Patent ID: 8535029

Claim:
A scroll type compressor comprising: a rotary shaft; a fixed scroll member including a fixed end plate having first and second sides, and further including a fixed scroll wall formed on the first side, wherein the fixed scroll wall spirally extends from a radially inner end adjacent a radial center of the fixed end plate to a radially outer end adjacent an outer periphery of the fixed end plate; a movable scroll member including a movable end plate and a movable scroll wall formed on the movable end plate, wherein the movable scroll member is adapted to make an orbital motion in accordance with the rotation of the rotary shaft whereby a compression chamber to decrease the volume of the compression chamber with the orbital motion of the movable scroll member is formed between the fixed scroll member and the movable scroll member; and a rib provided on the second side so as to extend behind and in at least partial alignment with the radially inner end of the fixed scroll wall in a rotation axis direction of the rotary shaft.