5186-5190 Algorithm User Manual
Contents
1. Assigned by Ref Des click the to the left of it see Figure 4 a This will cause the list of reference designators on the current board that have been assigned To launch the device editor right click a reference designator from the list and from the menu that appears select Edit Algorithm see Figure 4 b This will launch the Algorithm device editor VIEW F EWE F xy Board PasteB Ak i Board PasteB Ak Eg Trained E lt Trained rade oe Assigned By Shape p Assigned By Shape nee Assigned By Part Ho DEEN Assigned By Part Mo Big Assigned By Ref Des Deg Assigned By Ref Des 2 lt z e JET e dit Algarithrn lB Fiducials lB Fiducials HE data vispcad dat HE data vispcad dat a b Figure 4 a Expand Assigned By Ref Des by clicking the symbol beside it b Right click a part number in the list and select Edit Algorithm Board Tree gt Board Name gt Database The third way to launch the Algorithm Editor from the board tree is to expand the data vispcad dat click the to the left of it see Figure 5 a This will cause the list of category folders including Paste and possibly Ellipse this is associated with 2D fiducial plate inspection Expand the Paste folder click the to the left of it This will cause a list of device types to be displayed To launch the device editor right click a reference designator from the list and from the2. Clicking this button will move the focus to the next reference designator in the current device type s group If one then clicks the Inspect button the new reference designator will be inspected This next reference designator is chosen on the basis of deposit order in the inspection plan Create Create 5186 5190 A O Agilent Technologies 5186 5190 Clicking on this will cause a new device type to be automatically created in the database Just before this a dialog box will appear describing the operation being performed see Figure 16 The dialog is dismissed by clicking the OK button The new device type will be based on the device currently being edited will have the same characteristics of nominal dimensions but will have an independent set of parameters The purpose of this is so that one may assign see note on Assign button a particular reference designator of the original device type to this new device type and give it unique parameters This may be favourable for situations where pads are in unusual locations and should be treated differently for some reason For example for a vertical QFP type where bridging is checked to the right of each deposit and setup to do so by editing the device type in question one might not want to have bridge detection enabled for the right most deposit SP50 GUI New algorithm created called pa _ 0864x0864f100a This algorithm was based on pa_0864x0864f100 A
3. Agilent Technologies 5186 5190 Algorithm User Manual Agilent Technologies Silverstone House Ballymoss Road Sandyford Industrial Estate Dublin 18 Ireland Phone 353 1 6058320 Fax 353 1 6058321 All rights reserved No part of this document may be stored in a retrieval system transmitted or used in any form or by any means electronic mechanical photocopying recording or otherwise without the prior permission of the copyright holder Agilent Technologies retains the right to modify this document without notice 5186 5190 A 1 Agilent Technologies 5186 5190 Revision History Nature of Change John Milroy 1 Mar 03 5186 5190 A O Agilent Technologies 5186 5190 The Algorithm Editor Click gt click left mouse button Double Click gt double click left mouse button Right Click gt click right mouse button Algorithm Device Device Type Paste Type The device algorithm editor is a form that allows the user to edit the parameters associated with any device type see Figure 1 The device editor can be launched from a number of different parts of the SP50 software interface Specifically it may be launched from the board tree view the inspection list view and the Find tool pa_0 78x17 43h 00 Paste Main lt Algorithm lt pa 0178114300 Ni Algorithm pa 0178x1143f100 Comment Automatic Paste part Paste Size um 178 Paste Size T urn 1143 Search Area X um 445 Sear
4. completes the user can review the error data deposit results by clicking any reference designator in the Failed list To launch the Algorithm Editor Right Click a reference designator from the list perhaps one whose type parameters in particular you wish to edit From the menu that appears select Edit and from the mini menu that appears then select Algorithm see Figure 6 Note that the same procedure can be applied to launch the Algorithm Editor from the Passed list to display the list double click the Passed icon Note If the Inspection List is not visible it can be brought up by selecting it from the View menu see Figure 7 5186 5190 A Agilent Technologies 5186 5190 Passed Ka Failed 2 0 n1686 1 lt YOlfse lt n1685 1 lt YOffse Inspect 2D mode ot Inspect 3D mode Edit k i Algorithm C Save Image 4 CrawlT est Figure 6 Select failed deposit from list right click and select Edit Algorithm from the menu Wey N Boards E Board Tree E i Inspection List Figure 7 Inspection list can be accessed from the View menu Find Tool The Find Tool can be accessed by clicking the Find button on the main Engineer form s toolbar the button is shown in Figure 8 Figure 10 a shows the Find Tool form that is loaded Of Type indicates the attribute on which the search will be based the default is Device Type but
