发明名称 |
A METHOD AND APPARATUS FOR AUTOMATICALLY CONTROLLING THE ACTIVITY OF A DEVELOPING LIQUID |
摘要 |
<p>A method and apparatus for automatically controlling an activity of a developing liquid for use in a developer are disclosed. A blackening area rate detector detects a blackening area rate of a film developed and outputs an analog signal to a voltage-frequency converter which converts it into a digital signal. The digital signal is sent to a dividing counter which frequency-divides it and outputs a supplement signal to an up-down counter. The up-down counter is counted up by the supplement signal to output a high level signal to a timer via a gate. The timer is actuated by the high level signal to actuate a valve so as to supply a supplemental developing liquid to a developing tank. The gate is closed by using the output signal of the timer during the actuation of the timer. The up-down counter is counted down by the high level signal passed through the gate.</p> |
申请公布号 |
GB2089528(A) |
申请公布日期 |
1982.06.23 |
申请号 |
GB19810037263 |
申请日期 |
1981.12.10 |
申请人 |
DAINIPPON SCREEN SEIZO KK |
发明人 |
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分类号 |
G03D3/06;G05D21/02;(IPC1-7):05D21/02 |
主分类号 |
G03D3/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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