Lighting device and vehicle lamp

Abstract

The present invention provides a lighting device capable of suppressing variations in timing for lighting a plurality of light sources. The lighting device is provided with: a first lighting circuit that lights a first light source if the state of a first signal satisfies a first condition, and changes the brightness of the first light source in accordance with the state of the first signal; a second lighting circuit that lights a second light source if the state of a second signal satisfies a second condition different from the first condition, and changes the brightness of the second light source in accordance with the state of the second signal; and a first output circuit that outputs the first signal, the state of which changes from a first initial state satisfying the first condition, to the first lighting circuit on the basis of an instruction signal so that the first light source is turned on and gradually turned on, and outputs the second signal, the state of which changes from a second initial state satisfying the second condition, to the second lighting circuit so that the second light source is turned on and gradually turned on.

Description

Technical Field

[0001] The invention relates to a lighting device and a vehicle lamp. Background Art

[0002] A general vehicle is provided with a headlamp and a lighting circuit for lighting the headlamp, and the headlamp is provided in front of the vehicle (for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-55425

[0004] However, for example, in front of a vehicle, in addition to the headlight, an auxiliary lamp may be provided. In this case, the auxiliary lamp is lit by a circuit different from the lighting circuit of the headlight.

[0005] Furthermore, generally, the operating conditions of the lighting circuit for the headlight and the lighting circuit for the auxiliary light are different. Therefore, even if the control circuit controls the operation of the plurality of lighting circuits so that the headlight and the auxiliary light are lit simultaneously and gradually become brighter, sometimes the timing of lighting the headlight and the auxiliary light may differ greatly. Summary of the invention

[0006] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a lighting device capable of suppressing variations in timings for lighting a plurality of light sources.

[0007] One embodiment of the present invention relates to a lighting device, comprising: a first lighting circuit, which lights a first light source if a state of a first signal satisfies a first condition, and changes the brightness of the first light source according to the state of the first signal; a second lighting circuit, which lights a second light source if a state of a second signal satisfies a second condition different from the first condition, and changes the brightness of the second light source according to the state of the second signal; and a first output circuit, which outputs the first signal whose state is changed from a first initial state that satisfies the first condition to the first lighting circuit based on an indication signal, so that the first light source is lit and gradually becomes brighter, and outputs the second signal whose state is changed from a second initial state that satisfies the second condition to the second lighting circuit, so that the second light source is lit and gradually becomes brighter.

[0008] One embodiment of the present invention relates to a lighting device for lighting a first light source and a second light source installed in a vehicle, comprising: a first lighting circuit, which lights the first light source if a state of a first signal satisfies a first condition, and changes the brightness of the first light source according to the state of the first signal; a second lighting circuit, which lights the second light source if a state of the second signal satisfies a second condition different from the first condition, and changes the brightness of the second light source according to the state of the second signal; and a first output circuit, which outputs the first signal whose state is changed from a first initial state that satisfies the first condition to the first lighting circuit if a door of the vehicle is unlocked, so that the first light source is lit and gradually becomes brighter, and outputs the second signal whose state is changed from a second initial state that satisfies the second condition to the second lighting circuit, so that the second light source is lit and gradually becomes brighter.

[0009] According to the present invention, it is possible to provide a lighting device capable of suppressing variations in timings for lighting a plurality of light sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 1 is a diagram schematically showing the front of a vehicle C. Figure 2 1 is a diagram schematically showing a vehicle lamp 100 . Figure 3 2 is a diagram showing an example of the configuration of the lighting device 210 . Figure 4 This is a diagram showing an example of a part of the microcomputer 230 and IF circuits 231 and 232 . Figure 5 It is a diagram for explaining the signal S1. Figure 6 This is a flowchart showing an example of processing executed by the control device 110 . Figure 7 This is a diagram for explaining an example of changes in the signals S1 to S3. DETAILED DESCRIPTION

[0011] At least the following matters are clear from the description of this specification and the drawings.

