Endoscope including a front lens group and an inner lens group f

Details Endoscope including a front lens group and an inner lens group f Endoscope including a front lens group and an inner lens group f

1997-01-27

1999-04-06

Leubecker, John P.

Surgery

Endoscope

Having imaging and illumination means

600138, 600167, 359434, A61B 1002

Patent

active

058910158

ABSTRACT:
The invention is directed to an endoscope having an especially simple optical system within an endoscope tube 22. The imaging system of the endoscope tube includes a front group 25 having a negative refractive power and an inner group 28 having a positive refractive power. The front group 25 and the inner group 28 conjointly define a telescope system which permits the object plane 24 to be imaged in the intermediate image plane 32 without intermediate imaging at a distance of 200 mm to 600 mm from the distal end of the endoscope tube 22. Otherwise, only glass rods having planar-parallel end faces are mounted within the endoscope tube. A field optic is preferably a part of the viewing component. An adequate transmission and correction with respect to chromatic and monochromatic imaging errors is possible notwithstanding the simple optical configuration. The front group and inner group can also be configured as aspherical individual lenses. The endoscope is especially useable as a disposable endoscope because of the simple configuration of the optic.

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patent: 5632718 (1997-05-01), Igarashi et al.

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