JP2005002773A - Road guidance display device and lighting device - Google Patents

Abstract

Provided is a road guidance display device 11 that can improve the visibility of light 22 even in bad weather and can reliably guide and display a boundary 30 between a roadway 28 and a shoulder 29 of a road 27.
A road guidance display device 11 includes a light projecting unit 21 having a lamp and light control means for controlling light of the lamp. Light 22 having a peak luminous intensity of 30000 cd or more, that is, light 22 having a peak luminous intensity equal to or higher than that of the headlight of the vehicle A traveling on the road 27 is projected from the light projecting unit 21. Since the light 22 has a high light output from the light projecting part 21 and can project the pillar 22a of the light 22, the visibility as the pillar 22a of the light 22 is improved even in bad weather, and the boundary 30 between the roadway 28 of the road 27 and the shoulder 29 Is surely displayed.
[Selection] Figure 1

Description

  The present invention relates to a road guidance display device that guides and displays a position or the like on a road with light, and an illumination device including the road guidance display device.

  Conventionally, road lights that normally illuminate the road are lit according to the surrounding brightness to illuminate a predetermined area of the road, but during bad weather such as snowfall, snow in the area below the road light is snowing. There may be a light curtain that only illuminates, or degrading glare.

  Also, in snowy areas etc., when the boundary between the road and the shoulder of the road is buried due to snow, the boundary can not be determined, so so-called arrow feathers are installed downward corresponding to the upper position of the road boundary, The driver who drives the vehicle is guided and displayed so that the driver can drive while checking the boundary of the road with arrow feathers installed at predetermined intervals along the road. However, during bad weather such as snowstorms, the visibility of arrow feathers is reduced, and sufficient guidance display cannot be performed.

Therefore, a laser irradiation device is installed side by side with arrow blades, and by irradiating a laser beam from the laser irradiation device toward the boundary of the road, the laser beam irradiates snow during snowfall, so that the laser irradiation device to the road There has been proposed a method in which an irradiated portion is shined as a single line so as to be visually recognized and is intended to be guided and displayed (see, for example, Patent Document 1).
JP 2002-201617 A (page 2-3, FIG. 1-2)

  However, at least the present inventor does not know that such a laser beam that performs guidance display in bad weather such as snowstorm has been put into practical use. According to the study by the present inventors, when the laser beam is irradiated from the laser irradiation device toward the boundary of the road, the light output of the laser beam is small and the laser beam is thin, so that sufficient visibility is obtained in bad weather such as a snowstorm. In addition, the laser beam color is limited, and it has been found that there is a problem that the degree of freedom in color selection is small, such as inability to select a color with high visibility.

  If it is attempted to obtain light that is visible even in bad weather with a laser, the laser device becomes enormous and expensive. For this reason, it is practically very difficult to line up with Yaha on the road.

  Moreover, since this laser irradiation apparatus is used outdoors, there is a possibility that people may look into it. At this time, there is a risk of damaging the eyes by the laser beam.

  The present invention has been made in view of the above points. A road guidance display device capable of improving the visibility of light even in bad weather and reliably guiding and displaying a position on a road, and the road guidance display device. An object of the present invention is to provide a lighting device provided.

  The road guidance display device according to claim 1 includes a light projecting unit having a lamp and a light control means for controlling light of the lamp, and projects light having a peak luminous intensity of 30000 cd or more from the light projecting unit on the road. is there.

  In this configuration, the light of the lamp is collected on the road by using, for example, a lens, a reflecting mirror, or the like as a light control unit, condensing the light of the lamp using a slit, or using a lamp having a large luminous flux. By projecting light with a peak luminous intensity of 30000 cd or higher, that is, light with a peak luminous intensity higher than that of a headlight of a vehicle traveling on a road, it is possible to easily form a light column with a large light output and to select a color. Because of the high degree of freedom, the visibility of the light pillar is improved even in bad weather, and the position on the road is reliably guided and displayed. Further, as the lamp, a high-intensity discharge lamp, a halogen bulb, or the like is used, which is cheaper than the laser irradiation apparatus and can be downsized.

