Projection module assembly system and assembly method and detection method thereof

Abstract

The application discloses a projection module assembling system and an assembling method and a detection method thereof. The assembling system comprises at least one multi-degree-of-freedom platform, a sensing mechanism and a processing unit. The multi-degree-of-freedom platform is suitable for fixing an optical projection assembly and / or a lens assembly of the projection module. The multi-degree-of-freedom platform can adjust the spatial position of the optical projection assembly and / or the lens assembly at multiple angles. The sensing mechanism comprises a visual receiving device which is movably arranged above the projection module. The visual receiving device is used for sensing image information emitted from the optical projection assembly and passing through the lens assembly. The processing unit is used for processing and judging the image information transmitted by the visual receiving device and transmitting an adjustment signal to the multi-degree-of-freedom platform. Therefore, the relative position of the optical projection assembly and the lens assembly of the projection module can be effectively adjusted through optical detection of the sensing mechanism of the assembling system, and the detection and assembling precision of the projection module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera modules, in particular to a projection module assembly system and an assembly method and detection method thereof. BACKGROUND

[0002] With the continuous improvement of technology and the increasing demand for intelligent production, the development of today's society is subtly changing. Highly intelligent lifestyle and production methods gradually become normalized, and intelligent equipment and intelligent production equipment appear more frequently in life and production. 3D imaging technology can obtain depth information of an object, and further realize 3D face recognition, virtual scene modeling, human-computer interaction and other functions according to the depth information.

[0003] In a structured light projection module, the projection module is used to project light of a specific pattern. Generally, the projection module mainly consists of a projection chip assembly (VCSEL), a collimating element, and an optical diffraction element (DOE). The collimating element and the optical diffraction element are collectively referred to as a lens assembly. When the projection module is working, the projection chip emits light, which is collimated by the collimating element to form a uniform and parallel light beam. Then, the light beam is modulated and copied by the optical diffraction element to form a specific optical pattern and is projected into the projection field. The relative offset and tilt of the installation positions of each component will affect the projected pattern. Therefore, the assembly precision of the projection module is required to be high.

[0004] In the existing camera module detection equipment, the circuit board assembly 4 located at the bottom is the image receiving part, which is located on the equipment clamp platform and takes the circuit board assembly 4, i.e., the assembly with a photosensitive element, as the installation reference. The lens 3 clamped by the clamping jaw 5 is located above the circuit board assembly 4. The spatial pose of the lens 3 clamped by the clamping jaw 5 is adjusted. The extender lens 2 and the target plate 1 are fixed above the lens 3. The light source part of the equipment is at the top. The light source part projects light downward. The light reaches the target plate 1 and then reaches the subsequent assembly downward. Finally, it reaches the photosensitive element to form an image. The extender lens 2 is a convex lens, which can greatly increase the focal length of the camera module to meet the shooting requirements. During detection, the optical centers of the extender lens 2, the lens 3, and the photosensitive element of the circuit board assembly 4 need to be consistent, i.e., the optical axes need to be overlapped, as shown in FIG. 1. Figure 1 The target plate 1 has specific pattern information, which is used to detect the image information capturing ability of the camera module. By adjusting the relative positions of the lens 3 and the circuit board assembly 4, the target plate 1 image obtained by the circuit board assembly 4 reaches the best imaging state. Then, the lens 3 and the circuit board assembly 4 are fixed, and the imaging module with the best imaging effect is obtained. SUMMARY

[0005] The present application aims to provide a projection module assembly system and its assembly method and detection method, which effectively adjusts the relative positions of the optical projection assembly and the lens assembly of the projection module through optical detection of the assembly system, and improves the detection and assembly precision of the projection module.

[0006] Another object of the present application is to provide a projection module assembly system and its assembly method and detection method, which realizes long-distance shooting of the projection module without using a mark plate and a telephoto lens through double-camera alignment, simplifies the internal structure of the equipment, and improves the production efficiency of the projection module.

[0007] To achieve the above-mentioned objects, the technical solution adopted by the present application is as follows:

[0008] According to one aspect of the present application, a projection module assembly system is provided, comprising:

[0009] At least one multi-degree-of-freedom platform, which is adapted to fix the optical projection assembly and / or the lens assembly of the projection module, and which is capable of multi-angle adjustment of the spatial position of the optical projection assembly and / or the lens assembly;

[0010] A sensing mechanism, which comprises a visual receiving device, the visual receiving device being movably located above the projection module, and being used for sensing image information emitted from the optical projection assembly and passing through the lens assembly;

[0011] A processing unit, which is electrically connected to the visual receiving device and the multi-degree-of-freedom platform, and which is used for processing and judging the image information transmitted by the visual receiving device, and transmitting an adjustment signal to the multi-degree-of-freedom platform.

[0012] In one embodiment, the multi-degree-of-freedom platform comprises a first multi-degree-of-freedom platform and a second multi-degree-of-freedom platform, the first multi-degree-of-freedom platform being adapted to fix the optical projection assembly and being capable of multi-angle adjustment of the spatial position of the optical projection assembly, and the second multi-degree-of-freedom platform being adapted to fix the lens assembly of the projection module and being capable of multi-angle adjustment of the spatial position of the lens assembly.

