专利名称：Device for detecting a toner concentration in
a developing solution
发明人：Toyoo Okamoto,Seiichi Miyakawa申请号：US05/870520申请日：19780118公开号：US04166702A公开日：19790904
摘要：A device for detecting toner concentration in a developing solution fordeveloping an electrostatic image includes a casing having a small drainage hole formedat a top portion thereof so that a certain amount of a developing solution will always bepresent in the casing even when a tank containing a major portion of the developingsolution used is made empty for some reason. A lamp and a lightsensitive element aremounted in the casing at locations below the drainage hole so that they may remainsubmerged in the solution within the casing at all times, thereby to prevent tonerparticles in the solution from adhering to the active surface of the former and henceerrors in the detection due to the adhesion of toner particles. Alternatively, a pair of lighttransmission members in the form of bundles of optical fibers may be submerged in thesolution within the casing, instead of the lamp and element, in order to allow the latter tobe disposed externally of the casing.
申请人：RICOH CO LTD
代理人：Guy W. Shoup,Gerard F. Dunne
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