lugiht-guide-design-method-provided-by-speos演示課件

1、.OverviewLineshapedlitappearanceisachievedbythisopticalelement.Ifithasnoprismnolightcanbeextractedjustkeeppropagating.(It’sjustarod)Theeffectofprismistomakeincidentanglesmallerthancriticalangle.Thensomepartoflightisextra

2、cted.Optimalshapeofprismdependsonstylingregulation..Lightpathdirectionofextractedlightcanbechangedbyprismangle.Variationofextraction1reflection2reflection2(me)refraction1reflection.Generallysomepartoflightgoesoutfrompris

3、mside.Indertomakeitbackinlightguidemirrwhitematerialislocatedatprismside.Loss.LightguideDesignInteractivesimulationisveryusefulflightguidedesign.Themostimptantthinginlightguidedesignistoobservetherayscarefully.Youcanunde

4、rsttowhichdirectiontheraysareextractedunifmityofyourlightguideapproximately.Ofcourseyouneedtomakedirectsimulationafteritfpreciseevaluation.Stylingofthelampisdifferenteverytimethismeansoptimalshapeofprismisalsodifferentev

5、erytime.Buttherearesomebasicrulescanbeusedinlightguidedesign.We’regoingtolearntheminfollowingexercises.Itisrecommendedtoincreasethenumberofraysfinteractivesimulationsothatyoucanunderstthesituationcrectly.(Defaultnumberis

6、100).PreparationOpticalAxisCreatelightguidewithinputelements(greenlines).Becarefulofdirectionofyellowarrows.Setparameterslikebelowasstartingvalue..40degExtracttherayintothedirectionof40deg.LED.Thisistheeasiestsituationbe

7、causedirectionofextractedraytendstobeshiftedtopropagatingdirection.Youneedtochangeendangleofprismifyouwanttochangethedirectionofray.PropagatingdirectionLEDChecktheresultwithdirectsimulation.creation15minChangeendanglefin

8、dthevaluewhichextracttheraysintorightdirection..0degExtracttherayintothedirectionof0deg.LED.Youcanchoosetwotypesoflightpath.2(me)refraction1reflection2reflectionHighefficiencyCanbedifficultfmoldingLessefficiencyEasyfmold

9、ingWhenyouincreasethevalueofendanglefromexercise1youwillachievefigure“A”.Thisisnomethelightpathofsinglereflection.Figure“B”iscompletelydifferentideawhichusesdoublereflection.“A”isbetterintermsofefficiencybutshapeofprismb

10、ecomehighpointed.Thesetwotypesofprismshapecanbesaidastheonewhichcanextractraysnmaltoguidecurve.Anglevaluescanbechangedaccdingtostylingsourcelocationbutit’snotsofarfromtheonesinleftfigures.Youcanusetheseshapesasstarting.C

11、reatebothtype.Thenchangethevalueslightlycheckhowitwks.ABLEDChecktheresultwithdirectsimulation.creation15min.20degExtracttherayintothedirectionof20deg.LED.HighefficiencyCanbedifficultfmoldingABLowefficiencyEasyfmoldingIde

12、aisthesameasexercise2.Increasethevalueofendangle.Incaseof“A”startangleisdecreasedindernottobetoopointedshape.Staranglealsohaseffecttothepathofrays.Becarefulwhenyouchangestartangle.Observetherayswithinteractivesimulation.

13、Thissituationisthemostdifficultflightguide.Lesscapabilitytocontrolraysmerayswasted.Createbothtype.Thenchangethevalueslightlycheckhowitwks.LEDChecktheresultwithdirectsimulation.creation15min.Nowyouknowthebasistocontrolthe

14、directionofextractedrays.youcanalsounderstbetterlocationofLEDs.insideoutsideYouhavetoaimthisdirectionfregulation.RearlampWhichlocationofLEDsmakesiteasytodesignyourlightguide.BrightDarkLargenumberofraysSmallnumberofraysVE

15、ResultInteractiveSimulation(Youcanestimatetheunifmityofyourlightguide.)Makeitunifm..MajpartofraysareextractedinnearareafromLED.Getbacktothebasis…WhyaretheseraysextractedAnswer:Duetoprisms.Question:Howcanyoureducethenumbe

16、rofraysextractedinneararearfromLED.Themostefficientwaytoreducetheamountofextractedraysishidingprismswith“offset”parameter.Indertomakeitunifmyouneedtohideprismsatthebeginningtokeepraysinsidelightguideusewholeshapeofprisma

17、ttheendtoextractmerays.Youhavetousedesigntabletoachieveit.Ifyouchangethevalueofoffsetin“Constant”modeitmakesjustdecreaseofwholeefficiencyunifmityisnotimproved..131313AccdingtoVEresultthelast13partoflightguideisdark.Thewh

18、olenumberofprismsis240soyoucanunderstyouhavetobegintochangeparametersataround160thprism.Ifyouchangetheparametersuddenlytheresultwouldbechangedsuddenlyaswell.It’sbettertochangethisparametergradually.??????Theplaceyoustart

19、tochangetheparameterthegradientofparameterdependonstylinghowyouwantitlookslike.Inthisphaseyouhavetomakesomeiterations.iteration30min.Thispartbecamewse.Itseemswellextractedininteractivesimulation.Insuchcaseraysfromsomepri

20、smsarenotextractedintocrectdirection.Addingcurvatureonprismsisusefulbecauseyoucanmakespreadthankstoit.Partofraysinthespreadwouldbeintocrectdirectionmakeyourlightguidemeunifm.thiscurvaturealsohelpsthebrightnessoffarareafr

21、omLED.Ofcourseyoucanmodifyeachprismangleindividuallybutit’scomplicatedsousingcurvatureiseasywaytomakesome“tuning”flitappearance.Convexconcaveisdefinedbypositivenegativevalueofcurvature.Behaviisdifferentaccdingtoconvexcon

22、cave.Youneedtotrybothchooseappropriateonethenmodifythevalueofcurvature.1416Wewanttomakeitevenbetterifpossible..Itbecamemuchbetterthanbeginning.ButtherearestillhotspotatthenearareafromLED.Tomakeitevenbetteryouneedtoaddspe

23、cificstructuretexturetospreadtheraysatthebeginningoflightguide.it’sgoodifyoucanhidebeginningofyourlightguide.It’sthemostsimpleway.Anywaywedon’tgoanyfurtherit’sbeyondOSDparameters..RemovemodeIdeasfcontrollingthedirectiono

24、fextractedraysunifmityarethesameas“add”mode.Becarefultosetappropriatevaluesftheoffsetparameter.Nomaterialwillberemovedfromthebodyiftheoffsetistoohigh.(Notice)“Start”“End”areinverted.Becauseit’screatedbysubtractingprismsf