A dynamic coil and flat panel combined headphone welding device and method based on high-temperature shielding

Abstract

The present invention relates to a welding device and method for a moving coil and planar combination headphone based on high-temperature shielding, which achieves precise welding alignment through temperature detection. The device monitors the temperature distribution in the welding area through the light-transmitting holes on the mask plate and temperature sensors to ensure the precise alignment of the welding points. The data of the temperature sensors is fed back to the control unit to dynamically adjust the moving speed and power of the laser source to adapt to the temperature changes during the welding process and ensure the welding quality. The temperature feedback mechanism not only improves the welding accuracy but also increases the yield rate, avoiding material thermal damage and welding defects, which is crucial for improving the acoustic performance and durability of the headphones. The welding device of the present invention provides an innovative solution for the manufacture of moving coil and planar combination headphones with its high precision, high efficiency and cost-effectiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and particularly relates to a welding device and method for a moving coil and planar magnetic hybrid headphone based on high-temperature shielding. Background Art

[0002] In the design and manufacture of moving coil and planar magnetic hybrid headphones, as Figure 2 shown, the welding precision of the planar diaphragm is crucial because it directly affects the sound field matching between the planar speaker and the moving coil speaker and the final sound quality performance. As a precision audio component, the welding quality of the planar diaphragm is directly related to the acoustic performance and durability of the headphone. In the existing technology, pulsed laser welding is often used for welding such components. After the laser is aligned with the welding position, the laser is started for welding. However, as Figure 1 shown, the energy change of pulsed laser has a rising edge and a falling edge. Due to the instability of its power, pulsed laser welding often cannot ensure precise control during the welding process. This instability may lead to welding defects, affecting the structural integrity and acoustic characteristics of the diaphragm. In addition, since the long-term stability of the output power of pulsed lasers is generally not as good as that of continuous lasers, this means that more frequent adjustment and monitoring are required during the welding process, increasing the complexity and cost of operation.

[0003] Based on this, it is necessary to design a welding device and method for a moving coil and planar magnetic hybrid headphone that can use continuously output stable laser for welding. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a welding device for a moving coil and planar magnetic hybrid headphone based on high-temperature shielding, including:

[0005] A welding laser source for emitting infrared continuous laser, and the laser passes through the light-transmitting hole and performs laser welding on the welding point of the diaphragm;

[0006] A mask plate for providing high-temperature shielding to the diaphragm to be welded, and a light-transmitting hole is provided at the position corresponding to the welding point on the mask plate;

[0007] The mask plate is provided with a temperature sensor, and the temperature sensor is arranged at the position where the bottom of the light-transmitting hole of the mask plate contacts the diaphragm, for detecting the temperature around the welding area;

[0008] A control unit, connected to the temperature sensor, and controlling the moving speed of the welding laser source according to the detected temperature.

[0009] The mask plate includes a shielding area and a light-transmitting hole arranged on the shielding area, and an annular detection area is arranged around the light-transmitting hole;

[0010] The shielding area is made of high-temperature resistant reflective material, and the annular detection area is made of multiple layers of materials, including a light attenuation layer, a light energy sensor layer, a heat insulation layer arranged at the top in sequence, and a temperature sensor layer arranged at the bottom;

[0011] The light attenuation layer is used to attenuate the light energy irradiated onto the light energy sensor; the heat insulation layer is used to isolate the heat conduction between the light energy sensor and the temperature sensor, and the temperature sensor is arranged at the bottom to contact the diaphragm to be welded.

[0012] The shape of the mask is the same as the outer frame of the diaphragm of the flat horn to be welded, and light-transmitting holes are opened at the edge of the mask.

[0013] The control unit is connected to the displacement control module, the welding laser source and the mask; the welding laser source is provided with an energy controller and a fiber optic coupler, the fiber optic coupler is provided with a coupling adjustment unit, and the coupling adjustment unit can adjust the distribution ratio of the optical power output from the welding laser source to the welding laser head, and the energy controller is used to adjust the fiber optic coupler to achieve the adjustment of the distribution ratio of the optical power output from the welding laser source to the welding laser head;

[0014] The mask includes an annular detection area, and a light energy sensor and a temperature sensor are arranged in the annular detection area. The light energy sensor detects the laser energy irradiated by the laser source near the light-transmitting hole, and the temperature sensor detects the temperature of the diaphragm near the light-transmitting hole;

[0015] The displacement control module is connected to the laser displacement module and the mask displacement module; the laser displacement module is provided with X-axis and Y-axis driving mechanisms for driving the laser head to move in the horizontal direction; the mask displacement module is used to adjust the positions of the mask and the diaphragm to ensure the alignment of the mask, the diaphragm and the diaphragm frame.

