JP2017120689A - Lighting device and lamp fitting for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a lamp fitting operating suitably as an alarm lamp for an emergency vehicle with a simple circuit.SOLUTION: A lighting device includes a first lighting circuit for driving a first light emitting portion to emit light, and a second lighting circuit for driving a second light emitting portion to emit light. The first lighting circuit blinks the first light emitting portion on the basis of a first signal defining a blinking light emission timing. When the first signal is supplied, the second lighting circuit generates a second signal synchronized with the first signal, and when no first signal is supplied, the second lighting circuit asynchronously generates the second signal, and blinks the second light emitting portion on the basis of the generated second signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device and a vehicular lamp, and more particularly to a technical field of a lamp that causes a plurality of lighting units to blink in synchronization.

JP 2000-91092 A

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

The warning lamp performs a light emission operation that periodically blinks, for example, as a triple flash. For example, when such a blinking is performed with a plurality of warning lights, it is necessary that the lighting timings of the warning lights are synchronized.
Further, if one warning light cannot be lit due to disconnection of the cable or the like, it is necessary to perform a blinking operation using only the other warning light.
In order to perform such control of flashing synchronously and each warning light flashing independently, a microcomputer is usually mounted on the lighting circuit 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.
Accordingly, an object of the present invention is to realize a function as a warning lamp with a circuit configuration that can be realized at low cost.

The lighting device according to the present invention includes a first lighting circuit that causes the first light emitting unit to flash and emit light based on a first signal that defines flashing and 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-emitting element, generates a second signal when the first signal is not supplied, and blinks the second light-emitting unit based on the generated second signal With.
That is, the first lighting circuit is the master (parent) side, and the second lighting circuit is the slave (child) side. The second lighting circuit drives the second light emitting unit based on a second signal (second timing signal) synchronized with the first signal (first timing signal) or an asynchronous independent second signal.

In the lighting device described above, the first signal may be a signal that prescribes 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 an alarm lamp for an emergency vehicle.

In the lighting device described above, the first lighting circuit includes a first signal generation 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, wherein the second lighting circuit receives a synchronization instruction signal input unit that inputs the synchronization instruction signal from the first lighting circuit, and the first signal from the first lighting circuit. And a second signal generation unit that generates a second signal that is synchronized with the first signal or an asynchronous second signal in accordance with an input of the synchronization instruction signal input unit. 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 independent second signal. This switching is made according to the synchronization instruction signal from the first lighting circuit.

In the lighting device described above, the synchronization instruction signal may be a signal having a predetermined voltage generated based on an input power supply voltage in the first lighting circuit.
The first lighting circuit generates an operating voltage or the like for 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 at a front end portion or a rear end portion of a vehicle and is arranged in a pair of left and right. 1 lighting circuit is provided, and the second light emitting unit and the second lighting circuit described above are provided in the other of the right and left lamps. The first signal generator and the second signal generator are assumed to use the same IC.
That is, a vehicle lamp using the first and second light emitting units and the first and second lighting circuits as the left and right lamps is realized. In this case, by using the same IC for the first signal generation unit and the second signal generation unit, the efficiency of parts and cost reduction are achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting device and vehicle lamp which can exhibit the function as a warning lamp appropriately are realizable by the circuit structure which can be implement | achieved cheaply, for example, without mounting a microcomputer.

It is a block diagram of the vehicular lamp of an embodiment of the 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 an embodiment. It is a circuit diagram of the slave lighting unit of the embodiment.

Hereinafter, a vehicular lamp 1 according to an embodiment will be described with reference to the drawings.
FIG. 1 is a block diagram of a vehicular lamp 1 according to an embodiment. The vehicle lamp 1 is used as a warning light in an emergency vehicle such as an ambulance. An example in which two right and left 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, which is a warning lamp, has two lighting units as a master lighting unit RH and a slave lighting unit LH.
The master lighting unit RH includes a light emitting unit 3M and a lighting circuit 2M. The slave lighting unit LH includes a light emitting unit 3S and a lighting circuit 2S.
The master lighting unit RH is disposed on the right side on the roof of the vehicle, for example, and the slave lighting unit LH is disposed on the left side on the roof of the vehicle.
In this example, the lighting circuit 2M and the light emitting unit 3M are integrally disposed in the master lighting unit RH, and the lighting circuit 2S and the light emitting unit 3S are integrally disposed 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 are not necessarily unitized. The lighting circuits 2M and 2S serve as the lighting device 2 for driving light emission.

