Patent ID: 6932760

Claim:
An optical coupler comprising: a lens holder containing a plurality of lenses disposed along an optical axis; a lens rider containing the lens holder, the lens rider having a first end and a second end; a transparent cover attached to the first end of the lens rider to seal the first end from moisture intrusion; a window holder having a first portion and a second portion, the first portion of the window holder having a transparent cover sealing the first portion from moisture intrusion, the second portion of the window holder attached to the first end of the lens rider so as to hermetically seal the interior of the lens rider; a condensation-inhibiting gas inside the hermetically sealed lens rider; an endobody, at which an endoscope can be coupled to the lens rider, attached to the first end of the lens rider; a focus tube containing at least a portion of the lens rider; a cam body disposed about the focus tube, the cam body having a helical groove disposed therein; a roller disposed within the helical groove in the cam body; a member disposed through a hole in the roller and having a first portion attached to the focus tube and a second portion attached to the lens rider; a focus ring surrounding the cam body to turn the cam body and the focus tube about an optical axis of the optical coupler; and a camera-mount nut attached to the focus tube to constrain the focus ring on the cam body and capable of coupling a camera to the focus tube.