JP3091325B2 - Vehicle lighting system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle lighting device for turning on a headlight and a backward light of a vehicle such as an automobile.

[0002]

2. Description of the Related Art Some vehicles such as automobiles use HID lamps (high-intensity discharge lamps) as light sources for headlights (head lamps). In such vehicles,
As a light source for a backward light (back-up lamp) that illuminates the rear of the vehicle when the vehicle retreats, there are a light source using an incandescent lamp and a light source using an HID lamp. FIG. 11 is a schematic view of a vehicle using an incandescent lamp as a backward light, and FIG.
FIG. 2 shows a schematic view of a vehicle using an HID lamp as a backward light.

In FIG. 11, reference numeral 51 denotes a vehicle body; 52, a headlight using an HID lamp as a light source; 53, a backward light using an incandescent lamp as a light source;
This is an inverter-type HID lamp lighting device for driving a D lamp at high frequency. In FIG. 12, 61 is a vehicle body,
62 is a headlight using an HID lamp as a light source, 63 is an HID lamp
A backward light using a lamp as a light source, 64 is an inverter type H for turning on a high frequency an HID lamp which is a light source of a headlight 62.
An ID lamp lighting device 65 is a light source of the backward light 63 H
This is an inverter-type HID lamp lighting device that turns on an ID lamp at high frequency.

[0004]

In consideration of the safety of the vehicle when the vehicle is moving backward, the light source of the backward light is more likely to be a light source using an HID lamp as shown in FIG. 12 than a light source using an incandescent lamp as shown in FIG. Is desirable. That is, when the light source of the backward light is an HID lamp, the visibility behind the vehicle is significantly improved, and the safety of the vehicle can be significantly improved.

However, in order to use a HID lamp as a light source, a special HID lamp lighting device is required unlike an incandescent lamp, and three to four HID lamps are combined with a HID lamp lighting device for a headlight. Since the lighting device is to be mounted on a vehicle, there are disadvantages such as being heavy, taking up a lot of mounting space, and increasing the cost. Therefore, an object of the present invention is to provide a vehicle lighting device which can use an HID lamp as a light source for backward lighting without increasing the number of HID lamp lighting devices, and can achieve weight reduction, space saving, and cost reduction. To provide.

[0006]

SUMMARY OF THE INVENTION A vehicle lighting device according to the present invention includes a headlight for illuminating the front of a vehicle and a backward light for illuminating the rear of the vehicle when the vehicle is retracted. Both backward lights use an HID lamp as a light source. A single HID lamp lighting device for turning on the headlight and the backward light is provided so that the headlight and the backward light can be selectively turned on and simultaneously, and the headlight and the backward light can be simultaneously turned on. Occasionally, the HID lamp lighting device is configured such that power is distributed and supplied to the headlight and the rearward lamp such that the total power supplied to the headlight and the rearward lamp is substantially equal to the power supplied for one lamp. I have.

[0007]

According to the structure of the present invention, when only the headlight is turned on, such as when the vehicle normally travels (forwards) at night, rated power is supplied from the HID lamp lighting device to the headlight. . For this reason, the brightness of the headlight can be made sufficiently high, and the front of the vehicle can be illuminated sufficiently brightly.

When only the backward light is turned on, such as when the vehicle is moved backward in the daytime, rated power is supplied to the backward light from the HID lamp lighting device. For this reason, the brightness of the reverse light can be made sufficiently high, and even when the surroundings of the vehicle are sufficiently bright, such as during the daytime, it is possible to make a third party outside the vehicle sufficiently aware that the vehicle is moving backward. it can.

When both the headlights and the backward lights are turned on, such as when the vehicle is moved backward at night, power is supplied to both the headlights and the backward lights from the HID lamp lighting device. At this time, the power is distributed and supplied to the headlight and the backward light in such a state that the total supply power to the headlight and the backward light is substantially equal to the supply power for one light. It is not necessary to equalize the power supplied to the headlight and the backward light.

