A method and system for assembling a lens and a housing of a photosensor

Abstract

The application relates to the technical field of photoelectric sensor light machine coupling packaging, and discloses a lens and shell assembling method and system of a photoelectric sensor, which comprises the following steps: injecting a photosensitive elastic medium into a micro-fluid control glue injection network through an external liquid injection port to fill an annular gap, so that the lens is in a liquid suspension state wrapped by surface tension in the shell; driving a micro actuator to apply a micro disturbance force, and closed-loop adjusting the lens position to a target optical coplanar position; maintaining the lens at the target optical coplanar position, irradiating the annular gap through multidirectional ultraviolet light on the periphery of the shell, so that the photosensitive elastic medium is photo-crosslinked and solidified, and a flexible damping buffer layer is formed in situ on the periphery of the lens; removing the micro actuator, so that the flexible damping buffer layer forms a reverse plug to complete the airtight locking and assembly of the lens and the shell. The application can realize lossless locking of a high coupling position of the lens and high airtightness and leakage prevention locking, and greatly improves the photoelectric component light machine electrical coupling reliability in a complex environment.

Description

Technical Field

[0001] This invention relates to a method and system for assembling a lens and housing of a photoelectric sensor, belonging to the field of optomechanical coupling packaging technology for photoelectric sensors. Background Technology

[0002] The assembly of the lens and housing of a photoelectric sensor refers to the process of precisely installing and fixing the optical lens to a specific position on the sensor housing. Its core is to ensure that the optical axis of the lens is strictly aligned with the center of the photoelectric device inside the housing and to achieve reliable sealing protection. Its significance lies in directly determining the optical detection accuracy and sensing distance of the sensor, effectively avoiding signal attenuation or false triggering caused by optical path deviation, and ensuring the anti-interference ability and long-term stability of the equipment in complex environments.

[0003] Traditional photoelectric sensors often use rigid snap-fit ​​physical clamping or direct glue application for rigid fixation after pre-positioning when assembling the lens and housing. This rigid solidification assembly cannot absorb tolerances and stresses. Once the lens is fixed, it completely loses the ability to adaptively compensate for the pose based on the actual photoelectric signal. As a result, the assembly stress and mechanical deviation are directly frozen, which can easily cause optical focal length shift or eccentricity, resulting in low yield of finished sensor products and easy failure in complex vibration environments. Summary of the Invention

[0004] This invention provides a method and system for assembling a lens and housing of a photoelectric sensor. Its main purpose is to achieve non-destructive locking of the lens's high-coupling pose and high-airtightness leak-proof locking, which greatly improves the reliability of opto-electro-mechanical coupling of photoelectric components in complex environments.

[0005] To achieve the above objectives, the present invention provides a method for assembling a lens and a housing of a photoelectric sensor, comprising:

[0006] The lens of the photoelectric sensor is placed into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic dispensing network. Photosensitive elastic medium is injected into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; During the window period when the lens maintains the liquid suspension state, the micro actuator is driven to apply a micro-perturbation force, and the lens pose is adjusted in a closed loop to the target optical coplanar position based on the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. The lens is kept in the target optical coplanar position, and the annular gap is irradiated by multi-directional ultraviolet light on the outer periphery of the housing, so that the photosensitive elastic medium is photocrosslinked and cured, and a flexible damping buffer layer is formed in situ on the outer periphery of the lens; Remove the micro actuator to allow the flexible damping buffer layer to form a check plug, thereby completing the airtight locking assembly of the lens and the housing.

[0007] Optionally, based on the intensity of the focal signal incident through the lens, which is collected in real time by the photoelectric sensor, the lens pose is adjusted in a closed loop to the optically coplanar position of the target, including: During the window period in which the lens maintains the liquid suspension state, the micro actuator is controlled to apply a multi-degree-of-freedom micro-perturbation force to the edge of the lens, while the test beam is controlled to be projected onto the photoelectric sensor through the lens, and the intensity of the focal signal received by the photoelectric sensor is collected in real time. The intensity of the focal signal acquired in real time is compared with the preset theoretical peak threshold to form a deviation closed-loop feedback signal; The output displacement of the micro actuator is continuously and dynamically corrected using the deviation closed-loop feedback signal, driving the lens to perform pose adaptive compensation until the intensity of the focal signal reaches a maximum value, and the lens pose at this time is locked as the optical coplanar position of the target.

[0008] Optionally, the micro actuator is a piezoelectric ceramic micro actuator; During the closed-loop adjustment process, the piezoelectric ceramic microactuator drives the lens to perform submicron-level axial translation and radial tilt scanning oscillation within the liquid photosensitive elastic medium at a preset frequency. The scanning swing determines the maximum value of the photoelectric signal peak by traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor.

