| 摘要 |
PURPOSE:To compensate mechanically the activity of a developer accurately and quickly, by supplying a supplementary liquid to the developer to be compensated or allowing an exposed disused film to pass in the developer on a basis of a value obtained by multiplying the difference between a standard density and a measured density by an experimentally obtained coefficient. CONSTITUTION:When the first gate 15 is opened, the first multiplying circuit 10 is started by the signal passing through this gate 15, and a density difference (N-N') inputted from a subtracting circuit 14 and the first blackening coefficient K1 inputted from the first blackening coefficient setter 7 are used to perform the operation of an expression T=K1X(N-N'). A constant flow rate solenoid valve 19 is opened during the time T to supply a required quantity of a blackening compensating liquid, and the developer is restored to a prescribed activity. When the second gate 16 is opened, the second multiplying circuit 11 is started by a signal passing through this gate 16, and the density difference (N-N') inputted from the subtracting circuit 14 and the second blackening coefficient K2 inputted from the second blackening coefficient setter 8 are used to perform the operation of an expression A=K2X(N-N'). The result is displayed as an area value A on a display 21 through a decoder, and the exposed film is allowed to pass in the developer in accordance with this value to restore the developer to a prescribed activity. |