[0010] For this reason, the brightness of the backward light is substantially reduced by half compared to when the rated power is supplied. However, even in this case, the rear of the vehicle can be illuminated sufficiently brighter than the backward light using an incandescent lamp as a light source. Thus, safety when the vehicle is backed up can be ensured. In addition, although the brightness of the headlight is substantially reduced by half as compared with the time of normal driving at night, the headlight can still be illuminated with sufficient illuminance to confirm safety ahead.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1A is a schematic view of a vehicle incorporating a vehicle lighting device according to a first embodiment of the present invention, and FIG. 1B is a schematic view of the vehicle according to the first embodiment. FIG. 1 is a schematic block diagram of a lighting device for a vehicle.

This vehicle lighting device is shown in FIG.
As shown in (b), a headlight 2 illuminates the front of the vehicle 1.
And a backward light 3 for illuminating the rear of the vehicle 1 when the vehicle 1 retreats. Both the headlights 2 and the backward light 3 use HID lamps 5 and 6 of, for example, 35 W as light sources. Then, only one HID lamp lighting device main body (ballast main body) 4 for lighting the headlight 2 and the backward light 3 is provided, and power is supplied from the storage battery 11 to the HID lamp lighting device main body 4, and the HI
Wiring is provided from the D lamp lighting device main body 4 to the headlight 2 and the backward light 3 respectively, and the igniters 9 and 10 for starting the HID lamps 5 and 6 near the headlight 2 and the backward light 3.
Is provided. The headlights 2 and the backward lights 3 can be selectively and simultaneously turned on by switching the headlight switches 7A and 7B and the backward lights switches 8A and 8B. And back light 3
At the same time, the HID is distributed and supplied to the headlight 2 and the backward light 3 such that the total supply power to the headlight 2 and the backward light 3 is substantially equal to the supply power for one light.
The lamp lighting device main body 4 is configured. The igniter may be omitted depending on the configuration of the HID lamp lighting device main body 4.

According to this vehicle lighting device, when only the headlight 2 is to be turned on, as in the case where the vehicle 1 normally travels (forwards) at night, the HID lamp lighting device main body 4 sends the headlight 2 Is supplied with a rated power of 35W. Therefore, the brightness of the headlight 2 can be sufficiently increased, and the front of the vehicle 1 can be illuminated sufficiently brightly. In the daytime, vehicle 1
When only the backward light 3 is to be turned on, as in the case of backward movement of the
Supply 5W rated power. For this reason, the brightness of the reverse light 3 can be made sufficiently high, and even when the surroundings of the vehicle 1 are sufficiently bright such as in the daytime, it is sufficiently recognized by a third party outside the vehicle that the vehicle 1 is moving backward. Can be done.

When both the headlights 2 and the backward lights 3 are to be turned on, such as when the vehicle 1 is moved backward at night, both the headlights 2 and the backward lights 3 are transmitted from the HID lamp lighting device main body 4. To supply power. At this time, the total supply power to the headlights 2 and the backward lights 3 is substantially equal to the supply power 35W for one light, that is, the headlights 2 and the backward lights 3
And distribute the power of 35 W in half (17.5 W each). It is not necessary to make the power supplied to the headlight 2 and the backward light 3 equal.

For this reason, the brightness of the backward light 3 is substantially reduced by half as compared with when the rated power is supplied. However, the backward light 3 illuminates the rear of the vehicle 1 sufficiently brighter than the backward light using an incandescent lamp as a light source. Thus, the safety of the vehicle 1 at the time of retreat can be ensured. In addition, the headlight 2 has approximately half the brightness as compared with the normal driving at night, but it can still be illuminated with sufficient illuminance to confirm safety ahead.

FIG. 2 shows a specific circuit example of the vehicle lighting device of FIG. 1B, and FIG. 3 shows a specific circuit example of the igniter in FIG. In FIG. 2, 11 is a voltage V
₁ (12V to 24V for vehicles). D
D is a boost converter that boosts the voltage V ₁ of the storage battery 11 to a voltage _VDC required for maintaining the lighting of the HID lamp, and includes a choke coil L ₀ , a transistor Q ₀ , a capacitor C ₀ ,
It comprises a diode D ₀ and a control unit CR ₀ for controlling on / off of the transistor Q ₀ .

