Rear steering lamp

Abstract

The first lamp unit (200) sequentially lights the plurality of first light-emitting elements (202) when the steering synchronization signal (TURN +) is at a high level and the sequential lighting prohibition signal (S1) is set to be invalid, and transmits a lighting instruction signal (S2) to the second lamp unit (300) after the lighting of the plurality of first light-emitting elements (202) is completed. The first lamp unit (200) simultaneously lights the plurality of first light emitting elements (202) and transmits a lighting instruction signal (S2) to the second lamp unit (300) when the steering synchronization signal (TURN) is at a high level and the sequential lighting prohibition signal (S1) is valid. The second lamp unit (300) lights the second light-emitting element (302) in response to the lighting instruction signal (S2).

Description

Technical Field

[0001] The present disclosure relates to vehicle lamps. Background Art

[0002] Among vehicle lamps (referred to as combination lamps or simply rear lamps) provided at the rear of an automobile, there are lamps that straddle movable parts such as a trunk lid or a rear hatch and the vehicle body side. Such a rear lamp is formed by dividing it into a housing on the movable part side and a housing on the vehicle body side.

[0003] A turn signal (turn indicator) is provided in the rear lamp. In recent years, in some vehicles, a turn signal that is sequentially lit in a forward transmission manner (hereinafter, referred to as a sequential turn signal) has been mounted.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: International Publication No. WO2019 / 208545 Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] There are vehicles equipped with an ESS (Emergency Stop Signal) function that rapidly turns on and off the hazard warning lamp during emergency braking to notify the following vehicle that the emergency brake has been depressed. In vehicles that support the ESS function, the sequential lighting of the turn signal is not ideal during the lighting of the ESS.

[0009] One exemplary object of one aspect of the present disclosure, which was obtained in the relevant situation, is to provide a split-type rear turn signal capable of canceling sequential lighting.

[0010] Method for Solving the Technical Problem

[0011] A rear turn signal lamp according to an aspect of the present disclosure includes: a first lamp unit disposed on a movable part of a vehicle body and including a plurality of first light-emitting elements; and a second lamp unit disposed on a fixed part of the vehicle body and including a second light-emitting element. The first lamp unit can receive a steering synchronization signal and a sequential lighting prohibition signal from the vehicle and can send a lighting instruction signal to the second lamp unit. The second lamp unit can receive a steering synchronization signal from the vehicle and can receive a lighting instruction signal from the first lamp unit. The first lamp unit sequentially lights the plurality of first light-emitting elements when (i) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is invalid, and after the lighting of the plurality of first light-emitting elements is completed, sends the lighting instruction signal to the second lamp unit. When (ii) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is valid, the first lamp unit simultaneously lights the plurality of first light-emitting elements and sends the lighting instruction signal to the second lamp unit. The second lamp unit lights the second light-emitting element in response to the lighting instruction signal.

[0012] It should be noted that a solution obtained by arbitrarily combining the above-described constituent elements and a solution obtained by mutually converting the constituent elements or expressions between methods, devices, systems, etc. are also effective as the solution of the present invention or the present disclosure. In addition, the description of this item (the method for solving the technical problem) does not describe all the essential features indispensable to the present invention. Therefore, a sub-combination of these described features can also be regarded as the present invention.

[0013] Advantageous Effects of the Invention

[0014] According to an aspect of the present disclosure, it is possible to provide a split-type rear turn signal lamp capable of canceling sequential lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 (a) of is an external view of an automobile equipped with a rear turn signal lamp, Figure 1 and (b) of is a view showing the rear turn signal lamp on the left side.

[0016] Figure 2 is a block diagram of the rear turn signal lamp according to the embodiment.

[0017] Figure 3 is a timing chart showing the operation of the rear turn signal lamp in a normal state.

[0018] Figure 4 is a timing chart showing the operation of the rear turn signal lamp when sequential lighting is prohibited.

[0019] Figure 5 is a block diagram showing a configuration example of the rear turn signal lamp.

[0020] Figure 6 is a circuit diagram of the ESS input interface circuit according to Embodiment 1.

