Vehicle-mounted laser illumination blue light detection system and method

Abstract

The invention discloses a vehicle-mounted laser illumination blue light detection system and method. The method comprises the steps that laser is transmitted to a photosensitive sensor through a light taking device on a vehicle lamp reflector; the sensor converts the blue light component and the yellow light component in the light beam into corresponding current signals. And the MCU control circuit converts the current signal into a voltage signal by using an operational amplifier signal processing circuit, and performs judgment through a dual-threshold comparison logic: when the blue light voltage signal is greater than a preset threshold and the yellow light voltage signal is smaller than the preset threshold, it is judged that blue light leakage occurs. Once leakage is confirmed, the MCU activates all the laser emission units one by one, the signal acquisition and comparison process is repeated, the fault laser emission unit causing leakage is accurately positioned and marked, and finally isolation of the fault unit and safe operation of the system are achieved.

Description

Technical Field

[0001] This invention relates to the field of laser detection, specifically to a vehicle-mounted laser illumination blue light detection system and method. Background Technology

[0002] In the field of automotive lighting technology, in-vehicle laser lighting systems are becoming increasingly popular due to their high brightness and energy efficiency. However, blue light leakage may pose a potential threat to driving safety. Existing technologies commonly employ blue light detection by collecting echo signals. However, this method relies on fiber optic transmission, which has limited applicability and significant acquisition errors, making it difficult to meet the real-time reliability requirements of the automotive environment. Another approach relies on color temperature changes to determine if blue light levels exceed limits, but color temperature naturally decreases over time, leading to inaccurate detection thresholds and an inability to effectively identify blue light leakage risks, especially prone to misjudgments during long-term operation. These shortcomings render existing methods insufficient in terms of detection accuracy and fault tolerance, making them unsuitable for precise fault location in multi-laser source scenarios. Therefore, there is an urgent need for a technology that can monitor leakage in real time by comparing changes in blue and yellow light power and achieve intelligent isolation of faulty light sources to significantly improve detection accuracy and driving safety. Summary of the Invention

[0003] The purpose of this invention is to provide a vehicle-mounted laser lighting blue light detection system and method. This system and method can detect changes in the power of blue and yellow light, accurately determine whether blue light leakage has occurred based on these power changes, and then shut down the blue light source. When multiple laser sources are present, by individually shutting down one abnormal source, the usability of the laser emitter can be maximized while ensuring safety.

[0004] To achieve this objective, the present invention provides a vehicle-mounted laser illumination blue light detection system, comprising: Light-collecting device, photosensitive sensor, and MCU control circuit are installed on the headlight reflector; The light-collecting device mounted on the headlight reflector is used to transmit the laser emitted by the headlight laser emitter to the photosensitive sensor; The photosensitive sensor is used to convert the blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitting device into corresponding blue light current signal and yellow light current signal, respectively. The MCU control circuit uses an operational amplifier signal processing circuit to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. The MCU then compares these signals with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the MCU determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

[0005] Furthermore, the light-collecting device provided on the headlight reflector is to open a small hole at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light from the laser emitting device can be directly transmitted to the blue light photosensitive sensor and the yellow light photosensitive sensor, or to provide an optical surface at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light can be reflected to the blue light photosensitive sensor and the yellow light photosensitive sensor.

[0006] Furthermore, the method for determining whether a currently activated single laser emitting unit has experienced blue light leakage includes: comparing the blue light voltage signal and the yellow light voltage signal of the currently activated single laser emitting unit with the preset blue light voltage threshold and the preset yellow light voltage threshold, respectively; when the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, it is determined that the currently activated single laser emitting unit has experienced blue light leakage.

[0007] The photosensitive sensor includes a blue light photosensitive sensor and a yellow light photosensitive sensor. The blue light photosensitive sensor is used to convert the received blue light signal into a blue light current signal, and the yellow light photosensitive sensor is used to convert the received yellow light signal into a yellow light current signal.

[0008] Furthermore, the operational amplifier signal processing circuit includes a first operational amplifier and a second operational amplifier. The first operational amplifier is used to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signals and yellow light voltage signals, respectively, and perform primary amplification. The second operational amplifier is used to compare the primary amplified blue light voltage signals and yellow light voltage signals with preset blue light voltage thresholds and preset yellow light voltage thresholds, respectively, and output the logic level signal corresponding to the comparison result to the microcontroller unit (MCU).