[0012] This embodiment <<About Vehicle C>> Figure 1 is a diagram showing the outline of the front of the vehicle C. Figure 1In the diagram, the vertical direction of the paper is defined as the up-down direction, and the horizontal direction of the paper is defined as the left-right direction. In addition, the upper side of the paper is defined as "up" in the up-down direction, and the right side of the paper is defined as "left" in the left-right direction. Furthermore, the direction in front of the paper is defined as "front" in the front-back direction. Here, the headlights L1, L2 and the auxiliary light L3 are provided in front of the vehicle C.

[0013] The headlamp L1 is mounted on the left front side of the vehicle C and includes a low-beam lamp 10 , a high-beam lamp 11 , and a lamp 12 for indicating the width of the vehicle C (ie, a width indicator lamp).

[0014] The headlamp L2 is a lamp installed on the right front of the vehicle C, and includes a low beam lamp 20, a high beam lamp 21, and a lamp 22 (i.e., a width lamp) for indicating the width of the vehicle C. The lamps 20 and 21 are the same as the lamps 10 and 11, and the lamp 22 is the same as the lamp 12.

[0015] The auxiliary lamp L3 is a lamp for indicating the width of the vehicle C together with the lamps 12 and 22 and is mounted in the front center of the vehicle C. The auxiliary lamp L3 is lit when a door (not shown) of the vehicle C is unlocked and gradually becomes brighter, as will be described in detail later.

[0016] <<About the vehicle lamp 100>> Figure 2 1 is a diagram showing an example of the structure of a vehicle lamp 100 provided in a vehicle C. The vehicle lamp 100 includes the headlamps L1 and L2 , the auxiliary lamp L3 , and the control device 110 described above.

[0017] The control device 110 is a device that controls lighting of the headlamps L1 , L2 and the auxiliary lamp L3 , and is configured to include an ECU (Electronic Control Unit) 200 and a lighting device 210 .

[0018] ECU200 outputs the indication signal SI corresponding to the operation result of the user to the lighting device 210. Here, "operation" refers to an operation for lighting at least one of the headlights L1, L2 and the auxiliary lamp L3. "Operation" is not limited to the user operating a part of the vehicle C (for example, an indicator for turning on or off the headlights), and also includes, for example, operating the keyless device of the vehicle C and bringing the smart key close to the vehicle C.

[0019] In addition, a "keyless device" refers to, for example, a device that can remotely unlock and lock the doors of vehicle C. In addition, a "smart key" refers to, for example, a device that instructs vehicle C to unlock the doors of vehicle C when the device is within a predetermined range of vehicle C. In addition, hereinafter, keyless devices and smart keys and other devices may be simply referred to as "keyless devices, etc.".

[0020] The lighting device 210 is a device that turns on or off the headlamps L1 , L2 and the auxiliary lamp L3 based on the instruction signal SI, and is configured to include light emitting modules 220 , 221 and a lighting circuit 222 .

[0021] The light emitting module 220 turns on or off the headlight L1 based on the instruction signal SI, and the light emitting module 221 turns on or off the headlight L2 based on the instruction signal SI. For example, if the ECU 200 outputs the instruction signal SI to turn on the low beam lamps 10 and 20 of the headlights L1 and L2, the light emitting module 220 turns on the lamp 10, and the light emitting module 221 turns on the lamp 20.

[0022] Furthermore, when the ECU 200 outputs the instruction signal SI for turning off the lamps 10 and 20 while the lamps 10 and 20 are on, the light emitting module 220 turns off the lamp 10 and the light emitting module 221 turns off the lamp 20 .

[0023] Furthermore, the light emitting module 220 outputs a signal S2 (described later) for lighting the auxiliary lamp L3 to the lighting circuit 222 based on the instruction signal S1 for lighting the auxiliary lamp L3. Details will be described later.

[0024] The lighting circuit 222 lights the auxiliary lamp L3 based on the signal S2. In addition, "lighting" includes not only the case where the brightness of the lamp is directly set to a predetermined brightness, but also includes, for example, the case where the brightness of the lamp is gradually changed. In addition, gradually brightening the brightness of the lamp (that is, gradually increasing the light amount of the lamp) is called "gradual lighting".