[0009] Optionally, while traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor, the temperature of the medium liquid of the photosensitive elastic medium is monitored in real time, and the optical focus shift caused by the change in refractive index is calculated based on the temperature coefficient of the refractive index of the photosensitive elastic medium at the medium liquid temperature. The axial coordinates of the target's optical coplanar position are dynamically compensated based on the optical focus offset.

[0010] Optionally, a microfluidic dispensing network is constructed by using pre-fabricated capillary channels in the shell to connect the annular gap and the external injection port, including: Several microcapillary channels are pre-formed inside the side wall of the shell, and the liquid inlet of the microcapillary channels is connected to the external liquid injection port and the liquid outlet of the microcapillary channels is connected to the annular gap to form a side wall guiding channel. An exhaust micro-hole is formed at the top of the housing cavity, and the exhaust micro-hole is connected to an external air extraction device to form an intermittent exhaust structure; The microfluidic dispensing network is constructed by combining the sidewall flow channels, the gap venting structure, and the external injection port.

[0011] Optionally, a photosensitive elastic medium is injected into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state within the housing due to surface tension, including: The photosensitive elastic medium is injected at a constant speed into the microfluidic dispensing network through the external injection port. The photosensitive elastic medium is guided to the bottom of the annular gap by the sidewall guiding channel in the microfluidic dispensing network, and the gas in the annular gap is simultaneously discharged through the gap venting structure during the rising process of the photosensitive elastic medium, forming a bottom filling liquid path; The liquid is continuously injected along the bottom filling channel until the photosensitive elastic medium fills the annular gap. The surface tension of the photosensitive elastic medium causes the lens to break free from the wall constraint within the housing cavity, forming a liquid suspension state wrapped by surface tension.

[0012] Optionally, the annular gap is irradiated with multi-directional ultraviolet light around the outer periphery of the housing, causing the photosensitive elastic medium to undergo photocrosslinking and curing, thereby forming a flexible damping buffer layer in situ around the lens, comprising: Multiple ultraviolet LED light sources distributed in a ring array around the outer periphery of the shell are alternately lit in a time sequence, so that ultraviolet light penetrates the shell from different angles to irradiate the annular gap, thereby inducing the photosensitive elastic medium to undergo a gradient crosslinking reaction, thus obtaining the flexible damping buffer layer.

[0013] Optionally, during the gradient crosslinking reaction, the photosensitive elastic medium near the outer side of the inner wall of the shell is cured before the inner side near the lens. The centripetal contraction stress generated by the curing of the photosensitive elastic medium on the outer side is used to pull the lens for fine-tuning and centering compensation, and the flexible damping buffer layer is formed on the outer periphery of the lens after curing.

[0014] Optionally, the flexible damping buffer layer is made into a check plug to complete the hermetic locking assembly of the lens and the housing, including: After the flexible damping buffer layer is cured and shaped, the micro actuator is removed. The cured flexible damping buffer layer forms a self-supporting anti-reverse plug in the annular gap between the lens and the housing to prevent the lens from retracting, thereby completing the airtight locking assembly of the lens and the housing.

[0015] To address the aforementioned problems, the present invention also provides a lens and housing assembly system for a photoelectric sensor, the system comprising: The adhesive injection network construction module is used to place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic adhesive injection network. The photosensitive elastic medium injection module is used to inject photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; The lens pose adjustment module is used to drive a micro-actuator to apply a micro-perturbation force during the window period when the lens maintains the liquid suspension state, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. A damping buffer layer construction module is used to maintain the lens in the target optical coplanar position. The annular gap is irradiated by multi-directional ultraviolet light on the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens. The airtight locking assembly module is used to remove the micro actuator, so that the flexible damping buffer layer forms a check plug to complete the airtight locking assembly of the lens and the housing.

[0016] This invention achieves directional filling and bubble removal of photosensitive elastic media by constructing a microfluidic injection network, enabling the lens to form a liquid suspension state within the housing under surface tension. This provides an ideal, frictionless, and stress-free operating space for subsequent submicron-level pose calibration. During the liquid suspension window, a piezoelectric ceramic microactuator applies a micro-perturbation force, and closed-loop feedback adjustment is performed based on the focal signal intensity collected in real time by the photoelectric sensor. This drives the lens to perform pose adaptive compensation until it reaches the optimal optical coplanar position. Subsequently, the lens is maintained at this target position, and the medium is induced to undergo gradient cross-linking and curing by multi-directional ultraviolet irradiation around the outer periphery of the housing. A flexible damping buffer layer with centripetal contraction and self-centering characteristics is formed in situ around the lens. Finally, the microactuator is removed, and the cured flexible damping buffer layer forms a self-supporting anti-reverse plug. This achieves a non-destructive and airtight lock between the lens and the housing while locking the high-coupling pose of the lens. This effectively eliminates the assembly stress and tolerance interference caused by traditional physical pressing and significantly improves the long-term stability and opto-mechanical coupling reliability of the optoelectronic components in complex environments. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of a lens and housing assembly system for a photoelectric sensor according to an embodiment of the present invention; Figure 2 This is a micro actuator structure diagram of a lens and housing assembly method for a photoelectric sensor provided in an embodiment of the present invention; Figure 3A functional block diagram of a lens and housing assembly system for a photoelectric sensor provided in an embodiment of the present invention; Figure 4 A schematic diagram of a computer device for assembling a lens and housing of a photoelectric sensor according to an embodiment of the present invention; The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] This application provides a method for assembling a lens and housing of a photoelectric sensor. The execution subject of this method includes, but is not limited to, at least one electronic device configured to execute the method provided in this application, such as a server or a terminal. In other words, the method for assembling a lens and housing of a photoelectric sensor can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster.

