SU1627834A1 - Device for testing the quality of printed circuit board vias metal plating - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used in determining the quality of metallurgy in the electronic industry. The aim of the invention is to verify the authenticity of the control by finding and fixing the actual center of the hole. Initially, using the stepper motors 15 and 16 and registering the illumination of the measuring head 7, the maximum illumination value is determined and corresponds to the coincidence of the center of the hole with the optical axis of the measuring head 7. Then, the intensity of the signal from the central illuminator is broken into the metallization thickness of the hole. After this, the side illuminators are turned on and the illumination determined by reflection is recorded from the walls of the opening. Values; This illumination is a measure of the quality of the metallization of the hole. 1 hp ff, 2 ill. 16 о а СО о N3 OS with Jb

Description

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31627834

- The invention relates to instrumentation technology and can be used in determining the quality of the metallization of holes in the electronic industry.

The aim of the invention is to increase the reliability of control by searching for and fixing the actual center of the hole.

FIG. 1 shows a block diagram of the proposed device in figure 2 - the design of the measuring head. The device (figure 1) contains successively connected generator of 1 clock pulses, circuit 2 coincidence, counter 3, decoder 4, bottom KJi 0-ifi b and ti, measuring, head 7, photo amplifier 8, analog-digital converter 9, the second input of which The coincidence circuit 2 is connected to the output, and the controller 10, the outputs of which are connected to the second inputs of the counter 3 of the circuit 2, shows that the device contains a formation, 11, connected between the third output of the decoder 4 and the controller input 10, the hole center search unit 12, which is turned on between out the home of the measuring head 7 and the controller 10, two control units 13 and 14 connected to the outputs of the controller 10 and the hole center search unit 12, two stepper motors 15 and 16 connected to the corresponding control blocks 13 and 14, and the coordinate table 17 installed with TRAY moving by stepper motors 15 and 16 in orthogonal directions. In addition, in FIG. 1 shows a controlled printed circuit board 18 with a hole 19.

The R sopat of the measuring head 7 enters (Fig. 2) the base 20, the optical illumination system 21, the spring 22 connecting the optical illumination system 21 with the base 20, the photodetector system 22 and the spring 23 connecting the photodetector system 22 with the base 20. Optical the lighting system 21 comprises a housing 24, a central illuminator 25, lateral illuminators 26 and 27, and a condenser 28 are located in the camera. The photoreception system 22 includes a housing 29, in which

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The optical lighting systems 21 and the photodetector system are installed coaxially on opposite sides of the printed circuit board 18. The controller 10 in accordance with the program using blocks 13 and 14 on the board and stepper motors 15 and 16 moves the coordinate table 17 with the printed circuit board 18 to control the hole 19 After the end of the movement, the center of the hole center search 12 is switched on, which anapogically moves the coordinate table 17 until the center of the hole 19 coincides with the optical axis of the measuring head 7.

Upon completion of the center search, the scroller 10 opens the circuit 2 coincides and the pulses from the generator 1 of the pulses arrive at the counter 3, the state of which is decrypted by the decoder 4. R according to the decoder 4 includes the keys 5 and 6, including the central or side illuminators 25-27. The intensity of the light beam is converted by the photosensitive element 31 into an electrical signal and after amplifying the photo amplifier 8 and digitizing the analog-digital converter 9 enters the controller 10. The intensity of the aperture 25 is calculated from the intensity of the link signal 25 and the intensity of the signal is calculated from from side illuminators 26 and 27 about the presence of a defect of metallization.

At the end of the measurements, Lormirovan 11 generates a pulse at the end of the measurements.

Claims (1)

Invention Formula one . A device for controlling the quality of the metallization of the holes in printed circuit boards contains a measuring head, a serially connected controller, both a control unit and two step motors and a coordinate station connected to stepper motors, characterized in that, in order to increase the control accuracy, it is equipped with a block placed the lens 30 and the photo-search center of the hole, included 0 five 0 five 0 five 0 The optical lighting system 21 and the photodetector system are installed coaxially on opposite sides of the monitored circuit board 18. The controller 10, in accordance with the program, uses the control units 13 and 14 and the stepper motors 15 and 16 moves the coordinate table 17 with the circuit board 18 to control the opening 19. After The end of the movement includes the hole center search unit 12, which anapogically moves the coordinate table 17 until the center of the hole 19 coincides with the optical axis of the measuring head 7. Upon completion of the center search, the controller 10 opens the coincidence circuit 2 and the pulses from the clock pulse generator 1 are fed to a counter 3, the state of which is decoded by the decoder 4. R according to the state of the decoder 4, keys 5 and 6 are turned on, including central or side lights respectively 27. The intensity of the light beam is converted into an electrical signal by the photosensitive element 31 and, after the photo amplifier 8 is amplified and the analog-digital converter 9 is digitized, is fed to the controller 10. The intensity of the light signal from the central illuminator 25 is calculated by the intensity of the light signal 26, and by the intensity of the signal from the side illuminators 26 and 27 on the presence of a metallization defect. At the end of the measurements, Lormirogel 11 forms a pulse of the end of the measurements. Invention Formula one . A device for monitoring the quality of the metallization of the openings of printed circuit boards, containing a measuring head, a serially connected controller, both a control unit and two stepper motors and a coordinate table connected to stepper motors, characterized in that it is equipped with a center search unit to increase the accuracy of the control. holes included positive element 31. The device works as follows. between the output of the measuring head and the inputs of the controller and control units, sequentially connecting. Z