JPH08284123A - Spontaneous emission type traffic button - Google Patents

Abstract

PURPOSE: To greatly reduce projection amount from a road surface while sufficiently ensuring visually recognizable distance in the horizontal direction. CONSTITUTION: A spontaneous emission type traffic button 10 has a case body 11 buried under a road surface, a transparent top plate 12 fitted while covering the upper opening 11a of the case body 11 and illuminants 13 mounted to the lower section of the transparent top plate 12 in an upper section in the case body 11, and the upper end of the case body 11 and the top face of the transparent top plate 12 are formed in approximately the same surface. The illuminant 13 is arranged separatedly with a distance W shown in the below stated formula from the outer circumferential surface of the transparent top plate 12 while its optical axis is directed towards the base of the transparent top plate 12, W>H.tanα, wherein H is the thickness of the transparent top plate and αthe critical angle of the transparent top plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is embedded in a road and emits light or blinks at night, etc.
The present invention relates to a self-luminous road tack that enables confirmation of positions of intersections, stop lines, lanes, and road shoulders.

[0002]

2. Description of the Related Art Conventionally, as a self-luminous road tack of this type,
For example, the structure shown in FIG. 11 is known. The self-luminous road tack indicated by reference numeral 1 in FIG. 11 is a case main body 2 which is buried under the road surface, a transparent top plate 3 which is attached so as to cover an upper opening of the case main body 2, and a lower surface of the transparent top plate 3. Along with the solar cell 4, a rechargeable storage battery 5 which is mounted in the case body 2 and charged by the solar cell 4, and the transparent top plate 3, A control unit that controls switching of charging and discharging of the storage battery 5 by the solar cells 4 and a plurality of light-emitting bodies 6 that are made to emit light by being supplied with drive power from the batteries, and controls supply of power to the light-emitting bodies 6. 7 and 7.

The conventional self-luminous road tack 1 having such a structure is buried under the road surface such as the above-mentioned intersections, stop lines, lanes, shoulders, etc., and by the action of the control unit 7, during the daytime, The solar cell 4 collects sunlight to generate power and charges the storage battery 5, and when the surroundings become dark at night or the like, the charged storage battery 5 energizes the light emitting body 6 to generate the light emitting body 6. By illuminating or flashing, the driver or pedestrian of the vehicle is made to recognize the position of the above-mentioned intersection, stop line, lane, or shoulder.

[0004]

However, the conventional self-luminous road tack 1 described above has the following problems to be improved. That is, self-luminous road tack 1
Then, since it is necessary to increase the visible distance,
I am trying to irradiate the light from the horizontal as much as possible,
Therefore, in the self-luminous road tack 1, the luminous body 6
The light projecting path of the transparent top plate 3 as shown by the arrow in FIG.
From the inside of the case through the outer surface of the transparent top plate 3 to the case body 2
The route is to the outside of. If an obstacle is present on the light emitting path of the light emitting body 6 as described above, its function is impaired. Therefore, in the conventional self-luminous road tack 1, the upper end of the case main body 2 is attached to the light emitting body. 6
The light-emitting body 6 located below the
Must be installed so as to be located above the road surface, and as a result, the self-luminous road tack 1 can be projected from the road surface as indicated by H in FIG.

Although the protruding height H depends on the shape of the light emitting body 6, when the light emitting body 6 which is normally used is used, it reaches several tens of millimeters, so that when the vehicle passes through. When the self-luminous road tack 1 and the tire collide with each other or the tire is re-grounded, a sound is generated, which is annoying especially at night when the noise is low.

On the other hand, such a problem can be solved by installing the self-luminous road tack 1 so that the upper end surface and the road surface are at the same height. In the light emitting type road tack 1, if the upper end surface is made to coincide with the road surface, the light projecting path of the light emitting body 6 is blocked by the ground or the case body 2, and the function of recognizing the position by light is impaired. Not applicable.

Further, when the upper end surface of the self-luminous road tack 1 and the road surface are at the same height, the light path of the light emitting body is set to a state close to the vertical, and the light is projected substantially above the self-luminous road tack 1. By doing so, it is possible to secure the function of recognizing the position. However, the visually recognizable distance in the horizontal direction is significantly shortened, which causes a problem that it cannot be recognized unless the user comes close to the shortest distance.