[0025] However, the lighting device 210 of the present embodiment gradually lights up the width indicator lamps 12 and 22 and the auxiliary lamp L3 among the headlamps L1 and L2 when the keyless device or the like is operated and the doors of the vehicle C are unlocked. Therefore, the following description will focus on the structure of gradually lighting up the lamps 12 and 22 and the auxiliary lamp L3 in the lighting device 210.

[0026] <<An example of a configuration of a lighting device 210 that realizes gradual lighting>> Figure 3 The figure shows an example of the structure of the light emitting modules 220 and 221 that can gradually light up the lamps 12 and 22 and the auxiliary lamp L3. In addition, for the sake of convenience, the structure of lighting up the lamps 10 and 11 of the headlight L1 and the lamps 20 and 21 of the headlight L2 is omitted in the light emitting modules 220 and 221.

[0027] In addition, the lamps 12, 22 and the auxiliary lamp L3 are each configured to include one or more light emitting elements. In addition, the lamps 12, 22 and the auxiliary lamp L3 are hereinafter appropriately referred to as "three lamps".

[0028] <<Light emitting module 220>> The light-emitting module 220 turns on the lamp 12 based on the indication signal SI, and outputs a signal S2 (described later) for turning on the auxiliary lamp L3 to the lighting circuit 222. The light-emitting module 220 is configured to include a microcomputer 230, IF (Interface) circuits 231 and 232, and a lighting circuit 233.

[0029] <Microcomputer 230> Figure 4 FIG. is an example of the structure of a part of the microcomputer 230 and the structures of the IF circuits 231 and 232. The microcomputer 230 generates signals Sa and Sb as PWM (Pulse width modulation) signals based on the indication signal SI for gradually lighting up three lamps.

[0030] The microcomputer 230 is configured to include a control unit 300 and transistors 310 and 311. The control unit 300 is a functional block implemented in the microcomputer 230 by the arithmetic circuit (not shown) of the microcomputer 230 executing a program stored in a memory (not shown). The control unit 300 controls the on and off of the transistors 310 and 311 based on the indication signal SI.

[0031] The transistor 310 is a MOS transistor constituting a so-called open-drain circuit, and the drain terminal of the transistor 310 is connected to the terminal 320 of the microcomputer 230. The transistor 311 is also a MOS transistor configured as an open-drain circuit in the same manner as the transistor 310. The drain terminal of the transistor 311 is connected to the terminal 321 of the microcomputer 230.

[0032] <IF circuit 231> The IF circuit 231 is a circuit that outputs a signal S1 having the same logic level as the logic level of the signal Sa to the lighting circuit 233, and is configured to include a resistor 500 and a buffer 501. The power supply voltage Vdd is applied to one end of the resistor 500, and the other end of the resistor 500 is connected to the terminal 320. Therefore, the resistor 500 functions as a so-called pull-up resistor.

[0033] Therefore, in the present embodiment, if the control unit 300 turns on the transistor 310, the signal Sa generated at the terminal 320 is at a low level (hereinafter referred to as the L level), and if the control unit 300 turns off the transistor M1, the signal Sa is at a high level (hereinafter referred to as the H level).

[0034] The buffer 501 outputs a signal S1 having the same logic level as the logic level of the input signal Sa to the lighting circuit 233. Specifically, if the input signal Sa is at the H level, the buffer 501 outputs a signal S1 at the H level, and if the input signal Sa is at the L level, the buffer 501 outputs a signal S1 at the L level.

[0035] Figure 5 FIG. is an example for explaining the signal S1. The control unit 300 of the present embodiment generates the signals Sa and S1 after pulse width modulation by turning on and off the transistor 310. Here, the period of the signal S1 as the PWM signal is set to T0, the period during which the signal S1 is at the H level in each period T0 is set to T1, and the period during which the signal S1 is at the L level in each period T0 is set to T2. In this case, the "duty ratio D (so-called on-duty ratio)" is represented by the following formula (1). D = T1 / (T1 + T2) = T1 / T0...(1)

[0036] <IF circuit 232> The IF circuit 232 is a circuit that outputs a signal S2 having the same logic level as the logic level of the signal Sb to the lighting circuit 222, and is configured to include a resistor 510 and a buffer 511. Since the resistor 510 and the buffer 511 of the IF circuit 232 are the same as the resistor 500 and the buffer 501 of the IF circuit 231, detailed description thereof is omitted here.

