Photocopying – Including fiber optics
Patent
1975-10-02
1977-02-08
Hix, L. T.
Photocopying
Including fiber optics
118650, 118651, G03G 1508
Patent
active
040069818
ABSTRACT:
A touchdown system for obtaining many distinctive steps in grey scale rendition when developing solid areas comprises a toner laden donor member and a toner layer pattern forming member. The pattern forming member has an electrode arranged in such a manner thereon that when a predetermined field is established between the electrode and the donor member, a predetermined pattern of peaks and valleys will be formed in the toner layer. When this patterned toner layer is presented to an electrostatic solid area latent image, the weakest charged portions of the latent image will attract only the toner from the portion of the layer which is closest thereto i.e., the peaks, thereby presenting a dot pattern development thereon. The strongest charged portion of the electrostatic latent image will attract toner not only from the closest portion or peaks but will also attract toner from the valleys which will fully develop the image where the charge is strongest. The charged pattern of the latent image which is between the weakest and strongest charge will attract a broadening pattern of toner from the peaks as well as from the valleys as the charge gets stronger.
REFERENCES:
patent: 3696785 (1972-10-01), Andrus
patent: 3881927 (1975-05-01), Fantuzzo
Hix L. T,.
Hutchison Kenneth C.
Xerox Corporation
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