Ultra-wide to mid-wide angle 3X zoom and focus adjustable lens
design for industrial video endoscope

Dongmin Yang

doi:10.1117/12.999432

26 November 2012 Ultra-wide to mid-wide angle 3X zoom and focus adjustable lens design for industrial video endoscope

Dongmin Yang

Proceedings Volume 8557, Optical Design and Testing V; 85570P (2012) https://doi.org/10.1117/12.999432
Event: Photonics Asia, 2012, Beijing, China

Abstract

Optical zoom lens design for industrial video endoscope faces tremendous challenges in stringent compactness requirement in both diameter and rigid length dimensions, as well as harsh environmental requirements such as high working temperature. Industrial video endoscope with optical zoom capability is increasingly demanded by market yet nowadays no such product has been commercialized. Once it succeeds, it will provide huge benefits to customers in improvement of remote visual inspection work quality and productivity. A 3X continuous optical zoom lens design with short focal length is presented in this paper. It is capable to change Field of View from ultra-wide angle as 120degrees to mid-wide angle as 40degrees. Focus distance change is from infinity to as close as 5mm. The whole lens train has a maximum diameter of 3.0mm, and overall length of 8.7mm, which makes it practical to be integrated into a 6mm industrial video endoscope. Image quality in terms of contrast and resolution exceeds today’s existing commercial 6mm industrial video endoscopes. The design has also considered cost and product ruggedness requests.

Citation Download Citation

Dongmin Yang "Ultra-wide to mid-wide angle 3X zoom and focus adjustable lens design for industrial video endoscope", Proc. SPIE 8557, Optical Design and Testing V, 85570P (26 November 2012); https://doi.org/10.1117/12.999432

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KEYWORDS

Zoom lenses

Endoscopes

Video

Inspection

Image quality

Lens design

Modulation transfer functions

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