Toner-particle bearing roller, developing device, and image forming apparatus
A developing device and toner technology, which is applied in the fields of toner particle carrying rollers, developing devices and image forming devices, and can solve problems such as light density and uneven toner image
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Problems solved by technology
Method used
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Examples
no. 2 approach
[0185] (Example of the structure of the developing roller 510 of the developing device of the second embodiment)
[0186] Here, an example of the structure of the developing roller 510 of the developing device of the second embodiment will be described with reference to FIG. 14 . Fig. 14 is equivalent to Fig. 8 and is a schematic view showing the cross-sectional shapes of protrusions and recesses in the second embodiment.
[0187] As can be seen from a comparison of FIGS. 8 and 14 , the difference between the developing roller 510 of the developing device of the second embodiment and the developing roller 510 of the developing device of the first embodiment lies in the protrusions.
[0188] As shown in FIG. 14 , the convex portion 1519 of the second embodiment has a rounded corner 1519d at its top end portion 1519a. The radius of curvature of the rounded corners 1519d is set at half or more of the volume average particle diameter (7 μm) of the toner particles.
[0189] The c...
no. 3 approach
[0196] (Structural Example of the Developing Roller 510 of the Developing Device of the Third Embodiment)
[0197] Here, a structural example of the developing roller 510 of the developing device of the third embodiment will be described with reference to FIGS. 15 to 17 . FIG. 15 is a schematic perspective view of the developing roller 510 . FIG. 16 is a schematic front view of the developing roller 510 . FIG. 17 is a schematic view showing the cross-sectional shape of the concave portion 2516 provided on the surface of the developing roller 510 , which shows a cross section along the direction indicated by symbol X or symbol Y in FIG. 16 . In addition, in FIGS. 15 to 17 , the proportions of the recessed portion 2516 and the like are different from the actual ones in order to facilitate understanding of the drawings.
[0198] The developing roller 510 of the developing device according to the third embodiment is a member made of aluminum alloy, iron alloy, etc., carries the ...
no. 4 approach
[0225] (Structural Example of the Developing Roller 510 of the Developing Device of the Fourth Embodiment)
[0226] Here, a configuration example of the developing roller 510 of the developing device according to the fourth embodiment will be described with reference to FIGS. 22 to 25 . FIG. 22 is a schematic perspective view of the developing roller 510 . FIG. 23 is a schematic front view of the developing roller 510 . FIG. 24 is an enlarged view of the central portion 510 a of the developing roller 510 . FIG. 25 is a schematic diagram showing the shapes of the convex portion 3512, the concave portion 3515, and the like, and the upper diagram of FIG. 25 schematically shows an enlarged view shown in FIG. 24 . In addition, the lower diagram of FIG. 25 shows the cross-sectional shapes of the convex portion 3512, the concave portion 3515, and the like. In addition, in FIG. 22 , FIG. 23 , and FIG. 25 , the proportions of the convex portion 3512 and the like are different from t...
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