| 摘要 |
PROBLEM TO BE SOLVED: To arrange a plurality of light emitting devices connected in series, and having polarity with wiring unentangling constitution in the distal end of endoscope. SOLUTION: LEDs 18A, 18B, and 18C are arranged in an annular ring shape in the distal end 11A of an almost circular endoscope insertion tube by surrounding an objective lens 21, and are connected in series in this order. An anode terminal A of the LED 18A is positioned on the cathode terminal K side of the LED 18B compared to a cathode terminal K, and an anode terminal A of the LED 18B is arranged so as to be positioned on the cathode terminal K side of the LED 18C compared with the cathode terminal K.
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