Condensing optical system, confocal optical system, and scanning confocal endoscope
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United States of America Patent
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Mar 4, 2008
Grant Date -
Mar 10, 2005
app pub date -
Sep 3, 2004
filing date -
Sep 5, 2003
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Abstract
A condensing optical system, suitable for a scanning confocal optical system (having a composition for scanning a beam spot on a subject surface by swinging a point source of light) and capable of satisfactorily suppressing various aberrations and reducing loss of light quantity, is provided. The condensing optical system, installed in a scanning confocal optical system for obtaining images of a subject surface by scanning a beam emitted from a point source of light by moving the point source which serves as a pinhole for confocal observation, is configured to satisfy the following condition 0.1<|m.times.NA|<0.2 where 'm' denotes magnification of the condensing optical system and 'NA' denotes a numerical aperture of the condensing optical system on its subject surface side.
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