[0013] In one embodiment, the sensing mechanism further comprises a calibration camera, the visual receiving device being movably located between the calibration camera and the lens assembly, and the calibration camera being used for calibrating the relative positions of the lens assembly and the visual receiving device so as to adapt to the relative distance of the real scene.

[0014] In one embodiment, the calibration camera includes an upper calibration camera and a lower calibration camera, the upper calibration camera is movably positioned above the projection module, the upper calibration camera calibrates the position of the projection chip by shooting from top to bottom, the lower calibration camera is movably positioned below the projection module, the lower calibration camera calibrates the position of the lens assembly by shooting from bottom to top.

[0015] In one embodiment, the sensing mechanism further includes a laser height device, the laser height device is movably positioned above the projection module, the laser height device is used to detect the height of each component of the projection module to be assembled.

[0016] In one embodiment, the sensing mechanism further includes a long-focus detection camera, the long-focus detection camera is movably positioned above the projection module, the long-focus detection camera is used to detect the near and far focal length of the projection module.

[0017] In one embodiment, the assembly system of the projection module further includes a rack and at least one driving platform, the sensing mechanism is installed on the rack, the driving platform drives the sensing mechanism to approach or deviate from the projection module at a single angle or multiple angles.

[0018] In one embodiment, the multi-degree-of-freedom platform includes one or more degrees of freedom of forward and backward translation, left and right translation, forward and backward tilt, left and right tilt, up and down movement, and rotation.

[0019] In one embodiment, the first multi-degree-of-freedom platform has a fixed clamp, the optical projection assembly is fixed to the first multi-degree-of-freedom platform through the fixed clamp.

[0020] In one embodiment, the optical projection assembly includes a projection chip and a light conversion assembly, the light conversion assembly is fixed between the projection chip and the lens assembly, the projection chip is adjustably fixed to the fixed clamp of the first multi-degree-of-freedom platform.

[0021] In one embodiment, the second multi-degree-of-freedom platform has a mechanical arm, the lens assembly is arranged on the second multi-degree-of-freedom platform through the mechanical arm.

[0022] According to a second aspect of the present application, a projection module assembly method is provided, including the steps of:

[0023] S1 fixing the optical projection assembly of the projection module to the first multi-degree-of-freedom platform, fixing the lens assembly of the projection module to the second multi-degree-of-freedom platform, the lens assembly is located above the optical projection assembly along the optical axis direction;

[0024] S2 moving the projection module or the visual receiving device so that the visual receiving device is above the lens assembly, the optical projection assembly emits image information towards the lens assembly, the visual receiving device senses the image information passing through the lens assembly and transmits the sensed image information to a processing unit, the processing unit processes and judges the image information transmitted by the visual receiving device and sends an adjustment signal to the first multi-degree-of-freedom platform and the second multi-degree-of-freedom platform;

[0025] S3 the first multi-degree-of-freedom platform adjusts the position of the optical projection assembly according to the adjustment signal, and the second multi-degree-of-freedom platform adjusts the position of the lens assembly according to the adjustment signal, so that the relative positions of the optical projection assembly and the lens assembly are suitable for the projection module to achieve the expected imaging effect;

[0026] S4 fixing the optical projection assembly and the lens assembly so that the optical projection assembly and the lens assembly remain in the adjusted relative positions.

[0027] In one embodiment, the assembly method of the projection module further comprises step S5: adjusting the position of a calibration camera in the optical axis direction, and calibrating the relative positions of the lens assembly and the visual receiving device by the calibration camera so that they are suitable for the relative distance of the real scene.

[0028] In one embodiment, the step S1 specifically comprises the steps of: fixing the projection chip of the optical projection assembly on the fixing clamp of the first multi-degree-of-freedom platform, fixing the lens assembly on the mechanical arm of the second multi-degree-of-freedom platform, and fixing the light conversion assembly of the optical projection assembly along the optical axis between the projection chip and the lens assembly.

[0029] In one embodiment, the assembly method of the projection module further comprises step S6: moving a laser height setting device above the projection module, and detecting the heights of the projection chip, the light conversion assembly and the lens assembly in the optical axis direction by the laser height setting device.

[0030] In one embodiment, the step S2 specifically comprises the steps of:

[0031] S21 moving the projection module or the visual receiving device so that the visual receiving device is above the projection module, the visual receiving device senses the image information emitted from the optical projection assembly and passing through the lens assembly, and transmits the sensed image to a processing unit;

[0032] S22 the processing unit processes and judges according to the expected optical axis, angle, inclination and image distance parameters, and sends an adjustment signal to the first multi-degree-of-freedom platform and the second multi-degree-of-freedom platform.

[0033] In one embodiment, the step S5 specifically comprises steps of:

[0034] S51 calculating the moving direction of the visual receiving device by eyebox algorithm, and moving the visual receiving device and / or the projection module so that the visual receiving device moves to the center of the module eyebox;

[0035] S52 recording the position of the visual receiving device, calibrating the position of the projection chip by shooting from top to bottom through the upper positioning camera, and calibrating the position of the lens assembly by shooting from bottom to top through the lower positioning camera, the upper positioning camera and the lower positioning camera calibrating the relative position of the projection module and the visual receiving device according to the relative distance of the real scene.

[0036] In one embodiment, the assembling method of the projection module further comprises step S7: moving the projection module or the long-focus detection camera so that the long-focus detection camera is above the projection module, and the long-focus detection camera detects the far and near focal length of the projection module.