The present invention has been made in view of the above-mentioned conventional problems, and provides a self-luminous type road tack in which the amount of protrusion from the road surface is minimized while ensuring a sufficient visible distance in the horizontal direction. The purpose is to provide.

[0009]

In order to achieve the above-mentioned object, the self-luminous road tack according to claim 1 of the present invention comprises:
A case body embedded under the road surface, a transparent top plate provided to cover an upper opening of the case body, and a light-emitting body provided above the transparent top plate in the case body. In the self-luminous road tack, the upper end of the case body and the upper surface of the transparent top plate are substantially flush with each other, and the light-emitting body is expressed by the following formula from the outer peripheral surface of the transparent top plate. It is characterized in that they are arranged so as to be separated from each other by a distance W, and that their optical axes are directed toward the lower surface of the transparent top plate.

W> H · tan α where H is the thickness of the transparent top plate α is the critical angle of the transparent top plate, and the self-luminous road tack according to claim 2 of the present invention is
The luminous body in is located in an arcuate recess formed in the lower surface of the transparent top plate.

Further, in the self-luminous road tack according to claim 3 of the present invention, the case body according to claim 1 is provided with a storage battery for supplying drive power to the light emitting body, and the storage battery. It is characterized in that a solar cell for charging is provided.

Further, in the self-luminous road tack according to a fourth aspect of the present invention, the case body according to the first aspect is connected to a separately provided external power source for supplying driving power to the light emitter. It is characterized by

[0013]

According to the self-luminous road tack according to claim 1 of the present invention, the light emitted from the light-emitting body is once made incident on the transparent top plate, and at the time of incidence, the light having a predetermined refractive index is used. Is refracted and travels in the width direction within the transparent top plate, the transparent top plate emits light while passing through the transparent top plate, and then refracted from the upper surface of the transparent top plate based on a predetermined refractive index. Then, it is irradiated to the outside of the case body.

Here, since the light emitting body is separated from the outer peripheral surface of the transparent top plate by a distance determined by its critical angle and thickness, the light projecting path formed in the transparent top plate and the transparent top plate are formed. The light is guided to the upper surface of the transparent top plate by avoiding the intersection with the outer peripheral surface of the plate, and irradiation at the boundary of the upper surface of the transparent top plate at the critical angle can be performed. The light is emitted from the upper surface of the transparent top plate while avoiding the outer peripheral surface of the transparent top plate,
The light projection path of the light emitted to the outside is brought close to horizontal.

Therefore, even if the upper surface of the transparent top plate is made to coincide with the road surface, the light emitted from the light-emitting body is bent by the transparent top plate and is level from the upper surface of the transparent top plate without being disturbed by the case body. It is irradiated to the outside in a state close to
As a result, the light of the light emitting body reaches a long distance along the road surface, and in combination with the transparent top plate being made to emit light, a sufficient visible distance in the horizontal direction is secured, and the distance from the road surface is large. A self-luminous road tack with a reduced amount of protrusion can be obtained.

According to the self-luminous road tack according to the second aspect of the present invention, the luminous body is positioned in the arc-shaped concave portion formed on the lower surface of the transparent top plate, whereby the circular arc of the concave portion is formed. Due to the diffusing action of the light projecting path by the surface, the range of the light projecting path in the transparent top plate is widened, and the light irradiation area on the upper surface of the transparent top plate is expanded. by this,
The visibility is improved by enlarging the light emitting area of the transparent top plate itself.

Further, according to the self-luminous road tack according to the third aspect of the present invention, the luminous body emits light in response to the supply of electric power from the storage battery provided in the case body. And
When the environment around the installation place is bright, such as during the daytime, the solar cell collects energy from a light source such as the sun and charges the storage battery, so that electric power for driving the luminous body is secured. Therefore, the self-luminous road tack automatically operates by itself.

Further, according to the self-luminous road tack according to the fourth aspect of the present invention, the light emitting body is made to emit light by receiving the power supply from the external power source. Therefore, the solar cell can be installed in a place where energy collection from the surroundings is impossible.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. Reference numeral 10 in FIG. 1 denotes a self-luminous road tack according to the present embodiment. The self-luminous road tack 10 includes a case body 11 that is buried under a road surface R and an upper opening 11a of the case body 11. Transparent top plate 12 provided so as to cover
And the transparent top plate 12 at the upper part inside the case body 11.
And a top surface of the transparent top plate 12 are substantially flush with each other, and the top surface of the transparent top plate 12 is flush with the outer surface of the transparent top plate 12. , And the optical axis of the light-emitting body 13 is directed toward the lower surface of the transparent top plate 12, and the light-emitting body 13 has a schematic configuration.

