G - Physics – 03 – G
Patent
G - Physics
03
G
314/39
G03G 15/02 (2006.01) G03G 21/00 (2006.01)
Patent
CA 1235175
Abstract Improvements relating to the production of developed electrostatic images Developed electrostatic images are obtained with an apparatus as illustrated in Fig. 1 and which comprises a recording drum (1) comprising a photoconductive layer (2), corona discharge means (4) for electrostatically chaging such layer, means (11) for information-wise exposing said layer to electromagnetic radiation to which it is sensitive thereby to form an electrostatic latent image, means (14) for applying electrostatically charged toner particles to develop said latent image, means for effecting information-wise transfer of such applied toner to a receptor element, and means for restoring said photoconductive layer to a rest potential preparatory to another recording cycle, characterised in that the apparatus includes : (i) means (13) which functions during the performance of a string of copying cycles, i.e. a series of copying cycles which follow immediately one after another, to register automatically the number of performed copying cycles of such string as they are performed and to yield output signals indicative of the registered number; (ii) means (17) which functions to register the period of time elapsing between any two immediately successive strings of copying cycles and to yield output signals indicative of such period of time; (iii) electronic control means (9) which functions in dependence on said output signals from means (i) and (ii) to control automatically the voltage level of the corona source (4) to effect charging of the photoconductive layer (2) at the start of a copying cycle so that said voltage level is varied from one cycle to another in a way which at least partly compensates for variations in the chargeability of the photoconductive layer attributable to fatigue and dark recovery.
473903
de Schamphelaere Lucien A.
Librecht Freddy M.
Verlinden Willy G.
Agfa-Gevaert Naamloze Vennootschap
Borden Ladner Gervais Llp
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