Circuit board drilling depth control device and method

Abstract

The invention discloses a circuit board drilling depth control device and method. A first control module generates a periodic square wave pulse signal to a main shaft; a signal acquisition unit acquires a feedback signal fed back by the main shaft when a drilling tool of a drilling machine is in contact with an electrically conductive medium of a circuit board, and outputs a detection signal to the first control module based on an adjusting signal output by an automatic adjusting unit; the first control module determines a difference value between the pulse width of the detection signal and a preset pulse width, and sends the difference value to the automatic adjusting unit; or the first control module sends the determined pulse width of the detection signal to an upper computer, so that the upper computer determines the difference value between the pulse width and the preset pulse width and sends the difference value to the first control module, and the first control module sends the difference value to the automatic adjusting unit; the automatic adjusting unit adjusts the adjusting signal according to the difference value, so that the pulse width of the detection signal is the preset pulse width; and a second control module determines a position height of the electrically conductive medium.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of circuit boards, in particular to a device and method for controlling the drilling depth of a circuit board. Background technique [0002] With the rapid development of science and technology, the integration of electronic components is getting higher and higher. PCB (Printed Circuit Board, printed circuit board) is an important carrier of large-scale integrated circuits. PCB boards of different sizes and the number of layers of PCB boards are constantly increasing. The requirements for depth control precision of blind drilling are getting higher and higher. [0003] The traditional production process uses the drill to touch the conductive medium covered on the PCB, and the detection module outputs a corresponding level trigger signal, which is sent to the control system to obtain the current position, thereby calculating the depth of the drill hole that needs to be drilled. Howe...

AI Technical Summary

Problems solved by technology

However, when the PCB board is processed in different ways, the capacitance between the conductive medium and the workbench is different, so that the pulse width of the output signal of the detection module changes

When the pulse width of the output signal is too small, the output signal will be lost; when the pulse width of the output signal is too large, the noise of the output signal will increase

Undoubtedly, this will affect the depth control accuracy of blind drilling

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