[0009] Furthermore, the method for outputting the logic level signal corresponding to the comparison result to the microcontroller unit (MCU) includes: when the blue light voltage signal is greater than the preset blue light voltage threshold, the second operational amplifier outputs a low-level logic signal; otherwise, it outputs a high-level logic signal. When the yellow light voltage signal is less than the preset yellow light voltage threshold, the second operational amplifier outputs a low-level logic signal; otherwise, it outputs a high-level logic signal. When the microcontroller unit (MCU) receives two low-level logic signals simultaneously, it determines that blue light leakage has occurred in the laser emitting device.

[0010] Furthermore, when the microcontroller unit (MCU) determines that blue light leakage has occurred in the laser emitting device, it first shuts down the laser emitting device. Then, it activates all the laser emitting units in the laser emitting device one by one. When it determines that the currently activated single laser emitting unit is leaking blue light, the MCU marks the laser emitting unit as a faulty laser emitting unit and sends the identifier of the faulty laser emitting unit to the vehicle instrument panel for display via LIN or CAN communication. After the MCU activates all the laser emitting units and executes the blue light leakage detection process, it controls the faulty laser emitting unit to shut down and turns on the remaining non-faulty laser emitting units to continue performing the lighting work.

[0011] Furthermore, the blue light photosensitive sensor, the yellow light photosensitive sensor, the operational amplifier signal processing circuit, and the microcontroller unit (MCU) are integrated on a single PCB board. The PCB board is mounted on the side, rear, or edge of the reflector in a non-optical area using fasteners, so that the sensing surfaces of the blue light photosensitive sensor and the yellow light photosensitive sensor are aligned with the openings or optical surfaces on the reflector.

[0012] Furthermore, the preset blue light voltage threshold is the voltage value corresponding to the blue light photosensitive sensor calibrated when no blue light leakage occurs, and the preset yellow light voltage threshold is the voltage value corresponding to the yellow light photosensitive sensor calibrated when no blue light leakage occurs.

[0013] Furthermore, the small hole is a through hole obtained by drilling on the reflector, which is used to allow the laser emitted by the vehicle headlight laser emitting device to pass through the hole; the optical surface is an optical surface obtained by milling or molding the reflector surface, or by adding an independent micro reflector surface on the reflector as an optical surface, which is used to reflect the laser emitted by the vehicle headlight laser emitting device.

[0014] Furthermore, a method for detecting blue light from vehicle-mounted laser illumination based on the system includes: The laser emitted by the vehicle headlight laser emitter is transmitted to the photosensitive sensor through a light-collecting device installed on the headlight reflector. The blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitter are converted into corresponding blue light current signal and yellow light current signal, respectively, by a photosensitive sensor. The operational amplifier signal processing circuit converts the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. These signals are then compared with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the microcontroller unit (MCU) determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit then compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

[0015] The beneficial effects of this invention are as follows: Addressing the shortcomings of existing blue light detection technologies, such as large acquisition errors due to the use of optical fibers, unsuitability for automotive environments, and potential missed detections due to color temperature changes during prolonged use, this invention employs a detection method comparing the power changes of yellow and blue light. By creating holes or independent optical surfaces on the reflector, blue and yellow light photosensitive sensors can effectively receive a portion of the light and convert it into voltage signals Vb and Vy for real-time monitoring. During implementation, when the system detects that Vb exceeds the normal calibration value Vb0 and Vy is lower than the normal calibration value Vy0, the microcontroller unit (MCU) immediately determines that blue light leakage has occurred in the laser emitting device and controls all laser emitting units in the laser emitting device to shut down. Subsequently, by sequentially turning on each laser emitting unit and repeatedly comparing the voltage signals, the fault source is accurately located, and only the abnormal emitter is shut down, while the normal emitter continues to operate. It significantly improves the accuracy and reliability of blue light detection, avoids misjudgment problems caused by environmental changes or equipment aging, and greatly enhances the safety and practicality of the system through fault-tolerant strategies. It ensures that it can respond quickly and maintain some lighting functions in the event of blue light leakage, thereby effectively protecting the stability of vehicle laser lighting and driving safety. Attached Figure Description

