Olympus Medical Systems Corporation

Masao Akai

Takeshi Suga

Hiroaki Kinoshita

Atsushi Goto

Daisuke Akiyama

Akihito Miyata

Makoto Tanabe

Takuya Takechi

Shinji Egami

An endoscope includes an insertion portion including an image pickup section, an illumination section, and a light guide inserted inside the insertion portion, the light guide including a plurality of fibers made of a glass not containing lead, the plurality of fibers guiding illuminating light from a light source apparatus to the illumination section, the light guide having a numerical aperture of 0.46 to 0.90. A core glass of a fiber have a refractive index nd of 1.56 to 1.74, and a composition of (A) 20 to 55 wt % SiO, (B1) 0 to 4.0 wt % BO, (B2) neither POnor GeOcontained, (C) 25 to 72 wt % (BaO+SrO+LaO+LuO+TaO+GdO+WO), (D) 0 to 30 wt % ZnO, (E) no AlOcontained, (F) no ZrOcontained, (G) neither PbO nor AsOcontained, (H) 0 to 15 wt % (NaO+KO), (I) 0 to 0.050 wt % SbOand (J) 0.26 to 1.63 wt % (NaSO+KSO).

Endoscope

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Hachioji, Japan

Masao Akai