[0037] <Lighting circuit 233> The lighting circuit 233 performs PWM lighting (i.e., gradual lighting) of the lamp 12 in synchronization with the input signal S1. Specifically, the lighting circuit 233 supplies a current that increases as the duty ratio D of the signal S1 increases to the lamp 12.

[0038] However, the lighting circuit 233 has a dead zone in which it cannot supply current to the lamp 12 when the duty ratio D of the signal S1 is less than a predetermined value Da (for example, 3%). That is, when the duty ratio D of the signal S1 input to the lighting circuit 233 is less than the predetermined value Da, the lighting circuit 233 cannot light the lamp 12.

[0039] On the other hand, if the duty ratio D of the signal S1 becomes equal to or greater than the predetermined value Da, the lighting circuit 233 can supply current to the lamp 12 and light the lamp 12. Moreover, the lighting circuit 233 makes the brightness of the lamp 12 brighter as the duty ratio D increases. In the present embodiment, when the microcomputer 230 lights the lamp 12, it is necessary to change the duty ratio D of the signal Sa from the predetermined value Da (for example, 3%) instead of starting from 0%, and the details will be described later.

[0040] In addition, in the present embodiment, the lamp 12 is equivalent to the "first light source", the signal S1 is equivalent to the "first signal (or the first PWM signal)", and the lighting circuit 233 is equivalent to the "first lighting circuit". In addition, the duty cycle D of the signal S1 is equivalent to the "first duty cycle", and the duty cycle D of the signal S1 being equal to or greater than the predetermined value Da is equivalent to "the state of the first signal satisfies the first condition for lighting the lamp 12 (first light source)".

[0041] <<Light emitting module 221>> Figure 3 The light emitting module 221 is a module that lights up the lamp 22 based on the instruction signal SI in the same manner as the light emitting module 220, and is configured to include a microcomputer 240, an IF circuit 241, and a lighting circuit 242. Although not shown in the figure, the microcomputer 240 includes Figure 4 The control unit 300 and the transistor 310 in the microcomputer 230 are shown in FIG.

[0042] Therefore, the detailed description of the light emitting module 221 is omitted here, and the signal Sc generated in the microcomputer 240 and the signal S3 from the IF circuit 241 are PWM signals similar to the signals Sa and S1. In addition, the lighting circuit 242 is also the same as the lighting circuit 233, and has a dead zone in which the lamp 22 cannot be lit when the duty ratio D of the signal S3 is less than a predetermined value Da (for example, 3%).

[0043] Therefore, when the duty ratio D of the signal S3 becomes equal to or greater than the predetermined value Da, the lighting circuit 242 can light the lamp 22 , and the brightness of the lamp 22 becomes brighter as the duty ratio D increases.

[0044] In addition, here, the lamp 22 is equivalent to the "third light source", the signal S3 is equivalent to the "third signal", and the lighting circuit 242 is equivalent to the "third lighting circuit". In addition, the duty cycle D of the signal S3 becomes greater than the predetermined value Da, which is equivalent to "the state of the third signal satisfies the third condition for lighting the lamp 22 (third light source).

[0045] <<Lighting circuit 222>> Figure 3 The lighting circuit 222 shown in the figure performs PWM lighting of the auxiliary lamp L3 in synchronization with the input signal S2. Specifically, the lighting circuit 222 supplies the auxiliary lamp L3 with a current that increases as the duty ratio D of the signal S2 increases. Therefore, the auxiliary lamp L3 gradually lights up as the duty ratio D increases.

[0046] However, the lighting circuit 222 has a dead zone in which the auxiliary lamp L3 cannot be lit when the duty cycle D of the signal S2 is less than a predetermined value Db (for example, 4%). Therefore, if the duty cycle D of the signal S2 becomes greater than the predetermined value Db, the lighting circuit 222 can light the auxiliary lamp L3, and the brightness of the auxiliary lamp L3 increases as the duty cycle D increases.