[0021] Figure 7 It is a circuit diagram of the ESS input interface circuit of Embodiment 2. Specific Embodiments

[0022] (Summary of the Embodiment)

[0023] The summary of several exemplary embodiments of the present disclosure is described. This summary serves as a preface to the subsequent detailed description. For the purpose of a basic understanding of the embodiments, several concepts of one or more embodiments are briefly described, and it is not intended to limit the scope of the invention or the disclosure. This summary is not an all-inclusive summary of all the embodiments to be considered, and it is not intended to limit the important elements of all the embodiments, nor to delimit the scope of a part or all of the solutions. For convenience, "an embodiment" is sometimes used to indicate one embodiment (example or variant) or multiple embodiments (examples or variants) disclosed in this specification.

[0024] The rear turn signal of an embodiment includes: a first lamp unit disposed on a movable part of the vehicle body and including a plurality of first light-emitting elements; and a second lamp unit disposed on a fixed part of the vehicle body and including a second light-emitting element. The first lamp unit can receive a steering synchronization signal and a sequential lighting prohibition signal from the vehicle and can send a lighting instruction signal to the second lamp unit. The second lamp unit can receive the steering synchronization signal from the vehicle and can receive the lighting instruction signal from the first lamp unit. The first lamp unit sequentially lights the plurality of first light-emitting elements when (i) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is invalid, and after completing the lighting of the plurality of first light-emitting elements, sends the lighting instruction signal to the second lamp unit. When (ii) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is valid, the first lamp unit simultaneously lights the plurality of first light-emitting elements and sends the lighting instruction signal to the second lamp unit, and the second lamp unit lights the second light-emitting element in response to the lighting instruction signal.

[0025] According to this configuration, normal sequential lighting is performed by setting the sequential lighting prohibition signal to invalid. When the sequential lighting prohibition signal is made valid in the case of a special event such as an emergency brake, the sequential lighting is aborted and general on / off can be immediately performed.

[0026] In one embodiment, the sequential lighting prohibition signal can be a signal that is valid at a low level and invalid at a high impedance. The first lamp unit can include a receiving circuit for the sequential lighting prohibition signal. The receiving circuit can include: an input pin for receiving the sequential lighting prohibition signal; a capacitor connected to the input pin; a resistor with one end grounded; and a PNP transistor that receives the steering synchronization signal at the emitter, is connected to the input pin at the base, and has the collector connected to the second end of the resistor.

[0027] In one embodiment, the sequential lighting prohibition signal may be a signal that is active low and has a high impedance when inactive. The first lighting unit may include a receiving circuit for the sequential lighting prohibition signal. The receiving circuit may include: an input pin for receiving the sequential lighting prohibition signal; a variable resistor connected to the input pin; a resistor with its first end grounded; and a PNP transistor that receives the steering synchronization signal at the emitter, and whose base and collector are connected to the second end of the resistor. If a large electrostatic capacitance is connected to the input pin, when the steering synchronization signal transitions to a high level, there is a possibility that the base of the PNP transistor remains at a low level, the emitter becomes a high voltage, and the PNP transistor turns on. Therefore, by connecting a variable resistor with a small electrostatic capacitance to the input pin, the PNP transistor can be prevented from turning on.

[0028] In one embodiment, the first lighting unit may include: a converter that uses the steering synchronization signal as a power source to supply a constant current to a plurality of first light-emitting elements connected in series; a plurality of bypass switches connected in parallel with the plurality of first light-emitting elements; a converter that uses the steering synchronization signal as a power source to supply a constant current to the plurality of first light-emitting elements connected in series; and a lighting control circuit that uses the steering synchronization signal as a power source and, when the steering synchronization signal transitions to a high level, sequentially turns off the plurality of bypass switches, and when the sequential lighting prohibition signal is active, turns off the plurality of bypass switches simultaneously.

