JP6604574B2 - Lighting device and vehicle - Google Patents

Description

  The present invention relates to a lighting device and a vehicle including the lighting device.

  As a conventional example, a lighting device described in Patent Document 1 is illustrated. The lighting device described in Patent Document 1 lights a plurality of LEDs (light emitting diodes) connected in series. A plurality of switch circuits are electrically connected in parallel to each of the plurality of LEDs in a one-to-one correspondence. The lighting device includes a step-up / down converter circuit that supplies DC power to a plurality of LEDs. Further, the lighting device includes a microcomputer control unit that individually opens and closes the plurality of switch circuits. That is, when the microcomputer control unit closes the switch circuit, the LED can be turned off by short-circuiting between the anode and cathode of the LED connected in parallel with the switch circuit. If the microcomputer control unit opens the switch circuit, the LED can be lit by opening the anode and cathode of the LED.

JP 2014-170880 A

  By the way, the lighting device described in Patent Document 1 requires the same number of wires connecting the switch circuit and the microcomputer control unit as the switch circuit. On the other hand, an increase in the number of wires increases the cost and increases the occurrence rate of failures such as disconnection. For this reason, the configuration of the lighting device described in Patent Document 1 is not sufficient to reduce wiring.

  An object of the present invention is to provide a lighting device and a vehicle that can reduce wiring.

  A lighting device according to one embodiment of the present invention includes a power supply unit and a plurality of light source units. The power supply unit outputs DC power from a first output terminal and a second output terminal, and the DC power is periodically changed into a first power value and a second power value smaller than the first power value. It is comprised so that it may switch to. The plurality of light source units are electrically connected between the first output terminal and the second output terminal. Each of the plurality of light source units includes one or more solid-state light emitting elements, a switch for turning on / off the supply of the DC power to the one or more solid-state light emitting elements, and switch control for controlling on / off of the switches Department. Each of the plurality of switch control units included in the plurality of light source units on a one-to-one basis is configured as follows. That is, each of the plurality of switch control units is configured to detect the state of one or more of the solid state light emitting elements in the first period. The two solid state light emitting elements include self solid state light emitting elements respectively included in the plurality of light source units among the plurality of solid state light emitting elements included in the plurality of light source units. The first period is a period in which DC power having the first power value is supplied. In addition, each of the plurality of switch control units is in the second period, and the state of the switch that is turned on or off according to the detection result of the state of the one or more solid state light emitting elements in the immediately preceding first period. Is maintained and inverted. The second period is a period in which DC power having the second power value is supplied.

  A vehicle according to an aspect of the present invention includes the lighting device and a vehicle body on which the lighting device is mounted.

  The lighting device and the vehicle of the present invention have an effect that wiring saving can be achieved.

FIG. 1 is a circuit configuration diagram of a lighting device according to Embodiment 1 of the present invention. FIG. 2 is a time chart for explaining the operation of the lighting device. FIG. 3 is a circuit configuration diagram of a lighting device according to Embodiment 2 of the present invention. FIG. 4 is a circuit configuration diagram of a lighting device according to Embodiment 3 of the present invention. FIG. 5 is a time chart for explaining the operation of the lighting device according to the third embodiment. FIG. 6 is a perspective view of a vehicle according to an embodiment of the present invention.

  Hereinafter, a lighting device and a vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings. In more detail, the lighting device according to the following embodiment is a lighting device configured to switch lighting states of a plurality of light sources in a predetermined order. Further, the vehicle according to the following embodiment is a vehicle having a vehicle body on which the lighting device according to the embodiment is mounted. The configurations described in the following embodiments are merely examples of the present invention. The present invention is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

(Embodiment 1)
A lighting device 1X according to Embodiment 1 of the present invention (hereinafter, abbreviated as a lighting device 1X) includes a power supply unit 2 and a plurality (five in the illustrated example) of light source units, as shown in FIG. Yes. In the following description, the five light source units are referred to as a first light source unit 3A, a second light source unit 3B, a third light source unit 3C, a fourth light source unit 3D, and a fifth light source unit 3E.

  The power supply unit 2 includes a first output terminal 20 and a second output terminal 21. The power supply unit 2 converts the DC power input from the DC power supply 10 into desired DC power and outputs it from the first output terminal 20 and the second output terminal 21. The DC power supply 10 is, for example, an in-vehicle storage battery (battery). The power supply unit 2 outputs a DC output current Io in a direction from the first output terminal 20 serving as the positive electrode toward the second output terminal 21 serving as the negative electrode. The power supply unit 2 is preferably composed of a switching power supply circuit, for example. The power supply unit 2 is configured to be able to adjust the output current Io by PWM (pulse width modulation) control. The power supply unit 2 preferably includes an output switch 22 that opens and closes an electric path from the switching power supply circuit to the first output terminal 20. The power supply unit 2 is configured to output the output current Io from the first output terminal 20 by closing the output switch 22 and stop outputting the output current Io by opening the output switch 22. However, the power supply unit 2 may be configured to switch between output and stop of the output current Io by switching between operation and stop of the switching power supply circuit instead of opening and closing the output switch 22.

  Of the five light source units 3A to 3E, the four light source units 3B to 3E excluding the first light source unit 3A have a completely common configuration. Further, the first light source unit 3A has a configuration common to the other four light source units 3B to 3E except for some configurations.

  The first light source unit 3 </ b> A is directly and electrically connected to the first output terminal 20 of the power supply unit 2. The first light source unit 3A includes a first LED (light emitting diode) 30A that is a solid light emitting element, a first switch 31A, and a first switch control unit 32A. The anode of the first LED 30 </ b> A and one end of the first switch 31 </ b> A are electrically connected to the first output terminal 20 of the power supply unit 2. Further, the cathode of the first LED 30A and the other end of the first switch 31A are electrically connected. That is, the first LED 30A and the first switch 31A are electrically connected in parallel. Accordingly, the first LED 30A emits light (lights up) when the first switch 31A is off, and emits light (lights up). When the first switch 31A is on, the output current Io flows through the first switch 31A. Therefore, it does not emit light (lights up). Therefore, the lighting state (lighting and extinguishing) of the first LED 30A is switched by turning on / off the first switch 31A. The first switch 31A is preferably composed of a semiconductor switching element such as a field effect transistor.

  The first switch control unit 32A preferably includes a first drive circuit 320A, a first holding unit 321A, a first determination unit 322A, a first inverter 323A, a first timer 324A, and the like. The first drive circuit 320A is preferably a D flip-flop circuit with a set / reset terminal, for example. The first drive circuit 320A turns on the first switch 31A by setting the voltage (output voltage) of the output terminal Q to a high level, and turns off the first switch 31A by setting the output voltage to a low level. The first determination unit 322A determines the state (lighting and extinguishing) of the first LED 30A. For example, the first determination unit 322A preferably determines the state of the first LED 30A by detecting the voltage across the first LED 30A, the current flowing through the first LED 30A, or the amount of light of the first LED 30A. However, the first determination unit 322A may indirectly determine the state of the first LED 30A by detecting the state (on, off) of the first switch 31A. The first determination unit 322A is configured to set the output to a high level when the first LED 30A is turned on and to set the output to a low level when the first LED 30A is turned off. The output of the first determination unit 322A is held by the first holding unit 321A. The first holding unit 321A is configured to hold the output state immediately before switching after the output of the first determination unit 322A switches from high level to low level and from low level to high level. The output of the first holding unit 321A is input to the input terminal D of the first drive circuit 320A.

  The clock terminal CK of the first drive circuit 320A is electrically connected to the output terminal of the first inverter 323A. The first inverter 323A sets the output to a low level when the output current Io flows through the first light source unit 3A, and sets the output to a high level when the output current Io does not flow. That is, when the output switch 22 of the power supply unit 2 is turned off and the output current Io becomes zero, the input voltage of the clock terminal CK of the first drive circuit 320A rises to a high level.

  The first timer 324A counts an elapsed time starting from when the output switch 22 of the power supply unit 2 is turned off and the output current Io becomes zero. Further, when the elapsed time reaches a predetermined threshold value Tw, the first timer 324A raises the input voltage of the reset terminal R of the first drive circuit 320A to a high level.

  When the input voltage at the clock terminal CK rises to a high level, the first drive circuit 320A sets the output voltage to a high level if the input voltage at the input terminal D is at a high level, and outputs if the input voltage is at a low level. Set the voltage to low level. Further, the first drive circuit 320A sets the output voltage to low level when the input voltage of the reset terminal R rises to high level.

  The second light source unit 3B includes a second LED (light emitting diode) 30B that is a solid light emitting element, a second switch 31B, and a second switch control unit 32B. The second LED 30B is electrically connected in series with the first LED 30A. The second switch 31B is electrically connected in parallel with the second LED 30B. Therefore, the second LED 30B emits light (lights up) when the second switch 31B is off, and emits light (lights up). When the second switch 31B is on, the output current Io flows through the second switch 31B. Therefore, it does not emit light (lights up). Therefore, the lighting state (lighting and extinguishing) of the second LED 30B is switched by turning on / off the second switch 31B. The second switch 31B is preferably composed of a semiconductor switching element such as a field effect transistor.

  The second switch control unit 32B preferably includes a second drive circuit 320B, a second holding unit 321B, a second determination unit 322B, a second inverter 323B, a second timer 324B, and the like. The second drive circuit 320B is preferably a D flip-flop circuit with a set / reset terminal, for example. The second drive circuit 320B turns on the second switch 31B by setting the voltage (output voltage) of the output terminal Q to a high level, and turns off the second switch 31B by setting the output voltage to a low level.

  The second determination unit 322B preferably detects the state of the first LED 30A and the state of the second LED 30B, and performs a logical operation on each detection result. The second determination unit 322B is preferably composed of a knot gate and an OR gate. The input voltage of the knot gate is at a high level when the first LED 30A is turned on, and is at a low level when the first LED 30A is turned off. The OR gate calculates the logical sum of the output of the knot gate and the state of the second LED 30B. That is, the output (or gate output) of the second determination unit 322B is at a high level when the second LED 30B is turned on and when the first LED 30A is turned off. In addition, the output of the second determination unit 322B (output of the OR gate) becomes low level when the second LED 30B is turned off and the first LED 30A is turned on. The output of the second determination unit 322B is held by the second holding unit 321B.

