Endoscopic television apparatus

Details Endoscopic television apparatus Endoscopic television apparatus

1981-10-19

1984-10-09

Coven, Edward M.

Surgery

Truss

Perineal

358 98, A61B 106

Patent

active

044755392

ABSTRACT:
An optical filter member composed of a plurality of ND filters having different transmission factors and arranged circumferentially at regular intervals is disposed between a light source and a light guide of an endoscope. When the optical filter member is rotated, a light beam with periodically varying luminance is transmitted through the light guide to illuminate an object inside a body cavity. Images of the object corresponding to different luminances are converted severally into video signals by a television camera. A signal component within a given level range is extracted from each of these video signals by a limiter. The signal components of the video signals are composed into video data to be supplied to a display. The display indicates the video data as an image with proper contrast.

REFERENCES:
patent: 2593925 (1952-04-01), Sheldon
patent: 3136310 (1964-06-01), Meltzer
patent: 4185295 (1980-01-01), Hess et al.
patent: 4261344 (1981-04-01), Moore et al.
patent: 4277168 (1981-07-01), Oku
patent: 4331132 (1982-05-01), Mukasa
Patent Associated Literature, "Hardy Endoscope Color TV System Using New Chalnicon Pickup Tube", Fukui and Hosoi, May/Jun. 1975.

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