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An example of a custom coverlay
A common feature on rigid-flex boards is the selective use of coverlay material. This insulation layer is cut and laminated onto specific areas of the board, and because of this selective use, custom coverlay is often referred to as bikini coverlay. As well as its use in specific areas of the board, custom coverlay can also be positioned anywhere in the layer stack.
Custom coverlay is added in the Layer Stack Manager and the shape manipulated in Board Planning Mode once the Custom Coverlays option is enabled in the Board Region dialog for that region of the board. Coverlay polygons are derived from the Polygon Pour object, limited in functionality to just being used as a means of creating a custom coverlay shape.
A custom coverlay is added in the Stackup tab of the Layer Stack Manager (Design » Layer Stack Manager). Flex-specific bikini coverlay layers can only be added in a Substack that has the "Is Flex"option enabled.
Configure the properties of the substack directly in the Layer Stack Manager or in the Properties panel.
To add a custom coverlay:
Add the bikini coverlay layers into the required stack and configure the layer properties in the Layer Stack Manager or Properties panel.
Custom coverlay must be enabled for each board region where it has been added to that region's layer stack. To enable the custom coverlay:
A coverlay is automatically added to cover the entire area of the board region to which it was added. Behaving like an additional solder mask layer, openings are automatically created for component pads in accordance with the applicable Solder Mask Expansion design rule or according to the settings in the Pad dialog if the Solder Mask Expansions setting has been configured to override the design rule.
Coverlay Polygons can be placed when a PCB Editor is in Board Planning Mode. Select the Design » Place Coverlay Polygon command from the main menus.
Press Shift+Spacebar to cycle through the five available corner modes, press the 1 shortcut to toggle placement between two edges or one edge.
This method of editing allows you to select a placed coverlay polygon object directly in the workspace and graphically change its size, shape or location.
Click once on a coverlay polygon object to select it, which puts it into edit mode. The outer shape of the coverlay polygon object is defined by a series of edges, where each edge is represented by an end vertex at each end, shown as a solid white square, and a center vertex in the middle is shown as a hollow white square. Each end vertex represents the location where two edges meet.
A selected Coverlay Polygon
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