  The road guidance display device according to claim 2 is the road guidance display device according to claim 1, wherein the 1/2 beam angle of the light projected from the light projecting unit is 1 ° or less, and the 1/10 beam angle is 2 ° or less. It is what is.

  In this configuration, by setting the 1/2 beam angle of the light to be projected to 1 ° or less and the 1/10 beam angle to 2 ° or less, it is clearly recognized as a light column and visibility is improved. .

  The road guidance display device according to claim 3 is the road guidance display device according to claim 1, wherein the shortest length on the irradiation surface of 1/10 beam angle of the light projected from the light projecting unit is 50 mm or more and 300 mm or less. Is.

  In this configuration, the size of the cross section of the light projected from the light projecting unit is defined as the size of 1/10 beam angle on the irradiation surface. The shortest length of 1/10 beam angle is the diameter when the shape of the irradiated surface is a circle, the short side when the shape of the irradiated surface is rectangular, and the short diameter when the shape of the irradiated surface is elliptical. Is shown.

  If this shortest length is less than 50 mm, the cross section of the light becomes too thin, making it difficult to view in bad weather. In addition, if the shortest length exceeds 300 mm, the power of the lamp is increased and the size of the apparatus is increased, resulting in a problem in economy. Furthermore, the shortest length is preferably 100 mm to 300 mm, more preferably 200 mm to 300 mm, thereby improving visibility.

  The road guidance display device according to claim 4 is the road guidance display device according to any one of claims 1 to 3, wherein a light intensity value in a 90 ° vertical direction of light projected from the light projecting unit is 10 cd per 1000 lm of lamp light flux. In the following, the luminous intensity value in the direction of the vertical angle of 80 ° is 30 cd or less per 1000 lm of the lamp luminous flux.

  In this configuration, the luminous intensity value in the 90 ° vertical angle direction of the projected light is 10 cd or less per 1000 lm of lamp light flux, and the luminous intensity value in the vertical angle 80 ° direction is 30 cd or less per 1000 lm of lamp luminous flux, Generation of glare to the driver of the vehicle traveling on the road is suppressed.

  A road guidance display device according to a fifth aspect is the road guidance display device according to any one of the first to fourth aspects, wherein the light output of the lamp is changed according to the environment.

  In this configuration, for example, visibility can be ensured and energy can be saved by changing the light output of the lamp in accordance with the environment such as ambient brightness and weather.

  The lighting device according to claim 6 comprises: a lighting fixture that illuminates the road surface; and the road guidance display device according to any one of claims 1 to 4 that projects light toward the road surface. .

  And in this structure, since it provided with the lighting fixture which illuminates a road surface, and the road guidance display apparatus as described in any one of Claims 1 thru | or 4 which projects light toward a road surface, it is normal with one illuminating device. It can be used by switching between road lighting and guidance display in bad weather.

  According to a seventh aspect of the present invention, in the lighting device of the sixth aspect, the lighting device is switched between lighting and the road guidance display device is switched according to the environment.

  In this configuration, for example, by switching between lighting of the lighting fixture and lighting of the road guidance display device according to the environment such as ambient brightness and weather, a single lighting device can be used for normal road lighting and bad weather. It is possible to use it by switching the guidance display appropriately.

  According to the road guidance display device of the first aspect, the lamp is used instead of the laser irradiation device, and the light having a peak luminous intensity of 30000 cd or more from the light projecting unit on the road, that is, the headlight of the vehicle traveling on the road By projecting light above the peak luminous intensity, it is possible to form a light column with a large light output and a high degree of freedom of color selection, so the visibility of the column of light can be improved even in bad weather, roads It is possible to reliably display the position on the top. In addition, since a lamp other than the laser light source is used, it is possible to provide such a large and thick light column while providing a relatively inexpensive and small-sized column. Is possible.

  According to the road guidance display device of claim 2, in addition to the effect of the road guidance display device of claim 1, the 1/2 beam angle of the light to be projected is 1 ° or less and the 1/10 beam angle is 2 By setting it to less than or equal to °, it can be clearly recognized as a light column, and visibility can be improved.

