JPH0540089Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is installed on the side of the road, etc., to guide the driver's line of sight at night, and to accurately see the road shape such as curve points. The present invention relates to a variable blinking line guide for alerting people by changing the blinking speed of the light emitted.

(Prior art) As a general prior art related to the present invention, a reflective material with a large number of diamond cuts on the back side of a plate-shaped body made of synthetic resin such as polycarbonate resin is used to prevent vehicles from seeing it. Line-of-sight guideposts (delineators) that reflect the irradiated light are widely used.

Also, in Delineator, solar cells,
A self-luminous system that uses a storage battery and a light emitting diode and judges the brightness of the sky (surroundings) based on the electromotive voltage of a solar cell and constantly flashes only at night (for example, Japanese Patent Application Laid-Open No. 176709/1983) is known. There is.

(Problems to be Solved by the Present Invention) Among the above-mentioned conventional technologies, the reflected light method utilizes the retroreflectivity of reflective materials, and emits reflected light only when the vehicle approaches a certain range.
It is difficult to see the shape of a road in the distance, the vehicle driver's visual inertia makes it easy to overlook the reflection of vehicle lights, and there is no stimulating movement, so the effect of alerting the driver is weak.

Furthermore, although the self-luminous system has the advantage of being able to see the shape of the road from a distance, the blinking is very monotonous and does not have exciting changes, and the effect of alerting people to dangers such as curves is not sufficient.

The present invention attempts to improve the conventional technology in view of these points.The purpose of this invention is to clarify the road shape by using a constant flashing system at night, and to identify the danger level of the road at the vehicle approach point. The present invention provides a line-of-sight guide that can call attention to things by using a variable blinking method.

(Means for Solving the Problems) In order to achieve the above object, the present invention compiles the electromotive voltage of the solar cell and the reference voltage in the circuit configuration of a line guide sign equipped with a solar cell, a light emitting diode, and a phototransistor. A multivibrator is activated by the signal from the surrounding sensor unit compared with the vibrator, and the output of the multivibrator causes a group of light emitting diodes to blink. Furthermore, a phototransistor is connected as a photoelectric conversion element in the upper stage, and a volume is connected in the lower stage, and the change in voltage at the connection point is differentiated by a differentiator circuit consisting of a capacitor and a resistor to obtain the amount of change in the voltage at the connection point. The time constant of the multivibrator is halved by comparing the output from the vehicle sensor section that outputs a signal with a reference voltage using a comparator (comparison circuit) and passing current through a resistor in the multivibrator through a transistor.
By changing the oscillation speed to 1/4,
The blinking speed of the light emitting diode is doubled or quadrupled.

(Function) With the above configuration, the light emitting diode group always blinks at night, and when a vehicle approaches, the blinking speed of the light emitting diode group doubles due to the increase in the amount of light received. Furthermore, when the vehicle approaches, the amount of light received increases rapidly, causing the flashing speed to quadruple. This allows you to concentrate your attention on the road shape.

(Example) Examples will be described with reference to the drawings.

Figure 1 shows a line-of-sight guide specimen 1 with a solar cell 2 on the top surface, four light emitting diodes 3 on the outer periphery of a reflective material 5 on the front, and a phototransistor 4 as a photoelectric conversion element that changes the current value depending on the incident light flux. is attached to.

FIG. 2 is a circuit diagram of the control circuit, which includes a vehicle sensor section A that senses vehicle lights, a control section C that has a multivibrator 32, a sensor section B that senses the brightness of the sky (surroundings), a light emitting diode lighting section 30, It is composed of a group of light emitting diodes 31.

First, the ambient sensor part B sets the voltage generated by the solar cell 2 to be divided by the volume 8 so that the maximum voltage is V _DD -1V, and the divided output and the volume 7 are used to divide the set voltage. There is a comparator 9 using an operational amplifier for comparison, and when the voltage at point a is higher than the voltage at point b, the output of the comparator 9 becomes high level. Conversely, when the voltage at point b becomes higher, the output becomes low level.

