IPC-A-600H-2010 中文版 印制板的可接受性 (1).pdf - 第57页
Acceptable - Class 1 （可接受条件 - 1级） • Marking defects regardless of cause, (i.e., solder bridging, over- etching, etc.) as long as characters are legible. • Marking does not violate the minimum electrical clearance limits.…
An etched marking is produced the same as the conductors on the printed board. As a result, the following criteria shall be met for etched
marking:
蚀刻标记的制作和印制板上的导体制作是相同的。因此，蚀刻标记应当符合下列要求。
Target Condition - Class 1,2,3（⽬标条件 - 1,2,3级）
• Characters are legible.
• Minimum conductor spacing requirements have also been main-
tained between etched symbolization and active conductors.
• 每个字符均清晰可辨。
• 蚀刻字符和有源导体之间保持最小导体间距要求。
Acceptable - Class 3（可接受条件 - 3级）
• Marking defects regardless of cause, (i.e., solder bridging, over-
etching, etc.) as long as characters are legible.
• Marking does not violate the minimum electrical clearance limits.
• Edges of the lines forming a character may be slightly irregular.
• 在字符清晰可辨的情况下，标记缺陷（例如焊料桥连、过度
蚀刻等）均可接受。
• 标记不违反最小电气间隙要求。
• 形成字符的线条边缘可以呈现轻微的不规则。
Acceptable - Class 2（可接受条件 - 2级）
• Marking defects regardless of cause, (i.e., solder bridging, over-
etching, etc.) as long as characters are legible.
• Marking does not violate the minimum electrical clearance limits.
• Width of the lines forming a character may be reduced by up to
50%, providing they remain legible.
• 在字符清晰可辨的情况下，标记缺陷（例如焊料桥连、过度
蚀刻等）均可接受。
• 标记不违反最小电气间隙要求。
• 形成字符的的线条宽度可减少50%，只要线条仍可辨识。
图281a
图281b
2.8 MARKING（标记）
2.8.1 Etched Marking（蚀刻标记）
48 IPC-A-600H-20102010年4月
Acceptable - Class 1（可接受条件 - 1级）
• Marking defects regardless of cause, (i.e., solder bridging, over-
etching, etc.) as long as characters are legible.
• Marking does not violate the minimum electrical clearance limits.
• Legends are irregularly formed but the general intent of the leg-
end or marking is legible.
• 在字符清晰可辨的情况下，标记缺陷（例如焊料桥连、过度
蚀刻等）均可接受。
• 标记不违反最小电气间隙要求。
• 字符形状不规则，但字符或标记的基本含义尚可辨认。
Nonconforming - Class 1,2,3（不符合条件 - 1,2,3级）
• Defects either do not meet or exceed above criteria.
• 缺陷不符合或超出上述要求。
图281c
图281d
2.8 MARKING（标记）
2.8.1 Etched Marking (cont.)（蚀刻标记（续））
49IPC-A-600H-2010 2010年4月
Screened or ink stamped marking refers to any type of marking that is printed on top of the printed board. No cutting or etching is involved
in producing this type of marking.
网印或油墨盖印标记指印在印制板面上的任何类型的标记。这种类型标记的制作不可含有切入或蚀刻的作法。
Target Condition - Class 1,2,3（⽬标条件 - 1,2,3级）
• Characters are legible.
• Ink distribution is uniform, with no smearing or double images.
• Ink markings are no closer than tangent to a land.
• 字符清晰可辨。
• 油墨分布均匀，没有模糊不清或重影。
• 油墨标记至多与焊盘相切。
Acceptable - Class 2,3（可接受条件 - 2,3级）
• Characters are legible.
• Ink may be built up outside the character line providing the char-
acter is legible.
• Portion of component clocking symbol outline in the Figure 282c
example may be missing, providing the required clocking is
clearly defined.
• Marking ink on component hole land does not extend into the part
mounting hole, or reduce minimum annular ring.
• Marking ink is allowed in PTHs and via holes into which no com-
ponent lead is soldered unless the procurement document requires
that the holes be completely solder filled.
• No encroachment of marking ink on edge board printed contacts
or test points.
• On surface mount lands with a pitch of 1.25 mm [0.04921 in] or
greater, encroachment of marking ink is on one side of land only
and does not exceed 0.05 mm [0.0020 in].
• On surface mount lands with a pitch less than 1.25 mm [0.04921
in], encroachment of marking ink is on one side of land only and
does not exceed 0.025 mm [0.000984 in].
• 字符清晰可辨。
• 只要字符可辨，油墨可以堆积在字符线条以外。
• 只要要求的方位仍清楚明确，图282c示例中所图示的元器件
方位符号的轮廓可以部分脱落。
• 元器件孔焊盘的标记油墨不得渗入部件安装孔内，或造成环
宽低于最小环宽。
• 除非采购文件要求孔被焊料完全填充，不焊接元器件引线的
镀覆孔和导通孔内允许有标记油墨。
• 阻焊剂没有侵占到板边印制接触片或测试点表面。
• 对于节距大于等于1.25mm[0.04921in]的表面贴装焊盘，油墨
只能侵占焊盘的一侧，且不超过0.05mm[0.0020in]。
• 对于节距小于1.25mm[0.04921in]的表面贴装焊盘，油墨只能
侵占焊盘的一侧，且不超过0.025mm[0.000984in]。
图282a
图282b
图282c
2.8 MARKING（标记）
2.8.2 Screened or Ink Stamped Marking（⽹印或油墨盖印标记）
50 IPC-A-600H-20102010年4月