A miniature connector optical detection platform

Abstract

This utility model relates to the field of optical inspection technology, specifically to an optical inspection platform for miniature connectors, comprising: a substrate with a stand fixedly mounted on its top; a high-precision stage module consisting of an X-axis precision linear module, a Y-axis precision linear module, a Z-axis precision linear module, and a stage; a vacuum nozzle clamp on the surface of the stage, which integrates a miniature vacuum pump and achieves negative pressure adsorption via a control panel for adsorbing and fixing miniature connectors. This utility model overcomes the shortcomings of existing technologies by achieving full-surface coverage inspection of connectors through data fusion of vertical and tilt cameras, solving the blind spot problem; automatic Z-axis elevation of the stage, combined with image clarity feedback, ensures consistent imaging of connectors at different heights.

Description

Technical Field

[0001] This utility model relates to the field of optical inspection technology, specifically to an optical inspection platform for miniature connectors. Background Technology

[0002] With the rapid development of electronic technology, micro connectors have been widely used in various electronic devices. These micro connectors are characterized by their small size and precise structure, and their quality directly affects the performance and reliability of electronic devices. Therefore, it is crucial to conduct accurate testing of micro connectors during the production process.

[0003] Currently, the inspection of miniature connectors mainly relies on manual visual inspection or traditional mechanical inspection methods. Manual visual inspection is inefficient and easily affected by the subjective factors of the inspectors. While traditional mechanical inspection methods improve the inspection efficiency to some extent, the stage movement accuracy of mechanical inspection methods is insufficient and cannot meet the precision positioning requirements of miniature connectors. Furthermore, it is difficult to capture defects in hidden areas such as the side walls and bottom terminals of the connector by using only a single angle light source or camera imaging.

[0004] To address the aforementioned technical issues, a micro-connector optical inspection platform is proposed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a micro connector optical inspection platform, which overcomes the shortcomings of the prior art and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a micro connector optical inspection platform, comprising:

[0007] Substrate and support frame fixed on substrate;

[0008] High-precision stage module: It consists of an X-axis precision linear module, a Y-axis precision linear module, a Z-axis precision linear module and a stage. The stage surface is equipped with a vacuum nozzle clamp, which integrates a miniature vacuum pump. Negative pressure adsorption is achieved through the control panel and is used to adsorb and fix miniature connectors.

[0009] Multi-angle optical imaging module: includes a coaxial light source camera group vertically mounted in the middle of the stand and two symmetrically distributed lateral tilt camera groups on the stand. The coaxial light source camera group is equipped with a ring coaxial light source and a telecentric lens. The optical axis of the lateral tilt camera group forms an angle of 30° to 60° with the stage plane and is equipped with an adjustable wavelength strip light source.

[0010] The control panel includes a motion control module and an image processing system.

[0011] Motion control module: It realizes multi-axis linkage of the stage and camera focusing control through servo motors, encoders and PLC controllers;

[0012] Image processing system: A GPU-based real-time image processing unit that integrates defect classification algorithms to analyze connector surface defects, dimensional deviations, and terminal coplanarity.

[0013] The connector to be tested is placed on the stage and fixed by vacuum adsorption. The XYZ axes are moved to the preset position, and the coaxial light source camera captures the top image. The side camera group captures the tilted images on both sides respectively. The image processing system compares the images with the standard template and outputs the defect type and coordinates.

[0014] As a preferred technical solution of this utility model, the X-axis precision linear module, the Y-axis precision linear module, and the Z-axis precision linear module all adopt ball screw transmission, and the vacuum nozzle clamp is composed of a replaceable nozzle array with a nozzle orifice diameter ranging from 0.5mm to 2mm, which is suitable for adsorption and positioning of micro connectors of different sizes.

[0015] Equipped with a pneumatic vacuum nozzle clamp, it is compatible with the quick fixation of connectors of different sizes.

[0016] As a preferred technical solution of this utility model, the working distance of the coaxial light source camera group is 50mm~150mm, the lens magnification is 2x~10x, and the light source wavelength range is 400nm~850nm.

[0017] The coaxial light source camera assembly is vertically mounted above the stage and equipped with a ring coaxial light source for detecting scratches, stains, and planar dimensions on the connector surface.

[0018] As a preferred technical solution of this utility model, the adjustable wavelength strip light source of the side-tilted camera group is a multi-band adjustable LED array that supports switching between white light, infrared (850nm~940nm) and ultraviolet (365nm~405nm) light sources.

[0019] The side-tilt camera group uses two sets of high-resolution CMOS cameras symmetrically distributed at an angle of 30° to 60°, along with a strip light source, to capture the coplanarity of the side wall terminals and solder joint defects.