The operation is well known (step-up chopper operation).
The description is omitted because there is _DCTo the state of the load
Regardless of the HID run
When the lamp voltage when the lamp is lit is approximately 85V,
Is usually set to about 200 to 400V. Q₁~
Q_FourIs a switching element composed of a MOSFET, D₁~
D_FourIs the switching element Q₁~ Q_FourAntiparallel connection
Continuous commutation diode, DR₁~ DR_FourIs a sui
Switching element Q₁~ Q_FourA drive circuit for driving on and off
L₁, L _TwoIs the inductor, C₁, C_TwoIs a smoothing capacitor
The above circuit constitutes a square wave inverter.
You.

When the rectangular wave inverter is operated by turning on the power, a rectangular wave voltage output to be applied to the HID lamps 5 and 6 for headlights and backward lights is obtained between both ends of the smoothing capacitors C ₁ and C _2. . These rectangular wave voltages are applied to the HID lamps 5 and 6 via the igniters 9 and 10, respectively, and the HID lamps 5 and 6 are activated by the activation pulses generated from the igniters 9 and 10, respectively. The HID lamps 5 and 6 are kept on.

As shown in FIG. 3, the igniter 9 includes a resistor Ri, a capacitor Ci, a voltage responsive switch element Qi, a pulse transformer PT, a relay Ry, and a contact SRy thereof. When the relay Ry is excited to turn on the contact SRy by operating the lighting switch of the headlight,
When the capacitor Ci is charged through the resistor Ri and the charged voltage of the capacitor Ci reaches the breakover voltage of the voltage-responsive switch element Qi, electric charge is discharged from the capacitor Ci through the primary side of the pulse transformer PT, and the secondary of the pulse transformer PT is discharged. By generating a high-voltage pulse on the HID lamp 5 and applying the high-voltage pulse to the HID lamp 5,
The ID lamp 5 is started and turned on.

As for the igniter 10, the igniter 9
The start pulse is generated by operating the backward switch lighting switch, and the HID lamp 6 is started and turned on. By the way, the circuit current flowing through the rectangular wave inverter is detected by the effective value current detector CDT and converted into a voltage signal.

The effective value current detector CDT includes a current detecting resistor Rdt and a root mean square circuit rms. And
The output signal of the effective value current detector CDT is converted to a differential amplifier AMP.
Compared with the reference voltage Vr by the output voltage of the resulting differential amplifier AMP Vx (FIGS. 4 (a) refer) and sawtooth oscillator generated from OSC ₁ frequencies F ₁ of the sawtooth wave voltage Vy (4 (A) is compared with a pulse width modulation circuit PWM including a comparator to generate a pulse width modulation signal Vz (see FIG. 4 (b)).

The above-mentioned pulse width modulation signal is inversely proportional to the effective value of the circuit current flowing through the rectangular wave inverter. The pulse width becomes wide when the circuit current is small, and becomes narrow when the circuit current is large. . The pulse width modulation signal (see FIG. 5A) from such a pulse width modulation circuit PWM and the frequency F ₂ (F ₂ ≪) generated from the square wave oscillator OSC ₂
F ₁ ) is applied to the inverting circuit NT (see FIG. 5B).
With added and inverted signal to the AND circuit the AND ₁ in the frequency F ₂ generated from the pulse width modulation signal and the rectangular wave oscillator OSC ₂ from the pulse width modulation circuit PWM (F ₂ «
F ₁ ) and the AND circuit AND ₂
Making a signal for turning on and off the switching elements Q ₁ to Q _4.

The switching signal output from the AND circuit AND ₁ (see FIG. 5C) is applied to the driving circuits DR ₁ and D ₁
The switching elements Q ₁ and Q ₄ are turned on / off via R ₄ , and the switching signal (see FIG. 5D) output from the AND circuit AND ₂ is supplied to the switching elements Q ₂ via driving circuits DR ₂ and DR _{3. 2} , Q ₃ on / off control,
The rectangular wave inverter is operated and its output is increased or decreased. With the above operation, the HID lamps 5, 6
The would substantially rectangular waveform of the lamp voltage Vla of the frequency F ₂ (see FIG. 5 (e)) is added.

