JP4966092B2 - Internal illumination display - Google Patents

Description

  The present invention relates to an internally illuminated display used outdoors, and more particularly to an internally illuminated indicator such as a train traveling direction indicator with a warning display function equipped in a level crossing alarm.

  The internally-illuminated display has a light source inside the display, and uses the light source as a backlight to display characters, symbols, or the like based on light transmission or color difference on the display surface. Conventionally, a light bulb or a fluorescent tube has been used as a light source for an internally-lit display, but in recent years, an internally-lit display using an LED as a backlight has been put into practical use from the viewpoint of power saving and long life. became. Since LEDs are small as a light source, a plurality of LEDs are generally arranged evenly on a substrate to emit light uniformly over a certain area.

  The internally-illuminated display is used, for example, as a train traveling direction indicator for a railroad crossing alarm. The train direction indicator is a mechanism that displays “kosho” when the railroad crossing is interrupted for a certain period of time. Due to this mechanism, in recent years, painful accidents have occurred where passers-by contacted the train. At the time of the accident, the train operation was disturbed and the level crossings were continuously interrupted, so the “travelling” indicator on the train direction indicator indicated that the passerby had broken down and the breaker was getting off. It is said that it was caused by entering the railway crossing.

  Based on this accident, the “Kosho” indication itself on the train direction indicator is abolished, and in order to further ensure the safety of the passerby, the train direction indicator indicates to the passer “Enter the level crossing”. It was planned to install a warning device (called a warning display device) that calls attention such as “prevention” and “detour promotion”, and the following required specifications were presented by the railway company.

That is,
(1) The wording to be displayed shall be “Don't pass while traffic is blocked.
(2) Since the light is always turned off, letters should not be mistaken even when exposed to light such as the West.
(3) The chassis dimensions are the same as the train direction indicator.
(4) Control shall be the same blinking as the “pepper” display.
That's it.

  In order to realize an internally-illuminated warning display using the LED as a backlight and satisfying the above-mentioned required specifications, the inventors firstly have a light source in which the LEDs are arranged evenly in the vertical and horizontal directions on the printed board, and the red light of the LED. Using a combination of an existing milky white diffusion plate that diffuses the LED and an existing purple filter that transmits the red light of the LED, a cut-out warning display character is printed on the back surface of the diffusion plate.

By printing the warning display characters on the back of the diffuser plate, there was no phantom display even when the sun hits, so the situation of misidentifying the characters was resolved. The outline of the alert display character 22 is blurred while the light passes, and the phantom display of the alert display character 22 is not recognized when the sun hits the sun, but the surface plate is affected by the milky white. There was a problem that the whole 21 became whitish as shown in the figure, and it was not satisfactory as a function of a warning display.
Sankosha Review 2006 No16 (issued on February 25, 2006) P6 to P8 “Development of warning display (LED type)”, Engineering Department Shinichiro Ariga, Engineering Department Masahiko Natori

The problems to be solved are: a light source in which LEDs are evenly arranged vertically and horizontally on a substrate, an existing milky white diffusion plate that transmits and diffuses red light from the light source, and an existing light that transmits red light that has passed through the diffusion plate. In combination with the purple filter of the above, the cut-out warning display character printed on the back side of the diffuser plate has a blurred outline of the warning display character. There is a problem that the entire warning display character becomes whitish under the influence of the milky white color, and it is not satisfactory as a function of the warning display of the train traveling direction indicator.

  The present invention uses a combination of a light source in which LEDs are uniformly arranged vertically and horizontally on a substrate, an existing milky white diffusion plate that diffuses the red light of the LED, and an existing purple filter that transmits the red light of the light source. The point is the same as before, but the cutout warning display character is printed on the front side of the diffuser, and the outer surface is covered with a smoke coat of the same color as the ground color of the cutout warning display character. It is characterized by that.

The internal display according to the present invention substantially maintains a light emission luminance of a certain level or more within a thickness range by a combination of a milky white diffusion plate and a purple filter that transmits red light, and The phantom display of the alert display character is not caused by receiving the western sun directly.

For the purpose of maintaining a light emission brightness above a certain level and avoiding the appearance of illusion of displayed characters even when the sun is received directly, the surface of the milky white diffusion plate that diffuses the red light of the LED used as the light source is darkened. The thickness of the combination of the diffusion plate and the filter is applied by screen printing a dark smoke coat of the same type as the background of the cutout warning display character, with a display film on which the cutout warning display character is formed. Realized within the range .

  Examples of the present invention will be described below. In FIG. 1, the internally illuminated display according to the present invention is incorporated in the body of a train traveling direction display. In the embodiment, this will be described as a warning display. The conventional train direction indicator has a red arrow indicating the train direction and a “kosho” display window. In this embodiment, the train direction indicator is also attached to the column 2 of the railroad crossing alarm 1. As shown in FIG. 2 (a), the housing of the warning display 3 has a red arrow display unit 4 that displays the traveling direction of the up and down trains as a function of the train traveling direction display. As a warning display function, it has display units 5a and 5b for displaying warning display characters such as “Driving is blocked” and “Do not pass around.