[0020] Reference Figure 1 The diagram shown is a schematic flowchart illustrating a method for assembling a lens and housing of a photoelectric sensor according to an embodiment of the present invention. In this embodiment, the method for assembling a lens and housing of a photoelectric sensor includes: S1. Place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. Use the pre-made capillary channel in the housing to connect the annular gap with the external injection port to construct a microfluidic dispensing network.

[0021] This invention places the lens of the photoelectric sensor into the housing cavity, and the pre-reserved annular gap between the outer periphery of the lens and the inner wall of the housing completely isolates the rigid contact between the lens and the housing, eliminating the assembly stress generated by traditional physical pressing. At the same time, it provides the necessary unconstrained free space for subsequent medium filling and adaptive pose calibration during the liquid window period.

[0022] It should be explained that the photoelectric sensor refers to a device that uses the photoelectric effect to detect signals; the lens refers to an optical lens used to converge or conduct light beams; the housing refers to an external support frame used to house and protect internal optical elements; the housing cavity refers to a recessed space inside the housing for mounting the lens; and the annular gap refers to the continuous annular gap reserved between the outer peripheral wall of the lens and the inner wall of the housing cavity after the lens is placed in the housing cavity.

[0023] This invention utilizes pre-fabricated capillary channels in the shell to connect the annular gap with the external injection port, constructing a microfluidic dispensing network to achieve directional guidance and stable filling of the medium. This effectively alleviates the risk of overflow and air bubble retention that are common in traditional dispensing processes, and provides a reliable flow path for the uniform coating of the medium around the lens.

[0024] In detail, the method of constructing a microfluidic dispensing network by utilizing pre-fabricated capillary channels in the shell to connect the annular gap and the external injection port includes: Several microcapillary channels are pre-formed inside the side wall of the shell, and the liquid inlet of the microcapillary channels is connected to the external liquid injection port and the liquid outlet of the microcapillary channels is connected to the annular gap to form a side wall guiding channel. An exhaust micro-hole is formed at the top of the housing cavity, and the exhaust micro-hole is connected to an external air extraction device to form an intermittent exhaust structure; The microfluidic dispensing network is constructed by combining the sidewall flow channels, the gap venting structure, and the external injection port.

[0025] Wherein, the microcapillary channel refers to the pre-formed micro-guided channel inside the sidewall of the shell; the external injection port refers to the opening on the outer wall of the shell for introducing the photosensitive elastic medium; the sidewall guide channel refers to the medium introduction path formed by connecting the two ends of the microcapillary channel to the external injection port and the annular gap respectively; the exhaust micropore refers to the airflow release through hole opened at the top of the shell accommodating cavity; the external suction device refers to the device used to provide negative pressure to extract gas in the gap; the gap exhaust structure refers to the gas exhaust system composed of the exhaust micropore and the external suction device; and the microfluidic dispensing network refers to the flow control system with the functions of directional medium filling and synchronous exhaust constructed by combining the sidewall guide channel, the gap exhaust structure and the external injection port.

[0026] S2. Photosensitive elastic medium is injected into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing.

[0027] This invention injects a photosensitive elastic medium into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension within the housing, effectively avoiding mechanical hard contact between the lens and the housing wall, and providing an ideal working space without friction or stress interference for subsequent submicron level pose calibration.

[0028] Specifically, the step of injecting a photosensitive elastic medium into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state within the housing due to surface tension, includes: The photosensitive elastic medium is injected at a constant speed into the microfluidic dispensing network through the external injection port. The photosensitive elastic medium is guided to the bottom of the annular gap by the sidewall guiding channel in the microfluidic dispensing network, and the gas in the annular gap is simultaneously discharged through the gap venting structure during the rising process of the photosensitive elastic medium, forming a bottom filling liquid path; The liquid is continuously injected along the bottom filling channel until the photosensitive elastic medium fills the annular gap. The surface tension of the photosensitive elastic medium causes the lens to break free from the wall constraint within the housing cavity, forming a liquid suspension state wrapped by surface tension.