[0037] In one embodiment, the assembling method of the projection module further comprises step S8: calculating the moving direction of the long-focus detection camera by eyebox algorithm, and moving the long-focus detection camera and / or the projection module so that the long-focus detection camera moves to the center of the module eyebox, and then recording the position of the long-focus detection camera, the optical projection assembly and the lens assembly respectively, to complete the calibration of the long-focus detection camera.

[0038] In one embodiment, the step S4 specifically comprises steps of: applying glue on the base of the projection chip, fixing the projection chip and the light conversion assembly, and then fixing the projection chip and the lens assembly by glue.

[0039] According to another aspect of the present application, a detection method of a projection module assembling system is provided, comprising steps of:

[0040] (1) fixing the optical projection assembly of the projection module on a first multi-degree-of-freedom platform, and fixing the lens assembly of the projection module on a second multi-degree-of-freedom platform, the lens assembly being above the optical projection assembly along the optical axis direction;

[0041] (2) moving the projection module or the visual receiving device so that the visual receiving device is above the lens assembly, the optical projection assembly emitting image information to the lens assembly, the visual receiving device sensing the image information passing through the lens assembly, and transmitting the sensed image information to a processing unit;

[0042] (3) The processing unit determines whether the image information projected by the projection module meets the standard according to the quality of the image information captured by the visual receiving device.

[0043] In one embodiment, the detection method of the projection module further comprises the step of: calibrating the relative positions of the lens assembly and the visual receiving device by the calibration camera, so as to adapt to the relative distance of the real scene. BRIEF DESCRIPTION OF DRAWINGS

[0044] Exemplary embodiments are illustrated in the drawings. The embodiments disclosed in this application and the drawings should be considered illustrative rather than restrictive.

[0045] Figure 1 Structure diagram of traditional camera module detection and assembly;

[0046] Figure 2 Structure diagram of a projection module assembly system according to one embodiment of the application;

[0047] Figure 3 Structure diagram of a projection module assembly system according to another embodiment of the application.

[0048] In the drawings: 1, marker plate; 2, extender lens; 3, lens; 4, circuit board assembly; 11, visual receiving device; 12, calibration camera; 121, upper positioning camera; 122, lower positioning camera; 13, laser height calibration device; 14, long-focus detection camera; 20, rack; 21, receiving driving platform; 22, calibration driving platform; 23, height calibration driving platform; 24, long-focus driving platform; 311, projection chip; 312, light conversion assembly; 32, lens assembly; 40, first multi-degree-of-freedom platform; 50, second multi-degree-of-freedom platform. DETAILED DESCRIPTION

[0049] In the following, the application will be further described in conjunction with specific embodiments. It should be noted that, without conflict, the embodiments described below or the technical features between the embodiments can be combined to form new embodiments.

[0050] In the description of the present application, it should be noted that, for orientation words such as the terms “center”, “transverse”, “longitudinal”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0051] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the descriptive terms used in the context of the present application encompass the various embodiments of the present application.

[0052] The terms "comprise", "comprising", "include", "including", "have", "having" and any variations thereof in the specification and in the claims of the present application are intended to cover both the case where one or more steps or units are included in the process, method, system, product or apparatus and the case where one or more steps or units are not included in the process, method, system, product or apparatus.

[0053] It should be noted that the phrases "essentially", "about", and similar phrases as used in the present application are used as terms of approximation and not as terms of degree, and are intended to account for the inherent deviations in measured or calculated values that would be recognized by those of ordinary skill in the art.

[0054] In the description of the present application, it should also be noted that the terms "set", "mounted", "connected", "linking" and "joint" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, or the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] For the sake of clarity, the terms "substantially" or "generally" are used herein to suggest the possibility of variation in the values of the numerical values known to those skilled in the art. According to one example, the terms "substantially" or "generally" used herein should be interpreted to suggest a possible variation of up to 10% above or below any specified value. According to another example, the terms "substantially" or "generally" used herein should be interpreted to suggest a possible variation of up to 5% above or below any specified value. According to another example, the terms "substantially" or "generally" used herein should be interpreted to suggest a possible variation of up to 2.5% above or below any specified value. For example, the phrase "substantially perpendicular" should be interpreted to include a possible variation of exactly 90°.

[0056] According to one aspect of the present application, as Figure 2As shown, a projection module assembly system is provided, which comprises at least one multi-degree-of-freedom platform, a sensing mechanism and a processing unit. The multi-degree-of-freedom platform is adapted to fix an optical projection assembly and / or a lens assembly 32 of the projection module, and the multi-degree-of-freedom platform is capable of adjusting the spatial position of the optical projection assembly and / or the lens assembly 32 in multiple angles. The sensing mechanism comprises a visual receiving device 11, which is movably located above the projection module. The visual receiving device 11 is used to sense image information emitted from the optical projection assembly and passing through the lens assembly 32. The processing unit is electrically connected to the visual receiving device and the multi-degree-of-freedom platform. The processing unit is used to process and judge the image information transmitted by the visual receiving device, and transmit an adjustment signal to the multi-degree-of-freedom platform. Thus, through optical detection of the sensing mechanism of the assembly system, the relative position of the optical projection assembly and the lens assembly 32 of the projection module is effectively adjusted, and the detection and assembly precision of the projection module is improved.

