Electrophotography – Image formation – Development
Reexamination Certificate
2000-02-04
2001-11-20
Beatty, Robert (Department: 2852)
Electrophotography
Image formation
Development
C399S104000
Reexamination Certificate
active
06321056
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a copier, facsimile apparatus, printer or similar image forming apparatus and more particularly to a developing device included in an image forming apparatus.
2. Discussion of the Background
Typical of a developing device for the above application includes a developer carrier made up of a magnet roller, a nonmagnetic sleeve rotatable around the magnet roller, and a pair of flanges supporting the magnet roller and sleeve. The problem with this type of developing device is that a developer tends to accumulate in an excessive amount on opposite end portions of the developer carrier and adhere to the sleeve and a photoconductive element. This is particularly true with a developing device of the type using color developers and setting a relatively low toner softening point by attaching importance to luster and transmission.
Technologies relating to the present invention are disclosed in, e.g., Japanese Patent Laid-Open Publication Nos. 6-244021, 9-26702, 9-274391, and 10-333431.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a developing device capable of obviating the adhesion of a developer to a developer carrier and a photoconductive element ascribable to the presence of an excessive amount of developer at opposite ends of the developer carrier.
A developing device for developing a latent image electrostatically formed on an image carrier of the present invention includes a developer chamber for storing a developer consisting of toner and carrier. A developer carrier accommodates a magnetized body therein for conveying the developer deposited thereon to a developing region where the developer carrier faces the image carrier. A first regulating member regulates the thickness of the developer deposited on the developer carrier in a layer. A pair of second regulating members are respectively positioned upstream of opposite ends of the first regulating member in the direction in which the developer carrier conveys the developer.
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Beatty Robert
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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