Next, these details will be explained.
The case body 11 is made of a metal material or a synthetic resin material having excellent corrosion resistance and impact resistance, and has a substantially cylindrical shape with a bottom. The upper opening 11 a has an inner shape of the transparent top plate 12. The outer peripheral portion of the lower surface of the transparent top plate 12 is locked at a position having a depth h substantially equal to the thickness of the transparent plate 12 from the upper end surface of the locking step part. 11b is formed. Also,
At the bottom of the case body 11, a chargeable / dischargeable storage battery 14 similar to the conventional example is arranged.

The transparent top plate 12 is made of a transparent synthetic resin, glass or the like, and when mounted in the upper opening 11a of the case body 11, the lower surface outer peripheral portion of the case body 11 is engaged with the case body 11. By being brought into contact with the stop portion 11b, positioning with respect to the case body 11 is performed, and by being fixed to the case body 11 by appropriate fastening means, the upper opening 11a of the case body 11 is made liquid-tight. It is designed to be sealed.

Further, since the thickness of the transparent top plate 12 and the distance from the upper end of the case body 11 to the locking step 11b are matched, the transparent top plate 12 is fixed. In, the upper surface of the transparent top plate 12 is located substantially flush with the upper end surface of the case body 11.

On the other hand, in the present embodiment, the light emitting body 13 comprises a plurality of LEDs (Light Emitting D).
and a support member 15 disposed below the transparent top plate 12 and along a substantially central portion in the surface direction of the transparent top plate 12. It is distributed on both sides of.

When the thickness of the transparent top plate 12 is H and the critical angle at the interface with the air on the upper surface of the transparent top plate 12 is α, these luminous bodies 13 are set by the following equation. The optical axes thereof are directed to the outer peripheral surface of the transparent top plate 12 and to the lower surface of the transparent top plate 12 while being installed at positions separated by a certain distance W.

W> H · tan α = L Further, at a position between the light emitting body 13 and the inner peripheral surface of the case body 11 at a position avoiding the light projecting path D of the light emitting body 13,
A solar cell 16 is arranged to charge the storage battery 14 by generating power by receiving external light such as sunlight transmitted through the transparent top plate 12.

As shown in FIG. 1, the self-luminous road tack 10 of the present embodiment having the above-described structure has the upper surface of the case body 11 and the transparent top plate 12 and the road surface R aligned with each other.
It is buried under the road surface R.

In a bright environment such as daytime, light rays such as sunlight are transmitted through the transparent top plate 12 and applied to the solar cell 16, so that the solar cell 16 generates electric power. The storage battery 14 is charged.

When the surroundings become dark at night or the like, the electric power stored in the storage battery 14 is intermittently supplied to the light emitting bodies 13, so that these light emitting bodies 13 emit light intermittently. However, the optical axes of these light emitters 13 are directed toward the outer peripheral surface of the transparent top plate 12, and the transparent top plate 1
These luminous bodies 1 are directed to the lower surface of 2
Light emitted from the transparent top plate 12 enters the transparent top plate 12 from the lower surface of the transparent top plate 12 with a predetermined refractive index, and then the transparent top plate 1
It is irradiated from the upper surface of 2 to the outside with a predetermined refractive index.

Here, the incident angle at the boundary surface between the upper surface of the transparent top plate 12 and the outside of the light emitted from the light emitter 13 and entering from the lower surface of the transparent top plate 12 to the inside thereof is The light from the light-emitting body 13 with respect to the lower surface of the transparent top plate 12 is made to be an angle that is as close as possible to the angle of total reflection at the boundary surface, that is, the critical angle (refraction angle with respect to the incident angle to the transparent top plate 12) α. By setting the incident angle θ, the projection path D of the light emitted from the upper surface of the transparent top plate 12 to the outside is set to the minimum angle with respect to the horizontal plane.

Then, each of the light emitters 13 has W> H · t
Since it is installed at the position of the distance W defined by an α = L, the light projection path D of the light emitted from the upper surface of the transparent top plate 12 to the outside becomes the minimum angle with respect to the horizontal plane. Interference between the light projecting path D inside the transparent top plate 12 and the outer peripheral surface of the transparent top plate 12 when set is reliably prevented.

