Developing apparatus
First Claim
1. An image forming apparatus, comprising:
- a latent image support;
a developer support to which a developing bias with an AC component superimposed on a DC component is applied for visualizing a latent image on said latent image support using a dual component developer supported on said developer support;
a resistance measuring device that measures a carrier resistance of the developer;
a developing bias power supply; and
peak-to-peak voltage changing means provided in said developing bias power supply for reducing a peak-to-peak voltage of the AC component gradually based on a reduction of the carrier resistance.
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Accused Products
Abstract
A developing apparatus has a developer support 2 to which a developing bias VB with an AC component VAC superimposed on a DC component is applied for visualizing a latent image on a latent image support 1 in a dual component developer G supported on the developer support 2. It includes a use history estimation 5 for estimating a use history of the developer G or a use history detection device 6 for detecting a use history of the developer G and a developing bias power supply 3 provided with a peak-to-peak voltage changing device 4 for changing a peak-to-peak voltage Vp-p of the AC component VAC based on information from the use history estimation device 5 or the use history detection means 6.
16 Citations
6 Claims
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1. An image forming apparatus, comprising:
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a latent image support; a developer support to which a developing bias with an AC component superimposed on a DC component is applied for visualizing a latent image on said latent image support using a dual component developer supported on said developer support; a resistance measuring device that measures a carrier resistance of the developer; a developing bias power supply; and peak-to-peak voltage changing means provided in said developing bias power supply for reducing a peak-to-peak voltage of the AC component gradually based on a reduction of the carrier resistance. - View Dependent Claims (2)
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3. An image forming apparatus, comprising:
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a latent image support; a developer support to which a developing bias with an AC component superimposed on a DC component is applied for visualizing a latent image on said latent image support using developer supported on said developer support; a developer bias power supply; a current measuring means for measuring an increase in a current value of the developer with time; and peak-to-peak voltage changing means provided in said developing bias power supply for reducing a peak-to-peak voltage of the AC component gradually based on the increase in a current value information from a use history detection means. - View Dependent Claims (4)
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5. An image forming apparatus, comprising:
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a latent image support; a developer support to which a developing bias with an AC component piggybacked on a DC component is applied for visualizing a latent image on said latent image support in a dual component developer supported on said developer support a resistance measurement means for measuring a resistance value of said developer between said latent image support and said developer support; and a developing bias power supply; and peak-to-peak voltage changing means responsive to the number of run copy sheets provided in said developing bias power supply for changing a peak-to-peak voltage of an AC component based on information from said resistance measurement means.
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6. An image forming apparatus, comprising:
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a latent image support; a developer support to which a developing bias with an AC component superimposed on a DC component is applied for visualizing a latent image on said latent image support using a dual component developer supported on said developer support; a measurement means for measuring a number of copy sheets since a use start time of a new developer; a developing bias power supply; and peak-to-peak voltage changing means provided in said developing bias power supply for reducing a peak-to-peak voltage of the AC component gradually based on an increase of the number of copy sheets.
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Specification