Research On The Auto-Focusing Technology For Space Camera

Auto-focusing technique is one of the space camera's key technologies auto-focusing system is an important part of the space camera and a key module to ensure the imaging quality of the space camera. The conditions around the space camera are very complicated, such as impact, vibration, space temperature and air pressure. The space camera needs not only have excellent mechanical capability, but also have superior the capability of adapting surroundings capability, especially the adaptive capability to space temperature and air pressure. When the space camera works in orbit, the temperature fluctuates in a great range. The space camera has a thin skin to the change of the circumstances, especially to the change of temperature. Because of the changes of the surroundings, the camera's focusing plane will offset in different degree. In order to ensure the imaging quality of the space camera in complicated environment, the camera's focusing plane needs be modulated. So it is necessary to devise a system to adjust the place of the space camera's focusing plane .In this paper, auto-focusing mechanism the space camera been reach on.The project of focusing mechanism has been put forward on the basis of analyzing several factors departing from focus and contrasting different projects. In this article, the mostly contents are these: Introducing the principle of focusing mechanism, choosing materials, motor and coder, devising on focusing power and restricting place circuit, analyzing driving errors and clearance, computing the precision of the focusing mechanism. Lastly, experiments show that the focusing mechanism fits to the needs of the camera gaining good imaging quality.