Projector device with theft prevention function and theft preventing method
First Claim
1. 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.
3 Assignments
0 Petitions
Accused Products
Abstract
X-direction double integrator 3 integrates twice an acceleration that is detected by x-direction acceleration sensor 1, estimating a traveled distance in an x direction. Y-direction double integrator 4 integrates twice an acceleration that is detected by y-direction acceleration sensor 2, estimating a traveled distance in a y direction. Detection boundary storage unit 5 stores a monitoring area. Detection boundary comparator 6 determines whether the projector device is positioned outside of the monitoring area or not based on the traveled distance in the x direction which is estimated by x-direction double integrator 3, the traveled distance in the y direction which is estimated by y-direction double integrator 4, and the monitoring area stored in detection boundary storage unit 5.
5 Citations
19 Claims
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1. A projector device with a theft prevention function, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A projector device with a theft prevention function, comprising:
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position detecting means for detecting a present position of the projector device; area input means for receiving a monitoring area; area storage means for storing the monitoring area received by said area input means; detecting means for detecting whether said projector device is positioned outside said monitoring area based on the present position of said projector device detected by said position detecting means and the monitoring area stored by said area storage means; a detecting process switcher that determines if the detecting means has determined if the projector device is outside the monitoring area and if the detected present position of the projector is outside of the monitoring area, the detecting process switcher recognizes that the projector is stolen, wherein when the detected present position of the projector is within the monitoring area, the detecting process switcher determines that the projector is not stolen. - View Dependent Claims (19)
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11. A theft prevention method for being performed by a projector device, comprising:
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detecting a present position of the projector device; receiving a monitoring area; storing the monitoring area received in said receiving of the monitoring area; detecting whether said projector device is positioned outside said monitoring area based on the present position of said projector device detected in said detecting of the present position of the projector and the monitoring area stored in said storing of the monitoring area; detecting whether there is electric power supplied from a power cable; and supplying electric power from a battery of the projector device to said position detecting unit, said detecting unit, and said alarm generating unit if said detecting of the electric power detects there is no electric power supplied from the power cable; detecting a voltage drop of said battery; and storing information representative of no supply of electric power in non-volatile memory when the voltage drop of said battery is detected in said detecting of the voltage drop, and outputting the information stored in said non-volatile memory when the electric power resumes being supplied from the power cable. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification