Image forming apparatus
An image and image bearing technology, applied in the direction of electric recording process applying charge pattern, equipment and instrument of electric recording process applying charge pattern, etc., can solve the problem of increasing developing AC and so on
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Embodiment 1
[0041] figure 1 is a sectional view of the image forming apparatus 100 according to Embodiment 1. Such as figure 1 As shown, the image forming apparatus 100 includes an apparatus main body 100A. Inside the apparatus main body 100A, a photosensitive drum 201 as an "image bearing member" is arranged. On the periphery of the photosensitive drum 201, a charging device 202, an exposure device 207, a developing device 209, and a transfer roller 204 are arranged. The developing device 209 as a "developing unit" can develop an electrostatic image formed on the surface of the photosensitive drum 201 by using a developing bias obtained by superimposing a developing AC bias on the developing DC bias Vdc. The image forming section is assumed to include at least the photosensitive drum 201 .
[0042] Here, there are four image forming sections including a cyan image forming section 215 , a magenta image forming section 211 , a yellow image forming section 212 , and a black image form...
Embodiment 2
[0108] Figure 6is a cross-sectional view of the image forming apparatus 200 according to Embodiment 2. In the constitution of Embodiment 2, the same reference numerals are assigned to each of the same constitutions as Embodiment 1, and their description will not be given. Such as Figure 6 As shown, the image forming apparatus 200 includes an apparatus main body 100A, and, within the apparatus main body 100A, a developing device 309 is arranged.
[0109] The developing device 309 includes a plurality of (here, two) developing sleeves 610 and 611 as “developer bearing members” whose developing biases can be independently controlled. The controller 500 changes the developing bias of the developing sleeve 610 located most upstream in the rotational direction of the photosensitive drum 201 . In this way, in Embodiment 2, by applying a control process similar to that of Embodiment 1 to the upstream-side developing sleeve 610 of the two developing sleeves 610 and 611, applicatio...
Embodiment 3
[0116] In Embodiments 1 and 2, in the DC / AC correction ratio table, although the controlled ratios of the developing DC bias voltage and the developing AC bias voltage are configured to be changed in a stepwise manner, in Embodiment 3, the controlled The ratio changes continuously.
[0117] More specifically, the target toner application amount is 0.55 mg / cm 2 , and the applied amount correction value ΔM / S is 0.10mg / cm 2 , which is similar to Embodiment 1, and the correction voltage of the DC / AC bias voltage is set to DC=57V, and AC=200V.
[0118] Then, similarly to Embodiment 1, the correction ratio of the DC / AC bias voltage is set. In this example, by linear interpolation contained in Figure 4B Values of 20V and 30V in the DC / AC Bias Correction Ratio table shown to obtain the correction ratio. For example, a case where the potential difference between the toner potential Vtoner after development and the development DC bias Vdc is 25V will be described. In this case, ...
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