[0029] (Embodiment)

[0030] Next, for a preferred embodiment, an explanation will be given while referring to the drawings. For the same or equivalent components, parts, and processes shown in each drawing, the same reference numerals are used, and repeated explanations are appropriately omitted. In addition, the embodiment is for illustration and not for limiting the disclosure and the invention, and not all features or their combinations described in the embodiment are essential parts of the disclosure and the invention.

[0031] In this specification, the so-called "state where component A is connected to component B" includes the case where component A and component B are physically directly connected, and also includes the case where component A and component B are indirectly connected via other components that do not substantially affect their electrical connection state or do not impair the functions or effects achieved through their coupling.

[0032] Similarly, the so-called "state where component C is disposed between component A and component B" means that, in addition to the cases of directly connecting component A and component C or directly connecting component B and component C, it also includes the case of being indirectly connected via other components without substantially affecting their electrical connection state or without impairing the functions or effects achieved through their coupling.

[0033] Figure 1FIG. (a) is an external view of an automobile 500 equipped with rear turn signals 100. The rear turn signals 100L and 100R are respectively installed at the left and right rear sides of the automobile 500. The automobile 500 has a fixed part 502 and a movable part 504. The movable part 504 may be a trunk lid as shown in Figure 1 FIG. (a). Alternatively, in other embodiments, the movable part 504 may be a rear hatch. The rear turn signal 100 is provided by being divided into a fixed part 502 side and a movable part 504 side.

[0034] Figure 1 FIG. (b) is a view showing the left rear turn signal 100L. In addition, the rear turn signal 100R is configured symmetrically with the left and right of the rear turn signal 100L.

[0035] The rear turn signal 100L is divided into a first lamp unit 200 and a second lamp unit 300. The first lamp unit 200 and the second lamp unit 300 have separate housings. The first lamp unit 200 is fixed to the movable part 504 side, and the second lamp unit 300 is fixed adjacent to the movable part 504 on the fixed part 502 side. The first lamp unit 200 may also be referred to as an inner lamp unit, and the second lamp unit 300 may be referred to as an outer lamp unit.

[0036] In the first lamp unit 200 and the second lamp unit 300, a plurality of first light-emitting elements 202 and second light-emitting elements 302 are substantially arranged adjacent to each other in the horizontal direction. The rear turn signal 100L is a so-called sequential turn signal. When turning left, the plurality of light-emitting elements 202 and 302 are lit in sequence in the arrow direction from the inside of the vehicle body (right side in the figure) toward the outside (left side in the figure). The light-emitting element 202 is typically an LED (light-emitting diode), but other semiconductor light sources such as an LD (laser diode) or an organic EL (ElectroLuminescence) element can also be used.

[0037] Figure 2 is a block diagram of the rear turn signal 100 of the embodiment. The rear turn signal 100 includes a first lamp unit 200 and a second lamp unit 300.

[0038] As described above, the first lamp unit 200 is provided on the movable part of the vehicle body, and the second lamp unit 300 is provided on the fixed part of the vehicle body.

[0039] The first lamp unit 200 includes a plurality of n (n≧2) first light-emitting elements 202_1 to 202_n that can be individually turned on and off, and a first driving module 210. The second lamp unit 300 includes a second light-emitting element 302 and a second driving module 310. The first light-emitting element 202 and the second light-emitting element 302 are semiconductor light-emitting elements such as LEDs (light-emitting diodes).

[0040] The rear turn signal 100 is connected to an ECU (Electronic Control Unit) on the vehicle side via the vehicle wiring harness 150. The rear turn signal 100 receives a steering synchronization signal TURN+ and a sequential lighting inhibition signal S1 from the vehicle side.

[0041] The lighting instruction for the rear turn signal 100 from the vehicle is supplied as the steering synchronization signal TURN+ via the power supply line 151 of the vehicle wiring harness. The steering synchronization signal TURN+ is the main power supply for the rear turn signal 100, and is a pulse signal that is at a high level (i.e., the power supply voltage) during the lighting period (on) of the rear turn signal 100 and at a low level (i.e., the ground voltage) during the extinguishing period (off). Usually, the turn signal repeats lighting and extinguishing at a cycle of 1 - 2 Hz (60 - 120 times per second). For example, when set to 1.5 Hz, the lighting cycle is 666 ms. The steering synchronization signal TURN+ is at a high level during the first half of 333 ms and at a low level during the remaining second half of 333 ms.