  The second holding unit 321B is configured to hold the output state immediately before switching after the output of the second determination unit 322B switches from high level to low level and from low level to high level. The output of the second holding unit 321B is input to the input terminal D of the second drive circuit 320B.

  The clock terminal CK of the second drive circuit 320B is electrically connected to the output terminal of the second inverter 323B. The second inverter 323B sets the output to a low level when the output current Io flows through the second light source unit 3B, and sets the output to a high level when the output current Io does not flow. That is, when the output switch 22 of the power supply unit 2 is turned off and the output current Io becomes zero, the input voltage of the clock terminal CK of the second drive circuit 320B rises to a high level.

  The second timer 324B counts an elapsed time starting from the time when the output switch 22 of the power supply unit 2 is turned off and the output current Io becomes zero. Further, when the elapsed time reaches the threshold value Tw, the second timer 324B raises the input voltage of the set terminal S of the second drive circuit 320B to a high level.

  When the input voltage at the clock terminal CK rises to a high level, the second drive circuit 320B sets the output voltage to a high level if the input voltage at the input terminal D is at a high level, and outputs if the input voltage is at a low level. Set the voltage to low level. Further, the second drive circuit 320B sets the output voltage to the high level when the input voltage of the set terminal S rises to the high level.

  The third light source unit 3C includes a third LED (light emitting diode) 30C, which is a solid light emitting element, a third switch 31C, and a third switch control unit 32C. The fourth light source unit 3D includes a fourth LED (light emitting diode) 30D that is a solid light emitting element, a fourth switch 31D, and a fourth switch control unit 32D. Further, the fifth light source unit 3E includes a fifth LED (light emitting diode) 30E that is a solid light emitting element, a fifth switch 31E, and a fifth switch control unit 32E. The third LED 30C, the fourth LED 30D, and the fifth LED 30E are electrically connected in series with the first LED 30A and the second LED 30B. Further, the cathode of the fifth LED 30E is electrically connected to the second output terminal 21 of the power supply unit 2. That is, the first LED 30A, the second LED 30B, the third LED 30C, the fourth LED 30D, and the fifth LED 30E are electrically connected in series with the first output terminal 20 and the second output terminal 21 of the power supply unit 2.

  The third switch 31C is electrically connected in parallel with the third LED 30C. Accordingly, the third LED 30C emits light (lights up) when the third switch 31C is off, and emits light (lights up). When the third switch 31C is on, the output current Io flows through the third switch 31C. Therefore, it does not emit light (lights up). Therefore, the lighting state (lighting and extinguishing) of the third LED 30C is switched by turning on and off the third switch 31C.

  The fourth switch 31D is electrically connected in parallel with the fourth LED 30D. Therefore, the fourth LED 30D emits light (lights up) when the fourth switch 31D is off and emits light (lights up), and when the fourth switch 31D is on, the output current Io flows through the fourth switch 31D. Therefore, it does not emit light (lights up). Therefore, the lighting state (lighting and extinguishing) of the fourth LED 30D is switched by turning on / off the fourth switch 31D.

  The fifth switch 31E is electrically connected in parallel with the fifth LED 30E. Therefore, the fifth LED 30E emits light (lights up) when the fifth switch 31E is off, and emits light (lights up). When the fifth switch 31E is on, the output current Io flows through the fifth switch 31E. Therefore, it does not emit light (lights up). Therefore, the lighting state (lighting and extinguishing) of the fifth LED 30E is switched by turning on / off the fifth switch 31E. Note that the third switch 31C, the fourth switch 31D, and the fifth switch 31E are all preferably formed of a semiconductor switching element such as a field effect transistor.

  The third switch control unit 32C, the fourth switch control unit 32D, and the fifth switch control unit 32E have the same configuration as the second switch control unit 32B of the second light source unit 3B. However, it is preferable that the third determination unit 322C detects the state of the second LED 30B and the state of the third LED 30C, and performs a logical operation on each detection result. The output of the third determination unit 322C is at a high level when the third LED 30C is turned on and when the second LED 30B is turned off. In addition, the output of the third determination unit 322C is at a low level when the third LED 30C is turned off and the second LED 30B is turned on. Moreover, it is preferable that 4th determination part 322D detects the state of 3rd LED30C, and the state of 4th LED30D, and performs the logical operation of each detection result. The output of the fourth determination unit 322D becomes a high level when the fourth LED 30D is turned on and when the third LED 30C is turned off. In addition, the output of the fourth determination unit 322D is at a low level when the fourth LED 30D is turned off and the third LED 30C is turned on. Furthermore, it is preferable that the fifth determination unit 322E detects the state of the fourth LED 30D and the state of the fifth LED 30E and performs a logical operation on each detection result. The output of the fifth determination unit 322E is at a high level when the fifth LED 30E is turned on and when the fourth LED 30D is turned off. In addition, the output of the fifth determination unit 322E is at a low level when the fifth LED 30E is turned off and the fourth LED 30D is turned on.

  In the five holding units of the first holding unit 321A to the fifth holding unit 321E, the time for holding the outputs of the five determining units of the first to determining unit 322A to the fifth determining unit 322E is the following two conditions: It is preferable that the time is satisfied for both. The first condition is that the time from when the voltage at the clock terminal CK of each of the five drive circuits 320A to 320E rises to the time when the output voltage at each output terminal Q of the five drive circuits 320A to 320E changes. It ’s a long time. The second condition is that it is shorter than the threshold value of each of the five timers 324A to 324E.

  Next, the operation of the lighting device 1X will be described with reference to the circuit diagram of FIG. 1 and the time chart of FIG.

  For example, the power supply unit 2 turns off the output switch 22 until a trigger signal is input from the outside, and turns on the output switch 22 to supply the output current Io when the trigger signal is input. Before the trigger signal is input (before time t = t1), a high level voltage is input from the first timer 324A of the first light source unit 3A to the reset terminal R of the first drive circuit 320A. Therefore, the first drive circuit 320A turns off the first switch 31A by setting the output voltage to a low level. On the other hand, a high level voltage is input from the second timer 324B of the second light source unit 3B to the set terminal S of the second drive circuit 320B. Therefore, the second drive circuit 320B turns on the second switch 31B by setting the output voltage to a high level. A high level voltage is input from the third timer 324C of the third light source unit 3C to the set terminal S of the third drive circuit 320C. Therefore, the third drive circuit 320C turns on the third switch 31C by setting the output voltage to a high level. A high level voltage is input from the fourth timer 324D of the fourth light source unit 3D to the set terminal S of the fourth drive circuit 320D. Therefore, the fourth drive circuit 320D turns on the fourth switch 31D by setting the output voltage to a high level. A high level voltage is input from the fifth timer 324E of the fifth light source unit 3E to the set terminal S of the fifth drive circuit 320E. Therefore, the fifth drive circuit 320E turns on the fifth switch 31E by setting the output voltage to a high level. In the following description, the above-described state is referred to as an initial state of the lighting device 1X.

  When the trigger signal is input, the power supply unit 2 turns on the output switch 22 to switch the current value of the output current Io from the second current value I2 (I2 = 0) to the first current value I1 (I1> 0) ( Time t = t1). In the initial state, the first LED 30A is lit because the first switch 31A is off. On the other hand, since the second switch 31B, the third switch 31C, the fourth switch 31D, and the fifth switch 31E are on, the second LED 30B, the third LED 13C, the fourth LED 30D, and the fifth LED 30E are all turned off. In the initial state, the input voltage at the input terminal D of the first drive circuit 320A is at a high level. In the initial state, since the first LED 30A is turned on and the second LED 30B is turned off, the input voltage at the input terminal D of the second drive circuit 320B is at a low level. Furthermore, since the second LED 30B to the fourth LED 30D are turned off in the initial state, the input voltages at the input terminals D of the third drive circuit 320C to the fifth drive circuit 320E are at a high level.

  The power supply unit 2 turns on / off the output switch 22 at a constant first period (first period Ts + second period Td). Therefore, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t1), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t2). When the current value of the output current Io becomes the second current value I2, the voltages of the clock terminals CK of the first drive circuit 320A to the fifth drive circuit 320E rise to a high level. Further, all of the first LED 30A to the fifth LED 30E are turned off. At this time, the input voltages of the input terminals D of the first driving circuit 320A to the fifth driving circuit 320E are set to the first period Ts (time t = t1 to t1) immediately before by the first holding unit 321A to the fifth holding unit 321E. The state of t2) is maintained. Therefore, in the second period Td (after time t = t2), the input voltages at the input terminals D of the first drive circuit 320A and the third drive circuit 320C to the fifth drive circuit 320E are each at a high level. In the second period Td (after time t = t2), the input voltage at the input terminal D of the second drive circuit 320B is at a low level.

  When the second period Td elapses from the time when the output switch 22 is turned off (time t = t2), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t3). Then, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t3), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t4). In the first period Ts (time t = t3 to t4), since the first switch 31A and the third switch 31C to the fifth switch 31E are turned on, the first LED 30A and the third LED 31C to the fifth LED 30E are turned off. On the other hand, in the first period Ts (time t = t3 to t4), since the second switch 31B is turned off, the second LED 30B is lit.

  When the first period Ts elapses from the time when the output switch 22 is turned on (time t = t3), the power supply unit 2 turns off the output switch 22 and changes the current value of the output current Io from the first current value I1 to the second current value. Switch to I2 (time t = t4). When the current value of the output current Io becomes the second current value I2, the voltages of the clock terminals CK of the first drive circuit 320A to the fifth drive circuit 320E rise to a high level. Further, all of the first LED 30A to the fifth LED 30E are turned off. At this time, the input voltages of the input terminals D of the first driving circuit 320A to the fifth driving circuit 320E are set to the first period Ts (time t = t3 to the previous time) by the first holding unit 321A to the fifth holding unit 321E. The state is maintained at t4). Therefore, in the second period Td (after time t = t4), the input voltages at the input terminals D of the first drive circuit 320A and the third drive circuit 320C are each at a low level. In the second period Td (after time t = t4), the input voltages at the input terminals D of the second drive circuit 320B, the fourth drive circuit 320D, and the fifth drive circuit 320E are at a high level.