Therefore, as described above, the luminous body 13
The light radiated from the transparent top plate 12 is refracted by the transparent top plate 12, travels away from the outer peripheral surface of the transparent top plate 12, and then is surely radiated from the upper surface to the outside and is projected from the transparent top plate 12. Since the light path D is maintained in a state close to horizontal and the light is transmitted through the transparent top plate 12 while being inclined in the plane direction, the transparent top plate 12 itself emits light. A sufficient visible distance is secured.

Further, since the light projecting path D is performed from the upper surface of the transparent top plate 12 while avoiding the outer peripheral surface of the transparent top plate 12, the upper surface of the transparent top plate 12 is embedded in the upper surface of the case body 11 or embedded. Even when it is matched with the road surface R, the light irradiation from the transparent top plate 12 is not hindered.

As a result, the projection of the case body 11 and the transparent top plate 12 from the road surface R is suppressed, and the generation of noise due to the passage of a vehicle or the like is prevented.

FIG. 2 shows a second embodiment of the present invention.
The self-luminous road tack of this embodiment shown by reference numeral 20 in this figure is obtained by modifying the shape of the transparent top plate 12 and the mounting structure of the light emitting body 13 shown in the first embodiment. The configuration is similar to that of the first embodiment.

That is, the transparent top plate 21 used in the self-luminous road tack 20 shown in this embodiment has a concave portion 21a having an arcuate cross-sectional shape on the lower surface thereof, and the light emitting portion of the light emitting body 13 has these portions. It is configured to be positioned in the recess 21a.

With such a structure, when the light emitted from each of the light emitting bodies 13 enters the transparent top plate 21, the concave lens effect of the curved surface of the concave portion 21a causes
The light projecting path D in the transparent top plate 21 is radially expanded as shown by an arrow in FIG.
The area of the light traveling in 1 and the irradiation area of the light on the upper surface of the transparent top plate 21 are enlarged.

As a result, the degree of light emission of the transparent top plate 21 itself is increased and the external irradiation area is enlarged, so that the visibility is improved.

FIGS. 3 and 4 show a third embodiment of the present invention. The self-luminous road tack of this embodiment, which is designated by reference numeral 30 in these figures, has an upper portion as shown in FIG. An opened case body 31, a transparent top plate 32 provided so as to cover the opening of the case body 31, a plurality of light emitting bodies 33 arranged on the lower side of the transparent top plate 32, and the transparent body. Top plate 3
2, a solar cell 34 arranged along the lower surface of the battery 2, a storage battery 35 installed below the solar cell 34 and charged by the solar cell 34, charging of the storage battery 35 by the solar cell 34, A control unit 36 for controlling power supply to the light emitting body 33 by the storage battery 35, the light emitting body 33 having its optical axis directed to the inside of the case body 31 and directed to the transparent top plate 32. It has a schematic structure attached.

Next, these details will be explained.
In the present embodiment, the case body 31 is formed in a quadrangular planar shape, and the case main body 31 has an upper space portion 31a in which the transparent top plate 32 is housed, and a substantially central lower portion, the upper portion. A lower space portion 31b formed continuously with the space portion 31a and accommodating the solar cell 34, the storage battery 35, and the control unit 36, and the lower space portion 31b.
Side space portions 31c are formed along the lower space portion 31b and continuously with the upper space portion 31a, in which the light emitting bodies 33 are housed.

Further, at the bottom of the upper space 31a,
A step portion 31d on which the lower surface of the peripheral edge of the transparent top plate 32 is placed is formed over the entire circumference, and a groove 37 is formed over the entire circumference in the step portion 31d. An annular O-ring 38 is mounted inside.

The O-ring 38 has the transparent top plate 32 mounted in the upper space portion 31a, and the case body 31 is
By being elastically deformed by the transparent top plate 32 and the case main body 31 in a state of being fixed to, the both are closed in a liquid-tight state.

The transparent top plate 32 is made of transparent glass or transparent synthetic resin in a plane shape substantially the same as the upper opening of the case body 31, and its four corners are shown in FIG.
As shown in FIG. 5, a bolt insertion hole 39 into which a bolt for connecting to the case body 31 is mounted is formed, and the upper surface of the bolt insertion hole 39 is the upper surface of the case body 31 when mounted on the case body 31. Is formed to have a thickness that can be almost matched with.

In addition, at the position of the transparent top plate 32 opposed to the side space portion 31c, the side space portion 3 is formed.
A concave portion 32a having a substantially semi-arcuate cross-sectional shape and having a length substantially the same as that of 1c is formed.

The luminous body 13 has the side space portion 31c.
Inside the reflector 4 provided along the length direction
These light emitters 3 are attached through
3 is stored in the side space portion 31c,
As shown in FIG. 4, the optical axis of the luminous body 33 is held in an inclined state so that its optical axis faces the inside of the case body 31 and faces the transparent top plate 32. It is arranged so as to be located in a recess 32a formed in the transparent top plate 32.

The solar cell 34 is housed in a transparent solar case 41, and is installed in the case body 31 so as to close the upper part of the lower space 31b thereof, and the light receiving surface side thereof is the above-mentioned. The transparent top plate 32 is located at a position close to the inner surface thereof.

The distance between the solar case 41 and the transparent top plate 32 is such that when a load is applied to the transparent top plate 32 and the transparent top plate 32 is bent, the transparent top plate 32 is bent by the bending.
Is set to such an extent that it can be prevented from contacting the solar case 41.

The storage battery 35 is a chargeable / dischargeable storage battery, and the light emitting unit 3 is connected via the control unit 36.
3 and the solar cell 34 are electrically connected.

Further, in the present embodiment, the control unit 36 detects the brightness of the surroundings where the road tack 30 is installed, and connects the storage battery 35 and the solar battery 34 in accordance with the brightness. Switching between the charging operation to the storage battery 35 by performing the operation and the energization operation to the light emitting body 33 by disconnecting the storage battery 35 and the solar cell 34 and connecting the storage battery 35 and the light emitting body 33. In addition to controlling, the energization time and the energization interval to the light emitting body 33 are controlled.

The energization time and energization interval are
It is set in consideration of the afterimage effect after light emission of the light emitter 33, and by performing such blinking light emission,
As compared with continuous light emission, the effect of calling attention is enhanced, the amount of power used is reduced, and the durability of the light emitting body 33 is enhanced.

The road tack 3 of the present embodiment constructed as described above
As shown in FIG. 4, 0 is embedded so that the upper surfaces of the case body 31 and the transparent top plate 32 are substantially flush with the road surface R.

Then, for example, when it is not necessary to emit light in the daytime, the storage battery 35 is charged by the solar cell 34 by the action of the control unit 36,
Further, when it becomes necessary to emit light at night or the like, the electric power stored in the storage battery 35 is supplied to the light emitting body 33 in a predetermined form, so that the light emitting operation is performed.

When such a light emitting operation is started, most of the light emitted from the light emitting body 33 is emitted from the transparent top plate 32 as shown by arrows (a) and (b) in FIG. Recess 3
This transparent top plate 3 enters the transparent top plate 32 from the inner surface of 2a.
After traveling in the width direction in 2, the irradiation is performed along the road surface R from the upper surface of the transparent top plate 32.

Here, when the light is passed through the transparent top plate 32 in the width direction, the transparent top plate 32 is caused to emit light almost entirely, thereby improving the visibility. Further, the light that has entered the transparent top plate 32 is guided obliquely upward in the transparent top plate 32, and most of it is
The light is emitted from the surface of the transparent top plate 32, and the light path is formed obliquely upward so that the light is transmitted through the side wall of the case main body 32 located at the outer peripheral edge of the transparent top plate 32. Avoid it and irradiate it to the outside.

Therefore, as described above, the road tack 30
Even when the upper end surface of the vehicle is installed so as to match the road surface R, light is emitted in the horizontal direction, thereby ensuring a sufficient visible distance in the horizontal direction and at the same height as the road surface R. By installing the vehicle in such a manner, collision with the tie of the vehicle and riding on the tie are eliminated, and noise when the vehicle passes is reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
And it demonstrates based on FIG.

5 and 6, the road tack of this embodiment, which is designated by the reference numeral 50, is the same as the third embodiment except that the luminous bodies 33 arranged in a line on one side of the case body 31 are connected to the solar cells 35. They are provided on both sides of the sandwich, and the optical axes of the light-emitting bodies 33 in each row are directed toward the inside of the case body 31 and toward the lower surface of the transparent top plate 32, and on the upper surface of the case body 31, the walls thereof are provided. A plurality of spherical shell-shaped projections 51 are provided at predetermined intervals along the direction, and a plurality of ridges 52 parallel to the arrangement direction of the light emitting bodies 33 are provided on the upper surface of the transparent top plate 32. The other features are almost the same as those of the third embodiment.

As described above, by providing the light-emitting bodies 33 in two rows, the visibility obtained in the third embodiment can be secured in the two directions of the case body 31. Also,
By providing the projection 51 on the upper surface of the case body 31 and by providing the plurality of protrusions 52 on the upper surface of the transparent top plate 32,
Slip on the upper surface of the road tack 30 is suppressed.

Furthermore, the plurality of ridges 52 provided on the transparent top plate 32 change the condensing state and the refraction direction of the light emitted from the transparent top plate 32 to the outside, whereby the transparent top plate 32 is changed. The light emission state of is partially changed,
This further enhances the visibility.

Further, FIG. 7 shows the fifth embodiment of the present invention.
And it demonstrates based on FIG. The road tack of the present embodiment is a plurality (30a to 3a) of the road tack 30 shown in the third embodiment.
0c) are electrically connected to each other so that one road tack 30a operates in synchronization with each other.

That is, each road tack 30a-30
In c, as shown in FIG.
4, the storage battery 35 is provided, the main road tack 30
In a, a charge command signal for charging the storage battery 35 to the other subordinate road tacks 30b and 30c and the main road tack 30a itself, and a power supply command signal for causing the light emitting body 33 to emit light. A central control unit 53 for outputting is provided, and in the other subordinate road tacks 30b and 30c, based on a command signal from the central control unit 53, the individual storage batteries 35 are sent to the light emitter 33 and the solar cell 34. A switching circuit 54 for switching connection is provided, the central control unit 53 and the switching circuit 54 are connected by a signal line 55, and each storage battery 35 is connected in parallel by a pair of power supply lines 56.

Then, the ambient brightness is continuously detected on the main road tack 30a, and the power supply signal is output from the central control unit 53 at the time when the light emission becomes the required darkness. The light-emitting bodies 33 of the road tacks 30a to 30c are simultaneously made to emit light and blink. In addition, each solar cell 34 is connected to the storage battery 35 in the same manner when the battery is in a chargeable state.

The road tacks 30a to 30 of the present embodiment as described above.
c is preferably used when, for example, a linear position display such as a stop line is performed.

The shapes, sizes, etc. of the constituent members shown in each of the above embodiments are merely examples, and can be variously changed according to the place where the road tack is installed, the purpose of installation, the design requirements, and the like.

For example, in the above-described embodiment, the case body 31 has a rectangular planar shape, the attached light-emitting bodies 33 are provided linearly along the sides of the case body 31, and the light irradiation direction is set to the case body. Although an example of one direction or two directions of 31 is shown, instead of this, FIG.
And, like the road tack indicated by reference numeral 60 in FIG. 10, the planar shape of the case body 61 is circular, the plurality of light emitting bodies 33 are arranged at equal intervals in the circumferential direction, and the optical axis direction of each of these light emitting bodies is changed. The case main body 61 may be installed toward the center and the transparent top plate 62.

With such a structure, good confirmation can be made from all the circumferences of the road tack 60.

Further, in each of the above-described embodiments, an example in which the upper surface of the transparent top plate 12, 32, 62 has a substantially flat shape as a whole is shown. However, the central portion is swelled in a kamaboko shape, a gable shape, It is possible to have a spherical shell shape or a shape that is inclined in one direction as a whole.
Recesses 21a and 32 formed in the transparent top plates 21 and 32
Although an example in which a is formed into a semicylindrical shape is shown, instead of this, as shown in FIGS. 9 and 10, a spherical shell-shaped concave portion 62 is used.
It can be a.

Further, an example in which the solar cell 34, the storage battery 35 and the control unit 36 are used to operate independently has been shown, but the driving power may be supplied from an external power source such as a daily power source. . With such a configuration, the power source for driving the light emitter is reliably secured, and there is no restriction on the installation place.

[0068]

As described above, according to the first aspect of the present invention.
According to the automatic light emitting type road tack, the light emitted from the light emitting body is once incident on the transparent top plate, and
At the time of incidence, it is refracted based on a predetermined refractive index and advances in the width direction within the transparent top plate, and the transparent top plate emits light while passing through this transparent top plate, and then from the upper surface of the transparent top plate. The light is refracted based on a predetermined refractive index and is irradiated to the outside of the case body.

