JPH0232517Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a passing light that is used to flash the headlights of a vehicle to indicate to a vehicle ahead that the vehicle intends to overtake.

(Background Art) Conventionally, when a car traveling behind passes a car in front, it has been widely practiced to flash the car's headlights to indicate its intention to overtake, in order to alert the car in front. It is being said. For this purpose, conventionally, a push button switch for turning on the headlights is provided in a position that can be operated by the driver, and the driver turns this push button switch on and off.
It is proposed to flash the headlights. However, in this conventional example, it is necessary to turn on and off the push button switch many times while driving the car, so there is a risk that the driver will be distracted by the blinking operation of the headlights and make a driving mistake. . In particular, when trying to overtake a car, the speed of the car is accelerating, so it is dangerous for the driver to become distracted, which poses a safety problem.

Therefore, the inventor of the present invention could reduce the burden on the driver by using an oscillation circuit that operates at an extremely low frequency to automatically flash the headlights while the pushbutton switch is held down. , I got the idea that it would be possible to overtake safely. However, when we actually prototyped the circuit, we found that it was so easy to make the headlights flash, compared to when the same driver used conventional passing lights. This meant that the number of times the headlight was turned on increased considerably, and it was found that the headlights were more likely to be damaged by repeatedly turning them on and off rapidly.

(Purpose of the invention) The present invention was made in view of the above-mentioned points, and its purpose is to make it possible to safely flash the headlights when overtaking, and to have the headlights flash automatically. To provide a passing light which can prevent the life of a headlight from being shortened due to

(Disclosure of the invention) In order to achieve the above object, the passing light of the invention has a push button switch PB installed at a position that can be operated by the driver, as shown in Fig. 1.
An operation switch like this and a battery installed in the car
BT, an oscillation circuit OSC that oscillates at an extremely low frequency using the battery BT as a power source when the operation switch is turned on, and a switching element SCR ₁ that is driven on and off according to the oscillation output of the oscillation circuit OSC.
SCR ₂ , resistance elements R ₆ and R ₉ connected in parallel with switching elements SCR ₁ and SCR ₂ , and when switching elements SCR ₁ and SCR ₂ are turned on, the battery BT is connected via switching elements SCR ₁ and SCR ₂ . It is turned on with a large current supplied from the battery BT to illuminate the front of the car, and when switching elements SCR ₁ and SCR ₂ are off, it is preheated with a small current supplied from the battery BT via resistive elements R ₆ and R ₉ . Hetdrite to be done
It is comprised of Lh and Ll.

The embodiment shown in FIG. 1 will be described in detail below. Switching elements SCR ₁ and SCR ₂ are reverse blocking 3
Consisting of a terminal type thyristor, the capacitor C ₃ ,
It constitutes a flip-flop circuit with a forced commutation circuit using _C4 . Switching element SCR ₁ ,
The SCR ₂ controls the energization of the upper headlight Lh and the lower headlight Ll, respectively. The upper headlight Lh is a headlight used to illuminate a far distance, and the lower headlight Ll is a headlight used to illuminate a near distance.

The oscillation circuit OSC that controls the conduction of switching element SCR ₁ is a unijunction transistor.
Consists of a relaxation oscillator circuit with UJT. The oscillation period of this oscillation circuit OSC is determined by the capacitor C ₁ and resistor R ₁
The unijunction transistor UJT conducts at regular intervals, the charge in the capacitor _C1 is discharged, and the electric charge in the resistor _R3 is determined by a time constant circuit consisting of
A pulse voltage is generated across the . This pulse voltage is input as a trigger signal to the gate of the switching element _SCR1 via the resistor _R4 and the diode D.

When pushbutton switch PB is pressed to turn on, capacitor C ₁ is connected via resistor R ₁ .
is charged. When the charging voltage of capacitor _C1 increases, the unijunction transistor UJT
conducts and discharges the charge in capacitor _C1 ,
Generate a pulse voltage across resistor _R3 . When switching element SCR ₁ is triggered by the pulse voltage from the oscillator circuit OSC, the switching element
SCR ₁ conducts. Since the switching element _SCR1 has a self-retaining property, it maintains the conductive state from then on.

At this time, a large current is applied from the battery BT to the upper headlight Lh via the switching element _SCR1 , and the upper headlight Lh is turned on. On the other hand, since switching element SCR ₂ is turned off, switching element
SCR ₁ , capacitor C ₃ , C ₄ , lower headlight Ll
A current flows through the capacitors C ₃ and C 4 , and the capacitors C 3 and C ₄ are charged so that the cathode side of the switching element SCR ₁ has a positive potential and the cathode side of the switching element SCR ₂ has a negative potential. Thereafter, a small current for preheating flows through the lower headlight Ll via the resistor _R9 .