  The characters “Do not pass”, “Do n’t pass, please go to other places” are a series of signs, but in this example, they ’re marked as “Driving is blocked”, “Do n’t pass, go to other places” Are configured as separate display units 5a and 5b. In the following description, the display unit 5a that displays “passing traffic” will be described as a representative. The same applies to the display unit 5b displaying "Please turn". However, both display units 5a and 5b may be one display unit.

  In the present invention, as shown in FIG. 3 (b), the display unit 5a includes a set of LEDs 7a, 7a,... As light sources 7 arranged evenly vertically and horizontally on the surface of the substrate 6, and FIG. As shown, the light source 7 has a combination of a milky white diffuser plate 8 for diffusing the red light and a purple filter 9 for transmitting the red light of the light source 7, and the surface of the diffuser plate 8 is cut out on a black background. A display film 10 printed with a warning display character (in this example, “passing traffic”) is stacked, and the surface of the display film 10 of the display character has a smoke coat 11 of the same color as the ground color of the display character. It is coated with.

  The diffusion plate 8 is a milky white acrylic plate that diffuses transmitted light, and the filter 9 is a purple acrylic plate that effectively transmits red light. The display film 10 and the smoke coat 11 for cut-out display characters are laminated in two layers on the surface of the diffusion plate 8 facing the filter 9 by using, for example, a screen printing method. The diffusing plate 8 has a performance of sufficiently diffusing the transmitted light to uniformly emit the cut-out display characters, and the filter 9 has a performance of allowing the cut-out characters to be transmitted evenly in the daytime. It is necessary to be.

  A combination of a filter 9, a laminate of a diffusion plate 8 having a printed film 10 of display characters and a smoke coat 11 formed on the surface thereof, and a light source 7 that is evenly arranged vertically and horizontally on the surface of the substrate 6 is incorporated in a box. The display unit 5a of the warning display 3 is assembled to the body of the warning display 3 together with the display unit 5b that displays the display character "Please do not turn around." Attach to pillar 2. As shown in FIG. 3C, the LED 7a of the light source 7 is connected in parallel to the power supply circuit 12 by a plurality of LED wiring sets in which several LEDs 7a, 7a,. Thereby, even if one of the LEDs 7a, 7a,... Is broken, wiring is performed so that a certain luminance as the light source 7 is ensured.

  Next, a description will be given of how the problem of the display at the time of lighting and the phantom display at the time of extinction by the combination of the milky white diffusion plate 8 and the purple filter 9 is solved. In FIG. 4A, the display film 10 of the alert display character is interposed between the surface of the milky white diffusion plate 8, that is, the diffusion plate 8 and the filter 9, so that the filter 9 is transmitted when the light source 7 is turned on. Thus, the display character of the display film 10 can be clearly seen. However, when the sun light hits the surface of the filter 9 at the time of extinction, the character part becomes whitish, and the contrast between the black background and the white of the cut-out character And the character can be clearly recognized through the filter 9.

  Next, as shown in FIG. 4 (b), between the filter 9 and the diffuser plate 8, a transparent colored black smoke that is the same system as the background of the cut-out character display film 10 is translucent. When the display film 10 of the display character on the surface of the diffusion plate 8 is covered with the acrylic plate 13, the effect of preventing the phantom display against the western sun is sufficiently recognized. Specifically, the warning display 3 The characters could not be seen unless approached to 1m.

  It was also found that there was almost no decrease in light emission luminance and sufficient brightness was secured. However, it has been found that if a gray smoke acrylic plate 13 is interposed between the filter 9 and the diffusion plate 8, a problem occurs in the display unit of the alert display 3. That is, the board 6 of the LED 7a and the terminal block (not shown) are too close. For this reason, even in the state where the gray smoke acrylic plate 13 is interposed, it has become necessary to fit within the thickness range of the two acrylic plates of the diffusion plate 8 and the filter 9. is there. In order to solve this problem, in the present invention, as shown in FIG. 4 (c), the black background is applied by the smoke coat 11 having the same color as the background color of the display character and having the same effect as the gray smoke acrylic plate. The surface of the display film 10 for cut-out display characters is coated.

  Table 1 uses brown and gray paints as samples, and adjusts the blending ratio of the paint to change the paint blending ratio of the smoke coat in various ways. The overall evaluation was made for each sample. The results are shown in Table 1.

As described above, when the combination of the milky white diffusion plate 8 and the purple filter 9 is used and the black background cutout display characters are printed on the surface of the milky white diffusion plate 8 based on the results shown in Table 1, the paint blending ratio 20 As a result, it was most desirable to cover the display film 10 of the display character with the smoke coat 11 of the gray paint of%.