  According to the road guidance display device according to claim 3, in addition to the effect of the road guidance display device according to claim 1, the shortest length on the irradiation surface of 1/10 beam angle of the light projected from the light projecting unit is reduced. By setting it to 50 mm or more and 300 mm or less, it is possible to prevent the cross section of light from becoming too thin and difficult to see in bad weather as in the case where the shortest length is less than 50 mm, and the shortest length exceeds 300 mm. As a result, it is possible to prevent a problem in economic efficiency by increasing the power of the lamp or increasing the size of the apparatus.

  According to the road guidance display device of the fourth aspect, in addition to the effect of the road guidance display device according to any one of the first to third aspects, the luminous intensity value in the 90 ° vertical angle direction of the light to be projected is a lamp luminous flux of 1000 lm. When the light intensity value in the direction of 80 deg. Per corner and the luminous intensity value in the vertical angle 80 ° direction is 30 cd or less per 1000 lm of lamp light flux, the occurrence of glare to the driver of the vehicle traveling on the road can be suppressed.

  According to the road guidance display device of the fifth aspect, in addition to the effect of the road guidance display device according to any one of the first to fourth aspects, the light output of the lamp is controlled according to the environment such as ambient brightness and weather. By changing, it is possible to ensure visibility and save energy.

  According to the illuminating device described in claim 6, since the illuminating device that illuminates the road surface and the road guidance display device according to any one of claims 1 to 5 that projects light toward the road surface, The lighting device can be used by switching between normal road lighting and guidance display in bad weather.

  According to the illuminating device of claim 7, in addition to the effect of the illuminating device of claim 6, for example, switching between lighting of the luminaire and lighting of the road guidance display device according to the environment such as ambient brightness and weather. Thus, it is possible to switch between normal road lighting and guidance display in bad weather with a single lighting device.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 5 show a first embodiment, FIG. 1 is an explanatory diagram of the state of use of a road guidance display device, FIG. 2 is a configuration diagram of the road guidance display device, and FIG. FIG. 4 is a graph showing the light distribution of the road guidance display device, and FIG. 5 is a diagram showing the vertical angle 90 ° and the vertical angle 80 ° of the road guidance display device.

  As shown in FIG. 2, the road guidance display device 11 has a case 13 having a light projection opening 12 for projecting light at one end in the optical axis direction. A lamp 14 which is an HID lamp such as an ultra-high pressure mercury lamp (UHP) having a distance between the lamp and the electrode of 1.5 mm or less is accommodated, and a reflecting mirror 15 for condensing and reflecting the light from the lamp 14 in the optical axis direction. The light of the lamp 14 having an aperture 16 in which a circular slit is arranged at the focal point of the reflected light reflected by the reflecting mirror 15, and a lens 17 that condenses the light that has passed through the slit of the aperture 16 in parallel with the optical axis direction. An optical system 18 as a light control means for controlling the light is accommodated and disposed, and a ballast 19 as a lighting device for lighting the lamp 14 is accommodated and disposed. The light projection opening 12 of the case 13 is closed with a protective plate 20 made of glass or resin and having translucency. A light projecting unit 21 is configured including the case 13 and the optical system 18, and the light projecting unit 21 projects light 22 having a peak luminous intensity of 30000 cd or more. The color of the light 22 is white or a color that takes into account the background color.

  The ballast 19 is controlled by the control unit 23.This control unit 23 has a function of variably controlling the light output including lighting and extinguishing of the lamp 14 according to the environment such as snowfall, rainfall, fog, and traffic volume. is doing. For example, based on detection from the detection device 24 that detects the amount of snowfall (the same applies to the amount of snowfall, fog density, etc.), when the amount of snowfall exceeds a predetermined amount, the lamp 14 is normally lit at the rated output, and the amount of snowfall is reduced. Is controlled so as to decrease the light output of the lamp 14, and this control is executed according to a program set in advance through experiments. In addition to this, alone, for example, based on the time information from the timer 25, the lamp 14 is normally lit from evening to midnight, and the light output of the lamp 14 from midnight to early morning when the traffic volume of the vehicle is low You may make it control according to traffic volume and a time slot | zone so that it may fall. The detection device 24 used for detecting the environment is, for example, an environmental transmittance meter, which irradiates laser light from the projector to the light receiver and determines the amount of snowfall, rainfall, and fog concentration from the ratio of the amount of light reaching the light receiver. Find the state of the surrounding environment.