[0016] Figure 1 This is a flowchart of the blue light detection process of the present invention; Figure 2 This is an illustration of the application of the photosensitive sensor of the present invention; Figure 3 The operational amplifier signal processing of this invention; Figure 4 This is a schematic diagram of the structure of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention. Wherein, 1—photosensitive sensor; 2—small hole set on reflector; 3—reflector; 4—vehicle light; 5—photodiode; 6—first operational amplifier; 7—inverting output mark; 8—second operational amplifier; 9—output transistor. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate active embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 5 As shown, a vehicle-mounted laser illumination blue light detection system includes: Light-collecting device, photosensitive sensor, and MCU control circuit are installed on the headlight reflector; The light-collecting device mounted on the headlight reflector is used to transmit the laser emitted by the headlight laser emitter to the photosensitive sensor; The photosensitive sensor is used to convert the blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitting device into corresponding blue light current signal and yellow light current signal, respectively. The MCU control circuit uses an operational amplifier signal processing circuit to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. The MCU then compares these signals with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the MCU determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

[0019] The photosensitive sensor includes a blue light photosensitive sensor and a yellow light photosensitive sensor. The blue light photosensitive sensor is used to convert the received blue light signal into a blue light current signal, and the yellow light photosensitive sensor is used to convert the received yellow light signal into a yellow light current signal.

[0020] like Figure 1 As shown, the blue light detection process is as follows: Beams emitted from multiple laser sources are first combined and focused by a prism. The converged high-energy blue laser then excites a phosphor material, completing a partial spectral conversion from blue to yellow light. The mixed beam of blue and yellow light (white light) is guided by a reflector to an external lens for optical shaping, ultimately projecting a bright light pattern that meets regulatory requirements to illuminate the road ahead. Simultaneously, a photosensitive sensor integrated into the optical path continuously samples the mixed beam of blue and yellow light at the reflector and transmits it to the controller (i.e., the MCU control circuit). The controller performs real-time power comparison and analysis of the optical signal. Once an abnormal spectral power is detected (indicating a potential risk of blue light leakage), the light source is quickly shut off to ensure safety. Then, each laser source is individually switched on and off to accurately locate the faulty component. Ultimately, not only is the faulty unit isolated to restore partial lighting function, but the fault information is also clearly displayed to the driver via the vehicle's instrument panel or central control screen.

[0021] like Figure 2 As shown in the diagram, the simplified application of the photosensitive sensor is as follows: The vehicle power supply is connected through the main connector (the connector that connects to the entire vehicle, used for power supply and signal transmission). The electrical energy first undergoes multiple protection and purification processes through the input pulse suppression circuit, the anti-reverse circuit, and the EMC filter circuit to form a stable DC power supply. This power supply is adjusted to the operating voltage required by the laser light source through the buck-boost circuit topology and then smoothly output through the energy storage filter circuit to provide precise energy supply to the laser light source. Another path generates a clean 5V voltage through the LDO conversion circuit to power the blue light photosensitive sensor, the yellow light photosensitive sensor, and the MCU control circuit. The light signals collected by the sensors in real time are transmitted to the MCU control circuit for analysis and processing. After comparing the processing results with the preset safety threshold, the MCU sends a command to the IC control circuit (the control circuit for the vehicle headlight laser emitter) through the "whether to turn off" logic decision module. The IC control circuit then implements real-time control of the buck-boost circuit topology and the laser light source according to the command, thereby achieving closed-loop monitoring and intelligent safety protection of the laser light source's operating status while completing efficient lighting drive.

[0022] In some technical solutions, the light-collecting device on the headlight reflector is to open a small hole at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light from the laser emitting device can be directly transmitted to the blue light photosensitive sensor and the yellow light photosensitive sensor; or an optical surface is provided at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light can be reflected to the blue light photosensitive sensor and the yellow light photosensitive sensor.

[0023] The threshold value has a completely different absolute light intensity value for different headlight models, different reflector surface designs, and different laser powers. It is a custom design parameter based on the optical performance of a specific product. It only needs to meet the requirement that the illuminance attenuation of the main spot after setting the aperture and optical surface should not exceed 1% or 2%.