[0042] The rear turn signal 100 is capable of performing sequential lighting in which a plurality of first light emitting elements 202 and second light emitting elements 302 are lit in sequence. Specifically, when the steering synchronization signal TURN+ is at a high level, they are lit in the order of the light emitting elements 202_1, 202_2,... 202_n, 302, and when the steering synchronization signal TURN+ is at a low level, all the light emitting elements 202_1, 202_2,... 202_n, 302 are extinguished simultaneously.

[0043] The sequential lighting inhibition signal S1 is a signal that indicates the permission or inhibition of sequential lighting, and takes two states. The rear turn signal 100 performs sequential lighting when the sequential lighting inhibition signal S1 is in the first state (invalid). When the sequential lighting inhibition signal S1 is in the second state (valid), the rear turn signal 100 does not perform sequential lighting, and when the steering synchronization signal TURN is at a high level, all the light emitting elements 202_1, 202_2,... 202_n, 302 are lit simultaneously, and when the steering synchronization signal TURN is at a low level, all the light emitting elements 202_1, 202_2,... 202_n, 302 are extinguished simultaneously.

[0044] The sequential lighting inhibition signal S1 is placed in the valid state (ESS (Emergency Stop Signal)) when the vehicle equipped with the rear turn signal 100 performs emergency braking and causes the hazard warning lamp to flash quickly, for example. Or, the sequential lighting inhibition signal S1 can be made valid when it is required to perform the previous simultaneous lighting and extinguishing without being related to emergency braking.

[0045] For example, the sequential lighting prohibition signal S1 can be a low-level active signal that takes a high-impedance state corresponding to invalid and a low level corresponding to valid. Alternatively, the sequential lighting prohibition signal S1 can be a high-level active signal that takes a high-impedance state corresponding to invalid and a high level corresponding to valid. Alternatively, the sequential lighting prohibition signal S1 can also take a binary signal with a low level corresponding to invalid and a high level corresponding to valid.

[0046] The first driving module 210 of the first lighting unit 200 can receive the steering synchronization signal TURN+ and the sequential lighting prohibition signal S1 from the vehicle. In addition, the PGO pin of the first driving module 210 is connected to the PGI pin of the second driving module 310, and can send a lighting instruction signal S2 to the second driving module 310 of the second lighting unit 300. The second driving module 310 can receive the steering synchronization signal TURN+ from the vehicle and can receive the lighting instruction signal S2 from the first lighting unit 200.

[0047] The PGO pin of the second driving module 310 is connected to the PGI pin of the first driving module 210. When there is no abnormality in the second driving module 310 and the lighting operation ends, the second driving module 310 makes the detection signal S3 valid (for example, high voltage Hi) and outputs it to the first driving module 210.

[0048] The first lighting unit 200, when (i) the steering synchronization signal TURN+ is at a high level and the sequential lighting prohibition signal S1 is invalid, sequentially lights up a plurality of first light-emitting elements 202_1 to 202_2. After completing the lighting of the plurality of first light-emitting elements 202_1 to 202_n, the first lighting unit 200 sends a lighting instruction signal S2 that makes the second light-emitting element 302 reach a specified state (valid, for example, high level) at the time of lighting to the second lighting unit 300.

[0049] In addition, when the first lighting unit 200 detects the validity of the sequential lighting prohibition signal S1 during (ii) the period when the steering synchronization signal TURN+ is at a high level, in response to this validity, the first lighting unit 200 simultaneously lights up a plurality of first light-emitting elements 202_1 to 202_n and directly sends the lighting instruction signal S2 to the second lighting unit.

[0050] The second lighting unit 300 lights up the second light-emitting element 302 in response to the lighting instruction signal S2.

[0051] The above is the structure of the rear turn signal 100. Next, its operation will be described.

