The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1983
Filed:
Nov. 27, 1981
Masaji Mizuta, Uji, JP;
Dainippon Screen Seizo Kabushiki Kaisha, Kyoto, JP;
Abstract
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.