Patent ID: 7525428

Claim:
An alarm apparatus comprising: an electric conductor disposed at a window pane; a voltage supply device that supplies a voltage to the electric conductor; a voltage detection device that detects the voltage of the electric conductor; a disconnection determination device that makes a determination regarding a disconnected state of the electric conductor based on the voltage of the electric conductor detected by the voltage detection device; an alarm determination device that determines whether or not to perform alarming based on a result of determination regarding the disconnected state of the electric conductor by the disconnection determination device; and an alarm device that performs the alarming based on the determination by the alarm determination device, wherein the alarm determination device has an alert mode of performing the alarming if the disconnection determination device determines that the electric conductor is in the disconnected state, and a pre-alert mode of refraining from performing the alarming if the disconnection determination device determines that the electric conductor is in the disconnected state.