[0016] The diameter range of the circular light spot formed by the laser emitted by the welding laser source is 1.1 times to 1.9 times the diameter of the light-transmitting hole; the annular detection area includes multiple temperature measurement points, and the measurement points are evenly distributed around the light-transmitting hole for measuring the temperature distribution in the area near the light-transmitting hole; during measurement, the coupling adjustment unit can adjust the optical power output from the welding laser source to the welding laser head to be lower than the welding power; the control unit receives the measurement data of the temperature sensor and calculates the deviation between the temperature value of each measurement point and the average temperature value; the control unit further calculates the standard deviation σ of the temperature deviation to quantify the uniformity of the temperature distribution;

[0017] The control unit judges the alignment of the light-transmitting hole of the mask and the welding point of the diaphragm according to the standard deviation σ. When σ is less than the preset threshold, it indicates that the temperature distribution is uniform and the mask is aligned with the diaphragm; when σ is greater than or equal to the preset threshold, the control unit sends an adjustment signal to the displacement control module to adjust the position of the mask until the temperature distribution is uniform.

[0018] The control unit further includes a heating rate calculation module for calculating the heating rate detected by the temperature sensor during the welding process; the control unit adjusts the moving speed of the welding laser source according to the heating rate obtained by the heating rate calculation module, specifically:

[0019] When the heating rate exceeds a preset threshold, it indicates that the temperature of the welding area rises too fast. The control unit increases the moving speed of the laser to reduce the irradiation time of the laser on the light-transmitting hole and prevent the welding area from overheating; when the heating rate is lower than the preset threshold, it indicates that the temperature of the welding area rises appropriately. The control unit will maintain or appropriately adjust the moving speed of the laser to ensure the welding quality; the control unit monitors the temperature data of the temperature sensor in real time through a closed-loop control method and dynamically adjusts the moving speed of the laser to achieve precise temperature control;

[0020] The control unit is provided with a PID adjustment function. Through the proportional, integral and differential control algorithms, according to the change trend of the heating rate, it finely adjusts the moving speed of the laser to maintain the temperature stability during the welding process; the control unit stores a temperature-speed mapping table, which is preset according to historical data and experimental results and is used to directly map the heating rate to the corresponding moving speed of the laser to achieve fast response and precise control;

[0021] The calculation formula for the heating rate is: heating rate = ΔT / Δt; ΔT is the temperature change detected by the temperature sensor within the time interval Δt;

[0022] When setting the temperature-speed mapping table, the calculation formula for adjusting the moving speed of the laser according to the heating rate is:

[0023] ;

[0024] where, V is the adjusted moving speed of the laser, V0 is the initial moving speed of the laser, K p 、K i and K d are the proportional, integral and differential coefficients of the PID control respectively, and T ref is the preset reference value of the heating rate;

[0025] The control unit accurately calculates the adjusted moving speed of the laser according to the heating rate to ensure that the temperature during the welding process is controlled within the ideal range.

[0026] The shielding area is made of a high-temperature resistant and reflective material, which is a multi-layer composite structure, specifically including:

[0027] The outer layer is a metal coating with high reflectivity, such as a vacuum coating of aluminum or silver, which is used to reflect the infrared light emitted by the laser light source. The middle layer is a ceramic fiber material with high temperature resistance, using alumina fiber or carbon fiber, which is used to provide heat insulation and fire resistance performance. The inner layer is a flexible substrate with high temperature resistance, using silicone rubber or fluororubber, which ensures the flexibility and durability of the material in a high temperature environment.

[0028] The outer surface of the shielding area is coated with a high temperature resistant reflective coating, which can work stably in a high temperature environment not lower than 300 °C, and maintain its physical properties and reflection properties without significant degradation.

[0029] The light energy sensor is used to monitor the optical power stability of the laser in real time during the welding process, ensuring that the laser power around the light transmission hole meets the welding process requirements. The light energy sensor can detect the light energy emitted by the laser source and convert it into an electrical signal, which is then sent to the control unit for analysis and processing.

[0030] The control unit adjusts the energy controller according to the feedback data of the light energy sensor to adjust the laser output power.

[0031] The energy controller divides the laser into two beams by adjusting the optical path distribution ratio in the fiber optic coupler: one beam is directly transmitted to the laser head for welding, and the other beam is input into the light absorption trap. By changing the proportion of the laser energy input into the light absorption trap, the energy controller can finely adjust the laser power reaching the laser head, thereby achieving precise control of the laser power during the welding process.

