Optical system for endoscopes

Details Optical system for endoscopes Optical system for endoscopes

1980-12-17

1984-01-10

Lee, John D.

350410, 350427, G02B 517

Patent

active

044250258

ABSTRACT:
A wide angle objective is located at the entrance face of a flexible image guide tube of an endoscope and a variable focal length eyepiece lens system is located at the exit face of the tube. The variable focal length eyepiece lens system includes an axially movable lens group which increases the magnification of the endoscope from the normal 20 times to about 40 times, in effect, increasing the magnification 20 times over the magnification potential of current endoscopes.

REFERENCES:
patent: 2987960 (1961-06-01), Sheldon
patent: 3576358 (1971-04-01), Hayamizu et al.
patent: 3637282 (1972-01-01), Hayamizu et al.
patent: 4101196 (1978-07-01), Imai
patent: 4269485 (1981-05-01), Yamashita et al.
patent: 4285578 (1981-08-01), Yamashita et al.
patent: 4312572 (1982-01-01), Yamashita et al.

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