Endoscopic illuminating and imaging systems and methods
View Patent ↗The present disclosure generally pertains to endoscopes configured to utilize a single optical channel for both image extraction and illumination. In certain embodiments, the disclosure contemplates an endoscope configured with a source of illumination outside of the visible spectrum, such as ultraviolet (UV) light, with the endoscope configured to down-convert such illumination into visible light at the distal end of the endoscope. This configuration not only avoids or reduces image flooding caused by the unwanted reflections on optical surfaces within the endoscope relays and objective, but also doubles the effective area of the lenses, thereby allowing higher quality imaging.
1. A method of transmitting illumination light and an object image through a single optical channel of an endoscope, the method comprising:
arranging a light source to direct light onto a first mirror located within the optical channel, the first mirror being visible light transparent and ultraviolet light opaque,
arranging the first mirror to reflect an ultraviolet light portion of the light distally through a lens of a relay lens system and an objective of the optical channel,
converting the ultraviolet light portion to visible light at a distal end objective and directing the visible light onto an object, and
receiving an object image of the object and transmitting the object image proximally through the objective and the lens of the relay lens system,
wherein the objective is arranged distally to the relay lens system and the light source.
2. The method according to claim 1 comprising transmitting the object image through the first mirror.
3. The method according to claim 1 comprising arranging the ultraviolet light portion to converge within the lens of the relay lens system away from image forming surfaces of the lens of the relay lens system.
4. The method according to claim 1 comprising arranging a second mirror within the objective to receive the ultraviolet light portion from the first mirror and reflect the ultraviolet light portion proximally, the second mirror being visible light transparent and ultraviolet light opaque.
5. The method according to claim 4 comprising arranging a third mirror to receive the ultraviolet light from the second mirror and reflect the ultraviolet light distally, the third mirror having a central aperture therethrough.
6. The method according to claim 5 comprising arranging a fourth mirror to receive the ultraviolet light from the third mirror, the fourth mirror being ultraviolet light transparent and visible light opaque.
7. The method according to claim 6 wherein the ultraviolet light portion that passes through the fourth mirror is converted to the visible light and directed onto the object.
8. The method according to claim 7 comprising transmitting the object image distally through the second mirror, a central aperture of the fourth mirror, the central aperture of the third mirror and the first mirror.