  When the second period Td elapses from the time point when the output switch 22 is turned off (time t = t4), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t5). Then, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t5), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t6). In the first period Ts (time t = t5 to t6), the second switch 31B, the fourth switch 31D, and the fifth switch 31E are turned on, so that the second LED 31B, the fourth LED 30D, and the fifth LED 30E are turned off. On the other hand, in the first period Ts (time t = t5 to t6), the first switch 31A and the third switch 31C are turned off, so that the first LED 30A and the third LED 30C are lit.

  When the first period Ts elapses from when the output switch 22 is turned on (time t = t5), the power supply unit 2 turns off the output switch 22 and changes the current value of the output current Io from the first current value I1 to the second current value. Switch to I2 (time t = t6). When the current value of the output current Io becomes the second current value I2, the voltages of the clock terminals CK of the first drive circuit 320A to the fifth drive circuit 320E rise to a high level. Further, all of the first LED 30A to the fifth LED 30E are turned off. At this time, the input voltages of the input terminals D of the first drive circuit 320A to the fifth drive circuit 320E are set to the first period Ts (time t = t5 to the previous time) by the first holding unit 321A to the fifth holding unit 321E. The state is maintained at t6). Therefore, in the second period Td (after time t = t6), the input voltages at the input terminals D of the second drive circuit 320B and the fourth drive circuit 320D are each at a low level. In the second period Td (after time t = t6), the input voltages at the input terminals D of the first drive circuit 320A, the third drive circuit 320C, and the fifth drive circuit 320E are at a high level.

  When the second period Td elapses from the time when the output switch 22 is turned off (time t = t6), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t7). The power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t7), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t8). In the first period Ts (time t = t7 to t8), the first switch 31A, the third switch 31C, and the fifth switch 31E are turned on, so the first LED 31A, the third LED 30C, and the fifth LED 30E are turned off. On the other hand, in the first period Ts (time t = t7 to t8), the second switch 31B and the fourth switch 31D are turned off, so that the second LED 30B and the fourth LED 30D are lit.

  When the first period Ts elapses from the time when the output switch 22 is turned on (time t = t7), the power supply unit 2 turns off the output switch 22 and changes the current value of the output current Io from the first current value I1 to the second current value. Switch to I2 (time t = t8). When the current value of the output current Io becomes the second current value I2, the voltages of the clock terminals CK of the first drive circuit 320A to the fifth drive circuit 320E rise to a high level. Further, all of the first LED 30A to the fifth LED 30E are turned off. At this time, the input voltages of the input terminals D of the first driving circuit 320A to the fifth driving circuit 320E are set to the first period Ts (time t = t7 to the previous time) by the first holding unit 321A to the fifth holding unit 321E. The state is maintained at t8). Therefore, in the second period Td (after time t = t8), the input voltages at the input terminals D of the first drive circuit 320A, the third drive circuit 320C, and the fifth drive circuit 320E are each at a low level. In the second period Td (after time t = t8), the input voltages at the input terminals D of the second drive circuit 320B and the fourth drive circuit 320D are at a high level.

  When the second period Td elapses from the time point when the output switch 22 is turned off (time t = t8), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t9). Then, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t9), and changes the current value of the output current Io from the first current value I1 to the second value. Switch to current value I2. In the first period Ts (after time t = t9), the second switch 31B and the fourth switch 31D are turned on, so that the second LED 31B and the fourth LED 30D are turned off. On the other hand, in the first period Ts (after time t = t9), the first switch 31A, the third switch 31C, and the fifth switch 31E are turned off, so that the first LED 30A, the third LED 30C, and the fifth LED 30E are lit.

  Furthermore, the power supply unit 2 is configured to be longer than the first period from the time when the trigger signal is input (time t = t1) when the output switch 22 is turned off after the first period Ts has elapsed (time t = t10). If two cycles To have elapsed, the second period Td is extended. At this time, the power supply unit 2 extends the second period Td to a time longer than the threshold value Tw. In addition, it is preferable that the second period To is, for example, a period that is several times to several tens of times the first period, or a period that is several tens of times.

  The power supply unit 2 turns on the output switch 22 when the extended second period (hereinafter referred to as the third period Tr) has elapsed (time t = t11) from when the output switch 22 was turned off (time t = t10). Then, the current value of the output current Io is switched from the second current value I2 to the first current value I1. In the third period Tr, the elapsed time counted by the first timer 324A to the fifth timer 324E exceeds the threshold value Tw. Accordingly, since a high level voltage is input from the first timer 324A to the reset terminal R of the first drive circuit 320A, the output voltage of the first drive circuit 320A becomes a low level. Further, a high level voltage is input from the second timer 324B to the fifth timer 324E to the set terminals S of the second drive circuit 320B to the fifth drive circuit 320E, respectively. Therefore, each output voltage of the second drive circuit 320B to the fifth drive circuit 320E becomes a high level. That is, the lighting device 1X returns to the initial state. When the third period Tr elapses, the power supply unit 2 turns on the output switch 22 to switch the current value of the output current Io from the second current value I2 to the first current value I1 (time t = t11). Since it has returned to the initial state, the first LED 30A is turned on and the second LED 30B to the fifth LED 30E are all turned off. Thereafter, the power supply unit 2 turns the output switch 22 on and off at the timing described above. That is, the state where the first LED 30A is turned on, the second LED 30B is turned on, the first LED 30A and the third LED 30C are turned on, the second LED 30B and the fourth LED 30D are turned on, and the first LED 30A, the third LED 30C, and the fifth LED 30E are turned on periodically. However, the order in which the first LED 30A to the fifth LED 30E blinks is not limited to the order described above. For example, the first determination unit 322A to the fifth determination unit 322E may be a combination of light sources (first LED 30A to fifth LED 30E) that determine the lighting state. It can be changed accordingly. Further, the threshold values Tw of the first timer 324A to the fifth timer 324E need not all be the same, and the threshold value Tw of at least one of the timers is different from the threshold values of the other timers. May be. For example, the threshold value Tw of the first timer 324A to the third timer 324C is the first threshold value, and the threshold values Tw of the fourth timer 324D and the fifth timer 324E are larger (longer). ) It may be the second threshold value. In this case, in the lighting device 1X, the power supply unit 2 sets the extension time of the second period Td to be longer than the first threshold value and shorter than the second threshold value and to be longer than the second threshold value. By adjusting to a long time, the blinking order of the first LED 30A to the fifth LED 30E can be changed.

  As described above, the lighting device 1X causes the five light source units 3A to 3E to blink in a predetermined order by periodically switching the direct current (output current Io) supplied from the power supply unit 2 into two types, large and small. it can. In other words, the lighting device 1X includes only two electric wires for power supply, and the power source unit 2 and the five light source units 3A to 3E are connected, and a control signal line or the like is required for each of the plurality of light source units 3A to 3E. do not do. Therefore, the lighting device 1X can save wiring.

  Here, the lighting device 1X sets the second current value I2 of the output current Io to zero by turning off the output switch 22, but the second current value I2 is larger than zero and is greater than the first current value I1. The predetermined value may be a reduced value. For example, the predetermined value is preferably a value lower than a current value or an output voltage value that can maintain lighting of the first LED 30A to the fifth LED 30E. In this case, it is preferable that the power supply unit 2 periodically switches the output current Io between the first current value I1 and the second current value I2 by adjusting the output by PWM control instead of turning the output switch 22 on and off.

  In addition, the lighting device 1X causes the first LED 30A to the fifth LED 30E to blink smoothly by setting the second period Td to a time that is short enough for a person not to recognize that the first LED 30A to the fifth LED 30E are all turned off. Can do. In this case, the second period Td is preferably, for example, several milliseconds to tens of milliseconds. The input voltages at the clock terminals CK of the first driving circuit 320A to the fifth driving circuit 320E rise from a low level to a high level when the output current Io switches from the first current value I1 to the second current value I2, respectively. . However, the output voltages of the first determination unit 322A to the fifth determination unit 322E may be input to the clock terminals CK of the first drive circuit 320A to the fifth drive circuit 320E.

  Note that the power supply unit 2 may not be configured to switch the output by a trigger signal input from the outside. For example, the power supply unit 2 may be configured to switch the output by a periodic pulse signal output from an oscillation unit built in the power supply unit 2.

  As described above, the lighting device 1X includes the power supply unit 2 and the plurality of light source units 3A to 3E. The power supply unit 2 is configured to output DC power (output current Io) from the first output terminal 20 and the second output terminal 21. Furthermore, the power supply unit 2 converts the DC power (output current Io) into a first power value (first current value I1) and a second power value (second current) that is smaller than the first power value (first current value I1). It is configured to periodically switch to the current value I2). The plurality of light source units 3 </ b> A to 3 </ b> E are electrically connected between the first output terminal 20 and the second output terminal 21. Each of the plurality of light source units 3A to 3E includes one or a plurality of solid light emitting elements (first LED 30A to fifth LED 30E). Each of the plurality of light source units 3A to 3E includes switches 31A to 31E for turning on / off the supply of DC power (DC current Io) to one or a plurality of solid state light emitting elements (first LED 30A to fifth LED 30E). Furthermore, each of the plurality of light source units 3A to 3E includes switch control units 32A to 32E that control turning on / off of the switches 31A to 31E. The plurality of switch control units 32A to 32E provided in a one-to-one correspondence with the plurality of light source units 3A to 3E are configured as follows. That is, each of the plurality of switch control units 32A to 32E is configured to detect the state of one or more solid state light emitting elements in the first period Ts. These two solid-state light-emitting elements are self-equipped with the plurality of light source units 30A to 30E, respectively, among the plurality of solid-state light-emitting elements (first LED 30A to fifth LED 30E) included in the plurality of light source units 30A to 30E on a one-to-one basis. A solid state light emitting device is included. The first period Ts is a period in which DC power having a first power value (first current value I1) is supplied. Each of the plurality of switch control units 32A to 32E has a switch 31A that is turned on and off in the second period Td according to the detection result of the state of one or more solid state light emitting elements in the immediately preceding first period Ts. It is comprised so that the state of -31E may be maintained and reversed. The second period Td is a period in which DC power (output current Io) having the second power value (second current value I2) is supplied.

