Coherent Machine Vision Lasers 3 D Triangulation Key

Coherent Machine Vision Lasers 3 D Triangulation – Key Success parameters CONFIDENTIAL

Agenda • Coherent Overview • 3 D Triangulation Overview • Properties of Structured Light • Key Success Parameters • Uniformity Highlight Superior Reliability & Performance COMPANY CONFIDENTIAL P. 2

Coherent – The Photonics Company Provider of Photonics Solutions - Primarily Lasers for Commercial and Scientific Research Applications • Founded in 1966 • TTM Sales $788. 4 Million Revenue Mix TTM 14% OEM Components & Instrumentation Materials Processing 48% 19% Microelectronics 19% • TTM Orders $799. 3 Million • 2, 328 Employees Scientific Research & Gov. Programs Geographic Sales Distribution TTM • Sales 24% U. S. and 76% International Europe United States • Approximately 387 Patents, 114 Pending __________ Note: Photonics is the Merger of Lasers, Optics and Electronics Source: Company management as of 6/30/12 Superior Reliability & Performance Asia Pacific COMPANY CONFIDENTIAL R. O. W. P. 3

Diversified Product and Applications Core Markets Microelectronics Primary Application Focus FPD, API, Semi, Solar Materials Processing Marking, Engraving, Cutting and Welding OEM Components Instrumentation Scientific Research & Government Programs Diagnostic & Therapeutic Medical, Defense and Display Ultrafast Growth vs Market SAM Position 1 2 to 4 1 1 Growth Opportunities OLED, Smartphones, Tablets High Power Materials Processing Laser Eye Care Attosecond Physics Superior Reliability & Performance COMPANY CONFIDENTIAL P. 4

3 D Machine Vision • In today’s world of expanding 3 D vision systems, the camera and laser are equal partners in the accuracy, stability and repeatability of the measurements made and used by the applications. • The requirements on the laser for power, pointing and electrical stability are far above a typical illumination system requirements. • Having a source which produces very high power density, very thin measurement cross sections with a uniform return that does not mask the profile of the object is critical to success in these demanding applications. Superior Reliability & Performance COMPANY CONFIDENTIAL P. 5

Structured Light Applications • Weld Seam • Glue Bead • Gasket seals • Soldier Paste • BGA • Wood Primary and Secondary processing • Food portioning/sorting • Packaging • Tire – Wall and Tread • Wheel alignment • Alignment guidance • Bottle Superior Reliability & Performance • PCBA post assembly • Rail car • Rail track • Road / Tunnel • Rail Brakes • Contour measurement • Steel / Extrusion • 3 D Reconstruction • Bin Picking • Non Contact Surface Profile COMPANY CONFIDENTIAL P. 6

3 D Triangulation • Projecting a narrow band of light onto a threedimensionally shaped surface produces a line of illumination that appears distorted from other perspectives than that of the projector, and can be used for an exact geometric reconstruction of the surface shape. Superior Reliability & Performance COMPANY CONFIDENTIAL P. 7

3 D Triangulation - Which Triangulation Setup? - Which 3 D Camera? - Which Line Laser? - Which Objective Lens? Superior Reliability & Performance ? ? ? COMPANY CONFIDENTIAL P. 8

3 D Triangulation Essential Information Needed: The Basic Parameters of the Application -Object Size (Width, Height and Length) -Required Scan Accuracy in X-, Y- and Z-Dimension -Scan Speed mm/s L -Type of Application -Type of Material H W Z Y X Superior Reliability & Performance COMPANY CONFIDENTIAL P. 9

3 D Triangulation Which Triangulation Setup? -Standard Setup -Sheet-Of-Light Plane vertical to the scan direction Y -All points of a height profile have the same Y-coordinate -dz=dx/sin(α) α Scan direction Sheet-Of-Light Plane Z Y Scan direction X Superior Reliability & Performance COMPANY CONFIDENTIAL P. 10

Example Calculation d. Z vs Tringulation angle -Standard 500 mm WD 30 FA 1280 Pixel 1400 1200 d. Z resolution in um 1000 800 600 400 200 0 MAX TRSH COG 10° 1215 607 304 20° 617 308 154 30° 422 211 105 Superior Reliability & Performance 40° 328 164 82 50° 275 138 69 60° 244 122 61 70° 224 112 56 COMPANY CONFIDENTIAL 80° 214 107 54 November 25, 2008 P. 11

