Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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Filing date
Publication date
Application filed by Ricoh Co LtdfiledCriticalRicoh Co Ltd
Priority to JP15432575ApriorityCriticalpatent/JPS5289324A/en
Priority to US05/752,361prioritypatent/US4118710A/en
Publication of JPS5289324ApublicationCriticalpatent/JPS5289324A/en
PURPOSE: To prevent an unnecessary developing agent from being applied to recording paper and to improve the contast of the image by forming a bias electrode aroung an electrode needle.