Production method of film circuit plate

Abstract

The present invention relates to a method for making film circuit board. Under the condition of having no wire jumper and preventing production of unknown key signal it adopts the following steps: making key position circuit and matrix arrangement, then when the film circuit board is made, firstly making PET heating preshrinking process of film circuit board, then printing circuit silver slurry on the film circuit board, then printing insulating layer or printing carbon layer on the printed circuit silver slurry, folding the film circuit board and making ultrasonic combination, punching structure holes on the film circuit board so as to obtain the product.

Description

technical field [0001] The invention relates to a manufacturing method of a thin-film circuit board, in particular to a method for arranging a key position circuit and matrix (Matrix) without jumping wires and avoiding the generation of unknown key signals, and then performing thin film according to the arranged key position and matrix. Method for making circuit boards. Background technique [0002] It is known that the keyboards used in notebook computers currently on the market also include a thin film circuit board (Membrane) in addition to the upper keys, the substrate, and the bridging bridge. When making this thin film circuit board, the manufacturer will first define and shape the button position layout, and then hand over the defined and shaped button position layout to the manufacturer for the matrix arrangement of the buttons (such as figure 1 shown), after the matrix arrangement of key positions, fill in the position code of each key in the chip. [0003] After ...

AI Technical Summary

Problems solved by technology

[0004] When making this kind of thin film circuit board with jumpers, not only are there many printing processes, but the relative production steps are complicated, which increases the production cost, reduces the relative output, and the rate of defective products is also high. The proportion of micro-short circuit is high, the reliability of the product is poor, and the printed jumper will cause uneven thickness of the thin film circuit and affect the key in (key in)

[0005] In addition, when the keyboard made by the above method is operated by the user, the microprocessor inside the keyboard will continuously scan and detect whether the key is pressed on the scanning matrix. is pressed), usually when the microprocessor scans this key combination, it will mistakenly recognize that the fourth key is also pressed (such as Figure 5 As shown), so there is an unknown key signal output, and the character string displayed on the computer display will show the state of one more character, causing inconvenience to the user

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