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US 2011/0299892 A1Published application
Developing device and image forming apparatus
AssigneeKonica Minolta Business Technologies, Inc.
InventorsNatsuko MINEGISHI, Naoki TAJIMA, Seiko ITAGAKI, Hiroyuki SAITO
Life of this patent
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Abstract
A developing device, includes a developer agitating member, an upstream side developing miler, and a downstream side developing roller; wherein the toner in the developer handed over from the upstream side developing roller to the downstream side developing roller has a volume average particle size larger than a volume average particle size of the toner in the developer conveyed by the upstream side developing roller to the facing position between the upstream side developing roller and the photoreceptor.
Claims9
A developing device, comprising:
- a developer agitating member that mixes and agitates developer containing toner particles and carrier particles;
- an upstream side developing roller that supports the developer which is mixed and agitated by the developer agitating member, conveys the developer to a facing position opposite to a photoreceptor which carries a latent image, and develops the latent image carried by the photoreceptor by making toner particles in the developer to adhere the latent image under a bias voltage composed of a DC bias and an AC bias;
- and
- a downstream side developing roller that is located at a downstream side of the upstream side developing roller in the rotating direction of the photoreceptor, supports the developer handed over from the upstream side developing roller, conveys the developer to a facing position opposite to a photoreceptor which carries the latent image, and develops the latent image carried by the photoreceptor by making toner particles in the developer to adhere the latent image under a bias voltage composed of a DC bias and an AC bias;
- wherein the toner in the developer handed over from the upstream side developing roller to the downstream side developing roller has a volume average particle size DT2 larger than a volume average particle size DT0 of the toner in the developer conveyed by the upstream side developing roller to the facing position between the upstream side developing roller and the photoreceptor.
- DT0<DT2
3 more elements
Dependencies are inferred from the claim text.