A lighting positioning method for a copper clad ceramic substrate

Abstract

The application discloses a kind of illumination positioning methods of copper-clad ceramic substrate, it is related to semiconductor processing, to solve the problem of poor surface feature recognition effect of copper-clad ceramic substrate, its technical solution main points are: using illumination light source to light the workpiece being processed;CCD camera real-time shooting workpiece surface image being processed;From the workpiece surface image being processed, extract positioning feature, and compare positioning feature with preset positioning parameter, and real-time adjustment laser processing equipment is dynamically adjusted until it meets the set requirement;Carry out laser processing;Illumination light source includes white light source, red light source and blue light source;The white light source, red light source and blue light source continuously alternate light emission, CCD camera real-time extraction in white light source, red light source, blue light source irradiation workpiece surface image and carry out accurate identification, completely extract the whole feature required to be extracted on workpiece surface.The illumination positioning mode of copper-clad ceramic substrate of the application can accurately identify workpiece surface feature with high efficiency.

Description

Technical Field

[0001] This invention relates to the field of copper-clad ceramic substrate processing, and more specifically, to a method for positioning illumination on a copper-clad ceramic substrate. Background Technology

[0002] Copper-clad ceramic substrates (DBC substrates) are a type of electronic base material made by directly sintering copper foil onto a ceramic surface using DBC (Direct Bond Copper) technology. Copper-clad ceramic substrates possess excellent thermal cycling properties, shape stability, high rigidity, high thermal conductivity, and high reliability. Various patterns can be etched onto the copper-clad surface. Furthermore, it is a pollution-free and environmentally friendly product with a wide operating temperature range, from -55℃ to 850℃, and its coefficient of thermal expansion is close to that of silicon, making it suitable for a wide range of applications.

[0003] In the manufacturing process of copper-clad ceramic substrates, the etched patterned products are usually cut into separate boards using a laser. During laser cutting, a CCD camera is first used to identify and position the copper-clad ceramic substrate. However, due to the thickness of the copper, the surface roughness of the copper-clad ceramic substrate products (DCB / AMB) is uneven during the manufacturing process, resulting in poor surface recognition. This frequently leads to problems such as low matching scores or mismatches that prevent further processing. The original method used red light sources (wavelength 600-800nm) or blue light sources (wavelength 400-500nm), but because wet DCB has a large surface roughness (Ra: 0.5-0.8; Rz: 1.5-2.5; Rmax: 5-15), the reflectivity of the product to existing red and blue light differs, causing some pits on the product surface to be unshielded. Due to the large grain size difference (100-1000 micrometers) in AMB products, the matching between blue and red light sources is poor, resulting in frequent errors during the production process. Existing technologies also use white light sources (400-800 nm), which can cover a wider range and can more effectively deal with products with large differences. The effect is slightly better than red or blue light sources, but the improvement in recognition effect is still not significant enough, and matching errors still occur.

[0004] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an illumination positioning method for copper-clad ceramic substrates. By alternating the emission of red, blue, and white light sources, the method facilitates the extraction of workpiece surface features by a CCD camera, thereby improving the efficiency of surface feature recognition.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an illumination positioning method for a copper-clad ceramic substrate, comprising the following steps: A. Illuminating the workpiece to be processed using an illumination source; B. Taking real-time images of the surface of the workpiece to be processed using a CCD camera; C. Extracting positioning features from the surface images of the workpiece to be processed, comparing the positioning features with preset positioning parameters, and dynamically adjusting the laser processing equipment in real time until the set requirements are met; D. Performing laser processing.

[0007] In step A, the illumination source includes a white light source, a red light source, and a blue light source; the white light source, the red light source, and the blue light source emit light continuously and alternately; the CCD camera extracts the surface image of the workpiece under the illumination of the white light source, the red light source, and the blue light source in real time and performs accurate identification until all the features that need to be extracted from the surface of the workpiece are completely extracted; the CCD camera merges several photos taken to obtain the final positioning information.

[0008] By adopting the above technical solution, in the traditional copper-clad ceramic substrate processing, red, blue, or white light sources are usually used to illuminate the workpiece. Then, a CCD camera captures images of the workpiece to identify its surface positioning features, and the laser position is adjusted according to the positioning parameters for processing. However, sometimes the features cannot be identified, requiring manual intervention. The reason for this is that the workpiece surface has a high roughness, and the light cannot reveal all the features so that they can be captured by the CCD camera. Therefore, now red, blue, and white light sources are all set as illumination sources and emitted alternately. The CCD camera performs feature recognition under the illumination of the three light sources, which can basically match all the positioning features on the workpiece surface, thus facilitating laser processing.

[0009] The present invention is further configured such that: the lighting source is connected to a drive motor for driving the lighting source to automatically adjust its illumination angle.