  If the lighting device 1X is configured as described above, the direct current (output current Io) supplied from the power supply unit 2 is periodically switched between two types, large and small, so that the plurality of light source units 3A to 3E are arranged in a predetermined order. Can be flashed. That is, the lighting device 1X requires only two electric wires for power supply, the power supply unit 2 and the plurality of light source units 3A to 3E are connected, and a control signal line or the like is required for each of the plurality of light source units 3A to 3E. do not do. As a result, the lighting device 1X can reduce wiring.

  Here, in the lighting device 1X, it is preferable that the power supply unit 2 is configured to extend the second period Td. Each of the plurality of switch control units 32A to 32E sets the states of the switches 31A to 31E to which the switch control units 32A to 32E are turned on and off at a predetermined initial time regardless of the detection result when the extended second period (third period Tr) ends. It is preferable to be configured to be in a state.

  If the lighting device 1X is configured as described above, when the second period Td is extended by the power supply unit 2, the lighting state of the plurality of light source units 3A to 3E returns to the initial state. 3E can be blinked easily and in various blinking sequences.

  In the lighting device 1X, the power supply unit 2 switches the DC power (output current Io) between the first power value (first current value I1) and the second power value (second current value I2) and outputs the cycle. It is preferable that the second period Td is extended with a longer period To.

  If the lighting device 1X is configured as described above, the plurality of light source units 3A to 3E can be easily and periodically blinked in various blinking orders.

  Furthermore, in the lighting device 1X, each of the plurality of switch control units 32A to 32E is configured to compare the time length of the extended second period (third period Tr) with a predetermined threshold value Tw. Is preferred. Further, each of the plurality of switch control units 32A to 32E sets the switch state in which the switch control unit 32A to 32E is turned on or off in a predetermined initial state when the length of the extended second period (third period Tr) exceeds the threshold value Tw. It is preferable to be configured to be in a state. The threshold value Tw preferably includes at least a first threshold value and a second threshold value different from the first threshold value. Each of the plurality of switch control units 32A to 32E is configured to compare the length of the extended second period (third period Tr) with either the first threshold value or the second threshold value. It is preferable.

  If the lighting device 1X is configured as described above, the plurality of light source units 3A to 3E can be easily blinked in various blinking orders.

  In the lighting device 1 </ b> X, it is preferable that the plurality of light source units 3 </ b> A to 3 </ b> E be electrically connected in series between the first output terminal 20 and the second output terminal 21.

  If the lighting device 1X is configured as described above, it is possible to perform constant power (constant current) control on the DC power (output current Io) supplied to the plurality of light source units 3A to 3E in the power supply unit 2.

  Furthermore, in the lighting device 1X, it is preferable that the power supply unit 2 is configured to set the second power value (second current value I2) to zero.

  If the lighting device 1X is configured as described above, the power value (current value) of the DC power (output current Io) in the power supply unit 2 can be easily changed.

(Embodiment 2)
A lighting device 1Y according to Embodiment 2 of the present invention (hereinafter abbreviated as a lighting device 1Y) includes a power supply unit 2 and a plurality (five in the illustrated example) of light source units, as shown in FIG. Yes. In the lighting device 1 </ b> Y, five light source units are electrically connected in parallel between the first output terminal 20 and the second output terminal 21 of the power supply unit 2. In the following description, the five light source units are referred to as a sixth light source unit 3F, a seventh light source unit 3G, an eighth light source unit 3H, a ninth light source unit 3I, and a tenth light source unit 3J. Further, the power supply unit 2 has a common configuration with the power supply unit 2 of the lighting device 1X of the first embodiment. Therefore, the detailed description regarding the power supply part 2 is abbreviate | omitted.

  Of the five light source units 3F to 3J, the four light source units 3G to 3J except for the sixth light source unit 3F have a completely common configuration. The sixth light source unit 3F has the same configuration as the other four light source units 3G to 3J, except for some configurations.

  The sixth light source unit 3F is directly and electrically connected to the first output terminal 20 of the power supply unit 2. The sixth light source unit 3F includes a sixth LED 30F that is a solid light emitting element (light emitting diode), a sixth switch 31F, a sixth switch control unit 32F, and a current limiting circuit 33F. The current limiting circuit 33F may be a resistance element or a constant current circuit. The anode of the sixth LED 30F is electrically connected to the first output terminal 20 of the power supply unit 2 via the sixth switch 31F and the current limiting circuit 33F. In addition, the cathode of the sixth LED 30 </ b> F is electrically connected to the second output terminal 21 of the power supply unit 2. That is, the sixth LED 30 </ b> F, the sixth switch 31 </ b> F, and the current limiting circuit 33 </ b> F are electrically connected in series to the first output terminal 20 and the second output terminal 21 of the power supply unit 2. Therefore, when the sixth switch 31F is on, the sixth LED 30F emits light (illuminates) when an output current Io (actually part of the output current Io, hereinafter the same) flows, and the sixth switch 31F is turned off. When the power is on, the output current Io does not flow, and therefore no light is emitted (lighted). Therefore, the lighting state (lighting and extinguishing) of the sixth LED 30F is switched by turning on / off the sixth switch 31F. The sixth switch 31F is preferably composed of a semiconductor switching element such as a field effect transistor.

  The sixth switch control unit 32F preferably includes a sixth drive circuit 320F, a sixth holding unit 321F, a sixth determination unit 322F, a sixth inverter 323F, a sixth timer 324F, and the like. The sixth drive circuit 320F is preferably a D flip-flop circuit with a set / reset terminal, for example. The sixth drive circuit 320F turns on the sixth switch 31F by setting the voltage (output voltage) of the output terminal Q to a high level, and turns off the sixth switch 31F by setting the output voltage to a low level. The sixth determination unit 322F determines the state (lighting and extinguishing) of the sixth LED 30F. For example, the sixth determination unit 322F preferably determines the state of the sixth LED 30F by detecting the voltage across the sixth LED 30F, the current flowing through the sixth LED 30F, or the amount of light of the sixth LED 30F. However, the sixth determination unit 322F may indirectly determine the state of the sixth LED 30F by detecting the state (ON, OFF) of the sixth switch 31F. The sixth determination unit 322F has a knot gate and sets the output to a low level when the sixth LED 30F is turned on, and sets the output to a high level when the sixth LED 30F is turned off. The output of the sixth determination unit 322F is held by the sixth holding unit 321F. The sixth holding unit 321F is configured to hold the output state immediately before switching after the output of the sixth determination unit 322F switches from high level to low level and from low level to high level. The output of the sixth holding unit 321F is input to the input terminal D of the sixth drive circuit 320F.

  The clock terminal CK of the sixth drive circuit 320F is electrically connected to the output terminal of the sixth inverter 323F. The sixth inverter 323F sets the output to a low level when the applied voltage at the input end of the sixth light source unit 3F is equal to or higher than a predetermined level due to the output voltage of the power supply unit 2, and outputs when the applied voltage is lower than the predetermined level. High level. That is, when the output switch 22 of the power supply unit 2 is turned off and the applied voltage to the light source units 3E to 3J becomes substantially zero, the input voltage of the clock terminal CK of the sixth drive circuit 320F rises to a high level.

  The sixth timer 324F counts the elapsed time starting from when the output switch 22 of the power supply unit 2 is turned off and the applied voltage to the light source units 3E to 3J becomes substantially zero. Furthermore, when the elapsed time reaches a predetermined threshold value Tw, the sixth timer 324F raises the input voltage of the set terminal S of the sixth drive circuit 320F to a high level.

  When the input voltage at the clock terminal CK rises to a high level, the sixth drive circuit 320F sets the output voltage to a high level if the input voltage at the input terminal D is at a high level, and outputs if the input voltage is at a low level. Set the voltage to low level. Further, the sixth drive circuit 320F sets the output voltage to high level when the input voltage of the set terminal S rises to high level.

  The seventh light source unit 3G includes a seventh LED 30G that is a solid state light emitting device, a seventh switch 31G, a seventh switch control unit 32G, and a current limiting circuit 33G. The current limiting circuit 33G may be a resistance element or a constant current circuit. The anode of the seventh LED 30G is electrically connected to the first output terminal 20 of the power supply unit 2 via the seventh switch 31G and the current limiting circuit 33G. The cathode of the seventh LED 30 </ b> G is electrically connected to the second output terminal 21 of the power supply unit 2. That is, the seventh LED 30G, the seventh switch 31G, and the current limiting circuit 33G are electrically connected in series to the first output terminal 20 and the second output terminal 21 of the power supply unit 2. Therefore, the seventh LED 30G emits light (lights up) when the seventh switch 31G is on, and emits light (lights up). When the seventh switch 31G is off, the seventh LED 30G emits light because the output current Io does not flow ( not light. Therefore, the lighting state (lighting and extinguishing) of the seventh LED 30G is switched by turning on / off the seventh switch 31G. The seventh switch 31G is preferably composed of a semiconductor switching element such as a field effect transistor.

  The seventh switch control unit 32G preferably includes a seventh drive circuit 320G, a seventh holding unit 321G, a seventh determination unit 322G, a seventh inverter 323G, a seventh timer 324G, and the like. The seventh drive circuit 320G is preferably a D flip-flop circuit with a set / reset terminal, for example. The seventh drive circuit 320G turns on the seventh switch 31G by setting the voltage (output voltage) of the output terminal Q to a high level, and turns off the seventh switch 31G by setting the output voltage to a low level.

