Patent ID: 7429930

Claim:
A projector device with a theft prevention function, comprising: a position detecting unit that estimates a traveled distance of said projector device, determines if the estimated distance is greater than a predetermined distance, and detects a present position of the projector device; an area input unit that receives a monitoring area; an area storage unit that stores the monitoring area received by said area input unit; a detecting unit that detects whether said projector device is positioned outside said monitoring area based on the present position of said projector device detected by said position detecting unit and the monitoring area stored by said area storage unit; and a detecting process switcher that determines if the position detecting unit has determined if the estimated travel distance is greater than the predetermined detection distance and if the detected present position of the projector is outside of the monitoring area, the detecting process switcher determines that the projector device is stolen, wherein when the estimated travel distance is greater than the predetermined detection distance and the detected present position of the projector is within the monitoring area, the detecting process switcher determines that the projector is not stolen.