WO2006106789A1

WO2006106789A1 - Self-luminescence traffic sign

Info

Publication number: WO2006106789A1
Application number: PCT/JP2006/306587
Authority: WO
Inventors: Isamu Hayakawa
Original assignee: Izm Co., Ltd
Priority date: 2005-03-30
Filing date: 2006-03-30
Publication date: 2006-10-12
Also published as: JP3851649B2; JP2006274685A

Abstract

A self-luminescence line-of-sight conducting sign which uses a thin structure to prevent snow from falling thick, can be always lighted at night time, and gives a frozen-road warning by changing the color of an LED emission at freezing. A self-luminescence traffic sign comprising a solar cell, an electric double-layer capacitor, and a circuit consisting of an LED, wherein the circuit is housed in a thin, disc-form case up to 20 mm thick, and the solar cell and the LED are disposed concentrically on the flat surface of the disc-form case with the solar cell at the center and the LED at the periphery. The case is glass-coated and coated with TiO2. In the circuit, a power supply output is discharge via a high resistance to an NAND logic charge/discharge circuit including the LED to enable always-lit-up at night time with a feeble current. The LED emission is stopped upon detecting a headlight at night time. A thermistor is provided on the input side of an LED blinking circuit to automatically change the color indication of the LED when the road temperature falls down to a freezing temperature.

Description

Light-emitting road sign

Technical field

The present invention relates to a self-luminous road sign that does not require maintenance, and more particularly to a self-luminous gaze guidance sign.

Background art

[0002] Conventional self-luminous line-of-sight guides that are arranged alongside guardrails and the like on the roadside are, as shown in, for example, Japanese Patent Laid-Open Nos. 1-237853 and 8-27737, In most cases, solar cells are installed in the direction (direction) and LEDs are lit in the side direction (horizontal direction).

[0003] In this case, since the area of the solar cell on the upper surface is required, the thickness in the horizontal direction becomes large. In a snowy area, snow falls on this part, and the snow covers the LED light emitting surface and passes through. It's easy to have a flaw.

[0004] In addition, since the amount of power generated by a solar cell is particularly small during snowfall or cloudy weather, a self-luminous gaze guidance mark is used in a snowy area as shown in JP-A-10-289394 for power saving. It is known that the headlight is detected only when approaching and emits light. However, this configuration has a drawback that the LED light emission of the line-of-sight guide cannot be seen from a distance, and the LED is dazzled when approaching, but the above-mentioned known example does not consider this.

Japanese Patent Laid-Open No. 14-256520 discloses that a temperature sensor is provided on a roadside to change the color of light emission display at a predetermined temperature in order to notify the danger of an accident due to freezing in winter. However, in order to display the road surface temperature on the line-of-sight indicator, wiring from the road surface to the indicator is required.

Patent Document 1: Japanese Patent Laid-Open No. 11-237853

Patent Document 2: JP-A-8-27737

Patent Document 3: Japanese Patent Laid-Open No. 10-289394

Patent Document 4: Japanese Patent Laid-Open No. 14-256520 Disclosure of the invention

Problems to be solved by the invention

[0006] The present invention improves the drawbacks of the above-mentioned conventional gaze guidance mark, adopts a structure that is thin and does not accumulate snow, makes the current consumption very small, enables continuous flashing at night, and further increases the density. The purpose is to provide a self-luminous gaze guidance sign that incorporates a temperature sensor in a sealed enclosure and changes the color of the LED light when frozen to display a road freezing warning to the driver.

Means for solving the problem

[0007] In order to solve the above-described problem, the self-luminous road sign of the present invention is a self-luminous road sign having a circuit comprising a solar cell, an electric double layer capacitor, and an LED, and the circuit is thin with a thickness of 20 mm or less. The solar cell and the LED are arranged in a disk-like housing plane, and the solar cell is arranged in the center and the LED is concentrically arranged in the periphery in the disc-like housing plane. .

[0008] Further, the thickness of the casing is 14 mm, the diameter is 70-: LOOmm, and the casing is coated with a glass coating and Ti02.

In addition, the self-luminous road sign of the present invention includes the solar cell, the electric double layer capacitor, and the LED power in the circuit including the LED and the power output of the solar cell and the electric double layer capacitor through the high resistance. It is possible to always flash at night by controlling the timing of the flashing light emission of the LED only by charging and discharging the LED flashing circuit by the weak current via the high resistance and discharging to the NAND logic charging / discharging circuit. .

