Electrophotography – Diagnostics – Consumable
Reexamination Certificate
1999-09-02
2001-03-27
Brase, Sandra (Department: 2852)
Electrophotography
Diagnostics
Consumable
C399S061000
Reexamination Certificate
active
06208816
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a developing device, a process cartridge, an electrophotographic image forming apparatus and an agitating member. The electrophotographic image forming apparatus serves to form an image on a recording medium by using an electrophotographic image forming process and may include an electrophotographic copying machine, an electrophotographic printer (for example, a laser beam printer, an LED printer and the like), a facsimile apparatus, a word processor and the like. The process cartridge is constituted by integrally incorporating charging means, or cleaning means, developing means, and an electrophotographic photosensitive member as a cartridge unit which is detachably mountable to a main body of the image forming apparatus, or, by integrally incorporating at least one of charging means and cleaning means, developing means and an electrophotographic photosensitive member as a cartridge unit that is detachably mountable to a main body of the image forming apparatus, or by integrally incorporating developing means and an electrophotographic photosensitive member as a cartridge unit that is detachably mountable to a main body of the image forming apparatus.
2. Related Background Art
In the past, as one of electrophotographic image forming apparatuses, there has been proposed an image forming apparatus to which a developing device or a process cartridge can be detachably mounted. The developing device or the process cartridge comprises a toner container (developer container) for containing toner (developer), and a developing chamber including a developing roller as a developer bearing member. When the developer in the toner container is consumed, the developing device or the process cartridge must be replaced by a new developing device or a new process cartridge. To this end, there is provided a developer-remaining-amount detecting device for detecting a remaining amount of the developer in the toner container.
Such a developer-remaining-amount detecting device has a metallic antenna rod extending in parallel with a longitudinal direction of the developing roller and is disposed in a passage extending from the toner container to the developing roller in the developing chamber. By applying a voltage between the antenna rod and the developing roller to measure the electrostatic capacity therebetween, the toner remaining amount can be detected. When the detected electrostatic capacity is smaller than a predetermined threshold value, it is judged that the toner amount between the antenna rod and the developing roller is small, i.e., the toner amount in the toner container is small. By detecting the change in the electrostatic capacity in this way, the absence of toner has been detected.
However, in the conventional toner-remaining-amount detecting devices, the fact that the remaining toner is little can merely be known immediately before the toner is used up, but, the user cannot know how much toner is remaining in the toner container.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a developing device, a process cartridge, an agitating member and an electrophotographic image forming apparatus, in which a toner remaining amount can be detected successively.
Another object of the present invention is to provide a developing device, a process cartridge, an agitating member and an electrophotographic image forming apparatus, in which a toner remaining amount can be detected with high accuracy.
A further object of the present invention is to provide a developing device, a process cartridge, an agitating member and an electrophotographic image forming apparatus, in which a toner remaining amount is detected by using a change in electrostatic capacity.
The other object of the present invention is to provide a developing device, a process cartridge, an agitating member and an electrophotographic image forming apparatus, that have a movable antenna member for detecting a remaining amount of toner remaining in the developing device, which antenna member serves to detect the toner remaining amount on the basis of the change in electrostatic capacity between electrodes provided on the antenna member.
These and other objects, features and advantages of the present invention will become more apparent upon a consideration of the following description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4133453 (1979-01-01), Ohbora
patent: 4364659 (1982-12-01), Noda
patent: 5294960 (1994-03-01), Nomura et al.
patent: 5331373 (1994-07-01), Nomura et al.
patent: 5452056 (1995-09-01), Nomura et al.
patent: 5559581 (1996-09-01), Sugiura et al.
patent: 5561496 (1996-10-01), Sugiura et al.
patent: 5623328 (1997-04-01), Tsuda et al.
patent: 5634178 (1997-05-01), Sugiura et al.
patent: 5642187 (1997-06-01), Nomura et al.
patent: 5650841 (1997-07-01), Matsuda et al.
patent: 5678139 (1997-10-01), Nomura et al.
patent: 5697022 (1997-12-01), Matsuda et al.
patent: 5787323 (1998-07-01), Nomura et al.
patent: 5790917 (1998-08-01), Takura et al.
patent: 5825472 (1998-10-01), Araki et al.
patent: 5828928 (1998-10-01), Sasago et al.
patent: 5839028 (1998-11-01), Nomura et al.
patent: 5864731 (1999-01-01), Ikemoto et al.
patent: 5878309 (1999-03-01), Nomura et al.
patent: 5907751 (1999-05-01), Kawaguchi et al.
patent: 5923917 (1999-07-01), Sakurai et al.
patent: 5987269 (1999-11-01), Allen et al.
patent: 6035150 (2000-03-01), Domon et al.
Koizumi Toru
Nomura Yoshiya
Brase Sandra
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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