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Title:
CONTROLLING METHOD OF CONCENTRATION OF LIQUID DEVELOPER FOR DEVELOPING DEVICE OF ELECTROPHOTOGRAPHIC PLANOGRAPHIC PRINTING PLATE
Document Type and Number:
Japanese Patent JP3556316
Kind Code:
B2
Abstract:

PURPOSE: To always obtain a good developing state just after the electric power is turned on by detecting the concn. of a liquid developer at the time when the power is turned off and controlling the developer in such a manned that if the detected concn. is lower than the threshold of the higher concn. side in the preliminarily determined initial concn. range, the concn. of the liquid developer is increased to the threshold of the higher concn. side of the determined initial concn. range.
CONSTITUTION: Light beams from a light emitting element 20a of an optical detecting means 20 for the concn. of a liquid developer is transmitted through the liquid developer 2 and received by a light receiving element 20b. The light receiving element 20b generates a photocurrent according to the intensity of the transmitted light, which is then sent as the photocurrent output to a comparator 30. The photocurrent output is compared with the upper and lower limits of the photocurrent output corresponding to the preliminarily determined threshold of the proper concn. range in the comparator 30. If the detected photocurrent output is higher than the upper limit, a pump driving circuit 31 is operated to operate a supply pump 71 for a replenisher to supply a replenisher 3 to a liquid developer reservoir 12. If the detected current is lower than the lower limit, the pump 71 is stopped.


Inventors:
Kaneda, Yasuo
Tsuda, Futoshi
Application Number:
JP1995000063791
Publication Date:
August 18, 2004
Filing Date:
March 23, 1995
Export Citation:
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Assignee:
MITSUBISHI PAPER MILLS LTD
International Classes:
G03G13/28; (IPC1-7): G03G13/28
Domestic Patent References:
JP7064354A
JP6241996A
JP7020663A