[0009] Alternatively, in the circuit including the solar cell, the electric double layer capacitor, and the LED power, the generated voltage of the solar cell is monitored, and the approach of the headlight at night is detected by the generated voltage to stop the LED emission. It is characterized by doing.

In the circuit composed of the solar cell, electric double layer capacitor, and LED, a thermistor is provided on the input side of the LED blinking circuit, and the color display of the LED is automatically changed when the road reaches the freezing temperature. And Furthermore, the color display is characterized by three colors of white, green and red depending on the temperature range.

In particular, the road sign is a visual guidance mark. The invention's effect

[0010] Since the road sign of the present invention uses a thin disk-shaped casing in the vertical direction, it is possible to prevent snow accumulation, and even if it is used in a heavy snowy area, the sign does not accumulate and the display cannot be seen.

Further, since the casing is coated with a glass coating and Ti02, it does not become cloudy and is difficult to get dirty.

The self-luminous road sign of the present invention is a charge / discharge circuit including a LED with a power output composed of the solar cell and the electric double layer capacitor via a high resistance in the circuit consisting of the solar cell, the electric double layer capacitor and the LED power. The timing of the LED flashing emission is controlled only by charging and discharging the LED flashing circuit due to the weak current via the high resistance. It is possible to always flash at night without taking measures such as turning on only to save power.

[0011] Also, by monitoring the power generation voltage of the solar cell, detecting the headlight at night and stopping the LED emission, the driver's dazzling is prevented, and the driver's visual environment and safety are not impaired. To do.

In addition, by installing a thermistor on the input side of the LED flashing circuit and automatically changing the color display of the LED when the road reaches the freezing temperature, a warning of road freezing can be issued to the driver.

Brief Description of Drawings

[0012] FIG. 1 is an overview of a gaze guidance mark according to the present invention.

FIG. 2 is a diagram showing an LED light emission control circuit of a line-of-sight guide according to the present invention.

FIG. 3 is an explanatory diagram of an IC circuit.

Explanation of symbols

[0013] 1 LED

2 Solar cell

3 High brightness reflective sheet

10 Charging circuit

11 Lighting circuit

12 High resistance 13 Generation voltage monitoring circuit 1

14 Temperature monitoring switching circuit

21 Solar cell

23 Electric double layer capacitor

24 thermistor

33 LED

34 LED

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail based on examples with reference to the drawings.

Example

[0015] FIG. 1 shows an overview diagram of the gaze guidance mark of the present invention. In FIG. 1 (a), 1 is a light emitting diode (LED), 2 is a solar cell, and 3 is a high brightness reflective sheet. Fig. 1 (b) shows a side view of Fig. 1 (a), in which LED1 and solar cell 2 are housed in the back cover and circuit, and front cover 4 is attached. The line-of-sight guide in Fig. 1 can be used as it is, alone or on a post on a road, or pasted on a conventional non-luminous reflective display panel. Since the solar cells are oriented horizontally when installed, and there are no solar cells on the ceiling as in the conventional gaze guidance mark, there is almost no snow on this part, which has a small ceiling area. The horizontal thickness of the example is 14 mm, and 20 mm or less is recommended.

[0016] The casing is coated with a glass film and is coated with Ti02. Specifically, the enclosure is made of environmentally friendly plastic, dubbed into a glass coating solution, and finally sprayed with a Ti02 solution. Glass coating has a thickness of about 10 m and is effective in preventing the accumulation of snow by smoothing the housing surface. In addition, due to the photocatalytic action of Ti02, dirt on the surface of the casing rises and is removed, eliminating the need to clean the casing. Furthermore, the glass coating prevents the plastic from becoming clouded and prolongs the lifetime of the display.

FIG. 2 shows a light emission control circuit of the LED. The circuit comprises a charging circuit 10, a lighting circuit 11, a generated voltage monitoring circuit 13, and a temperature monitoring switching circuit 14.

In the charging circuit 10, the voltage generated from the solar cell 21 passes through the voltage limiting circuit 22. The electric double layer capacitor 23 is charged. The voltage limiting circuit 22 is a protective circuit that protects the electric double layer capacitor by adjusting the charging voltage to 6 V or lower when the voltage is 6 V or higher.

