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71. 发明专利

DE3877051D1 未知
公开(公告)号：DE3877051D1
公开(公告)日：1993-02-11
申请号：DE3877051
申请日：1988-05-05
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISHIHARA HIDESHI
IPC分类号： G03G15/08
摘要： An electrophotographic recording apparatus comprises means for accurately detecting the amount of consumption of a developer still by means of a simple construction and also means for outputting a signal for indicating to resupply the developer at proper timing. Since the amount of consumption of the developer is substantially proportional to the number of illuminated dots produced by exposing means (2), a CPU (5a) reads, at every predetermined period, output count values of a counter (4), which counts the number of illuminated dots produced by the exposing means (2), and integrally adds up the output count values. Then, the CPU (5a) compares the integration result of the output count values with a predetermined value and thereby decides a shortage of the developer. On the other hand, since the deterioration of a developer is substantially proportional to the operation time period of developing means (8a, 8b), the CPU (5a) integrally adds up the operation time periods of the developing means (8a, 8b), compares the integration result of the operation time periods of the developing means (8a, 8b) with a predetermined time and thereby decides the deterioration of the developer. When the shortage or deterioration of the developer has been detected, the apparatus outputs a signal for indicating to resupply the developer.

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