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Auto focimeter instrument used to measure the optical parameters of the lens , which is the essential instrument of the eyewear industry . LCD , micro printer automatically powers instrument usually by the optical system , precision machinery , photoelectric detection device ( usually a CCD sensor ) and electrical control components , optical , mechanical, electrical , and other aspects of knowledge , development difficulty . In recent years , the domestic enterprises , and make unremitting efforts to change the foreign auto focimeter dominate the market situation , occupies a large market share , but in the high - end devices on the market , is still hard to find a trace of the domestic product . The subject reference today automatically the mainstream technology focimeter seriously study the optical principle , on this basis , automatically the algorithm focimeter principle and conduct research . This paper first describes the current situation with inadequate of our focimeter market , key background knowledge of the works automatically focimeter DSP chip and CCD image sensor ; then combine theoretical basis , the overall program design , system design Han Guang Road , mechanical system design and the design of the electrical system ; next focus on the implementation of the hardware and the software . In hardware design , the design of the data acquisition system and data processing system design ; software design , start the program design , driver , measurement procedures , and feature-rich application design . Finally , a prototype developed in conjunction with the present subject , measurement results , and the problems do a brief analysis . The results show that , based on the DSP and dual- CCD automatic focimeter for accurate measurement , fast , stable performance , low cost . At the same time the feature-rich applications for the use of the device is very convenient , oriented topics to lay a solid foundation .
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