JP2577368Y2 - Lighting circuit of cornering lamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cornering lamp lighting circuit for lighting a cornering lamp.

[0002]

2. Description of the Related Art Conventionally, a cornering lamp 1, a turn signal lamp 2, a small lamp 3 and the like are electrically connected to a control circuit 4 provided on an instrument panel by a vehicle harness 5, as shown in FIG. Control circuit 4
The lamps 1 to 3 are turned on, blinked, and turned off in response to a signal from the controller.

[0003] As described above, the cornering lamp 1 mounted on the bumper may be retrofitted in accordance with a customer's request separately from the cornering lamp mounted on the vehicle body. A vehicle harness for connecting the control circuit 4 to the vehicle must be newly passed through the vehicle body, which is troublesome.

Therefore, a lighting circuit for the cornering lamp is provided in the housing of the lamp, and the lighting circuit for the cornering lamp is electrically connected to the turn signal lamp 2 to convert a blinking signal of the turn signal lamp 2 into a continuous lighting signal. There has been proposed a device in which the cornering lamp 1 is continuously turned on.

[0005]

In this case, the cornering lamp 1 is turned on simultaneously with the blinking of the turn signal lamp 2 when the vehicle turns right and left, and is turned off after a predetermined time from the end of the blinking of the turn signal lamp 2. It is desirable from the viewpoint that the corner is illuminated when turning the vehicle right and left.

Therefore, the blinking signal is smoothed by a smoothing circuit, the cornering lamp 1 is continuously turned on using the smoothed voltage, and the turn signal lamp 2 is turned on and off using the time constant of the smoothing circuit. It has been proposed to turn off the cornering lamp 1 with a delay (see Japanese Utility Model Application No. Hei 5-16427).

However, when the cornering lamp 1 is turned off after a predetermined time from the end of the blinking of the turn signal lamp 2 using this kind of smoothing circuit, the turn signal null lamp 2 is turned off based on the fluctuation of the blink signal. The delay time from the end of the blinking to the turning off of the cornering lamp 1 (hereinafter referred to as the off-delay time) varies. If the off-delay time varies, the cornering lamp 1 as an illumination lamp may be erroneously recognized as a signal lamp. The cornering lamp 1 may be turned on for a long time unnecessarily.

The present invention has been made in view of the above circumstances, and has as its object to provide a cornering lamp lighting circuit that can keep the off delay time of a cornering lamp constant even when the turn signal lamp signal voltage fluctuates. To provide.

[0009]

SUMMARY OF THE INVENTION A cornering lamp lighting circuit according to the present invention is provided to solve the above problems.
A blinking signal for blinking a turn signal lamp provided on the left and right sides of the vehicle is converted into a continuous lighting signal to continuously light the cornering lamp, and a predetermined time after the input of the blinking signal is stopped to turn off the cornering by turning off the cornering lamp. A smoothing circuit for smoothing the blinking signal, and a smoothing circuit connected in series to the cornering lamp and provided at a subsequent stage of the smoothing circuit to input a smoothing signal to a gate to continuously light the cornering lamp. And a constant voltage element provided before the smoothing circuit and for stabilizing a voltage input to the smoothing circuit.

[0010]

According to the present invention, the turn signal lamp blink signal is input to the constant voltage element to be a constant voltage, and the constant voltage is applied to the smoothing circuit having the CR time constant circuit. Therefore, even if the voltage of the blink signal for the turn signal lamp fluctuates, the off delay time of the cornering lamp in which the transistor for the cornering lamp changes from on to off is constant.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lighting circuit for a cornering lamp according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a left cornering lamp, 12 denotes a left turn signal lamp, 13 denotes left and right small lamps, and 14 denotes a left headlight as viewed from the driver.

