Developing device

Details Developing device Developing device

1998-05-07

1999-05-25

Moses, Richard

Electrophotography

Image formation

Development

399269, G03G 1508

Patent

active

059077557

ABSTRACT:
A predetermined mathematical formula, which defines an occurrence degree of an image defect where the toner layer is thinned or no toner image is formed, is set up, which is valid for a developing device including a reverse turn developer carrier and a forward turn developer carrier. A difference between the total sum A of the values by the above formula showing the occurrence degree of the image defect on the forward turn developing roller and the total sum B of the values by the above formula showing the occurrence degree on the reverse turn developing roller, i.e., (A-B), is selected within a range of -0.56 to +0.5.

REFERENCES:
patent: 3638614 (1972-02-01), Young et al.
patent: 4063533 (1977-12-01), White
patent: 4246867 (1981-01-01), Hudson
patent: 4442790 (1984-04-01), Swapceinski et al.
patent: 4679527 (1987-07-01), Chang
patent: 5416571 (1995-05-01), Yamada et al.
patent: 5630201 (1997-05-01), Suzuki et al.

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