducted on the time-frequency characteristic of vision for colored light (for example, Hecht,
S., Shlaer, S .: Intermittent Stimulation by light.
V. The relation between intensity and critical fre
quency for different parts of the spectrum., J. Ge
n. Physiol. vol.19, (1936) 965). According to this, when the frequency is about 20 hertz or higher, the colors are visually mixed,
It can be said that it is perceived as a uniform color. Therefore, the light intensity of each of the 1 and 2 light sources is doubled, and each light source is alternately made to emit light for a light emission time of 50 msec or less as shown in FIG. Can be obtained at.

(Embodiment 2) In the first embodiment, a plurality of light sources having different light colors are simultaneously or alternately turned on to obtain a desired light color. On the other hand, discharge lamps such as fluorescent lamps and metal halide lamps can intensively emit light of a specific wavelength. The second embodiment obtains the same effect as that of the first embodiment by using a single lamp in which the emission energy is concentrated in a plurality of wavelength bands as the light source of the blue signal light. FIG. 6 shows an example of the spectral distribution of the light source of the second embodiment. As shown in FIG.
By concentrating the emission energy near 0 nm and 490 nm, a person with normal color vision can perceive a color similar to that of the current blue traffic light, and can reduce the confusion with the red traffic light for the first color blind person. Is.

[0019]

As is apparent from the above embodiments, according to the present invention, a blue signal light that reduces false recognition of a blue signal light and a red signal light is efficiently and rationally emitted to a person with a first color vision deficiency. it can.

[Brief description of drawings]

FIG. 1 is a light emitting part of a blue signal light according to an embodiment of the present invention.

[Fig. 2] Confusion color curve of the first color blind person

[Figure 3] Chromaticity range of road traffic lights

FIG. 4 is a chromaticity coordinate of light forming blue signal light according to an embodiment of the present invention.

FIG. 5: Presentation time of light constituting blue signal light in one embodiment of the present invention

FIG. 6 is a spectral distribution of a signal light source according to an embodiment of the present invention.

[Explanation of symbols]

 1 Small light source A 2 Small light source B 3 Light emitting surface for blue signal 4 Part of light emitting surface

Claims (4)

[Claims] 1. A traffic signal light used for controlling traffic of a road, wherein blue signal light is obtained by collecting a plurality of small light sources of different kinds having different main wavelengths and mixing light of two or more colors. A characteristic road traffic light. 2. A plurality of types of diameters having different dominant wavelengths of 10 mm
The road traffic signal light according to claim 1, wherein a plurality of the following small light sources are collected to mix light. 3. The road traffic signal light according to claim 1, wherein lights of different colors are alternately presented for a short time of 50 msec or less to mix lights. 4. A traffic signal light used for controlling traffic of a road, wherein blue signal light is obtained by concentrating spectral energy in each wavelength range of wavelengths of 495 nm or less and 505 nm or more. A characteristic road traffic light.