5. follows Nominal Area Nominal Height Volume Fill 100 Area Fill Area Fill 100 The area reported by the system is expressed as a percentage of the nominal area The nominal area is computed using the nominal X and Y dimensions of the deposit type 1 e Paste Size X and Y However because not all deposits are rectangular the nominal area cannot always be computed simply as the product of the nominal X and Y dimensions The nominal X and Y dimensions more accurately represent the minimum bounding box within which the deposit fits As an example lets take a circular deposit its nominal X dimension equals its nominal Y dimension but computing their product would lead to an over estimated nominal area value This is where the Area Fill value is used The area of a circle whose diameter is D units long 1s approximately 79 percent of the area of a square whose side is D units long i e circle area PI R R PI D 2 2 100 1 D 2 79 approx Thus the nominal area is D D 79 100 In this example 79 is the fill factor for the round deposit All circular or oval deposits will have this fill factor When the database entry for a new deposit type is created the fill factor is read in from the device type this 1s the 3 digit number at the end of the device 5186 5190 A O Agilent Technologies 5186 5190 type e g pa 1000x04001079 Subsequently the value may be changed by the user if required The new value will then b
6. indicates circle or ellipse third and last numerical parameter of device type Ad reported area result Volume is reported as a percentage of the nominal volume Nominal volume is computed as follows V g A H e nom 100 10 Vi J x 100 Va Where V is the absolute area as computed in equation 6 V om 1S the nominal volume of the deposit 5186 5190 A O Agilent Technologies 5186 5190 Aom 1S the nominal area as computed in equation 7 above H om 18 the nominal height of the deposit parameter in database and can be set in device editor Fume 1S the volume fill percentage V 5 reported volume result Classification of Errors Error classification is achieved through the use of upper and lovver tolerances on each of the results These tolerance thresholds can be accessed and changed on either a per device type basis or globally using the device editor If a value is outside this pre defined range then an error will be reported This applies to all measures 1 e Area Height and Volume The tolerance comprises a lower bound value any measure below which is considered too low and an upper bound value any measure above which is considered too high The classification chain 1s as follows IF Area gt Upper Area THEN Report High Area ENDIF IF Area lt Lower Area THEN Report Low Area ENDIF IF Height gt Upper Height THEN Report High Height ENDIF IF Height lt Lower Height T
7. of all tangible types already present on the board and in the database It provides a means of storing the global parameter information in means that complies with the conventions that the software uses to effect the storage of device parameters It is however treated differently by the software Global Parameters The parameters for the global paste type are divided into the same two sections as those for the specific paste types The Pass Fail Criteria parameters match exactly those of the specific paste type PJ Algorithm pa 9999499991999 Search Area s 150 Search Area Z Y 150 Nominal Height urr 150 Volume Fill 72 od Area Fill 993 Nominal Paste Factor Z O Bridging g No Bridging Paste Threshold urn cU Bridge Threshold url Bridge Thickness urn The General parameters for the global paste type are the same as the specific device type parameters but don t include a Comment parameter and don t have a Paste Size X um nor Paste Size Y um parameter They do include two parameters that don t exist for the individual devices specific paste type namely Search Area Yo X and Search Area Y These are described in the following two sections 5186 5190 A O Agilent Technologies 5186 5190 Search Area X Search Area 150 This parameter is related to the Search Area X um parameter encountered in the general section of the specific device type ed
8. pa 9999999919997 h Changes willbe saved to database datajvispcad dat Q User Warning Dialog Boxes associated with Save 5186 5190 A Agilent Technologies 5186 5190 algorithm lt Global Paste Algorithm g O No Bridging 5186 5190 A Agilent Technologies 5186 5190 Upper Area 7 140 Lower Area 2 70 Upper Height um 180 Lower Height um 100 Upper volume 2 130 Lower Volume 2 r Upper Offset um 200 Lower Offset um 200 Upper Y Offset um 200 Lower Y Offset urm 200 Bridging s No Bridging d Paste Threshold um Bridge Threshold ur Select Bridging s No Bridging Paste Threshold um Bridge Threshold ura Specifics of the Algorithm Generate a histogram of the search region containing the deposit see Figure 17 Eliminate the estimated number of paste pixels from the histogram based on the nominal deposit area Calculate the average of the remaining pixels to give the background level The reference level computed will be biased towards the most frequently occurring value in the region NOTE It is not easy to distinguish between various background elements within this range of data Best Case Scenario The reference level will be computed as bare copper in the vicinity of the deposit Worst Case Scenario Reference level will be computed as bare substrate this is unlikely since there will generally be some track and or mask i
