Image forming apparatus
First Claim
1. An image forming apparatus having a double-sided print mode, comprising:
- charging means for charging an image carrier;
charge voltage loading means for applying a charge voltage to said charging means;
image forming means for forming an image on a recording material; and
control means for controlling the charge voltage applied by said charge voltage loading means to said charging means, wherein, when an image is formed on a plurality of recording materials, said control means sets the charge voltage at different voltage levels such that the charge voltage level during an interval in which an image is formed on a first side and a second side of the recording material by said image forming means is different from the charge voltage level during an interval between a first sheet and a second sheet of the plurality of recording materials.
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Abstract
The invention provides an image forming apparatus where the useful life of the image carrier does not become significantly short. This system has a charging unit, a charge voltage loading unit, an exposure unit, a development unit, an image transfer unit and a control unit, wherein, when the transport interval of the plural recording materials is shorter than a predetermined time the AC charge voltage applied to the image carrier during the transport interval being a first AC charge voltage, and when the transport interval is longer than the predetermined time the ac charge voltage applied to the image carrier during the transport interval being a second AC charge voltage, the control unit makes the current running in the charging unit to which the second charge voltage is applied lower than the current running in the charging unit to which the first AC charge voltage is applied.
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Citations
8 Claims
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1. An image forming apparatus having a double-sided print mode, comprising:
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charging means for charging an image carrier;
charge voltage loading means for applying a charge voltage to said charging means;
image forming means for forming an image on a recording material; and
control means for controlling the charge voltage applied by said charge voltage loading means to said charging means, wherein, when an image is formed on a plurality of recording materials, said control means sets the charge voltage at different voltage levels such that the charge voltage level during an interval in which an image is formed on a first side and a second side of the recording material by said image forming means is different from the charge voltage level during an interval between a first sheet and a second sheet of the plurality of recording materials. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A printer having a double-sided print mode, comprising:
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a charging portion for charging an image carrier;
a charge voltage loading unit for applying a charge voltage to said charging portion;
an image forming portion for forming an image on a recording material; and
a controller for controlling the charge voltage applied by said charge voltage loading unit to said charging portion, wherein, when an image is formed on a plurality of recording materials, said controller sets the charge voltage at different voltage levels such that the charge voltage level during an interval in which an image is formed on a first side and second side of the recording material by said image forming portion is different from the charge voltage level during an interval between a first sheet and a second sheet of the plurality of recording materials.
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Specification