Lighting is an important component of any vision recognition system. When it comes to lighting, it is not a case of “one size fits all.” The proper illumination of a given surface type requires flexibility in lighting. Variations in devices from vendor to vendor or variations in passivation (the process of treating metal in order to reduce the chemical reactivity of its surface) either glass or polyimide may require different lighting parameters. MRSI Systems’ family of die bonders and dispense systems include programmable intensity ring and collimated lighting for each camera. Optimal light settings are programmable for each die and alignment.
Programmable Multi-Color Lighting
The ring lights include multi-color lighting to optimally vision process a wide range of materials. Tri-color red, green and blue programmable lighting is more robust for processing challenging alignment surfaces, such as gold on alumina. The following pictures illustrate the point. The picture on the left shows the video image of a gold trace on white ceramic illuminated with RGB lighting. The picture on the right shows the same image using a single wavelength light source. Seeing the clarity of the image on the right it is easy to understand why MRSI systems achieve much better vision processing results than a competitive system using a single color light source.
Lighting intensity must be programmable and include both ring and collimated lights for a complete lighting solution. It must be possible to individually program optimal light settings for each die and substrate fiducial alignment.
Tri-color (red, green, and blue) stadium lighting is combined with programmable lighting intensity to enable the processing of the widest range of die, substrates and packages. Each color’s intensity is set independently, thus allowing tuning of the illumination wavelength for vision processing. This means the user can maximize the contrast in the image by optimizing the mix of colors for the package or substrate and choose a different combination for the die. This dramatically increases the capability of the vision recognition. The tri-color programmable intensity lighting solution provides robust image lighting for even difficult images such as thin gold traces on white ceramic substrates and RF package headers.
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