[0057] In one embodiment, the multi-degree-of-freedom platform comprises a first multi-degree-of-freedom platform 40 and a second multi-degree-of-freedom platform 50. The first multi-degree-of-freedom platform 40 is adapted to fix the optical projection assembly, and the first multi-degree-of-freedom platform 40 is capable of adjusting the spatial position of the optical projection assembly in multiple angles. The second multi-degree-of-freedom platform 50 is adapted to fix the lens assembly 32 of the projection module, and the second multi-degree-of-freedom platform 50 is capable of adjusting the spatial position of the lens assembly 32 in multiple angles. The lens assembly 32 is located above the optical projection assembly along the optical axis direction. The optical projection assembly comprises at least one projection chip 311. The projection chip 311 projects image information upward in an electrically conductive state. The projected image information penetrates through the lens assembly 32. The projection chip 311 can be adjusted in real time in multiple angles in the spatial position by the first multi-degree-of-freedom platform 40. The lens assembly can be adjusted in real time in multiple angles in the spatial position by the second multi-degree-of-freedom platform 50.

[0058] In one embodiment, the multi-degree-of-freedom platform comprises one or more degrees of freedom of forward and backward translation, left and right translation, forward and backward inclination, left and right inclination, up and down movement and rotation. The first multi-degree-of-freedom platform 40 and the second multi-degree-of-freedom platform 50 can be six-degree-of-freedom platforms. The six degrees of freedom of the six-degree-of-freedom platform are respectively forward and backward translation, left and right translation, up and down movement, forward and backward inclination, left and right inclination and rotation. Thus, the first multi-degree-of-freedom platform 40 can adjust the translation amount, angle and inclination of the XYZ position of the projection chip 311. The second multi-degree-of-freedom platform 50 can adjust the translation amount, angle and inclination of the XYZ position of the lens assembly 32, so that the lens assembly 32 adjusts the image information projected by the projection chip 311 in real time.

[0059] In one embodiment, the first multi-degree-of-freedom platform 40 has a fixing clamp. The optical projection assembly is fixed on the first multi-degree-of-freedom platform 40 by the fixing clamp. Thus, the first multi-degree-of-freedom platform 40 performs six-degree-of-freedom movement on the projection chip 311 fixed on the fixing clamp.

[0060] In one embodiment, the second multi-degree-of-freedom platform 50 has a mechanical arm, and the lens assembly 32 is arranged on the second multi-degree-of-freedom platform 50 through the mechanical arm, so that the second multi-degree-of-freedom platform 50 controls the six-degree-of-freedom movement of the lens assembly 32 fixed on the mechanical arm.

[0061] In some embodiments, the second multi-degree-of-freedom platform 50 can also have a suction device to fix the lens assembly 32 by suction, thereby controlling the lens assembly 32.

[0062] In some embodiments, due to different requirements of the projection module, the lens assembly 32 can be one or multiple, and the lens assembly 32 can be arranged in an array or stacked along the optical axis. The mechanical arm is clamped to a position with high structural strength of the lens assembly 32 in an open and close manner to prevent the lens assembly 32 from deforming.

[0063] In some embodiments, the second multi-degree-of-freedom platform 50 and the mechanical arm can adjust the position of the lens assembly 32 in real time, while the first multi-degree-of-freedom platform 40 and the fixing clamp do not move the projection chip 311, or in other words, the projection chip 311 is fixed and only the six-degree-of-freedom position of the lens assembly 32 is adjusted to complete the detection and assembly.

[0064] In some other embodiments, the first multi-degree-of-freedom platform 40 and the fixing clamp can adjust the position of the projection chip 311 in real time, while the second multi-degree-of-freedom platform 50 and the mechanical arm do not move the lens assembly 32, or in other words, the lens assembly 32 is fixed and only the six-degree-of-freedom position of the projection chip 311 is adjusted to complete the detection and assembly.

[0065] In some other embodiments, the first multi-degree-of-freedom platform 40 and the fixing clamp can adjust the multi-degree-of-freedom position of the projection chip 311 in real time, and at the same time, the second multi-degree-of-freedom platform 50 and the mechanical arm can adjust the multi-degree-of-freedom position of the lens assembly 32. Among them, the first multi-degree-of-freedom platform 40 can be responsible for adjusting several degrees of freedom of the projection chip 311, and the second multi-degree-of-freedom platform 50 can be responsible for adjusting several degrees of freedom of the lens assembly 32. The required position adjustment is completed by combining the degrees of freedom adjustment of the two respectively, for example, the first multi-degree-of-freedom platform 40 is responsible for adjusting the three degrees of freedom of the up-down movement, rotation and left-right inclination of the projection chip 311, and the second multi-degree-of-freedom platform 50 is responsible for adjusting the three degrees of freedom of the left-right translation, front-back translation and front-back inclination of the lens assembly 32.

[0066] In some embodiments, the fixed clamp is located at the bottom, and the fixed clamp is provided with a containing groove which is adapted to the projection chip 311 of the to-be-produced module, and the containing groove is further provided with a negative pressure adsorption device or a layer of material with adhesive force on the surface of the containing groove, so that the projection chip 311 is fixed and at the same time the projection chip 311 is kept intact, wherein the projection chip 311 realizes electrical conduction through the corresponding electrical connection setting on the fixed clamp, and projects the predetermined pattern information outward.