By the way, when the switching element SCR ₁ is turned on, a current flows through the resistor R ₇ , the capacitor C ₂ , and the resistors R ₄ and R ₃ to charge the capacitor C ₂ .
When the charging voltage of capacitor _C2 increases and the Zener diode ZD becomes conductive, the switching element
The gate of SCR ₂ is triggered. By this,
The switching element SCR ₂ becomes conductive, the charging voltages of the capacitors C ₃ and _{C 4 are} applied to the switching element SCR 1 in the opposite direction, and the switching element SCR ₁ is turned off.

In this state, a large current is applied from the battery BT to the lower headlight Ll via the switching element _SCR2 , and the lower headlight Ll is turned on.
On the other hand, since switching element SCR ₁ is turned off, switching element
SCR ₂ , capacitor C ₄ , C ₃ , upper headlight Lh
A current flows through the capacitors C ₄ and C 3 , and the capacitors C 4 and C ₃ are charged so that the cathode side of the switching element SCR ₂ has a positive potential and the cathode side of the switching element SCR ₁ has a negative potential. Thereafter, a small current for preheating flows through the upper headlight Lh via the resistor _R6 .

In this state, when a pulse voltage is output from the aforementioned oscillation circuit OSC and switching element SCR ₁ is turned on, the charging voltage of capacitors C ₃ and C ₄ is applied to switching element SCR ₂ in the opposite direction, and the switching element is turned on. Element SCR ₂ is turned off.

By repeating the above operation, switching elements SCR ₁ and SCR ₂ are turned on and off alternately.
When switching element SCR ₁ is turned on, a large current is applied to the upper headlight Lh,
When turned off, a small preheating current flows through resistor _R6 . Similarly, switching element SCR ₂
When turned on, a large current flows through the lower headlight Ll, and when turned off, a small current for preheating flows through the resistor _R9 . Therefore, while operating the pushbutton switch PB,
The upper headlight Lh and the lower headlight Ll can be made to blink alternately, and since a small current for preheating is applied to each headlight Lh and Ll even during the lighting suspension period, the blinking can be automated. The life of the headlight will not be compromised by increasing the number of cycles.

In addition, when operating the push button switch PB, the changeover switch connected in parallel must be
Set the SW to the middle position. When this changeover switch SW is switched to the "Hi" position, the upper headlight Lh is always on, and when it is switched to the "Lo" position, the lower headlight Ll is always on.

In the above description of the embodiment, a circuit example using a reverse blocking three-terminal thyristor as the switching element was shown, but a power transistor may also be used as the switching element. In this case, an astable multivibrator may be used as the oscillation circuit. Furthermore, it goes without saying that the present invention can be applied not only to automobiles but also to motorcycles and bicycles.

(Effects of the invention) As described above, the present invention provides an oscillation circuit that oscillates at an extremely low frequency using the on-vehicle battery as a power source when the operation switch provided at a position that can be operated by the driver is turned on. Since the headlights are made to flash by a switching element that is turned on and off according to the oscillation output of the driver, the headlights can be automatically turned on and off simply by turning on the operating switch, reducing the burden of operation on the driver. Furthermore, by connecting a resistive element in parallel with this switching element, a small current for preheating is passed through the headlight even when the switching element is off. Even if the number of flashing of the headlight increases due to automation of flashing, there is an advantage that the life of the headlight can be prevented from being impaired.

As shown in the circuit in Figure 1, if a parallel circuit consisting of a switching element and a resistance element is connected in series with the operation switch, when the operation switch is turned off, the power is connected from the battery to the headlight through the resistance element. No current leaks, and the battery installed in the vehicle can be prevented from being inadvertently discharged.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention. BT is battery, Lh, Ll are hedrite,
OSC is an oscillation circuit, PB is a push button switch, R ₆ ,
_R9 is a resistor, and _SCR1 and _SCR2 are switching elements.

Claims (1)

[Scope of utility model registration request] An operation switch installed in a position that can be operated by the driver, a battery installed in the vehicle, an oscillation circuit that uses the battery as a power source to oscillate at an extremely low frequency when the operation switch is turned on, and an oscillation circuit that turns on and off according to the oscillation output of the oscillation circuit. A switching element to be driven, a resistance element connected in parallel with the switching element, and when the switching element is turned on, a large current is applied from the battery via the switching element to illuminate the front of the vehicle; A passing light comprising a headlight which is preheated by a small current supplied from the battery via a resistive element when the switching element is off.