In this case, the voltage level of the output signal of the effective value current detector CDT is made equal to the reference voltage Vr.
So that the off-duty of the switching elements Q ₁ to Q ₄ of the rectangular wave inverter is controlled. Now, since the output voltage _VDC of the boost converter DD is controlled to be constant, the power supplied to the HID lamps 5 and 6 is always kept constant in combination with the above-described control of the effective current. Therefore, regardless of whether one of the HID lamps 5 and 6 is selectively lit or both are lit simultaneously, the rated power of one HID lamp 5 (3 in this example).
5W) is only supplied. That is, when only one of the HID lamps 5 and 6 is lit, the rated power is supplied to the lit one. When both are turned on at the same time, approximately half of the rated power is supplied to the HID lamps 5 and 6, respectively.

According to the vehicle lighting device, the HID lamp lighting device main body 4 for lighting the headlight 2 and the backward light 3
And one of the headlights 2 and the backward lights 3 can be selectively turned on and simultaneously turned on. When the headlights 2 and the backward lights 3 are simultaneously turned on, the headlights 2 and the backward lights 3 are switched to one. To distribute the power to the headlights 2 and the backward lights 3 so that the total supply power is substantially equal to the supply power for one lamp,
Since the ID lamp lighting device main body 4 is configured, the backward lighting 3 can be performed without increasing the number of HID lamp lighting device main bodies 4.
The HID lamp 6 can be used as a light source for the headlight 2 and the rearward light 3, and it is possible to achieve weight reduction, space saving, and cost reduction as compared with the case where the HID lamp lighting device main body is separately provided for the headlight 2 and the backward light 3.

FIG. 6 is a circuit diagram of a vehicle lighting device according to a second embodiment of the present invention. As shown in FIG. 6, this vehicle lighting device has a basic configuration similar to that of the circuit of FIG. The difference from the circuit of FIG. 2 is that in view of the time required for the lighting state of the HID lamps 5 and 6 to stabilize, excessive power is supplied to the HID lamps 5 and 6 when the lamp voltage is low at the beginning of lighting. In this way, the luminous fluxes of the HID lamps 5 and 6 reach the stable luminous flux quickly. For this purpose, in the first embodiment, the supply of the constant reference voltage Vr to the amplifier AMP is stopped, the lamp voltages of the HID lamps 5 and 6 are detected, and the voltage Vl obtained by dividing the both lamp voltages by resistance is used. _1, a voltage Vq corresponding to the lower voltage ones of Vl ₂ is obtained as applied to the amplifier AMP.

In order to perform the above operation, a voltage selection output circuit 12 and voltage characteristic conversion circuits 13 and 14 are added. The voltage selection output circuit 12 includes a comparator CM
P, analog switches AS ₁ and AS ₂ , diodes D ₅ and D ₆ , a resistor R ₁ , and a capacitor C _{3. The} lower one of the voltages Vl ₁ and Vl _{2 obtained by} dividing the lamp voltage is used as the voltage Vlm. Output as The voltage Vl
₁ and Vl ₂ are obtained by partial pressure by resistors R _{2 to} R ₅ .

The voltage characteristic conversion circuit 13 includes an operational amplifier O
P ₁ , resistors R ₆ and R ₇ , diode D ₇ , reference voltage source E
₁ and the voltage characteristic conversion circuit 14 includes an operational amplifier OP
₂ , resistors R ₈ and R ₉ , diode D ₈ , reference voltage source E ₂
It is composed of And those characteristics become the characteristics as shown in FIG. FIG. 7 shows the voltage Vlm on the horizontal axis.
And the vertical axis shows the output voltage Vq.

When the voltage Vlm is low (initial lighting), the steep Vq-Vlm characteristic is determined by the voltage characteristic conversion circuit 13, and when the voltage Vlm is low (stable lighting), the gentle Vq-Vlm characteristic is obtained.
The -Vlm characteristic is determined by the voltage characteristic conversion circuit 14. Here, the voltage selection output circuit 12 and the voltage characteristic conversion circuits 13, 1
The operation of the circuit 4 and its peripheral circuits will be described.

Now, one of the headlight and the backward light,
For example, assuming that only the HID lamp 5 as a headlight is turned on, the voltage Vl ₂ is the same as that obtained by dividing the voltage _VDC by resistance since there is no load. On the other hand, the voltage Vl ₁ changes according to the lamp voltage of the HID lamp 5, but always Vl ₁ <Vl
₂ Therefore, the voltage selection output circuit 12 selects the voltage Vl ₁ and Vlm = Vl ₁ .