  Furthermore, the higher the paint blending ratio, the lower the emission luminance. Conversely, the lower the paint blending ratio, the clearer the characters appear when the sun is received. From these results, the practical range of the gray paint blending ratio was determined to be 15% to 30%. The brown paint was used for reference only, and the overall evaluation was not much different from that of the gray paint. However, in reality, the luminance was inferior and the background of the display characters was black. There seemed to be something wrong with black and brown.

  In the present invention, each display uses a laminate of a milky white diffusion plate 8 made of an existing acrylic plate and an existing purple filter 9, and the diffusion plate 8 has a display character display film and smoke. Since the coating film of the coat 11 is provided, the two acrylic plates of the diffusion plate 8 and the filter cannot be bonded together. For this reason, there is a concern that when moisture enters the joint between the diffusion plate 8 and the filter 9, the appearance of display characters may be hindered, but according to the results of the watering test, the filter 9 Even when moisture enters the joint with the diffusion plate 8, no obstacles have been observed in how the displayed characters are seen when the lamps are turned on and in the prevention of the illusion of the characters when the lights are turned off.

  In the above embodiment, an example in which a purple acrylic plate is used for the filter has been described. By using an acrylic plate for the filter, the filter can also be used as a surface protection plate. However, the invention is not limited to the case of using an acrylic plate, and a purple-colored paint coat is formed on the surface of the smoke coat by screen printing. Thus, the function of the filter can be obtained, which is convenient for unitization of the display. In this case, it is necessary to cover the surface with a transparent surface protection plate.

  The present invention can be widely used not only for railroad crossing safety devices, but also for internally illuminated displays used outdoors, including a train traveling direction indicator equipped with a warning display function equipped on a level crossing alarm. it can.

It is a figure which shows the railroad crossing alarm device provided with the internally-lit display according to the present invention as a warning display. (A) is a front enlarged view of a warning display to which the present invention is applied, and (b) is a cross-sectional view taken along the line Aa of (a). (A) is a partial cross-sectional view of a laminate of a filter in an internally-illuminated display according to the present invention, and a diffusion plate having a printed film of display characters and a smoke coat formed on the surface, and (b) is a filter and display characters The figure which shows the relationship between lamination | stacking of the diffusion plate which formed the printing film of this, and the smoke coat on the surface, and a light source, (c) is a figure which shows the wiring of LED. (A) is a diagram showing a problem due to the lamination of the filter, display characters and the diffusion plate, (b) is a lamination in which a gray smoke acrylic plate is further combined with the lamination of the filter, the display characters and the diffusion plate. The figure shown, (c) is a figure which shows the lamination | stacking of the diffusion plate which formed the filter by this invention, the printed film of the display character, and the smoke coat on the surface. It is a figure which shows the problem of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Railroad crossing warning machine 2 Machine pillar 3 Warning display 4,5a, 5b Display unit 6 Board | substrate 7 Light source 7a LED
8 Diffusion plate 9 Filter 10 Display film 11 Smoke coat 12 Power supply circuit 13 Acrylic plate

Claims (3)

A light source, a milky diffusion plate, a table示膜and UchiTerukatachi display having a smoke coating, a combination of the purple color of the filter,
The light source is configured by uniformly arranging LEDs on a substrate, and irradiates red light toward the diffusion plate,
The diffusion plate is transmitted through the red light source at milky, which cause diffusion,
The display film and the smoke coat are laminated in two layers on the surface of the diffusion plate facing the filter,
The display film is a printing surface applied to the surface of the diffusion plate, and a warning display character is formed by cutting out a part of a dark background of printing, and the cut-out display character transmits light transmitted through the diffusion plate. Receiving light,
Smoked Court by the gray paint is a coating film of the color of the earth and the same strain of the display film, not covering the surface of the display film, the surface of the scan Mork coat is covered by the filter, note of the display film This prevents the illusion display of the display letter of the awakening against the western day,
The internal-display-type display device , wherein the filter transmits red light when a light source is turned on, and transmits display of a warning display character by cutting out the display film . The diffuser plate is a milky white acrylic plate that has light permeability and diffuses transmitted light,
The filter is an acrylic plate that effectively transmits red light,
2. The internally illuminated display according to claim 1, wherein the display film and the smoke coat are laminated in two layers on the surface of the diffusion plate using a screen printing method. It has a combination of a milky white diffusion plate having a display film and a smoke coat, and a purple filter,
The display film is formed by cutting letters on a part of the black ground on the surface of the diffusion plate,
2. The internal illuminating shape according to claim 1, wherein the smoke coat includes a gray paint, and is adjusted so that a mixture ratio of the gray paint in the whole paint is 15% to 30%. display.