JP6718229B2 - Lighting device, vehicle lamp - Google Patents

Description

The present invention relates to a lighting device and a vehicular lamp, and more particularly to a technical field of a lamp for synchronously blinking a plurality of lighting units.

JP-A-2000-91092

The above Patent Document 1 discloses a lighting circuit for a vehicle warning light.
For example, some emergency vehicles, police vehicles, etc. are equipped with a plurality of warning lights. For example, warning lights are installed on the left and right front of the roof of an ambulance.

The warning light performs a flashing light emitting operation, such as a triple flash. When a plurality of warning lights perform such blinking, it is necessary that the lighting timings of the warning lights are synchronized.
Further, if one of the warning lights cannot be lit due to disconnection of the cable or the like, it is necessary to perform the blinking operation with only the other warning light.
In addition to performing the synchronized flashing in this way, a microcomputer is usually installed in the lighting circuit to perform control so that each warning light also flashes independently, so that the operation according to the state of the other lighting circuit can be executed. To do.
However, mounting the microcomputer increases the cost of the lighting circuit.
Therefore, an object of the present invention is to realize a function as a warning light by a circuit configuration that can be realized at low cost.

A lighting device according to the present invention includes: a first lighting circuit that causes a first light emitting unit to blink based on a first signal that defines a blinking light emission timing; and the first signal when the first signal is supplied. A second lighting circuit that generates a second signal synchronized with the second light emission circuit, generates a second signal when the first signal is not supplied, and causes the second light emitting unit to blink based on the generated second signal. With.
That is, the first lighting circuit is on the master (parent) side, and the second lighting circuit is on the slave (child) side. The second lighting circuit drives the second light emitting unit based on the second signal (second timing signal) synchronized with the first signal (first timing signal) or the asynchronous second independent signal.

In the above lighting device, the first signal may be a signal that defines a light emitting operation in which a blinking period in which blinking is performed a plurality of times and a stop period in which the blinking is stopped for a predetermined time are alternately repeated.
That is, the first signal is a signal for controlling a suitable light emitting operation as a warning light for an emergency vehicle.

In the above lighting device, the first lighting circuit includes a first signal generating unit that generates the first signal, a synchronization instruction signal output unit that outputs a synchronization instruction signal, and a signal that outputs the first signal. An output unit, the second lighting circuit includes a synchronization instruction signal input unit that receives the synchronization instruction signal from the first lighting circuit, and the first signal from the first lighting circuit. And a second signal generating section for generating a second signal synchronized with the first signal or an asynchronous second signal in response to the input of the synchronization instruction signal input section. It is possible.
That is, in the second lighting circuit, the second signal generator switches between generation of the second signal synchronized with the first signal and generation of the asynchronous second independent signal. This switching is based on the synchronization instruction signal from the first lighting circuit.

In the above lighting device, the synchronization instruction signal may be a signal of a predetermined voltage generated based on the input power supply voltage in the first lighting circuit.
The first lighting circuit generates an operating voltage or the like of each circuit portion based on the input power supply voltage, and one of the operating voltages is used as a synchronization instruction signal.

A vehicular lamp according to the present invention is a vehicular lamp that is provided in a front end portion or a rear end portion of a vehicle and is arranged in a pair of left and right. One lighting circuit is provided, and the second light emitting unit and the second lighting circuit described above are provided to the other lamp on the left and right. The same IC is used for the first signal generating section and the second signal generating section.
That is, a vehicular lamp using the first and second light emitting parts and the first and second lighting circuits as left and right lamps is realized. In this case, by using the same IC for the first signal generating section and the second signal generating section, efficiency of parts and cost reduction are achieved.

According to the present invention, it is possible to realize a lighting device and a vehicular lamp that can appropriately perform a function as a warning light by a circuit configuration that can be realized inexpensively without mounting a microcomputer, for example.

