JPH0333439U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an image forming unit for an optical writing printer as an embodiment of the present invention;
FIG. 2 is a graph showing the developing characteristics of the image forming unit, FIG. 3 is a block diagram showing the developing bias voltage adjustment circuit of the optical writing printer, and FIG. 4 is a schematic sectional view showing a conventional developing device. be. 1, 43...Photosensitive drum, 5f, 42...Developing sleeve, 5g, 41...Magnet, 5h,
44...Doctor blade, D...Layer thickness regulation gap,
L... Development gap, U... Image forming unit, d...
...Developer.

Claims (1)

[Scope of utility model registration request] Image formation formed by integrating at least three members: an image carrier, a developing sleeve that applies developer to the surface of the image carrier, and a developer layer thickness regulating member that regulates the layer thickness of the developer that adheres to the surface of the developing sleeve. In an image forming apparatus having an image forming unit in which image density depends on the arrangement of the three members and the developing bias voltage applied to the developing sleeve, an arrangement display member indicating the arrangement state of the three members is provided for each image forming unit. An image forming apparatus comprising: a voltage switching means for switching an output range of the developing bias voltage according to the arrangement display member.