  The seventh determination unit 322G preferably detects the state of the sixth LED 30F and the state of the seventh LED 30G, and performs a logical operation on each detection result. The seventh determination unit 322G is preferably configured with a knot gate and a NOR gate. The input voltage of the knot gate is at a high level when the sixth LED 30F is turned on, and is at a low level when the sixth LED 30F is turned off. The NOR gate calculates the negative OR of the output of the NOT gate and the state of the seventh LED 30G. That is, the output of the seventh determination unit 322G (the output of the NOR gate) becomes a high level when the seventh LED 30G is turned off and the sixth LED 30F is turned on. Further, the output of the seventh determination unit 322G (the output of the NOR gate) becomes a low level when the seventh LED 30G is turned on and when the sixth LED 30F is turned off. The output of the seventh determination unit 322G is held by the seventh holding unit 321G.

  The seventh holding unit 321G is configured to hold the output state immediately before switching after the output of the seventh determination unit 322G is switched from the high level to the low level and from the low level to the high level. The output of the seventh holding unit 321G is input to the input terminal D of the seventh drive circuit 320G.

  The clock terminal CK of the seventh drive circuit 320G is electrically connected to the output terminal of the seventh inverter 323G. The seventh inverter 323G sets the output to a low level when the applied voltage at the input terminal of the seventh light source unit 3G is equal to or higher than a predetermined level due to the output voltage of the power supply unit 2, and outputs when the applied voltage is lower than the predetermined level. High level. That is, when the output switch 22 of the power supply unit 2 is turned off and the applied voltage to the light source units 3E to 3J becomes substantially zero, the input voltage of the clock terminal CK of the seventh drive circuit 320G rises to a high level.

  The seventh timer 324G counts an elapsed time starting from the time when the output switch 22 of the power supply unit 2 is turned off and the applied voltage to the light source units 3E to 3J becomes substantially zero. Furthermore, when the elapsed time reaches the threshold value Tw, the seventh timer 324G raises the input voltage of the reset terminal R of the seventh drive circuit 320G to a high level.

  When the input voltage at the clock terminal CK rises to a high level, the seventh drive circuit 320G sets the output voltage to a high level if the input voltage at the input terminal D is at a high level, and outputs if the input voltage is at a low level. Set the voltage to low level. Further, the seventh drive circuit 320G sets the output voltage to low level when the input voltage of the reset terminal R rises to high level.

  The eighth light source unit 3H includes an eighth LED 30H that is a solid-state light emitting element, an eighth switch 31H, an eighth switch control unit 32H, and a current limiting circuit 33H. The eighth LED 30 </ b> H, the eighth switch 31 </ b> H, and the current limiting circuit 33 </ b> H are electrically connected in series between the first output terminal 20 and the second output terminal 21 of the power supply unit 2. The ninth light source unit 3I includes a ninth LED 30I that is a solid-state light emitting element, a ninth switch 31I, a ninth switch control unit 32I, and a current limiting circuit 33I. The ninth LED 30I, the ninth switch 31I, and the current limiting circuit 33I are electrically connected in series between the first output terminal 20 and the second output terminal 21 of the power supply unit 2. Furthermore, the 10th light source unit 3J is provided with 10th LED30J which is a solid light emitting element, 10th switch 31J, 10th switch control part 32J, and current limiting circuit 33J. The tenth LED 30J, the tenth switch 31J, and the current limiting circuit 33J are electrically connected in series between the first output terminal 20 and the second output terminal 21 of the power supply unit 2.

  The eighth LED 30H emits light (lights up) when the eighth switch 31H is on, and emits light (lights up). When the eighth switch 31H is off, the output current Io does not flow up and lights up (lights up). do not do. Therefore, the lighting state (turning on and off) of the eighth LED 30H is switched by turning on and off the eighth switch 31H.

  The ninth LED 30I emits light (lights up) when the ninth switch 31I is on, and emits light (lights up). When the ninth switch 31I is off, the ninth LED 31I emits light (lights up) because the output current Io does not flow. do not do. Therefore, the lighting state (lighting and extinguishing) of the ninth LED 30I is switched by turning on / off the ninth switch 31I.

  The tenth LED 30J emits light (lights up) when the tenth switch 31J is on, and emits light (lights up). When the tenth switch 31J is off, the output current Io does not flow, and emits light (lights up). do not do. Therefore, the lighting state (lighting and extinguishing) of the tenth LED 30J is switched by turning on and off the tenth switch 31J. Note that the eighth switch 31H, the ninth switch 31I, and the tenth switch 31J are all preferably formed of a semiconductor switching element such as a field effect transistor.

  The eighth switch control unit 32H, the ninth switch control unit 32I, and the tenth switch control unit 32J have the same configuration as the seventh switch control unit 32G of the seventh light source unit 3G. However, it is preferable that the 8th determination part 322H detects the state of 7th LED30G and the state of 8th LED30H, and performs the logical operation of each detection result. The output of the eighth determination unit 322H becomes a high level when the eighth LED 30H is turned off and the seventh LED 30G is turned on. Further, the output of the eighth determination unit 322H is at a low level when the eighth LED 30H is turned on and when the seventh LED 30G is turned off. The output of the eighth determination unit 322H is held by the eighth holding unit 321H. The output of the ninth determination unit 322I is at a high level when the ninth LED 30I is turned off and the eighth LED 30H is turned on. Furthermore, the output of the ninth determination unit 322I is at a low level when the ninth LED 30I is turned on and when the eighth LED 30H is turned off. The output of the ninth determination unit 322I is held by the ninth holding unit 321I. In addition, the output of the tenth determination unit 322J is at a high level when the tenth LED 30J is turned off and the ninth LED 30I is turned on. Further, the output of the tenth determination unit 322J is at a low level when the tenth LED 30J is turned on and when the ninth LED 30I is turned off. The output of the tenth determination unit 322J is held by the tenth holding unit 321J.

  The power supply unit 2 alternately repeats a first period Ts for turning on the output switch 22 and a second period Td for turning off the output switch 22. As a result, the sixth LED 30F is turned on, the seventh LED 30G is turned on, the sixth LED 30F and the eighth LED 30H are turned on, the seventh LED 30G and the ninth LED 30I are turned on, and the sixth LED 30F, the eighth LED 30H, and the tenth LED 30J are turned on periodically. The specific operation of the lighting device 1Y is basically the same as the operation of the lighting device 1X of the first embodiment, and thus detailed description thereof is omitted.

  The lighting device 1Y of this embodiment also switches the five light source units 3F to 3J in a predetermined order by periodically switching the DC power (output voltage or output current Io) supplied from the power supply unit 2 to two types of magnitude. Can be flashed. That is, the lighting device 1Y requires only two electric wires for power supply, the power source unit 2 and the five light source units 3F to 3J are connected, and a control signal line or the like is required for each of the plurality of light source units 3F to 3J. do not do. Therefore, the lighting device 1Y can save wiring.

  As described above, in the lighting device 1Y, the plurality of light source units 3F to 3J are preferably electrically connected in parallel between the first output terminal 20 and the second output terminal 21.

  If the lighting device 1Y is configured as described above, a normal light source unit can continue to be lit even if one of the light source units fails.

(Embodiment 3)
A lighting device 1Z according to Embodiment 3 of the present invention (hereinafter abbreviated as a lighting device 1Z) includes a power supply unit 2 and a plurality (four in the illustrated example) of light source units, as shown in FIG. Yes. The lighting device 1Z preferably includes one auxiliary light source unit 5 and an auxiliary power source 6. In the lighting device 1 </ b> Z, the auxiliary light source unit 5 and the four light source units are electrically connected in series between the first output terminal 20 and the second output terminal 21 of the power supply unit 2. In the following description, the four light source units are referred to as a first light source unit 4A, a second light source unit 4B, a third light source unit 4C, and a fourth light source unit 4D. Further, the power supply unit 2 has a common configuration with the power supply unit 2 of the lighting device 1X of the first embodiment. Therefore, the detailed description regarding the power supply part 2 is abbreviate | omitted.

  The auxiliary light source unit 5 includes an auxiliary LED light source 50 and a resistor 54. The auxiliary light source unit 5 preferably has an input terminal 51, an output terminal 52, and an auxiliary terminal 53. The input terminal 51 is electrically connected to the first output terminal 20 of the power supply unit 2. The auxiliary LED light source 50 is composed of a series circuit of two LEDs. The positive electrode (the anode of one LED) of the auxiliary LED light source 50 is electrically connected to the input terminal 51, the auxiliary terminal 53, and one end of the resistor 54. The negative electrode of the auxiliary LED light source 50 (the cathode of the other LED) is electrically connected to the output terminal 52 and the other end of the resistor 54.

  The first light source unit 4A, the second light source unit 4B, the third light source unit 4C, and the fourth light source unit 4D have a completely common configuration.

  The first light source unit 4A includes a first LED light source 40A, a first switch 41A, and a first switch control unit 42A. The first light source unit 4A includes a first input terminal 43A, a first output terminal 44A, a first auxiliary terminal 45A, a first feed terminal 46A, and a first power supply terminal 47A. The first input terminal 43 </ b> A is electrically connected to the output terminal 52 of the auxiliary light source unit 5. The first auxiliary terminal 45 </ b> A is electrically connected to the auxiliary terminal 53 of the auxiliary light source unit 5. The first power supply terminal 47A is electrically connected to the positive electrode of the auxiliary power supply 6.

  The first LED light source 40A is composed of a series circuit of two LEDs. The positive electrode (the anode of one LED) of the first LED light source 40A is electrically connected to the first input terminal 43A and the first feed terminal 46A. The negative electrode of the first LED light source 40A (the cathode of the other LED) is electrically connected to the first output terminal 44A.