[0010] By adopting the above technical solution, the lighting source is connected to the drive motor to drive the lighting source to adjust the illumination angle. This is to enable the light illuminating the surface of the workpiece to be reflected in more directions, thereby making it easier for the CCD camera to better identify its surface features and improve the recognition efficiency.

[0011] The present invention is further configured such that: the drive motor has at least three gears, and the illumination angle of the light source on the workpiece is different when the light source is in each gear.

[0012] By adopting the above technical solution, the drive motor is set with at least three speeds, or more speeds, depending on the complexity of the product to be processed. The tilt angle of the lighting source corresponding to each speed is different, so the illumination angle of the workpiece is also different. This ensures that the light reflected from each positioning feature of the workpiece will be reflected under different lighting angles and thus be recognized by the CCD camera. Because the CCD will take pictures and extract the surface features of the workpiece at each speed, the CCD will finally identify and compare the captured surface features of the workpiece and select the clearest positioning information.

[0013] The present invention is further configured such that the gear of the drive motor automatically switches during operation. Each time it switches to a gear, the white light source, red light source and blue light source will automatically take turns illuminating, while the CCD camera takes pictures and recognizes them until the system determines that all the positioning features of the workpiece surface have been extracted.

[0014] By adopting the above technical solution, when illuminating the workpiece, the drive motor automatically switches gears. Each time it switches to a gear, the white, red, and blue light sources will automatically illuminate in turn, that is, the white, red, and blue light sources will be illuminated in sequence. The illumination time of each light source can be customized, as long as it is ensured that the CCD camera can capture and recognize under the current light source illumination. It can usually be set to 1-2 seconds. When each light source illuminates, the CCD camera will recognize the features on the workpiece surface. If the corresponding features are not fully recognized in a gear, it will automatically switch to the next gear and continue to illuminate in turn until the CCD camera has fully recognized the positioning features. Then, the drive motor will reset to the initial position to wait for the next illumination positioning.

[0015] The present invention is further configured such that the lighting source is configured as a concave annular structure.

[0016] The main reason for using the above technical solution to set the lighting source as a concave ring structure is to avoid the generation of shadows by illumination.

[0017] The present invention is further configured such that the concave angle of the lighting source is 60°-70°.

[0018] By adopting the above technical solution, the concave angle of the lighting source is set to 60°-70° so that the internal LED light strip can be illuminated at a certain angle, and the light reflection effect is optimal under this angle of illumination.

[0019] The present invention is further configured such that: the lighting source includes a lampshade and an LED light strip, and an elastic connector is provided between the LED light strip and the lampshade.

[0020] By adopting the above technical solution, the lighting source mainly includes a lampshade and an LED light strip, which are connected by an elastic connector. The elastic connector can be a miniature spring or a soft sponge, so that the LED light strip can have a small elastic movement space and change the angle of the LED light strip within a small range, thereby causing more light reflection on the surface of the workpiece, which is convenient for CCD camera to perform feature recognition.

[0021] The present invention is further configured such that: the lighting source has a light regulator for automatically adjusting the intensity of the lighting source.

[0022] By adopting the above technical solution, the lighting source is equipped with a light regulator to adjust the light intensity of the lighting source. When each light source illuminates, different light intensities can be used to increase the intensity of reflected light on the surface features of the workpiece, which makes it easier for the CCD camera to perform feature recognition.

[0023] The present invention is further configured such that: when the lighting source is in any position, the blue light source first emits light, and the light intensity changes from weak to strong, then automatically switches to the red light source, and the light intensity changes from weak to strong again, then automatically switches to the white light source, and the light intensity changes from weak to strong again. After that, the lighting source automatically switches to another position, and the above lighting source change steps are repeated. During this period, the CCD camera continues to work to capture the surface features of the workpiece until all the features that need to be extracted from the surface of the workpiece are extracted, and the lighting source is reset to prepare for the next illumination.

[0024] By adopting the above technical solution, when it is necessary to extract features from a workpiece by illumination, white light, red light, and blue light are used for a fixed period of time at each level. During the illumination of each light source, the light intensity is automatically adjusted from weak to strong, and the CCD camera recognizes and takes pictures until all the features of the required workpiece surface are captured, which is considered an effective shot. After the shot is completed, the illumination light source is reset to prepare for the next shot. In this way, the color, angle, and light intensity of the light source are continuously adjusted during the shooting process, so that the CCD camera can capture more workpiece surface features. By intelligently recognizing and merging several photos taken by the CCD camera, the illumination positioning function can be achieved faster and better.

[0025] The present invention is further configured such that when the lighting source switches gears, the LED light strip can vibrate under the action of the elastic connector.

[0026] By adopting the above technical solution, the position of the lighting source changes when switching gears. When this dynamic change occurs, the LED light strip is connected by an elastic connector. As the position changes, the LED light strip has inertia, which causes it to vibrate slightly under the action of the elastic connector. When vibrating, the light emitted by the LED light strip will reflect light at more angles when it hits the surface of the workpiece, which makes it easier for the CCD camera to extract the surface features of the workpiece. This can improve the recognition efficiency of the CCD camera.

[0027] In summary, the present invention has the following beneficial effects: By alternately illuminating the workpiece with white, red, and blue light sources, and performing feature recognition by the CCD camera during the illumination period, the recognition efficiency is improved. Furthermore, by setting different light levels to adjust the illumination angle of the light source, more of the various features on the workpiece surface reflect light, allowing the CCD camera to capture the workpiece surface features more comprehensively. Simultaneously, the light intensity of the light source can be automatically adjusted, enabling the positioning features on the workpiece surface to reflect their features to the CCD camera under different light intensities, thus improving the CCD camera's recognition efficiency. Additionally, when the light source level is changed, the LED light strip can slightly sway through the elastic connector, allowing the workpiece surface to reflect light at different angles more accurately. This allows the CCD camera to collect the reflected light from the workpiece to the maximum extent, thereby improving the CCD camera's recognition efficiency. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the embodiments.

[0029] A method for illuminating and positioning a copper-clad ceramic substrate includes the following steps: A. Illuminating the workpiece using a light source; B. Taking real-time images of the workpiece surface using a CCD camera; C. Extracting positioning features from the workpiece surface images, comparing the positioning features with preset positioning parameters, and dynamically adjusting the laser processing equipment in real time until the set requirements are met; D. Performing laser processing; In step A, the light source includes a white light source, a red light source, and a blue light source; the white light source, red light source, and blue light source emit light alternately and continuously; the CCD camera extracts real-time images of the workpiece surface under the illumination of the white light source, red light source, and blue light source and performs accurate identification until all the features required to be extracted from the workpiece surface are completely extracted; the CCD camera merges several captured images to obtain the final positioning information. In the traditional processing of copper-clad ceramic substrates, red, blue, or white light sources are typically used to illuminate the workpiece. A CCD camera then captures images of the workpiece to identify its surface positioning features, and the laser position is adjusted accordingly. However, sometimes the features cannot be identified, requiring manual intervention. This is because the workpiece surface has a high roughness, and the light cannot fully reveal all the features that the CCD camera can capture. Therefore, red, blue, and white light sources are now used as illumination sources, emitting light alternately. The CCD camera performs feature recognition under all three light sources, which can essentially match all the positioning features on the workpiece surface, thus facilitating laser processing.

[0030] The lighting source is connected to a drive motor to automatically adjust its illumination angle. Connecting the lighting source to the drive motor to adjust the illumination angle is to allow the light illuminating the workpiece surface to be reflected in more directions, thus making it easier for the CCD camera to identify its surface features and improving recognition efficiency.

[0031] The drive motor has at least three speed settings, and the illumination angle between the light source and the workpiece is different in each speed setting; alternatively, more speed settings can be set according to the complexity of the product to be processed. The tilt angle of the light source corresponding to each speed setting is different, thus the illumination angle on the workpiece is also different. This ensures that the light reflected from each positioning feature of the workpiece will be reflected under different lighting angles and thus be recognized by the CCD camera. Because the CCD camera will take pictures to extract the surface features of the workpiece in each speed setting, the CCD camera will identify and compare the captured surface features of the workpiece and select the clearest positioning information. Furthermore, the speed settings of the drive motor automatically switch during operation. When switching to a speed setting, the white light source, red light source, and blue light source will automatically illuminate in turn, while the CCD camera takes pictures for recognition and performs image merging and recognition processing until the system determines that all positioning features of the workpiece surface have been extracted.

[0032] When illuminating a workpiece, the drive motor automatically switches gears. Each time it switches to a gear, white, red, and blue light sources illuminate the workpiece in turn, sequentially. The illumination time for each light source can be customized, ensuring the CCD camera can capture and recognize images under the current light source; typically, 1-2 seconds is sufficient. During each illumination, the CCD camera identifies features on the workpiece surface. If not all features are identified in a given gear, the system automatically switches to the next gear and continues illuminating in turn until the CCD camera has identified all the positioning features. Only then does the drive motor return to its initial position to await the next illumination positioning. Furthermore, the illumination source can be set to a concave ring structure to avoid shadows. The concave angle of the illumination source is 60°-70°, allowing the internal LED strips to illuminate at a specific angle, resulting in optimal light reflection.

[0033] The lighting source includes a lampshade and an LED light strip. The LED light strip and the lampshade are connected by an elastic connector, which can be a miniature spring or a soft sponge. This allows the LED light strip to have a small range of elastic movement, changing its angle within a small range, thereby generating more light reflection on the workpiece surface and facilitating feature recognition by the CCD camera.