[0029] The photosensitive elastic medium refers to a photosensitive liquid polymer material that uses its own surface tension to suspend the lens during injection for non-destructive orientation calibration, and can cross-link and solidify in situ to form a flexible damping coating layer after irradiation with light of a specific wavelength. The gas refers to the residual air that was originally trapped in the annular gap and hindered the filling of the medium. The bottom filling liquid path refers to a bubble-free filling path in which the medium is introduced into the bottom of the annular gap through the side wall guide channel and achieves a smooth upward climb with the help of the exhaust structure. The surface tension refers to the interfacial force generated at the liquid-solid interface of the photosensitive elastic medium filling the gap, which is used to support the lens and isolate the shell wall. The liquid suspension state refers to the suspension state of the lens to be calibrated, which is freed from the mechanical constraint of the shell cavity wall under the interfacial force and is only wrapped by the liquid phase.

[0030] It should be noted that the photosensitive elastic medium may be composed of polyurethane acrylate prepolymer, monofunctional diluent (such as N-vinylpyrrolidone), photoinitiator (such as TPO), and appropriate amount of nanofiller. The nanofiller is used to adjust the temperature coefficient of refractive index.

[0031] S3. During the window period when the lens maintains the liquid suspension state, drive the micro actuator to apply a micro-perturbation force, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor.

[0032] During the window period when the lens maintains its liquid suspension state, this invention enables a micro-actuator to apply a micro-perturbation force, allowing the lens to achieve sub-micron-level flexible translation and alignment in the liquid medium without mechanical friction or stress adhesion, thereby acquiring and locking the target photoelectric coupling peak position. This invention overcomes the assembly tolerance and stress offset defects of traditional mechanical positioning by using the real-time acquisition of the focal signal intensity incident through the lens by a photoelectric sensor to adjust the lens pose to the target optical coplanar position in a closed loop. This achieves sub-micron-level high-precision, calibration-free, and reliable opto-electro-mechanical coupling between the lens and the sensor.

[0033] See Figure 2The diagram shows a micro-actuator structure for a lens and housing assembly method of a photoelectric sensor according to an embodiment of the present invention. The diagram includes components such as a housing, a lens, an annular gap, a micro-actuator (annular piezoelectric ceramic tube), and low-temperature curing conductive adhesive. The micro-actuator is annularly surrounding the lens and bonded to the lens by the low-temperature curing conductive adhesive. It is divided into four quadrants: ①②③④. Each quadrant can be independently voltage-applied to achieve micro-displacement of axial translation and radial tilt. The annular gap is located between the lens and the housing, providing space for subsequent medium filling and pose calibration. The entire structure drives the lens to achieve frictionless submicron-level pose adjustment in a liquid medium through the micro-actuator. Finally, a flexible damping buffer layer is formed on the outer periphery of the lens to complete the airtight locking assembly.

[0034] The low-temperature curing conductive adhesive refers to the conductive adhesive used to bond the annular piezoelectric ceramic tube to the outer periphery of the lens edge; the quadrant refers to the four independent regions into which the annular piezoelectric ceramic tube is divided. By applying independent voltages to different quadrants, the lens can be driven to achieve axial translation and radial tilting respectively.

[0035] Specifically, the step of adjusting the lens pose to the target optical coplanar position based on the real-time acquisition of the focal signal intensity incident through the lens by the photoelectric sensor includes: During the window period in which the lens maintains the liquid suspension state, the micro actuator is controlled to apply a multi-degree-of-freedom micro-perturbation force to the edge of the lens, while the test beam is controlled to be projected onto the photoelectric sensor through the lens, and the intensity of the focal signal received by the photoelectric sensor is collected in real time. The intensity of the focal signal acquired in real time is compared with the preset theoretical peak threshold to form a deviation closed-loop feedback signal; The output displacement of the micro actuator is continuously and dynamically corrected using the deviation closed-loop feedback signal, driving the lens to perform pose adaptive compensation until the intensity of the focal signal reaches a maximum value, and the lens pose at this time is locked as the optical coplanar position of the target.

[0036] The micro-actuator refers to a piezoelectric or micro-mechanical component installed inside the housing to provide precise displacement drive. The window period refers to a specific time period during which the lens is freed from the wall constraint due to the surface tension of the liquid medium and the medium has not yet solidified, allowing for non-destructive adjustment. The micro-perturbation force refers to the driving force of the micro-actuator acting on the edge of the lens to overcome the viscous resistance of the liquid and achieve multi-dimensional micro-displacement. The test beam refers to a specific incident light signal refracted by the lens and projected onto the photosensitive surface. The photoelectric sensor refers to a photoelectric conversion chip that converts the received light signal into an electrical signal. The focal signal intensity refers to the amplitude of the electrical signal output by the photoelectric sensor in real time, reflecting the current optical path coupling quality. The maximum value refers to the maximum electrical signal amplitude output by the photoelectric sensor when the lens and sensor reach the optimal alignment and focusing state. The lens pose refers to the three-dimensional translation coordinates and multi-axis deflection angle of the lens in the spatial coordinate system. The target optical coplanar position refers to the optimal stress-free optomechanical coupling state where the lens optical axis and the photosensitive surface of the photoelectric sensor are precisely aligned and the focal point falls exactly on the photosensitive surface.