Example Calculation d. Z vs Tringulation angle -Standard 150 mm WD 30 FA 1280 Pixel 400 350 d. Z resolution in um 300 250 200 150 100 50 0 MAX TRSH COG 10° 360 180 90 20° 183 91 46 30° 125 63 31 Superior Reliability & Performance 40° 97 49 24 50° 82 41 20 60° 72 36 18 70° 67 33 17 COMPANY CONFIDENTIAL 80° 63 32 16 P. 12

3 D Triangulation Alternative Triangulation Setups: Reverse Geometry -Advantage: Increased height resolution dz=dx/tan(α) -Drawback: Points of a height profile have different Y-coordinate -Suitable For Plane Objects α Scan direction Z Sheet-Of-Light Plane Y Scan direction X Superior Reliability & Performance COMPANY CONFIDENTIAL P. 13

3 D Triangulation Alternative Triangulation Setups: Specular Geometry -Advantage: Highly increased height resolution dz=dx*cos(β)/sin(α+β) -Advantage/Drawback: Increased image intensity due to direct reflexion -Drawback: Points of a height profile have different Y-coordinate -Suitable For Plane Objects α β Scan direction Z Sheet-Of-Light Plane Y Scan direction X Superior Reliability & Performance COMPANY CONFIDENTIAL P. 14

3 D Triangulation Alternative Triangulation Setups: Look-Away Geometry -Advantage: Reduction of direct light reflexions -Drawback: Reduced height resolution dz=dx*cos(β)/sin(α-β) β α Scan direction Z Y Sheet-Of-Light Plane Scan direction X Superior Reliability & Performance COMPANY CONFIDENTIAL P. 15

3 D Triangulation Angle α The bigger the triangulation angle: -the higher the Z-Resolution -the bigger the occlusion Ω Example: 5 mm tall object α = 40 degrees Occlusion (Ω) is 4. 2 mm Superior Reliability & Performance Occlusion: Edge Height * tan(α) COMPANY CONFIDENTIAL P. 16

3 D Triangulation FOV & Z-Range Trapezoidal shape is due to lens view angle Z-Range Superior Reliability & Performance COMPANY CONFIDENTIAL FOV (nominal) P. 17

Key Success Parameters • Uniformity • Poor uniformity in the reflected wave front can results in reduced accuracy and limitation on measurement resolution • Pointing Stability • Temperature dependent pointing effects the accuracy of the calibration and system accuracy • Straightness • A curved or bowed line limits the measurement window of the item being measured • Bore-sight • Poor Bore sight increases the installation time and risk of system mis-alignment • Power Stability • Directly effects the measurement sensitivity for any thresholding or low contrast measurements Superior Reliability & Performance COMPANY CONFIDENTIAL P. 18

Properties of Structured Light • Uniformity • Straightness • Line Width • Depth of Field • Divergence • Field dependent focus (“Bowtie”) Superior Reliability & Performance COMPANY CONFIDENTIAL P. 19

Properties of Structured Light Uniformity IMax Straightness IAvg 80% Clip Point RI floor IMin Superior Reliability & Performance COMPANY CONFIDENTIAL P. 20

Properties of Structured Light Beam Size D Depth of Field WD WD = working distance M 2 = M squared of diode D = Diameter of beam on collimator Superior Reliability & Performance COMPANY CONFIDENTIAL P. 21

Properties of Structured Light Divergence Field dependent focus WDθ Superior Reliability & Performance θ COMPANY CONFIDENTIAL WD P. 22

Uniformity Highlight • Side by side comparison of competitors line and Sting. Ray line • A – 50 m. W 660 nm (Competitor) • B – 35 m. W 660 nm (Sting. Ray) • Uniformity variations can be interpreted as features by the software • Poor management of power density in the line, effect is need for more power to get the same SNR = Higher cost, Higher Safety classification A B B Superior Reliability & Performance COMPANY CONFIDENTIAL P. 23

Uniformity Highlight A Line A Plot Superior Reliability & Performance Line B Plot COMPANY CONFIDENTIAL P. 24