  As shown in FIG. 1, a road 27 is formed by a road 28 and a road shoulder 29 via a boundary 30. A plurality of pillars 31 whose upper ends are curved toward the roadway 28 are erected on the road shoulders 29 at predetermined intervals along the roads 27. The upper ends of these pillars 31 are directed toward the boundary 30 of the road surface 27a of the road 27. A road guidance display device 11 that projects light 22 is attached with the projection opening 12 facing downward. Further, on the column 31 or the road guidance display device 11, the tip side, that is, the lower end side is an arrow at a position that projects downward from the road guidance display device 11 and is illuminated by a part of the light 22 projected from the road guidance display device 11. A feather 32, which is a plate-shaped sign formed in a shape, is attached. That is, the arrow 32 is attached so that a part of the light 22 is irradiated on the plate surface facing the traveling direction of the vehicle A traveling on the roadway 28.

  And when it is not during bad weather such as snowfall, rain, fog, etc., the visibility of the arrow 32 is good, and the driver of the vehicle A traveling on the road 28 is installed along the road 27 at a predetermined interval. You can drive while checking the boundary 30 between the roadway 28 and the shoulder 29 with the arrow 32.

  Further, during bad weather such as snowfall, rain, and fog, the guide display is not sufficient with only the arrow 32, so the lamp 14 of the road guide display device 11 is turned on. When the lamp 14 is turned on, the light from the lamp 14 is reflected by the reflecting mirror 15, and the reflected light is parallel to the optical axis direction by the lens 17 through the slit of the aperture 16 for cutting the spread of the light 22 to the surroundings. The light 22 is condensed and is projected toward the boundary 30 between the roadway 28 and the road shoulder 29 through the projection opening 12.

  Since the projected light 22 irradiates snow, rain, fog, etc. during snowfall, the snow, rain, fog, etc. shine, so one pillar of light 22 from the road guidance display device 11 to the road surface 27a The boundary 22 between the roadway 28 and the road shoulder 29 is guided and displayed by the pillar 22a of the light 22. Therefore, as shown in FIG. 3, the driver of the vehicle A traveling on the road 28 confirms the boundary 30 between the road 28 and the shoulder 29 with the pillars 22a of the light 22 installed at predetermined intervals along the road 27. However, it is possible to drive while confirming the route of the road 27.

  Since the column 22a of the light 22 has a luminous intensity greater than the peak intensity of the headlight of the vehicle A traveling on the road 27, even if the column 22a of the light 22 is irradiated with the light of the headlight, the column 22a of the light 22 is surely Visible.

  Further, FIG. 4 shows the result of an experiment measuring the relationship between the luminous intensity and the emission angle of the light 22 projected from the road guidance display device 11, that is, the light projecting unit 21, in a snowfall environment. At this time, the peak luminous intensity is 1400000 cd, a is when the slit of the aperture 16 for cutting the spread of the light 22 to the surroundings is φ2.5 mm, and b when the slit is φ5 mm.

  When the slit of the aperture 16 is φ2.5 mm, the 1/2 beam angle, that is, 1400000/2 = 700,000 cd, was 0.9 °, and the 1/10 beam angle, that is, 1400000/10 = 14,000 cd, was 1.2 °. When the slit of the aperture 16 is b of φ5 mm, the 1/2 beam angle, that is, 1400000/2 = 700,000 cd was 1.0 °, and the 1/10 beam angle, that is, 1400000/10 = 14,000 cd, was 2.0 °.

  By setting the 1/2 beam angle to 1 ° or less and the 1/10 beam angle to 2 ° or less, it was clearly recognized as the column 22a of the light 22. That is, when the 1/2 beam angle is 1 ° or more and the 1/10 beam angle is 2 ° or more, the light 22 spreads and cannot be clearly recognized as the column 22a of the light 22.

