JPH0731480U - Cornering lamp lighting circuit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a lighting circuit for a cornering lamp that can keep the off-delay time of the cornering lamp constant even if the voltage of the blinking signal of the turn signal lamp fluctuates. [Structure] A cornering lamp 10 according to the present invention,
The lighting circuits 40 and 60 of the 10A convert a blinking signal for blinking the turn signal lamps 12 and 12A provided on the left and right of the vehicle into a continuous lighting signal to continuously turn on the cornering lamp and a predetermined time from the stop of the input of the blinking signal. With a delay, turn off the corner rings 10 and 10A,
Smoothing circuits 42 and 62 for smoothing blinking signals and smoothing circuits 42 and 62 connected in series to the cornering lamp
Transistors 41 and 61 that are provided in the subsequent stage and that continuously input the smoothing signal to the gates to turn on the cornering lamps 10 and 10A, and a constant voltage that is provided in the previous stage of the smoothing circuit and that makes the voltage input to the smoothing circuit constant. Element 47,6
7 and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a cornering lamp lighting circuit for lighting a cornering lamp.

[0002]

[Prior art]

 Conventionally, the cornering lamp 1, the turn signal lamp 2, the small lamp 3, etc. are electrically connected to the control circuit 4 provided on the instrument panel by the vehicle harness 5 as shown in FIG. The lamps 1 to 3 are turned on, blinked, and turned off by a signal from.

By the way, as described above, the cornering lamp 1 attached to the bumper may be retrofitted separately from the cornering lamp attached to the vehicle body according to the customer's request. In such a case, the cornering lamp 1 The vehicle harness for connecting the control circuit 4 and the control circuit 4 must be newly passed through the vehicle body, which is troublesome.

Therefore, the lighting circuit of the cornering lamp is provided in the housing of the lamp, and the lighting circuit of the cornering lamp is electrically connected to the turn signal lamp 2 to convert the blinking signal of the turn signal lamp 2 into a continuous lighting signal. However, it is proposed that the corner ring lamp 1 is continuously lit.

[0005]

[Problems to be solved by the device]

 In this case, it is necessary to turn on the cornering lamp 1 at the same time when the turn signal lamp 2 blinks when turning left and right of the vehicle body, and turn it off after a predetermined time after the blinking of the turn signal lamp 2 is turned off. It is desirable from the viewpoint of illuminating the corner.

Therefore, the blinking signal is smoothed by a smoothing circuit, the smoothing voltage is used to continuously turn on the cornering lamp 1, and the time constant of the smoothing circuit is used to blink the turn signal lamp 2. It has been proposed to turn off the cornering lamp 1 after the end (see Japanese Patent Application No. 5-16427).

However, if the cornering lamp 1 is turned off after a predetermined time has elapsed from the end of blinking of the turn signal lamp 2 by using this kind of smoothing circuit, the turn signal null lamp 2 of the turn signal lamp 2 is changed based on the variation of the blink signal. Fluctuations occur in the delay time from the end of blinking until the corner ring lamp 1 goes out (hereinafter referred to as the "off delay time"). If the off-delay time varies, the cornering lamp 1 as an illuminating lamp may be mistakenly recognized as a signal lamp. Further, the cornering lamp 1 may be unnecessarily turned on for a long time.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cornering lamp lighting circuit capable of keeping the off-delay time of the cornering lamp constant even if the turn signal voltage of the turn signal lamp fluctuates. To do.

[0009]

[Means for Solving the Problems]

 In order to solve the above problems, the cornering lamp lighting circuit according to the present invention converts a blinking signal for blinking turn signal lamps provided on the left and right of the vehicle into a continuous lighting signal to continuously turn on the cornering lamp and the blinking signal. Is a lighting circuit of a cornering lamp that turns off the cornering after a predetermined time delay from the stop of the input of, the smoothing circuit that smoothes the blinking signal, and the latter stage of the smoothing circuit that is connected in series with the cornering lamp. A transistor for continuously driving the cornering lamp when a smoothing signal is input to the gate, and a constant voltage element provided in the preceding stage of the smoothing circuit for stabilizing the voltage input to the smoothing circuit. And having.

[0010]

According to the present invention, the turn signal lamp blinking 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 blinking signal for the turn signal lamp fluctuates, the off-delay time of the cornering lamp where the transistor for the cornering lamp changes from on to off becomes constant.

[0011]

【Example】

 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, 10 is a left cornering lamp when viewed from the driver, 12 is a left turn signal lamp, 13 is a left and right small lamp, and 14 is a left headlight.

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 right cornering lamp 10A has the same structure, and the case 30A is integrally attached to the housing (not shown). 20A is a valve on the right side. Reference numeral 23 is a socket for mounting the bulb 20, and 24 is a power supply line for supplying power to the bulb 20, which is connected to a power source through the small lamp 13. Reference numeral 25 is a signal input line connected to a signal line (not shown) of the turn signal lamp 12, 26 and 27 are a lighting circuit 40 described later provided in the case 30 and a lighting circuit 60 described later provided in the case 30A. Is a lead wire connected to. A circuit board (not shown) is provided in each of the cases 30 and 30A, and the cornering lamps 10 and 10A are turned on by a blinking signal for blinking the turn signal lamp 12, as shown in FIG. Lighting circuits 40 and 60 are provided.

