Apochromatic rod lens relay system with reduced spherochromatism and an endoscope with improved relay system
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United States of America Patent
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Jan 21, 2025
Grant Date -
Aug 31, 2023
app pub date -
Feb 25, 2022
filing date -
Feb 25, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
An image relay system is presented that includes an opposing pair of rod lens assemblies positioned symmetrically with respect to a central airspace. The rod lens assemblies include a meniscus lens positioned immediately adjacent to a central airspace and with the convex surface facing the airspace, a first lens having positive optical power with a convex face positioned adjacent to the inner face of the meniscus lens, a rod lens adjacent to the first lens having positive power, and a second lens having positive optical power positioned adjacent to the rod lens, the relay system designed so that light across a broad spectrum come to a common focus, as well as correcting for spherical aberration across the broad spectrum. An endoscope employing this relay system is also presented.
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