1 is a block diagram of a vehicle lamp according to an embodiment of the present invention. It is explanatory drawing of operation|movement of the vehicle lamp of embodiment. It is a circuit diagram of the master lighting unit of the embodiment. It is a circuit diagram of the slave lighting unit of the embodiment.

Hereinafter, a vehicle lamp 1 according to an embodiment will be described with reference to the drawings.
FIG. 1 is a block diagram of a vehicle lamp 1 according to an embodiment. This vehicular lamp 1 is used as a warning light in an emergency vehicle such as an ambulance. Then, an example is provided in which two left and right light emitting portions are provided at the front end or the rear end of the roof of the vehicle.
In the embodiment, an example in which the light source of the warning light is an LED (Light Emitting Diode) will be described. However, the light source is not limited to the LED, and may be another semiconductor light emitting element such as a laser diode or an organic EL element, or a lamp light source such as an incandescent lamp, a halogen lamp, a discharge lamp, or a neon lamp.

The vehicular lamp 1 according to the embodiment as a warning light has two lighting units as a master lighting unit RH and a slave lighting unit LH.
The master lighting unit RH has a light emitting section 3M and a lighting circuit 2M. The slave lighting unit LH has a light emitting unit 3S and a lighting circuit 2S.
The master lighting unit RH is arranged, for example, on the right side of the roof of the vehicle, and the slave lighting unit LH is arranged on the left side of the roof of the vehicle.
In this example, it is assumed that the lighting circuit 2M and the light emitting section 3M are integrally arranged in the master lighting unit RH, and the lighting circuit 2S and the light emitting section 3S are integrally arranged in the slave lighting unit LH. The circuit 2M and the light emitting unit 3M, or the lighting circuit 2S and the light emitting unit 3S do not necessarily have to be integrally unitized. The lighting circuits 2M and 2S serve as the lighting device 2 for driving light emission.

Each of the lighting circuits 2M and 2S is composed of, for example, various electronic components arranged on the lighting circuit board.
Further, the light emitting units 3M and 3S are formed by disposing light sources (LEDs 50M and 50S) on the light source substrate.
In this example, it is assumed that the light emitting unit 3M has three LEDs 50M connected in series between the terminals 63 and 64 of the light source substrate, and the light emitting unit 3S has three LEDs 50S connected in series between the terminals 67 and 68 of another light source substrate. It is supposed to be connected.

The power supply voltage +B is supplied to the vehicle lamp 1 from the battery 90 of the vehicle.
In the lighting circuit 2M of the master lighting unit RH, terminals 41 and 42 are connected to the power supply line 100 and the ground line 101 by wiring, and in the lighting circuit 2M, the switch 91 is turned on and the power supply voltage +B is supplied. Accordingly, the light emitting section 3M is caused to blink and emit light (eg, triple flash).
In the lighting circuit 2S of the slave lighting unit LH, terminals 51 and 52 are wired and connected to the power supply line 100 and the ground line 101. In the lighting circuit 2S, the switch 91 is turned on and the power supply voltage +B is supplied. Accordingly, the light emitting unit 3S is caused to blink and emit light (for example, a triple flash synchronized with the light emitting unit 3M).
The terminal 43 of the lighting circuit 2M and the terminal 53 of the lighting circuit 2S are connected by the wiring 102, and the terminal 44 of the lighting circuit 2M and the terminal 54 of the lighting circuit 2S are connected by the wiring 103.

The lighting circuit 2M in the master lighting unit RH includes a first timing signal generator 21 (hereinafter referred to as "first signal generator 21"), a drive unit 22, a timing signal output unit 23, and a synchronization instruction signal output unit 24. ..
When the switch 91 is turned on and the supply of the power supply voltage +B is started, the first signal generation unit 21 defines a first timing signal TS1 (hereinafter, referred to as “first signal TS1”) that defines lighting timing as a triple flash. Generate.
The drive unit 22 supplies a drive current to the LED 50M of the light emitting unit 3M at a timing based on the first signal TS1. The terminals 61 and 62 on the drive unit 22 side are connected to the terminals 63 and 64 of the light emitting unit 3M, respectively. The drive unit 22 supplies a drive current through the route of terminal 61→terminal 63→three LEDs 50M→terminal 64→terminal 62→ground to cause each LED 50M to emit light.
The timing signal output unit 23 outputs the first signal TS1 generated by the first signal generation unit 21 from the terminal 43.
The synchronization instruction signal output unit 24 generates the synchronization instruction signal SS and outputs it from the terminal 44.

The lighting circuit 2S in the slave lighting unit LH includes a second timing signal generating section 31 (hereinafter referred to as "second signal generating section 31"), a driving section 32, a timing signal input section 33, and a synchronization instruction signal input section 34. ..
The timing signal input section 33 inputs, via the terminal 53, the first signal TS1 output from the timing signal output section 23 of the master lighting unit RH and supplied via the wiring 102. Then, the first signal TS1 is supplied to the second signal generator 31.
The synchronization instruction signal input unit 34 inputs, via the terminal 54, the synchronization instruction signal SS output from the synchronization instruction signal output unit 24 and supplied via the wiring 103. Then, the synchronization instruction signal SS is supplied to the second signal generator 31.
The second signal generation unit 31 generates a second timing signal TS2 (hereinafter referred to as “second signal TS2”) that defines the lighting timing of the triple flash. At this time, when the synchronization instruction signal SS is supplied, the second signal generation unit 31 generates the second signal TS2 as a signal synchronized with the first signal TS1 supplied from the timing signal input unit 32. on the other hand,
When the synchronization instruction signal SS is not supplied, the second signal generator 31 uniquely generates the asynchronous second signal TS2.
The drive unit 32 supplies a drive current to the LED 50S of the light emitting unit 3S at a timing based on the second signal TS2. The terminals 65 and 66 on the drive unit 32 side are connected to the terminals 67 and 68 of the light emitting unit 3S, respectively. The drive unit 32 supplies a drive current through a route of terminal 65→terminal 67→three LEDs 50S→terminal 68→terminal 66→ground to cause each LED 50S to emit light.

The following operation is performed in such a vehicle lamp 1.
FIG. 2A shows the lighting states of the voltages of the terminals 41 and 51, the first signal TS1, the second signal TS2, and the light emitting units 3M and 3S when the master lighting unit RH and the slave lighting unit LH both normally blink. There is.
In the master lighting unit RH, when the supply of the power supply voltage +B to the terminal 41 is started, the first signal generator 21 starts generating the first signal TS1. The first signal TS1 is, for example, a signal having a cycle T1 (for example, T1=400 ms), and three H-level periods of T2 time (for example, T2=40 ms) occurring three times in the first half of the cycle. In the latter half of the cycle, the L level is maintained for a predetermined time in order to obtain a stop period in which blinking is stopped.

The drive unit 22 supplies a drive current to the light emitting unit 3M during the H level period of the first signal TS1. Therefore, the light emitting unit 3M continuously emits light three times in the cycle T1 based on the first signal TS1, that is, emits light as a triple flash.
In the slave lighting unit LH as well, when the supply of the power supply voltage +B to the terminal 51 is started, the second signal generation unit 31 starts generating the second signal TS2. In this case, the second signal TS2 synchronized with the first signal TS1 is generated in response to the input of the synchronization instruction signal SS and the first signal TS1. The drive unit 32 supplies a drive current to the light emitting unit 3S during the H level period of the second signal TS2. Therefore, the light emitting section 3S continuously emits light three times in the cycle T1 based on the second signal TS2, that is, emits light as a triple flash.
As a result, the light emitting units 3M and 3S synchronously perform triple flash light emission.

On the other hand, in FIG. 2B, when the power supply voltage +B is not supplied to the master lighting unit RH side due to disconnection or disconnection of the cable on the master lighting unit RH side, the voltages of the terminals 41 and 51, the first signal TS1, and the second signal TS2, The lighting states of the light emitting units 3M and 3S are shown.
In the master lighting unit RH, the power supply voltage +B is not supplied to the terminal 41. Therefore, the first signal generating unit 21 and the driving unit 22 do not operate, and the light emitting unit 3M does not blink. Also, the timing signal output unit 23 and the synchronization instruction signal output unit 24 do not operate.
In the slave lighting unit LH, when the supply of the power supply voltage +B to the terminal 51 is started, the second signal generator 31 starts generating the second signal TS2. In this case, the second signal generator 31 uniquely generates the second signal TS2 in response to the synchronization instruction signal SS and the first signal TS1 not being input. The cycle and waveform of the second signal TS2 are similar to those of the first signal TS1.
The drive unit 32 supplies a drive current to the light emitting unit 3S during the H level period of the second signal TS2. Therefore, the light emitting section 3S continuously emits light three times in the cycle T1 based on the second signal TS2, that is, emits light as a triple flash.
As a result, only the light emitting section 3S of the slave lighting unit LH emits triple flash light.

When the power supply voltage +B is not supplied to the slave lighting unit LH side due to disconnection or disconnection of the cable on the slave lighting unit LH side, conversely, only the light emitting unit 3M on the master lighting unit RH side performs triple flash light emission. Become.
That is, the operation of the terminal 41, the first signal TS1, and the light emitting section 3M is as shown in FIG. 2A, while the slave lighting unit LH side does not operate because the power supply voltage +B is not supplied.

A concrete circuit example of such a vehicle lamp 1 is shown in FIGS.
FIG. 3 shows the lighting circuit 2M and the light emitting section 3M of the master lighting unit RH.
In the drive unit 22, an input stage of the power supply voltage +B is formed by the filter capacitors C1 and C2 inserted between the terminal 41 (power supply line 100) and the terminal 42 (ground line 101) and the reverse connection prevention diode D1. It

The drive unit 22 is also provided with an operating voltage generation unit 73 that generates an operating voltage VCC for each circuit. The operating voltage generator 73 has a transistor TR1 which is an NPN type bipolar transistor, a resistor R9, capacitors C13 and C14, and a Zener diode ZD3.
The collector of the transistor TR1 is connected to the cathode side of the diode D1. A capacitor C13 is connected between the collector of the transistor TR1 and the ground, and a resistor R9 is connected between the collector and base of the transistor TR1. The Zener diode ZD3 is connected between the base of the transistor TR1 and the ground. The capacitor C14 is connected between the emitter of the transistor TR1 and the ground.
With this configuration, the power supply voltage +B is supplied to the terminal 41, the terminal voltage of the capacitor C13 rises, and the Zener diode ZD3 becomes conductive, so that the base current of the transistor TR1 flows and the operating voltage VCC is generated at the positive terminal of the capacitor C14. To be done.

Further, the drive unit 22 is provided with a constant current IC 72 for supplying a drive current, resistors R1 and R8 and capacitors C4 and C6 which form a peripheral circuit thereof. The capacitor C4 is connected as a filter capacitor between the input line of the power supply voltage +B and the ground, and the capacitor C6 is connected as a filter capacitor between the output end of the constant current IC 76 and the ground.
The voltage across the resistor R1 provided as a shunt resistor for the power supply voltage +B is input to the terminal VIN_F and the terminal VIN of the constant current IC72, whereby the constant current IC72 detects the current for the constant current. Then, the constant drive current is output from the terminal IOUT.
The first signal TS1 is input to the terminal CRT. The constant current IC 72 is configured to output a constant current while the input of the terminal CRT is at H level.

