JPH0154760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pedestrian traffic signal light using a flat fluorescent lamp.

Prior Art As shown in Fig. 1, a conventional pedestrian traffic signal light is composed of a front prism 1, a color filter 2, an incandescent bulb 3 (60W), a reflector 4, and a socket 5. The color and pattern of the signal lamp are recognized by the light emitted from the signal lamp 3 and transmitted through the color filter 2 and the front prism 1.

Problems to be Solved by the Invention However, when such a pedestrian traffic signal light is used, the following problems occur.

(1) Since it has a lens system consisting of a front prism 1 and a color filter 2, even when the pedestrian traffic signal light (hereinafter referred to as a signal light) is not lit, the parallel incident light from the sun is reflected in the incandescent light bulb. The light is focused at the filament position No. 3, making it appear as if the filament is emitting light, and has almost the same color as the signal light, making it difficult to distinguish whether the signal light is on or off.

(2) Since it has a reflector plate 4, even when the signal light is not lit, incident sunlight is reflected by the reflector plate 4, producing light with almost the same color as the signal light.
Similar to the previous item (1), it is difficult to distinguish between signal lights being on and off.

(3) Light is generated by specular reflection of sunlight on the surface of the front prism 1 of the signal light, and when this reflected light becomes strong, it becomes impossible to see the color even when the signal light is turned on.

(4) The light emitted from the incandescent light bulb 3 passes through the color filter 2 and prism 1 on the front, causing luminous flux attenuation, which causes low efficiency. especially,
In the case of blue signal lights, the blue color is achieved by combining an incandescent bulb 3 with a spectral distribution mainly on the long wavelength side and a blue filter that transmits light on the short wavelength side, which further reduces efficiency. .

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a doll pattern portion 8 in which an anti-reflection multilayer film 13 for preventing specular reflection is applied on the outside and a white light-emitting phosphor is applied on the inside. and a doll pattern background part 9 coated with a red or blue light-emitting phosphor, a front glass 7 coated with two-color phosphor materials, and a back glass 14 coated with a visible light absorbing material 15 on the outside.
The discharge tube body 6 has a meandering discharge path 11.

Effects The present invention can improve the shortcomings in visibility and efficiency of conventional pedestrian traffic signal lights by the above-mentioned means.

Embodiment An embodiment of a pedestrian traffic signal light according to the present invention will be described based on the drawings. FIG. 2 is a diagram explaining the structure of a discharge lamp that constitutes a pedestrian traffic signal light, and is a lamp that applies low-pressure mercury vapor discharge from a hot cathode. The discharge tube is filled with liquid mercury and rare gases such as Ar and Ne. This discharge occurs at the electrode 12a
occurs along the discharge path 11 between and 12b,
The phosphor is irradiated with radiation of 185 nm and 254 nm in the spectrum of mercury atoms caused by the discharge, causing the phosphor to emit light. In FIG. 2, a phosphor is coated on the inside of a front glass 7 that constitutes a part of the discharge tube body 6. In this case, the doll pattern 8 is filled with a white-emitting phosphor such as calcium halophosphate phosphor, and the doll pattern background 9 is filled with a red-emitting phosphor (for example, Y ₂ O ₃ :
Eu ³⁺ ), and in the case of a blue signal, a blue-emitting phosphor (for example, BaMg ₂ A ₁₆ O ₂₇ :Eu ²⁺ ) is coated. As a result, when the red light comes on,
The doll pattern area 8 is white, and the doll pattern background area 9 is white.
emits red light. Although it is possible to reverse this and make the doll pattern 8 red and the doll pattern background part 9 white, the reason for specifying it as above is as follows. The particle size of the calcium halophosphate phosphor is about 7 to 8 μm, which is 2 to 3 times larger than other phosphors such as Y ₂ O ₃ :Eu ³⁺ . Therefore, calcium halophosphate has a higher transmittance in the visible range when not lit.

On the other hand, the total area of the doll pattern section 8 is about 1/5 or less compared to the doll pattern background section 9. Therefore, if the calcium halophosphate phosphor is used for the doll pattern 8 having a small total area, the amount of outside light entering the inside of the lamp will be reduced.

FIG. 3 is a longitudinal sectional view of the pedestrian traffic signal light of the present invention, in which an antireflection multilayer film 13 made of MgF ₂ , ZrO ₂ , etc. is applied to the outside of the front glass 7 to prevent specular reflection. There is. This reduces the specular reflectance to about 1/100.

A visible light absorbing material 15 is coated on the outside of the back glass 14 that constitutes a part of the discharge tube body 6, and visible light is emitted into the discharge tube from the phosphor coated on the inside of the front glass 7 of the discharge tube. absorb light. With this configuration, when the lamp is lit, the doll pattern section 8 is white and the doll pattern background section 9 shines red, and the total amount of light entering the lamp from the doll pattern section 8 is small.
It is absorbed by the visible light absorbing material 15 on the back side and does not affect the surface.

Furthermore, the antireflection multilayer film 13 applied to the front glass 7 reduces specular reflection of sunlight, significantly improving the visibility of the signal light.

Although the above explanation has focused on red lights among pedestrian traffic lights, the same principle applies to green lights as well.

In the interior of the discharge tube main body 6, a meandering discharge path 11 shown by a dashed line in the figure is formed by providing a partition 10 between the electrodes 12a and 12b. At the connection portion between the front glass 7 and the partition 10, the thickness of the partition 10 is reduced as shown in FIG. This prevents the shadow 10 from appearing on the outside when the signal light is turned on.

Although the present invention is constructed as described above, by simply changing the coating pattern of the phosphor corresponding to the doll pattern portion 8 and the doll pattern background portion 9 of the front glass 7 of the discharge tube body 6, it can be used as a guide light or as a guide light. It can also be used for other signs.

Effect of the invention The effects of the present invention are shown below.

(1) Since it does not have a lens system, no matter how strong the parallel incident light from the sun is when it is turned off, the entire surface of the signal light remains white, making it easy to confirm whether it is turned on or off.

(2) By removing the reflector 4, there is no reflected light from incident sunlight, and when the signal light is turned off, 1)
Similarly, the entire surface of the signal light becomes white, and it turns on and off.
To confirm whether a light is turned off can be done reliably and easily.

(3) Since the anti-reflection multilayer film 13 prevents specular reflection of sunlight on the front surface of the signal light, the information of the signal light can be clearly recognized.

(4) There is no attenuation of the luminous flux due to the color filter 2 and the front prism 1, resulting in high efficiency and the prevention of energy waste.

As described above, the present invention realizes improvements in visibility and efficiency, and is highly effective as a pedestrian traffic signal light.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an outline of a conventional pedestrian traffic signal light, Fig. 2 is an exploded perspective view of a pedestrian traffic signal light according to the present invention, and Fig. 3 is a longitudinal cross-section of a pedestrian traffic signal light according to the present invention. It is a front view. 6...Discharge tube body, 7...Front glass, 8...
Doll pattern section, 9... Doll pattern background section, 1
0... Shikiri, 11... Discharge pass, 12a, 12
b... Electrode, 13... Antireflection multilayer film, 14...
... Back glass, 15... Visible light absorbing material.

Claims (1)

[Claims] 1. A doll pattern section 8 coated with an anti-reflection multilayer film 13 for preventing specular reflection on the outside and coated with a white light emitting phosphor on the inside, and a doll pattern background coated with a red or blue light emitting phosphor. A pedestrian transportation system consisting of a front glass 7 constructed by separately painting a portion 9, a rear glass 14 coated with a visible light absorbing material 15 on the outside, and a discharge tube body 6 having a meandering discharge path 11. Signal light.