Photocopying – Contact printing – Light boxes
Patent
1988-05-03
1990-10-16
Moses, R. L.
Photocopying
Contact printing
Light boxes
355208, 355245, 355326, 118688, G03G 1506, B05C 1100
Patent
active
049639277
ABSTRACT:
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, a CPU reads, at every predetermined period, output count values of a counter, which counts the number of illuminated dots produced by the exposing means, and integrally adds up the output count values. Then, the CPU 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, the CPU integrally adds up the operation time periods of the developing means, compares the integration result of the operation time periods of the developing means 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.
REFERENCES:
patent: 3693581 (1972-09-01), Quant
patent: 3981272 (1976-09-01), Smith et al.
patent: 4026643 (1977-05-01), Bergman
patent: 4226525 (1980-10-01), Sakamoto et al.
patent: 4413264 (1983-11-01), Cruz-Uribe et al.
Matsushita Electric - Industrial Co., Ltd.
Moses R. L.
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