原创 Allegro中生成光绘文件步骤

在Allegro中生成光绘文件的步骤：

1 选取菜单Manufacture/Artwork,打开Artwork Control Form对话框，如下图设置

2 设置Film Control项，在这里添加需要的层，该项具体参数含义如下：

Film Name:底片名称     Rotation:底片旋转的角度      Offset X,Y:底片偏移量

Undefined line width: 未定义的线宽           Shape bounding box: 默认值为100，

表示当Plot mode为负片时，由Shape的边缘往外需要画100mil的黑色区域

Plot mode: Positive 为正片，Negative为负片    Film mirrored: 底片是否左右反转

Full contact thermal-reliefs: 只有当为负片时，此项才被激活

Suppress unconnected pads: 是否画出未连线的Pad.只有当层为内层时，此项才被激活

Draw missing pad aperture:若勾选此项，表示当一个Padstack没有相应的Flash D-Code时，系统可以采用较小宽度的line D-Code涂满此Padstack

Use aperture rotation: Gerber数据能够使用镜头列表中的镜头来旋转定义的信息

Suppress shape fill: 勾选此项表示Shape的外形不画出，使用者必须加入分割线作为Shape的外形，只有在负片的时候，此项才被激活。

Available films: 在这里添加你需要的层，下面以4层板为例：

TOP层：board geometry/outline

                manufacturing/photoplot_outline

                etch/top

                pin/top

                via class/top

               drawing format/title_data（加入注释文字，亦可根据习惯在其他层加入）

GND层：board geometry/outline

                manufacturing/photoplot_outline

                etch/gnd

                pin/gnd

                via class/gnd

               Anti Etch/gnd   

               Anti Etch/all

               drawing format/title_data

VCC层：board geometry/outline

                manufacturing/photoplot_outline

                etch/gnd

                pin/gnd

                via class/gnd

               Anti Etch/vcc   

               Anti Etch/all

               drawing format/title_data

BOTTOM层：board geometry/outline

                         manufacturing/photoplot_outline

                         etch/top

                         pin/top

                         via class/top

                        drawing format/title_data

SOLDERMASK_TOP层：board geometry/outline

                                            manufacturing/photoplot_outline

                                            via class/soldermask_top

                                            pin/soldermask_top

                                            package geometry/soldermask_top

                                            board geometry/soldermask_top

                                            drawing format/title_data

SOLDERMASK_BOTTOM层：board geometry/outline

                                                     manufacturing/photoplot_outline

                                                     via class/soldermask_bottom

                                                     pin/soldermask_bottom

                                                     package geometry/soldermask_bottom

                                                     board geometry/soldermask_bottom

                                                     drawing format/title_data
PASTEMASK_TOP层：board geometry/outline

                                         pin/pastemask_top

                                         drawing format/title_data
PASTEMASK_BOTTOM层：board geometry/outline

                                                  pin/pastemask_bottom

                                                  drawing format/title_data
SILK_TOP层： board geometry/outline

                           manufacturing/photoplot_outline

                           ref_des/silkscreen_top

                           package geometry/silkscreen_top

                           board geometry/silkscreen_top

                          drawing format/title_data
SILK_BOTTOM层：board geometry/outline

                                   manufacturing/photoplot_outline

                                   ref_des/silkscreen_bottom

                                   package geometry/silkscreen_bottom

                                   board geometry/silkscreen_bottom

                                   drawing format/title_data
DRILL层：board geometry/outline

                   manufacturing/photoplot_outline

                   manufacturing/ncdrill_legend

                   manufacturing/ncdrill_figure

                   manufacturing/nclegend-1-2

                   board geometry/dimension

                  drawing format/title_data

PCB板厂所需文件，同样以4层板为例：4个参数文件，11个光绘文件，共15个文件，其中pastemask_top.art   pastemask_bottom.art ，可以不用给到PCB板厂，因为此文件为钢网文件，只需给贴片开钢网时配合坐标文件使用。

nc_param.txt   ncdrill.tap (ncdrill.drl)   art_aper.txt    art_param.txt
top.art    gnd.art    vcc.art    bottom.art    soldermask_top.art     soldermask_bottom.art pastemask_top.art   pastemask_bottom.art    silkscreen_top.art    silkscreen_bottom.art drill.art

注：双面板只需去掉gnd.art    vcc.art ，多层板，只需再加上inner.art，多几层即加几层。