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Fast automatic lens testing for extended-field image quality.

W T Plummer

    Applied Optics
    |February 19, 2010
    PubMed
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    A new hardware test using modulation transfer function (MTF) effectively monitors lens quality for high-volume manufacturing. This method efficiently assesses image quality and identifies defects like field tilt and curvature for automatic acceptance testing.

    Area of Science:

    • Optical engineering
    • Manufacturing quality control
    • Image science

    Background:

    • High-volume lens manufacturing for instant photography demands efficient quality control.
    • Existing methods struggle to balance picture quality relevance with automatic testing suitability.
    • Lens defects like field tilt and curvature impact image quality but can be corrected by refocusing.

    Purpose of the Study:

    • To develop an acceptance criterion for high-volume lens manufacture relevant to picture quality.
    • To establish a hardware test suitable for automatic lens testing.
    • To identify key parameters for a lens figure of merit.

    Main Methods:

    • Utilizing modulation transfer function (MTF) hardware testing.
    • Focusing on single-frequency modulation measurements at multiple field locations.

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  • Interpreting measurements in terms of root-mean-square (rms) blur of the point spread function.

    • Main Results:

    • A single-frequency modulation measurement adequately defines MTF for low spatial frequencies.
    • The proposed test can evaluate image quality over an extended field.
    • The method is suitable for identifying predominant manufacturing defects like field tilt and curvature.

    Conclusions:

    • A practical hardware test based on MTF can be implemented for 100% lens acceptance testing.
    • The described instrumentation provides a useful figure of merit for lens quality.
    • This approach ensures relevant picture quality assessment in high-volume manufacturing.