  The first switch 41A is an n-channel enhancement type field effect transistor. The drain of the first switch 41A is electrically connected to the first input terminal 43A. The source of the first switch 41A is electrically connected to the first output terminal 44A. That is, when the first switch 41A is on, a current flows through the first switch 41A, so the first LED light source 40A is turned off. Since the current flows through the first LED light source 40A when the first switch 41A is off, the first LED light source 40A is turned on.

  The first switch control unit 42A includes a first power supply circuit unit 420A, a first switch element 421A, a first capacitor 422A, a first diode 423A, a first transistor 424A, resistors 425A, 426A, and the like. The first power supply circuit unit 420A includes a backflow prevention diode D1, resistors R1 to R3, and a capacitor C1, and stabilizes the direct current voltage input from the auxiliary power supply 6 to the first power supply terminal 47A to provide a first switch. It is configured to output to the gate of 41A. The first switch element 421A is an NPN-type bipolar transistor. The collector of the first switch element 421A is electrically connected to the gate of the first switch 41A. The emitter of the first switch element 421A is electrically connected to the first output terminal 44A. The base of the first switch element 421A is electrically connected to one end of the two resistors 425A and 426A. One end of the first capacitor 422A is electrically connected to the first output terminal 44A. The other end of the first capacitor 422A is electrically connected to the cathode of the first diode 423A. The anode of the first diode 423A is electrically connected to the first auxiliary terminal 45A. The first transistor 424A is a PNP-type bipolar transistor. The emitter of the first transistor 424A is electrically connected to the cathode of the first diode 423A. The collector of the first transistor 424A is electrically connected to the base of the first switch element 421A via the resistor 425A. The base of the first transistor 424A is electrically connected to the anode of the first diode 423A and the first auxiliary terminal 45A.

  The second light source unit 4B includes a second LED light source 40B, a second switch 41B, and a second switch control unit 42B. The second light source unit 4B includes a second input terminal 43B, a second output terminal 44B, a second auxiliary terminal 45B, a second feed terminal 46B, and a second power supply terminal 47B. The second input terminal 43B is electrically connected to the first output terminal 44A of the first light source unit 4A. The second auxiliary terminal 45B is electrically connected to the first feed terminal 46A of the first light source unit 4A. The second power supply terminal 47 </ b> B is electrically connected to the positive electrode of the auxiliary power supply 6.

  The second LED light source 40B is composed of a series circuit of two LEDs. The positive electrode (the anode of one LED) of the second LED light source 40B is electrically connected to the second input terminal 43B and the second feed terminal 46B. The negative electrode of the second LED light source 40B (the cathode of the other LED) is electrically connected to the second output terminal 44B.

  The second switch 41B is an n-channel enhancement type field effect transistor. The drain of the second switch 41B is electrically connected to the second input terminal 43B. The source of the second switch 41B is electrically connected to the second output terminal 44B. That is, when the second switch 41B is on, a current flows through the second switch 41B, so the second LED light source 40B is turned off. Since the current flows through the second LED light source 40B when the second switch 41B is off, the second LED light source 40B is turned on.

  The second switch control unit 42B includes a second power supply circuit unit 420B, a second switch element 421B, a second capacitor 422B, a second diode 423B, a second transistor 424B, resistors 425B and 426B, and the like. The second power supply circuit unit 420B includes a backflow prevention diode D2, resistors R4 to R6, and a capacitor C2, and stabilizes the direct current voltage input from the auxiliary power supply 6 to the second power supply terminal 47B to provide a second switch. It is configured to output to the gate of 41B. The second switch element 421B is an NPN type bipolar transistor. The collector of the second switch element 421B is electrically connected to the gate of the second switch 41B. The emitter of the second switch element 421B is electrically connected to the second output terminal 44B. The base of the second switch element 421B is electrically connected to one end of the two resistors 425B and 426B. One end of the second capacitor 422B is electrically connected to the second output terminal 44B. The other end of the second capacitor 422B is electrically connected to the cathode of the second diode 423B. The anode of the second diode 423B is electrically connected to the second auxiliary terminal 45B. The second transistor 424B is a PNP-type bipolar transistor. The emitter of the second transistor 424B is electrically connected to the cathode of the second diode 423B. The collector of the second transistor 424B is electrically connected to the base of the second switch element 421B via the resistor 425B. The base of the second transistor 424B is electrically connected to the anode of the second diode 423B and the second auxiliary terminal 45B.

  The third light source unit 4C includes a third LED light source 40C, a third switch 41C, and a third switch control unit 42C. The third light source unit 4C includes a third input terminal 43C, a third output terminal 44C, a third auxiliary terminal 45C, a third feed terminal 46C, and a third power supply terminal 47C. The third input terminal 43C is electrically connected to the second output terminal 44B of the second light source unit 4B. The third auxiliary terminal 45C is electrically connected to the second feed terminal 46B of the second light source unit 4B. The third power supply terminal 47C is electrically connected to the positive electrode of the auxiliary power supply 6.

  The third LED light source 40C is configured by a series circuit of two LEDs. The positive electrode (the anode of one LED) of the third LED light source 40C is electrically connected to the third input terminal 43C and the third feed terminal 46C. The negative electrode of the third LED light source 40C (the cathode of the other LED) is electrically connected to the third output terminal 44C.

  The third switch 41C is an n-channel enhancement type field effect transistor. The drain of the third switch 41C is electrically connected to the third input terminal 43C. The source of the third switch 41C is electrically connected to the third output terminal 44C. That is, when the third switch 41C is on, a current flows through the third switch 41C, and thus the third LED light source 40C is turned off. And since the electric current flows into the 3rd LED light source 40C when the 3rd switch 41C is OFF, the 3rd LED light source 40C lights up.

  The third switch control unit 42C includes a third power supply circuit unit 420C, a third switch element 421C, a third capacitor 422C, a third diode 423C, a third transistor 424C, resistors 425C and 426C, and the like. The third power supply circuit unit 420C includes a backflow prevention diode D3, resistors R7 to R9, and a capacitor C3, and stabilizes the DC voltage input from the auxiliary power supply 6 to the third power supply terminal 47C to provide a third switch. It is configured to output to the gate of 41C. The third switch element 421C is an NPN-type bipolar transistor. The collector of the third switch element 421C is electrically connected to the gate of the third switch 41C. The emitter of the third switch element 421C is electrically connected to the third output terminal 44C. The base of the third switch element 421C is electrically connected to one end of the two resistors 425C and 426C. One end of the third capacitor 422C is electrically connected to the third output terminal 44C. The other end of the third capacitor 422C is electrically connected to the cathode of the third diode 423C. The anode of the third diode 423C is electrically connected to the third auxiliary terminal 45C. The third transistor 424C is a PNP type bipolar transistor. The emitter of the third transistor 424C is electrically connected to the cathode of the third diode 423C. The collector of the third transistor 424C is electrically connected to the base of the third switch element 421C via the resistor 425C. The base of the third transistor 424C is electrically connected to the anode of the third diode 423C and the third auxiliary terminal 45C.

  The fourth light source unit 4D includes a fourth LED light source 40D, a fourth switch 41D, and a fourth switch control unit 42D. The fourth light source unit 4D includes a fourth input terminal 43D, a fourth output terminal 44D, a fourth auxiliary terminal 45D, a fourth feed terminal 46D, and a fourth power supply terminal 47D. The fourth input terminal 43D is electrically connected to the third output terminal 44C of the third light source unit 4C. The fourth output terminal 44 </ b> D is electrically connected to the second output terminal 21 of the power supply unit 2 and the negative electrode of the auxiliary power supply 6. The fourth auxiliary terminal 45D is electrically connected to the third feed terminal 46C of the third light source unit 4C. The fourth power supply terminal 47D is electrically connected to the positive electrode of the auxiliary power supply 6.

  The fourth LED light source 40D is composed of a series circuit of two LEDs. The positive electrode (the anode of one LED) of the fourth LED light source 40D is electrically connected to the fourth input terminal 43D and the fourth feed terminal 46D. The negative electrode of the fourth LED light source 40D (the cathode of the other LED) is electrically connected to the fourth output terminal 44D.

  The fourth switch 41D is an n-channel enhancement type field effect transistor. The drain of the fourth switch 41D is electrically connected to the fourth input terminal 43D. The source of the fourth switch 41D is electrically connected to the fourth output terminal 44D. That is, when the fourth switch 41D is on, the fourth LED light source 40D is turned off because a current flows through the fourth switch 41D. And since the electric current flows into 4th LED light source 40D when 4th switch 41D is OFF, 4th LED light source 40D lights.

  The fourth switch control unit 42D includes a fourth power supply circuit unit 420D, a fourth switch element 421D, a fourth capacitor 422D, a fourth diode 423D, a fourth transistor 424D, resistors 425D and 426D, and the like. The fourth power supply circuit unit 420D includes a backflow prevention diode D4, resistors R10 to R12, and a capacitor C4. The fourth power supply circuit unit 420D stabilizes the DC voltage input from the auxiliary power supply 6 to the fourth power supply terminal 47D. It is configured to output to the gate of 41D. The fourth switch element 421D is an NPN-type bipolar transistor. The collector of the fourth switch element 421D is electrically connected to the gate of the fourth switch 41D. The emitter of the fourth switch element 421D is electrically connected to the fourth output terminal 44D. The base of the fourth switch element 421D is electrically connected to one end of the two resistors 425D and 426D. One end of the fourth capacitor 422D is electrically connected to the fourth output terminal 44D. The other end of the fourth capacitor 422D is electrically connected to the cathode of the fourth diode 423D. The anode of the fourth diode 423D is electrically connected to the fourth auxiliary terminal 45D. The fourth transistor 424D is a PNP-type bipolar transistor. The emitter of the fourth transistor 424D is electrically connected to the cathode of the fourth diode 423D. The collector of the fourth transistor 424D is electrically connected to the base of the fourth switch element 421D via the resistor 425D. The base of the fourth transistor 424D is electrically connected to the anode of the fourth diode 423D and the fourth auxiliary terminal 45D.