[0037] Furthermore, the micro actuator is a piezoelectric ceramic micro actuator; During the closed-loop adjustment process, the piezoelectric ceramic microactuator drives the lens to perform submicron-level axial translation and radial tilt scanning oscillation within the liquid photosensitive elastic medium at a preset frequency. The scanning swing determines the maximum value of the photoelectric signal peak by traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor.

[0038] The piezoelectric ceramic microactuator refers to a miniature driving component attached to the edge of a lens and utilizing the inverse piezoelectric effect to output sub-micron level high-precision displacement. Specifically, the piezoelectric ceramic microactuator is a ring-shaped piezoelectric ceramic tube, which is bonded to the outer periphery of the lens edge using low-temperature curing conductive adhesive. This piezoelectric ceramic tube is divided into four quadrants, each capable of independently applying voltage to drive the lens to achieve axial translation and radial tilting in two directions. For example, applying a voltage of 0-100V can achieve an axial displacement of 0-10μm. The preset frequency refers to a periodic scanning driving frequency that matches the damping characteristics of the liquid medium and avoids excessive lens oscillation. The axial translation and radial tilting scanning oscillations refer to the composite motion of the lens performing multi-dimensional micro-displacements and deflections along the optical axis and perpendicular to the optical axis to traverse the spatial coupling positions. The spatial phase gradient refers to the rate of change of the light wave phase at different spatial positions between the lens and the photoelectric sensor, used to characterize the optimal alignment and focusing state.

[0039] Furthermore, while traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor, the temperature of the medium liquid of the photosensitive elastic medium is monitored in real time, and the optical focus shift caused by the change in refractive index is calculated based on the temperature coefficient of the refractive index of the photosensitive elastic medium at the medium liquid temperature. The axial coordinates of the target's optical coplanar position are dynamically compensated based on the optical focus offset.

[0040] Wherein, the medium liquid temperature refers to the fluid temperature fluctuation value of the photosensitive elastic medium caused by the influence of the environment or driving heat source during the suspension calibration window period; the refractive index temperature coefficient refers to the physical characteristic parameter characterizing the rate of change of the refractive index of the photosensitive elastic medium with temperature; the optical focus offset refers to the axial drift distance of the lens system focus along the optical axis caused by the change in refractive index due to the change in medium temperature; and the axial coordinate refers to the translational position component of the lens relative to the photosensitive surface of the photoelectric sensor along the optical axis in the spatial coordinate system.

[0041] As another optional embodiment of the present invention, the calculation of the optical focus shift caused by the change in refractive index includes: The optical focus shift caused by the change in refractive index is calculated using the following formula:

[0042] in, Indicates the optical focus offset. Represents the temperature coefficient of refractive index. This indicates the change in the temperature of the medium. This indicates the initial focal length of the lens.

[0043] It should be noted that the refractive index temperature coefficient is measured using an Abbe refractometer in conjunction with a constant-temperature circulating water bath. Specifically, the refractive index of the medium is measured at different constant temperatures (e.g., 20℃, 25℃, 30℃), and a relationship curve is plotted. The slope of this curve is the refractive index temperature coefficient. The change in the medium's liquid temperature is obtained by real-time acquisition of the current liquid temperature of the photosensitive elastic medium within a window period using miniature thermistors pre-embedded in the housing cavity or the microfluidic injection network. The initial focal length of the lens is obtained by directly reading the "design focal length" from the lens manufacturer's specifications.

[0044] S4. Maintain the lens in the target optical coplanar position, and irradiate the annular gap with multi-directional ultraviolet light from the outer periphery of the housing to cause the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens.

[0045] This invention maintains the lens in a target optical coplanar position and irradiates the annular gap with multi-directional ultraviolet light from the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and solidify. This forms a flexible damping buffer layer in situ on the outer periphery of the lens, effectively absorbing and buffering mechanical vibrations and temperature deformation stresses in the subsequent use environment while locking the lens in its optimal position, thereby ensuring the long-term stable high coupling performance of the optoelectronic component.

[0046] Specifically, the annular gap is irradiated with multi-directional ultraviolet light through the outer periphery of the housing, causing the photosensitive elastic medium to undergo photocrosslinking and curing, forming a flexible damping buffer layer in situ on the outer periphery of the lens, comprising: Multiple ultraviolet LED light sources distributed in a ring array around the outer periphery of the shell are alternately lit in a time sequence, so that ultraviolet light penetrates the shell from different angles to irradiate the annular gap, thereby inducing the photosensitive elastic medium to undergo a gradient crosslinking reaction, thus obtaining the flexible damping buffer layer.

