T H E P H O T O - M A S K G U I D E JD Photo-Tools Page 25 of 91 Tolerances & Resolutions Resolutions Our Chrome photomask writers work on different classes – with each class having a different resolution that is capable of imaging smaller features. Class 4...
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T H E P H O T O - M A S K G U I D E JD Photo-Tools Page 25 of 91 Tolerances & Resolutions Resolutions Our Chrome photomask writers work on different classes – with each class having a different resolution that is capable of imaging smaller features. Class 4 is the highest resolution, and therefore gives the best quality. Each resolution has different tolerances – both dimensionally across the plate and also feature tolerances. Each resolution also has its own grid addressability. Due to these factors, we do not recommend mixing different class if they are part of the same mask set that must align perfectly together. Our Film Imagers are capable of imaging at 4 different resolutions: 16,000 dpi, 32,000 dpi, 64,000 dpi and 128,000 dpi, which we refer to as Grade1 – 4 with 4 being the highest resolution. We also have other imaging equipment that is capable of lower resolutions (from 2000 dpi upwards), although these very low resolutions would never be suitable for fine line photo-masks. T
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