Image forming apparatus and image forming method
An image and image carrier technology, which can be applied to corona discharge devices, electrical recording processes using charge patterns, equipment for electrical recording processes applying charge patterns, etc., and can solve problems such as high cost and complicated image forming devices.
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Embodiment 1
[0050] Using the image forming apparatus having the same configuration as in FIG. 1 , the gap between the photoreceptor and the charging roller was adjusted during the preparatory operation. The charging roller uses a polypropylene resin-based ion-conductive roller (volume resistivity 2×10 6 Ω·cm). Figure 7 Indicates the time variation of the current value when adjusting the gap, Figure 8A to Figure 8C Respectively indicate the operating status during gap adjustment.
[0051] initial state as Figure 8A As shown, the charging roller 82 is brought into contact with the photoreceptor 81 by the pressure of the spring 84c. For example, a DC (DC-500V) superimposed AC (pp 2.3kV, 1.2kHz) voltage was applied to the charging roller 82 from a power supply, and a current value (2.6mA) was measured by a measuring device built in the power supply.
[0052] After the initial state measurement, the motor 84 BF Drive Micrometer 84 AF ,Such as Figure 8B As shown, while gradually sepa...
Embodiment 2
[0063] Using the image forming apparatus having the same configuration as in FIG. 1 , the gap between the photoreceptor and the charging roller was adjusted during the preparation operation. The charging roller is the same material as in Example 1, and, as Figure 9 As shown, roller portions 92c having a larger diameter than the image area portion 92b are provided on both end portions outside the image area portion (middle portion) 92b. The step difference between the roller portion 92c and the image area portion 92b was set to 20 μm.
[0064] Then, the charging roller 92 is brought into contact with the photoreceptor 91 on the roller portion 92c, and the same voltage (a voltage of alternating current (pp2.3kV, 1.2kHz) superimposed on direct current (DC-500V)) is applied as in Example 1. ) and the current value was measured, and the front side and the rear side of the charging roller 92 were sequentially separated to adjust the gap.
[0065] After the gap adjustment is perfo...
Embodiment 3
[0070] Using the image forming apparatus having the same configuration as in FIG. 1 , the gap between the photoreceptor and the charging roller was adjusted during the preparation operation. The charging roller was not the resin roller used in Examples 1 and 2, but an elastic roller. As the elastic roller, CR (chloroprene rubber) type rubber rollers having JIS-A hardness of 50° and 70° were used.
[0071] Then, in the same manner as in Example 1, the charging roller was brought into contact with the photoreceptor, and the same voltage (a voltage of alternating current (pp2.3kV, 1.2kHz) superimposed on direct current (DC-500V)) was applied to measure the current value. The gap adjustment was performed by sequentially separating the front side and the rear side of the charging roller.
[0072] After the gap adjustment is performed in this way, actual image formation is performed.
[0073] Figure 11 The temporal change of the current value at the time of gap adjustment is sho...
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