| 摘要 |
PURPOSE:To compensate a shift in the image formation position of an image forming lens due to temperature variation by moving a light transmission wedge optical system with an electric signal corresponding to the temperature of a point nearby the image forming lens. CONSTITUTION:An airframe is constituted of a guidance device A, a steering wing controller 9, and a steering wing 10. In the guidance device A, the image forming lens 1 forms an image of incident infrared light on the photoelectric conversion surface of an infrared image pickup sensor 5. The light transmission optical system is fixed on the image formation optical path of the image forming lens 1. When the rising of the temperature of the point nearby the image forming lens 1 is detected by a temperature sensor 6, a wedge position controller 7 moves the light transmission wedge optical system 4 corresponding to the output of the temperature sensor 6 to increase the length of the passing optical path, thereby eliminating a shift in the image formation position.
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