Combination light source structure module

Abstract

The application discloses a kind of combination light source structure module, including surface light source component, multiple strip light components and combined fixing support;The fixing support includes the first support for fixing surface light source component and the second support for fixing strip light component, and strip light component is connected with the second support by angle adjusting mechanism, and can be rotated and adjusted relative thereto;Spacing adjusting mechanism is arranged between the first support and the second support, for adjusting the relative distance of both in vertical direction.Second support is provided with camera fixing component, for installing camera, and makes camera shooting optical axis and surface light source component central axis keep preset positional relationship;Fixing support bottom is provided with connecting base, for being connected with external three-axis equipment.The application can realize flexible configuration and fine adjustment of multiple light source forms and camera posture in the same module, and it is convenient to quickly build optical imaging environment adapted to different detection scenes.

Description

Technical Field

[0001] This invention relates to the field of machine vision inspection technology, specifically to a combined light source structure module adapted to a three-axis motion device. Background Technology

[0002] In machine vision inspection systems, the light source is one of the core components affecting image quality and inspection accuracy. Three-axis motion devices (such as three-axis slides and three-axis robotic arms) can realize multi-dimensional movement and attitude adjustment of workpieces or cameras in space, and are widely used in scenarios requiring large-area, multi-position imaging, such as multi-station inspection on production lines and partial scanning of large workpieces. To meet the imaging needs of different stations and attitudes, combined light source modules are usually installed on three-axis devices, such as the use of area light sources in conjunction with bar lights or ring lights.

[0003] Existing combined light sources often employ fixed installation structures for their strip light components (such as rigid fixation via brackets or clips), providing only single or a few preset angles of supplementary lighting. Even in structures where the strip light can rotate within a certain range relative to the bracket, the adjustable angle range is limited, and often requires locking mechanisms such as screws for graded positioning, making the adjustment process cumbersome. These structures struggle to cover a continuous angle range from 0° top lighting to 90° side lighting, failing to meet the full coverage requirements of supplementary lighting angles for complex workpieces in various scenarios such as side defect detection, planar texture enhancement, and edge contour extraction. This results in insufficient imaging contrast or severe highlighting in some key feature areas, affecting the stability of the algorithm's recognition.

[0004] In existing technologies, surface light sources and strip lights often adopt an integrated or fixed frame structure, and the vertical distance between them is determined in the design stage and cannot be adjusted later according to the actual object being inspected. When inspecting small, highly reflective precision workpieces, the fixed and close distance between the light sources can easily lead to local overexposure and reflection saturation; while when inspecting larger or darker workpieces, the fixed and remote position of the light source will cause insufficient illumination in the edge areas, resulting in uneven overall light intensity distribution, causing the inspection results to fluctuate with changes in workpiece size and material.

[0005] Existing combined light source modules mostly use a single flat bracket or simple frame for fixation. During the high-speed movement and frequent start-stop of the three-axis equipment, the bracket is prone to slight bending, twisting, or vibration, which in turn causes changes in the posture and relative position of the light source. In addition, the camera is often independently mounted on another mounting surface of the three-axis equipment or on an additional bracket. There is a lack of an integrated, rigid connection structure between the camera and the light source, making it difficult to ensure the coaxiality and repeatability of the camera's optical axis and the area illuminated by the light source. Summary of the Invention

[0006] This invention aims to address the problems of existing combined light source modules adapted to three-axis motion equipment, such as limited adjustment range of light source angle, non-adjustable spacing between surface light source and strip light, poor structural stability, and insufficient precision in cooperation with cameras and three-axis equipment. It provides a combined light source structure module for three-axis equipment, which enables flexible adjustment of illumination angle and illumination distribution, while improving the structural stability and installation positioning accuracy of the module during three-axis motion, and ensuring the consistency of camera imaging and detection accuracy.

[0007] To achieve the above objectives, the present invention proposes a combined light source structure module for a three-axis device, comprising: a surface light source assembly, multiple strip light assemblies, a combined fixing bracket, an angle adjustment mechanism, a spacing adjustment mechanism, a camera fixing assembly, and a connecting base. The combined fixing bracket includes a first support member for fixing the surface light source assembly and a second support member for fixing the strip light assemblies, the first and second support members being arranged vertically in space.

[0008] The surface light source assembly is preferably a rectangular LED surface light source, with its back side fixedly mounted via a first support member. The first support member is preferably constructed as an X-shaped metal bracket, with its four ends used for screwing and fixing to the heat dissipation substrate of the surface light source assembly.

[0009] The plurality of strip light components are preferably four, with identical specifications among them, and all arranged along the periphery of the surface light source component. The second support is preferably constructed as a U-shaped frame, the inner frame size of which is adapted to the outer contour size of the surface light source component, so that the U-shaped frame fits around the surface light source component, and the four strip light components are respectively arranged on the four sides of the U-shaped frame.

[0010] To achieve flexible adjustment of the strip light illumination angle, each strip light component is connected to the second support member via an angle adjustment mechanism. The angle adjustment mechanism is a damped rotary connection structure. The strip light component is mounted on the side of the second support member via this structure. The damped rotary connection structure has a built-in damping element that provides stable damping friction within an adjustment range of 0° to 90°, allowing the strip light component to hover and position itself at any angle within the adjustment range without additional locking components. Specifically, the 0° state is defined as when the light-emitting surface of the strip light component is parallel to the light-emitting surface of the surface light source component, and the 90° state is defined as when they are perpendicular to each other, covering various typical lighting angle requirements such as top lighting, oblique side lighting, and side lighting.

[0011] To accommodate the light intensity distribution requirements of workpieces of different sizes and materials, a spacing adjustment mechanism is provided between the first and second supports to adjust their relative height. This spacing adjustment mechanism includes several sets of adjusting screws, preferably four, with one end connected to the second support and the other end connected to the first support. By synchronously rotating each adjusting screw, the second support is raised and lowered vertically relative to the first support, thereby changing the vertical spacing between the surface light source assembly and the strip light assembly. Locking nuts are provided on the adjusting screws for locking and fixing after adjustment to the target spacing. Preferably, the vertical spacing between the surface light source assembly and the strip light assembly can be continuously adjusted within the range of 10mm to 50mm.

[0012] To ensure a stable relative relationship between the camera and the illumination area of ​​the light source, the camera mounting assembly is mounted on the second support member and is used to install the industrial camera, maintaining a preset positional relationship between the camera's optical axis and the central axis of the surface light source assembly. Preferably, the camera mounting assembly is an L-shaped bracket, including a horizontal arm and a vertical arm connected perpendicularly to each other. The horizontal arm is fixed to the top of the second support member, and the vertical arm is used to mount the camera, ensuring that the optical axis of the camera lens coincides with the central geometric axis of the surface light source assembly, with a coaxiality error controlled to ≤0.1mm. Through this structure, the optical axis position of the camera remains stable during the movement of the three-axis equipment, reducing the need for repeated calibration.

[0013] To achieve a reliable connection between the light source module and the external three-axis equipment, this invention includes a connecting base at the bottom of the combined fixed bracket. The connecting base connects to the center of the first support member and is used to mate with the mounting surface of the three-axis slide or three-axis robotic arm. The fastening structure includes several mounting holes or screws distributed on the left and right sides of the connecting base. This multi-point bolt connection improves connection strength and vibration resistance, preventing loosening and displacement during high-speed three-axis movement and frequent start-stop operations.

[0014] In summary, this invention achieves stable installation of the surface light source assembly and the strip light assembly through a combined fixing bracket consisting of an X-shaped first support and a U-shaped second support; through a damped rotation connection structure, it enables continuous adjustment and arbitrary angle positioning of the four strip light assemblies between 0° and 90°, meeting the lighting angle requirements of different shooting scenarios; through multiple sets of spacing adjustment screws and locking nuts, it achieves precise adjustment of the vertical spacing between the surface light source and the strip light within the range of 10mm to 50mm; and through an L-shaped camera fixing assembly, it achieves high-precision coaxial installation of the camera optical axis and the central axis of the surface light source.

[0015] Compared with the prior art, the present invention has the following beneficial effects: With the damped rotation connection structure, the four strip light components can be continuously adjusted within the range of 0° to 90° and can be stably suspended at any angle without the need for additional locking parts. The appropriate supplementary lighting angle can be quickly obtained in different vision tasks such as side defect detection, planar texture detection and edge contour enhancement.

[0016] The spacing between the surface light source and the strip light can be adjusted within the range of 10mm to 50mm by means of a spacing adjustment mechanism. This allows for flexible configuration of the illumination distribution for workpieces of different sizes and with different surface reflectivity, avoiding local overexposure or insufficient edge illumination, and improving imaging quality and detection stability.

[0017] The L-shaped camera mounting assembly is directly installed on top of the second support member, and the coaxiality error between the camera optical axis and the central axis of the surface light source is ≤0.1mm through structural cooperation. This can significantly reduce the initial calibration of the machine vision system and the repeated calibration work during long-term use, thereby improving the detection efficiency.

