Troubleshooting: Uneven Depth in Laser-Etched Rubbing
故障：激光蚀刻拓样深浅不匀
标签：深浅不匀,离焦量,铜板反光,点阵密度,热积累
激光在铜板上蚀刻拓样出现局部过深或漏刻，常见原因有三：铜面反光致能量吸收波动——先以 320 目喷砂或拉丝哑化表面再蚀刻；离焦量超差——每次换板重新对焦（控制在 ±0.5 mm 内）；点阵线间距小于 0.06 mm 造成热积累——改用交错排布并将功率下调 10%。
Patchy over- or under-etching of a rubbing on copper usually stems from three causes: reflectivity swings—dull the surface first with 320-grit blasting or brushing before etching; focus drift—re-focus for every new sheet within ±0.5 mm; or heat build-up when hatch spacing falls below 0.06 mm—switch to staggered fills and cut power by 10%. ---