The lighting circuits 2M and 2S are each composed of various electronic components arranged on the lighting circuit board, for example.
The light emitting units 3M and 3S are formed by arranging light sources (LEDs 50M and 50S) on a light source substrate.
In this example, 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 in series between the terminals 67 and 68 of the other light source substrates. It is assumed that it is connected.

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

The lighting circuit 2M in the master lighting unit RH includes a first timing signal generation unit 21 (hereinafter referred to as “first signal generation unit 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. Is generated.
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 a 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 TS <b> 1 generated by the first signal generation unit 21 from the terminal 43.
The synchronization instruction signal output unit 24 generates a 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 generation unit 31 (hereinafter referred to as “second signal generation unit 31”), a drive unit 32, a timing signal input unit 33, and a synchronization instruction signal input unit 34. .
The timing signal input unit 33 inputs the first signal TS <b> 1 output from the timing signal output unit 23 of the master lighting unit RH and supplied via the wiring 102 via the terminal 53. Then, the first signal TS1 is supplied to the second signal generator 31.
The synchronization instruction signal input unit 34 inputs the synchronization instruction signal SS output from the synchronization instruction signal output unit 24 and supplied via the wiring 103 via the terminal 54. Then, the synchronization instruction signal SS is supplied to the second signal generator 31.
The second signal generator 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 independently generates an 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.

In such a vehicular lamp 1, the following operation is performed.
FIG. 2A shows the lighting state of the voltage of the terminals 41 and 51, the first signal TS1, the second signal TS2, and the light emitting units 3M and 3S as the case where both the master lighting unit RH and the slave lighting unit LH normally blink and emit light. Yes.
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 period T1 (for example, T1 = 400 ms) and an H level period of T2 time (for example, T2 = 40 ms) generated three times in the first half of the period. During the latter half of the cycle, the L level is maintained for a predetermined time in order to obtain a stop period for stopping the blinking.

The drive unit 22 supplies a drive current to the light emitting unit 3M during the H level period of the first signal TS1. Accordingly, the light emitting unit 3M performs continuous lighting three times with a period T1 based on the first signal TS1, that is, light emission as a triple flash.
Even 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 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 unit 3S performs continuous lighting three times with a period T1 based on the second signal TS2, that is, light emission as triple flash.
As a result, the light emitting units 3M and 3S perform triple flash light emission in synchronization.

On the other hand, FIG. 2B shows a case where the power supply voltage + B is not supplied to the master lighting unit RH due to disconnection or disconnection of the master lighting unit RH, and the voltages of the terminals 41 and 51, the first signal TS1, the second signal TS2, The lighting state of the light emitting units 3M and 3S is shown.
In the master lighting unit RH, the power supply voltage + B is not supplied to the terminal 41. For this reason, the 1st signal generation part 21 and the drive part 22 do not operate | move, and the light emission part 3M does not blink light emission. Further, 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, in response to the absence of the synchronization instruction signal SS and the first signal TS1, the second signal generation unit 31 independently generates the second signal TS2. The cycle and waveform of the second signal TS2 are the same as 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 unit 3S performs continuous lighting three times with a period T1 based on the second signal TS2, that is, light emission as triple flash.
Thereby, only the light emission part 3S of the slave lighting unit LH performs triple flash light emission.

If the power supply voltage + B is not supplied to the slave lighting unit LH due to disconnection or disconnection of the slave lighting unit LH, only the light emitting unit 3M on the master lighting unit RH side performs triple flash emission. Become.
That is, the operation of the terminal 41, the first signal TS1, and the light emitting unit 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 specific circuit example of such a vehicular lamp 1 is shown in FIGS.
FIG. 3 shows the lighting circuit 2M and the light emitting unit 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. The

The driving unit 22 is provided with an operating voltage generating unit 73 that generates the operating voltage VCC of each circuit. The operating voltage generation unit 73 includes a transistor TR1, which is an NPN 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. A zener diode ZD3 is connected between the base of the transistor TR1 and the ground. A 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, whereby the base current of the transistor TR1 flows, and the operating voltage VCC is generated at the positive terminal of the capacitor C14. Is done.

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 that form peripheral circuits 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 terminal of the constant current IC 76 and the ground.
The voltage at both ends of the resistor R1 provided as the shunt resistor for the power supply voltage + B is input to the terminal VIN_F and the terminal VIN of the constant current IC 72, whereby the constant current IC 72 performs current detection for making the current constant. 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 during a period when the input of the terminal CRT is at the H level.

The first signal generation unit 21 includes a timing signal generation IC 71 and capacitors C18 and C23 and resistors R14, R17, and R19 as external elements.
The operating voltage VCC is supplied to the terminal V of the timing signal generation IC 71.
A terminal OUT of the timing signal generation IC 71 is an output terminal of the first signal TS1.
Although the terminal PWMIN of the timing signal generation IC 71 is used as an input terminal for an external synchronization signal, the first signal generation unit 21 does not perform external synchronization, and therefore is not particularly used because only the resistor R14 is connected.
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. Thus, the timing signal generation IC 75 is defined to perform the master mode operation. Specifically, the timing signal generation IC 71 outputs the first signal TS1 that sets the triple flash timing from the terminal OUT in response to the operating voltage VCC being supplied to the terminal V without any external synchronization. Will work with. The period T1 of the first signal TS1 in this case 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 includes resistors R12, R13, and R20, a transistor TR3 that is an NPN-type bipolar transistor, a diode D2, and a capacitor C24.
The connection point between 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 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 at the terminal 43 becomes H level due to external charging of the capacitor C24 (charging by a current from a timing signal input unit 33 described later is performed). On the other hand, during the period in which the transistor TR3 is ON, the capacitor C24 is discharged, and the voltage at the terminal 43 decreases. Therefore, the first signal TS1 appears in the terminal 43 in an inverted state.

The synchronization instruction signal output unit 24 includes a resistor R23, a diode D5, and a capacitor C27. Resistor R23 is connected to the line of 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 unit 3S of the slave lighting unit LH. Note that elements having the same functions as those in FIG.
The configuration of the drive unit 32 is the same as 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 supplies a drive current to the light emitting unit 3S by the constant current IC 72.

  The second signal generation unit 31 includes 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 generation unit 31, the first signal TS1 from the timing signal input unit 33 is supplied to the terminal PWMIN of the timing signal generation IC 71. In addition, 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 includes a transistor TR5, which is an NPN-type bipolar transistor, resistors R17, R18, 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 by 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 is 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 in FIG. 3 is not operating without being supplied with the power supply voltage + B, the voltage at the terminal 44 (terminal 54) decreases (the synchronization instruction signal SS is not input). In this case, the transistor TR5 is turned off, and as a result, the voltage defined by the operating voltage VCC and the resistor R17 is applied to the terminal M / S of the timing signal generation IC 71. This is an instruction input for operating in the master mode, similar 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 bipolar transistor, resistors R14, R15, R16, and R21, a diode D3, and a capacitor C25.
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 of 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 via the diode D3, and the transistor TR4 is turned on. Accordingly, 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 at the terminal PWMIN of the timing signal generation IC 71 is at the L level. That is, the original first signal TS1 is input to the terminal PWMIN.

With this configuration, the timing signal generation IC 71 operates as a slave mode when the master lighting unit RH operates normally and is supplied with the synchronization instruction signal SS, and is synchronized with the first signal TS1 input to the terminal PWMIN. Two signals TS2 are generated.
On the other hand, when the master lighting unit RH is not operating, the synchronization instruction signal SS is not supplied to the terminal M / S, so that 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 for setting the triple flash timing in response to the operating voltage VCC being supplied to the terminal V without external synchronization. The period T1 of the second signal TS2 in this case 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 operates normally.
With the above,
(1) Triple flash emission synchronized between the master lighting unit RH and the slave lighting unit LH (2) Triple flash emission only of the slave lighting unit LH when the master lighting unit RH is inactive (3) The slave lighting unit LH Triple flash 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 according to 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 blink and emit light based on the first signal TS1 that defines the blinking light emission timing, and the lighting circuit 2S is synchronized with the first signal TS1 when the first signal TS1 is supplied. When the first signal TS1 is not supplied, the second signal TS2 is generated, and the light emitting unit 2S blinks 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 generates a second signal TS2 synchronized with the first signal TS1 or an asynchronous independent second signal TS2. Based on this, the light emitting unit 3S is driven.
With this configuration, synchronous / asynchronous control on the slave side can be performed 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 synchronously. If any of the light emitting units 3M and 3S is not lit, the one that can be lit blinks at a unique timing.
Therefore, with a simple circuit configuration, it is possible to realize a lamp that automatically blinks the two light emitting units 2M and 2S synchronously in a normal state and flashes independently in an abnormal state.

