Developing apparatus having developer carrying screw with a plurality of inclination angles

A developing apparatus comprising:

• a developer bearing member;
• and
• a developer carrying screw placed in parallel with said developer bearing member,
• wherein said developer carrying screw includes a rotary shaft and a spiral blade, and said spiral blade is wound about said rotary shaft in a spiral form and has a carrying surface for carrying a developer, and
• wherein when viewing said developer carrying screw in cross section along a longitudinal direction of said developer carrying screw, said carrying surface includes surface portions having a plurality of different inclination angles with respect to a rotation center line of said rotary shaft.

A developing apparatus comprising:

• a developer bearing member;
• and
• a developer carrying screw placed in parallel with said developer bearing member,
• wherein said developer carrying screw includes a rotary shaft and a plurality of spiral blades, and each of said plurality of blades is wound about said rotary shaft in a spiral form and has a carrying surface for carrying a developer, and
• wherein when viewing said developer carrying screw in cross section along a longitudinal direction of said developer carrying screw, an inclination angle of a carrying surface of one of said plurality of blades with respect to a rotation centerline of said rotary shaft is different from an inclination angle of a carrying surface of the other of said plurality of blades.