Thin film resistor laser automatic repairing and engraving machine

Abstract

The invention discloses an automatic laser trimmer for thin-film resistors. The automatic laser trimmer for thin-film resistors comprises a rack, an automatic workpiece loading and unloading device, an automatic workpiece lifting device, a workpiece outlet, an automatic focusing laser device, a trimming table, an electric brush lifting mechanism, an industrial personal computer with a resistance automatic detection system, display, input and output equipment, and an air pump, wherein the rack is used as a supporting structure and a shell of the automatic laser trimmer for thin-film resistors; the automatic focusing laser device is arranged on a suspension of the rack; and the industrial personal computer with the resistance automatic detection system is arranged on a platform of the rack. The height of the laser gathering plane and the height of the plane of a machined film resistor are made to be coincident through an automatic focusing lens, the laser machining accuracy and efficiency are improved, efficient and accurate trimming is ensured, and the trimming accuracy of the trimmer can reach more than 0.1%.

Description

technical field [0001] The invention relates to a special equipment for automatic adjustment of the resistance value of thin film resistors, in particular to a full-automatic resistance resistance modification and engraving machine based on various technologies such as laser, pneumatic and single-chip microcomputer. Background technique [0002] High-precision conductive plastic angular displacement sensors are widely used in petroleum, chemical industry, machinery, aerospace, military and other occasions that require angle control. Its core technology is the precise trimming of membrane resistance. At present, in terms of film resistance repairing technology, there are mainly two types: contact repairing and non-contact repairing. The contact repairing technology uses the cutting effect of the tool on the resistance material to achieve repairing, and the efficiency is low. The non-contact repairing mainly utilizes the instantaneous heating of the resistance material by the ...

AI Technical Summary

Problems solved by technology

Although some units have successfully developed an experimental CNC automatic repairing system in scientific research, such as the XK35H-2 conductive plastic resistive sensor developed and produced by Shanghai Haoguang Resistive Sensor Co., Ltd. (formerly Shanghai Haoguang Technology Industry and Trade Co., Ltd.) The automatic repairing and engraving machine is used for the repairing and engraving of the plastic-guided angular displacement resistive sensor, which can repair and engrave the linearity accuracy of the angular displacement resistive sensor to about 0.5% in a short period of time, and the highest can reach 0.2%; Guangzhou Kang The KLD 1000 trimming machine of Toli Computer Technology Co., Ltd. can modify the linearity of the resistive sensor to 0.5%, but it is still in the stage of technical confidentiality and experimental nature, and no reliable information can be found in the public information

[0004] There are also researches on laser repair and engraving in China. For example, a research institute of the Academy of Physics of the Chinese Academy of Sciences has carried out relevant experimental research on laser repair and engraving technology of carbon film resistive sensors, and has trial-produced a laser repair and engraving machine, but the effect is not satisfactory. , the accuracy achieved is relatively limited, and there are many side effects, such as damage to the carbon film and insulating substrate, etc.

The reason is that the focal length of the laser is not easy to adjust accurately, and inaccurate focus and power control can easily cause heat burns during laser processing

Moreover, the current existing laser repairing and engraving machines generally have shortcomings such as low degree of automation, poor adaptability, and low repairing and engraving efficiency.

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