  Then, the appearance of the light 22 was tested when the 1/10 beam angle was the diameter of the column 22a of the light 22. For example, an example in which the light projecting unit 21 of the road guidance display device 11 is attached at a height of 5 m from the irradiation surface of the road 27 is shown.

  The visibility of the light 22 at the time of snowfall when the diameter of the irradiation surface is a 1/10 beam angle of the irradiation surface when the shape of the irradiation surface is a circle and the distance between the road guidance display device 11 is 40 m, 60 m, and 80 m. Table 1 shows.

  φ5 mm is an example using laser light as in the prior art. The diameter of each irradiation surface is set by changing the distance between the lens 17 and the lamp 14.

  As shown in Table 1, the pillar 22a of the light 22 cannot be recognized with a laser beam of φ5 mm, and the pillar 22a of the light 22 can be recognized at φ50 mm or more, preferably φ100 to 300 mm, and more preferable range is The diameter was 200 to 300 mm. On the other hand, if the diameter exceeds 300 mm, the power of the lamp 14 is increased and the size of the apparatus is increased, resulting in a problem in economic efficiency.

  In the road guidance display device 11, the light distribution is controlled by the optical system 18 of the light projecting unit 21 to suppress the occurrence of glare for the driver of the vehicle A traveling on the road 27. As shown in FIG. 5, when the light 22 is projected downward from the translucent portion 21 in the vertical direction Y, the luminous intensity value in the direction of 90 ° to the vertical direction Y is 10 cd per 1000 lm of lamp light flux. In the following, the luminous intensity value in the direction of the vertical angle of 80 ° is set to 30 cd or less per 1000 lm of the lamp luminous flux. This is equivalent to the cut-off light intensity value of JIS C8131 “Road Lighting Fixture”, and the occurrence of glare for the driver of the vehicle A traveling on the road 27 can be suppressed.

  Table 2 shows the results of measurements of light utilization efficiency in various snow lamp environments for various lamps 14 having different lamp power, peak luminous intensity, and interelectrode distance. As the lamp 14, an ultra high pressure mercury lamp (UHP), a ceramic metal halide lamp (CDM), and an automotive HID lamp were compared.

  As a result, it was confirmed that the ultrahigh pressure mercury lamp (UHP) having a distance between electrodes of 1.5 mm or less has the highest light quantity efficiency. Therefore, by using an ultra high pressure mercury lamp (UHP) having a distance between electrodes of 1.5 mm or less as the lamp 14, the visibility of the pillar 22a of the light 22 can be improved, and by adjusting the light according to the weather, Low wattage can be achieved.

  As described above, according to the road guidance display device 11, light having a peak luminous intensity of 30000 cd or more obtained by condensing the light of the lamp 14 by the lens 17 on the road 27, that is, the headlight of the vehicle A traveling on the road 27. By projecting light 22 having a peak luminous intensity or higher, a light 22 having a high light output and a thick light 22 column 22a can be formed. Even if the light 22 is irradiated with the light of the headlight of the vehicle A, the light 22 Therefore, the visibility of the pillar 22a of the light 22 can be improved even during bad weather, and the position of the boundary 30 on the road 27 can be reliably guided and displayed.

  Moreover, in the road guidance display device 11, for example, by using an HID lamp such as a metal halide lamp, a halogen lamp, or an ultra high pressure mercury lamp (UHP) as the lamp 14, it is possible to select the color of the light 22 that is easily visible even in bad weather, etc. Since the degree of freedom of color selection is high, the visibility of the pillar 22a of the light 22 can be improved even in bad weather, and the position of the boundary 30 on the road 27 can be reliably guided and displayed. In this case, for example, the color can be changed between the upstream lane and the downstream lane of the road 27, and the upstream lane and the downstream lane of the road 27 can be recognized.

  In addition, for example, in the case of snowfall, the control unit 23 can ensure visibility by normally lighting the lamp 14 at the rated output when the amount of snowfall exceeds a predetermined amount of snowfall. Energy saving can be achieved by reducing the output.