[0052] Figure 3is a timing chart showing the operation of the rear turn signal 100 in the normal state. In this example, it is assumed that the sequential lighting inhibition signal S1 takes the high impedance state (HiZ) when sequential lighting is permitted, and takes the low level (L) when sequential lighting is prohibited. In addition, in Figure 2 it is assumed that the number n of the first light emitting elements 202 is 3, and LED1, LED2, and LED3 indicate lighting (high level) / extinguishing (low level) of the first light emitting elements 202_1 to 202_3, and LED4 indicates lighting / extinguishing of the second light emitting element 302.

[0053] At time t 0 when the turn synchronization signal TURN+ becomes high level, the first drive module 210 and the second drive module 310 are activated. Since the sequential lighting inhibition signal S1 is in the high impedance HiZ state, the first drive module 210 at time t 1 、t 2 、t 3 causes the plurality of first light emitting elements 202_1 to 202_3 to be lit in sequence. And the second light emitting element 302 makes the lighting instruction signal S2 effective at the lighting time t 4 In response to the effectiveness of the lighting instruction signal S2, the second drive module 310 lights the second light emitting element 302.

[0054] Thereafter, at time t 5 when the turn synchronization signal TURN+ becomes low level, the first drive module 210 and the second drive module 310 stop, and all the light emitting elements 202_1 to 202_3 and the second light emitting element 302 are extinguished.

[0055] At time t 6 and later, in synchronization with the turn synchronization signal TURN+, the same operation as that at time t 0 ~t 6 is repeated.

[0056] Figure 4 is a timing chart showing the operation of the rear turn signal 100 when sequential lighting is prohibited.

[0057] At time t 0 when the turn synchronization signal TURN+ becomes high level, the first drive module 210 and the second drive module 310 are activated. First, the sequential lighting inhibition signal S1 is in the high impedance HiZ state. The first drive module 210 at the time t 1 after lighting the first light emitting element 202_1 and at the subsequent time t 2, the sequential lighting prohibition signal S1 is set to valid (low level). When the first driving module 210 detects the validity of the sequential lighting prohibition signal S1, it lights all the light-emitting elements 202_1 to 203_3 and makes the lighting indication signal S2 valid. The second driving module 310 lights the second light-emitting element 302 in response to the validity of the lighting indication signal S2. At time t 3 , when the steering synchronization signal TURN+ is at a low level, the first driving module 210 and the second driving module 310 stop, and all the light-emitting elements 202_1 to 202_3 and the second light-emitting element 302 are turned off.

[0058] At time t 4 , the steering synchronization signal TURN+ becomes high level. At this time, since the sequential lighting prohibition signal S1 has been set to valid, when the first driving module 210 detects the validity of the sequential lighting prohibition signal S1, it immediately lights the first light-emitting elements 202_1 to 202_3 and makes the sequential lighting prohibition signal S1 valid (t5). The second driving module 310 lights the second light-emitting element 302 in response to the validity of the lighting indication signal S2.

[0059] The above is the operation of the rear turn signal 100. In this way, when the sequential lighting prohibition signal S1 is set to valid, the rear turn signal 100 can abort the sequential lighting and turn on all the light-emitting elements 202_1 to 202_3 and 302.

[0060] This disclosure is understood as Figure 2 a block diagram, or relates to various devices and methods derived from the above description, and is not limited to a specific configuration. Hereinafter, in order to assist in understanding the essence or operation of this disclosure or the present invention, and also to further clarify it, more specific configuration examples or embodiments will be described, rather than to limit the scope of this disclosure.

[0061] Figure 5 is a block diagram showing a configuration example of the rear turn signal 100.

[0062] First, a configuration example of the first driving module 210 will be described. The input filter 224 removes the noise of the steering synchronization signal TURN+, which is both the power supply and the lighting indication of the first driving module 210. The steering synchronization signal TURN+ is supplied as the power supply voltage V CC to each block of the first driving module 210.

[0063] Converter 212 enters the operating state when the steering synchronization signal TURN+ goes high. For example, converter 212 is a buck-boost converter, and in the operating state, the output is stabilized to a drive current ILED of a specified target current. The form of converter 212 (buck, boost, buck-boost) can be selected according to the number n of the first light-emitting elements 202. The output filter 216 removes the noise (ripple) contained in the drive current ILED.