[0024] Setting small holes or specific optical surfaces as light-collecting devices at the edge of the headlight reflector or in areas with weak light intensity can provide stable light samples for blue and yellow light photosensitive sensors without interfering with the illumination performance of the main light path. This ensures the accuracy and reliability of blue light leakage detection and effectively avoids detection failure or misjudgment caused by the sensor not receiving an effective signal.

[0025] In some technical solutions, the method for determining whether a currently activated single laser emitting unit has experienced blue light leakage includes: comparing the blue light voltage signal and the yellow light voltage signal of the currently activated single laser emitting unit with the preset blue light voltage threshold and the preset yellow light voltage threshold, respectively; when the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, it is determined that the currently activated single laser emitting unit has experienced blue light leakage.

[0026] The vehicle-mounted laser device does not directly emit white light. Instead, it uses a high-energy blue laser beam to irradiate phosphor. Upon excitation, a portion of the blue light is absorbed and converted into lower-energy, broader-spectrum yellow light. The remaining blue light mixes with the newly generated yellow light, ultimately forming the bright white light visible to the human eye. Under normal conditions, the energy ratio of blue to yellow light is maintained within a pre-designed and calibrated stable range. The blue light voltage signal (Vb) and yellow light voltage signal (Vy) from the photosensitive sensor are also stabilized at their respective reference values ​​(preset blue light voltage threshold Vb0, preset yellow light voltage threshold Vy0). When the laser emitting unit malfunctions (e.g., phosphor aging), the phosphor's conversion efficiency decreases or fails, weakening its ability to absorb blue light and generate yellow light. This results in a relative increase in the blue light component: because the portion of blue light that should have been absorbed and converted is not effectively processed and leaks out, causing an abnormally high blue light power in the emitted light; and a decrease in the yellow light component: due to the reduced excitation efficiency of the phosphor, the total amount of yellow light generated also decreases. Therefore, when the voltage returned by the blue light sensor is high, while the voltage returned by the yellow light sensor decreases (i.e., the blue light voltage signal is greater than the preset blue light voltage threshold while the yellow light voltage signal is less than the preset yellow light voltage threshold), it indicates that blue light leakage has occurred in the laser emitter. When both the blue light voltage signal and the yellow light voltage signal are equal to the preset blue light voltage threshold, it indicates that no blue light leakage has occurred in the laser emitter.

[0027] By comparing the blue light voltage signal and yellow light voltage signal of the currently activated single laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold respectively, it is possible to accurately and quickly identify the blue light leakage of a single laser emitting unit, which facilitates timely location of the fault source.

[0028] In some technical solutions, the operational amplifier signal processing circuit includes a first operational amplifier and a second operational amplifier. The first operational amplifier is used to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signals and yellow light voltage signals, respectively, and perform primary amplification. The second operational amplifier is used to compare the primary amplified blue light voltage signals and yellow light voltage signals with preset blue light voltage thresholds and preset yellow light voltage thresholds, respectively, and output the logic level signal corresponding to the comparison result to the microcontroller unit (MCU).

[0029] The first operational amplifier efficiently converts the blue and yellow light current signals into voltage signals and amplifies them in the primary stage. Then, the second operational amplifier accurately compares the amplified voltage signal with a preset threshold and outputs a logic level signal to the microcontroller unit (MCU). This enables high-precision signal conditioning and digital conversion, thereby significantly improving the response speed, anti-interference ability, and reliability of blue light leakage detection.

[0030] In some embodiments, there are two operational amplifier signal processing circuits, one for processing yellow light signals and one for processing blue light signals. Each operational amplifier signal processing circuit includes a first operational amplifier and a second operational amplifier, as shown in the figure. Figure 3 As shown: The incident light Ee is first converted into a weak current signal by the photodiode 5. This current is then input to the inverting input of the first operational amplifier 6. With the reference voltage Vref connected to its non-inverting input, the first operational amplifier 6 converts this current signal into a primary voltage signal and amplifies it using a transimpedance amplifier configuration. The amplified voltage signal is then sent to the inverting input of the second operational amplifier 8, while the non-inverting input of the second operational amplifier 8 is grounded, making it work as a voltage comparator. It compares the input voltage with zero potential (a preset blue light voltage threshold or a preset yellow light voltage threshold), and its output directly drives the output transistor 9 of the subsequent stage. Finally, the switching state of the transistor forms a high-level or low-level digital logic signal at the output terminal O2-OUT. 3-Vdd is the positive power supply voltage input terminal, 1-Vss is the negative power supply voltage or reference ground terminal, and the inverting output mark 7 indicates that the signal output from the 2-OUT pin is logically opposite to the voltage signal received by the inverting input terminal of the second operational amplifier. The inverting output provides signal isolation and anti-interference capability, avoiding the risk of positive feedback oscillation that may be caused by the output signal being in phase with the input signal.