[0047] The ring array refers to a spatial layout in which multiple ultraviolet light sources are evenly distributed around the outer wall of the shell to achieve omnidirectional illumination. The ultraviolet LED light source refers to a semiconductor light-emitting device that emits ultraviolet light of a specific wavelength to excite the photosensitive elastic medium to undergo a photochemical reaction. The sequential alternating lighting refers to the control logic of activating light sources in different directions in a timed manner according to a preset phase difference and duty cycle to form a rotating scanning dynamic light field. The gradient crosslinking reaction refers to a progressive polymer polymerization process in which the photosensitive elastic medium undergoes a gradual change in the degree of crosslinking from the surface to the interior under light excitation, resulting in asynchronous curing and spatial distribution. The flexible damping buffer layer refers to a cured polymer encapsulation attached to the outer periphery of the lens and having high elastic deformation capability to absorb environmental stress and isolate rigid contact.

[0048] Furthermore, during the gradient crosslinking reaction, the photosensitive elastic medium near the outer side of the inner wall of the shell is cured before the inner side near the lens. The centripetal contraction stress generated by the curing of the photosensitive elastic medium on the outer side is used to pull the lens for fine-tuning and centering compensation, and after curing, the flexible damping buffer layer is formed on the outer periphery of the lens.

[0049] The centripetal contraction stress refers to the inward traction force pointing towards the geometric center of the lens generated by the volume shrinkage during the cross-linking and curing of the outer photosensitive elastic medium. The fine-tuning centering compensation refers to the physical process of using the centripetal contraction stress to perform a small automatic correction of the residual pose deviation of the lens before the medium finally loses its fluidity.

[0050] S5. Remove the micro actuator to make the flexible damping buffer layer form a check plug, so as to complete the airtight locking assembly of the lens and the housing.

[0051] This invention removes the micro-actuator, causing the flexible damping buffer layer to form a backstop, thereby completing the hermetic locking assembly of the lens and the housing. While maintaining the high coupling posture of the lens, it achieves a non-destructive hermetic locking of the lens and the housing, thus providing long-term reliable physical support and environmental protection for the optomechanical components.

[0052] Specifically, the step of forming a check plug with the flexible damping buffer layer to complete the hermetic locking assembly of the lens and the housing includes: After the flexible damping buffer layer is cured and shaped, the micro actuator is removed. The cured flexible damping buffer layer forms a self-supporting anti-reverse plug in the annular gap between the lens and the housing to prevent the lens from retracting, thereby completing the airtight locking assembly of the lens and the housing.

[0053] The self-supporting anti-reverse plug refers to a sealing structure in which a solidified and shaped flexible damping buffer layer, after being detached from the actuator support, fills the annular gap by its own elastic deformation and generates circumferential extrusion force to achieve mechanical self-locking. The posture retraction refers to the slight reverse displacement of the lens from the locked target optical coplanar position due to gravity or residual stress after the actuator is removed. The airtight locking assembly refers to the final encapsulation state in which the lens and the housing achieve a seamless physical fit through the anti-reverse plug to block the intrusion of external moisture and impurities.

[0054] It should be noted that the flexible damping buffer layer expands slightly in volume after curing, further pressing the lens and the housing together and enhancing the sealing and fixing effect.

[0055] Furthermore, the sealing performance of the hermetic locking assembly can be quantitatively determined by the helium leak detection rate. Specifically, the assembled lens and housing are placed in the detection station of a helium mass spectrometer leak detector. When the detected helium leak detection rate is less than [a certain value], the leak is considered sealed. When the lens and housing are locked together, it is determined that the sealing performance meets the airtightness standard; otherwise, if the helium leak detection rate is greater than or equal to... If so, it is determined that it does not meet the airtightness standard.

[0056] The helium leak detection rate refers to a physical quantity that quantifies the rate of gas leakage through tiny gaps at the interface between the lens and the housing; the helium mass spectrometer leak detector is a professional leak detection device that uses the principle of mass spectrometry to accurately detect the concentration of tracer helium molecules in order to determine the sealing performance of the component.

[0057] like Figure 3 The diagram shown is a functional block diagram of the lens and housing assembly system of a photoelectric sensor according to the present invention.

[0058] The lens and housing assembly system 300 for a photoelectric sensor described in this invention can be installed in an electronic device. Depending on the functions to be implemented, the lens and housing assembly system includes a glue-filling network construction module 301, a photosensitive elastic medium injection module 302, a lens pose adjustment module 303, a damping buffer layer construction module 304, and an airtight locking assembly module 305. The module described in this invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, and are stored in the memory of the electronic device.