  Furthermore, the controller 23 controls the lamp 14 according to the traffic volume and the time zone so that the lamp 14 is normally lit from the evening to midnight, and the light output of the lamp 14 is decreased from midnight until early morning when the traffic volume decreases. Thus, energy saving can be achieved.

  In particular, energy saving can be achieved by lighting the lamp 14 of the road guidance display device 11 only when the vehicle A passes through the mountain road 27 where the traffic volume is low. This is when a vehicle traffic sensor (for example, a device that detects a vehicle that crosses with infrared rays) is installed on the front side of the road A on the road guidance display device 11 and the vehicle traffic sensor detects the traffic of the vehicle A. Only the road guidance display device 11 is turned on. At this time, the plurality of road guidance display devices 11 can be controlled by the vehicle traffic sensors, and further, the plurality of road guidance display devices 11 can be turned on with a time difference as the vehicle A advances.

  Table 3 summarizes the relationship between the environment and the control of the light output of the lamp 14 by the control unit 23.

  In addition, when the road guidance display device 11 is turned on, a part of the light 22 to be projected is irradiated on the surface of the arrow 32, and the surface of the arrow 32 is shined. Visibility can be further improved by using together.

  Further, as shown in the second embodiment of FIG. 6, by reflecting the reflecting portion 32a from the edge of the arrow portion on the lower end side of the arrow 32 to the surface side irradiated with the light 22, the reflecting portion 32a Reflected reflected light is irradiated on the surface of the arrow 32, making the arrow 32 brighter and improving the visibility.

  The light projection direction of the light 22 of the road guidance display device 11 may be configured to be switched and moved between the direction of the road surface 27a and the direction of the arrow 32 according to the time zone or the like under the control of the control unit 23. . For example, the light 22 of the road guidance display device 11 is normally projected toward the road surface 27a, and the light 22 of the road guidance display device 11 is directed to the arrow 32 during the midnight hours when the traffic volume is low. By reducing the light output of the lamp 14, energy saving can be achieved while the visibility of the arrow 32 is ensured.

  Next, FIG. 7 shows a third embodiment in which the arrow 32 has a base 34 that is long in the vertical direction and a substantially triangular arrow part 35 connected to the lower end of the base 34. The arrow part 35 is bent and formed in a convex surface in which the central part of the surface opposite to the surface attached to the light projecting part 21 is convex.

  A rail 37 having a groove-like groove portion 36 having a substantially cross-sectional shape along the vertical direction is attached to the surface of the base portion 34 attached to the light projecting portion 21. The connecting means 38 including bolts provided at two upper and lower positions is slidably engaged and fixed, and the vertical position of the arrow 32 relative to the light projecting portion 21 can be adjusted.

  At the upper end of the light projecting portion 21, a mounting bracket 39 for mounting on the column 31 is mounted.

  Next, FIG. 8 shows a fourth embodiment in which the angle of the light projecting direction in which the light 22 is projected from the light projecting unit 21 is opposite to the traveling direction F of the vehicle A, that is, travels on the road 28. By directing in the direction of the driver of the vehicle A traveling in the direction F, the luminance of the pillar 22a of the light 22 viewed from the driver is increased, and thus visibility can be improved. The angle α of the light 22 with respect to the road surface 27a of the road 27 is preferably in the range of 0 <α <45 °. When the angle is 45 ° or more, the driver feels dazzling.

  Next, a fifth embodiment is shown in FIG. 9, and the angle of the light projecting direction in which the light 22 is projected from the light projecting unit 21 is changed at a constant period corresponding to the traveling direction F of the vehicle A. As a result, the brightness and position of the column 22a of the light 22 viewed from the driver change, and thus visibility can be improved. In addition, since the light 22 can repeatedly move along the boundary 30 between the roadway 28 and the road shoulder 29 and illuminates a wide range of the boundary 30, the boundary 30 can be easily seen.