The output of the electric double layer capacitor 23 is input to the generated voltage monitoring circuit 13. The generated voltage monitoring circuit 13 is provided with a current limiting high resistance 12 so that the current flowing in the nighttime LED is limited to a very small current and can be blinked at night by the electric power of the electric double layer capacitor charged in the daytime. The current is limited to the above. Electric double layer capacitors can normally be charged in about 7 minutes. In this circuit, when the vehicle approaches, the generated voltage (electromotive force) of the solar cell 21 by the headlight of the vehicle is monitored by the generated voltage monitoring circuit 13, and when the generated voltage exceeds a predetermined value, the LED is connected to the LED. Stop power supply.

[0019] The reason for this is as follows.

The gaze guidance mark of the present invention is premised on the combined use with a conventional reflective gaze guidance mark. The reflective guidance sign is close to 30m and the force 4 cannot be seen. On the other hand, the self-luminous guidance mark can visually recognize a distance force of 300 m. Therefore, it is difficult for the driver to visually recognize it during snowfall. In many cases, it is desirable to install a self-luminous guidance sign in heavy snow areas in Hokkaido and Tohoku.

[0020] On the other hand, the self-luminous guidance sign is required to increase the brightness so that it can be visually recognized from a distance. If the brightness is increased, the driver will be more dazzled when approaching the vehicle. Often becomes. The self-luminous gaze guidance mark has been confirmed to change the driver's gaze behavior according to the light emission intensity. When the light emission intensity is low, the gaze is not effectively guided, while when the luminance is high, the light-emitting gaze guidance mark is self-luminous. The gaze guidance mark cannot be seen directly. In particular, in the case of a line-of-sight guide, the LED emission angle is 8 to 15 °. In the case of a self-luminous gaze guidance target that uses multiple LEDs, even if it is a product that selects a flashing light emitting method, it is considered to have the same risk as a `` laser pointer '' sold at a toy store. In addition, excessive light emission from the gaze guidance mark may damage the driver's visual environment.

[0021] Therefore, when the vehicle approaches the line-of-sight guide, the driver can fully see the line-of-sight guide by the reflection type line-of-sight display part. In order to avoid this, the LED of the self-luminous line-of-sight guidance indicator is stopped. In addition, this makes it possible to increase the luminance of the emitted light and to make it possible to visually recognize more distant force.

The output of the generated voltage monitoring circuit 13 is input to the temperature monitoring NAND logic circuit 14.

The temperature monitoring switch circuit 14 is provided with a thermistor 24. The thermistor 24 provided in the line-of-sight guidance housing shown in FIG. 1 detects the outside air temperature, and sends a voltage change signal to the logic circuit composed of ICs 30 and 31 when the outside air temperature is such that the road freezes. The NAND circuit 14 is activated to change the LED emission color and issue a road freeze warning to the driver. ICs 30 and 31 are ICs for this color change. Reference numeral 26 denotes a bridge circuit, and the LED 33 or LED 34 is caused to blink by the capacitor 27 or the capacitor 28 being repeatedly charged and discharged by a minute current from the generated voltage monitoring circuit by the bridge output of the temperature setting variable resistor 25 and the thermistor 24. The LEDs 33 and 34 have different colors such as red and green, for example. In Figure 2, there are two types of color development, but it is preferable to display in three colors, such as white at 5 ° C or higher, green at 0-5 ° C, red at 0 ° C or lower! / ,.

The role of each component in the circuit diagram of FIG. 2 is as follows.

TR1: Overcharge prevention SW

TD1: For charging voltage determination (overcharge prevention voltage determination)

TR2.TR3: Darlington connection · LED light-emitting driver

TR4.TR5: Darlington connection LED driver

TR6: Total circuit power supply SW (Solar cell operating voltage monitoring circuit)

R1: Flashing circuit power supply restriction

R2.C1.R3.C2: Capacitor charging time delay (C1.C2)

R4.R5: Adjustment of capacitor discharge time (light emission time adjustment)

R6.7: Power supply voltage determination

R8.R9: Current limit to temperature monitoring circuit

R10-.R13: Temperature monitoring decision unit (current limit)

C4.C5: For adjusting the operating time according to IC characteristics

PD1: Backflow prevention (The size changes depending on the solar cell power generation capacity) CPD: Diode bridge (single unit possible)

The circuit of the IC (74HC132) used in FIG. 2 is shown in FIG.

