Electrocopying apparatus
专利汇可以提供Electrocopying apparatus专利检索，专利查询，专利分析的服务。并且PURPOSE:To develop always stable images by controlling the quantity of radiation light of originals based on the surface potential detection output of the portions corresponding to a reflecting plate position having a fixed density. CONSTITUTION:A standard white color plate 80 mounted near an original platen glass 54 immediately before exposing the original is radiated with an original-exposure halogen lamp 46 and the scattering and reflecting light thereof is radiated to a drum 47 via mirros 44, 53, 55 and lens 52, etc. With this quantity of radiation light as a standard quantity of light, the sensitivity quantity of the time of actually exposing the original by moving a lamp 46 is changed to the exposure which the operator has arbitrarily set. A surface electrometer 67 measures the surface potential VL of the portion where the scattering reflected light of the drum 47 is radiated and the value adding +50V to this is made the developing bias voltage VM. As a result, the potential of the toner becomes approximately equal to the bias voltage and since the toner does not deposit on the drum, fog of the original background portions may be prevented and developing of stable images accomplished.，下面是Electrocopying apparatus专利的具体信息内容。
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