Here, since the luminous body is separated from the outer peripheral surface of the transparent top plate by a distance determined by its critical angle and thickness, the light projecting path formed in the transparent top plate and the transparent top plate are formed. The light is guided to the upper surface of the transparent top plate by avoiding the intersection with the outer peripheral surface of the plate, and irradiation at the boundary of the upper surface of the transparent top plate at the critical angle can be performed. The emitted light is emitted to the outside from the upper surface of the transparent top plate while avoiding the outer peripheral surface thereof, and the projection path of the light emitted to the outside is brought close to horizontal.

Therefore, even if the upper surface of the transparent top plate is made to coincide with the road surface, the light emitted from the light-emitting body is bent by the transparent top plate and is level from the upper surface of the transparent top plate without being disturbed by the case body. It is irradiated to the outside in a state close to
As a result, the light of the light emitter reaches a long distance along the road surface, and the transparent top plate is caused to emit light, so that the visible distance in the horizontal direction is sufficiently secured, and the amount of protrusion from the road surface. It is possible to obtain a self-luminous road tack with suppressed light emission.

According to the self-luminous road tack according to the second aspect of the present invention, by locating the luminous body in the arc-shaped concave portion formed on the transparent top plate, the projection path by the circular arc surface of the concave portion is formed. By the diffusion effect of the, the range of the light projecting path in the transparent top plate is widened, and the light irradiation area on the upper surface of the transparent top plate is expanded, thereby expanding the light emission area of the transparent top plate itself. Thereby, the visibility can be improved.

Further, according to the self-luminous road tack according to claim 3 of the present invention, the luminous body is caused to emit light by supplying electric power from the storage battery provided in the case body, and is installed during the daytime. When the surroundings of the place are bright, the solar cell collects the energy of the surrounding light sources to charge the storage battery, whereby the electric power for driving the luminous body can be automatically secured. Therefore, the self-luminous road tack can be automatically driven by itself.

Further, according to the self-luminous road tack according to the fourth aspect of the present invention, it is impossible to collect energy from the surroundings by the solar cell by causing the luminous body to emit light by the electric power supplied from the external power source. It can be installed even in places.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a third embodiment of the present invention.

FIG. 4 is a vertical sectional view showing a third embodiment of the present invention.

FIG. 5 is a plan view showing a fourth embodiment of the present invention.

FIG. 6 is a vertical sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a plan view showing a fifth embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a fifth embodiment of the present invention.

FIG. 9 is a plan view showing a modified example of the present invention.

FIG. 10 is a vertical sectional view showing a modified example of the present invention.

FIG. 11 is a vertical cross-sectional view showing one structural example of a conventional self-luminous road tack.

[Explanation of symbols]

 10.20.30.50.60 (Self-luminous type) Road tack 11.31.61 Case body 11a.31a Upper opening 12.21.32.62 Transparent top plate 21a.32a.62a Recess 13.33 Luminescent body 16・ 34 Solar battery 14 ・ 35 Storage battery 36 Control unit 51 Projection 52 Projection 53 Central control unit 54 Switching circuit 55 Signal line 56 Electric wire

Claims (4)

[Claims] 1. A case body embedded under the road surface, and a transparent top plate provided to cover an upper opening of the case body,
A self-luminous road tack having an illuminant provided below the transparent top plate in an upper part of the case main body, wherein an upper end of the case main body and an upper surface of the transparent top plate are substantially flush with each other. The light-emitting body is arranged so as to be separated from the outer peripheral surface of the transparent top plate by a distance W represented by the following formula, and its optical axis is set to face the lower surface of the transparent top plate. A self-luminous road tack that is characterized by being. W> H · tan α where H: thickness of transparent top α: critical angle of transparent top 2. The self-luminous road tack according to claim 1, wherein the luminous body is positioned in an arcuate recess formed in the lower surface of the transparent top plate. 3. The case body is provided with a storage battery that supplies drive power to the light-emitting body, and a solar cell that charges the storage battery. Self-luminous road tack as described. 4. The self-luminous road tack according to claim 1, wherein an external power source, which is separately provided to supply driving power to the luminous body, is connected to the case body.