As shown in FIG. 2, the cornering lamp 10 includes a housing 21 having a bulb 20 and a lens 22 attached to a front opening of the housing 21. A circuit case 30 is integrally attached to the housing 21. Similarly, the cornering lamp 10A on the right side has the same configuration, and a housing (not shown) is integrally attached to a case 30A. 20A is a right valve.
23 is a socket for mounting the valve 20, 24 is the valve 2
It is connected to a power supply via a small lamp 13 by a power supply line for supplying power to 0. 25 is a signal input line connected to a signal line (not shown) of the turn signal lamp 12;
Reference numerals 6 and 27 denote lighting circuits 40 described later provided in the case 30.
And a lighting circuit connected to a lighting circuit 60 described later provided in the case 30A. The case 30, 30A is provided with a circuit board (not shown).
As shown in FIG. 2, lighting circuits 40 and 60 for lighting the cornering lamps 10 and 10A by a blink signal for blinking the turn signal lamp 12 are provided.

The lighting circuit 40 includes the cornering lamp 10
Connected in series to a power transistor (power MOS
FET 41 and a smoothing circuit 42 for smoothing the blinking signal S1 of the turn signal lamp 12 input to the signal input line 25 and inputting the same to the gate 41G of the power transistor 41. The smoothing circuit 42 includes a diode 43,
It comprises a capacitor 44, resistors R1 to R4 and the like. Further, a capacitor 4 is provided at a stage preceding the smoothing circuit 42.
A Zener diode 47 as a constant voltage element is connected in parallel with the resistor 4 and in series with the resistor R1. The time constant of the smoothing circuit 42 is set longer than the pulse interval t of the blinking signal (see FIG. 4). When the blinking signal S1 is input from the signal input line 25, the blinking signal S1
1, a constant voltage is applied to the smoothing circuit 42 in the series circuit of the Zener diode 47.

A transistor 41 for setting the gate potential to the ground potential is connected to the gate 41G of the power transistor 41.
5 is connected. The base of the transistor 45 is grounded via a resistor R5, and is connected via a connection line 26 to a series circuit of a resistor R6 and a diode 46. The anode of the diode 46 is connected to the capacitor 64 of the lighting circuit 60. When the capacitor 64 is charged by the blink signal S11 and reaches a predetermined potential, the transistor 45 is turned on.

Similarly, a transistor 65 is connected to the gate 61G of the power transistor 61 of the lighting circuit 60, and the base of the transistor 65 is grounded via a resistor R25 and connected to a resistor R16 via a connection line 27.
And a diode 66 in series. Also,
The anode of the diode 66 is connected to the capacitor 44 of the lighting circuit 40. When the capacitor 44 is charged by the blink signal S1 and reaches a predetermined potential, the transistor 65 is turned on.

The transistors 45 and 65 and the resistor R
5, R6, R16, R25 and diodes 46, 66, etc.
Turn signal lamps 12 and 12A simultaneously blink signal S
1. Cornering lamp 2 when S11 is input
A prohibition circuit is configured to prohibit lighting of 0 and 20A. When the turn signal lamps 12 and 12A blink at the same time, it means that the vehicle is stopped, and the cornering lamp 20,
This is because lighting of 20A is unnecessary. Reference numeral 62 denotes a smoothing circuit similar to the smoothing circuit 42, which includes a diode 63, a capacitor 64, and the like. 25A is a signal input line connected to the signal line of the turn signal lamp 12A, and 67 is a Zener diode as a constant voltage element connected in series with the resistor R21.

Next, the operation of the lighting circuit of the cornering lamp of the above embodiment will be described.

On the side of the lighting circuit 40, the signal input line 2
5 is supplied with a blinking signal S1. Although this blinking signal S1 may fluctuate as shown by a broken line in FIG. 4, the blinking signal S1 is made to have a constant voltage by the Zener diode 47. This constant voltage is applied to the smoothing circuit 42 and smoothed, and becomes a smoothed signal S2. This smoothing signal S2 is input to the gate 41G of the power transistor 41, whereby the power transistor 41 becomes conductive. Due to the conduction of the power transistor 41, the cornering lamp 1
0 lights continuously.

