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Priority to JP16384476UpriorityCriticalpatent/JPS5380284U/ja
Publication of JPS5380284UpublicationCriticalpatent/JPS5380284U/ja
A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
A61B1/00163—Optical arrangements
A61B1/00174—Optical arrangements characterised by the viewing angles
A61B1/00177—Optical arrangements characterised by the viewing angles for 90 degrees side-viewing