9. reliable reference level Bridging Bridging g 0 Mo Bridging This parameter can have any one of 4 possible settings see Figure 12 which are selectable from a drop down menu that appears when one clicks on the button to the right of the box By default mo de 0 No Bridging is selected 0 No Bridging Bridge detection is not active 1 Bridging Right Determine if a bridge is present to the right of the deposit horizontal bridge 2 Bridging Down Determine if a bridge is present below the deposit vertical bridge 3 All Bridging Determine if a bridge is present to the right of the deposit horizontal bridge and below the deposit vertical bridge Bridging D No Bridging 0 No Bridging amp 1 Bridging Right 2 Bridging Down 3 All Bridging Figure 12 Bridging level enable disable menu A bridge is considered to be present if paste 1s deemed present within the automatically generated bridge boxes pixels relative to background are greater than the Bridge 5186 5190 A O Agilent Technologies 5186 5190 Threshold and within the bridge boxes the paste pixels from a continuous path from the left of the bridge box to the right of the bridge box for a horizontal bridge and or from the top of the bridge box to the bottom of the bridge box for a vertical bridge The bridge boxes are defined to extend to the right horizontal bridge detection or downward vertical bridge detection by
10. will revert back to the original parameter settings and no save operation will take place Note that making changes to a device type s parameters then switching to another device type will have the same effect as clicking the save button see Figure 15 If no changes have been made to the parameters clicking the Save button will have no effect User Warning 9 Save changes to current algorithm pa_203ex1 270f1007 gt Changes willbe saved to database datawispcad dat Figure 14 Dialog box requesting confirmation to save parameters Algorithm a 0864086400 5186 5190 A Agilent Technologies 5186 5190 a Algorithm a 0864x0864f100 gj pa 0864086417100 gj pa 061041626f 00 lt pa 086413930100 lt pa 068641803f100 d pa 16002210100 ina 0914x0965f100 4 pa_0965 0914f1 00 gj pa 121941016100 gj pa 142240914100 b Figure 15 Switching device type a Current device type b click arrow to the right and select new device type to edit Reset F Reset Clicking this button causes all parameters to be reset to their original values This will only revert parameters if the Save button has not already been clicked or it changes were made to this device type s parameters and a new device type has since been chosen see Figure 15 to see how to switching to a different device type in which case Yes would have been clicked on the dialog box of Figure 14 Next Next
11. HEN Report Low Height ENDIF IF Volume gt Upper Volume THEN Report High Volume ENDIF IF Volume lt Lower Volume THEN Report Low Volume ENDIF 5186 5190 A Agilent Technologies THEN Report Bridge ENDIF Fiducial Plate and e type e100 Paste 5186 5190 a e100 Device Type 5186 5190 A circle for Use w calibration plat 3000 OO UJ Id Pol il rh co s circle elipse Pi I n C mm Agilent Technologies 5186 5190 Device Type s circle ellipse 5186 5190 A Agilent Technologies 5186 5190 F circlefellipse circle ellipse amp 1 sguarefrectangle g 2 diamond 5186 5190 A
12. a distance equal to the smallest of the X Y nominal dimensions of the deposit itself The other dimension of the bridge box will match the nominal length of the corresponding side from which the box is extended The box is extended equally to the left and right horizontal bridge detection so as to ensure that if there is a neighbouring deposit the box is likely to overlap it by at least a small amount as well as overlapping the deposit from which the box is extended Similarly the expansion is applied to the top and bottom in the case of vertical bridge detection Paste Threshold um Paste Threshold um al This is the height expressed in microns vvith respect to the reference level All paste measurements are carried out only on paste that is higher than this level Ideally this threshold should be set to approximately 40 50 of the stencil thickness expected paste height Bridge Threshold um Bridge Threshold um This parameter has a similar effect to the Paste Threshold parameter above However the difference is that this parameter is applied to the bridge box region s yellow box es rather than the paste deposit search region green box The purpose is to determine whether or not paste is present The Bridge Threshold would conventionally be less than the Paste Threshold because a bridge can be caused by paste that is considerably lower in height than the deposit itself but lying to the right or below the depos
13. abel is red in colour xa Reset Reset Button The above selection process can be applied to one or more parameters in the list 5186 5190 A Agilent Technologies 5186 5190 Gave Save Button To apply the selected red parameter s the user must either click the Save button at the bottom of the device editor or select another device from the list at the top of the device editor or close the device editor by clicking on the close button Be on the top right hand corner of the form right hand side of the title bar In either case the user vvill be presented with two consecutive dialogue boxes the first of which will as if the user wishes to save the new parameters the user can choose either Yes to agree to this or No to disagree and NOT save the parameter changes at this time If Yes is chosen then a warning dialo gue box will appear advising that the changes will be applied to a paste types Once again the user may click on Yes or No Yes will cause the selected global parameters to be immediately propagated to all paste types in the database If no changes have been made to the global paste parameters or no parameters have been selected for propagation then the dialogue boxes will not appear under any of the afore mentioned situations Save button switching to another device type closing the device editor c User Warning 2 Save changes to current algorithm
