Page 146 - PCMI Journal December 2020
P. 146
Dry Film Resist Control Topics in Photo Chemical Milling Processes Presented by: Sean Hill, Project Manager | Eternal Technology Corporation, US 12/18/20
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Advantages § Lower cost
§ Greater Light Intensity
§ Less sensitive to dust and
debris
Flood Light
Disadvantages
§ Less capable of producing fine line features
§ Light enters the frame at varying angles and may distort the circuit features
§ Inconsistent Light intensity at frame edge
Limiting Feature Resolution: 3 to 4 Mil range
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Collimated Light
Unexposed
Metal Substate
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Issue 136 December 2020 PCMI Journal 146
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