[0032] A method of welding according to the dynamic coil flat panel combined headphone welding device based on high temperature shielding includes the following steps:

[0033] Step 1: Start the welding device to emit infrared continuous laser from the welding laser source, and at the same time, initialize the control unit to prepare to receive signals from the light energy sensor and the temperature sensor.

[0034] Step 2: Position the mask plate above the diaphragm to be welded, ensure that the light transmission hole of the mask plate is aligned with the welding point of the diaphragm, and adjust the position of the mask plate through the displacement control module to ensure precise alignment.

[0035] Step 3: The light energy sensor monitors the optical power of the laser source and feeds the data back to the control unit. The control unit adjusts the fiber optic coupler through the energy controller according to the feedback data to ensure that the laser power is stable and meets the welding requirements.

[0036] Step 4: The welding laser source starts to work at the measured power, irradiates the diaphragm through the light transmission hole, and at the same time, the temperature sensor measures the temperature distribution around the light transmission hole. The control unit calculates the standard deviation of the temperature deviation to determine whether the mask plate is aligned with the diaphragm.

[0037] Step Five: Once it is confirmed that the mask and the diaphragm are aligned, the welding laser source switches to the welding power, and the actual welding process begins. At the same time, the control unit dynamically adjusts the moving speed of the laser according to the temperature rising rate detected by the temperature sensor to keep the temperature of the welding area stable;

[0038] Step Six: After welding is completed, the device enters the cooling and self-check state, and the control unit monitors the temperature of the welding area to ensure that the temperature drops to a safe level;

[0039] Step Seven: After the device completes self-check and confirms that the welding quality meets the standards, the welding laser source is turned off, the entire welding process is completed, and the device is ready for the next welding operation.

[0040] The beneficial effects of the present invention are as follows:

[0041] The continuous laser welding technology provides a stable heat source, which is suitable for welding thicker materials or long-distance welding tasks. It can achieve high-speed welding and improve production efficiency. During continuous welding, the temperature distribution is more uniform, which is beneficial to improving the quality of the welded joint.

[0042] The welding mode of the light-transmitting hole realizes precise welding of the diaphragm through precise beam positioning, avoiding damage to non-welded parts. Due to the positioning effect of the light-transmitting hole on the laser beam, the accuracy requirement for the moving position of the laser head by the actuator is reduced, and it is not necessary to adjust the shape of the laser spot during laser welding. This mode can achieve welding in a narrow space of the welding part and improve the welding efficiency.

[0043] By real-time monitoring the temperature data of the temperature sensor, the control unit can dynamically adjust the moving speed of the laser to keep the temperature of the welding area stable. This closed-loop control method improves the stability of the welding process and the welding quality. The PID adjustment function finely adjusts the moving speed of the laser according to the change trend of the temperature rising rate through proportional, integral, and differential control algorithms to keep the temperature stable during the welding process.

[0044] By accurately measuring the uniformity of the temperature distribution around the welding area, it is possible to ensure the precise alignment of the light-transmitting hole of the mask and the welding point of the diaphragm. This temperature feedback mechanism allows the control unit to dynamically adjust the moving speed and power of the welding laser source to adapt to the temperature changes during the welding process, thereby improving the welding accuracy and the finished product rate. In addition, the temperature detection system can real-time monitor the temperature of the welding area, timely detect and correct any alignment deviation, ensure the uniform distribution of heat energy during the welding process, avoid thermal damage to the material and welding defects, and thus improve the quality and consistency of the welded joint. This high-precision temperature control and alignment positioning detection are crucial for realizing the precise welding of the planar diaphragm in the moving coil planar combined earphone, directly affecting the acoustic performance and durability of the earphone. Description of the Drawings

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0046] Attached Figure 1 is the power-time curve of the pulsed laser in the prior art;

[0047] Attached Figure 2 is the structural diagram of the moving coil and planar combination earphone;

[0048] Attached Figure 3 is the structural diagram of the planar diaphragm of the moving coil and planar combination earphone;

[0049] Attached Figure 4 is the structural schematic diagram of the diaphragm and the mask plate;

[0050] Attached Figure 5 is the schematic diagram of the principle during welding;

[0051] Attached Figure 6 is the schematic diagram of the position of the light-transmitting hole of the mask plate;

[0052] Attached Figure 7 is the schematic diagram of the architecture of the welding device of the present invention.

