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APDS-9005 Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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APDS-9005 Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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11 / 12 page  Appendix B: Optical Window Design for APDS-9005 2.0 Optical Window Dimensions ToensurethattheperformanceoftheAPDS-9005willnot beaffectedbyimproperwindowdesign,therearesome constraintsonthedimensionsanddesignofthewindow. Thereisaconstraintontheminimumsizeofthewindow, whichisplacedinfrontofthephotolightsensor,sothat itwillnotaffecttheangularresponseoftheAPDS-9005. This minimum dimension that is recommended will ensureatleasta±35°lightreceptioncone. Ifasmallerwindowisrequired,alightpipeorlightguide can be used.A light pipe or light guide is a cylindrical piece of transparent plastic, which makes use of total internalreflectiontofocusthelight. Thethicknessofthewindowshouldbekeptasminimum as possible because there is a loss of power in every optical window of about 8% due to reflection (4% on eachside)andanadditionallossofenergyintheplastic material. Figure B1 and B2 illustrate the two types of window thatwehaverecommendedwhichcouldeitherbeaflat windoworaflatwindowwithlightpipe. Table 1 and Figure B3 below show the recommended dimensionsofthewindow.Thesedimensionvaluesare basedonawindowthicknessof1.0mmwitharefractive index1.585. Figure B1. Window Size Determination for Flat Window Figure B2. Window Design of Flat Window with Light Guide Z L T D1 WD Top View D2 D1 APDS-9005 LightRecevingArea Figure B3. Recommended Window Dimensions WD: Working Distance between window front panel &APDS-9005 D1: WindowDiameter T: Thickness L: LengthofLightPipe D2: LightPipeDiameter Z: Distance between window rear panel and APDS-9005 Table 1. Recommended minimum dimension for optical window WD (T+L+Z) Flat Window (L=0.0) Flat window with Light Pipe Z D1 D1/D2 T/L/Z .5 0.5 .05 - - .0 .0 .5 - - .5 .5 3.45 - - 3.0 .0 4.5 .0/. .0/.5/0.5 Alldimensionsareinmm Thewindowshouldbeplaceddirectlyontopofthelight receivingarea(activearea)ofthephotosensortoachieve betterperformanceandifaflatwindowwithalightpipe isused,dimensionD2shouldbe1.2mmtooptimizethe performanceofAPDS-9005. Therecommendedminimumwindowdimensionisbased ontheassumptionthatthecenterofthewindowandthe centerofthelightreceivingofthephotosensorarethe same.Itisrecommendedthatthetoleranceforassembly be considered as well.The recommended minimum windowsizewhichwilltakeintoaccountoftheassembly toleranceisdefinedas: D1 (min + assembly tolerance) = D1min + 2*(assembly tolerance)(Dimensionsareinmm) D2 (min + assembly tolerance) = D2min + 2*(assembly tolerance)(Dimensionsareinmm) |
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Similar Description - APDS-9005 |
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