Image forming apparatus and the control method including a feature of detecting a remaining amount of a developer
First Claim
1. An image forming apparatus having a developer container containing a developer, a developer supply member for supplying the developer from the developer container to an image bearing member, and first and second detector members for detecting the amount of the developer, the image forming apparatus comprising:
- a storage unit for storing information relating to the developer;
a first detector for detecting a value corresponding to a capacitance between the first detector member and the developer supply member;
a second detector for detecting a value corresponding to a capacitance between the second detector member and the developer supply member; and
a processor for storing the values detected by the first and second detectors, respectively, wherein the processor avoids storing the detected values if the detected values are in a predetermined state.
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Accused Products
Abstract
In an image forming apparatus having a toner container, the remaining amount of toner is detected by measuring a capacitance caused by a toner detector member in the toner container. It is determined whether the measured capacitance falls within a predetermined range. If it is determined that the measured capacitance falls not within the predetermined range, the measured capacitance is not used in the detection of the remaining amount of toner. The present invention thus provides an image forming apparatus reliable in the detection of toner, and a method of controlling the apparatus.
19 Citations
13 Claims
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1. An image forming apparatus having a developer container containing a developer, a developer supply member for supplying the developer from the developer container to an image bearing member, and first and second detector members for detecting the amount of the developer, the image forming apparatus comprising:
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a storage unit for storing information relating to the developer;
a first detector for detecting a value corresponding to a capacitance between the first detector member and the developer supply member;
a second detector for detecting a value corresponding to a capacitance between the second detector member and the developer supply member; and
a processor for storing the values detected by the first and second detectors, respectively, wherein the processor avoids storing the detected values if the detected values are in a predetermined state. - View Dependent Claims (2, 3, 4, 5)
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6. An image forming apparatus having a developer container containing a developer, a developer supply member for supplying the developer from the developer container to an image bearing member, and first and second detector members for detecting the amount of the developer, the image forming apparatus comprising:
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a storage unit for storing information relating to the developer;
a first detector for detecting a value corresponding to a capacitance between the first detector member and the developer supply member;
a second detector for detecting a value corresponding to a capacitance between the second detector member and the developer supply member; and
a calculator for calculating the amount of the developer in the developer container based on a plurality of values which are detected by one of the first and second detectors during a predetermined period of time, wherein the calculator compares the plurality of values detected during the predetermined period of time with a predetermined threshold, and avoids using in the calculation of the amount of the developer any one of the plurality of values that is determined to be equal to or below the threshold. - View Dependent Claims (7, 8, 9)
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10. A method for controlling an image forming apparatus having a developer container containing a developer, a developer supply member for supplying the developer from the developer container to an image bearing member, first and second detector members for detecting the amount of the developer, and a storage unit for storing information relating to the developer, the method comprising:
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a first step of detecting a value corresponding to a capacitance between the first detector member and the developer supply member and a value corresponding to a capacitance between the second detector member and the developer supply member;
a second step of storing the values, detected in the first step, in the storage unit; and
a third step of avoiding storing the detected values if the values detected in the first step are at a predetermined state. - View Dependent Claims (11)
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12. A method for controlling an image forming apparatus having a developer container containing a developer, a developer supply member for supplying the developer from the developer container to an image bearing member, first and second detector members for detecting the amount of the developer, and a storage unit for storing information relating to the developer, the method comprising:
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a first step of detecting a value corresponding to a capacitance between the first detector member and the developer supply member and a value corresponding to a capacitance between the second detector member and the developer supply member;
a second step of calculating the amount of the developer within the developer container based on a plurality of values which are detected by one of the first and second detector members during a predetermined period of time;
a third step of comparing each of the plurality of values detected during the predetermined period of time with a predetermined threshold; and
a fourth step of avoiding using, in the calculation in the second step, any one of the plurality of detected values which is determined to be equal to or smaller than the predetermined threshold. - View Dependent Claims (13)
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Specification