Ultrathin image fiber with hemispherical fiber lens for medical use

Naoki Shamoto; Ken-ichi Nakatate; Takashi Tsumanuma

doi:10.1117/12.271015

18 April 1997 Ultrathin image fiber with hemispherical fiber lens for medical use

Naoki Shamoto, Ken-ichi Nakatate, Takashi Tsumanuma

Proceedings Volume 2977, Specialty Fiber Optics for Biomedical and Industrial Applications; (1997) https://doi.org/10.1117/12.271015
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

The gradient-index rod lenses have been conventionally used as the objective lens of the ultrathin medical fiberscope. In this paper, we propose to apply the new hemispherical fiber lens for the ultrathin fiberscopes. The lens can be fabricated by attaching a silica rod to imagefiber and heating the free end of the rod in arc charge. As the result of our investigation, it has been known that the radius of the hemispherical lens can be controlled by the discharge time. The imagefiber with the hemispherical lens had a diameter of 0.2 mm, 1600 pixels, a working distance of 3 mm and the angle of view of 40 degrees. It has been found by evaluating its image quality that it has the sufficient feature for the practical medical usage. In addition, it has been shown that the end of the imagefiber itself can be transformed to the hemispherical objective lens, and its optical characteristics as a lens can be controlled by changing the elongating length and the preheating condition.

Citation Download Citation

Naoki Shamoto, Ken-ichi Nakatate, and Takashi Tsumanuma "Ultrathin image fiber with hemispherical fiber lens for medical use", Proc. SPIE 2977, Specialty Fiber Optics for Biomedical and Industrial Applications, (18 April 1997); https://doi.org/10.1117/12.271015

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