[0018] The combined light source structure module of the present invention is suitable for various machine vision application scenarios such as precision parts inspection, electronic component appearance defect identification, and product size measurement. It is particularly suitable for installation on multi-axis motion platforms such as three-axis slides or three-axis robotic arms, and can provide a highly stable and highly adjustable light source solution in complex shooting environments. Attached Figure Description

[0019] Figure 1 A schematic diagram of the combined light source structure module installed on a three-axis device.

[0020] Figure 2 A schematic diagram of the main structure of the combined light source module.

[0021] Figure 3 Enlarged schematic diagram of the damped rotational connection between the strip light assembly and the second support member.

[0022] Figure 4 Enlarged schematic diagram of the mounting structure of the camera fixing assembly and the first support member. Detailed Implementation

[0023] Reference Figures 1 to 4 This invention provides a combined light source structure module 100, which is suitable for installation on a three-axis motion device (not shown in the figure) for multi-angle adjustable illumination and imaging of the workpiece under test. This embodiment describes the structure of each component and their interconnection.

[0024] like Figure 1 and Figure 2As shown, the combined light source structure module 100 in this embodiment mainly includes a surface light source assembly 200, multiple strip light components 300, a combined fixing bracket 400, an angle adjustment mechanism 500, a spacing adjustment mechanism 600, a camera fixing assembly 700, and a connecting base 800. The surface light source assembly 200 is preferably located in the central part of the module to provide large-area uniform surface illumination. In specific implementations, the surface light source assembly 200 can be a rectangular LED surface light source with a heat dissipation substrate on its back to ensure thermal stability during long-term operation. Multiple strip light components 300 are arranged around the surface light source assembly 200. In this embodiment, four strip light components 300 are preferably arranged corresponding to the four sides of the surface light source assembly 200, forming a "U"-shaped surrounding illumination structure, thereby achieving multi-directional supplementary lighting for the workpiece.

[0025] To ensure stable installation and position / or attitude adjustment of the aforementioned light source components, the module is equipped with a modular fixing bracket 400. The modular fixing bracket 400 includes a first support member 410 for fixing the surface light source component 200 and a second support member 420 for fixing the strip light component 300. The first support member 410 is preferably constructed as an X-shaped metal bracket, preferably made of a metal material with good rigidity and light weight, such as aluminum alloy, and is integrally formed, with an overall X-shaped structure. The surface light source component 200 is fixed to the four ends of the X-shaped metal bracket with screws, achieving four-point support for the surface light source component 200.

[0026] The second support member 420 is preferably constructed as a U-shaped frame structure, with a hollow rectangular frame and an inner cavity. The second support member 420 is spatially fitted around the surface light source assembly 200, meaning the surface light source assembly 200 is located within the inner frame area of ​​the U-shaped frame, and the two are arranged concentrically or nearly concentrically in horizontal projection. To ensure a compact structure and avoid interference, the inner frame size of the second support member 420 is adapted to the outer contour size of the surface light source assembly 200, and can be equal to or slightly larger than the outer contour size of the surface light source assembly 200 to allow for a small assembly gap. This "frame-wrapped-surface" fitting relationship allows the strip light assembly 300 to be arranged close to the edge of the surface light source assembly 200, reducing the overall volume and eliminating lighting dead zones. It also ensures that the second support member 420 will not mechanically interfere with the surface light source assembly 200 when it moves up and down via the spacing adjustment mechanism.

[0027] The strip light components 300 are mounted on the four sides of the second support member 420, and each strip light component 300 is connected to the second support member 420 via an angle adjustment mechanism 500. The angle adjustment mechanism 500 is specifically a damped rotary connection structure 510. The damped rotary connection structure 510 is located at the connection position between the end of the strip light component 300 and the side of the second support member 420.

[0028] Optionally, the damping rotary connection structure 510 is provided with damping elements, such as damping pads, friction plates, or contact structures filled with damping grease, to generate a stable damping friction torque between the rotating mating surfaces. Through this damping rotary connection structure 510, the strip light assembly 300 can be rotated relative to the second support 420 about its own mounting axis, with the adjustment stroke covering an angle range of 0° to 90°.