The voltage characteristic conversion circuits 13 and 14 output the voltage Vl
Since a characteristic as shown in FIG. 7 is given between m and the voltage Vq,
When the lamp voltage is low, such as at the beginning of lighting, a large amount of effective current can flow, and the power supplied to the HID lamp 5 at the beginning of lighting can be made larger than that at the time of stable lighting. Reach stable state quickly.

Thereafter, when the backward HID lamp 6 is turned on, Vl ₂ <Vl ₁ , so that the power supplied from the rectangular wave inverter to both the HID lamps 5 and 6 increases. Here, the inductor L ₁ and the smoothing capacitor C ₁
And an HID lamp 5 and a circuit including an inductor L ₂
And the smoothing capacitor C ₂ and the HID lamp 6 circuit and composed of, and towards the HID lamp 5 is stabilized,
Since the HID lamp 6 is immediately after lighting, the circuit composed of the inductor L ₂ and the smoothing capacitor C ₂ and the HID lamp 6 has a lower circuit impedance. Therefore, the power supplied from the square wave inverter is equal to the inductor L ₂ and the smoothing capacitor C ₂ and the HID.
A large amount of light is supplied to a circuit composed of the lamp 6 and the HID lamp 6 quickly reaches a stable luminous flux.

As described above, in this embodiment, the two-light HI
Regardless of the combination of the lighting states of the D lamps 5 and 6, excessive electric power is applied to the HID lamps 5 and 6 at the start of lighting.
The light beam can be supplied to the ID lamps 5 and 6 to stabilize the light flux quickly. The other effects are the same as those of the first embodiment. Third Embodiment FIG. 8 is a circuit diagram of a vehicle lighting device according to a third embodiment of the present invention.

In FIG. 8, S ₁ is a switch for turning on the HID lamp 5, and S ₂ is a switch for turning on the HID lamp 6. D ₁₃ and D ₁₄ are diodes. DD is a boost converter similar to that of the above embodiment.
In this embodiment, unlike the rectangular wave inverter of the above embodiment, the HID lamp 5 and the
6 is turned on, and the oscillation frequency of the voltage resonance type inverter is changed to change the voltage applied to the HID lamps 5 and 6 via the resonance circuit, thereby starting the lamps. The igniter can be omitted.

Q ₁₁ and Q ₁₂ are switching elements, and D ₁₁ and D
₁₂ is a diode. L ₁₁ is an inductor, C ₁₁ is a capacitor, which constitutes a resonant circuit KS _1. L
₁₂ inductor, C ₁₂ in the capacitor, these constitute a resonant circuit KS _2. The circuit constants are set so that the resonance frequencies of the two resonance circuits KS ₁ and KS ₂ are different. C ₁₃
Is a DC cut capacitor. DR ₁₁ and DR ₁₂ are drive circuits that drive the switching elements Q ₁₁ and Q _{12 on} and off, respectively.

OS₁~ OS_FiveIs the switching element Q₁₁,
Q₁₂Oscillator circuit that determines the on / off frequency of each
f₁~ F_FiveOscillates at Frequency f₁, F_TwoIs a resonance circuit
KS ₁, KS_TwoIs set approximately equal to the resonance frequency of
The frequency at which the HID lamps 5 and 6 are started
is there. Frequency f_ThreeTurns on the HID lamp 5 at the rated power.
Frequency at which the frequency f_FourIs HID run
Is the frequency at which the lamp 6 is kept lit at the rated power,
f_FiveIndicates that both HID lamps 5 and 6 are approximately half of the rated power
This is the frequency at which the lighting is maintained by two power shares.

MM ₁ and MM ₂ each have a metastable time T
_1, in the monostable multi-vibrator set to T _2, HI
The time for applying the high voltage for starting the D lamps 5 and 6 is defined. DLY in delay circuit sets the delay time T _3, when the switch S _1, S ₂ is turned on at the same time,
The generation of the high voltage for starting the HID lamps 5 and 6 is shifted in time.