On the other hand, the input of the blinking signal S1 charges the capacitor 44, and the potential of the capacitor 44 increases.
This potential is applied to the base of the transistor 65 via the diode 66 and the resistor R16, so that the transistor 65 is turned on and the gate 61G of the power transistor 61 is turned on.
Are grounded, and the power transistor 61 is forcibly turned off. Therefore, one cornering lamp 20
Is continuously lit, the other cornering lamp 20A is reliably prevented from being lit with any adjustment.

The gate voltage of the power transistor 41 and the time constant of the smoothing circuit 42 are set so as to be turned off a predetermined time T (see FIG. 4) after the input of the blink signal S1 is stopped. , Cornering lamp 20
Turns off a predetermined time T after the input of the blink signal S1 is stopped. Here, since the blinking signal S1 is converted into a constant voltage by the Zener diode 47 and input to the smoothing circuit 42, even if the voltage of the blinking signal S1 fluctuates, the charging potential of the smoothing circuit 42 is kept as constant as possible, The charging and discharging time of the circuit becomes constant, and therefore, the power transistor 41
Is constant, in other words, the off-delay time of the cornering lamp 10 is constant.

Next, when the blinking signal S11 is input to the lighting circuit 60 via the signal line 25A, the blinking signal S11 is similarly input.
11 is made constant by the Zener diode 67 and applied to the smoothing circuit. The smoothing circuit 62 converts the blinking signal S1 into a smoothed signal S12. The power transistor 65 is turned on by the smoothing signal S12, and the cornering lamp 10 is turned on.
A lights up. Then, the charging of the capacitor 64 by the input of the blink signal S11 increases the potential of the capacitor 64. As a result, the transistor 45 is turned on, the gate 41G of the power transistor 41 is grounded, and the power transistor 41 is forcibly turned off.

The blinking signal S is simultaneously applied to the signal lines 25 and 25A.
When 1 and S11 are input, both capacitors 44 and 64 are charged to a high potential, so that transistors 45 and 65 are turned on. As a result, the power transistors 41 and 61 are forcibly turned off, and the cornering lamps 10 and 10A are turned off.
Are not lit. In other words, when the blinking signals S1 and S11 are simultaneously output by operating the hazard switch (not shown), the turn signal lamps 12 and 12A blink, but the cornering lamps 10 and 10A do not light.

[0023]

[Effect of the Invention] Since the lighting circuit of the cornering lamp according to the present invention is configured as described above, the off delay time of the cornering lamp can be kept constant even if the turn signal lamp signal voltage fluctuates, and the illumination lamp can be maintained. It can be reliably prevented that the cornering lamp as is mistakenly recognized as a signal lamp. Further, it is possible to prevent the cornering lamp from being turned on longer than necessary.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vehicle body to which a lighting circuit of a cornering lamp according to the present invention is applied.

FIG. 2 is a perspective view showing a shape of a back side of the cornering lamp.

FIG. 3 is a circuit diagram of a lighting circuit of the cornering lamp according to the present invention.

FIG. 4 is a diagram for explaining a blink signal of a turn signal lamp.

FIG. 5 is a perspective view showing a vehicle body for explaining a conventional problem.

[Explanation of symbols]

 10, 10A: Cornering lamp 12, 12A: Turn signal lamp 40, 60 ... Lighting circuit 41, 61 ... Power transistor (transistor) 42, 62 ... Smoothing circuit 47, 67 ... Zener diode (constant voltage element)

Claims (1)

(57) [Scope of request for utility model registration] 1. A blinking signal for blinking turn signal lamps provided on the left and right sides of a vehicle is converted into a continuous lighting signal to continuously light a cornering lamp and to turn off the cornering by delaying a predetermined time from the stop of the input of the blinking signal. A lighting circuit for a cornering lamp, wherein a smoothing circuit for smoothing the blinking signal is connected in series with the cornering lamp, and a smoothing signal is input to a gate after the smoothing circuit and a gate receives the smoothing signal, and And a constant voltage element provided before the smoothing circuit and for stabilizing a voltage input to the smoothing circuit.