[0053] Among them, the housing 1, the moving coil speaker 2, the interface 3, the planar speaker 4, the planar speaker gasket 5, the ear tip 6, the head beam assembly 7, the planar diaphragm 41, the diaphragm frame 42, the welding point 43, the light-transmitting hole 44, the mask plate 45, the detection area 451, and the shielding area 452. Specific Embodiments

[0054] Embodiment 1:

[0055] Refer to Figures 1 to 7 , the present invention provides a moving coil and planar combination earphone welding device based on high-temperature shielding, including:

[0056] A welding laser source for emitting infrared continuous laser, and the laser passes through the light-transmitting hole and performs laser welding on the welding point of the diaphragm;

[0057] A mask plate for providing high-temperature shielding to the diaphragm to be welded, and a light-transmitting hole is opened at the position corresponding to the welding point on the mask plate;

[0058] The mask plate is provided with a temperature sensor, and the temperature sensor is arranged at the position where the bottom of the light-transmitting hole of the mask plate contacts the diaphragm, for detecting the temperature around the welding area;

[0059] A control unit, connected to the temperature sensor, controls the moving speed of the welding laser source according to the detected temperature.

[0060] The mask includes a shielding area and a light-transmitting hole provided on the shielding area, and an annular detection area is provided around the light-transmitting hole;

[0061] The shielding area is made of a high-temperature resistant and reflective material, and the annular detection area is made of multiple layers of materials, including a light attenuation layer, a light energy sensor layer, a heat insulation layer arranged in sequence on the top, and a temperature sensor layer arranged at the bottom;

[0062] The light attenuation layer is used to attenuate the light energy irradiated on the light energy sensor; the heat insulation layer is used to isolate the heat conduction between the light energy sensor and the temperature sensor, and the temperature sensor is arranged at the bottom and contacts the diaphragm to be welded.

[0063] The shape of the mask is the same as the outer frame of the diaphragm of the flat horn to be welded, and a light-transmitting hole is opened at the edge of the mask.

[0064] The control unit is connected to a displacement control module, a welding laser source and a mask; the welding laser source is provided with an energy controller and a fiber optic coupler, the fiber optic coupler is provided with a coupling adjustment unit, and the coupling adjustment unit can adjust the distribution ratio of the optical power output from the welding laser source to the welding laser head, and the energy controller is used to adjust the fiber optic coupler to achieve the adjustment of the distribution ratio of the optical power output from the welding laser source to the welding laser head;

[0065] The mask includes an annular detection area, a light energy sensor and a temperature sensor are arranged in the annular detection area, the light energy sensor detects the laser energy irradiated by the laser source near the light-transmitting hole, and the temperature sensor detects the temperature of the diaphragm near the light-transmitting hole;

[0066] The displacement control module is connected to a laser displacement module and a mask displacement module; the laser displacement module is provided with X-axis and Y-axis drive mechanisms for driving the laser head to move in the horizontal direction; the mask displacement module is used to adjust the positions of the mask and the diaphragm to ensure the alignment of the mask, the diaphragm and the diaphragm frame.

[0067] The diameter of the circular light spot formed by the laser emitted by the welding laser source ranges from 1.1 times to 1.9 times the diameter of the light-transmitting hole; the annular detection area includes multiple temperature measurement points, and the measurement points are evenly distributed around the light-transmitting hole for measuring the temperature distribution in the area near the light-transmitting hole; during measurement, the coupling adjustment unit adjusts the optical power output from the welding laser source to the welding laser head to be lower than the welding power of the material; the control unit receives the measurement data of the temperature sensor, calculates the deviation between the temperature value of each measurement point and the average temperature value; the control unit further calculates the standard deviation σ of the temperature deviation to quantify the uniformity of the temperature distribution;

[0068] The control unit determines the alignment between the light-transmitting holes of the mask and the welding points of the diaphragm according to the standard deviation σ. When σ is less than the preset threshold, it indicates that the temperature distribution is uniform and the mask is aligned with the diaphragm. When σ is greater than or equal to the preset threshold, the control unit sends an adjustment signal to the displacement control module to adjust the position of the mask until the temperature distribution is uniform.