OR₁, OR_TwoIs an OR circuit, AND_Ten~ A
ND₁₇Is an AND circuit, NT₁₁Are inverting circuits, and these are switches.
Switch S₁₁, S₁₂Oscillator circuit OS according to the state of₁~ OS
_FiveThe output of the drive circuit DR₁₁, DR₁₂Supply to
Logic circuit to be configured. Next, this vehicle lighting
The operation of the apparatus will be described with reference to FIGS.
You. FIG. 9 shows a waveform diagram of each part of the circuit of FIG. Figure
10 (a) is a resonance circuit KS₁FIG.
Yes, curve J₁Is the characteristic under no load, and the curve J _TwoIs H
This is a characteristic when the ID lamp 5 is turned on. FIG.
Oscillation circuit KS_TwoFIG. 8 is a characteristic diagram showing resonance characteristics of₁
Is the characteristic under no load, and the curve K_TwoIs the HID lamp 6
It is a characteristic at the time of lighting.

[0039] When the switch S ₁ is turned on as shown in FIG. 9 (a), is powered from a DC power source 11 to the boost converter DD, the voltage resonance type inverter voltage V _DC, which is boosted at its output is generated It is ready for operation. At this time, it operates the monostable multivibrator MM ₁ outputs a voltage of a predetermined time T ₁ by a high level as shown in Figure 9 (b). As a result, the rectangular wave signal of frequency f ₁ of the oscillator OS ₁ is applied to the switching element Q ₁₁ via the driving circuit DR _11, the inverted signal of the rectangular wave signal of frequency f ₁ via a driving circuit DR ₁₂ Switching element Q
₁₂ will be applied. As a result, the voltage resonance type inverter mainly including the switching elements Q ₁₁ and Q ₁₂ and the resonance circuits KS ₁ and KS ₂ oscillates at the frequency f _{1 as} shown in FIG. Since this frequency f ₁ is substantially equal to the resonance frequency of the resonance circuit KS ₁ , the resonance circuit K 1
So that the high voltage is applied to the HID lamp 5 by the resonant operation of S _1. As a result, the HID lamp 5 starts and turns on.

Thereafter, the monostable multivibrator MM ₁
Returns to low level, this time the oscillator OS
With square-wave signal of frequency f ₃ of ₃ is applied to the switching element Q ₁₁ via the driving circuit DR _11, the frequency f
Inverted signal of the _third rectangular wave signal is to be applied to the switching element Q ₁₂ via the drive circuit DR _12. As a result, the switching elements Q ₁₁ and Q ₁₂ and the resonance circuit K
The voltage resonance type inverter having S ₁ and KS ₂ as main components performs an oscillating operation at a frequency f _{3 as} shown in FIG. 9 (f), and keeps the HID lamp 5 lit when the rated power is supplied. .

Thereafter, as shown in FIG.
S_TwoIs turned on, the output signal of the delay circuit DLY is
As shown in (d), T_ThreeHigh level with time delay
You. When the output signal of the delay circuit DLY becomes high level,
Monostable multivibrator MM _TwoOperates, and FIG.
As shown in FIG._TwoOnly output high level voltage
I do. As a result, the oscillator OS_TwoFrequency f_TwoSquare wave signal
No. is the drive circuit DR₁₁Through the switching element Q₁₁Mark on
And the frequency f_TwoInverted signal of square wave signal of
Is the drive circuit DR₁₂Through the switching element Q₁₂Applied to
Will be done. As a result, the switching element Q₁₁,
Q₁₂And resonance circuit KS₁, KS_TwoIs the main component
As shown in FIG.
Number f_TwoOscillates with. This frequency f_TwoIs the resonance circuit K
S_TwoOf the resonance circuit KS_TwoOf
High voltage is applied to the HID lamp 6 by the vibration operation
Will be. As a result, the HID lamp 6 starts and lights up.
To reach.

Thereafter, the monostable multivibrator MM ₂
Returns to low level, this time the oscillator OS ₅
With a rectangular wave signal of a frequency f ₅ is applied to the switching element Q ₁₁ via the driving circuit DR _11, the frequency f ₅
Inverted signal of the rectangular wave signal is to be applied to the switching element Q ₁₂ via the drive circuit DR ₁₂ in. As a result,
Switching elements Q ₁₁ and Q ₁₂ and resonance circuits KS ₁ and K
Voltage resonance type inverter for the S ₂ as the main component, FIG. 9
And the oscillation operation at a frequency f ₅ as shown in (f), HID
Lighting is maintained in a state where approximately half of the rated power is supplied to each of the lamps 5 and 6.

