Electrophotographic recording apparatus having a developer resupply control function

摘要: An electrophotographic recording apparatus comprises means for accurately detecting the amount of consumption a developer still by simple construction and also outputting signal indicating to resupply at proper timing. Since is substantially proportional number illuminated dots produced exposing means, CPU reads, every predetermined period, output count values counter, which counts integrally adds up values. Then, compares integration result with value thereby decides shortage developer. On other hand, since deterioration operation time period developing periods When or has been detected, outputs