[0059] In this embodiment of the invention, the functions of each module / unit are as follows: The glue injection network construction module 301 is used to place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap, and the capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic glue injection network. The photosensitive elastic medium injection module 302 is used to inject photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; The lens pose adjustment module 303 is used to drive a micro actuator to apply a micro-perturbation force during the window period when the lens maintains the liquid suspension state, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. The damping buffer layer construction module 304 is used to maintain the lens in the target optical coplanar position. The annular gap is irradiated by multi-directional ultraviolet light from the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens. The airtight locking assembly module 305 is used to remove the micro actuator, so that the flexible damping buffer layer forms a check plug, thereby completing the airtight locking assembly of the lens and the housing.

[0060] In detail, the modules in the lens and housing assembly system 300 of the photoelectric sensor described in this embodiment of the invention employ the same methods as described above during use. Figure 1 The same technical means are used in the lens and housing assembly method of the photoelectric sensor described above, and the same technical effect can be produced, so it will not be repeated here.

[0061] In one embodiment, a computer device is provided, which may be a server or a client, and its internal structure diagram may be as follows: Figure 4As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used for communication with external clients via a network connection. When the computer program is executed by the processor, it implements the functions or steps of a lens and housing assembly method for a photoelectric sensor on the server or client side.

[0062] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps: The adhesive injection network construction module is used to place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic adhesive injection network. The photosensitive elastic medium injection module is used to inject photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; The lens pose adjustment module is used to drive a micro-actuator to apply a micro-perturbation force during the window period when the lens maintains the liquid suspension state, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. A damping buffer layer construction module is used to maintain the lens in the target optical coplanar position. The annular gap is irradiated by multi-directional ultraviolet light on the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens. The airtight locking assembly module is used to remove the micro actuator, so that the flexible damping buffer layer forms a check plug to complete the airtight locking assembly of the lens and the housing.

[0063] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor: The adhesive injection network construction module is used to place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic adhesive injection network. The photosensitive elastic medium injection module is used to inject photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; The lens pose adjustment module is used to drive a micro-actuator to apply a micro-perturbation force during the window period when the lens maintains the liquid suspension state, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. A damping buffer layer construction module is used to maintain the lens in the target optical coplanar position. The annular gap is irradiated by multi-directional ultraviolet light on the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens. The airtight locking assembly module is used to remove the micro actuator, so that the flexible damping buffer layer forms a check plug to complete the airtight locking assembly of the lens and the housing.

[0064] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or computer device described above can be referred to the relevant descriptions on the server side and client side in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0065] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0066] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0068] Finally, it should be noted that in the above embodiments, each embodiment can be combined with each other or independent. Deleting any one of them will not affect the technical implementation of other embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for assembling a lens and housing of a photoelectric sensor, characterized in that, The method includes: The lens of the photoelectric sensor is placed into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic dispensing network. Photosensitive elastic medium is injected into the microfluidic injection network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; During the window period when the lens maintains the liquid suspension state, the micro actuator is driven to apply a micro-perturbation force, and the lens pose is adjusted in a closed loop to the target optical coplanar position based on the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. The lens is kept in the optical coplanar position of the target, and the annular gap is irradiated by multi-directional ultraviolet light from the outer periphery of the housing, causing the photosensitive elastic medium to be photocrosslinked and cured, forming a flexible damping buffer layer in situ on the outer periphery of the lens; Remove the micro actuator to allow the flexible damping buffer layer to form a check plug, thereby completing the airtight locking assembly of the lens and the housing.

2. The method for assembling a lens and housing of a photoelectric sensor as described in claim 1, characterized in that, Based on the real-time acquisition of the focal signal intensity of the incident light through the lens by the photoelectric sensor, the lens pose is adjusted in a closed loop to the optically coplanar position of the target, including: During the window period in which the lens maintains the liquid suspension state, the micro actuator is controlled to apply a multi-degree-of-freedom micro-perturbation force to the edge of the lens, while the test beam is controlled to be projected onto the photoelectric sensor through the lens, and the intensity of the focal signal received by the photoelectric sensor is collected in real time. The intensity of the focal signal acquired in real time is compared with the preset theoretical peak threshold to form a deviation closed-loop feedback signal; The output displacement of the micro actuator is continuously and dynamically corrected using the deviation closed-loop feedback signal, driving the lens to perform pose adaptive compensation until the intensity of the focal signal reaches a maximum value, and the lens pose at this time is locked as the optical coplanar position of the target.

3. The method for assembling a lens and housing of a photoelectric sensor as described in claim 2, characterized in that, The micro actuator is a piezoelectric ceramic micro actuator; During the closed-loop adjustment process, the piezoelectric ceramic microactuator drives the lens to perform submicron-level axial translation and radial tilt scanning oscillation within the liquid photosensitive elastic medium at a preset frequency. The scanning swing determines the maximum value of the photoelectric signal peak by traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor.