[0064] The bypass circuit 214 is connected to the first light-emitting elements 202_1 to 202_n. The bypass circuit 214 is configured to be able to switch between n + 1 states

[0065] The state in which all the first light-emitting elements 202 are turned off

[0066] The state in which only the first light-emitting element 202_1 is turned on

[0067] The state in which the first light-emitting elements 202_1 and 202_2 are turned on

[0068] …

[0069] The state in which the first light-emitting elements 202_1 to 202_(n - 1) are turned on

[0070] The state in which all the first light-emitting elements 202_1 to 202_n are turned on

[0071] For example, the bypass circuit 214 includes a plurality of switches SW1 to SWn. The i-th (i = 1, 2,... n) switch SW1 is connected between the anode of the corresponding first light-emitting element 202_i and the ground.

[0072] In the state Switch SW1 is turned on. Switches SW2 to SWn can be either turned on or off, but are set to be turned on.

[0073] In the state SW1 is turned off and switch SW2 is turned on. Switches SW3 to SWn can be either turned on or off, but are set to be turned on.

[0074] In the state SW1 and SW2 are turned off and switch SW3 is turned on. Switches SW4 to SWn can be either turned on or off, but are set to be turned on.

[0075] …

[0076] In the state SW1 to SWn - 1 are turned off and switch SWn is turned on.

[0077] The timer circuit 222 starts operating when the turn synchronization signal TURN+ (power supply voltage) is supplied, and generates a control signal CNT for switching the state of the bypass circuit 214. In addition, the timer circuit 222 enables the timing signal S4 indicating the timing at which the second light-emitting element 302 of the second lamp unit 300 should light up.

[0078] The power-off timer 226 receives the timing signal S4 from the timer circuit 222 and the detection signal S3 from the second lamp unit 300 indicating the completion of the lighting operation. If the detection signal S3 indicating the end of lighting of the second drive module 310 is not detected as valid within a specified time after the timing signal S4 indicating the start of lighting of the second drive module 310 is enabled, the power-off timer 226 determines that the second lamp unit 300 is abnormal and turns off the first light-emitting element 202 on the side of the first lamp unit 200.

[0079] The ESS input interface circuit 218 is a receiving circuit that monitors the electrical state of the input pin ESS of the sequential lighting prohibition signal S1 and determines the validity or invalidity of the sequential lighting prohibition signal S1. When the sequential cancellation circuit 220 detects that the sequential lighting prohibition signal S1 is valid, it outputs a sequential cancellation signal S5 to the timer circuit 222. When the sequential cancellation signal S5 is input to the timer circuit 222, regardless of the elapsed time, the timer circuit 222 generates a control signal CNT for the bypass circuit 214 to enter a state and enables the timing signal S4.

[0080] The open-circuit detection circuit 228 detects, for example, an open-circuit abnormality in the output line of the converter 212. When the open-circuit detection circuit 228 detects an abnormality, it enables the abnormality detection signal ABN (high level). In addition, the converter 212 has an abnormality detection function and enables the fault signal FLT (high level) when an abnormality is detected internally.

[0081] The logic gate 230 performs a logical operation on the timing signal S4, the abnormality detection signal ABN, and the fault signal FLT to generate a lighting instruction signal S2'. The lighting instruction signal S2' outputs the timing signal S4 as the lighting instruction signal S2' when the abnormality detection signal ABN and the fault signal FLT are at a low level. When at least one of the abnormality detection signal ABN and the fault signal FLT is at a low level, the lighting instruction signal S2' is fixed at a low level.

[0082] The mutual monitoring output interface circuit 232 receives the lighting instruction signal S2' and outputs the lighting instruction signal S2.

[0083] The mutual monitoring input interface circuit 234 receives the detection signal S3 from the second drive module 310.

[0084] The above is the structure of the first lighting unit 200. Next, the configuration of the second lighting unit 300 will be described.

