JPH0739039Y2 - Flashing light emission type traffic safety device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a "road sign" defined in Article 2 of the Road Traffic Act.
"Display board" and "Road tacks" among "Road markings" of the same Article of the same law, which flashes and emits light at night, as well as "traffic lights" during flashing operation, at construction sites. A red warning indicator light or blinker light installed (a warning light installed at the median strip of the road or at the tip of the lane branch, where the two lamps arranged above and below flash alternately. Device for protecting traffic safety, that is, a flashing light emitting traffic safety device.

(Prior Art) A conventional flashing traffic safety device is more attractive than a continuous lighting by blinking an indicator light.
The blinking cycle is always kept constant. This blinking cycle is selected as a predetermined value because the attractiveness is lowered if it is too fast or too slow, but the value has not been changed.

(Problems to be solved by the device) However, it has been found that the flashing cycle, which is the most attractive, varies significantly depending on the vehicle speed. That is, it is effective to increase the blinking cycle for low-speed vehicles and shorten it for high-speed vehicles.

The present invention has been made based on the above findings, and an object of the present invention is to obtain a flashing light emission type traffic safety device with high attractiveness.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention mounts a photoelectric resistance PH on the front surface of a flashing and emitting type road tack R, and travels toward the road tack R by the photoresistance PH. The output of the sensor 1 for detecting the vehicle speed by receiving the beam light Q of the vehicle headlight is connected to the drive circuit 2 for controlling the blinking cycle, and the indicator light 3
The flashing cycle of is changed according to the vehicle speed.

(Operation) The present invention configured as described above has a cycle according to the traveling speed of the vehicle, that is, a long cycle for a low speed vehicle,
For high speed vehicles, blink the indicator light at short intervals.

(Embodiment) FIG. 1 shows a relationship between a vehicle and a flashing light emitting type road tack as an example of a flashing light emitting type traffic safety device. Z is a vehicle traveling at a speed v in the direction of arrow r, and the beam light Q of its headlight is a flashing light emitting road tack R installed in front.
Irradiate. Photoelectric resistance PH on the front of flashing luminescent road tack R
Is attached, which receives the light beam Q.

As shown in FIG. 3, the photo-resistor PH is connected to the power source B in series with the resistor r ₀ , so that the output E of the photo-resistor PH is increased at the output terminal e according to the illuminance of the received light. Since the illuminance received by the light beam Q increases as the vehicle Z approaches the photoelectric resistance PH, the output E also increases accordingly.

The upper graph of FIG. 2 shows the change of the output E with respect to time T. Graphs a, b, c and d show changes in the output E obtained by vehicles having four different speeds. When the vehicle Z is at a distance, the photoelectric resistance PH does not sense the beam light Q and its output E is at the non-sensing level LA, but as the vehicle Z approaches, the output E increases and the light sensing level LB.
Over. Subsequent changes differ depending on the speed of the vehicle Z, and the fastest vehicle passes the installation position of the photoelectric resistance PH at time Ta as shown by the graph a, at which time the output E shows a peak. In the case of the latest vehicle, the peak of the output E is shown at the time Td as shown in the graph d. LC is a measurement reference level, and the time ta to td from when the level of the output E exceeds the light reception detection level LB to when it reaches the measurement reference level LC corresponds to the speed of the vehicle. For example, the traveling speed of the vehicle Z can be known.

FIG. 3 shows an example of a circuit for detecting the speed of the vehicle Z by the output E of the photo-resistor PH and controlling the blinking cycle accordingly.

Reference numeral 1 is a sensor for detecting the vehicle speed, 2 is a drive circuit for controlling the blinking cycle, and 3 is an indicator lamp. The voltage E obtained from the output terminal e of the photo-resistor PH is input to the Schmitt circuit S ₁ whose reaction level is the light-reception sensing level LB and the Schmitt circuit S ₂ whose reaction level is the measurement reference level LC. The output of the Schmitt circuits S ₁ is inputted to the AND gates the AND _1, the output of the Schmitt circuit S ₂ is input via the inverter I _n the AND gate the AND _1, is also input to the AND gate AND _2, AND ₃ . Clock pulse CP for AND gate AND ₁
Is input, and its output is input to the counter IC ₁ . The output of the counter IC ₁ is input to the memory latch IC ₂ via the AND gate AND ₂ , is stored, and its output is input to the DA conversion circuit via the decoder IC ₃ . D
The output of the -A conversion circuit controls the voltage controlled oscillator VCF, and its output is taken out as the output N via the AND gate AND ₃ . The output of the Schmitt circuit S ₁ is a monostable multi IC.
₄ is controlled and the reset signal Re of the counter IC ₁ and the memory latch IC ₂ is taken out.