[0029] In this embodiment, the 0° position is defined as when the light-emitting surface of the bar light component 300 is parallel to the light-emitting surface of the surface light source component 200. At this position, the bar light component 300 mainly provides approximate top lighting or parallel supplementary lighting. The 90° position is defined as when the light-emitting surface of the bar light component 300 is perpendicular to the light-emitting surface of the surface light source component 200. At this position, the bar light component 300 mainly provides side lighting or grazing illumination. Since the damping rotary connection structure 510 can provide sufficient damping friction torque throughout the entire adjustment range of 0° to 90°, the operator only needs to apply an appropriate torque to rotate the bar light component 300 to the desired angle. After releasing the torque, the bar light component 300 can be suspended and stabilized at any angle position by relying on the damping friction force, without the need for additional locking screws or pressure plates. This achieves continuous adjustment and arbitrary angle suspension positioning of the bar light component 300 within the range of 0° to 90°.

[0030] To adapt to the light field distribution requirements in different detection scenarios, this embodiment provides a spacing adjustment mechanism 600 between the first support member 410 and the second support member 420. This mechanism adjusts the relative distance between the two in the vertical direction, thereby changing the vertical spacing between the surface light source assembly 200 and the strip light assembly 300. The spacing adjustment mechanism 600 includes several sets of adjusting screws 610, preferably four sets, which are arranged at the four corners of the support structure to ensure balance and stability during lifting. The adjusting screws 610 are arranged vertically, with one end connected to the second support member 420 and the other end connected to the first support member 410. Specifically, the threaded end of the adjusting screw 610 can be threaded into the internal threaded hole on the second support member 420, and the other end is connected to the first support member 410 through a rotatable connection or mating hole.

[0031] By synchronously rotating each adjusting screw 610 using a tool, the relative motion of the threaded pair is converted into linear lifting and lowering motion of the second support 420 relative to the first support 410 (direction as follows). Figure 2As indicated by the arrow in the middle, this causes the strip light assembly 300 mounted on it to rise or fall as a whole. To prevent the adjusting screws 610 from rotating and loosening under conditions of high-speed movement, sudden stop, or vibration of the three-axis equipment, a locking nut 620 is provided on each adjusting screw 610 in this embodiment. After the vertical distance between the surface light source assembly 200 and the strip light assembly 300 is adjusted to the target value, the locking nut 620 is tightened to apply axial clamping force to the threaded pair, eliminating thread clearance, thereby effectively preventing the adjusting screws 610 from loosening or rotating during operation, and ensuring that the set light source distance remains stable over a long period of time.

[0032] In this embodiment, the vertical distance between the surface light source component 200 and the strip light component 300 can be adjusted within the range of 10mm to 50mm. This range can take into account both the high illumination requirements of small-sized workpieces and the soft lighting requirements of large-sized or highly reflective workpieces, and has strong adaptability.

[0033] To ensure a precise relative relationship between the camera and the light source, this embodiment provides a camera mounting assembly 700 on the top of the second support member 420. The camera mounting assembly 700 is preferably an L-shaped bracket structure, including a horizontal arm 701 and a vertical arm 702 connected perpendicularly to each other. The horizontal arm 701 is fixedly mounted on the top of the second support member 420, and the vertical arm extends vertically along 702 to mount the camera 730. By precisely machining and fitting the mounting position and mounting holes of the L-shaped bracket, it can be ensured that after the camera 730 is installed, its lens optical axis maintains a preset positional relationship with the central geometric axis x of the surface light source assembly 200.

[0034] In this embodiment, the preset positional relationship is preferably designed such that the camera optical axis coincides with the central geometric axis of the surface light source assembly 200, that is, to achieve coaxial installation of the two and control the coaxiality error within 0.1mm. Through the integrated structure of the camera fixing assembly 700 and the second support member 420, a high-precision coaxial relationship between the camera and the light source is ensured, and the overall rigidity of the second support member 420 is used to improve the vibration resistance of the camera installation, reducing the need for repeated calibration during long-term operation of the system.

[0035] The combined light source structure module 100 is connected to an external triaxial device via a connecting base 800. The connecting base 800 is located on the side of the combined fixed bracket 400 and can be rigidly connected to the central area of ​​the first support member 410 or to the bracket frame 820, thereby transferring the gravity and motion load of the entire module to the mounting surface of the triaxial device. This ensures positional accuracy during installation and connection reliability during operation.

[0036] This application also includes a fastening structure well-known to those skilled in the art for reliably fixing the positioned connecting base 800 to the triaxial device. In this embodiment, the fastening structure includes a plurality of mounting holes or screws distributed on the left and right sides of the connecting base 800. The mounting holes or screws can be symmetrically distributed to apply a uniform clamping force to the connection interface in a multi-point fastening manner, resisting the inertial loads and vibration loads generated by the module during high-speed triaxial movement and frequent start-stop operations.

