Patent ID: 8225792

Claim:
A mask device with blower, comprising: a face body; an exhaust valve provided on the face body and movable in an opening direction with respect to a first valve seat upon exhausting air and in a closing direction with respect to the first valve seat upon inhaling air, the exhaust valve having first and second positions away from the first valve seat, the second position being between the first position and the first valve seat; an inhalation valve provided on the face body and movable in a closing direction with respect to a second valve seat upon exhausting air and in an opening direction with respect to the second valve seat upon inhaling air; a blower configured to be driven by a motor for supplying external air to an inside of the face body through the inhalation valve; a control circuit; a warning unit; a first position sensor for blower control disposed in the vicinity of and in a non-contact state with respect to the exhaust valve for detecting a position of the exhaust valve; and a second position sensor for warning disposed in a non-contact state with respect to the exhaust valve and configured to detect a position of the exhaust valve, wherein the first position sensor is configured to output a first signal to the control circuit to stop or reduce power supply to the motor for driving the blower when the first position sensor detects that the exhaust valve is away from the first valve seat beyond the first position, the second position sensor is configured to output a second signal to the control circuit to stop operation of the warning unit that is connected to the control circuit when the second position sensor detects that the exhaust valve is away from the first valve seat beyond the second position, the first position sensor is configured to output the first signal to the control circuit to enable power supply to the motor for driving the blower when the first position sensor detects that the exhaust valve is between the first position and the first valve seat, and the second position sensor is configured to output the second signal to the control circuit to operate the warning unit when the second position sensor detects that the exhaust valve is between the second position and the first valve seat.