Optical filter system for a video endoscope, display system and video endoscope
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United States of America
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Dec 17, 2024
Grant Date -
Apr 7, 2022
app pub date -
Oct 1, 2021
filing date -
Oct 1, 2021
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Abstract
An optical filter system and a video endoscope therefor are disclosed. The optical filter system is arranged in a distal end section of a shaft. At least one image sensor for receiving image light is positioned in the distal end section. The optical filter system contains an optical filter and an objective lens system with a three or more lenses to collect image light and to pass it to the image sensor. The filter has transmission characteristics that vary relative to the radial distance from its center and is located between the first lens and the second lens of the objective lens system. Used in conjunction with fluorescence imaging, emission radiation collected by the image sensor is substantially free of excitation radiation. Additionally, a display system clearly delineating the regions with reliable fluorescence and/or visible light is also disclosed.
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