4. The method for assembling a lens and housing of a photoelectric sensor as described in claim 3, characterized in that, While traversing the spatial phase gradient of the light field between the lens and the photoelectric sensor, the temperature of the medium liquid of the photosensitive elastic medium is monitored in real time. Based on the temperature coefficient of the refractive index of the photosensitive elastic medium at the medium liquid temperature, the optical focus shift caused by the change in refractive index is calculated. The axial coordinates of the target's optical coplanar position are dynamically compensated based on the optical focus offset.

5. The method for assembling a lens and housing of a photoelectric sensor as described in claim 1, characterized in that, A microfluidic dispensing network is constructed by utilizing pre-fabricated capillary channels in the shell to connect the annular gap with the external injection port, including: Several microcapillary channels are pre-formed inside the side wall of the shell, and the liquid inlet of the microcapillary channels is connected to the external liquid injection port and the liquid outlet of the microcapillary channels is connected to the annular gap to form a side wall guiding channel. An exhaust micro-hole is formed at the top of the housing cavity, and the exhaust micro-hole is connected to an external air extraction device to form an intermittent exhaust structure; The microfluidic dispensing network is constructed by combining the sidewall flow channels, the gap venting structure, and the external injection port.

6. The method for assembling a lens and housing of a photoelectric sensor as described in claim 1, characterized in that, Injecting a photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state within the housing due to surface tension, including: The photosensitive elastic medium is injected at a constant speed into the microfluidic dispensing network through the external injection port. The photosensitive elastic medium is guided to the bottom of the annular gap by the sidewall guiding channel in the microfluidic dispensing network, and the gas in the annular gap is simultaneously discharged through the gap venting structure during the rising process of the photosensitive elastic medium, forming a bottom filling liquid path; The liquid is continuously injected along the bottom filling channel until the photosensitive elastic medium fills the annular gap. The surface tension of the photosensitive elastic medium causes the lens to break free from the wall constraint within the housing cavity, forming a liquid suspension state wrapped by surface tension.

7. The method for assembling a lens and housing of a photoelectric sensor as described in claim 1, characterized in that, The annular gap is irradiated with multi-directional ultraviolet light from the outer periphery of the housing, causing the photosensitive elastic medium to undergo photocrosslinking and curing, thus forming a flexible damping buffer layer in situ on the outer periphery of the lens, comprising: Multiple ultraviolet LED light sources distributed in a ring array around the outer periphery of the shell are alternately lit in a time sequence, so that ultraviolet light penetrates the shell from different angles to irradiate the annular gap, thereby inducing the photosensitive elastic medium to undergo a gradient crosslinking reaction, thus obtaining the flexible damping buffer layer.

8. The method for assembling a lens and housing of a photoelectric sensor as described in claim 7, characterized in that, During the gradient crosslinking reaction, the photosensitive elastic medium near the outer side of the inner wall of the shell is cured before the inner side near the lens. The centripetal contraction stress generated by the curing of the photosensitive elastic medium on the outer side is used to pull the lens to perform fine adjustment and centering compensation, and after curing, the flexible damping buffer layer is formed on the outer periphery of the lens.

9. The method for assembling a lens and housing of a photoelectric sensor as described in claim 1, characterized in that, The flexible damping buffer layer forms a check valve to complete the airtight locking assembly of the lens and the housing, including: After the flexible damping buffer layer is cured and shaped, the micro actuator is removed. The cured flexible damping buffer layer forms a self-supporting anti-reverse plug in the annular gap between the lens and the housing to prevent the lens from retracting, thereby completing the airtight locking assembly of the lens and the housing.

10. A lens and housing assembly system for a photoelectric sensor, characterized in that, The system is used to perform a lens and housing assembly method for a photoelectric sensor as described in any one of claims 1-9, the system comprising: The adhesive injection network construction module is used to place the lens of the photoelectric sensor into the housing cavity, so that the outer periphery of the lens and the inner wall of the housing are reserved with an annular gap. The capillary channel prefabricated in the housing connects the annular gap with the external injection port to construct a microfluidic adhesive injection network. The photosensitive elastic medium injection module is used to inject photosensitive elastic medium into the microfluidic dispensing network through the external injection port until the annular gap is filled, so that the lens is in a liquid suspension state wrapped by surface tension inside the housing; The lens pose adjustment module is used to drive a micro-actuator to apply a micro-perturbation force during the window period when the lens maintains the liquid suspension state, and adjust the lens pose to the target optical coplanar position in a closed loop according to the intensity of the focal signal incident through the lens collected in real time by the photoelectric sensor. A damping buffer layer construction module is used to maintain the lens in the target optical coplanar position. The annular gap is irradiated by multi-directional ultraviolet light on the outer periphery of the housing, causing the photosensitive elastic medium to photocrosslink and cure, forming a flexible damping buffer layer in situ on the outer periphery of the lens. The airtight locking assembly module is used to remove the micro actuator, so that the flexible damping buffer layer forms a check plug to complete the airtight locking assembly of the lens and the housing.

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