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Laser fine fusion covering device for local short circuit of wire wound potentiometer

A local short circuit and potentiometer technology, applied in the direction of circuits, resistors, wound resistance components, etc., can solve the problems of ineffective guarantee of dimensional accuracy, low yield rate, high bonding strength, etc., and the short circuit range can be precisely controlled and short circuited The effect of high positioning accuracy

Inactive Publication Date: 2008-12-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is characterized by simple process and low equipment cost. The disadvantage is that it is difficult to locate the parts that need short circuit, and the dimensional accuracy cannot be effectively guaranteed;
In this technology, the bonding strength between the metal sheet and the resistance wire is high, but the disadvantage is that the laser beam easily penetrates the metal sheet and burns the resistance wire, so the processing yield is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The diameter of the potentiometer winding skeleton is φ14mm, the diameter of the resistance wire is φ0.02mm, and the pitch of each turn is 0.02mm. First, use alcohol to clean the part of the winding of the wire-wound potentiometer that needs to be short-circuited, and then use a scraper or a micro-nozzle to pre-set the conductor paste at both ends of the winding. In the used conductive paste, flake Ag powder with a thickness of 5-8 μm is selected, and the content is 70%. Dry the above-mentioned windings to volatilize the organic solvent in the conductive paste. Use the laser beam to scan the surface of the above-mentioned conductive paste coating according to the predetermined trajectory of the program. The processing arc is 40°, and the intermediate gap is 5°, so that the bonding phase in the conductive paste is solidified; the average output power of the laser is 50W Nd:YAG , the laser spot diameter is 0.02mm, and the actual power used during laser processing is 30W....

Embodiment 2

[0021] Conductor paste, potentiometer winding and laser are as in Example 1. The laser beam is used to scan the surface of the above-mentioned conductor paste coating according to the predetermined trajectory of the program. The processing arc is 6°, located in the middle of the winding, and the obtained fine cladding The layer has good electrical conductivity, accurate short-circuit range, glossy surface, no pores and other defects, and is resistant to friction, which can well realize the function of short-circuiting the resistor in a certain area.

Embodiment 3

[0023] Conductor paste and potentiometer winding are as in Example 1, the winding is located at the laser focus, and the pulse output Nd:YAG lamp is used to pump the solid-state laser, and the maximum average power of the laser is 120W. During laser processing, the average output power is 65W, the pulse width is 10ms, and the table speed is 50mm / s. The short circuit produced has good electrical conductivity, surface gloss, no pores, cracks and other defects, and has good friction resistance and shock resistance. , can well realize the short-circuit function of the resistor in a certain area.

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PUM

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Abstract

This invention discloses a laser fine melting method making short-circuit to part of wire-wound potentiometers including: 1, cleaning the part of the potentiometer needing to be short-circuited, 2, putting a conductor slurry on the short-circuit part and burying it, in which, the size of the metal powder of the slurry is less than or equal to 20mum, 3, drying the winding to volatilize the organic solvent, 4, scanning the surface of the slurry by laser beams to solidify the felt phase, when using a continuous laser, the facula diameter is 20-100mum, the laser power is 1-50W and the laser scanning speed is 1mm / s-50mm / s, when using a pulse laser, the laser power is 10-120W, the pulse width is 1-20mms and the scanning speed is 1-50mm / s, 5, cleaning the residual conductor slurry that is not radiated by laser.

Description

technical field [0001] The invention belongs to the fields of potentiometer production and laser micromachining technology, and specifically relates to a laser micro-cladding method for partially short-circuiting a wire-wound potentiometer. The laser micro-cladding technology is used to adjust the resistance of the wire-wound potentiometer. Background technique [0002] Potentiometers are simple and general-purpose electromechanical components that are widely used in technical fields such as control systems, instruments, electronic equipment, electrical measuring devices, and electronic computers. [0003] Any potentiometer has five basic parts: the resistive element, the termination method, the contacts or brushes, the drive mechanism or shaft, and the housing or housing. The core of the potentiometer is the resistive element, which has some influence on all the electrical parameters of the potentiometer. Resistive elements are usually divided into two categories: wire-wou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C17/242H01C17/04
Inventor 曾晓雁李祥友蔡志祥
Owner HUAZHONG UNIV OF SCI & TECH