| 摘要 |
An electronic endoscope apparatus uses a circuit board having a cavity for achieving a predetermined electrical insulation. The apparatus includes a patient circuit on the side of the electronic endoscope, an output circuit for performing a predetermined image processing, and an isolation device for maintaining a predetermined dielectric strength between the two circuits; and the cavity is formed on one circuit board where the isolation device is disposed extending over the cavity. Further, the cavity is extended outward by a predetermined length so that signal lines on the two sides to be connected to the isolation device are positioned with a distance from each other on the circuit board by which a predetermined dielectric strength may be maintained. Thereby, current detouring through the circuit board may be effectively prevented and it is possible to isolate the patient circuit and the output circuit from each other also on the circuit board.
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