The first signal generation unit 21 is configured to include a timing signal generation IC 71 and capacitors C18, C23 and resistors R14, R17, R19 as external elements for the timing signal generation IC 71.
The operating voltage VCC is supplied to the terminal V of the timing signal generation IC 71.
The terminal OUT of the timing signal generation IC 71 is an output terminal of the first signal TS1.
The terminal PWMIN of the timing signal generation IC 71 is used as an input terminal for an external synchronization signal, but since the first signal generation unit 21 does not perform external synchronization, it is only connected to the resistor R14 and is not particularly used.
The terminal M/S of the timing signal generation IC 71 is a terminal that designates the master side or the slave side. In this case, the terminal M/S is connected to the line of the operating voltage VCC via the resistor R17 to set the terminal voltage. This defines the timing signal generation IC 75 to operate in the master mode. Specifically, the timing signal generation IC 71 outputs the first signal TS1 from the terminal OUT, which sets the triple flash timing in response to the supply of the operating voltage VCC to the terminal V, without external synchronization. Will work with. In this case, the period T1 of the first signal TS1 is determined by the capacitance value of the capacitor C23 connected to the terminal OSC and the resistance value of the resistor R19 connected to the terminal R.

The timing signal output unit 23 has resistors R12, R13, R20, a transistor TR3 which is an NPN type bipolar transistor, a diode D2, and a capacitor C24.
The connection point of the resistors R12 and R13 is connected to the base of the transistor TR3. The resistor R12 is connected to the terminal OUT of the timing signal generation IC 71.
The emitter of the transistor TR3 is connected to the ground, and the collector is connected to the resistor R20. The other end of the resistor R20 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the terminal 43. The capacitor C24 is inserted between the terminal 43 and the ground.
In the case of this configuration, the transistor TR3 is turned on while the first signal TS1 is at the H level, and the transistor TR3 is turned off while the first signal TS1 is at the L level.
During the OFF period of the transistor TR3, the voltage of the terminal 43 becomes H level by charging the capacitor C24 from the outside (charging is performed by the current from the timing signal input unit 33 described later). On the other hand, while the transistor TR3 is ON, the capacitor C24 is discharged, and the voltage of the terminal 43 drops. Therefore, the first signal TS1 appears at the terminal 43 in the inverted state.

The synchronization instruction signal output unit 24 has a resistor R23, a diode D5, and a capacitor C27. The resistor R23 is connected to the line of the operating voltage VCC. The other end of the resistor R23 is connected to the anode of the diode D5, and the cathode of the diode D5 is connected to the terminal 44. The capacitor C27 is inserted between the terminal 44 and the ground.
Therefore, when the power supply voltage +B is supplied and the operating voltage VCC is generated, a predetermined voltage appears at the terminal 44 as the terminal voltage of the capacitor C27. This is the synchronization instruction signal SS.

FIG. 4 shows the lighting circuit 2S and the light emitting section 3S of the slave lighting unit LH. It should be noted that elements having the same functions as those of FIG.
The configuration of the drive unit 32 is similar to that of the drive unit 22 of the master lighting unit RH. The drive unit 32 also has an operation voltage generation unit 73 that generates the operation voltage VCC of each circuit, and is configured to supply a drive current to the light emitting unit 3S by the constant current IC 72.

The second signal generation unit 31 has a timing signal generation IC 71 that is the same IC as the first signal generation unit 21. However, in the case of the second signal generating section 31, the first signal TS1 from the timing signal input section 33 is supplied to the terminal PWMIN of the timing signal generating IC 71. A signal from the synchronization instruction signal input unit 34 is input to the terminal M/S of the timing signal generation IC 71.

The synchronization instruction signal input unit 34 has a transistor TR5 which is an NPN type bipolar transistor, resistors R17, R18 and R22, a diode D4, and a capacitor C26.
The collector of the transistor TR5 is connected to the line of the operating voltage VCC via the resistor R17 and is also connected to the terminal M/S of the timing signal generation IC 71. The emitter of the transistor TR5 is connected to the ground.
A resistor R18 is connected between the base of the transistor TR5 and the ground. The base of the transistor TR5 is connected to the resistor R22, the other end of the resistor R22 is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the terminal 54. A capacitor C26 is inserted between the terminal 54 and the ground.