[0031] In some technical solutions, the method of outputting the logic level signal corresponding to the comparison result to the microcontroller unit (MCU) includes: when the blue light voltage signal is greater than the preset blue light voltage threshold, the second operational amplifier outputs a low-level logic signal, otherwise it outputs a high-level logic signal; when the yellow light voltage signal is less than the preset yellow light voltage threshold, the second operational amplifier outputs a low-level logic signal, otherwise it outputs a high-level logic signal; when the microcontroller unit (MCU) receives two low-level logic signals at the same time, it determines that blue light leakage has occurred in the laser emitting device.

[0032] By comparing the blue light voltage signal with a preset threshold and the yellow light voltage signal with a preset threshold as two independent logic signals, the system outputs them to the microcontroller unit (MCU). Blue light leakage is only determined when the MCU receives both high-level logic signals simultaneously. This digital logic and judgment based on the hardware comparison results improves the accuracy and reliability of blue light leakage status judgment and avoids false triggering caused by fluctuations in a single signal.

[0033] In some technical solutions, when the microcontroller unit (MCU) determines that the laser emitter is leaking blue light, it first shuts down the laser emitter. Then, it activates all the laser emitting units in the laser emitter one by one. When it determines that the currently activated single laser emitting unit is leaking blue light, the MCU marks the laser emitting unit as a faulty laser emitting unit and sends the identifier of the faulty laser emitting unit to the vehicle instrument panel for display via LIN or CAN communication. After the MCU activates all the laser emitting units and performs the blue light leakage detection process, it controls the faulty laser emitting unit to shut down and turns on the remaining non-faulty laser emitting units to continue performing the lighting work.

[0034] Through multi-stage collaborative control, including global emergency shutdown, sequential polling detection, precise faulty laser emitting unit marking, real-time fault reporting, and local fault isolation and system recovery, the system maintains lighting functionality to the maximum extent while ensuring safety. This provides an instantaneous safety response mechanism and significantly improves system reliability and user experience through intelligent diagnostics and fault-tolerant design.

[0035] In some technical solutions, the blue light photosensitive sensor, the yellow light photosensitive sensor, the operational amplifier signal processing circuit and the microcontroller unit (MCU) are integrated on a single PCB board. The PCB board is mounted on the side, rear or edge of the reflector in a non-optical area using fasteners, so that the sensing surfaces of the blue light photosensitive sensor and the yellow light photosensitive sensor are aligned with the openings or optical surfaces on the reflector.

[0036] The blue light photosensitive sensor, yellow light photosensitive sensor, operational amplifier signal processing circuit and microcontroller (MCU) are highly integrated on a single PCB board. They are precisely mounted on the non-optical area of ​​the reflector using fasteners, and the sensor surface is aligned with the opening or optical surface. This achieves an integrated and modular layout of the detection element and processing unit, effectively shortening the signal transmission path, reducing external interference, and ensuring the accuracy and stability of optical sampling.

[0037] In some embodiments, such as Figure 4 As shown, the photosensitive sensor 1 (blue light photosensitive sensor, yellow light photosensitive sensor) is positioned aligned with the small hole 2, and the light from the reflector 3 is transmitted to the headlight 4 for illumination.

[0038] In some technical solutions, the preset blue light voltage threshold is the voltage value of the blue light photosensitive sensor calibrated when no blue light leakage occurs, and the preset yellow light voltage threshold is the voltage value of the yellow light photosensitive sensor calibrated when no blue light leakage occurs.

