| 摘要 |
An electronic endoscope includes: a discharge voltage measuring circuit for measuring discharge voltage of a battery; a time-measuring circuit for measuring period of time for which the battery is used; a remaining available time estimating circuit for obtaining remaining available time t<SUB>r </SUB>of the battery based on the result of the measured discharge voltage obtained by the discharge voltage measuring circuit, the result of the measured time obtained by the time-measuring circuit, and a relation between discharge voltage and discharge time of the battery stored in a ROM; and a transmission device for transmitting the remaining available time t<SUB>r </SUB>to a processor unit. The processor unit includes: a receiving device for receiving the remaining available time t<SUB>r </SUB>from the transmission device; and an image processing unit for displaying a progress bar indicating the remaining available time t<SUB>r </SUB>of the battery outside a displaying area of an endoscopic image.
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