The circuit operates as follows. When the output E of the photo-resistor PH exceeds the light reception sensing level LB, the output of the Schmitt circuit S ₁ becomes H level and the AND gate AND ₁ is opened, so that the clock pulse CP starts counting by the counter IC ₁ . This counting continues until the output E of the photo-resistor PH exceeds the measurement reference level LC, but at that time, the output of the Schmitt circuit S ₂ becomes H level, and AND gate
AND ₁ turns off and AND gate AND ₂ turns on. As a result, the counter IC ₁ has its input cut off, and its output is transferred to the memory latch IC ₂ via the AND gate AND ₂ and stored therein. The output of the memory latch IC ₂ is converted into a decimal signal by the decoder IC ₃ and input to the DA conversion circuit. The D-A conversion circuit includes voltage _dividing resistors r _{1 to} r _n connected in series.
And n connected between their connection points and ground respectively.
-1 transistor, which is turned on according to the output of the decoder IC ₃ , is selected, and the divided output corresponding to that is output as an analog voltage. Therefore, the D-A conversion circuit outputs an analog voltage according to the count number, and thereby controls the voltage controlled oscillator VCF, so that a signal having a frequency according to the count number is input to the AND gate AND ₃ . Since the AND gate AND ₃ is opened by receiving the H level output of the Schmitt circuit S ₂ until the output E of the photoelectric resistance PH becomes equal to or lower than the measurement reference level LC, the output N thereof depends on the count number of the indicator light (not shown). Blink at the specified frequency. Beam light Q passing through the vehicle to the photoelectric resistance PH
When the incidence of is finished, the outputs of the Schmitt circuits S ₁ and S ₂ become L level, so that the output N of the AND gate AND ₃ is cut off.
In this state, the indicator light is continuously turned on or blinked at the longest cycle.

When the output of the Schmitt circuit S ₁ becomes L level,
Since the monostable multi IC ₄ is triggered and it outputs the reset pulse Re for a short period of time, the counter IC ₁ and the memory latch IC ₂ are reset to prepare for the next count.

When the vehicle speed is high as shown in the graph a, the time ta until the output E of the photoelectric resistance PH exceeds the light reception sensing level LB and reaches the measurement reference level LC is short, and the clock pulse CP counted during that time is Is small (count number is 3 in the illustrated example). In that case, the D-A conversion circuit outputs a high analog voltage, and the voltage controlled oscillator VCF generates an output of high frequency (short cycle Ha). When the vehicle speed is slow as shown by the graph d, the count number increases (14 in the illustrated example) and the blinking period Hd also increases.

(Effect) As described above, the present invention mounts the photoelectric resistance PH on the front surface of the flashing and emitting type road tack R, and the road tack R is attached by the photoelectric resistance PH.
The output of the sensor 1 that detects the vehicle speed by receiving the beam light Q of the headlight of the vehicle traveling toward the vehicle is connected to the drive circuit 2 that controls the blinking cycle, and the blinking cycle of the indicator lamp 3 is set to the vehicle speed. Since it is changed in accordance with the speed, the indicator light can be blinked at an optimum cycle for the speed, and the attractiveness (ease of conspicuity) of the blinking light emission type traffic safety device can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing the relationship between a running vehicle and a light emitting tack,
FIG. 2 is a graph showing a change in illuminance according to vehicle speed and a time chart showing the number of clock pulse counts and blinking cycles in association with each other, and FIG. 3 is a circuit diagram of an embodiment. Z ...... vehicle, PH ...... photoelectric resistors, S _1, S ₂ ...... Schmitt circuit, IC ₁ ...... counter, VCF ...... voltage controlled oscillator, ta through td
...... Rise time

Claims (1)

[Scope of utility model registration request] 1. A photoelectric resistor PH is provided on the front surface of a flashing type road tack R.
Is attached to the drive circuit 2 for controlling the blinking cycle of the output of the sensor 1 which detects the vehicle speed by receiving the beam light Q of the headlight of the vehicle traveling toward the road tack R by the photoelectric resistance PH. A flashing light emission type traffic safety device that is connected and changes the flashing cycle of the indicator light 3 according to the vehicle speed.