[0039] The preset blue light voltage threshold and preset yellow light voltage threshold are set to the voltage values ​​obtained by actual measurement (average of multiple measurements) of the vehicle headlight laser emitting device under normal operating conditions without blue light leakage. This transforms the blue light leakage judgment into the monitoring of the deviation of the real-time signal from its own health benchmark, effectively eliminating measurement errors caused by individual differences in components, initial installation conditions, and slow drift over time.

[0040] In some technical solutions, the small hole is a through hole obtained by drilling on the reflector, which is used to allow the laser emitted by the vehicle headlight laser emitting device to pass through the hole; the optical surface is an optical surface obtained by milling or molding the reflector surface, or by adding an independent micro reflector surface on the reflector as an optical surface, which is used to reflect the laser emitted by the vehicle headlight laser emitting device.

[0041] The small hole and optical surface provide a stable and reliable optical sampling channel for the photosensitive sensor, ensuring the independence and accuracy of the detection optical path and the main illumination optical path. The standardized processing technology also ensures the consistency of component precision and mass production. This achieves effective optical coupling while minimizing interference with the main light field distribution, providing a stable and accurate signal source for the entire blue light leakage detection system.

[0042] In some embodiments, the drilling process includes laser processing, micro-electrical discharge machining, and precision mechanical drilling, etc. The milling process includes directly machining the optical surface on the pre-formed reflector substrate by turning or milling the surface on an ultra-precision machine tool. The mold forming process includes using ultra-precision CNC milling or single-point diamond turning technology to process an integrated cavity containing a main parabolic surface and a micro optical surface on the mold steel. The optical surface is obtained by attaching an independent micro reflector surface on the reflector, which includes first processing an independent micro optical prism or reflector, and then fixing it to a specific position on the reflector substrate by high-precision positioning and bonding technology.

[0043] Example 2 A method for detecting blue light from vehicle-mounted laser illumination based on the system, comprising: The laser emitted by the vehicle headlight laser emitter is transmitted to the photosensitive sensor through a light-collecting device installed on the headlight reflector. The blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitter are converted into corresponding blue light current signal and yellow light current signal, respectively, by a photosensitive sensor. The operational amplifier signal processing circuit converts the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. These signals are then compared with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the microcontroller unit (MCU) determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit then compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

[0044] Example 3 The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method described in Embodiment 2.

[0045] This invention can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented in whole or in part as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0046] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

[0047] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A vehicle-mounted laser illumination blue light detection system, characterized in that, It includes: Light-collecting device, photosensitive sensor, and MCU control circuit are installed on the headlight reflector; The light-collecting device mounted on the headlight reflector is used to transmit the laser emitted by the headlight laser emitter to the photosensitive sensor; The photosensitive sensor is used to convert the blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitting device into corresponding blue light current signal and yellow light current signal, respectively. The MCU control circuit uses an operational amplifier signal processing circuit to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. The MCU then compares these signals with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the MCU determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

2. The vehicle-mounted laser illumination blue light detection system according to claim 1, characterized in that: The light-collecting device on the headlight reflector is to open a small hole at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light from the laser emitting device can be directly transmitted to the blue light photosensitive sensor and the yellow light photosensitive sensor; or to set an optical surface at the edge of the reflector or in an area where the light intensity is less than a threshold, so that the light can be reflected to the blue light photosensitive sensor and the yellow light photosensitive sensor.

3. The vehicle-mounted laser illumination blue light detection system according to claim 1, characterized in that: The method for determining whether a currently activated single laser emitting unit has experienced blue light leakage includes: comparing the blue light voltage signal and the yellow light voltage signal of the currently activated single laser emitting unit with the preset blue light voltage threshold and the preset yellow light voltage threshold, respectively; when the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, it is determined that the currently activated single laser emitting unit has experienced blue light leakage.

4. A vehicle-mounted laser illumination blue light detection system according to claim 1 or 3, characterized in that: The operational amplifier signal processing circuit includes a first operational amplifier and a second operational amplifier. The first operational amplifier is used to convert the blue light current signal and the yellow light current signal into corresponding blue light voltage signals and yellow light voltage signals, respectively, and perform primary amplification. The second operational amplifier is used to compare the primary amplified blue light voltage signals and yellow light voltage signals with preset blue light voltage thresholds and preset yellow light voltage thresholds, respectively, and output the logic level signal corresponding to the comparison result to the microcontroller unit (MCU).