[0037] In summary, the combined light source structure module 100 described in this embodiment achieves stable installation and compact layout of the surface light source assembly 200 and the strip light assembly 300 by setting a combined fixing bracket 400 including an X-shaped first support member 410 and a U-shaped second support member 420; the damped rotary connection structure 510 enables continuous angle adjustment and arbitrary angle hovering positioning of the strip light assembly 300 within the range of 0° to 90°; the spacing adjustment mechanism 600, including an adjusting screw 610 and a locking nut 620, enables adjustable and reliable locking of the vertical spacing between the surface light source assembly 200 and the strip light assembly 300 from 10mm to 50mm; and the L-shaped camera fixing assembly 700 achieves high-precision coaxiality between the camera optical axis and the central geometric axis of the surface light source assembly 200.

[0038] It should be noted that the above detailed description of the combined light source structure module 100 of the present invention, in conjunction with the accompanying drawings, is only a preferred embodiment of the present invention and is used to help understand the technical solution and working process of the present invention. It does not constitute a limitation on the scope of protection of the present invention. After reading this specification, those skilled in the art will find that the specific specifications of the surface light source assembly 200 and the strip light assembly 300, the structural shape and material selection of the first support member 410 and the second support member 420, the number and arrangement of the adjusting screws and locking nuts in the spacing adjustment mechanism 600, the damping structure of the angle adjustment mechanism 500, and the specific dimensions and mounting hole positions of the camera fixing assembly 700 and the connecting base 800 can all be equivalently replaced or appropriately changed according to actual application requirements. For example, changing the number of strip light assemblies, adjusting the adjustable range of angle and spacing, selecting support members with different cross-sectional shapes, and using other types of positioning pins and fasteners, etc., as long as they do not depart from the spirit and essence defined by the claims of the present invention, should all fall within the scope of protection of the present invention.

Claims

1. A combined light source structure module, characterized in that, include: Surface light source assembly; Multiple strip light components; A modular fixing bracket includes a first support member for fixing the surface light source assembly and a second support member for fixing the strip light assembly; An angle adjustment mechanism connects the strip light component to the second support member, enabling the strip light component to be rotated and adjusted relative to the second support member; A spacing adjustment mechanism, connecting the first support member and the second support member, is used to adjust the relative distance between the first support member and the second support member in the vertical direction; A camera mounting assembly is disposed on the second support member for mounting a camera, and the camera's optical axis is kept in a preset positional relationship with the central axis of the surface light source assembly. A connecting base is attached to the side of the combined fixed bracket for connection to an external triaxial device.

2. The combined light source structure module according to claim 1, characterized in that: The angle adjustment mechanism is a damped rotary connection structure, and the strip light component is installed on the side of the second support member through the damped rotary connection structure.

3. The combined light source structure module according to claim 2, characterized in that: The number of strip light components is four, which are respectively installed on the four sides of the second support member through the damping rotation connection structure; the stroke of the angle adjustment mechanism covers an angle range of 0° to 90°, where 0° means that the light-emitting surface of the strip light component is parallel to the light-emitting surface of the surface light source component, and 90° means that the two are perpendicular.

4. The combined light source structure module according to claim 1, characterized in that: The spacing adjustment mechanism includes several sets of adjusting screws. One end of each adjusting screw is connected to the second support member, and the other end is connected to the first support member. By synchronously rotating the adjusting screws, the second support member is driven to rise and fall relative to the first support member.

5. A combined light source structure module according to claim 4, characterized in that: The adjusting screw is equipped with a locking nut, and the vertical distance between the surface light source assembly and the strip light assembly can be adjusted from 10mm to 50mm.

6. A combined light source structure module according to claim 1, characterized in that: The first support is constructed as an X-shaped metal bracket, and the surface light source assembly is fixed to the four ends of the X-shaped metal bracket.

7. A combined light source structure module according to claim 1, characterized in that: The second support member is constructed as a U-shaped frame, which is fitted around the periphery of the surface light source assembly, and the inner frame size of the U-shaped frame is adapted to the outer contour size of the surface light source assembly.

8. A combined light source structure module according to claim 1, characterized in that: The camera mounting assembly is an L-shaped bracket, including a horizontal arm and a vertical arm that are perpendicularly connected to each other; the horizontal arm is fixed to the top of the second support member, and the vertical arm is used to mount the camera; the preset positional relationship is that the optical axis of the camera lens coincides with the central geometric axis of the surface light source assembly, and the coaxiality error is ≤0.1mm.

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