YesAX V3.1.2 - Software User Manual - 第193页

A dvance Inspection Features 14 -7 9 - Used for block fiducials and local fiducials Part Anchor adjusts position for all inspection boxes of one part. Part anchor use an anchor number of 7. When rotation compensation is …

14-6 Advance Inspection Features

14.4 Anchor Block Fiducial and Local Fiducial

Anchor Block Fiducial and Local Fiducial are run-time position compensation features that

operate based on similar principles. They utilize the position measurement capability of the

marking inspection to compensate for positional offset of other inspection boxes and parts. By

utilizing them, you can achieve higher inspection precision than the mechanical accuracy and

repeatability of the XY stage.

Anchor Block Fiducial and Local Fiducial have different scope of effectiveness. Mark anchor

has the shortest scope; it adjusts positions of inspection boxes within a part. For example, you

can use it to have the solder inspection boxes (and/or lead inspection boxes) to follow the

marking inspection boxes. This is useful to inspect solder for parts that are allowed to shift

within a certain range. Multiple anchors can be deployed within one part. The Anchor Number

parameter is used to differentiate the anchors.

Here is a description for anchor number:

0 – Means anchor feature is disabled

1-6 - Used for inspection box anchors

7-8 - Used for part anchors.

Advance Inspection Features 14-7

9 - Used for block fiducials and local fiducials

Part Anchor adjusts position for all inspection boxes of one part. Part anchor use an anchor

number of 7. When rotation compensation is needed user can use anchor number 7 and 8. When

anchor 7 is assigned to a part, the individual inspection boxes do not need to assign specific

anchor number to receive the positional adjustments; all inspection boxes on that part will

automatically receive the same adjustment from one anchor.

To have the part anchor inspected in the same frame as all the inspection boxes of that part, the

“PartAnchorMode” parameter inside YesAX.ini file, [OperationOptions] session needs to be set

to 1. When set this parameter to 1 instead of its default number 0, please make sure that the part

is actually bigger than the frame size.

Block Fiducial adjusts position for all parts of the block. That can be exactly one block fiducial

per block. To create a block fiducial, create a part with reference ID BLKFIDU and add a

marking inspection block for it. You can use the Update Block feature to populate the Block

fiducial to all blocks. It is possible to have 2 block fiducial for each block if we also want to

compensate for rotational discrepancy from block to block. The second block fiducial must have

a Reference ID of BLKFID2. A line draw from BLKFIDU to BLKFID2 should pass close to the

center of the block area. Block fiducials work best for recipes with small numerous blocks, for

recipe with 2 or 3 large blocks it may be better to use another feature called “Per Block

Alignment Marks”.

Local fiducial adjusts part positions in nearby inspection frames after the frame containing the

local fiducial. Its effective range is around 50 mm. The range of multiple fiducial can overlap. To

create a local fiducial, create a part and give it a reference ID like LOCALFIDUx where x can

be a number to identify multiple local fiducials.

All the fiducial’s effectiveness can be interactively verified by doing a Test for the marking

inspection. The affected inspection boxes and parts will move to adjusted positions. To reset the

anchor effect, press the Reset Pos. button on the Anchor dialog. The Is Anchor check mark in

the Anchor Setup dialog helps distinguish an anchor inspection box from an inspection box being

anchored. With it you can setup a marking box to anchor another marking box.

14-8 Advance Inspection Features

Anchors are normally Mark inspection boxes. The changes in the Mark inspection boxes

propagate via part number during a library update. Sometimes it is advantageous to have anchor

functions propagate via package as opposed to part number. YesAX software allows solder

inspection boxes to also be used as an anchor. To do so, select Pattern Matching as the decision

algorithm for the inspection box and select direction N in the Edit Solder Parameters dialog. Also

in the Pattern Matching Parameters dialog, select Is Anchor.