| 摘要 |
An optical device of the periscope type carried on a vehicle, comprising a sighting tube rotatably mounted in the vehicle, a driving member fixed to the vehicle for rotating the tube about its optical axis, and a reflector placed at the other end of the tube and rotatable about an axis orthogonal to the optical axis, further comprising a central unit for forming electrical voltages representative of the pitch angle and the roll angle of the vehicle, a first resolver the rotor of which is driven in synchronism with the sighting tube and the primary windings of which are connected to said central unit, a second resolver supplying a voltage representative of a pre-determined site angle, a third resolver the primary windings of which are respectively connected to one of the secondary windings of the first resolver and to said central unit, a feed-back loop for servoing the output voltage of said third resolver to the output voltage of said second resolver, and means for transmitting the displacement of the rotor of the third resolver to the axis of said reflector with a 2:1 ratio.
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