[0067] In some embodiments, the adsorption holes of the negative pressure adsorption device can be arranged on the side wall of the containing groove, so that the projection chip 311 or the to-be-processed component can be fixed and adsorbed in multiple directions.

[0068] In one embodiment, the optical projection assembly includes the projection chip 311 and the light conversion component 312, and the light conversion component 312 is fixed between the projection chip 311 and the lens assembly 32, and the projection chip 311 faces at least one side of the light conversion component 312. Wherein, a certain angle, such as 0° or 180°, is arranged between the opposite sides of the projection chip 311 and the light conversion component 312, of course, not limited thereto. Wherein, the light conversion component 312 can process the image information projected by the projection chip 311, such as light turning, light synthesis or light decomposition, of course, the light conversion component 312 can also have other functions or simultaneously have multiple functions,

[0069] In some embodiments, the light conversion component 312 can be fixed first, that is, the light conversion component 312 is positioned and fixed by a mechanical positioning device, and the projection chip 311 and the lens assembly 32 are located on both sides of the light conversion component 312 based on the light conversion component 312, and the lens assembly 32 and / or the projection chip 311 are adjusted in real time to make the image information sensed by the visual receiving device 11 achieve the expected effect, and then the projection chip 311 and the light conversion component 312 are fixed by adhesive.

[0070] In some embodiments, the assembly system of the projection module further includes a rack 20 and at least one driving platform, and the sensing mechanism is installed on the rack 20, and the driving platform drives the sensing mechanism to approach or deviate from the projection module at a single angle or multiple angles, and the driving platform includes a receiving driving platform 21, and the visual receiving device 11 is connected to the rack 20 through the receiving driving platform 21, and the receiving driving platform 21 drives the visual receiving device 11 to realize displacement with multiple degrees of freedom, such as six degrees of freedom.

[0071] In some embodiments, the sensing mechanism further comprises a calibration camera 12, the visual receiving device 11 is movably located between the calibration camera 12 and the lens assembly 32, and the calibration camera 12 is used to calibrate the relative position of the projection module and the visual receiving device 11, so as to adapt to the relative distance of the real scene. Among them, the driving platform further comprises a calibration driving platform 22, and the calibration camera 12 is adjusted up and down in the Z direction, i.e. along the optical axis direction, through the calibration driving platform 22, so that the movement precision is higher, of course, each driving platform is not limited by the movement range, and different driving platforms can be arranged according to different needs, such as the receiving driving platform 21 which can move left and right and forward and backward, and the calibration camera 12 which can move up and down. Among them, the calibration camera 12 can move up and down along the optical axis direction to complete detection and calibration, while in the production process of the traditional camera module, detection and calibration are completed by moving the clamped to-be-assembled components. The present application does not need to use a macro lens and a calibration board, and the movement of the calibration camera 12 is used to replace the up-down displacement of the to-be-assembled projection module, that is, the movement of the calibration camera 12 which does not affect the assembly precision of the module is used to replace the movement of the to-be-assembled component which is not required for assembly, so as to avoid that the to-be-assembled projection chip 311 and the lens assembly 32 are moved multiple times in the calibration process, thereby generating a large variation and affecting the subsequent assembly precision.

[0072] That is, the calibration camera 12 has a complete optical system (a relatively large number of lenses), so as to realize high-precision detection, and the calibration camera 12 has a small volume. In the traditional detection process, a macro lens is generally used, and the optical structure of the macro lens is simple, the precision cannot meet the requirements, and the volume is relatively large, so it is not easy to adjust the installation space.

[0073] In some embodiments, the sensing mechanism further comprises a laser height fixing device 13, the laser height fixing device 13 is movably located above the projection module, and the laser height fixing device 13 is used to detect the height of each component of the to-be-assembled projection module. The height of the projection chip 311, the light conversion assembly 312 and the lens assembly 32 is detected by the laser height fixing device 13, so as to facilitate the mutual approach of the projection chip 311 and the lens assembly 32 by the first multi-degree-of-freedom platform 40 and the second multi-degree-of-freedom platform 50 in the assembly process. Among them, the driving platform further comprises a height fixing driving platform, and the laser height fixing device 13 is movably installed on the rack 20 through the height fixing driving platform, so as to move in the multi-degree-of-freedom XYZ direction with a large stroke.

[0074] In some embodiments, the sensing mechanism further comprises a long-focus detection camera 14 movably positioned above the projection module, the long-focus detection camera 14 being configured to detect the far and near focal length of the projection module. The driving platform further comprises a long-focus driving platform 24, the long-focus detection camera 14 being movably mounted on the rack 20 by the long-focus driving platform 24, so as to be capable of multi-degree-of-freedom XYZ-direction movement with a large stroke, as shown in Figure 3

[0075] In some embodiments, the calibration camera 12 comprises an upper positioning camera 121 and a lower positioning camera 122, the upper positioning camera 121 being movably positioned above the projection module, the upper positioning camera 121 being configured to calibrate the position of the projection chip 311 by shooting from top to bottom, the lower positioning camera 122 being movably positioned below the projection module, the lower positioning camera 122 being configured to calibrate the position of the lens assembly 32 by shooting from bottom to top, so as to calibrate the relative position of the projection module and the visual receiving device 11 by the upper positioning camera 121 and the lower positioning camera 122, so as to be suitable for the relative distance of the real scene. The upper positioning camera 121 can be used to calibrate the position of the projection chip 311 and the lens assembly 32, and the lens assembly 32 can be more accurately assembled above the projection chip 311 by the lower positioning camera 122.