[0069] The control unit further includes a heating rate calculation module for calculating the heating rate of the temperature detected by the temperature sensor during the welding process. The control unit adjusts the moving speed of the welding laser source according to the heating rate obtained by the heating rate calculation module, specifically:

[0070] When the heating rate exceeds the preset threshold, it indicates that the temperature of the welding area rises too fast. The control unit increases the moving speed of the laser to reduce the irradiation time of the laser on the light-transmitting holes and prevent the welding area from overheating. When the heating rate is lower than the preset threshold, it indicates that the temperature of the welding area rises appropriately. The control unit will maintain or appropriately adjust the moving speed of the laser to ensure the welding quality. The control unit uses a closed-loop control method to monitor the temperature data of the temperature sensor in real time and dynamically adjusts the moving speed of the laser to achieve precise temperature control.

[0071] The control unit is provided with a PID adjustment function. Through proportional, integral, and derivative control algorithms, according to the change trend of the heating rate, it finely adjusts the moving speed of the laser to maintain the temperature stability during the welding process. The control unit stores a temperature-speed mapping table, which is preset according to historical data and experimental results and is used to directly map the heating rate to the corresponding moving speed of the laser to achieve fast response and precise control.

[0072] The calculation formula for the heating rate is: heating rate = ΔT / Δt; ΔT is the temperature change detected by the temperature sensor within the time interval Δt.

[0073] When setting the temperature-speed mapping table, the calculation formula for adjusting the moving speed of the laser according to the heating rate is:

[0074] ;

[0075] where V is the adjusted moving speed of the laser, V0 is the initial moving speed of the laser, K p 、K i and K d are the proportional, integral, and derivative coefficients of the PID control respectively, and T ref is the preset reference value of the heating rate.

[0076] The control unit accurately calculates the moving speed of the laser adjusted according to the heating rate to ensure that the temperature during the welding process is controlled within the ideal range.

[0077] The shielding area is made of a high-temperature resistant and reflective material, which is a multi-layer composite structure and specifically includes:

[0078] The outer layer is a metal coating with a high reflectivity, such as a vacuum coating of aluminum or silver, which is used to reflect the infrared light emitted by the laser light source. The middle layer is a high-temperature resistant ceramic fiber material, using alumina fiber or carbon fiber, which is used to provide heat insulation and fire resistance performance. The inner layer is a high-temperature resistant flexible substrate, using silicone rubber or fluororubber, which ensures the flexibility and durability of the material in a high-temperature environment.

[0079] The outer surface of the shielding area is coated with a high-temperature resistant and reflective coating, which can work stably in a high-temperature environment not lower than 300°C, and maintain its physical properties and reflection properties without significant degradation.

[0080] The optical energy sensor is used to monitor the optical power stability of the laser in real time during the welding process, ensuring that the laser power around the light-transmitting hole meets the welding process requirements. The optical energy sensor can detect the optical energy emitted by the laser source and convert it into an electrical signal, which is then sent to the control unit for analysis and processing.

[0081] The control unit adjusts the energy controller according to the feedback data of the optical energy sensor to adjust the laser output power.

[0082] The energy controller divides the laser into two beams by adjusting the optical path distribution ratio in the fiber optic coupler: one beam is directly transmitted to the laser head for welding, and the other beam is input into the optical absorption trap. By changing the proportion of the laser energy input into the optical absorption trap, the energy controller can finely adjust the laser power reaching the laser head, thereby achieving precise control of the laser power during the welding process.

[0083] Embodiment 2:

[0084] A welding method according to the dynamic coil flat panel combined headphone welding device based on high-temperature shielding includes the following steps:

[0085] Step 1: Start the welding device, enable the welding laser source to emit infrared continuous laser, and at the same time, initialize the control unit to prepare to receive signals from the optical energy sensor and the temperature sensor;

[0086] In this process, the welding laser source is activated and starts to emit infrared continuous laser. At the same time, the control unit performs self-check to ensure that all sensors and actuators are in a standby state. The mask plate is automatically placed directly above the diaphragm to be welded and is preliminarily aligned through the displacement control module. At this stage, the device will also perform self-diagnosis to check whether all system parameters are normal, including the stability of the laser source, the response speed of the sensors, and the logical processing ability of the control unit.

[0087] Step 2: The mask is positioned above the diaphragm to be welded. Ensure that the light-transmitting holes of the mask are aligned with the welding points of the diaphragm. Adjust the position of the mask through the displacement control module to ensure precise alignment.

[0088] During this process, the light energy sensor and the temperature sensor start to monitor the optical power of the laser and the temperature of the welding area. The control unit receives this data and adjusts the energy controller according to the feedback of the light energy sensor to ensure that the laser power reaches the predetermined level. At the same time, by analyzing the data of the temperature sensor, the control unit guides the mask displacement module to finely adjust the position of the mask until the light-transmitting holes are completely aligned with the diaphragm welding points. During the alignment process, the device uses a precise optical system and algorithms to ensure the accuracy of alignment to avoid any possible welding defects.

