Automatic focus detector
专利汇可以提供Automatic focus detector专利检索，专利查询，专利分析的服务。并且PURPOSE: To make possible the automatic focus detection by way of an objective system by receiving the reflected image light of the mark image on the subject by the detecting mark image moving on an optical axis thereby performing focus adjustment.
CONSTITUTION: The detection mark image which the lighting light of a mask 32 by a light source 31 forms and reciprocates on the optical axis is reflected by an infrared ray prism 33 which is excited by an exciter 40, after which it is formed on the field lens 21 of the objective optical system through a projecting lens 34, holed mirror 35 and mirror 30. This image light forms the mark image on the subject eye fundus Ef through the taking lens 4 of the objective system, a focusing lens 3 moved by a servo-driving system 42 and an objective lens 1 The reflected image light is received by a photoelectric transducer 38 by way of an imaging lens 36 by reverse-advancing in the optical system and the position of the lens 3 is controlled by a processing circuit 41 which controls the exciter 40 and driving system 42, so that the output of the element 38 becomes maximum every time when the prism 33 passes the reference point, whereby the automatic focus detection is accomplished without any hindrance even when the eye to be examined approaches to the objective system by way of the objective system.
COPYRIGHT: (C)1980,JPO&Japio，下面是Automatic focus detector专利的具体信息内容。
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