[0085] The input filter 324 removes the noise of the power supply and lighting indication, i.e., the steering synchronization signal TURN+, of the second drive module 31. The steering synchronization signal TURN+ is supplied as the power supply voltage V CC to each block of the second drive module 310.

[0086] The open circuit detection circuit 328 detects, for example, an open circuit abnormality in the output line of the converter 312. When the open circuit detection circuit 228 detects an abnormality, it makes the abnormality detection signal ABN valid (high level). In addition, the converter 312 has an abnormality detection function and makes the abnormality detection signal OPENLED valid (high level) when an abnormality (such as an open circuit fault of the load) is detected internally.

[0087] The logic gate 330 performs a logical operation on the abnormality detection signals ABN and OPENLED to generate a detection signal S3'. The detection signal S3' is made valid when at least one of the abnormality detection signals ABN and OPENLED is made valid. The mutual monitoring output interface circuit 332 receives the detection signal S3' and outputs the detection signal S3.

[0088] The mutual monitoring input interface circuit 334 receives the lighting indication signal S2 from the first drive module 210.

[0089] The converter 312 becomes the operating state when the steering synchronization signal TURN+ becomes high level and the lighting indication signal S2 is input. For example, the converter 312 is a boost converter, and in the operating state, the output is stabilized to a driving current I of a specified target current LED . The output filter 316 removes the noise (ripple) contained in the driving current I LED .

[0090] The above is the structure of the second lighting unit 300.

[0091] Next, an example of the configuration of the ESS input interface circuit 218 will be described. Figure 6 is the circuit diagram of the ESS input interface circuit 218A of Embodiment 1. The sequential lighting prohibition signal S1 is a signal that is valid at a low level and invalid at a high impedance HiZ.

[0092] The ESS input interface circuit 218A includes a PNP transistor Q1, resistors R1 to R3, capacitors C1, C2, and a diode D1.

[0093] The capacitor C1 is connected to the input pin ESS for electrostatic breakdown protection. The first end of the resistor R1 is grounded. The collector of the PNP transistor Q1 is connected to the resistor R1, and its emitter is supplied with the input power supply voltage V CC , and its base is connected to the input pin ESS via the resistor R3 and the diode D1. A capacitor C2 and a resistor R2 are connected between the base and emitter of the transistor Q1.

[0094] When the sequential lighting prohibition signal S1 is at a high impedance (invalid), the base of the transistor Q1 is pulled up by the resistor R2, the voltage between the base and emitter of the transistor Q1 becomes 0V, and the transistor Q1 is cut off. Therefore, the output DET of the ESS input interface circuit 218A becomes low level.

[0095] When the sequential lighting prohibition signal S1 is at a low level (valid), the base of the transistor Q1 becomes 0V, the transistor Q1 becomes conductive, and a current flows through the resistor R1. Therefore, the output DET of the ESS input interface circuit 218A becomes high level.

[0096] Figure 6 The circuit is effective when the capacitance of the capacitor C1 is small and the rising speed of the steering synchronization signal TURN+ is slow.

[0097] When the rising edge of the steering synchronization signal TURN+ is fast and / or the capacitance of the capacitor C1 is large, when the emitter voltage V of the transistor Q1 CC rises, the rise of the base voltage of the transistor Q1 is slow. Therefore, the voltage between the base and emitter becomes large for a short time, the transistor Q1 becomes conductive, and the output DET of the ESS input interface circuit 218A instantaneously becomes high level, and there is a possibility of false detection.

[0098] Figure 7 is a circuit diagram of the ESS input interface circuit 218B of the second embodiment. The ESS input interface circuit 218B includes a variable resistor VS1 instead of Figure 6 the capacitor C1. The variable resistor VS1 functions as an electrostatic breakdown prevention element for the input pin ESS. The variable resistor VS1 can select a component having an electrostatic capacitance smaller than that of the capacitor C1. Therefore, by using such a component, when the power supply voltage V CC rises, the voltage rise of the base (ESS pin) of the transistor Q1 can be accelerated, and false detection can be prevented.