[0089] Step 3: The light energy sensor monitors the optical power of the laser source and feeds the data back to the control unit. The control unit adjusts the fiber optic coupler through the energy controller according to the feedback data to ensure that the laser power is stable and meets the welding requirements.

[0090] Step 4: The welding laser source starts to work at the measured power. It irradiates the diaphragm through the light-transmitting holes. At the same time, the temperature sensor measures the temperature distribution around the light-transmitting holes. The control unit calculates the standard deviation of the temperature deviation to determine whether the mask is aligned with the diaphragm.

[0091] The measured power of the laser is lower than the welding power. At the measured power, the material is heated by the laser but does not melt.

[0092] The welding laser source works at the measured power, and the laser preheats the welding area of the diaphragm through the light-transmitting holes. At this time, the temperature sensor measures the temperature distribution around the light-transmitting holes. The control unit calculates the standard deviation of the temperature deviation to verify the alignment accuracy between the mask and the diaphragm. If the alignment is inaccurate, the control unit will send an adjustment signal until the optimal alignment state is reached. This step is crucial for ensuring the welding quality because it allows the device to identify and correct any potential alignment problems before actual welding.

[0093] After confirming the correct alignment, the welding laser source switches to the welding power and starts the welding process. The control unit dynamically adjusts the laser moving speed according to the real-time temperature data to keep the temperature of the welding area stable and prevent overheating or underheating. During the welding process, the device also monitors the physical changes in the welding area, such as the melting and flow of the material, to ensure that the formation of the welded joint meets the design requirements.

[0094] Step 5: Once it is confirmed that the mask is aligned with the diaphragm, the welding laser source switches to the welding power and starts the actual welding process. At the same time, the control unit dynamically adjusts the moving speed of the laser according to the temperature rise rate detected by the temperature sensor to keep the temperature of the welding area stable.

[0095] During the welding process, the optical energy sensor continuously monitors the laser power to ensure the stability of the welding energy. The temperature data provided by the temperature sensor is used to further fine-tune the laser power and the moving speed to compensate for any possible welding deviation. In addition, the device also records all the key parameters during the welding process for subsequent quality control and process optimization.

[0096] The device of the present invention has an intelligent temperature monitoring function and can monitor the temperature of the diaphragm in real time during the welding process. When the temperature detector detects that the temperature of the diaphragm exceeds the preset safety threshold, the system will automatically trigger the safety mechanism and immediately stop the laser welding operation. This effectively prevents the diaphragm from being damaged due to overheating, ensuring the integrity of the material and the welding quality. At the same time, the control unit will record the over-temperature event and issue an alarm so that the operator can check the welding conditions in time or make necessary adjustments. This enhances the reliability of the welding process, reduces the production risk, and ensures the safety of the operator and the device.

[0097] Step Six: After welding is completed, the device enters the cooling and self-check state, and the control unit monitors the temperature of the welding area to ensure that the temperature drops to a safe level;

[0098] In this process, after welding is completed, it enters the cooling mode. The control unit monitors the temperature of the welding area to ensure that the temperature gradually drops to a safe level, preventing the material from being damaged due to thermal stress. During the cooling stage, the device also checks the integrity and uniformity of the welded joint to ensure that the welding quality meets the expected standards.

[0099] Step Seven: After the device completes the self-check and confirms that the welding quality meets the standards, it turns off the welding laser source, completes the entire welding process, and the device is ready for the next welding operation.

[0100] In this process, the device completes the self-check, including checking the welding quality, the status of the sensors, and the positions of the mechanical components. After confirming that everything is normal, the device is ready for the next welding operation or enters the standby mode to wait for a new welding task. In the standby mode, the device will automatically perform necessary maintenance and calibration to ensure that it can operate in the best state during the next welding task.

[0101] So far, the description of the above embodiments is provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. The individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, can be interchanged and used in selected embodiments even if not specifically shown or described. In many respects, the same elements or features can also be changed. Such variations are not considered to deviate from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

[0102] Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. In order to provide a thorough understanding of the embodiments of this disclosure, numerous specific details are set forth, such as examples of specific components, devices, and methods. Obviously, for those skilled in the art, specific details are not required, and the example embodiments may be implemented in many different forms, and neither should be construed as limiting the scope of this disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0103] Here, specific terminology is used for the purpose of describing particular example embodiments only and is not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a" and "the" used herein may also be intended to include the plural forms. The terms "comprising" and "having" are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. Unless explicitly indicated the order of performance, the method steps, processes, and operations described herein are not to be construed as necessarily requiring to be performed in the particular order discussed and illustrated. It should also be understood that additional or alternative steps may be employed.