5. The vehicle-mounted laser illumination blue light detection system according to claim 4, characterized in that: The method for outputting the logic level signal corresponding to the comparison result to the microcontroller unit (MCU) includes: when the blue light voltage signal is greater than the preset blue light voltage threshold, the second operational amplifier outputs a low-level logic signal; otherwise, it outputs a high-level logic signal. When the yellow light voltage signal is less than the preset yellow light voltage threshold, the second operational amplifier outputs a low-level logic signal; otherwise, it outputs a high-level logic signal. When the microcontroller unit (MCU) receives two low-level logic signals at the same time, it determines that blue light leakage has occurred in the laser emitting device.

6. A vehicle-mounted laser illumination blue light detection system according to claim 1, 3, or 5, characterized in that: When the microcontroller unit (MCU) determines that the laser emitter is leaking blue light, it first shuts down the laser emitter. Then, it activates all the laser emitting units in the laser emitter one by one. When it determines that the currently activated single laser emitting unit is leaking blue light, the MCU marks that laser emitting unit as a faulty laser emitting unit and sends the identifier of the faulty laser emitting unit to the vehicle instrument panel for display via LIN or CAN communication. After the MCU activates all the laser emitting units and performs the blue light leakage detection process, it controls the faulty laser emitting unit to shut down and turns on the remaining non-faulty laser emitting units to continue performing the lighting work.

7. The vehicle-mounted laser illumination blue light detection system according to claim 4, characterized in that: A blue light photosensitive sensor, a yellow light photosensitive sensor, an operational amplifier signal processing circuit, and a microcontroller unit (MCU) are integrated on a single PCB board. The PCB board is mounted on the side, rear, or edge of the reflector in a non-optical area using fasteners, so that the sensing surfaces of the blue light photosensitive sensor and the yellow light photosensitive sensor are aligned with the openings or optical surfaces on the reflector.

8. The vehicle-mounted laser illumination blue light detection system according to claim 1, characterized in that: The preset blue light voltage threshold is the voltage value corresponding to the blue light photosensitive sensor calibrated when no blue light leakage occurs, and the preset yellow light voltage threshold is the voltage value corresponding to the yellow light photosensitive sensor calibrated when no blue light leakage occurs.

9. The vehicle-mounted laser illumination blue light detection system according to claim 2, characterized in that: The small hole is a through hole obtained by drilling on the reflector, which is used to allow the laser emitted by the vehicle headlight laser emitting device to pass through the hole; the optical surface is an optical surface obtained by milling or molding the reflector surface, or by adding an independent micro-reflective mirror on the reflector as an optical surface, which is used to reflect the laser emitted by the vehicle headlight laser emitting device.

10. A method for detecting blue light from vehicle-mounted laser illumination based on the system of claim 1, characterized in that, include: The laser emitted by the vehicle headlight laser emitter is transmitted to the photosensitive sensor through a light-collecting device installed on the headlight reflector. The blue light signal and yellow light signal in the laser emitted by the vehicle headlight laser emitting device are converted into corresponding blue light current signal and yellow light current signal respectively by a photosensitive sensor. The operational amplifier signal processing circuit converts the blue light current signal and the yellow light current signal into corresponding blue light voltage signal and yellow light voltage signal, respectively. These signals are then compared with preset blue light voltage thresholds and preset yellow light voltage thresholds. When the blue light voltage signal is greater than the preset blue light voltage threshold and the yellow light voltage signal is less than the preset yellow light voltage threshold, the microcontroller unit (MCU) determines that blue light leakage has occurred in the laser emitting device. Upon determining that blue light leakage has occurred, the MCU activates all laser emitting units in the laser emitting device one by one. The operational amplifier signal processing circuit then compares the blue light voltage signal and yellow light voltage signal of each currently activated individual laser emitting unit with the preset blue light voltage threshold and preset yellow light voltage threshold, respectively, to determine whether the currently activated individual laser emitting unit has experienced blue light leakage. If blue light leakage has occurred in the currently activated individual laser emitting unit, that laser emitting unit is marked as a faulty laser emitting unit.

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