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US 7,925,175 B2Granted
Developing device and image forming apparatus including the same
AssigneeKyocera Mita Corporation
InventorSayo Mabuchi
Life of this patent
Estimating the term…
Abstract
A developing device includes a developer container storing a developer, a developer supplying member supplying a toner stored in the developer container to an image bearing member, a voltage applying unit capable of applying a bias voltage to the developer supplying member, an image density detecting unit detecting a density of toner formed on the image bearing member, and a control unit correcting a toner concentration in the developer on the basis of a result of image density detection of a reference toner image formed on the image bearing member. The control unit is capable of executing a first toner concentration correction between printing operations and executing a second toner concentration correction between predetermined points during continuous printing.
Claims20
A developing device comprising:
- a developer container configured to store a developer containing a carrier and a toner;
- a developer supplying member configured to supply the toner stored in the developer container to an image bearing member;
- voltage applying means capable of applying a bias voltage to the developer supplying member;
- image density detecting means configured to detect a density of toner formed on the image bearing member;
- and
- control means configured to correct a toner concentration in the developer on the basis of a result of image density detection of a reference toner image formed on the image bearing member, the image density detection being performed by the image density detecting means,
- wherein the control means is capable of executing a first toner concentration correction between printing operations and executing a second toner concentration correction between predetermined points during continuous printing;
- the first toner concentration correction includes applying a predetermined reference-toner-image formation bias voltage to the developer supplying member so as to form the reference toner image, the reference-toner-image formation bias voltage being a voltage for forming the reference toner image;
- and
- the second toner concentration correction includes applying the reference-toner-image formation bias voltage and a correction bias voltage to the developer supplying member so as to form the reference toner image.
7 more elements
An image forming apparatus having a developing device that comprises:
- a developer container configured to store a developer containing a carrier and a toner;
- a developer supplying member configured to supply the toner stored in the developer container to an image bearing member;
- voltage applying means capable of applying a bias voltage to the developer supplying member;
- image density detecting means configured to detect a density of toner formed on the image bearing member;
- and
- control means configured to correct a toner concentration in the developer on the basis of a result of image density detection of a reference toner image formed on the image bearing member, the image density detection being performed by the image density detecting means,
- wherein the control means is capable of executing a first toner concentration correction between printing operations and executing a second toner concentration correction between predetermined points during continuous printing;
- the first toner concentration correction includes applying a predetermined reference-toner-image formation bias voltage to the developer supplying member so as to form the reference toner image, the reference-toner-image formation bias voltage being a voltage for forming the reference toner image;
- and
- the second toner concentration correction includes applying the reference-toner-image formation bias voltage and a correction bias voltage to the developer supplying member so as to form the reference toner image.
7 more elements
A method for developing an image in an image forming apparatus, the method comprising:
- storing, in a developer container, a developer containing a carrier and a toner;
- supplying, in a developer supplying member, the toner stored in the developer container to an image bearing member;
- applying, in a voltage applying means, a bias voltage to the developer supplying member;
- detecting, in an image density detecting means, a density of toner formed on the image bearing member;
- correcting a toner concentration in the developer on the basis of a result of image density detection of a reference toner image formed on the image bearing member, the image density detection being performed by the image density detecting means;
- and
- executing a first toner concentration correction between printing operations and executing a second toner concentration correction between predetermined points during continuous printing;
- wherein the first toner concentration correction includes applying a predetermined reference-toner-image formation bias voltage to the developer supplying member so as to form the reference toner image, the reference-toner-image formation bias voltage being a voltage for forming the reference toner image;
- and
- wherein the second toner concentration correction includes applying the reference-toner-image formation bias voltage and a correction bias voltage to the developer supplying member so as to form the reference toner image.
7 more elements
Dependencies are inferred from the claim text.