Variable magnification endoscope Patent #: 4664486
ApplicationNo. 06/880777 filed on 07/01/1986
US Classes:359/379, Spacing of optical elements axially adjustable359/387, With annular lighting structure359/661Having less than four components
ExaminersPrimary: Punter, William H.
Attorney, Agent or Firm
International ClassesG02B 21/02 (20060101)
G02B 6/04 (20060101)
AbstractAn objective lens system having a pair of plano-convex lenses disposed adjacent each other with the convex surfaces facing each other and aligned along common optical axis. A plurality of optical fibers surround the plan-convex lenses to convey light and illuminate an object to be viewed by the objective lens assembly. Adjustably positioned adjacent the second plano-convex lens is a field lens system including an elongate rod lens for conducting the intermediate image from the plano-convex lenses and to relay it to an ocular lens system for viewing by the user.