| 摘要 |
PURPOSE:To enlarge an aperture of a reflecting mirror by using a main reflecting mirror being common to a radio wave and a light beam, and a sub-reflecting mirror for reflecting a radio wave and making a light beam transmit through, and focusing simultaneously the radio wave and the light beam to other part on the antenna aperture center axis. CONSTITUTION:A target detecting device is provided with a main reflecting mirror 1 for reflecting a radio wave and a light beam, and a sub-reflecting mirror 2 for reflecting a radio wave and making a light beam transmit through, and an optical sensor 3 converts an incident infrared ray signal to an electric signal, and outputs it to a target detecting circuit 6. A feed horn 4 radiates a transmitting output from a transmitter-receiver 5, and also, leads an incident receiving power to the transmitter- receiver 5. The transmitter-receiver 5 outputs the transmitting output to the feed horn 4, also, converts a receiving power from the feed horn 4 to a receiving signal, and outputs it to the target detecting circuit 6. The target detecting circuit 6 outputs a target detecting circuit 6. The target detecting circuit 6 outputs a target detecting signal, when one of signals from the optical sensor 3 and the transmitter-receiver 5 exceeds some prescribed time. In this way, a size in the width direction of a device can be made small, and an aperture of the reflecting mirror can be enlarged.
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