The terminal 54 is connected to the terminal 44 shown in FIG. Therefore, when the synchronization instruction signal SS from the synchronization instruction signal output unit 24 of FIG. 3 is obtained as the terminal voltage of the terminal 44, the terminal voltage of the terminal 54 (input of the synchronization instruction signal SS) in the synchronization instruction signal input unit 34. As a result, a base current flows through the transistor TR5, and the transistor TR5 is turned on. Then, the terminal M/S of the timing signal generation IC 71 becomes L level. This serves as an instruction input for the timing signal generation IC 71 to operate in the slave mode.
On the other hand, when the master lighting unit RH side of FIG. 3 is not operating without being supplied with the power supply voltage +B, the voltage of the terminal 44 (terminal 54) decreases (the synchronization instruction signal SS is not input). In that case, the transistor TR5 is turned off, and as a result, the operating voltage VCC and the voltage defined by the resistor R17 are applied to the terminal M/S of the timing signal generation IC 71. This serves as an instruction input for operating in the master mode similarly to the timing signal generation IC 71 on the master lighting unit RH side described above.

The timing signal input unit 33 includes a transistor TR4 which is a PNP type bipolar transistor, resistors R14, R15, R16 and R21, a diode D3, and a capacitor C25.
The resistors R15 and R14 are connected in series between the collector of the transistor TR4 and the ground, and the connection point of the resistors R15 and R14 is connected to the terminal PWMIN of the timing signal generation IC 71.
The emitter of the transistor TR4 is connected to the line of the operating voltage VCC. A resistor R16 is connected between the base and emitter of the transistor TR4. The base of the transistor TR4 is connected to the resistor R21, the other end of the resistor R21 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the terminal 53. A capacitor C25 is inserted between the terminal 53 and the ground.

The terminal 53 is connected to the terminal 43 in FIG. 3, and therefore, when the master lighting unit RH side is operating normally, the inverted first signal TS1 is supplied to the terminal 53.
During the L level period of the inverted first signal TS1, the base current flows from the operating voltage VCC through the diode D3, and the transistor TR4 is turned on. Therefore, at this time, the voltage of the terminal PWMIN of the timing signal generation IC 71 becomes H level. Further, during the H level period of the inverted first signal TS1, the transistor TR4 is turned off, so that the voltage of the terminal PWMIN of the timing signal generation IC 71 becomes the L level. That is, the original first signal TS1 is input to the terminal PWMIN.

With this configuration, when the master lighting unit RH operates normally and the synchronization instruction signal SS is supplied, the timing signal generation IC 71 operates in the slave mode and synchronizes with the first signal TS1 input to the terminal PWMIN. 2 signal TS2 is generated.
On the other hand, when the master lighting unit RH is not in operation, the synchronization instruction signal SS is not supplied to the terminal M/S, so the timing signal generation IC 71 is in the master mode. At this time, the timing signal generation IC 71 outputs from the terminal OUT the second signal TS2 that sets the timing of the triple flash in response to the operating voltage VCC being supplied to the terminal V, without performing external synchronization. In this case, the period T1 of the second signal TS2 is determined by the capacitance value of the capacitor C23 connected to the terminal OSC and the resistance value of the resistor R19 connected to the terminal R.

When the slave lighting unit LH is not operating, the master lighting unit RH side normally operates.
From the above,
(1) Synchronized triple flash light emission in the master lighting unit RH and slave lighting unit LH (2) Triple flash light emission only in the slave lighting unit LH when the master lighting unit RH is inoperative (3) Slave lighting unit LH Triple flash light emission of only the master lighting unit RH when not in operation is automatically executed according to the situation.