  In the embodiment, the first signal TS1 is a signal that prescribes a light emission operation that alternately repeats 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 (see FIG. 2). Specifically, it is a timing signal that defines light emission as a triple flash. As a result, a suitable light emitting operation as a warning light for an emergency vehicle can be realized.

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 generator 31 generates a second signal TS2 that is synchronized with the first signal TS1 or an asynchronous second signal TS2.
That is, in the lighting circuit 2S, the second signal generator 31 switches between generation of the second signal TS2 synchronized with the first signal TS1 and generation of the asynchronous independent second signal TS2 in accordance with the synchronization instruction signal SS. Shall.
With this configuration, synchronous / asynchronous control on the slave side is possible without performing synchronous / asynchronous control using a microcomputer.
Accordingly, it is possible to perform an appropriate light emitting operation as a plurality of blinking light emission, for example, warning light emission, with an inexpensive and simple circuit configuration.

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).
The lighting circuit 2M generates the operating voltage Vcc of each circuit portion based on the input power supply voltage + B, and uses the operating voltage VCC as a synchronization instruction signal.
As a result, when the power supply voltage + B input to the lighting circuit 2M becomes abnormal, the lighting circuit 2M does not operate normally, and the light emitting unit 3M is not lit, the lighting circuit 2S drives the light emitting unit 3S to emit light asynchronously. can do.
Further, since it is not necessary to generate the synchronization instruction signal SS specially, 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 of left and right. A light emitting unit 3M and a lighting circuit 2M are provided on one of the left and right lamps. The light emitting part 2S and the lighting circuit 3S are provided in the other lamp on the left and right. The first 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, the timing signal generation IC 71 shown in FIGS. As a result, it is possible to improve the efficiency and cost of parts.
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 external 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 the embodiment, the two lighting units RH and LR have been described. However, the present invention can be applied to three or more lighting units. In that case, one may be a master lighting unit, and the other lighting unit may be a slave lighting unit.
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 a vehicle-side ECU (Electronic Control Unit) or the like is also conceivable.
The vehicular lamps according to the present invention may be provided in a pair of left and right on the vehicle roof, or may be provided in a pair at the front end portion and the rear end portion of the vehicle.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 2 ... Lighting apparatus, 2M, 2S ... Lighting circuit, 3M, 3S ... Light emission part, 21 ... 1st signal generation part (1st timing signal generation part), 22 ... Drive part, 23 ... Timing signal Output unit, 24 ... synchronization instruction signal output unit, 31 ... second signal generator (second timing signal generator), 32 ... drive unit, 33 ... synchronization instruction signal input unit, 34 ... timing signal input unit, 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 ... first 2 signals (second timing signal)

Claims (5)

A first lighting circuit that causes the first light-emitting unit to flash and emit light based on a first signal that defines the flashing and lighting timing;
When the first signal is supplied, a second signal synchronized with the first signal is generated. When the first signal is not supplied, a second signal is generated. Based on the generated second signal A lighting device comprising: a second lighting circuit that causes the second light emitting unit to flash and emit light. The lighting device according to claim 1, wherein the first signal is a signal that prescribes a light emitting operation that alternately repeats 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. The first lighting circuit includes:
A first signal generator for generating the first signal;
A synchronization instruction signal output unit for outputting a synchronization instruction signal;
A signal output unit that outputs the first signal;
The second lighting circuit includes:
A synchronization instruction signal input unit for inputting the synchronization instruction signal from the first lighting circuit;
A signal input unit for inputting the first signal from the first lighting circuit;
3. A second signal generation unit that generates a second signal synchronized with the first signal or an asynchronous second signal in accordance with an input of the synchronization instruction signal input unit. The lighting device described. The lighting device according to claim 3, wherein the synchronization instruction signal is a signal having a predetermined voltage generated based on an input power supply voltage in the first lighting circuit. It is a vehicular lamp that is provided at the front end or rear end of the vehicle and is arranged in a pair of left and right,
The first light-emitting unit and the first lighting circuit according to claim 3 or claim 4 are provided in one of the right and left lamps,
The second light-emitting unit and the second lighting circuit according to claim 3 or claim 4 are provided in the other lamp of the left and right,
The first signal generation unit and the second signal generation unit use the same IC.

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