[0020] As a preferred technical solution of this utility model, a side angle bracket is provided for rotatable connection between the side tilt camera group and the stand, and a motor is configured and connected to the outside of the side tilt camera group to support stepless locking of the camera tilt angle within the range of 30° to 60°.

[0021] As a preferred technical solution of this utility model, the motion control module adopts the EtherCAT bus communication protocol to realize the synchronous triggering of the stage and the camera group, with a trigger delay of ≤1ms. The PLC controller has a built-in adaptive focusing algorithm to dynamically adjust the Z-axis height according to the image clarity feedback.

[0022] As a preferred embodiment of this utility model, the defect classification algorithm of the image processing system includes:

[0023] A morphologically based edge detection module is used to identify connector contour dimensional deviations.

[0024] Deep learning-based object detection models (YOLO or ResNet architecture) are used to classify surface scratches, stains, and missing parts defects.

[0025] As a preferred embodiment of this utility model, the bottom of the substrate is fixedly mounted with a shock-absorbing base in a rectangular array.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] By fusing data from vertical and tilt cameras, full-surface coverage detection of connectors is achieved, solving the blind spot problem. The stage automatically rises and falls along the Z-axis, and combined with image clarity feedback, the imaging consistency of connectors at different heights is ensured. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0029] Figure 2 This is a front view schematic diagram of the present utility model;

[0030] Figure 3 For the present utility model Figure 1 A magnified view of a portion of point A in the middle.

[0031] In the diagram: 1. Substrate; 2. X-axis precision linear module; 3. Y-axis precision linear module; 4. Z-axis precision linear module; 5. Stage; 6. Replaceable nozzle; 7. Stand; 8. Control panel; 9. Coaxial light source camera assembly; 10. Ring coaxial light source; 11. Side bracket; 12. Lateral tilt camera assembly; 13. Motor; 14. Adjustable wavelength strip light source; 15. Shockproof base. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1-3 A micro connector optical inspection platform, comprising:

[0034] Substrate 1 and stand 7 fixed on substrate 1;

[0035] High-precision stage module: It consists of X-axis precision linear module 2, Y-axis precision linear module 3, Z-axis precision linear module 4 and stage 5. The surface of stage 5 is equipped with vacuum nozzle clamps, which integrate micro vacuum pumps and achieve negative pressure adsorption through control panel 8 for adsorbing and fixing micro connectors.

[0036] Multi-angle optical imaging module: includes a coaxial light source camera group 9 vertically mounted in the middle of the stand 7 and two symmetrically distributed lateral tilt camera groups 12 on the stand 7. The coaxial light source camera group 9 is equipped with a ring coaxial light source 10 and a telecentric lens. The optical axis of the lateral tilt camera group 12 forms an angle of 30° to 60° with the plane of the stage 5 and is equipped with an adjustable wavelength strip light source 14.

[0037] Control panel 8 includes a motion control module and an image processing system;

[0038] Motion control module: It realizes multi-axis linkage of the stage and camera focusing control through servo motors, encoders and PLC controllers;

[0039] Image processing system: A GPU-based real-time image processing unit that integrates a defect classification algorithm to analyze connector surface defects, dimensional deviations, and terminal coplanarity;

[0040] The connector to be tested is placed on the stage 5. The control panel 8 controls the replaceable suction nozzle 6 to vacuum adsorb and fix it. The motion control module controls the servo motors of the XYZ axes to drive the stage 5 to the preset position. The coaxial light source camera takes the top image, and the side camera group takes the tilted images on both sides respectively. The image processing system compares with the standard template and outputs the defect type and coordinates.

[0041] Specifically, the X-axis precision linear module 2, Y-axis precision linear module 3, and Z-axis precision linear module 4 all adopt ball screw drive. The vacuum nozzle clamp consists of an array of replaceable nozzles 6 with a nozzle orifice diameter ranging from 0.5mm to 2mm, which is suitable for adsorption and positioning of micro connectors of different sizes. Equipped with a pneumatic vacuum nozzle clamp, it is compatible with the rapid fixation of connectors of different sizes.

[0042] Specifically, the working distance of the coaxial light source camera group 9 is 50mm~150mm, the lens magnification is 2x~10x, and the light source wavelength range is 400nm~850nm. The coaxial light source camera group is vertically mounted above the stage 5 and is equipped with a ring coaxial light source for detecting scratches, stains and planar dimensions on the connector surface.

[0043] Specifically, the adjustable wavelength strip light source 14 of the side-tilt camera group 12 is a multi-band adjustable LED array that supports switching between white light, infrared 850nm~940nm and ultraviolet 365nm~405nm light sources. The side-tilt camera group 12 uses two sets of high-resolution CMOS cameras symmetrically distributed at an angle of 30°~60°, combined with the strip light source, to capture the coplanarity of the side wall terminals and solder joint defects.