The vehicle sensor section A has a phototransistor 4 connected to the upper stage and a volume 10 connected to the lower stage, and the volume 10 is set so that the voltage at the connection point c becomes V _DD -1V at dusk, and the next stage is connected to the capacitor 11 and the volume 10. It has a differential circuit consisting of 12 resistors,
It differentiates the change in voltage at point c and outputs the amount of displacement to point d. If the voltage at point c increases, the voltage at point d increases due to that change, and the voltage at point C must remain the same. For example, after a period of time determined by the time constants of the capacitor 11 and resistor 12, the voltage at point d returns to 0V.

Next, when the voltage at point c drops, the voltage at point d becomes 0V or less due to this change, but because the diode 13 is inserted in the opposite direction between point d and ground, it quickly returns to 0V. The comparator 15 compares the output from the differentiating circuit with a reference voltage set in advance by the volume 14 and the comparator 17 by the volume 16, and the reference voltage is set so that the voltage at point e>the voltage at point f. has been done. Differentiator circuit output (voltage at point d)
is higher than the voltage at point e, comparator 1
5 and 17 are both at high level, and when the voltage at point d is between the voltage at point e and the voltage at point f, the output of comparator 15 is at low level, and the output of comparator 17 is at high level. Further, when the voltage at point d is lower than the voltage at point f, the outputs of comparators 15 and 17 both become low level.

Control part C is multivibrator 32
There are resistors 23, 24, 25, 26, 2 connected to the bases of two transistors 33, 34.
The resistance values of resistors 7 and 28 are set so that resistor 23 = resistor 24 = 2 x resistor 25, resistor 27 = resistor 28 = 2 x resistor 26, and when the output of ambient sensor section B becomes high level, transistor 18 turns on. It operates and oscillates with a time constant determined by resistors 23 and 28 and capacitors 21 and 22. The pulse signal of the multivibrator 32 passes through the buffer gate 29 and is sent to the light emitting diode lighting section 30.
The light emitting diode group 31 blinks. At this time, when the output of the comparator 17 of the vehicle sensor section A becomes high level, the transistor 20
is activated, current flows through the resistors 24 and 27, and the time constant of the multivibrator 32 becomes 1/2. As a result, the light emitting diode group 31 blinks at twice the initial speed. Separately, when the outputs of the comparators 15 and 17 of the vehicle sensor section A both become high level, the transistors 19 and 20 are activated and current flows through the resistors 24, 25, 26, and 27, so that when the multivibrator 32 The constant is 1/4, and the light emitting diode group 31 flashes at four times the initial speed.

Next, to explain the mode of operation, first, when the power is turned on, if it is daytime, the ambient sensor part B outputs the output of the comparator 9 because the voltage obtained by dividing the electromotive voltage of the solar cell 2 is higher than the reference voltage. becomes low level, the transistor 18 does not operate, and the multivibrator 32 also does not operate. Therefore,
The light emitting diode group 31 also does not blink. Also, there is no change in the voltage at point c of the vehicle sensor section A, and the voltage at point d is 0V, which is lower than the reference voltage at points e and f, so both comparators 15 and 17 become low level. ing.

When it gets dark in the evening, the electromotive voltage of the solar cell 2 in the surrounding sensor section B starts to drop. At this time, when the voltage at point a drops from the reference voltage at point b, the output of comparator 9 becomes high level, multivibrator 32 oscillates with a time constant determined by resistors 23 and 28 and capacitors 21 and 22, and a pulse signal is emitted. The light is sent to the diode lighting unit 30, and the light emitting diode group 31 blinks. In addition, since the voltage at point c in vehicle sensor section A drops, the voltage at point d is
However, since diode 13 is connected in the opposite direction, the voltage at point d remains 0V, which is lower than the reference voltage at points e and f, and the outputs of comparators 15 and 17 are low. The light emitting diode group 31 remains at the same level, and the blinking speed of the light emitting diode group 31 does not change.