  Next, FIG. 10 and FIG. 11 show a sixth embodiment, in which the light 22 projected from the light projecting unit 21 is an elliptical example. The shape of the lens 17 of the light projecting unit 21 of the road guidance display device 11 makes the light 22 from the lamp 14 be an ellipse on the irradiation surface. For example, light 22 having such an irradiation shape can be obtained by a lens 17 having a shape like a rotating body obtained by rotating a kamaboko shape around the lamp 14. In the case of this embodiment, irradiation is performed so that the major axis is arranged along the direction of travel F of the road 17 and the minor axis is arranged in the cross section of the road shoulder 29 portion. With this configuration, the pillar 22a of the light 22 seen from the driver looks like a curtain along the shoulder 29 of the road 27, so that the boundary 30 of the road 27 can be spatially recognized.

  Next, FIG. 12 shows a seventh embodiment, in which a road guidance display device 11 is embedded in the road surface 27a of the road 27 corresponding to the position of the boundary 30, and the light 22 is directed upward from the road surface 27a of the road 27. Light up. In this case, the snow accumulated on the protective plate 20 of the projection opening 12 of the road guidance display device 11 due to the heat generated by the lamp 14 can be melted to maintain the light projection amount of the light 22, and the road guidance display device 11 can be Since the installation columns 31 and the like are not erected, the landscape can be maintained, and further, since the road guidance display device 11 is located at a low position, maintenance can be facilitated.

  The road guidance display device 11 may be arranged in a guard rail column installed on the road shoulder 29 in addition to being embedded in the road surface 27a of the road 27.

  Next, FIG. 13 shows an eighth embodiment in which the road guidance display device 11 is used for guidance display of a railroad crossing or a signal stop, and a column 41 is erected on one side of the road 27. A road guidance display device 11 that projects light 22 toward the other side of the road 27 is installed sideways, that is, the light projection opening 12 faces the other side of the road 27, and the road 27 is disposed on the other side of the road 27. A light receiving unit 42 is provided to receive the light 22 projected from the guidance display device 11.

  Thus, since the pillar 22a of the light 22 projected from the road guidance display device 11 crosses the road 27 in the horizontal direction, it can be guided and displayed as a position of a railroad crossing or a signal stop.

  Next, FIG. 14 and FIG. 15 show a ninth embodiment, in which a normal lighting fixture 52 and a road guidance display device 11 are integrally provided as the lighting device 51, and the embodiment shown in FIG. It attaches to the support | pillar 31 standingly arranged by the shoulder 29 of the road 27 like this.

  The lighting fixture 52 includes a fixture main body 53. A mounting portion 54 to be attached to the column 31 is formed on the proximal end side of the fixture main body 53, and the road 28 of the road 27 is mainly illuminated inside the distal end side of the fixture main body 53. A lighting device 52 is disposed, and a road guidance display device 11 that projects light 22 on a boundary 30 between a roadway 28 and a shoulder 29 of a road 27 is disposed inside a proximal end side of the device body 53.

  The luminaire 52 is provided with a lamp 56 such as a metal halide lamp, a reflecting mirror 57 that reflects the light of the lamp 56 toward the road 27 below, and a strengthening process (including heat treatment) attached to the lower surface opening 53a of the fixture body 53. A glass cover 58 is provided.

  The road guidance display device 11 is disposed in the appliance main body 53 with the projection opening 12 facing the lower surface opening 53b of the appliance main body 53. Since the fixture body 53 is thin in the vertical direction, the light projecting unit 21 having the optical system 18 and the ballast 19 are separated, and the ballast 19 is disposed in a space beside the light projecting unit 21.

  Lighting of the lighting fixture 52 and the road guidance display device 11 is controlled by the lighting control unit 59. The lighting control unit 59 has a function of switching lighting of the lighting fixture 52 and the road guidance display device 11 in accordance with detection by the lighting environment detection device 60 that detects an environment such as ambient brightness and weather. For example, when it is not in bad weather such as snow, rain, fog, etc., if the surroundings become dark, the lighting fixture 52 is turned on, the road guidance display device 11 is not turned on, and in bad weather such as snow, rain, fog, etc. The guidance display device 11 is turned on, and the lighting fixture 52 is turned off. That is, when one of the lighting fixture 52 and the road guidance display device 11 is lit, the other is not lit.