14. ch Area Y um 2858 Nominal Height uum 150 Volume Fill 2 59 Area Fill 2 100 Nominal Paste Factor Z 0 Bridging s D No Bridging Paste Threshold urn Bridge Threshold um Bridge Thickness um Upper Area Z 130 Lower Area 72 70 Upper Height um 180 Lower Height urn 100 E Information Algorithm Help T ext Ld gt g S Inspect Reset Hert Save Create Ash z Figure 1 Algorithm Editor Form 5186 5190 A O Agilent Technologies 5186 5190 Loading The Form The Board Tree There are currently 3 possible vvays that the algorithm editor can be launched through the board tree view To access the board tree view click the View button directly above the board list From the drop down menu that appears select Board Tree see Figure 2 a This will cause the Board Tree to appear see Figure 2 b Board PasteBAk ee E I k Trained E3 Boards re fs go Assigned By Shape ss H 42 Assigned By Part No RE eae Hee f gee lt Assigned By Ref Des Inspection List FI e Fiducials E E data vispcad dat 12 10 IQ IO Ic ELLEELLE Saved Error Images a b Figure 2 a Select Board Tree from the View menu b The Board Tree appears From the board tree expand the Assigned by Part No click the to the left of it see Figure 3 a This will cause the list of part numbers on the current board Note expanding any one of these part n
15. e stored in the database and will override the original value for nominal area computation Rectangular deposits will have a fill factor of 100 as they take up the entire bounding box The fill factor may be used to model various deposit shapes so as to best estimate their nominal or expected area Nominal Paste Factor Mominal Paste Factor 2 U Typically the image of a paste deposit consists of two main regions what is considered to be paste and what is considered to represent the background or reference level A histogram is generated of the image and an estimate of the number of paste pixels present is removed from the high end or right hand side of the histogram The remaining data is averaged to achieve a reference level with respect to which the paste height can be computed It is however desirable to over estimate the amount of paste present as under estimation can lead to a mean value that is biased towards the right hand side of the histogram the high end which can lead to an incorrect reference level In fact it is most likely to cause an over estimation of the reference level so that subsequent height calculations will be lower than expected By default this parameter is set up to be 100 of the nominal paste size Any value entered in this field that is less than 100 will be interpreted as 100 It is however better to overestimate and set this value to be 120 150 of the nominal paste size so as to be certain to get a
16. ei 240685 DO ised mr ipa 17784076 A Balta fes cl pa 205241651 Fae E d A lg catar 171 pa 1004 151 OR E l pa 065841117F1 00 Used dt pa 12704 200 1 00 Usad Ti SHEH setit fi ii d Figure 10 a Find Tool form b Some search text can be entered in the Containing Text box By default it will search for device types c When the Search button on the Find Tool form is clicked a list of device types matching the pattern given in Containing Text box will be listed d Right clicking any device type from the list will cause a menu to appear launch the algorithm editor by selecting Edit Algorithm 5186 5190 A Agilent Technologies Device Parameters General 5186 5190 This can be hidden by clicking on the General bar at the top of the corresponding section of parameters Clicking the bar again will cause the corresponding section to be visible again see Figure 11 FjAlgorithm pa_0178x1143A 00 Comment Automatic Faste part Paste Size 7 um 178 Paste Size um 1143 Search Area um 445 Search Area t um 2059 Nominal Height urn 150 volume Fill 7 od Area Fill Fe 100 Nominal Paste Factor Z 0 Bridging s O No Bridging Paste Threshold urn a0 Bridge Threshold Lum Bridge Thickness um Figure 11 Algorithm General Parameters Algorithm Algorithm pa 01788114300 This identifies the device type algorithm current
17. ifically the reported error would be Area meaning insufficient in area Upper Height um Upper Height uml 180 Height is computed in microns If the computed height for a deposit is greater than this upper limit the paste deposit 1s considered to be excess in height resulting in that deposit failing for height Specifically the reported error would be gt Height meaning excess in height Lower Height um Lower Height urm 100 Height is computed in microns If the computed height for a deposit is less than this lower limit the paste deposit is considered to be insufficient in height resulting in that deposit failing for height Specifically the reported error would be SHeight meaning insufficient in height Upper Volume Upper volume 2 130 5186 5190 A O Agilent Technologies 5186 5190 Since volume is reported as a percentage of the nominal volume this is the Upper Limit on reported volume above which the paste present is considered to be excess which will result in failed deposit Specifically the reported error would be gt Volume meaning excess in volume Lower Volume Lower Volume p fall Since volume is reported as a percentage of the nominal volume this is the Lower Limit on reported volume below which the paste present is considered to be insufficient which will result in failed deposit Specifically the reported error would be lt Volume meaning insufficient in volume U