[0034] The lighting source has a light regulator for automatically adjusting the intensity of the lighting source. By setting the lighting source with a light regulator to adjust the light intensity of the lighting source, different light intensities can be applied to each light source to improve the reflected light intensity of the workpiece surface features, which is more convenient for CCD cameras to perform feature recognition.

[0035] When the lighting source is at any level, the blue light source first emits light, with the intensity gradually increasing. Then it automatically switches to the red light source, again with the intensity gradually increasing. Next, it automatically switches to the white light source, again with the intensity gradually increasing. This process repeats until all the required features are extracted. The lighting source then resets to prepare for the next illumination cycle. This ensures that the white, red, and blue light sources illuminate the workpiece for a fixed period at each level, with the intensity automatically adjusting from weak to strong during each illumination. The CCD camera then identifies and captures the images until all the desired features of the workpiece surface are captured, constituting one effective image capture. The lighting source is then reset to prepare for the next shot. During the shooting process, the color angle and intensity of the light source are continuously adjusted, allowing the CCD camera to clearly and comprehensively capture the surface features of the workpiece. The CCD camera intelligently recognizes and merges multiple captured images, enabling faster and better lighting positioning. Simultaneously, when the lighting source switches modes, the LED strip vibrates under the action of the elastic connector, causing the position of the lighting source to change. During this dynamic change, the LED strip, due to its inertia, vibrates slightly under the action of the elastic connector. This vibration causes the light emitted by the LED strip to reflect at more angles when it hits the workpiece surface, making it easier for the CCD camera to extract the workpiece's surface features, thus improving the CCD camera's recognition efficiency.

[0036] In summary, by alternately illuminating the workpiece with white, red, and blue light sources, and having the CCD camera perform feature recognition during the illumination period, recognition efficiency is improved. Furthermore, by adjusting the illumination angle of the light source through setting different intensity levels, more light is reflected from various features on the workpiece surface, allowing the CCD camera to capture more comprehensive images of the workpiece surface features. Simultaneously, the automatic adjustment of the light intensity allows the workpiece surface's positioning features to reflect their characteristics to the CCD camera under different light intensities, further improving the CCD camera's recognition efficiency. Additionally, when the light source intensity is changed, the LED light strip allows for slight movement via a flexible connector, enabling the workpiece surface to reflect light at different angles more accurately. This allows the CCD camera to collect the reflected light from the workpiece to the maximum extent, thereby improving the CCD camera's recognition efficiency.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method of lighting positioning of a copper clad ceramic substrate, characterized by: Includes the following steps: A. Illuminate the workpiece using a light source; B. A CCD camera captures real-time images of the surface of the workpiece being processed; C. Extract positioning features from the surface image of the workpiece, compare the positioning features with the preset positioning parameters, and dynamically adjust the laser processing equipment in real time until the set requirements are met; D. Perform laser processing; In step A, the illumination source includes a white light source, a red light source, and a blue light source; the white light source, the red light source, and the blue light source emit light continuously and alternately, and the CCD camera extracts the surface image of the workpiece under the illumination of the white light source, the red light source, and the blue light source in real time and performs accurate identification until all the features that need to be extracted from the surface of the workpiece are completely extracted. The CCD camera merges several photos to obtain the final positioning information. The lighting source includes a lampshade and an LED light strip, and an elastic connector is provided between the LED light strip and the lampshade; The lighting source has a light regulator for automatically adjusting the intensity of the lighting source; The lighting source is connected to a drive motor to automatically adjust the illumination angle of the lighting source. When the lighting source is in any position, the blue light source first emits light, and the light intensity changes from weak to strong. Then it automatically switches to the red light source, and the light intensity changes from weak to strong again. Then it automatically switches to the white light source, and the light intensity changes from weak to strong again. After that, the lighting source automatically switches to another position and goes through the above lighting source change steps again. During this period, the CCD camera continues to work and capture the surface features of the workpiece until all the features that need to be extracted from the surface of the workpiece are extracted. The lighting source is then reset to prepare for the next illumination. When the lighting source switches gears, the LED light strip can vibrate under the action of the elastic connector.

2. The method of claim 1, wherein the method further comprises: The drive motor has at least three speed settings, and the illumination angle of the light source on the workpiece is different when the light source is in each speed setting.

3. The method of claim 2, wherein the method further comprises: The drive motor automatically switches gears during operation. Each time it switches to a gear, the white light source, red light source, and blue light source will automatically take turns illuminating the workpiece, while the CCD camera takes pictures and recognizes them until the system determines that all the positioning features on the workpiece surface have been extracted.

4. The illumination positioning method for a copper-clad ceramic substrate according to claim 1, characterized in that: The lighting source is configured as a concave annular structure.

5. The illumination positioning method for a copper-clad ceramic substrate according to claim 4, characterized in that: The concave angle of the lighting source is 60°-70°.