[0044] Specifically, a side bracket 11 is rotatably connected between the side tilt camera group 12 and the stand 7, and a motor 13 is connected to the outside of the side tilt camera group 12 to support stepless locking of the camera tilt angle within the range of 30° to 60°.

[0045] Specifically, the motion control module adopts the EtherCAT bus communication protocol to achieve synchronous triggering between the stage 5 and the camera group, with a trigger delay of ≤1ms. The PLC controller has a built-in adaptive focusing algorithm that dynamically adjusts the Z-axis height based on image clarity feedback.

[0046] Specifically, defect classification algorithms for image processing systems include:

[0047] A morphologically based edge detection module is used to identify connector contour dimensional deviations.

[0048] Deep learning-based object detection models such as YOLO or ResNet are used to classify surface scratches, stains, and missing parts defects.

[0049] Specifically, the bottom of the substrate 1 is fixedly mounted with a shock-absorbing base 15 in a rectangular array.

[0050] Working principle: The connector to be tested is placed on stage 5 and fixed by vacuum adsorption. The XYZ axes are moved to the preset position. The coaxial light source camera takes the top image, and the side camera group takes the tilted images on both sides respectively. The image processing system compares with the standard template and outputs the defect type and coordinates.

[0051] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A micro-connector optical inspection platform, characterized by, include: The substrate (1) and the stand (7) fixed on the substrate (1). High-precision stage module: It consists of X-axis precision linear module (2), Y-axis precision linear module (3), Z-axis precision linear module (4) and stage (5). The surface of stage (5) is provided with vacuum nozzle clamp. The vacuum nozzle clamp integrates a micro vacuum pump and achieves negative pressure adsorption through control panel (8) for adsorbing and fixing micro connectors. Multi-angle optical imaging module: including a coaxial light source camera group vertically mounted in the middle of the stand (7). (9) and two sets of lateral tilt camera groups (12) symmetrically distributed on the stand (7). The coaxial light source camera group (9) is equipped with a ring coaxial light source (10) and a telecentric lens. The optical axis of the lateral tilt camera group (12) is at an angle of 30°~60° to the plane of the stage (5) and is equipped with an adjustable wavelength strip light source (14). Control panel (8), which includes a motion control module and an image processing system; Motion control module: The multi-axis linkage of the stage (5) and camera focusing control are achieved through servo motors, encoders and PLC controllers; Image processing system: A GPU-based real-time image processing unit that integrates defect classification algorithms to analyze connector surface defects, dimensional deviations, and terminal coplanarity.

2. The micro-connector optical inspection platform of claim 1, wherein: The X-axis precision linear module (2), Y-axis precision linear module (3), and Z-axis precision linear module (4) all adopt ball screw drive. The vacuum nozzle clamp is composed of an array of replaceable nozzles (6), with a nozzle aperture range of 0.5mm to 2mm, which is suitable for adsorption and positioning of micro connectors of different sizes.

3. The micro-connector optical inspection platform of claim 1, wherein: The working distance of the coaxial light source camera group (9) is 50mm~150mm, the lens magnification is 2 times~10 times, and the light source wavelength range is 400nm~850nm.

4. The micro-connector optical inspection platform of claim 1, wherein: The tunable wavelength strip light source (14) of the side-tilted camera group (12) is a multi-band tunable LED array that supports white light, infrared light with a wavelength of 850nm~940nm, and violet light with a wavelength of 365nm~405nm. External light source switching.

5. The micro-connector optical inspection platform of claim 1, wherein: The lateral tilt camera group (12) is rotatably connected to the stand (7) by a side angle bracket (11), and a motor (13) is connected to the outside of the lateral tilt camera group (12) to support stepless locking of the camera tilt angle within the range of 30° to 60°.

6. The micro-connector optical inspection platform of claim 1, wherein: The motion control module adopts the EtherCAT bus communication protocol to realize the synchronous triggering of the stage (5) and the camera group. The triggering delay is ≤1ms. The PLC controller has a built-in adaptive focusing algorithm to dynamically adjust the Z-axis height according to the image clarity feedback.

7. The micro-connector optical inspection platform of claim 1, wherein: The defect classification algorithm of the image processing system includes: A morphologically based edge detection module is used to identify connector contour dimensional deviations. A deep learning-based object detection model, using either the YOLO or ResNet architecture, is used to classify surface scratches, stains, and missing parts defects.

8. The micro-connector optical inspection platform of claim 1, wherein: The bottom of the substrate (1) is fixedly mounted with a shockproof base (15) in a rectangular array.

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