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Basics
Laser trimming is a way of achieving precision alteration of the attributes of an electronic circuit. A laser removes material from the appropriate component and thus adjusts its value. A lateral cut into an SMD or hybrid resistor increases its resistance. Removing part of the top electrode of a capacitor decreases its capacitance.

High precision by laser trimming
During trim process the relevant parameter is measured continuously and compared with the nominal value. The trim cut stops automatically when the target value is reached. If the parameter cannot be measured continuously the trim is done step by step. Resistance, voltage, current, frequency - with suitable measuring equipment any output parameter can be trimmed.


Concepts A laser trimming system speeds up, automates and increases the accuracy of your trim application. LS builds a system from modules, customised to your requirements, providing optimum cost and performance. LS supplies modules for integration into OEM systems or production lines, as well as complete stand-alone systems with instrumentation, prober and automated handling.

Adjustable illumination improves image quality
For component location via image processing, several adjustable monochromatic diode clusters are provided to guarantee uniform, wide area illumination. The wavelength of the light source is close to that of the laser, giving a bright sharp image over the whole working area to ensure reliable image processing. The optional coaxial illumination is ideal for highly reflective materials e.g. silicon or gold.

Software
The LS software runs under Windows. The programs can be generated flexibly in a flow chart. Simple, configurable interfaces permit the seamless integration of external systems as well as the connection to higher level host computers. Parameter and command items using configurable dialog boxes facilitate programming and reduce programming time.


	Image processing The integrated image processing provides, as an option and, in addition to the video edge sensing and the area search, a geometric model finder. Optimised search algorithms guarantee short process times. Adjustable video data enables a optimum picture of the work piece. Corrections of x, y and angular tolerances are made automatically via adjustments to the laser beam and the handling.