Developer Regulating Member Pressure Distribution for Image Quality

The patent applies local quality by creating different pressure zones within the developer layer thickness regulating portion. The upstream region has higher abutting pressure to effectively regulate small particle size developers, while the downstream region has lower pressure to prevent stripe generation. This spatial variation in pressure characteristics allows the single regulating portion to simultaneously satisfy both contradictory requirements for different particle sizes and stripe prevention.

The patent employs parameter changes by optimizing the abutting pressure within a specific range (0.03 MPa to 0.15 MPa) and controlling the abutting width (0.5 mm to 5.0 mm) to achieve the desired developer layer thickness uniformity. By carefully selecting and controlling these physical parameters, the patent resolves the contradiction between maintaining sufficient pressure for regulation and avoiding excessive pressure that would cause other issues.

The patent applies spheroidality by designing the developer regulating member with a curved or arc-shaped abutting surface that contacts the developer carrier. This curved geometry naturally creates the desired pressure distribution pattern (higher pressure upstream, lower pressure downstream) without requiring complex mechanical adjustment mechanisms, thereby achieving precise pressure control while maintaining relatively simple device structure.