[0047] In addition, in the present embodiment, the auxiliary lamp L2 corresponds to the "second light source", the signal S2 corresponds to the "second signal (or second PWM signal)", and the lighting circuit 222 corresponds to the "second lighting circuit". In addition, the duty cycle D of the signal S2 corresponds to the "second duty cycle", and the state in which the duty cycle D of the signal S2 becomes greater than or equal to the predetermined value Db corresponds to the second signal satisfying the second condition for lighting the auxiliary lamp L2 (second light source).

[0048] Here, the condition (second condition) under which the lighting circuit 222 lights the auxiliary lamp L3 is different from the condition (first condition) under which the lighting circuit 233 lights the lamp 12. This is because, for example, the circuits and elements constituting each lighting circuit 222, 233 are different, and the light-emitting elements constituting the lamp are different.

[0049] In the present embodiment, the microcomputer 230 and the IF circuits 231 and 232 correspond to a “first output circuit”, and the microcomputer 240 and the IF circuit 241 correspond to a “second output circuit”.

[0050] In addition, Figure 3 In the light emitting module 220, the microcomputer 230 and the IF circuits 231 and 232 are constituted by separate circuits, but the present invention is not limited thereto. For example, the microcomputer 230 may also be constituted to include the IF circuits 231 and 232. In this case, the microcomputer 230 corresponds to the "first output circuit".

[0051] In addition, the microcomputer 240 may be configured to include the IF circuit 241. In this case, the microcomputer 240 corresponds to the "second output circuit".

[0052] Processing of the control device 110 when the door of the vehicle C is unlocked Figure 6 1 is a flowchart showing an example of processing S10 executed by the control device 110 when the door of the vehicle C is unlocked. Figure 7 1 is a diagram showing an example of changes in the duty ratios of the signals S1 to S3 generated in the light emitting modules 220 and 221 .

[0053] In the present embodiment, the predetermined value Da is set to 3% and the predetermined value Db is set to 4%. Therefore, if the signals S1 and S3 with a duty ratio D of 3% or more are input, the lighting circuits 233 and 242 respectively light up the lamps 12 and 22. In addition, if the signal S2 with a duty ratio D of 4% or more is input, the lighting circuit 222 lights up the auxiliary lamp L3.

[0054] First, for example, Figure 7 At time t0, if the user operates a keyless device or the like to unlock the door of vehicle C, then Figure 2 The ECU 200 receives the operation result indicating the door unlocking (S20). Based on the operation result indicating the door unlocking, the ECU 200 outputs the instruction signal SI to the light emitting modules 220 and 221 to gradually light the lamps 12 and 22 and the auxiliary lamp L3 (S21).

[0055] As a result, the microcomputer 230 of the light emitting module 220 starts to generate the signals Sa and Sb, and the microcomputer 240 of the light emitting module 221 starts to generate the signal Sc (S22 and Figure 7 Here, in process S22, the microcomputer 230 sets the initial value D1 of the duty cycle D of the signal Sa to 4% (a value greater than the predetermined value Da), and sets the initial value D2 of the duty cycle D of the signal Sb to 4% (a value greater than the predetermined value Db).

[0056] In addition, the microcomputer 240 also sets the initial value D3 of the duty cycle D of the signal Sc to 4% (a value greater than the predetermined value Da). As described above, the duty cycles D of the signals S1 to S3 are equal to the duty cycles D of the signals Sa to Sc. Therefore, when the signals Sa to Sc are generated at time t1, the lighting circuits 233 and 242 light up the lamps 12 and 22, and the lighting circuit 222 lights up the auxiliary lamp L3.

[0057] Thus, in the present embodiment, the lamps 12, 22 and the auxiliary lamp L3 provided in front of the vehicle C are turned on at time t1, so that the timing of turning on the three lamps can be prevented from being deviated. In addition, the initial values ​​D1 to D3 of the signals Sa to Sc are respectively set to 4%, but are not limited thereto. In order to prevent the timing of turning on the lamps 12, 22 and the auxiliary lamp L3 from being deviated, the initial values ​​D1 and D3 can be set to 3% (predetermined value Da) or more, and the initial value D2 can be set to 4% (predetermined value Db) or more.

