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40X 0.65NA Microscope Objective Tolerance Analysis

40X 0.65NA Microscope Objective Tolerance Analysis. Background. For a complete microscope design, tolerance analysis is a necessary process which including:. Determine the value of manufacturing and assembly tolerances. Determine the compensational component for manufacturing and assembly.

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40X 0.65NA Microscope Objective Tolerance Analysis

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  1. 40X 0.65NA Microscope Objective Tolerance Analysis

  2. Background For a complete microscope design, tolerance analysis is a necessary process which including: • Determine the value of manufacturing and assembly tolerances. • Determine the compensational component for manufacturing and assembly. • Determine the manufacturing and assembly yields.

  3. Specification and Tolerance Microscope Objective Specification and Tolerance Analysis Criterion • Magnification: 40X • Numerical aperture: NA 0.65 • Visible wavelength: DFC • MTF:0.63@450lp/mm, • Tolerance criterion: RMS spot, RMS wavefront, MTF. The tolerance for this lens is MTF >0.45.

  4. System Layout

  5. Polychromatic Diffraction MTF

  6. Tolerance Analysis with Solutions

  7. Analysis of Tolerances -Identify the Existing Issues Criterion: Diffraction MTF average S&T at 450.0000 cycles per mm Nominal Criterion: 0.63 Worst offenders: Type Value Criterion Change TSDX 7 0.02000000 0.40276905 -0.22645096 TSDX 7 -0.02000000 0.40276905 -0.22645096 TSDY 7 -0.02000000 0.40276905 -0.22645096 TSDY 7 0.02000000 0.40276906 -0.22645096 TSDX 6 0.02000000 0.44345454 -0.18576548 TSDX 6 -0.02000000 0.44345454 -0.18576547 TSDY 6 -0.02000000 0.44345454 -0.18576547 TEDY 5 7 0.02000000 0.45596137 -0.17325864 TEDY 5 7 -0.02000000 0.45596137 -0.17325864 TEDX 5 7 -0.02000000 0.45596138 -0.17325863 Estimated Performance Changes based upon Root-Sum-Square method: Nominal MTF : 0.63 MTF=0.047 Estimated change : -0.58201878 Estimated MTF : 0.04720123 Compensator Statistics: Thickness Surf 11: Preliminary conclusion lead our production team to focus on surface accuracy and elements wedge tolerance that might be the causes of production issues.

  8. Modify the Tolerance Data

  9. Repeat Analysis of Tolerance Criterion: Diffraction MTF average S&T at 450.0000 cycles per mm Nominal Criterion: 0.63 Worst offenders: Type Value Criterion Change TFRN 7 -5.00000000 0.56361483 -0.07021743 TTHI 10 11 -0.03000000 0.56707180 -0.06676045 TTHI 6 7 -0.03000000 0.60750372 -0.02632854 TFRN 6 5.00000000 0.60830201 -0.02553025 TSDX 7 -0.00500000 0.61591890 -0.01791336 Estimated Performance Changes based upon Root-Sum-Square method: Nominal MTF : 0.63 Estimated change : -0.09456633 Estimated MTF : 0.53926593 MTF>0.45 Compensator Statistics: Thickness Surf 11: MTF>0.45

  10. Monte Carlo Analysis: Number of trials: 10 Initial Statistics: Normal Distribution Trial Criterion Change • 1 0.63378092 -5.1336E-005 • 2 0.62090660 -0.01292565 • 3 0.61386375 -0.01996850 • 4 0.48238259 -0.15144967 • 5 0.61324670 -0.02058555 • 6 0.60359581 -0.03023644 • 7 0.58464931 -0.04918295 • 8 0.53216035 -0.10167191 • 9 0.63535256 0.00152030 • 10 0.60603088 -0.02780138 Number of traceable Monte Carlo files generated: 10 Nominal 0.63383226 Best 0.63535256 Trial 9 Worst 0.48238259 Trial 4 90% > 0.50727147 80% > 0.55840483 50% > 0.60963879 20% > 0.62734376 10% > 0.63456674

  11. Conclusion Tight active radius tolerance, irregularity tolerances, thickeness tolerance, and tolerance Nd /Vd (glass materials) can be achieved when using high end manufacturing equipment, but the wedge tolerance for component fabrication and assembly might be more challenging for production. To achieve the desired manufacturing objectives, the most commonly used method is ensuring the each individual optical component accuracy, followed by tightening the tolerance of the lens barrel (mechanical assembly) In short, Zemax tolerance analysis provides a very good guideline for our optical component manufacturing and assembly.

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