Developing Sleeve Recesses for Uniform Image Density

The invention changes the surface structure parameter from fine convex-concave portions (sandblasting) to larger recesses with specific depth (0.05-0.15mm) and area (0.1-1.0mm²) ratios. This parameter change provides sufficient developer retention while reducing wear because the larger, shallower recesses distribute stress more effectively compared to deep sandblasted cavities.

The invention applies local quality by creating specific recess regions on the developing sleeve surface with controlled depth and area ratios. The recesses are strategically designed to provide developer holding capacity only where needed, while maintaining a relatively smooth overall surface that resists wear. The local recess structures prevent developer slip without requiring the entire surface to be heavily textured.

The invention changes the surface structure from deep grooves to shallow recesses with controlled depth (0.05-0.15mm) and area ratio (1-10%). This parameter change eliminates pitch-like uneven density because the shallow recesses create minimal variation in the development electric field intensity, while still providing sufficient developer retention. The smaller depth parameter prevents the cyclical transport variations that occur with deeper grooves.

The invention uses local quality by distributing numerous small recesses across the surface rather than forming deep grooves. This local approach with many small features (each recess having small area and depth) provides uniform developer distribution while maintaining durability. The local recesses prevent developer slip without creating the large-scale cyclical variations that cause pitch-like uneven density.

The invention changes the surface structure parameter to create shallow recesses (depth 0.05-0.15mm) that can be formed on conventional aluminum alloy sleeves. This parameter change allows achieving durability through surface geometry rather than material substitution, maintaining the cost advantage of aluminum alloy while providing wear resistance through the engineered recess pattern.

The invention applies segmentation by dividing the surface into numerous small recess regions rather than using a single material solution. This segmentation approach allows the base material to remain inexpensive aluminum alloy while the segmented recess structures provide the durability function, separating the material selection from the durability function.