  The lighting environment detection device 60 detects ambient brightness with an illuminance meter and a luminance meter arranged in the fixture main body 53, and the amount of snowfall, rainfall, and fog with an atmospheric transmittance meter arranged outside the fixture main body 53 Detects the density of the image.

  Then, when the surroundings are dark except during bad weather such as snowfall, rain, and fog, the road 27 is illuminated by turning on only the lighting fixture 52.

  Also, during bad weather such as snowfall, rain, fog, etc., only the road guidance display device 11 is turned on, so that the road 28 and the shoulder 29 are connected by the pillar 22a of one light 22 from the road guidance display device 11 to the road surface 27a. The boundary 30 is displayed as a guide. At this time, since the normal lighting fixture 52 is turned off, a light curtain that only illuminates, for example, snow during snowfall in the area below the lighting fixture 52 is generated like when the lighting fixture 52 is turned on in bad weather Or generation of reduced glare.

  As described above, since the lighting device 52 that illuminates the road surface 27a and the road guidance display device 11 that projects light toward the road surface 27a are provided, the single lighting device 51 can be used for normal road lighting and bad weather. It can be used by switching between the guidance display.

  For example, by switching between lighting of the lighting fixture 52 and lighting of the road guidance display device 11 according to the environment such as ambient brightness and weather, a single lighting device 51 can perform normal road lighting and guidance display in bad weather, etc. Can be used by switching appropriately.

It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 1st Embodiment of this invention. It is a block diagram of a road guidance display apparatus same as the above. It is explanatory drawing of the use condition which installed the road guidance display apparatus same as the above on the road at predetermined intervals. It is a graph which shows the light distribution of a road guidance display apparatus same as the above. It is explanatory drawing which shows 90 degrees of vertical angles and 80 degrees of vertical angles of a road guidance display apparatus same as the above. It is a perspective view of the arrow feather used together with the road guidance display apparatus which shows the 2nd Embodiment of this invention. The road guidance display apparatus which shows the 3rd Embodiment of this invention is shown, (a) is a front view, (b) is a side view, (c) is a bottom view, (d) is a rear view of arrow feathers. . It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 4th Embodiment of this invention. It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 5th Embodiment of this invention. It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 6th Embodiment of this invention. It is explanatory drawing of the planar view of the use condition of a road guidance display apparatus same as the above. It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 7th Embodiment of this invention. It is explanatory drawing of the use condition of the road guidance display apparatus which shows the 8th Embodiment of this invention. It is sectional drawing of the illuminating device provided with the road guidance display apparatus which shows the 9th Embodiment of this invention. It is a block diagram of a road guidance display apparatus same as the above.

Explanation of symbols

11 Road guidance display device
14 Lamp
18 Optical system as light control means
21 Projector
22 Light
27 road
27a road surface
51 Lighting equipment
52 Lighting equipment

Claims (7)

  What is claimed is: 1. A road guidance display apparatus comprising: a light projecting unit having a lamp and a light control means for controlling light of the lamp, and projecting light having a peak luminous intensity of 30000 cd or more from the light projecting unit on the road.   2. The road guidance display device according to claim 1, wherein the light beam projected from the light projecting unit has a 1/2 beam angle of 1 ° or less and a 1/10 beam angle of 2 ° or less.   2. The road guidance display device according to claim 1, wherein the shortest length of the light projected from the light projecting unit on the irradiation surface at 1/10 beam angle is 50 mm or more and 300 mm or less.   A light intensity value in a 90 ° vertical angle direction of light projected from the light projecting unit is 10 cd or less per 1000 lm of lamp light flux, and a light intensity value in a direction of 80 ° vertical angle is 30 cd or less per 1000 lm of lamp light beam. The road guidance display device according to any one of claims 1 to 3.   The road guidance display device according to any one of claims 1 to 4, wherein the light output of the lamp is changed in accordance with an environment. Lighting fixtures to illuminate the road surface;
A road guidance display device according to any one of claims 1 to 5, which projects light toward a road surface;
An illumination device comprising:   The lighting device according to claim 6, wherein lighting of the lighting fixture and lighting of the road guidance display device are switched in accordance with an environment.

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