Online backlight tester

Abstract

The invention relates to an online backlight tester, which is mainly used for hole backlight testing of a horizontal copper deposition wire and comprises a machine table, a backlight testing mechanism arranged on the machine table, a line roller conveying mechanism for conveying a PCB (Printed Circuit Board) to be detected and a control unit, the backlight testing mechanism comprises an X-ray generating assembly used for emitting X-rays towards the PCB to be detected and an X-ray receiving assembly used for receiving the X-rays generated by the X-ray generating assembly. The control unit is electrically connected to the line roller conveying mechanism, the X-ray generating assembly and the X-ray receiving assembly so as to control the line roller conveying mechanism, the X-ray generating assembly and the X-ray receiving assembly. The hole metallization image is reconstructed in an X-ray mode, the purpose of detecting the backlight quality is achieved, the situation that manual backlight detection needs to be conducted on the basis that a PCB is damaged in the prior art is avoided, the PCB does not need to be damaged, the quality of the PCB is stable, automatic feeding is achieved, and the testing efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of online backlight tester technology, and in particular to an online backlight tester. Background Technology

[0002] Since the 1960s, the printed circuit board (PCB) industry has used hole metallization and electroplating technologies to solve the problem of interlayer connection or conductivity. Electroplating is the most basic and critical step in PCB production, directly affecting the electrical performance and reliability of the PCB product. Electroplating is complex and prone to various quality problems. Based on the two basic purposes of electroplating—hole metallization to achieve conductivity between different layers and thickening of the copper on the board surface—the thickness of the copper inside the hole and the surface copper is a key technical indicator and an important control point, relating to whether the preset current and signal transmission requirements can be met.

[0003] Traditionally, the thickness testing of copper in printed circuit board (PCB) holes and surface copper involves manual analysis using specialized measuring instruments such as microscopes. The specific method involves cutting several products from the PCB after copper plating, placing them in liquid epoxy resin with a catalyst and curing agent, and then grinding and polishing the cross-sections after solidification. The thickness of the coating layer is then measured using a metallographic microscope. This manual measurement method suffers from slow sampling speed and low measurement efficiency. Furthermore, the aforementioned testing methods are destructive to products and have a limited range of testable product types, making it impossible to inspect all products. These methods also cannot identify issues such as localized cracks and voids, leading to compromised production quality of printed circuit boards. Therefore, providing a non-destructive testing method for copper-hole backlighting has become a pressing issue in the industry.

[0004] Therefore, in this patent application, the applicant has carefully researched an online backlight tester to solve the above problems. Summary of the Invention

[0005] The present invention addresses the shortcomings of the prior art by providing an online backlight tester that reconstructs the metallized image of the hole using X-rays to detect backlight quality. This avoids the need for manual backlight testing on a damaged PCB board, eliminates the need to damage the PCB board, ensures stable PCB board quality, and features automated feeding, greatly improving testing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An online backlight tester, mainly used for backlight testing of holes in horizontal copper plating lines, includes an organic stage, a backlight testing mechanism set on the machine stage, a roller conveyor mechanism for conveying the PCB to be tested, and a control unit. The backlight testing mechanism includes an X-ray generating component for emitting X-rays toward the PCB to be tested and an X-ray receiving component for receiving the X-rays generated by the X-ray generating component. The control unit is electrically connected to the roller conveyor mechanism, the X-ray generating component and the X-ray receiving component to control the roller conveyor mechanism, the X-ray generating component and the X-ray receiving component.

[0007] As a preferred embodiment, the control unit includes a main controller mounted on the machine platform, a computer host, a support frame suspended above the roller conveyor mechanism, a placement plate mounted on the support frame for placing a keyboard and mouse, a display screen mounted on the placement plate, a keyboard and mouse, the keyboard and mouse being electrically connected to the computer host, the main controller being electrically connected to the roller conveyor mechanism and the X-ray generating component, and the X-ray receiving component being connected to the computer host.

[0008] As a preferred embodiment, the X-ray generating assembly includes an X-ray generator, an X-ray path, and a rotating mirror arranged sequentially. The X-rays generated by the X-ray generator are reflected by the X-ray path and the rotating mirror to the X-ray receiving assembly.

[0009] As a preferred embodiment, the rotating reflector is a rotating reflector with a micro motor, and the rotating reflector with the micro motor is electrically connected to the control unit.

[0010] As a preferred embodiment, the X-ray generating assembly further includes an accordion-type drive mechanism for driving the rotating mirror to reciprocate in the left-right direction, the accordion-type drive mechanism being electrically connected to the computer host.

[0011] As a preferred embodiment, the backlight testing mechanism further includes a detachable frame mounted on the machine base, and the X-ray generating component is mounted on the frame.

[0012] As a preferred embodiment, the machine is provided with an X-ray transmission slot, and the X-ray receiving component is located inside the machine. The X-rays generated by the X-ray generating component pass through the X-ray transmission slot and are received by the X-ray receiving component.