In the above embodiment, the following effects can be obtained.
The lighting device 2 of the embodiment includes a lighting circuit 2M that drives the light emitting unit 3M to emit light, and a lighting circuit 2S that drives the light emitting unit 3S to emit light.
The lighting circuit 2M causes the light emitting unit 3M to flash and emit light based on the first signal TS1 that defines the flashing emission timing, and the lighting circuit 2S synchronizes with the first signal TS1 when the first signal TS1 is supplied. Two signals TS2 are generated, and when the first signal TS1 is not supplied, the second signal TS2 is generated, and the light emitting unit 2S blinks and emits light based on the generated second signal TS2.
For example, when the lighting circuit 2M is on the master (parent) side and the lighting circuit 2S is on the slave (child) side, the lighting circuit 2S outputs a second signal TS2 synchronized with the first signal TS1 or an asynchronous second independent signal TS2. The light emitting section 3S is driven based on the above.
With this configuration, the synchronous/asynchronous control can be performed on the slave side with a simple circuit configuration, and the operations (1), (2), and (3) described above can be performed. That is, in the normal state, the light emitting units 3M and 3S blink in synchronism with each other, and when any of the light emitting units 3M and 3S does not illuminate, the one that can be illuminated blinks at its own timing.
Therefore, with a simple circuit configuration, it is possible to realize a lamp that automatically and synchronously blinks the two light emitting units 2M and 2S in a normal state and independently blinks in an abnormal state.

In addition, in the embodiment, the first signal TS1 is a signal that defines a light emitting operation in which a blinking period in which blinking is performed a plurality of times and a stop period in which blinking is stopped for a predetermined time are alternately repeated (see FIG. 2). Specifically, it is a timing signal that regulates light emission as a triple flash. This makes it possible to realize a suitable light emitting operation as a warning light for an emergency vehicle.

Further, in the embodiment, the lighting circuit 2M includes the first signal generation unit 21 that generates the first signal TS1, the synchronization instruction signal output unit 24 that outputs the synchronization instruction signal SS, and the timing signal that outputs the first signal TS1. And an output unit 23. The lighting circuit 2S includes a synchronization instruction signal input unit 34 that inputs the synchronization instruction signal SS from the lighting circuit 2M, a timing signal input unit 33 that inputs the first signal TS1 from the lighting circuit 2M, and a synchronization instruction signal input unit 34. The second signal TS2 synchronized with the first signal TS1 or the second signal generator 31 for generating the asynchronous second signal TS2 in accordance with the input.
That is, in the lighting circuit 2S, the second signal generation unit 31 switches the generation of the second signal TS2 synchronized with the first signal TS1 and the generation of the asynchronous second independent signal TS2 according to the synchronization instruction signal SS. I shall.
With this configuration, synchronous/asynchronous control can be performed on the slave side without performing synchronous/asynchronous control using a microcomputer.
Therefore, it is possible to perform an appropriate light emission operation as a plurality of blinking light emissions, for example, a warning light emission, with an inexpensive and simple circuit configuration.

Further, the synchronization instruction signal SS is a signal of a predetermined voltage generated based on the input power supply voltage in the lighting circuit 2M (see the synchronization instruction signal output unit 24 in FIG. 3).
In the lighting circuit 2M, the operating voltage Vcc of each circuit portion is generated based on the input power supply voltage +B, and the operating voltage VCC is used as the synchronization instruction signal.
As a result, when the power supply voltage +B input to the lighting circuit 2M becomes abnormal and the lighting circuit 2M does not operate normally and the light emitting unit 3M is not lit, the lighting circuit 2S asynchronously drives the light emitting unit 3S to emit light. can do.
Further, since it is not necessary to specially generate the synchronization instruction signal SS, simplification of the circuit configuration and cost reduction can be promoted.

