Developer bearing member and developing device with outer electrode including separated portions, and inner electrode for creating electric field
First Claim
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1. A developer bearer for conveying a developer to a developing station under an influence of an electric field created by an electric flux line, said developer bearer comprising:
- an outer electrode and an inner electrode configured to receive voltages different from each other and collectively create the electric flux line, said outer electrode and said inner electrode being arranged on different layers in a normal line direction of the developer bearer, wherein the outer electrode is located at an outer side of the developer bearer and configured to include at least two electrode portions separated at a prescribed interval on a same circumference of the developer bearer, the inner electrode opposing at least two intervals between the at least two electrode portions of the outer electrode, and at least two electric fields are created side by side outside an outer circumferential surface of the developer bearer by a neighboring pair of the at least two electrode portions, said at least two electric fields having different intensities from each other; and
an insulation layer sandwiched between the outer electrode and the inner electrode in the normal line direction and configured to insulate the outer electrode and the inner electrode.
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Abstract
An developer bearer conveys developer to a developing station under influence of an electric field created by an electric flux line. The developer bearer includes plural kinds of electrodes that receive different voltages from each other and collectively creates the electric flux line. The plural kinds of electrodes are arranged on different layers in a normal line of the developer bearer. The developer bearer includes an insulation layer that insulates the plural kinds of electrodes.
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Citations
20 Claims
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1. A developer bearer for conveying a developer to a developing station under an influence of an electric field created by an electric flux line, said developer bearer comprising:
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an outer electrode and an inner electrode configured to receive voltages different from each other and collectively create the electric flux line, said outer electrode and said inner electrode being arranged on different layers in a normal line direction of the developer bearer, wherein the outer electrode is located at an outer side of the developer bearer and configured to include at least two electrode portions separated at a prescribed interval on a same circumference of the developer bearer, the inner electrode opposing at least two intervals between the at least two electrode portions of the outer electrode, and at least two electric fields are created side by side outside an outer circumferential surface of the developer bearer by a neighboring pair of the at least two electrode portions, said at least two electric fields having different intensities from each other; and an insulation layer sandwiched between the outer electrode and the inner electrode in the normal line direction and configured to insulate the outer electrode and the inner electrode. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12)
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4. A developing device, comprising:
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an outer electrode and an inner electrode configured to receive voltages different from each other and collectively create an electric flux line, said outer electrode and said inner electrode being arranged at different layers in a normal line direction of a developer bearer, said outer electrode is located at an outer side of the developer bearer and configured to include at least two electrode portions separated at a prescribed interval on a same circumference of the developer bearer, the inner electrode is located at an inner side of the developer bearer opposing at least two intervals between the at least two electrode portions of the outer electrode; an insulation layer sandwiched between the outer electrode and the inner electrode in the normal line direction and configured to insulate the outer electrode and the inner electrode; and at least one power distribution device configured to distribute different powers to the outer electrode and the inner electrode, respectively, wherein said at least one power distribution device distributes powers to form an electric field outside an outer circumferential surface of the developer bearer, said electric field causing a toner to hop on the outermost circumferential surface between one of the at least two electrode portions and one of the at least two intervals neighboring thereto, and said at least one power distribution device includes at least two power distribution devices configured to respectively distribute different powers to outer side electrodes arranged in at least two different regions around the developer bearer to form different electric fields.
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13. An developing device, comprising:
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an outer electrode and an inner electrode configured to receive voltages different from each other and collectively create an electric flux line, said outer electrode and said inner electrode being arranged at different layers in a normal line direction of a developer bearer, said outer electrode is located at an outer side of the developer bearer and configured to include at least two electrode portions separated at a prescribed interval on a same circumference of the developer bearer, the inner electrode is located inside the outer electrode opposing at least two intervals between the at least two electrode portions of the outer electrode; an insulation layer sandwiched between the outer electrode and the inner electrode in the normal line direction and configured to insulate the outer electrode and the inner electrode; and at least one power distribution device configured to distribute different powers to the outer electrode and the inner electrode, respectively, wherein said at least one power distribution device distributes powers to form an electric field outside an outer circumferential surface of the developer bearer, said electric field causing a toner to hop on the outermost circumferential surface between one of the at least two electrode portions and one of the at least two intervals neighboring thereto, and said at least one power distribution device includes at least two power distribution devices configured to respectively distribute different powers to outer side electrodes arranged in at least two different regions around the developer bearer to form different electric fields. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A developer bearer for conveying a developer to a developing station under an influence of an electric field created by an electric flux line, said developer bearer comprising:
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an outer electrode and an inner electrode configured to receive voltages different from each other and collectively create the electric flux line, said outer electrode and said inner electrode being arranged on different layers in a normal line direction of the developer bearer, wherein the outer electrode is located at an outer side of the developer bearer and configured to include at least two electrode portions separated at a prescribed interval on a same circumference of the developer bearer, the inner electrode is located at an inner side of the developer bearer, and the inner electrode includes portions opposing at least two intervals between the at least two electrode portions of the outer electrode, arranged over a portion of the length of the inner electrode, and closer to an outer circumferential surface of the developer bearer than portions of the inner electrode opposing the at least two electrode portions; and an insulation layer sandwiched between the outer electrode and the inner electrode in the normal line direction and configured to insulate the outer electrode and the inner electrode. - View Dependent Claims (20)
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Specification