Capsule endoscope having an image sensor and a sensor for detecting a physical quantity and capsule endoscope system including the capsule endoscope

A capsule endoscope system comprising:

• a capsule endoscope;
• and
• a radio communication device,
• wherein the capsule endoscope includes:
• a sensor configured to detect a physical quantity;
• a first transceiver configured to wirelessly transmit sensor data representing the physical quantity to the radio communication device and wirelessly receive first data from the radio communication device periodically at intervals of a first time;
• a counter of which a count value increases or decreases from a reference value;
• a signal generator configured to generate an imaging synchronization signal on the basis of the first data and generate the imaging synchronization signal on the basis of a result of comparison between the count value and a first predetermined value;
• and
• an image sensor configured to perform imaging on the basis of the imaging synchronization signal,
• wherein the radio communication device includes:
• a second transceiver configured to wirelessly receive the sensor data from the capsule endoscope and wirelessly transmit the first data to the capsule endoscope periodically at intervals of the first time;
• and
• one or more processors configured to analyze the physical quantity on the basis of the sensor data and periodically generate the first data based on the physical quantity at intervals of the first time,
• the count value becomes the reference value when the imaging synchronization signal is generated,
• the signal generator is configured to generate the imaging synchronization signal when the count value becomes the first predetermined value or more in accordance with an increase of the count value from the reference value or when the count value becomes the first predetermined value or less in accordance with a decrease of the count value from the reference value,
• a second time that is necessary for the count value to change from the reference value to the first predetermined value is fixed or variable,
• the second time is longer than the first time in a case in which the second times is fixed, and
• the maximum value of the second time is longer than the first time in a case in which the second time is variable.