Charging device and image forming apparatus
First Claim
1. A charging device comprising a charging roll and a voltage application unit which is capable of applying to the charging roll a voltage in which an alternating current voltage is superimposed on a direct current voltage, the alternating current (Iac) which flows through the charging roll satisfying the following Equation (1), the charging roll satisfying the following conditions (a) to (c), and the charging roll contacting an image supporter to charge the image supporter:
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Iac/I(inflection)≦
1.2
Equation (1)(in the Equation (1), I (inflection) represents the flexion point of Iac)(a) the fluctuation of the outside diameter is 0.1 mm or less(b) resistance (common logarithm) is 9.0 log·
Ω
or less(c) resistance variation (common logarithm) is 0.5 log·
Ω
or less.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention provides a charging device including a charging roll and a voltage application unit which is capable of applying to the charging roll a voltage in which an alternating current voltage is superimposed on a direct current voltage, the alternating current (Iac) which flows through the charging roll satisfying the following Equation (1), the charging roll satisfying the following conditions (a) to (c), and the charging roll contacting an image supporter to charge the image supporter:
Iac/I(inflection)≦1.2 Equation (1)
- (in the Equation (1), I (inflection) represents the flexion point of lac)
- (a) the fluctuation of the outside diameter is 0.1 mm or less
- (b) resistance (common logarithm) is 9.0 log·Ω or less
- (c) resistance variation (common logarithm) is 0.5 log·Ω or less.
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Citations
14 Claims
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1. A charging device comprising a charging roll and a voltage application unit which is capable of applying to the charging roll a voltage in which an alternating current voltage is superimposed on a direct current voltage, the alternating current (Iac) which flows through the charging roll satisfying the following Equation (1), the charging roll satisfying the following conditions (a) to (c), and the charging roll contacting an image supporter to charge the image supporter:
-
Iac/I(inflection)≦
1.2
Equation (1)(in the Equation (1), I (inflection) represents the flexion point of Iac) (a) the fluctuation of the outside diameter is 0.1 mm or less (b) resistance (common logarithm) is 9.0 log·
Ω
or less(c) resistance variation (common logarithm) is 0.5 log·
Ω
or less. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image forming apparatus comprising an image supporter, a charging device which charges the image supporter, a latent image forming device which forms a latent image on the charged surface of the image supporter, a developing device which develops the latent image formed on the surface of the image supporter into a toner image with toner, a transferring device which transfers the toner image formed on the surface of the image supporter to a transfer receiving body, and a cleaning device which removes residual toner from the surface of the image supporter after transferring of the toner image, the charging device comprising a charging roll, a voltage application unit which is capable of applying to the charging roll a voltage in which an alternating current voltage is superimposed on a direct current voltage, the alternating current (Iac) which flows through the charging roll satisfying the following Equation (1), the charging roll satisfying the following conditions (a) to (c), and the charging roll contacting an image supporter to charge the image supporter:
-
Iac/I(inflection)≦
1.2
Equation (1)(in the Equation (1), I (inflection) represents the flexion point of Iac) (a) the fluctuation of the outside diameter is 0.1 mm or less (b) resistance (common logarithm) is 9.0 log·
Ω
or less(c) resistance variation (common logarithm) is 0.5 log·
Ω
or less. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification