Endoscopic observation system
First Claim
1. An endoscopic observation system, comprising:
- an optical image pickup system having an objective lens of a variable observation distance to pick up images of a subject through an observation window provided at a distal end of an endoscopic insertion instrument;
an illumination system having at least a couple of illumination means located on the opposite sides of and substantially in the same plane as said observation window of said optical image pickup system;
said illumination means each having a light guide and an illumination lens for diverging illuminating light from said light guide toward a subject under examination;
said illumination means on the opposite sides of said observation window being located in positions spaced from said observation window by such a distance as to hold illuminance in peripheral portions of an imaging area of said subject to a level lower than 200% of an illuminance level in a center portion of said imaging area at the time of observation from a minimal observation distance of said objective lens.
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Accused Products
Abstract
An endoscopic observation means having least a couple of illumination means are provided at a distal end portion of an endoscopic insertion instrument, the illumination means being on the opposite sides of and substantially on the same plane as an optical image pickup means. Each one of the illumination means includes a light guide for transmitting on illumination light from a light source, and an illumination lens for dispersing illumination light over an imaging area of a subject under observation. Further, the endoscopic observation means includes an objective lens system having a variable observation distance. The illumination means on the opposite sides of the observation means are spaced apart from each other by such a distance as to hold illuminance in peripheral portions of an imaging area of the subject to a level not greater than 200%, preferably, in the range of 200% to 120% of an illuminance level in portions of the imaging area.
39 Citations
10 Claims
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1. An endoscopic observation system, comprising:
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an optical image pickup system having an objective lens of a variable observation distance to pick up images of a subject through an observation window provided at a distal end of an endoscopic insertion instrument;
an illumination system having at least a couple of illumination means located on the opposite sides of and substantially in the same plane as said observation window of said optical image pickup system;
said illumination means each having a light guide and an illumination lens for diverging illuminating light from said light guide toward a subject under examination;
said illumination means on the opposite sides of said observation window being located in positions spaced from said observation window by such a distance as to hold illuminance in peripheral portions of an imaging area of said subject to a level lower than 200% of an illuminance level in a center portion of said imaging area at the time of observation from a minimal observation distance of said objective lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification