Ultrasonic bonding hone and ultrasonic welding method

1. 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.

2. 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 the bonding pressing surface is a circumferential surface, and the opposite exterior edges are opposite exterior circumferential edges,

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.

3. A rotatable 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 exterior edges of the bonding pressing surface spaced from each other in the direction of width of the bonding pressing surface;

wherein the bonding messing surface is a circumferential surface, and the opposite exterior edges are opposite exterior circumferential edges;

wherein said protrusions are located so as to prevent a fluidized body, which is fluidized by the ultrasonic wave energy, from flowing into an area outside said bonding pressing surface, said fluidized body being formed from resin and emulsion layers of overlapping photographic papers to be ultrasonically bonded at said bonding pressure surface.

4. The ultrasonic bonding horn as defined in claim 3 , 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.