The lighting circuit 40 smoothes the blinking signal S 1 of the power transistor 41 (power MOS FET) connected in series to the cornering lamp 10 and the turn signal lamp 12 input to the signal input line 25 to smooth the blinking signal S 1 of the power transistor 41. And a smoothing circuit 42 for inputting to the gate 41G. The smoothing circuit 42 is composed of a diode 43, a capacitor 44, resistors R1 to R4 and the like. Further, a Zener diode 47 as a constant voltage element is connected in parallel with the capacitor 44 and in series with the resistor R1 in the preceding stage of the smoothing circuit 42. 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 is applied as a constant voltage to the smoothing circuit 42 in the series circuit of the Zener diode 47 via the resistor R1.

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

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 the resistor R25 and is also connected via the connection line 27. It is connected to the series circuit of R16 and diode 66. The anode of the diode 66 is connected to the capacitor 44 of the lighting circuit 40, and when the capacitor 44 is charged by the blinking signal S1 and reaches a predetermined potential, the transistor 65 becomes conductive.

The transistors 45 and 65, the resistors R5, R6, R16 and R25, and the diodes 46 and 66, etc. are connected to the corner signal lamp 20, when the blinking signals S1 and S11 are simultaneously input to the turn signal lamps 12 and 12A. A prohibition circuit that prohibits lighting of 20 A is configured. When the turn signal lamps 12 and 12A flash at the same time, it means that the vehicle is stopped and it is not necessary to turn on the cornering lamps 20 and 20A. Reference numeral 62 is a smoothing circuit similar to the smoothing circuit 42, and is composed of a diode 63, a capacitor 64, and the like. Further, 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 for the cornering lamp of the above embodiment will be described.

On the lighting circuit 40 side, the blinking signal S 1 is input to the signal input line 25. The blinking signal S1 may fluctuate as shown by the broken line in FIG. 4, but the blinking signal S1 is made a constant voltage by the Zener diode 47. This constant voltage is applied to the smoothing circuit 42 and smoothed to become a smoothed signal S2. This smoothed signal S2 is input to the gate 41G of the power transistor 41, whereby the power transistor 41 becomes conductive. The conduction of the power transistor 41 causes the cornering lamp 10 to continuously light up.

On the other hand, the capacitor 44 is charged by the input of the blinking signal S1, the potential of the capacitor 44 becomes high, and this potential is applied to the base of the transistor 65 via the diode 66 and the resistor R16. The power transistor 61 is turned on, the gate 61G of the power transistor 61 is grounded, and the power transistor 61 is forcibly turned off. Therefore, when one of the cornering lamps 20 is continuously lit, the other cornering lamp 20A is reliably prevented from being lit with some adjustment.

The gate voltage of the power transistor 41 and the time constant of the smoothing circuit 42 are set to turn off after a predetermined time T (see FIG. 4) after the input of the blinking signal S1 is stopped. The cornering lamp 20 is turned off after a lapse of a predetermined time T after the input of the blinking signal S1 is stopped. Here, the blinking signal S1 is converted into a constant voltage by the Zener diode 47 and input to the smoothing circuit 42. Therefore, even if the voltage of the blinking signal S1 changes, the charging potential of the smoothing circuit 42 is kept as constant as possible. , The CR circuit has a constant charging / discharging time, so that the off-delay time of 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 made a constant voltage by the Zener diode 67 and applied to the smoothing circuit. The smoothing circuit 62 converts the blinking signal S1 into a smoothing signal S12. The power transistor 65 is turned on by this smoothing signal S12, and the cornering lamp 10A is turned on. Then, the potential of the capacitor 64 is increased by charging the capacitor 64 by inputting the blinking signal S11. 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.

When the blinking signals S1 and S11 are simultaneously input to the signal lines 25 and 25A, both capacitors 44 and 64 are charged to have a high potential, so that the transistors 45 and 65 are turned on. As a result, the power transistors 41 and 61 are forcibly turned off, and neither of the cornering lamps 10 and 10A is turned on. In other words, when the blinking signals S1 and S11 are simultaneously output by the operation of 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 device]

 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 cornering lamp as an illuminating lamp can be maintained. Can be surely prevented from being mistakenly recognized as a signal light. In addition, it is possible to prevent the cornering lamp from being lit longer than necessary.

[Brief description of drawings]

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

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

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

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

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

[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)

[Scope of utility model registration request] 1. A cornering lamp is continuously turned on by converting a blinking signal for blinking turn signal lamps provided on the left and right sides of a vehicle into a continuous lighting signal, and at the same time, the cornering is extinguished by delaying a predetermined time from the stop of inputting the blinking signal. A lighting circuit for a cornering lamp, wherein the smoothing circuit smoothes the blinking signal, and the cornering lamp is connected to the cornering lamp in series and is provided in a stage subsequent to the smoothing circuit to input a smoothing signal to a gate. A cornering lamp lighting circuit, comprising: a transistor for continuously lighting the lighting circuit; and a constant voltage element that is provided in a preceding stage of the smoothing circuit to make a voltage input to the smoothing circuit constant.