Patent ID: 7337938

Claim:
An ultrasonic bonding horn provided with a bonding pressing surface which extends in one direction and on which ultrasonic wave energy is concentrated, wherein the improvement comprises that the bonding pressing surface is provided with a pair of protrusions delimiting an interior area of the bonding pressure surface and extending parallel to said one direction on opposite sides of the bonding pressing surface spaced from each other in the direction of width of the bonding pressing surface, wherein said bonding pressing surface comprises, between said protrusions, a plurality of projections and recesses arranged in a stripe pattern, said projections extending in the same direction as said protrusions, and wherein: the space (U 1 ) between the protrusions ( 12 a and 12 b ) is 4.6 mm, the distances (U 2 ) between tops (P 1 ) of the protrusions ( 12 a and 12 b ) and bottoms (Q) of said recesses in the bonding pressing surface ( 11 ) are the same as for the protrusions ( 12 a and 12 b ) and are 0.1 mm, the radii (U 3 ) of curvature of chamfers of the protrusions ( 12 a and 12 b ) at said edges of the bonding pressure surface are the same as for the protrusions ( 12 a and 12 b ) and are 0.2 mm, the pitch (U 4 ) of the stripe pattern is 0.76 mm, and the distances (U 5 ) between tops (P 2 ) of the projections of the stripe pattern and the bottoms (Q) of said recesses in the bonding pressing surface ( 11 ) are the same and are 0.1 mm.