Next, when a vehicle approaches, the amount of increase in the amount of light received by the vehicle is low when the vehicle is far away, and the voltage at point c increases very slowly.
Since there is almost no increase in the voltage at point and it is not higher than the reference voltage at points e and f, comparator 1
The outputs of 5 and 17 both become low level, the time constant of the multivibrator 32 does not change, and the light emitting diode group 31 blinks in its initial state.

Next, at the stage when the vehicle approaches considerably, the amount of increase in the amount of light received increases, and the voltage rise at point c becomes somewhat faster. Along with this, the voltage at point d increases,
When the voltage at point d rises higher than the reference voltage at point f,
The output of comparator 17 becomes high level,
The transistor 20 is activated, current also flows to the resistors 24 and 27, the time constant of the multivibrator 32 becomes 1/2 of the initial value, and the light emitting diode group 31 blinks at twice the initial speed.

As the vehicle approaches further, the amount of light received increases rapidly and the voltage rise at point c becomes faster. Along with this, the voltage at point d further increases, and e
When the voltage becomes higher than the reference voltage at the point, the outputs of comparators 15 and 17 both become high level, transistors 19 and 20 are activated, and resistors 24 and 2
5, 26, and 27, the time constant of the multivibrator 32 becomes 1/4 of the initial value, and the light emitting diode group 31 blinks at 4 times the initial speed.

Next time a vehicle passes, phototransistor 4
Current no longer flows through point C, and the voltage at point C decreases. Along with this, point d tries to become below 0V, but d
Diode 1 installed in the opposite direction between the point and ground
3, it quickly returns to 0V, and the voltage at point d becomes f
Since the voltage is lower than the reference voltage at the point, the outputs of the comparators 15 and 17 become low level, the multivibrator 32 oscillates with the initial time constant, and the light emitting diode group 31 blinks at the initial speed.

Next, in the morning, when night falls, vehicle sensor section A
The amount of light received by phototransistor 4 increases, and c
Although the voltage at point rises, it rises very slowly, so that point d is close to 0V, which is lower than the reference voltage at point f, and the outputs of comparators 15 and 17 both remain at low level. Therefore, the light emitting diode group 31 is blinking at the initial speed. At this time, solar cell 2 generates electricity and the voltage at point b rises, causing
When the voltage becomes higher than the reference voltage at the point, the output of the comparator 9 becomes low level, the multivibrator 32 stops operating, and the light emitting diode group 31
The lights also go out.

(Effects of the invention) This invention reinforces the insufficient alerting effect of the continuous flashing system at night and adds a two-stage flashing acceleration system to increase attention to the road shape and is effective in preventing traffic accidents at night. It is something that brings. In addition, since this design uses a method in which the flashing cycle changes depending on the change in the amount of light received when a vehicle approaches, the sensing distance changes in response to the approaching speed. This has the advantage of being able to alert people.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a control diagram.

Claims (1)

[Scope of utility model registration request] The ambient sensor section consists of a comparator that compares the electromotive voltage of the solar cell with a reference voltage, a photoelectric conversion element is connected to the upper stage, a volume is connected to the lower stage, and a differentiating circuit is connected to the next stage, and the output of the differentiating circuit and A vehicle sensor section consisting of two comparators that compare the voltage with a reference voltage, a control section with a multi-vibrator activated by the output from each sensor section, a line-of-sight guide consisting of a light emitting diode lighting section and a group of light emitting diodes. In the standard, the output of the differentiating circuit and the two levels of reference voltage are compared with each of the above comparators and outputted, and the blinking speed of the light emitting diode is set to 2 by applying the output to the resistor in the multivibrator. A variable blinking line-of-sight guide that is characterized by being able to change by 2x or 4x.