18. ile or on the GUI Specifically The nominal area is computed as follows Paste Size X Paste Size Y Area Fill 100 Paste Size Y um Paste Size r um 1143 This identifies in microns the Y dimension of the paste deposit When the database entry recorded set of parameters is first created this value represents the second numerical value encountered when reading the device type from left to right The value may subsequently be changed by the programmer if requred The new value if saved will overwrite the original value and be used in relevant computations for that device type from that point onward Paste Size Y of course may or may not be the vertical dimension as this is dictated by orientation often 0 degrees which is a CAD parameter in the plx file e g a QFP may have more than one orientation 0 or 90 degrees say Regardless though the Y dimension remains the same So given a QFP type deposit whose device type is pa 1000x04001100 the Y dimension is 400 microns when this deposit is oriented at 0 degrees and its vertical dimension on screen is also 400 microns However if the same device is oriented by 90 degrees the vertical dimension becomes 1000 microns whereas the Y dimension remains the same at 400 microns The Paste Size X contributes to the nominal area computation see description of Paste Size X to see how the nominal area is computed Search Area X um Search Areas um 445 This identifies in micr
19. in advance of computing reference level b Calculation is biased towards the high end of the grey scale right hand side of the histogram thus resulting 1n a reference level that is too high Computing Area Height and Volume The deposit image 1s segmented on the basis of the paste threshold as entered by the user into the device editor and the computed reference level for that deposit The threshold value above which is considered to be paste is given by B P where B is the background level and P is the threshold entered in the device editor and represents the value relative to the background above which is considered paste see Figure 19 The boundary of the paste deposit is found on the basis of this threshold The area is deduced from the boundary information In effect the all of the pixels present within the boundary are counted and multiplied by the area of a single pixel constant for all pixels see equation 1 5186 5190 A Agilent Technologies 5186 5190 Paste Copper EO Mask GE substrate a ee i B P B Base Line Zero b Figure 19 a Schematic cross section of a paste deposit showing some of the various elements that surround the deposit b Same schematic as a but with computed reference background level indicated along with the paste threshold level te B e Base Line Zero Figure 20 This shows schematically the error in computing the pad level 5186 5190 A O Agile
20. it itself This threshold should ideally be set somewhere between 30 and 60 microns Bridge Thickness um Bridge Thickness urn The thickness of the bridge at its narrowest point must exceed this in order to be considered as a bridge The thickness is measured along the vertical for horizontal bridges and along the horizontal for vertical bridges Pass Fail Criteria This can be hidden by clicking on the Pass Fail Criteria bar at the top of the corresponding section of parameters Clicking the bar again will cause the corresponding section to be visible again 5186 5190 A O Agilent Technologies 5186 5190 Upper Area 130 Lower Area 2 r Upper Height furn 180 Lower Height urn 100 Upper Volurne 2 130 Lower volume 2 r Upper Offset urm 200 Lower Offset um 200 Upper Y Offset um 200 Lower Offset um 200 Figure 13 Algorithm Pass Fail Criteria Upper Area Upper Area 140 Since area is reported as a percentage of the nominal area this is the Upper Limit on reported area above which the paste present is considered to be excess which will result in failed deposit Specifically the reported error would be gt Area meaning excess in area Lower Area Lower Area 2 nil Since area 1s reported as a percentage of the nominal area this is the Lower Limit on reported area below which the paste present is considered to be insufficient which will result in failed deposit Spec
21. itor The parameter allows the user to apply a global adjustment to Search Area X um which would be applied individually to each paste type in the database on the basis of the nominal X size Paste Size X um of each paste deposit The parameter represents a percentage The new Search Area X um parameter value is computed as 100 Search Area X Paste Size X um 100 By default for newly created paste database entries this parameter is initialized to 150 The minimum recognized value that can be applied is 50 and the maximum is 300 Search Area Y Search Area Y 150 This parameter is related to the Search Area Y um parameter encountered in the general section of the specific device type editor The parameter allows the user to apply a global adjustment to Search Area Y um which would be applied individually to each paste type in the database on the basis of the nominal Y size Paste Size Y um of each paste deposit The parameter represents a percentage The new Search Area Y um parameter value is computed as 100 Search Area Y Paste Size Y um 100 By default for newly created paste database entries this parameter is initialized to 150 The minimum recognized value that can be applied is 50 and the maximum is 300 How to Apply Global Parameters In order to apply one or more global parameters to all paste types in the currently loaded database which i
