Altium 中做自定义焊盘 2015-04-08

Creating a Custom Pad Shape

Modified by on 8-Apr-2015

Language

Tworzenie padów o niestandardowych kształtach

Japanese

Standard Pad Attributes

Altium Designer's standard pad object can:

Be set to a number of different shapes, including round, rectangular, rounded rectangular and

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octagonal.

Be sized differently in the X and Y directions, extending the range of shapes that can be created.

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Be customized to change the shape for each layer of the board.

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Have a round or slotted hole, which can be offset from the pad center.

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Creating a Custom Pad Shape

To creates a different shape from those listed above, you create a custom pad shape. Custom pad shapes are created by placing other design objects, such as arcs, fills, lines or regions, to build up the copper shape required for the pad. A small pad is included within the shape to define the connection point in the pad, and if required, the drill hole location and size.

There is a huge variety of pad shapes needed for component footprints.*

Any Altium Designer design object can be used to build up the required copper shapes needed for the pads. Choose the object to suit the shape required, for example the copper contact area for the

switch shown below has been created from a series of track objects, surrounded by 2 arc objects.

The printed contact for a membrane switch.

Strategies for Creating Custom Shapes

For complex shapes the Solid Region object is ideal, as a polygonal object it can be used to create virtually any shape. The following footprint was created by first setting the grid to suit the zig-zag requirements of the copper, and then placing one region object to give a single zig-zag shape. This was then copied the required number of times to define the copper area of the capacitive slider footprint. Alternating surface mount and through-hole pads were added on alternating ends of each zig-zag to define the connection points.

Use the Solid Region object to create unusual shapes needed in a pad.

Using Guides to Place a Region

If the pad shape requires a shape defined at specific locations that do not fall onto a grid, it can be more efficient to define linear or point guides, and then place on these guides. The animation below shows an wedge-shaped pad being created by:

1.

Defining 4 Point Guides at the required locations in the Guide Manager dialog,

2.

Disabling the Snap to Grid option and enabling the Snap to Guides options,

3.

Placing a Solid Region with corners on these Point Guides,

Copying and pasting the Solid Region the required number of times, at the required angular

4.

intervals. The animation does not show placement of the pads, or the Solder Mask definition, which was done by placing a circle on the Solder Mask layer.