[0058] For example, the initial value D1 of the signal Sa may be set to 3%, the initial value D2 of the signal Sb may be set to 4%, and the initial value D3 of the signal Sc may be set to 5%, and they may be set to different values. In addition, the initial value D1 is equivalent to the "first initial value (or the first initial state)", and the initial value D2 is equivalent to the "second initial value (or the second initial state)". Furthermore, the initial value D3 is equivalent to the "third initial state".

[0059] Thereafter, the microcomputers 230 and 240 increase the duty cycle D of the signals Sa to Sc so that the brightness of the lamps 12, 22 and the auxiliary lamp L3 reaches a predetermined brightness (hereinafter referred to as "brightness A0 (e.g., 3000 candelas)") at time t2 after a period Ta has passed from time t1 (S23).

[0060] Specifically, microcomputer 230 increases duty cycle D of signal Sa to 30% and duty cycle D of signal Sb to 35% until time t2 (S23). Microcomputer 240 also increases duty cycle D of signal Sc to 30% until time t2, similarly to duty cycle D of signal Sa of microcomputer 230.

[0061] As described above, the signals S1 to S3 change in the same manner as the signals Sa to Sc. As a result, the lamps 12, 22 and the auxiliary lamp L3 are turned on at time t1 and then PWM-lit (ie, gradually lit) in synchronization with the signals S1 to S3 to reach a predetermined brightness A0 at time t2.

[0062] In the present embodiment, the lamps 12 and 22 are identical, and the lighting circuits 233 and 242 are also identical. Therefore, by changing the duty ratios D of the signals S1 and S3 in the same manner, the brightness of the lamps 12 and 22 can be made to change substantially in the same manner.

[0063] On the other hand, the auxiliary lamp L3 is different from the lamps 12 and 22, and the structure of the lighting circuit 222 is also different from the structure of the lighting circuits 233 and 242. However, the duty ratio D of the signal S2 is changed so that the auxiliary lamp L3 becomes a predetermined brightness A0 during a predetermined period Ta from lighting. Therefore, in this embodiment, the change in the brightness of the auxiliary lamp L3 can be set to be substantially the same as the change in the brightness of the lamps 12 and 22.

[0064] Thus, in the present embodiment, the brightness of each of the lamps 12 and 22 and the auxiliary lamp L3 disposed adjacent to each other in front of the vehicle C can be changed in the same manner.

[0065] Furthermore, the microcomputers 230 and 240 determine, for example, whether it is time t3 after a predetermined period Tb has elapsed from time t2 when the three lamps have a predetermined brightness A0 (S24). Until time t3, the microcomputers 230 and 240 continue to generate signals Sa to Sc for making the three lamps have a predetermined brightness A0 (S24: No).

[0066] On the other hand, when it becomes time t3, the microcomputers 230 and 240 set the duty ratios of the signals Sa to Sc to zero in order to turn off the three lamps (S24: Yes). As a result, the lamps 12, 22 and the auxiliary lamp L3 are turned off. In this way, in the present embodiment, even when the lighting circuits 233 and 242 and the lighting circuit 222 with different operating conditions are used, the deviation of the timing of lighting the three lamps can be suppressed, and the three lamps can be gradually lit to the predetermined brightness A0.

[0067] In addition, in the process S24, the microcomputers 230 and 240 generate signals Sa to Sc so that the three lamps are at a predetermined brightness A0 until the predetermined period Tb has passed, but the present invention is not limited thereto. For example, at time t2, when the user operates a part of the vehicle C (for example, an indicator for turning the headlights on or off, a button for starting the engine), the microcomputers 230 and 240 perform so-called interrupt processing and perform an action based on the instruction signal SI from the ECU 200. As a result, the three lamps may be turned off before time t3.

[0068] Other Implementations <Input voltage to lighting circuit> In the present embodiment, the lighting circuit such as the lighting circuit 222 is configured to light the lamp when the duty ratio of the input PWM signal reaches a predetermined value and to brighten the lamp as the duty ratio increases, but the present invention is not limited thereto.