22. ly being edited Comment Comment User definable comment just a label not processed Automatic Paste part Paste Size X um Paste Size um 173 This identifies in microns the X dimension of the paste deposit When the database entry recorded set of parameters is first created this value represents the first numerical value encountered when reading the device type from left to right The value may subsequently be changed by the programmer if required The new value if saved will overwrite the original value and be used in relevant computations for that device type from that point onward Paste Size X of course may or may not be the horizontal dimension as this is dictated by orientation often 0 degrees which is a CAD parameter in the plx file e g a QFP may have more than one orientation 0 or 90 degrees say Regardless though the X dimension remains the same So given a QFP type deposit 5186 5190 A O Agilent Technologies 5186 5190 whose device type is pa 1000x04001100 the X dimension is 1000 microns when this deposit is oriented at 0 degrees and its horizontal dimension on screen is also 1000 microns Hovvever if the same device is oriented by 90 degrees the horizontal dimension becomes 400 microns whereas the X dimension remains the same at 1000 microns The Paste Size X contributes to the nominal area computation The absolute area is expressed as a percentage of this before being reported in the report f
23. menu that appears select Edit see Figure 5 b This will launch the Algorithm device editor This may be a different file but will have a dat extension regardless 5186 5190 A O Agilent Technologies 5186 5190 View F EI F JE F By j View F Board PasteBAk Board PasteBAK Board PasteBAK E t Trained E ka Trained Se lt i Trained E i S Assigned By Shape S Assigned By Shape 8 Assigned By Shape Z Assigned By Part No i G d Assigned By Part No Ba 4 Assigned By Part No t Assigned By Ref Des F lt Assigned By Ref Des l Hil lt Assigned By Ref Des Eh 4 re H emen m Fiducials data vispca d at Fr ata vlspca l data vispcad dat EH Ga Paste Be io Paste sje E _ Ellipse h a b c Figure 5 a Expand data vispcad dat or equivalent by clicking the symbol beside it b Expand Paste folder by clicking the symbol beside it c Right click a device type in the list and select Edit Inspection List Pass Fail The Algorithm editor can be launched from the Inspection List at the end of an inspection To do this run an inspection during the inspection the Inspection List will automatically appear on the left where board list would normally appear and if there are errors on the board the associated reference designators will be listed under the label Failed This list 1s expanded by default When the inspection
24. microns If the computed Y Offset for a deposit is less than this lower limit the paste deposit will fail for Y Offset Specifically the reported error would be lt YOffset Typically this lower limit will be a negative value indicating that the computation is direction sensitive If the deposit fails for this reason on can tell that the deposit is offset in the negative Y direction 5186 5190 A O Agilent Technologies 5186 5190 Action Buttons There are 6 action buttons at the bottom of the device editor form Namely these are Inspect Inspect When this button is clicked the system will attempt to perform a live scan of the deposit that is currently selected in the context of the parameters currently displayed including any recent changes if applicable The deposit may have been selected from the inspection list or the Find tool If no specific deposit has been selected 1 e the algorithm editor was launched by right clicking a paste part number or a algorithm type then the first deposit in that group part number or algorithm editor will be inspected Save a Save If the user has made changes to parameters clicking on this button vvill cause the changes to be saved to the active database e g vispcad dat However before this occurs a User Warning dialog box will appear see Figure 14 Clicking the Yes button on this dialog box will cause the recent changes to be saved Clicking the No button
25. n the vicinity Most Likely Scenario Generally the computed reference level for a particular deposit will lie somewhere between the substrate level and the pad level Regardless an error will result since the 5186 5190 A O Agilent Technologies 5186 5190 reference level vvill not be that of the pad This error is represented graphically in Figure 20 Section 9 outlines some future developments to eliminate this error b Paste Height Reference Level c Figure 17 a deposit image left and associated histogram right b Deposit image showing much of the paste data removed left and the associated histogram right c Schematic showing paste height relative to reference plane It is desirable to over estimate the amount of paste present as under estimation can lead to a mean value that is biased towards the right hand side of the histogram the high end which can lead to an incorrect reference level In fact t is most likely to cause an over estimation of the reference level so that subsequent height calculations will be lower than expected The effect is shown schematically in Figure 18 5186 5190 A O Agilent Technologies 5186 5190 a KE Z S CRE es R he Paste Height Computed eels ee HS ru Ay Sage ee ket we gt gt gt gt gt gt F gt Reference Level v r te K Height Error Reference Level b Figure 18 a Under estimated paste quantity