[0099] According to the embodiment, the present invention is described using specific statements. However, the embodiment only shows one aspect of the principle and application of the present invention. For the embodiment, various modifications or configuration changes are allowed within the scope not departing from the idea of the present invention defined in the claims.

[0100] Industrial availability

[0101] The present invention relates to a vehicle lamp.

[0102] Description of reference numerals

[0103] 100... Rear turn signal, 200... First lamp unit, 202... First light-emitting element, 210... First drive module, 212... Converter, 214... Bypass circuit, 216... Output filter, 218... ESS input interface circuit, 220... Sequence cancellation circuit, 222... Timer circuit, 224... Input filter, 226... Power-off timer, 228... Open-circuit detection circuit, 230... Logic gate, 232... Mutual monitoring output interface circuit, 234... Mutual monitoring input interface circuit, 300... Second lamp unit, 302... Second light-emitting element, 310... Second drive module, 312... Converter, 316... Output filter, 324... Input filter, 328... Open-circuit detection circuit, 330... Logic gate, 332... Mutual monitoring output interface circuit, 334... Mutual monitoring input interface circuit, S1... Sequence lighting prohibition signal, S2... Lighting indication signal, S3... Detection signal, 500... Automobile, 502... Fixed part, 504... Movable part.

Claims

1. A rear turn signal lamp, characterized in that, comprising: A first lamp unit, which is arranged on a movable part of the vehicle body and includes a plurality of first light-emitting elements, and A second lamp unit, which is arranged on a fixed part of the vehicle body and includes a second light-emitting element; The first lamp unit can receive a steering synchronization signal and a sequential lighting prohibition signal from the vehicle, and can send a lighting instruction signal to the second lamp unit, The second lamp unit can receive the steering synchronization signal from the vehicle and can receive the lighting instruction signal from the first lamp unit, When (i) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is invalid, the first lamp unit sequentially lights the plurality of first light-emitting elements, and after the lighting of the plurality of first light-emitting elements is completed, sends the lighting instruction signal to the second lamp unit. When (ii) the steering synchronization signal is at a high level and the sequential lighting prohibition signal is valid, the first lamp unit simultaneously lights the plurality of first light-emitting elements and sends the lighting instruction signal to the second lamp unit, The second lamp unit lights the second light-emitting element in response to the lighting instruction signal.

2. The rear turn signal lamp according to claim 1, characterized in that, The sequential lighting prohibition signal is a signal that is valid at a low level and invalid at a high impedance, The first lamp unit includes a receiving circuit for the sequential lighting prohibition signal, The receiving circuit includes: An input pin for receiving the sequential lighting prohibition signal; A capacitor connected to the input pin; A resistor with a first end grounded; and A PNP-type transistor, which receives the steering synchronization signal at the emitter, has a base connected to the input pin, and a collector connected to the second end of the resistor.

3. The rear turn signal lamp according to claim 1, characterized in that, The sequential lighting prohibition signal is a signal that is valid at a low level and invalid at a high impedance, The first lamp unit includes a receiving circuit for the sequential lighting prohibition signal, The receiving circuit includes: An input pin for receiving the sequential lighting prohibition signal; A variable resistor connected to the input pin; A resistor with a first end grounded; and A PNP-type transistor, which receives the steering synchronization signal at the emitter, has a base connected to the input pin, and a collector connected to the second end of the resistor.

4. The rear turn signal lamp according to any one of claims 1 to 3, characterized in that, The first lamp unit includes: A converter, which uses the steering synchronization signal as a power source and supplies a constant current to the plurality of first light-emitting elements connected in series; A plurality of bypass switches, which are connected in parallel with the plurality of first light-emitting elements; A converter, which uses the steering synchronization signal as a power source and supplies a constant current to the plurality of first light-emitting elements connected in series; and A lighting control circuit, which uses the steering synchronization signal as a power source and sequentially disconnects the plurality of bypass switches when the steering synchronization signal transitions to a high level, and simultaneously disconnects the plurality of bypass switches when the sequential lighting prohibition signal is valid.

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