[0076] In some embodiments, the lens assembly 32 has certain optical properties, so that the image information projected by the projection chip 311 can be sensed by the receiving end (such as the human eye, the screen, the camera, etc.) after being processed by the lens assembly 32. The visual receiving device 11 is a human eye simulator camera, which can replace the human eye to receive image information and detect whether the image information meets the requirements of the human eye.

[0077] According to a second aspect of the present application, a method for assembling a projection module is provided, comprising the steps of:

[0078] S1 fixing the optical projection assembly of the projection module to the first multi-degree-of-freedom platform 40, and fixing the lens assembly 32 of the projection module to the second multi-degree-of-freedom platform 50, the lens assembly 32 being positioned above the optical projection assembly along the optical axis direction;

[0079] S2 moving the projection module or the visual receiving device 11 so that the visual receiving device 11 is positioned above the lens assembly 32, the optical projection assembly emitting image information towards the lens assembly 32, the visual receiving device 11 sensing the image information passing through the lens assembly 32 and transmitting the sensed image information to the processing unit, the processing unit processing and judging the image information transmitted by the visual receiving device 11 and transmitting an adjustment signal to the first multi-degree-of-freedom platform 40 and the second multi-degree-of-freedom platform 50;

[0080] ​S3 The first multi-degree-of-freedom platform 40 adjusts the position of the optical projection assembly through an adjustment signal, and the second multi-degree-of-freedom platform 50 adjusts the position of the lens assembly 32 through an adjustment signal, so that the relative positions of the optical projection assembly and the lens assembly 32 are suitable for the projection module to achieve the expected imaging effect.

[0081] S4 The optical projection assembly and the lens assembly 32 are fixed, so that the optical projection assembly and the lens assembly 32 are kept at the relative positions determined by the adjustment.

[0082] In some embodiments, step S2 specifically comprises the steps of:

[0083] S21 The projection module or the visual receiving device 11 is moved so that the visual receiving device 11 is located above the projection module, the visual receiving device 11 senses the image information emitted from the optical projection assembly and passing through the lens assembly 32, and transmits the sensed image to the processing unit.

[0084] S22 The processing unit processes and judges according to the expected optical axis, angle, inclination and image distance parameters, and sends an adjustment signal to the first multi-degree-of-freedom platform 40 and the second multi-degree-of-freedom platform 50.

[0085] Wherein, the visual receiving device 11 can take image information, and then transmit it to the computer processing unit, so as to judge the projection effect and adjust the relative positions of the lens assembly 32 and the optical projection assembly, so as to achieve the expected projection effect, and fix the lens assembly 32 and the optical projection assembly under the condition of the best projection effect, which can be fixed by adhesive or welding.

[0086] In some embodiments, step S4 specifically comprises the steps of: applying glue to the base of the projection chip 311, fixing the projection chip 311 and the light conversion assembly 312, and then fixing the projection chip 311 and the lens assembly 32 through the glue. That is, when using adhesive for fixing, taking glue as an example, the lens assembly 32 is first moved away by the second multi-degree-of-freedom platform 50, then glue is arranged on the upper surface of the base where the projection chip 311 is located by using a glue drawing device, and the glue is applied to the optical projection assembly below, which not only effectively utilizes the relatively large base, but also is beneficial to prevent the dripping of glue. The projection chip 311 as the base is generally stationary or has a small range of movement, and the action is gentle, so it is not easy to affect the glue. After the glue drawing is completed, the lens assembly 32 is moved back to the previous position by the second multi-degree-of-freedom platform 50, and the lens assembly 32 and the optical projection assembly are fixedly connected through the glue, and then the glue is quickly cured by irradiation of an ultraviolet lamp, so as to realize the relative fixation of the lens assembly 32 and the optical projection assembly.

[0087] In some embodiments, the assembling method of the projection module further comprises step S5: adjusting the position of the calibration camera 12 in the optical axis direction, calibrating the relative position of the lens assembly 32 and the visual receiving device 11 by the calibration camera 12, so as to adapt to the relative distance of the real scene.

[0088] In some embodiments, step S1 specifically comprises the steps of: fixing the projection chip 311 of the optical projection assembly on the fixing clamp of the first multi-degree-of-freedom platform 40, fixing the lens assembly 32 on the mechanical arm of the second multi-degree-of-freedom platform 50, and fixing the light conversion assembly 312 of the optical projection assembly along the optical axis between the projection chip 311 and the lens assembly 32.

[0089] In some embodiments, the assembling method of the projection module further comprises step S6: moving the laser height setting device 13 above the projection module, and detecting the height of the projection chip 311, the light conversion assembly 312 and the lens assembly 32 in the optical axis direction by the laser height setting device 13.

[0090] In some embodiments, the assembling method of the projection module further comprises step S7: moving the projection module or the long-focus detection camera 14 so that the long-focus detection camera 14 is above the projection module, and the long-focus detection camera 14 detects the near and far focal lengths of the projection module.

[0091] The visual receiving device 11, the calibration camera 12, the laser height setting device 13 and the long-focus detection camera 14 realize composite space positioning and detection of each component of the projection module to be assembled, which is beneficial to high-precision assembly of the projection module. Meanwhile, the multiple driving platforms can drive each sensing mechanism in multiple degrees of freedom.

