Mr. Henry Bai Profile

Henry Bai

Principal Optical Engineer at Prysm Inc

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Proceedings Article | 18 September 2007 Paper

Large-format telecentric lens

Hanxiang Bai, Samuel Sadoulet

Proceedings Volume 6667, 666705 (2007) https://doi.org/10.1117/12.734447

KEYWORDS: Sensors, Colorimetry, Lens design, Modulation transfer functions, Imaging systems, CCD image sensors, Monochromatic aberrations, Cameras, Geometrical optics, Signal to noise ratio

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Research and development efforts to improve the performance of telecentric lens design for large-format cameras are driven by the ever-increasing deployment of these types of systems into the industrial imaging arena. These lens designs typically have stringent requirements for contrast and resolution (>30% at 100lp/mm) across large sensor sizes (up to 90mm) while maintaining both object- and image-space telecentricity (0.1° object-space, 0.2° image-space). This paper explores various characteristics related to large-format telecentric lens designs and performance. In particular, details around advantages of afocal finite-conjugate imaging, mathematic expression for chromatic telecentricity, and desensitization of working distance variance are discussed with reference to geometric optics and aberration theory. Improvement of chromatic telecentricity and relief of requirement on image-distance accuracy are shown with graphics and MTF plots. Product parameter / performance data is provided as an example.

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