Thereafter, when the switch S ₁ is turned off, a rectangular wave signal of the frequency f ₄ of the oscillator OS ₄ is applied to the switching element Q ₁₁ via the drive circuit DR _11, and the rectangular signal of the frequency f ₄ so that the inverted signal of the wave signal is applied to the switching element Q ₁₂ via the drive circuit DR _12. As a result, the voltage resonance type inverter having the switching elements Q ₁₁ and Q ₁₂ and the resonance circuits KS ₁ and KS ₂ as main components oscillates at the frequency f _{4 as} shown in FIG. 6 keeps lighting when the rated power is supplied.

When the order of turning on the switches S ₁ and S ₂ is reversed, the operation is performed in the same manner as described above and the HID
The lamp 6 is turned on, then the HID lamp 5 is turned on, and then the HID lamp 6 is turned off. When the switches S ₁ and S ₂ are turned on simultaneously, the delay circuit DLY
, The HID lamp 5 starts up and turns on,
After that, the HID lamp 6 is started and lights up.

In this embodiment, since the igniter can be omitted, the wiring of the harness in the vehicle body is simplified. Other effects are similar to those of the above-described embodiment.

[0046]

According to the vehicle lighting device of the present invention, the HID lamp lighting device for lighting the headlight and the backward light is provided as one unit, and the selective lighting and the simultaneous lighting of the headlight and the backward light are selected. When the headlights and the backward lights are simultaneously turned on, the total power supplied to the headlights and the backward lights is reduced by one.
Since the HID lamp lighting device is configured to distribute and supply the power to the headlight and the backward light in a state substantially equal to the supply power of the lamp, the backward lighting can be performed without increasing the number of the HID lamp lighting devices. An HID lamp can be used as a light source.
Lightening, space saving, and cost reduction can be achieved as compared with the case where a lamp lighting device is provided.

[Brief description of the drawings]

1A is a schematic view of a vehicle incorporating a vehicle lighting device according to a first embodiment of the present invention, and FIG. 1B is a schematic block diagram of the vehicle lighting device according to the first embodiment; It is.

FIG. 2 is a circuit diagram showing a specific circuit example of the vehicle lighting device of FIG. 1 (b).

FIG. 3 is a circuit diagram showing a specific circuit example of the igniter in FIG. 2;

4 is a waveform diagram of each part showing the operation of the vehicle lighting device of FIG. 2;

5 is a waveform diagram of each part showing the operation of the vehicle lighting device of FIG. 2;

FIG. 6 is a circuit diagram showing a configuration of a vehicle lighting device according to a second embodiment of the present invention.

7 is a characteristic diagram showing characteristics of the voltage characteristic conversion circuit in FIG.

FIG. 8 is a circuit diagram showing a configuration of a vehicle lighting device according to a third embodiment of the present invention.

9 is a waveform chart of each part showing the operation of the vehicle lighting device of FIG. 8;

FIG. 10 is a resonance characteristic diagram showing an operation of the vehicle lighting device of FIG. 8;

FIG. 11 is a schematic view of a vehicle using an incandescent lamp as a backward light.

FIG. 12 is a schematic view of a vehicle using an HID lamp as a backward light.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Headlight 3 Reverse light 4 HID lamp lighting device main body 5 HID lamp 6 HID lamp

Claims (1)

(57) [Claims] 1. A headlight for illuminating the front of a vehicle and a backlight for illuminating the rear of the vehicle when the vehicle retreats, wherein both the headlight and the rearward light are HID lamps. An HID lamp lighting device for lighting the headlight and the backward light is provided as one unit, and it is possible to select one of the headlight and the backward light and simultaneous lighting. At the same time, when the headlights and the backward lights are simultaneously turned on, the total power supply to the headlights and the backward lights is substantially equal to the supply power for one light. A lighting device for a vehicle, wherein the HID lamp lighting device is configured to distribute and supply power.