| 摘要 |
The invention provides an electric multi-layered infrared filtered anti theft device. The camera is responsive to visible and near-infrared spectrum by using a double-layered Infrared Filter. The first layer is a near-infrared filter for a monitoring device. The filter can be switched to in front of or behind the camera lens, in order to block visible light and allow near-infrared light to pass through, otherwise, both lights could come through. As for the second layer, its method uses a filter partition that is penetrate-able by infrared. When there is more visible light than near-infrared light, the camera is only responsive to visible light; when there is more near-infrared than visible light, the camera is only responsive to near-infrared. Having the advantages mentioned above, this device can take different pictures according to multiple different environments, in order to achieve secret and disguised monitoring.
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