[0013] As a preferred embodiment, it also includes a CCD positioning device, and the accordion-type drive mechanism is also used to drive the CCD positioning device to move back and forth in the left and right directions.

[0014] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it mainly uses the cooperation of X-ray generating components and X-ray receiving components to reconstruct the hole metallization image by X-ray, so as to achieve the purpose of detecting backlight quality. This avoids the need for manual backlight detection on the basis of damage to the PCB board, which is traditional. It does not require damage to the PCB board, the PCB board quality is stable, and the automated feeding greatly improves the testing efficiency.

[0015] To more clearly illustrate the structural features and effects of the present invention, a detailed description is provided below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a preferred embodiment of the present invention (mainly showing the X-ray transmission groove and CCD positioning device). Figure 3 This is a schematic diagram of the X-ray generating component structure according to a preferred embodiment of the present invention; Figure 4 yes Figure 3 A partial structural diagram (the optical path cover and X-ray transmission tube are not shown). Figure 5 yes Figure 4 A partial structural diagram (mainly showing the first slider, the second slider, and the electric cylinder); Figure 6 This is a partial structural diagram of the control unit of a preferred embodiment of the present invention (the main controller and computer host are not shown). Figure 7 This is a schematic diagram of the structure of an X-ray receiving assembly according to a preferred embodiment of the present invention (also showing an image processing and reconstruction device and a high-voltage generator). Figure 8 This is a schematic diagram of the structure of the roller conveyor mechanism according to a preferred embodiment of the present invention; Figure 9 This is a general control principle block diagram of a preferred embodiment of the present invention.

[0017] Explanation of icon numbers: 10. Machine platform 11. CCD positioning device; 12. X-ray transmission channel 20. Roller conveyor mechanism 21. Walking wheel 221. Drive shaft 231. Variable frequency motor; 232. Drive sprocket 233. Driven sprocket; 234. Iron chain. 24. Driving gear 25. Driven gear 31. Computer host 32. Support frame 33. Keyboard 34. Mouse 35. Placement board 36. Display screen 37. Main controller 41. Rack 421. X-ray generator 422. Rotating reflector; 423. Organ-type drive mechanism 424. Polarizer; 425. First collimator 426. Second collimator 427. Polarizer 428. Optical path cover; 429. X-ray transmission tube 43. X-ray receiving assembly 441. First slider 442. Slide rail 443. Second slider; 444. Electric cylinder 445. Accordion Cover 45. Image processing and reconstruction device 46. High voltage generator. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1 to 9 As shown, an online backlight tester is mainly used for backlight testing of holes in horizontal copper plating lines. It includes a stage 10, a backlight testing mechanism set on the stage 10, a CCD positioning device 11, a roller conveyor mechanism 20 for conveying the PCB to be tested, and a control unit.

[0020] The backlight testing mechanism includes a frame 41 detachably mounted on the machine base 10, an X-ray generating component for emitting X-rays toward the PCB to be tested, and an X-ray receiving component 43 for receiving the X-rays generated by the X-ray generating component. The control unit is electrically connected to the roller conveyor mechanism 20, the X-ray generating component, and the X-ray receiving component 43 to control the roller conveyor mechanism 20, the X-ray generating component, and the X-ray receiving component 43.

[0021] In this embodiment, the X-ray generating components are mounted on the frame 41. Preferably, there are two X-ray generating components arranged side by side, and the X-ray receiving component 43 can receive the rays generated by the two X-ray generating components.

[0022] The X-ray generating assembly includes an X-ray generator 421, an X-ray path, a rotating reflector 422, and an accordion-type drive mechanism 423 for driving the rotating reflector 422 to reciprocate in the left-right direction. The X-rays generated by the X-ray generator 421 are reflected by the X-ray path and the rotating reflector 422 to the X-ray receiving assembly 43. The X-ray generator 421 is connected to a high-voltage generator 46 for providing high voltage to it.

[0023] In this embodiment, the X-ray path sequentially includes an optical path cover 428 and a polarizer 424, a first collimator 425, a second collimator 426, and a polariscope 427 located inside the optical path cover. X-rays generated by the X-ray generator 421 enter the optical path cover 428 through the X-ray transmission tube 429.

[0024] The accordion-style drive mechanism 423 is electrically connected to the computer host 31 described below. The accordion-style drive mechanism 423 is also used to drive the CCD positioning device 11 to reciprocate along the left-right direction. In this embodiment, the accordion-style drive mechanism 423 includes a first slider 441, a slide rail 442, a second slider 443 that reciprocates along the slide rail 442, an electric cylinder 444 for driving the displacement of the first slider 441, and an accordion cover 445 disposed on the first slider 441; the rotating reflector 422 and the CCD positioning device 11 are both disposed on the second slider 443. The electric cylinder 444 is electrically connected to the main controller 37.

[0025] In this embodiment, the rotating reflector 422 is a rotating reflector 422 with a micro motor, and the rotating reflector 422 with the micro motor is electrically connected to the control unit.