  Next, the operation of the lighting device 1Z will be described with reference to the circuit diagram of FIG. 4 and the time chart of FIG.

  For example, the power supply unit 2 turns off the output switch 22 until a trigger signal is input from the outside, and turns on the output switch 22 to supply the output current Io when the trigger signal is input. Before the trigger signal is input (before time t = t1), the output switch 22 is turned off and the output current Io is not supplied from the power supply unit 2, so the auxiliary LED light source 50 and the first LED light source 40A to the fourth LED light source 40D. Are all off. However, since the DC voltage is supplied from the auxiliary power source 6 to the power terminals 47A to 47D of the first light source unit 4A to the fourth light source unit 4D, the first switch 41A to the fourth switch 41D are all turned on. In the following description, the above-described state is referred to as an initial state of the lighting device 1Z.

  When the trigger signal is input, the power supply unit 2 turns on the output switch 22 to switch the current value of the output current Io from the second current value I2 (I2 = 0) to the first current value I1 (I1> 0) ( Time t = t1). When the output current Io is supplied from the power supply unit 2, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on. On the other hand, in the initial state, since the first switch 41A to the fourth switch 41D are all turned on, all the LED light sources 40A to 40D of the first light source unit 4A to the fourth light source unit 4D are turned off. Here, the forward voltage generated at both ends of the lit auxiliary LED light source 50 is connected in series between the diode 423A and the capacitor 422A from the auxiliary terminal 53 of the auxiliary light source unit 5 through the first auxiliary terminal 45A of the first light source unit 4A. Applied to the circuit. Therefore, a part of the output current Io flows from the auxiliary terminal 53 to the capacitor 422A via the first auxiliary terminal 45A and the diode 423A, and charges the capacitor 422A to a voltage substantially equal to the forward voltage of the auxiliary LED light source 50. However, since the first LED light source 40A to the third LED light source 40C are turned off, the capacitors 422B to 422D of the second light source unit 4B to the fourth light source unit 4D are not charged.

  The power supply unit 2 turns on / off the output switch 22 at a constant first period (first period Ts + second period Td). Therefore, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t1), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t2). When the current value of the output current Io reaches the second current value I2, the auxiliary LED light source 50 is turned off. At this time, when the first switch 41A of the first light source unit 4A is on, the charge of the capacitor 422A is in the path from the emitter to the base of the transistor 424A, the resistor 54 of the auxiliary light source unit 5, and the first switch 41A. Discharged. On the other hand, when the first switch 41A of the first light source unit 4A is in the OFF state, the charge of the capacitor 422A is charged from the emitter to the base of the transistor 424A, the resistor 54 of the auxiliary light source unit 5, the resistor 426A of the first light source unit 4A, The first switch element 421A is discharged from the base to the emitter / capacitor 422A path. As a result, the transistor 424A is turned on, the charge of the capacitor 422A is discharged to the base of the first switch element 421A via the resistor 425A, and the first switch element 421A is turned on. When the first switch element 421A is turned on, the electric charge of the capacitor C1 is discharged, and the gate-source voltage of the first switch 41A becomes almost zero, so the first switch 41A is turned off. In the second light source unit 4B to the fourth light source unit 4D, since the capacitors 422B to 422D are not charged, the second switch 41B to the fourth switch 41D are not turned off.

  When the second period Td elapses from the time when the output switch 22 is turned off (time t = t2), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t3). When the output current Io is supplied from the power supply unit 2, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on. Further, since the first switch 41A of the first light source unit 4A is off, the output current Io flows through the first LED light source 40A, and the first LED light source 40A is turned on. The base current continues to be supplied to the first switch element 421A via the resistor 426A due to the forward voltage generated with the lighting of the first LED light source 40A. Therefore, the ON state of the first switch element 421A is continued, the first switch 41A is turned OFF, and the first LED light source 40A is kept in the lighting state. On the other hand, since the second switch 41B to the fourth switch 41D of the second light source unit 4B to the fourth light source unit 4D are turned on, the second LED light source 40B to the fourth LED light source 40D remain off without being turned on. Here, the forward voltage generated at both ends of the first LED light source 40A being lit is connected to the diode 423B and the capacitor from the first feed terminal 46A of the first light source unit 4A through the second auxiliary terminal 45B of the second light source unit 4B. Applied to the series circuit of 422B. Therefore, a part of the output current Io flows from the first sending terminal 46A to the capacitor 422B via the second auxiliary terminal 45B and the diode 423B, and charges the capacitor 422B to a voltage substantially equal to the forward voltage of the first LED light source 40A. . The capacitor 422A of the first light source unit 4A is charged by a forward voltage generated at both ends of the auxiliary LED light source 50 that is lit. However, since the second LED light source 40B and the third LED light source 40C are turned off, the capacitors 422C and 422D of the third light source unit 4C and the fourth light source unit 4D are not charged.

  Then, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t3), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t4). When the current value of the output current Io reaches the second current value I2, the auxiliary LED light source 50 and the first LED light source 40A are turned off. At this time, when the second switch 41B of the second light source unit 4B is in the ON state, the charge of the capacitor 422B is charged from the emitter of the transistor 424B to the base, the resistor 426A of the first light source unit 4A, the second switch 41B, the capacitor It is discharged through the path 422B. On the other hand, when the second switch 41B of the second light source unit 4B is in the OFF state, the charge of the capacitor 422B is charged from the emitter of the transistor 424B to the base, the resistor 426A of the first light source unit 4A, and the base of the first switch element 421A. To the emitter, the resistor 426B of the second light source unit 4B, and the base of the second switch element 421B to the emitter and capacitor 422B. As a result, the transistor 424B is turned on, the charge of the capacitor 422B is discharged to the base of the second switch element 421B through the resistor 425B, and the second switch element 421B is turned on. When the second switch element 421B is turned on, the electric charge of the capacitor C2 is discharged, and the gate-source voltage of the second switch 41B becomes almost zero, so that the second switch 41B is turned off. Also in the first light source unit 4A, the first switch 41A is continuously turned off because the first switch element 421A is turned on by the discharge of the capacitor 422A. In the third light source unit 4C and the fourth light source unit 4D, the capacitors 422C and 422D are not charged, so the third switch 41C and the fourth switch 41D are not turned off.

  When the second period Td elapses from the time point when the output switch 22 is turned off (time t = t4), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t5). When the output current Io is supplied from the power supply unit 2, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on. Also, since the first switch 41A of the first light source unit 4A and the second switch 41B of the second light source unit 4B are off, the output current Io flows through the first LED light source 40A and the second LED light source 40B, and the first LED light source 40A and the second LED light source 40B are turned on. Note that the base current continues to be supplied to the second switch element 421B via the resistor 426B due to the forward voltage generated when the second LED light source 40B is turned on. Therefore, the ON state of the second switch element 421B is continued, the second switch 41B is turned OFF, and the second LED light source 40B is maintained in the lighting state. On the other hand, since the third switch 31C of the third light source unit 4C and the fourth switch 41D of the fourth light source unit 4D are turned on, the third LED light source 40C and the fourth LED light source 40D are not turned on but remain turned off. Here, the forward voltage generated at both ends of the second LED light source 40B that is lit is connected to the diode 423C and the capacitor from the first feed terminal 46B of the second light source unit 4B via the third auxiliary terminal 45C of the third light source unit 4C. Applied to a series circuit of 422C. Therefore, a part of the output current Io flows from the second feed terminal 46B to the capacitor 422C via the third auxiliary terminal 45C and the diode 423C, and charges the capacitor 422C to a voltage substantially equal to the forward voltage of the second LED light source 40B. . The capacitor 422A of the first light source unit 4A is charged by a forward voltage generated at both ends of the auxiliary LED light source 50 that is lit. Further, the capacitor 422B of the second light source unit 4B is charged by a forward voltage generated at both ends of the first LED light source 40A that is lit. However, since the third LED light source 40C is turned off, the capacitor 422D of the fourth light source unit 4D is not charged.

  Then, the power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t5), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t6). When the current value of the output current Io reaches the second current value I2, the auxiliary LED light source 50, the first LED light source 40A, and the second LED light source 40B are turned off. At this time, when the third switch 41C of the third light source unit 4C is in an ON state, the charge of the capacitor 422C is charged from the emitter of the transistor 424C to the base, the resistor 426B of the second light source unit 4B, the third switch 41C, the capacitor It is discharged through the path 422C. On the other hand, when the third switch 41C of the third light source unit 4C is in an OFF state, the charge of the capacitor 422C is charged from the emitter of the transistor 424C, the resistor 426B of the second light source unit 4B, and the base of the second switch element 421B. To the emitter, the resistor 426C of the third light source unit 4C, and the base of the second switch element 421C to the emitter and capacitor 422C. As a result, the transistor 424C is turned on, the charge of the capacitor 422C is discharged to the base of the third switch element 421C through the resistor 425C, and the third switch element 421C is turned on. When the third switch element 421C is turned on, the electric charge of the capacitor C3 is discharged, and the gate-source voltage of the third switch 41C becomes almost zero, so that the third switch 41C is turned off. Also in the first light source unit 4A and the second light source unit 4B, the first switch element 421A and the second switch 421B are turned on by the discharge of the capacitors 422A and 422B. Therefore, the first switch 41A and the second switch 41B are continuously turned off. In the fourth light source unit 4D, since the capacitor 422D is not charged, the fourth switch 41D is not turned off.

