An Enclosed variable focusing lens for remote welding
1 Hiroshima Institute of Technology, Department of mechanical engineering systems, 2-1-1 Miyake, Saeki-ku, Hiroshima 731-5193, Japan
2 Chiba Institute of Technology, Precision Engineering, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
3 Utsunomiya University Center for Optical Research & Education (CORE), 7-1-2 Yoto, Utsunomiya-city, Tochigi, 321-8585, Japan
a Corresponding author: email@example.com
In this study, a variable focusing lens with a driving mechanism was developed. The surface curvature of the lens is formed via the interaction of elastic film tension and liquid pressure generated by compression of a bellows, which enables the focal length to be changed. This paper discusses the optical characteristics of the lens system. The focal length range is 250 – 750 mm with beam diameters of 0.3 mm – 0.9 mm, respectively, when a YAG laser is irradiated. In the study, the lens system was applied to laser beam welding of mild-steel sheet with a thickness of 0.5 mm for 3,000 shots of laser irradiation at a peak power of 4.7 kW and a duration of 10 ms.
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