In this circuit, for example, 1 · 2 · 3ΡΙΝ of the IC is a set of NAND circuits, 1 · 2 番 IN is NAND input, and No.3 is NAND output.

Therefore, the combinations are shown in the following table.

[0025] PIN number

Signal

[0026] The NAND circuit is provided with four NAND circuits, and the relationship of other PINs is also as shown in Fig. 3. Note that in the above RIO '".R13: temperature monitoring determination unit (current limiter), And

In general, other temperature sensing is voltage monitoring, but this circuit section monitors the current value! / The temperature set value can be changed by the current value. The charging time is determined by C27 and C28. (The flashing time can be determined. However, the same capacity is required.)

The detailed circuit operation of FIG. 2 is as follows.

When nighttime solar cell power generation stops, monitoring circuit TR6 is turned off, power is supplied to IC30 and 31, and the temperature monitoring circuit is turned on. Pin 2 of IC30 is turned ON, and pins 3 and 6 are turned ON by the NAND circuit, and temperature sensor circuit 14 is turned ON. Depending on the set temperature, pass through the diode bridge and turn on the IC31 PIN1 or PIN5. By turning the IC31 Pins 8 and 11 ON / OFF by combining the FF circuit of the IC31, the lighting circuit 11 is flashed and the LED blinks. The blinking timing is the operating time of the FF circuit of IC31 Is determined by the capacity of C27 and 28. Even if the temperature sensor is not energized, the resistance value changes depending on the outside air temperature.

[0028] Although the above embodiment relates to a visual guidance mark, the present invention is not limited to the visual guidance mark, and can be applied to other road signs such as a road position display board and a guidance board. In this case, not only a circular shape but also a square display board may be used.

Industrial applicability

[0029] The road sign of the present invention uses solar cells and LEDs, and is operated with a weak current. Therefore, the road sign can be constantly flashed at night, does not require maintenance after installation, and has a long life. Even when the snow is gentle, it is possible to avoid the invisible state due to snow and to display road icing at the same time.

Furthermore, the road sign of the present invention is highly useful because it prevents the driver from being dazzled when the vehicle is close to the vehicle and impairs the driver's visual environment and safety.

Claims

The scope of the claims

[1] In a self-luminous line-of-sight guidance sign that is placed along a roadside guardrail, etc., and has a solar cell, electric double layer capacitor, and LED power

The circuit is housed in a thin disk-shaped housing having a thickness of 20 mm or less, and the solar cell, the LED, and the high-intensity reflective sheet are in the plane of the disk-shaped housing, and the solar cell is in the center of the LED and the high-intensity reflective sheet. A self-luminous line-of-sight guidance sign that is concentrically arranged around the periphery, and that the housing plane is installed on the side of the road in a horizontal direction so that the LED can be seen from a distance at night.

[2] The self-luminous gaze guidance mark according to claim 1, wherein the casing has a thickness of 14 mm and a diameter of 70 to LOOmm.

[3] The self-luminous gaze guidance mark according to claim 1 or 2, wherein the casing is covered with a glass coating and Ti02 coating.

[4] In the circuit consisting of the solar cell, the electric double layer capacitor, and the LED power, the power output that also has the power of the solar cell and the electric double layer capacitor is discharged to a charge / discharge circuit including the LED through a high resistance for current limiting, 3. The self-light-emitting device according to claim 1 or 2, wherein the light-emitting device can always be turned on at night by controlling the timing of the LED flashing light emission only by charging and discharging the LED flashing circuit with a weak current through a high resistance. Type gaze guidance mark.

[5] In the circuit including the solar cell, the electric double layer capacitor, and the LED power, monitor the generated voltage of the solar cell, detect the approach of the headlight at night by the generated voltage, and stop the LED emission. The self-luminous gaze guidance mark according to any one of claims 1 to 4, characterized in that:

[6] In the solar cell, electric double layer capacitor, and LED power circuit, a thermistor is installed on the input side of the LED flashing circuit to detect the outside air temperature. When the road reaches the freezing temperature, the LED color automatically The self-luminous gaze guidance mark according to any one of claims 1 to 5, wherein the display is changed.

7. The self-luminous gaze guidance mark according to claim 6, wherein the color display is three colors of white, green, and red depending on a temperature range.