[0092] In some embodiments, the assembling system and the assembling method of the projection module are suitable for various projection modules, such as AR (VR, MR) glasses, projectors and the like.

[0093] In some embodiments, step S5 specifically comprises the steps of:

[0094] Step S5 specifically comprises the steps of:

[0095] S51 calculates the moving direction of the visual receiving device 11 by the eyebox algorithm, and moves the visual receiving device 11 and / or the projection module so that the visual receiving device 11 moves to the center of the module eyebox;

[0096] S52 records the position of the visual receiving device 11, calibrates the position of the projection chip 311 by shooting from top to bottom through the upper positioning camera 121, calibrates the position of the lens assembly 32 by shooting from bottom to top through the lower positioning camera 122, and calibrates the relative position of the projection module and the visual receiving device 11 according to the relative distance of the real scene by the upper positioning camera 121 and the lower positioning camera 122.

[0097] In some embodiments, the assembling method of the projection module further comprises step S8: calculating the moving direction of the long-focus detection camera 14 by the eyebox algorithm, and moving the long-focus detection camera 14 and / or the projection module so that the long-focus detection camera 14 moves to the center of the eyebox of the module, and then recording the positions of the long-focus detection camera 14, the optical projection assembly and the lens assembly 32 respectively, to complete the calibration of the long-focus detection camera 14.

[0098] According to another aspect of the present application, a detection method of a projection module assembling system is provided, comprising steps of:

[0099] (1) fixing the optical projection assembly of the projection module on the first multi-degree-of-freedom platform 40, and fixing the lens assembly 32 of the projection module on the second multi-degree-of-freedom platform 50, the lens assembly 32 being located above the optical projection assembly along the optical axis direction;

[0100] (2) moving the projection module or the visual receiving device 11 so that the visual receiving device 11 is located above the lens assembly 32, the optical projection assembly emitting image information towards the lens assembly 32, the visual receiving device 11 sensing the image information passing through the lens assembly 32 and transmitting the sensed image information to the processing unit;

[0101] (3) the processing unit judging whether the image information projected by the projection module meets the standard according to the quality of the image information captured by the visual receiving device 11.

[0102] In one embodiment, the detection method of the projection module further comprises the step of calibrating the relative positions of the lens assembly 32 and the visual receiving device 11 by the calibration camera 12 so as to be suitable for the relative distance of the real scene.

[0103] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A projection module assembly system, characterized by, The application relates to a projection module and a sensing mechanism thereof. The projection module comprises: at least one multi-degree-of-freedom platform, which is adapted to fix an optical projection assembly and / or a lens assembly of the projection module, and is capable of adjusting the spatial position of the optical projection assembly and / or the lens assembly in multiple angles; a sensing mechanism, which comprises a visual receiving device, the visual receiving device being movably located above the projection module, and being used for sensing image information emitted from the optical projection assembly and passing through the lens assembly; 2. The projection module assembly system of claim 1, wherein, a processing unit, which is electrically connected with the visual receiving device and the multi-degree-of-freedom platform, and is used for processing and judging the image information transmitted by the visual receiving device, and transmitting an adjustment signal to the multi-degree-of-freedom platform, wherein the sensing mechanism further comprises a calibration camera, the visual receiving device is movably located between the calibration camera and the lens assembly, and the calibration camera is used for calibrating the relative position of the lens assembly and the visual receiving device, so as to adapt to the relative distance of a real scene.

3. The projection module assembly system of claim 2, wherein, The multi-degree-of-freedom platform comprises a first multi-degree-of-freedom platform and a second multi-degree-of-freedom platform, the first multi-degree-of-freedom platform is adapted to fix the optical projection assembly, and is capable of adjusting the spatial position of the optical projection assembly in multiple angles, and the second multi-degree-of-freedom platform is adapted to fix the lens assembly of the projection module, and is capable of adjusting the spatial position of the lens assembly in multiple angles.

4. The projection module assembly system of claim 3, wherein, The first multi-degree-of-freedom platform has a fixing clamp, and the optical projection assembly is fixed on the first multi-degree-of-freedom platform through the fixing clamp.

5. The projection module assembly system of claim 4, wherein, The optical projection assembly comprises a projection chip and a light conversion assembly, the light conversion assembly is fixed between the projection chip and the lens assembly, and the projection chip is adjustably fixed on the fixing clamp of the first multi-degree-of-freedom platform.

6. The projection module assembly system of claim 5, wherein, The calibration camera comprises an upper positioning camera and a lower positioning camera, the upper positioning camera is movably located above the projection module, the upper positioning camera calibrates the position of the projection chip by shooting from top to bottom, the lower positioning camera is movably located below the projection module, and the lower positioning camera calibrates the position of the lens assembly by shooting from bottom to top.

7. The projection module assembly system of claim 6, wherein, The sensing mechanism further comprises a laser height fixing device, the laser height fixing device is movably located above the projection module, and is used for detecting the height of each component of the projection module to be assembled.

8. The projection module assembly system according to any one of claims 1 to 6, wherein The sensing mechanism further comprises a long-focus detection camera, the long-focus detection camera is movably located above the projection module, and is used for detecting the far and near focal length of the projection module.