26. ncludes those present in the loaded board CAD one must consider the following The global paste type must be selected from the type list at the top of the device editor 5186 5190 A O Agilent Technologies 5186 5190 a 0556x1117f100 gj pa 1270 2032 00 gj pa_0889 0558f1 00 lt pa_1905x0635F1 00 gj pa 2032 1651 00 lt pa 27941203200 Algorithm gj pa_1270 3048h 00 gj pa 1016238101100 gjit pa 1651x1524 00a j lobal Paste kal A parameter can only be globally applied if it is selected for that purpose First the parameter label e g Paste Threshold um must be clicked this will cause the parameter to be highlighted in bold Paste Threshold um 8 Paste Threshold um Selection for propagation is then achieved by either e changing the value of the parameter in which case the parameter label change colour to red Paste Threshold um Paste Threshold um 41 OR e pressing the F2 function key This is the option that should be used when the existing parameter in the field is satisfactory and the user wishes to propagate this A parameter can be deselected in the same way so as not to be globally applied All parameters can be deselected and reset to their original values if applicable by clicking the Reset button at the bottom of the device editor Note the Reset button will be greyed out inactive if no parameter is selected for propagation the l
27. nt Technologies 5186 5190 Figure 21 Deposit image showing tracked boundary colour overlay A na 1 where n is the number of pixels present within the boundary and a is the area represented by a single pixel The height is computed as the average height within in the tracked boundary relative to the background level B n l 2 where n is the number of pixels present within the boundary and H is the average height of the deposit and h is the height associated with pixel within the boundary The volume is then computed as the product of the computed area and average height We can arrive at this through the following Volume is the summation of all of the individual pixel volumes within the boundary 3 n 1 4 5186 5190 A O Agilent Technologies 5186 5190 Rewriting this we get the following n l 5 h V na n Substituting for equations above we get V AH 6 The final representation of Height is in microns Area is reported as a percentage of the nominal area The nominal area is computed as follows La WE ore 1 A S r 100 A P b 100 A Where A is the absolute area as computed in equation 1 Aom 18S the nominal area Lanom 18 the nominal length of the deposit first numerical parameter of device type VV is the nominal width of the deposit second numerical parameter of device type nom F cq 1S the area fill percentage 100 indicates rectangle or square 79
28. ons the X dimension of the search region within which the deposit is expected to lie Specifically this is the X dimension of the green box that surrounds the image of the deposit Search Area X of course may or may not be the horizontal dimension as this is dictated by orientation which is a CAD parameter in the plx file see description of Paste Size X um parameter above Search Area X would typically be larger than Paste Size X e g 130 150 of the size Search Area X may be changed by the user within a predefined tolerance and will take effect the next time the board deposit is inspected Specifically the predefined tolerance is based on the nominal X size Paste Size X of the deposit The tolerance range is 150 300 of the Paste X Size Search Area Y um Search Area v Um 20560 This identifies in microns the Y dimension of the search region within which the deposit is expected to lie Specifically this is the Y dimension of the green box that surrounds the image of the deposit Search Area Y of course may or may not be the 5186 5190 A O Agilent Technologies 5186 5190 vertical dimension as this is dictated by orientation which is a CAD parameter in the plx file see description of Paste Size Y um parameter above Search Area Y would typically be larger than Paste Size Y e g 130 150 of the size Search Area Y may be changed by the user within a predefined tolerance and will take effect
29. others may be chosen see Figure 9 A search can be performed on any attribute of a paste deposit click on the arrow to the right of the Of Type text box to reveal a menu allowing any of these attributes to be chosen as the as part of the search criteria see Figure 9 The algorithm editor can be launched by right clicking any of the found items associated with a search on either reference designator part number or device type 5186 5190 A Agilent Technologies 5186 5190 Containing Test allows the user to specify a text pattern to search for within the chosen category attribute see Figure 10 b The find tool can be closed by clicking on the close button El situated on the top right hand corner of the form Figure 8 Find Tool Button Of Tupe gat Reference Designator Fiducials Search EJ Standand Search OF Type Devio Typs Cord ai tere eit a Comraonent ID Deca Ties 2 1 ps 9048430481 DI Used I 171 pa 006 127071 O Used di EO ps 051 240605100 Used i i ps 1117405581 00 Uad Bi pa 17784076271 D Used Fi pa 2006 16618100 Used I pa DSSS 065 ff DO Led a l ps 65R41117F1 00 Led ii pa 1271202100 Lis d 1 in JEN er ae zi c Device Type zo Shape Part Number Sevoh Standand earch Seaich DI Type Device Typs Cancel Cort ai rere et p i Comp orant 10 lica Tip it pa SMEs SMF ON Used a J L pa 201270 00 Used 171 pa D