[0069] For example, the lighting circuit may be a circuit that lights the lamp when the level of the input DC voltage reaches a predetermined value, and that becomes brighter as the level rises. Here, the lighting circuit X1 that lights the lamps 12 and 22 and the lighting circuit X2 that lights the auxiliary lamp L3 may have different operating conditions.

[0070] For example, if the DC voltage level is 0.6 V, the lighting circuit X1 lights the lamp 12, and if the DC voltage level is 3.0 V, the lighting circuit X1 lights the lamp 12 at a predetermined brightness A0. Furthermore, if the DC voltage level is 0.8 V, the lighting circuit X2 lights the auxiliary lamp L3, and if the DC voltage level is 3.5 V, the lighting circuit X2 lights the auxiliary lamp L3 at a predetermined brightness A0.

[0071] In this case, for example, as long as the microcomputer 230 outputs a DC voltage varying from 0.6V to 3.0V to the lighting circuit X1 and outputs a DC voltage varying from 0.8V to 3.5V to the lighting circuit X2 within the period Ta based on the indication signal SI, the same effect as that of the present embodiment can be obtained. <Current value setting>

[0072] Furthermore, for example, the lighting circuit 233 may be a circuit capable of setting the current value that the lighting circuit 233 can supply to the lamp 12 (ie, the current value supplied to the lamp 12 when the duty ratio D of the signal S1 is 30%) based on the duty ratio of a PWM signal different from the signal S1.

[0073] However, even if the lighting circuit 233 is such a circuit, in order to light the lamp 12 , it is necessary to input the signal S1 having a duty ratio D equal to or greater than the predetermined value Da to the lighting circuit 233 .

[0074] Summarize The vehicle lamp 100 according to the present embodiment has been described above. Figure 3 The lighting circuit 233 and the lighting circuit 222 of the lighting device 210 have different operating conditions when lighting the lamp. However, when lighting the lamp 12 and the auxiliary lamp L3, the microcomputer 230 of this embodiment generates signals Sa and Sb that can make the two lighting circuits 222 and 233 light up the target lamps together. Therefore, in this embodiment, the deviation of the timing of lighting the lamp 12 and the auxiliary lamp L3 can be suppressed.

[0075] The lighting circuit 233 performs PWM lighting of the auxiliary lamp L3, and the lighting circuit 222 performs PWM lighting of the lamp 12. However, the lighting circuits 222 and 233 may light symmetrical lamps, for example, according to the level of the input DC voltage.

[0076] In addition, the lighting circuit 233 can gradually light up the auxiliary lamp L3 according to the duty ratio of the signal S1, and the lighting circuit 222 can gradually light up the lamp 12 according to the duty ratio of the signal S2.

[0077] In addition, the microcomputer 230 generates signals Sa and Sb so that the lamp 12 and the auxiliary lamp L3 are turned on for a predetermined period Ta (see Figure 7 ) becomes a predetermined brightness A1. As a result, in the present embodiment, the changes in the brightness of the lamp 12 and the auxiliary lamp L3 can be made substantially the same. Therefore, even during the period when the brightness of the lamp 12 and the auxiliary lamp L3 changes, the deviation of the brightness of the two can be suppressed.

[0078] Furthermore, the lighting device 210 is provided with a light emitting module 221 for lighting the lamp 22. Therefore, in the present embodiment, it is possible to suppress the deviation in the timing of lighting the lamps 12, 22 and the auxiliary lamp L3.

[0079] In addition, if Figure 1 As shown, the auxiliary lamp L3 is arranged between the left lamp 12 and the right lamp 22 in front of the vehicle C. In this embodiment, the difference between the timing of lighting the auxiliary lamp L3 adjacent to the lamps 12 and 22 and the timing of lighting the lamps 12 and 22 can be suppressed.

[0080] Furthermore, the microcomputer 230 gradually lights the lamp 12 and the auxiliary lamp L3 when the keyless device or the like is operated to unlock the door of the vehicle C. Therefore, the user of the vehicle C can approach the vehicle C safely, particularly at night.