Claims

1. A welding device for dynamic flat-panel combination earphones based on high temperature shielding, characterized in that: include: The welding laser source is used to emit infrared continuous laser, and the laser passes through the light-transmitting hole to perform laser welding on the welding points of the diaphragm; A mask plate, the mask plate is used to provide high temperature shielding for the diaphragm to be welded, and a light-transmitting hole is opened on the mask plate at a position corresponding to the welding point; The mask is provided with a temperature sensor, which is arranged at the position where the bottom of the light-transmitting hole of the mask contacts the diaphragm, and is used to detect the temperature around the welding area; A control unit, connected to the temperature sensor, controls the moving speed of the welding laser source according to the detected temperature; The mask plate comprises a shielding area and a light-transmitting hole arranged on the shielding area, and an annular detection area is arranged around the light-transmitting hole; The shielding area is made of high temperature resistant reflective material, and the annular detection area is made of multiple layers of material, including a light attenuation layer, a light energy sensor layer, a heat insulation layer and a temperature sensor layer arranged at the bottom in sequence; The light attenuation layer is used to attenuate the light energy irradiated onto the light energy sensor; the heat insulation layer is used to isolate the heat conduction between the light energy sensor and the temperature sensor, and the temperature sensor is arranged at the bottom in contact with the diaphragm to be welded.

2. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 1 is characterized in that: The shape of the mask plate is the same as the diaphragm outer frame of the flat speaker to be welded, and a light-transmitting hole is opened at the edge of the mask plate.

3. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 1 is characterized in that: The control unit is connected to the displacement control module, the welding laser source and the mask; the welding laser source is provided with an energy controller and an optical fiber coupler, and the optical fiber coupler is provided with a coupling adjustment unit, which can adjust the distribution ratio of the optical power output from the welding laser source to the welding laser head, and the energy controller is used to adjust the optical fiber coupler to adjust the distribution ratio of the optical power output from the welding laser source to the welding laser head; The light energy sensor detects the laser energy irradiated by the laser source to the vicinity of the light transmission hole, and the temperature sensor detects the diaphragm temperature near the light transmission hole; The displacement control module connects the laser displacement module and the mask displacement module; the laser displacement module is provided with X-axis and Y-axis driving mechanisms for driving the laser head to move horizontally; the mask displacement module is used to adjust the position of the mask plate and the diaphragm to ensure that the mask plate, the diaphragm and the diaphragm frame are aligned.

4. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 3 is characterized in that: The circular spot formed by the laser emitted by the welding laser source has a diameter ranging from 1.1 times to 1.9 times the diameter of the light transmission hole; the annular detection area includes a plurality of temperature measurement points, which are evenly distributed around the light transmission hole and are used to measure the temperature distribution in the vicinity of the light transmission hole; during measurement, the coupling adjustment unit adjusts the optical power output from the welding laser source to the welding laser head so that the optical power is lower than the welding power; the control unit receives the measurement data of the temperature sensor and calculates the deviation between the temperature value of each measurement point and the average temperature value; the control unit further calculates the standard deviation σ of the temperature deviation to quantify the uniformity of the temperature distribution; The control unit determines the alignment between the light-transmitting hole of the mask and the welding point of the diaphragm according to the standard deviation σ. When σ is less than the preset threshold, it indicates that the temperature distribution is uniform and the mask and the diaphragm are aligned. When σ is greater than or equal to the preset threshold, the control unit sends an adjustment signal to the displacement control module to adjust the position of the mask until the temperature distribution is uniform.

5. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 4 is characterized in that: The control unit further includes a heating rate calculation module, which is used to calculate the temperature increase rate detected by the temperature sensor during the welding process; the control unit adjusts the moving speed of the welding laser source according to the heating rate calculated by the heating rate calculation module, specifically: When the temperature rise rate exceeds a preset threshold, it indicates that the temperature of the welding area rises too fast, and the control unit increases the moving speed of the laser to reduce the irradiation time of the laser in the light-transmitting hole to prevent overheating of the welding area; when the temperature rise rate is lower than the preset threshold, it indicates that the temperature of the welding area rises appropriately, and the control unit will maintain or appropriately adjust the moving speed of the laser to ensure the welding quality; the control unit monitors the temperature data of the temperature sensor in real time through a closed-loop control method, and dynamically adjusts the moving speed of the laser to achieve precise temperature control; The control unit is provided with a PID adjustment function, which uses proportional, integral and differential control algorithms to finely adjust the laser movement speed according to the changing trend of the temperature increase rate to maintain the temperature stability during the welding process; the control unit stores a temperature-speed mapping table, which is pre-set according to historical data and experimental results, and is used to directly map the temperature increase rate to the corresponding laser movement speed to achieve rapid response and precise control; The temperature rise rate is calculated as follows: Temperature rise rate = ΔT / Δt; ΔT is the temperature change detected by the temperature sensor within the time interval Δt; When setting the temperature-speed mapping table, the calculation formula for adjusting the laser moving speed according to the temperature increase rate is: ； Among them, V is the adjusted laser moving speed, V0 is the initial laser moving speed, K p , K i and K d are the proportional, integral and differential coefficients of PID control, T ref is the preset temperature rise rate reference value; The control unit accurately calculates the laser movement speed adjusted according to the temperature rise rate to ensure that the temperature during welding is controlled within the ideal range.

6. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 1 is characterized in that: The high temperature resistant reflective material is a multi-layer composite structure, specifically including: The outer layer is a vacuum-plated layer of aluminum or silver with high reflectivity, which is used to reflect the infrared light emitted by the laser light source. The middle layer is a high-temperature resistant ceramic fiber material, which uses alumina fiber or carbon fiber to provide heat insulation and fire resistance. The inner layer is a high-temperature resistant flexible substrate, which uses silicone rubber or fluororubber to ensure the flexibility and durability of the material in high temperature environments. The outer surface of the shielding area is coated with high-temperature resistant reflective paint, which can work stably in a high temperature environment of not less than 300°C, maintaining its physical properties and reflective properties without significant degradation.

7. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 1 is characterized in that: The optical energy sensor is used to monitor the optical power stability of the laser during welding in real time to ensure that the laser power around the light-transmitting hole meets the welding process requirements; the optical energy sensor can detect the optical energy emitted by the laser source and convert it into an electrical signal, which is then sent to the control unit for analysis and processing; The control unit adjusts the energy controller according to the feedback data of the optical energy sensor to adjust the laser output power.

8. The high temperature shielded dynamic flat panel combined earphone welding device according to claim 7 is characterized in that: The energy controller divides the laser into two beams by adjusting the optical path distribution ratio in the fiber coupler: one beam is directly transmitted to the laser head for welding, and the other beam is input into the light absorption well. By changing the proportion of laser energy input to the light absorption well, the energy controller can finely adjust the laser power reaching the laser head, thereby achieving precise control of the laser power during the welding process.

9. The method for welding a dynamic flat-panel combined earphone welding device based on high temperature shielding according to any one of claims 1 to 8, characterized in that The following steps are involved: Step 1: Start the welding equipment, so that the welding laser source emits infrared continuous laser, and the control unit is initialized and ready to receive signals from the light energy sensor and the temperature sensor; Step 2: The mask is positioned above the diaphragm to be welded, ensuring that the light-transmitting holes of the mask are aligned with the welding points of the diaphragm, and the position of the mask is adjusted by the displacement control module to ensure precise alignment; Step 3: The optical energy sensor monitors the optical power of the laser source and feeds the data back to the control unit. The control unit adjusts the optical fiber coupler through the energy controller according to the feedback data to ensure that the laser power is stable and meets the welding requirements; Step 4: The welding laser source works at a measured power and irradiates the diaphragm through the light-transmitting hole. At the same time, the temperature sensor measures the temperature distribution around the light-transmitting hole. The control unit calculates the standard deviation of the temperature deviation and determines whether the mask is aligned with the diaphragm. Step 5: Once the mask is aligned with the diaphragm, the welding laser source switches to the welding power and the actual welding process begins. At the same time, the control unit dynamically adjusts the moving speed of the laser according to the temperature rise rate detected by the temperature sensor to keep the temperature of the welding area stable. The welding power is higher than the measured power. Under the measured power, the material at the laser irradiation position is heated but not melted. Under the welding power, the material is heated and welded. Step 6: After welding is completed, the equipment enters the cooling and self-test state, and the control unit monitors the temperature of the welding area to ensure that the temperature drops to a safe level; Step 7: After the equipment completes self-inspection and confirms that the welding quality meets the standards, it turns off the welding laser source, completes the entire welding process, and the equipment is ready for the next welding operation.

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