30. pper X Offset um Upper Offset urm 200 X Offset is computed in microns If the computed X Offset for a deposit is greater than this upper limit the paste deposit will fail for X Offset Specifically the reported error would be gt XOffset Typically this upper limit will be a positive value indicating that the computation is direction sensitive If the deposit fails for this reason one can tell that the deposit is offset in the positive X direction Lower X Offset um Lower Offset um 00 X Offset is computed in microns If the computed X Offset for a deposit is less than this lower limit the paste deposit will fail for X Offset Specifically the reported error would be lt XOffset Typically this lower limit will be a negative value indicating that the computation is direction sensitive If the deposit fails for this reason one can tell that the deposit is offset in the negative X direction Upper Y Offset um Upper v Offset um 200 Y Offset is computed in microns If the computed Y Offset for a deposit is greater than this upper limit the paste deposit will fail for Y Offset Specifically the reported error would be gt YOffset Typically this upper limit will be a positive value indicating that the computation is direction sensitive If the deposit fails for this reason on can tell that the deposit is offset in the positive Y direction Lower Y Offset um Lower Y Offset um 200 Y Offset is computed in
31. ssign Clicking this button will assign the currently selected reference designator to the currently selected device type Left click on the deposit you want to assign to a different algorithm This deposit can be got from either the inspection list or from the board tree Open up the algorithm editor and choose the algorithm type you want to assign the deposit to from the algorithm list Then press the assign button and you will get a dialog box asking you to confirm that you want to assign the deposit to this algorithm see figure 17 Press yes to complete the assignment process C Are ou sure you wantto assign location n1952 1 to Algorithm Type nd pa 2830644011 00al 2 Figure 7 Dialog box that must be confirmed to complete the assignment process 5186 5190 A Agilent Technologies 5186 5190 Global Paste Type Algorithm Ke Global Paste Algorithm pa 999949999999 The purpose of the global paste type is to allow certain parameters selected by the user to be applied to all paste types that currently exist in the board s database This saves the time and effort required to apply a similar parameter individually to all paste types in the database The global paste type is uniquely identified by its device type pa 9999X99991999 No such device type vvould normally exist on a board The term global paste type may be misleading as it seems to suggest that there is a physical type It is merely an abstract representation
32. the next time the board deposit is inspected Specifically the predefined tolerance is based on the nominal Y size Paste Size Y of the deposit The tolerance range is 150 300 of the Paste Y Size Nominal Height um Nominal Height urn 150 This 1s the expected height of the deposit This may be set by the user to be equal to the stencil thickness The purpose of this value is to allow a nominal volume to be computed for the deposit In much the same vvay as the area is expressed as a percentage of the nominal area the volume is also expressed as a percentage of the nominal volume Volume Fill Volume Fill od The volume reported by the system is expressed as a percentage of the nominal volume Logically the nominal volume 8 computed as the product of the nominal area and the nominal height However because there past deposits are rarely if ever in the from of a cuboid or a perfect cylinder we must allow for some compromise on the shape It is for this reason that the Volume Fill is used This allows one to reduce the nominal volume as if to model rounded edges or dome shapes etc The value may often be set through print process analysis and fine tuning with this parameter If the programmer is satisfied with the area computation and is satisfied with the choice of nominal height he she may use the volume fill to refine the model of the paste deposit 3D shape as generated by the printer Thus the nominal volume is computed as
33. umbers will reveal all of the reference designators associated with the part number To launch the device editor right click a part number from the list or a reference designator from its sub list and from the menu that appears select Edit Algorithm see Figure 3 b This will launch the Algorithm device editor Board PasteB K Board PasteBaAk E lt Trained FI ae Trained Lo es go Assigned By Shape A gt o Assigned By Shape 5 H Assigned By Fart Mo 5 i pt By Part No amp PO0558 lt 0889F1 00 o Popa E POSSEKITIFFIOO B POBSS lt 051 2F1 O H POSS lt 081 2F1 POF 241 524F1 00 Hl POFB281 524F 100 FPO 20 77871 O Bl POFE281 78F 100 Fl POS 206951 O Fl POS1 2X 0685100 F1 POSBSKOSHSFI 00 POSS 05581 00 FP 0164381 OF 1 O E P1O1 6381 0F 100 EPI FK 065871 00 H P111750558F100 EH P11434445F100 E P11434445F100 EH P12702032F100 P12702032F1 00 Fl PY 27030487 1 00 r PI 27083048F1 00 FP 524341 397F 100 E P1 52401 397F100 E P1524X2032F100 EPIS 24K2032F100 Fl PESTI 524F 100 H P16511524F100 a b Figure 3 a Expand Assigned By Part No by clicking the symbol beside it b Right click a part number in the list and select Edit Algorithm 5186 5190 A O Agilent Technologies 5186 5190 Board Tree gt Board Name gt Trained gt Assigned by Ref Des gt Edit Algorithm The second way to launch the Algorithm Editor from the Board Tree is to expand the
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