9. The projection module assembly system according to any one of claims 1 to 6, wherein, The application further comprises a rack and at least one driving platform, the sensing mechanism is mounted on the rack, and the driving platform is capable of driving the sensing mechanism to approach or deviate from the projection module in single angle or multiple angles. The multi-degree-of-freedom platform comprises one or more degrees of freedom of front and back translation, left and right translation, front and back inclination, left and right inclination, up and down movement and rotation.

10. The projection module assembly system of claim 2, wherein, The second multi-degree-of-freedom platform has a mechanical arm, and the lens assembly is arranged on the second multi-degree-of-freedom platform through the mechanical arm.

11. A method of assembling a projection module, the method comprising: The method comprises the steps of: S1, fixing an optical projection assembly of the projection module on a first multi-degree-of-freedom platform and fixing a lens assembly of the projection module on a second multi-degree-of-freedom platform, the lens assembly being located above the optical projection assembly along an optical axis direction; S2, moving the projection module or a visual receiving device so that the visual receiving device is located above the lens assembly, the optical projection assembly emitting image information towards the lens assembly, the visual receiving device sensing the image information passing through the lens assembly and transmitting the sensed image information to a processing unit, the processing unit processing and judging the image information transmitted by the visual receiving device and transmitting an adjustment signal to the first multi-degree-of-freedom platform and the second multi-degree-of-freedom platform; S3, the first multi-degree-of-freedom platform adjusting the position of the optical projection assembly through the adjustment signal, and the second multi-degree-of-freedom platform adjusting the position of the lens assembly through the adjustment signal, so that the relative positions of the optical projection assembly and the lens assembly are suitable for the projection module to achieve an expected imaging effect; S4, fixing the optical projection assembly and the lens assembly so that the optical projection assembly and the lens assembly remain in the adjusted relative positions; S5, adjusting the position of a calibration camera in the optical axis direction and calibrating the relative positions of the lens assembly and the visual receiving device through the calibration camera so that the relative positions are suitable for the relative distance of a real scene.

12. The method of claim 11, wherein: The step S1 specifically comprises the steps of: fixing a projection chip of the optical projection assembly on a fixing clamp of the first multi-degree-of-freedom platform, fixing the lens assembly on a mechanical arm of the second multi-degree-of-freedom platform, and fixing a light conversion assembly of the optical projection assembly along the optical axis between the projection chip and the lens assembly.

13. The method of assembling a projection module according to claim 12, wherein, The method further comprises a step S6 of moving a laser height setting device above the projection module and detecting the heights of the projection chip, the light conversion assembly and the lens assembly in the optical axis direction through the laser height setting device.

14. The method of assembling a projection module according to claim 12 or 13, wherein, The step S2 specifically comprises the steps of: S21, moving the projection module or the visual receiving device so that the visual receiving device is located above the projection module, the visual receiving device sensing the image information emitted from the optical projection assembly and passing through the lens assembly and transmitting the sensed image to a processing unit; S22, the processing unit processing and judging according to expected optical axis, angle, inclination and image distance parameters and sending an adjustment signal to the first multi-degree-of-freedom platform and the second multi-degree-of-freedom platform.

15. The method of claim 14, wherein: The step S5 specifically comprises the steps of: S51, calculating the moving direction of the visual receiving device through an eyebox algorithm and moving the visual receiving device and / or the projection module so that the visual receiving device moves to the center of the module eyebox; S52 record the position of the visual receiving device, calibrate the position of the projection chip by shooting from top to bottom through the upper positioning camera, calibrate the position of the lens assembly by shooting from bottom to top through the lower positioning camera, the upper positioning camera and the lower positioning camera calibrate the relative position of the projection module and the visual receiving device according to the relative distance of the real scene.

16. The method of claim 11, wherein: It further comprises the step S7: moving the projection module or the long-focus detection camera, so that the long-focus detection camera is located above the projection module, and the long-focus detection camera detects the far and near focal length of the projection module.

17. The method of claim 16, wherein: It further comprises the step S8: Through the eyebox algorithm, the moving direction of the long-focus detection camera is calculated, and the long-focus detection camera and / or the projection module are moved so that the long-focus detection camera moves to the center of the module eyebox, and then the positions of the long-focus detection camera, the optical projection assembly and the lens assembly are recorded respectively, and the calibration of the long-focus detection camera is completed.

18. The method of claim 12, wherein: The step S4 specifically comprises the step of: applying glue to the base of the projection chip, fixing the projection chip and the light conversion assembly, and then fixing the projection chip and the lens assembly by glue.

19. The method of claim 1-10, wherein the method further comprises: It comprises the steps of: (1) fixing the optical projection assembly of the projection module on the first multi-degree-of-freedom platform, and fixing the lens assembly of the projection module on the second multi-degree-of-freedom platform, the lens assembly being located above the optical projection assembly along the optical axis direction; (2) moving the projection module or the visual receiving device, so that the visual receiving device is located above the lens assembly, the optical projection assembly emits image information towards the lens assembly, the visual receiving device senses the image information passing through the lens assembly, and transmits the sensed image information to a processing unit, wherein the relative position of the lens assembly and the visual receiving device is calibrated by the calibration camera, so as to adapt to the relative distance of the real scene; (3) the processing unit judges whether the image information projected by the projection module meets the standard according to the quality of the image information shot by the visual receiving device.

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