[0026] The machine tool 10 is provided with an X-ray transmission slot 12, and the X-ray receiving component 43 is located inside the machine tool 10. The X-rays generated by the X-ray generating component pass through the X-ray transmission slot 12 and are received by the X-ray receiving component 43.

[0027] In this embodiment, the control unit includes a main controller 37 mounted on the machine base 10, a computer host 31, a support frame 32 suspended above the roller conveyor mechanism 20, a placement plate 35 mounted on the support frame 32 for placing a keyboard 33 and a mouse 34, a display screen 36 mounted on the placement plate 35, and the keyboard 33 and mouse 34. The keyboard 33 and mouse 34 are electrically connected to the computer host 31, and the main controller 37 is electrically connected to the roller conveyor mechanism 20 and the X-ray generating component. The computer host 31 is connected to the X-ray receiving component 43 through an image processing and reconstruction device 45. The main controller 37 is connected to a start button 381, a stop button 382, ​​and a speed adjustment button 383, all of which are mounted on the machine base 10.

[0028] In this embodiment, the roller conveying mechanism 20 includes a plurality of parallel rollers 21 for conveying PCB boards and a transmission mechanism for driving the rollers 21 to rotate. The X-ray transmission slot 12 is located below the gap between the two rollers 21.

[0029] The transmission mechanism includes a transmission shaft 221, a transmission shaft drive assembly for driving the transmission shaft 221 to rotate, a drive gear 24 mounted on the transmission shaft 221, and a driven gear 25 meshing with the drive gear 24. One end of the roller 21 is connected to the driven gear 25, and the other end of the roller 21 is rotatably connected to the machine base 10. The drive gear 24 is a 16-tooth bevel gear, and the driven gear 25 is an 11-tooth bevel gear.

[0030] The drive shaft assembly includes a variable frequency motor 231 connected to the main controller 37, a drive sprocket 232 connected to the variable frequency motor 231, a driven sprocket 233 connected to the drive shaft 221, and an iron chain 234 connecting the drive sprocket 232 and the driven sprocket 233. The variable frequency motor 231 drives the drive sprocket 232 to rotate, thereby driving the driven sprocket 233 and the drive shaft 221 to rotate, which in turn drives the roller 21 to rotate.

[0031] The key design feature of this invention is that it uses the cooperation of an X-ray generating component and an X-ray receiving component to reconstruct the metallized image of the hole using X-rays, thereby achieving the purpose of detecting backlight quality. This avoids the need for manual backlight detection on a damaged PCB board, as is the traditional method. It does not damage the PCB board, ensures stable PCB board quality, and the automated feeding greatly improves testing efficiency.

[0032] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An online backlight tester, mainly used for backlight testing of holes in horizontal copper plating lines, characterized in that: It includes an organic platform, a backlight testing mechanism set on the platform, a roller conveyor mechanism for conveying the PCB to be tested, and a control unit; The backlight testing mechanism includes an X-ray generating component for emitting X-rays toward the PCB to be tested and an X-ray receiving component for receiving the X-rays generated by the X-ray generating component. The control unit is electrically connected to the roller conveyor mechanism, the X-ray generating component and the X-ray receiving component to control the roller conveyor mechanism, the X-ray generating component and the X-ray receiving component.

2. The online backlight tester according to claim 1, characterized in that: The control unit includes a main controller mounted on the machine platform, a computer host, a support frame suspended above the roller conveyor mechanism, a placement plate on the support frame for placing a keyboard and mouse, a display screen on the placement plate, a keyboard and mouse, the keyboard and mouse being electrically connected to the computer host, the main controller being electrically connected to the roller conveyor mechanism and the X-ray generating component, and the X-ray receiving component being connected to the computer host.

3. The online backlight tester according to claim 1, characterized in that: The X-ray generating assembly includes an X-ray generator, an X-ray path, and a rotating reflector arranged in sequence. The X-rays generated by the X-ray generator are reflected to the X-ray receiving assembly through the X-ray path and the rotating reflector.

4. The online backlight tester according to claim 3, characterized in that: The rotating reflector is a rotating reflector with a micro motor, and the rotating reflector with the micro motor is electrically connected to the control unit.

5. The online backlight tester according to claim 3, characterized in that: The X-ray generating assembly also includes an accordion-style drive mechanism for driving the rotating mirror to reciprocate in the left-right direction, the accordion-style drive mechanism being electrically connected to the computer host.

6. The online backlight tester according to claim 1, characterized in that: The backlight testing mechanism also includes a detachable frame mounted on the machine platform, and the X-ray generating component is mounted on the frame.

7. The online backlight tester according to claim 1, characterized in that: The machine is equipped with an X-ray transmission slot, and the X-ray receiving component is located inside the machine. The X-rays generated by the X-ray generating component pass through the X-ray transmission slot and are received by the X-ray receiving component.

8. The online backlight tester according to claim 5, characterized in that: It also includes a CCD positioning device, and the accordion-type drive mechanism is also used to drive the CCD positioning device to move back and forth in the left and right directions.

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