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1) BEGIN LAYER-----Thermal Relief Pad和Anti Pad比实际焊盘做大0.5mm/20mil
: s# a1 l, r. r4 X2 B* H0 x; k( e2)END LAYER与BEGIN LAYER一样设置
0 @. O' y3 u' B N( U% L9 l& n0 D' l2)DEFAULT INTERNAL尺寸如下
6 f( W$ e7 m4 x* B其中尺寸如下:! k! V" r. d; A; j4 H/ W9 g3 Y
DRILL_SIZE >= PHYSICAL_PIN_SIZE + 0.25mm/10MIL 6 Z7 n u" E/ X
Regular Pad >= DRILL_SIZE + 0.4mm/16MIL (DRILL_SIZE<1.27mm/50mil) Regular Pad >= DRILL_SIZE +0.76mm/ 30MIL (DRILL_SIZE>=1.27mm/50mil) E# r" J% ^: h8 C2 J, z
Regular Pad >= DRILL_SIZE + 1mm/40MIL (钻孔为矩形或椭圆形时)(1mm)
* O L' h' _0 ]4 i6 yThermal Pad = TRaXbXc-d其中TRaXbXc-d为Flash的名称(后面有介绍)3 e: A. A: t! a) W8 O6 k
Anti Pad = DRILL_SIZE + 0.76mm /30MIL
4 h+ Y7 p$ J m& J3 b; jSOLDERMASK = Regular_Pad + 0.15mm /6MIL
6 U$ N2 E1 r2 P: M( MPASTEMASK = Regular Pad (可以不要)6 f/ s$ Q3 q8 ^* S/ X
•Flash Name: TRaXbXc-d - W# C0 y, }0 n7 M ?
其中:- S# e" {7 l7 W; D G
a. Inner Diameter: Drill Size + 0.5mm/16MIL/ I7 M7 q5 I/ M) D, O% C
b. Outer Diameter: Drill Size + 0.76mm/30MIL. H) c; E. N- @9 ~
c. spokes:
3 l$ u% b) }3 F7 U0.3mm/12mil (当DRILL_SIZE = 10MIL/0.25mm以下)
0 L' E8 I! A/ [$ ~0.4mm/15mil (当DRILL_SIZE = 11~40MIL/0.28mm~1mm)
( b. f/ C& ]! ^" W4 U0.5mm/20mil (当DRILL_SIZE = 41~70MIL/1mm~1.8mm)5 D, H) ^$ W k+ C& P+ O
0.76mm/30mil (当DRILL_SIZE = 71~170 MIL/1.8mm~4.3mm)9 r; ~4 C( f2 s3 `4 R6 W0 `" Z
1.0mm/ 40mil (当DRILL_SIZE = 171 MIL/4.3mm以上)2 k0 S9 \9 I9 I/ V+ Q# s
也有这种说法:至于flash的开口宽度,则要根据圆周率计算一下,保证连接处的宽度不小于0.25mm/10mil。
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