  When the second period Td elapses from the time when the output switch 22 is turned off (time t = t6), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t7). When the output current Io is supplied from the power supply unit 2, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on. Further, the first switch 41A of the first light source unit 4A, the second switch 41B of the second light source unit 4B, and the third switch 41C of the third light source unit 4C are turned off. Therefore, an output current Io flows through the first LED light source 40A, the second LED light source 40B, and the third LED light source 40C, and the first LED light source 40A, the second LED light source 40B, and the third LED light source 40C are turned on. Note that the base current continues to be supplied to the third switch element 421C via the resistor 426C due to the forward voltage generated with the lighting of the third LED light source 40C. Therefore, the ON state of the third switch element 421C is continued, the third switch 41C is turned OFF, and the third LED light source 40C maintains the lighting state. On the other hand, since the fourth switch 41D of the fourth light source unit 4D is on, the fourth LED light source 40D is not turned on but remains turned off. Here, the forward voltage generated at both ends of the lit third LED light source 40C is connected to the diode 423D and the capacitor from the first feed terminal 46C of the third light source unit 4C through the fourth auxiliary terminal 45D of the fourth light source unit 4D. Applied to a 422D series circuit. Therefore, a part of the output current Io flows from the first sending terminal 46C to the capacitor 422D through the fourth auxiliary terminal 45D and the diode 423D, and charges the capacitor 422D to a voltage substantially equal to the forward voltage of the third LED light source 40C. . The capacitor 422A of the first light source unit 4A is charged by a forward voltage generated at both ends of the auxiliary LED light source 50 that is lit. Further, the capacitor 422B of the second light source unit 4B is charged by a forward voltage generated at both ends of the first LED light source 40A that is lit. Furthermore, the capacitor 422C of the third light source unit 4C is charged by a forward voltage generated at both ends of the second LED light source 40B that is lit.

  The power supply unit 2 turns off the output switch 22 when the first period Ts elapses from the time when the output switch 22 is turned on (time t = t7), and changes the current value of the output current Io from the first current value I1 to the second value. Switching to the current value I2 (time t = t8). When the current value of the output current Io reaches the second current value I2, the auxiliary LED light source 50, the first LED light source 40A, the second LED light source 40B, and the third LED light source 40C are turned off. At this time, when the fourth switch 41D of the fourth light source unit 4D is in the ON state, the charge of the capacitor 422D is charged from the emitter to the base of the transistor 424D, the resistor 426C of the third light source unit 4C, the fourth switch 41D, the capacitor It is discharged through the path 422D. On the other hand, when the fourth switch 41D of the fourth light source unit 4D is in the off state, the charge of the capacitor 422D is charged from the emitter of the transistor 424D, the resistor 426C of the third light source unit 4C, and the base of the third switch element 421C. To the emitter, the resistor 426D of the fourth light source unit 4D, and the base of the third switch element 421D to the emitter and the capacitor 422D. As a result, the transistor 424D is turned on, the charge of the capacitor 422D is discharged to the base of the fourth switch element 421D via the resistor 425D, and the fourth switch element 421D is turned on. When the fourth switch element 421D is turned on, the charge of the capacitor C4 is discharged, and the gate-source voltage of the fourth switch 41D becomes almost zero, so the fourth switch 41D is turned off. Also in the first light source unit 4A to the third light source unit 4C, the first switch element 421A to the third switch 421C are turned on by the discharge of the capacitors 422A to 422C. Therefore, the first switch 41A to the third switch 41C are continuously turned off.

  When the second period Td elapses from the time point when the output switch 22 is turned off (time t = t8), the power supply unit 2 turns on the output switch 22 and changes the current value of the output current Io from the second current value I2 to the first current value. Switch to I1 (time t = t9). When the output current Io is supplied from the power supply unit 2, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on. In addition, the first switch 41A to the fourth switch 41D of the first light source unit 4A to the fourth light source unit 4D are off. Therefore, the output current Io flows through the first LED light source 40A to the fourth LED light source 40D, and the first LED light source 40A to the fourth LED light source 40D are turned on. Note that the base current continues to be supplied to the fourth switch element 421D via the resistor 426D due to the forward voltage generated when the fourth LED light source 40D is turned on. Therefore, the on state of the fourth switch element 421D is continued, the fourth switch 41D is turned off, and the fourth LED light source 40D maintains the lighting state. Further, after time t = t9, even if the power supply unit 2 turns on / off the output switch 22, the auxiliary LED light source 50 and the first LED light source 40A to the fourth LED light source 40D all blink.

  Furthermore, the power supply unit 2 is configured to be longer than the first period from the time when the trigger signal is input (time t = t1) when the output switch 22 is turned off after the first period Ts has elapsed (time t = t10). If two cycles To have elapsed, the second period Td is extended. At this time, the power supply unit 2 extends the second period Td to a time longer than the threshold value Tv. However, the threshold Tv is preferably longer than the time during which the first switch element 421A to the fourth switch element 421D are maintained in the ON state by the discharge of the capacitors 422A to 422D. In addition, it is preferable that the second period To is, for example, a period that is several times to several tens of times the first period, or a period that is several tens of times.

  The power supply unit 2 turns on and outputs the output switch 22 at the time (time t = t11) when the extended second period (third time period Tr) has elapsed from the time when the output switch 22 is turned off (time t = t10). The current value of the current Io is switched from the second current value I2 to the first current value I1. In the third period Tr, the discharge of the capacitors 422A to 422D is almost completed, and the first switch element 421A to the fourth switch element 421D are all turned off. As a result, the first switch 41A to the fourth switch 41D are all turned on by the DC voltage supplied from the auxiliary power supply 6. That is, the lighting device 1Z returns to the initial state. When the third period Tr elapses, the power supply unit 2 turns on the output switch 22 to switch the current value of the output current Io from the second current value I2 to the first current value I1 (time t = t11). Since the output current Io is supplied from the power supply unit 2 because the power source unit 2 is returned to the initial state, the auxiliary LED light source 50 of the auxiliary light source unit 5 is turned on and all the LED light sources of the first light source unit 4A to the fourth light source unit 4D are turned on. 40A-40D turns off. Thereafter, the power supply unit 2 turns the output switch 22 on and off at the timing described above. That is, after the auxiliary LED light source 50 is turned on, the state in which the number of LED light sources that are turned on in the first LED light source 40A to the fourth LED light source 40D is incremented by one is periodically repeated.

  If the auxiliary power supply 6 is stopped, the first switch 41A to the fourth switch 41D are turned off. Therefore, in a state where the auxiliary power supply 6 is stopped, all the light sources 50 and 40A to 40D are flashed all at once according to the on / off of the output switch 22 of the power supply unit 2.

  As described above, the lighting device 1Z is composed of only two electric wires for power feeding, as in the lighting device 1X of the first embodiment and the lighting device 1Y of the second embodiment, and the power source unit 2 and the plurality of light source units 4A to 4D. It is connected and does not require a control signal line or the like for each of the plurality of light source units 4A to 4D. As a result, the lighting device 1Z can save wiring.

(Embodiment 4)
The vehicle 8 according to the present embodiment is preferably, for example, a sedan type ordinary passenger car (see FIG. 6). The lighting devices 1X, 1Y, and 1Z of the first to third embodiments are preferably mounted on the vehicle body 80 of the vehicle 8 as a direction indicator, for example. The vehicle 8 equipped with any one of the lighting devices 1X, 1Y, 1Z can blink the direction indicator by chain lighting (sequential lighting).

  As described above, the vehicle 8 according to the present embodiment includes the lighting device 1X (or the lighting device 1Y or the lighting device 1Z) and the vehicle body 80 on which the lighting device 1X (or the lighting device 1Y or the lighting device 1Z) is mounted. .

  If the vehicle 8 is configured as described above, since the lighting device 1X (or the lighting device 1Y or the lighting device 1Z) capable of reducing wiring is mounted, the wire harness mounted on the vehicle body 80 can be saved. Wiring can be achieved.

1X, 1Y, 1Z lighting device 2 power supply unit 3A-3J light source unit 4A-4D light source unit 8 vehicle 20 first output terminal 21 second output terminal 30A-30J LED (solid state light emitting element)
31A to 31J Switch 32A to 32J Switch control unit 40A to 40D LED light source (solid state light emitting device)
80 Body Io Output current (DC power)
I1 First current value (first power value)
I2 Second current value (second power value)
Ts First period Td Second period Tw Threshold (first threshold, second threshold)

Claims (8)

A power supply unit and a plurality of light source units;
The power supply unit outputs DC power from a first output terminal and a second output terminal, and the DC power is periodically changed into a first power value and a second power value smaller than the first power value. Configured to switch to
The plurality of light source units are electrically connected between the first output terminal and the second output terminal,
Each of the plurality of light source units includes one or more solid-state light emitting elements, a switch for turning on / off the supply of the DC power to the one or more solid-state light emitting elements, and switch control for controlling on / off of the switches Department and
The plurality of switch control units included in the plurality of light source units on a one-to-one basis, respectively, in the first period in which the direct-current power of the first power value is supplied, The state of one or more of the solid state light emitting elements including the solid state light emitting element among the solid state light emitting elements is detected, and the first period immediately before the second period in which the DC power of the second power value is supplied. A lighting device configured to maintain and reverse the state of the switch that the self turns on and off according to a detection result of the state of the one or more solid state light emitting elements in a period. The power supply is configured to extend the second period;
Each of the plurality of switch control units is configured to set a switch state in which the switch is turned on and off as a predetermined initial state at the time when the extended second period ends, regardless of the detection result. The lighting device according to claim 1.   The said power supply part is comprised so that the said 2nd period may be extended with a period longer than the period which switches and outputs the said direct-current power to the said 1st power value and the said 2nd power value. Lighting device. Each of the plurality of switch control units compares the time length of the extended second period with a predetermined threshold value, and when the time length of the extended second period exceeds the threshold value, It is configured to set the state of the switch that self turns on and off as a predetermined initial state,
The threshold value includes at least a first threshold value and a second threshold value different from the first threshold value,
The plurality of switch control units are each configured to compare a time length of the extended second period with either the first threshold value or the second threshold value. Or the lighting device of 3.   The lighting device according to any one of claims 1 to 4, wherein the plurality of light source units are electrically connected in series between the first output terminal and the second output terminal.   The lighting device according to claim 1, wherein the plurality of light source units are electrically connected in parallel between the first output terminal and the second output terminal.   The lighting device according to claim 1, wherein the power supply unit is configured to set the second power value to zero.   A vehicle comprising the lighting device according to claim 1 and a vehicle body on which the lighting device is mounted.

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