PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
PRINTED CIRCUIT BOARDS LAYOUT SPECIFICATION - Read
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MITAC <strong>SPECIFICATION</strong> SC830215321021 R07C<br />
作為 PICK & PLACE 機器之零點設定位置。<br />
如為雙面 SMC 板,則反面之左㆘角 FIDUCIAL 亦需作雙線㆕方形框之<br />
SILK SCREEN,此零點即是 SMC-CENTER LOCATION FILE 之原點。<br />
--39--<br />
0.060〞<br />
0.100〞<br />
板子前進方向<br />
板子左㆘角之 FIDUCIAL<br />
SILK SCREEN ㆖作㆒雙線正方形框<br />
18.4. 如 FIDUCIAL MARK 作在板外補齊邊㆖時(見 6.3 節),Fiducial DOT 邊緣距<br />
銑刀槽邊亦須保持 2.5mm (0.098〞)以㆖,因此該處之向外延伸距離至少<br />
2.35mm (93mil)<br />
0.404〞(0.093+0.098+0.039+0.173),延伸如此長距離,對板子製造成本增<br />
加,故儘可能把 FIDUCIAL MARK 作在板內。<br />
19. 標記(LABELING)<br />
PC 板線路區<br />
每㆒種PCB之設計,均需作㆘列標記或標註。<br />
2.5mm (98mil)<br />
1mm (39mil)<br />
4.4mm(173mil)
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