Patent ID: 7901198

Claim:
A shape-forming shutter apparatus, comprising: a plurality of shutter pieces, each of the shutter pieces having a shaping surface and a sliding surface, the plurality of shutter pieces being arranged in a circle in a manner such that the shaping surface of each shutter piece is slidably in sliding contact with the sliding surface of the neighboring separate shutter pieces; and an opening part being surrounded by the shaping surfaces of the plurality of shutter pieces, the opening part being capable of dilating and contracting, characterized in that, the shape-forming shutter apparatus comprises a pressure contact biasing module always to keep the shaping surface of each shutter piece and the sliding surface of the neighboring shutter piece slidably in pressure contact with each other, and characterized in that, the pressure contact biasing module is a ring-shaped elastic member for biasing the shutter pieces equally, and the pressure contact biasing module is stretchingly wound around the shutter pieces.