[0081] The above-mentioned embodiments are for easy understanding of the present invention, and are not intended to limit the interpretation of the present invention. In addition, the present invention can be changed and improved without departing from the gist thereof, and the present invention also includes its equivalents.

[0082] This international application claims the benefit of priority based on Japanese Patent Application No. 2022-080878, filed on May 17, 2022, and incorporates the entire contents of Japanese Patent Application No. 2022-080878 into this international application.

[0083] The above descriptions of specific embodiments of the present invention are provided for the purpose of illustration. They are comprehensive and are not intended to limit the present invention to the described embodiments themselves. A large number of modifications and changes can be made with reference to the above described contents, which will be apparent to those skilled in the art. Description of Reference Numerals

[0084] 10~12、20~22 lights 100 Vehicle lighting 110 Control Device 200ECU 210 lighting device 220, 221 light emitting module 222, 233, 242 lighting circuit 230, 240 microcomputer 231, 232, 241IF circuit 300 Control Department 310, 311 transistors 320, 321 terminals 500, 510 resistors 501, 511 buffer C Vehicle L1, L2 headlights L3 auxiliary light.

Claims

1. A lighting device, characterized in that: have: a first lighting circuit, which lights up the first light source if the state of the first signal satisfies a first condition, and changes the brightness of the first light source according to the state of the first signal; a second lighting circuit, which lights up the second light source if the state of the second signal satisfies a second condition different from the first condition, and changes the brightness of the second light source according to the state of the second signal; as well as The first output circuit, based on the indication signal, outputs the first signal whose state changes from a first initial state satisfying the first condition to the first lighting circuit, so that the first light source is lit and gradually becomes brighter, and outputs the second signal whose state changes from a second initial state satisfying the second condition to the second lighting circuit, so that the second light source is lit and gradually becomes brighter.

2. The lighting device according to claim 1, characterized in that: The first lighting circuit enables the first light source to be lit by PWM. The second lighting circuit causes the second light source to perform PWM lighting.

3. The lighting device according to claim 2, characterized in that: The first output circuit outputs a first PWM signal whose first duty ratio changes from a first initial value satisfying the first condition as the first signal, and outputs a second PWM signal whose second duty ratio changes from a second initial value satisfying the second condition as the second signal based on the indication signal. The first lighting circuit performs PWM lighting of the first light source in synchronization with the first PWM signal, and changes the brightness of the first light source according to the first duty ratio of the first PWM signal. The second lighting circuit performs PWM lighting of the second light source in synchronization with the second PWM signal, and changes the brightness of the second light source according to the second duty ratio of the second PWM signal.

4. The lighting device according to claim 3, characterized in that: The first output circuit changes the first duty ratio and the second duty ratio so that the first light source and the second light source each have a predetermined brightness during a predetermined period from lighting.

5. The lighting device according to any one of claims 1 to 4, characterized in that: have: a third lighting circuit, which lights up the third light source if the state of the third signal satisfies a third condition, and changes the brightness of the third light source according to the state of the third signal; as well as The second output circuit outputs the third signal, which changes its state from a third initial state satisfying the third condition, to the third lighting circuit based on the instruction signal, so as to light up the third light source and gradually become brighter.

6. A vehicle lamp, characterized in that: have: The lighting device according to claim 5; and The first to third light sources are arranged in front of the vehicle. The second light source is disposed between the first light source and the third light source.

7. A lighting device that lights up a first light source and a second light source installed in a vehicle, The lighting device is characterized by comprising: a first lighting circuit, which lights up the first light source if the state of the first signal satisfies a first condition, and changes the brightness of the first light source according to the state of the first signal; a second lighting circuit, which lights up the second light source if the state of the second signal satisfies a second condition different from the first condition, and changes the brightness of the second light source according to the state of the second signal; as well as The first output circuit, if the door of the vehicle is unlocked, outputs the first signal whose state changes from a first initial state that satisfies the first condition to the first lighting circuit, so that the first light source is lit and gradually becomes brighter, and outputs the second signal whose state changes from a second initial state that satisfies the second condition to the second lighting circuit, so that the second light source is lit and gradually becomes brighter.

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