A vehicular lamp 1 according to the present invention is a vehicular lamp that is provided at a front end portion or a rear end portion of a vehicle and is arranged in a pair on the left and right. One of the left and right lamps includes a light emitting unit 3M and a lighting circuit 2M. The light emitting unit 2S and the lighting circuit 3S are provided on the other lamp on the left and right. The same IC is used for the first signal generator 21 in the lighting circuit 2M and the second signal generator 31 in the lighting circuit 2S. That is, it is the timing signal generation IC 71 shown in FIGS. This makes it possible to improve the efficiency of parts and reduce costs.
In the timing signal generation IC 71, the timing signal cycle as the first signal TS1 and the second signal TS2 is defined by the externally attached capacitor C23 and the resistor R19. Therefore, even when only the slave blinks, the slave can have the same cycle as the blinking on the master side.

In addition, although the embodiment has been described as having two lighting units RH and LR, the present invention can also be applied to three or more lighting units. In that case, one may be a master lighting unit and the other lighting units may be slave lighting units.
Further, in the master lighting unit RH, the first signal generator 21 self-generates the first signal TS1. However, for example, a configuration in which the first signal TS1 is received from an ECU (Electronic Control Unit) on the vehicle side may be considered.
The vehicular lamp according to the present invention may be provided in a pair on the left and right on the roof of the vehicle, or a pair may be provided on the front end and the rear end of the vehicle.

DESCRIPTION OF SYMBOLS 1... Vehicle lamp, 2... Lighting device, 2M, 2S... Lighting circuit, 3M, 3S... Light emitting part, 21... 1st signal generating part (1st timing signal generating part), 22... Driving part, 23... Timing signal Output section, 24... Synchronization instruction signal output section, 31... Second signal generating section (second timing signal generating section), 32... Driving section, 33... Synchronization instruction signal input section, 34... Timing signal input section, 71... Timing Signal generation IC, 72... Constant current IC, 73... Operating voltage generation unit, RH... Master lighting unit, LH... Slave lighting unit, SS... Synchronization instruction signal, TS1... First signal (first timing signal), TS2... 2 signals (second timing signal)

Claims (5)

A first signal generator that generates a first signal that defines a blinking light emission timing ;
A synchronization instruction signal output unit that outputs a synchronization instruction signal,
A signal output unit that outputs the first signal,
A first drive unit that causes the first light emitting unit to blink based on the first signal;
A first lighting circuit having
A synchronization instruction signal input section for inputting the synchronization instruction signal from the first lighting circuit;
A signal input section for inputting the first signal from the first lighting circuit;
When the operation mode is set according to the input of the synchronization instruction signal input unit and the first signal is supplied, the second signal synchronized with the first signal is generated, and the first signal is not supplied. A second signal generator for generating an asynchronous second signal ;
A second driving unit for causing the second light emitting unit to blink based on the second signal generated by the second signal generating unit;
A second lighting circuit having
A first wiring connecting the signal output unit and the signal input unit;
A second wiring connecting the synchronization instruction signal output unit and the synchronization instruction signal input unit;
Lighting device equipped with. The synchronization instruction signal is a signal of a predetermined voltage generated based on the input power supply voltage in the first lighting circuit.
The lighting device according to claim 1. The synchronization instruction signal is an operating voltage that drives an IC used in the first signal generator.
The lighting device according to claim 1 or 2. The first signal is a signal that defines a light emitting operation in which a blinking period in which blinking is performed a plurality of times and a stop period in which the blinking is stopped for a predetermined time are alternately repeated.
The lighting device according to any one of claims 1 to 3. A vehicular lamp which is provided at a front end portion or a rear end portion of a vehicle and is arranged in a pair of left and right,
The first light emitting unit and the first lighting circuit according to claim 1 are provided in one of the left and right lamps,
The second light emitting unit and the second lighting circuit according to claim 1 are provided in the other lamp on the left and right.
The vehicular lamp in which the same IC is used for the first signal generating section and the second signal generating section.

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