Horn and ultrasonic joiner
A horn has knurl-shaped protrusions and recesses that are formed of a plurality of protrusions, and are formed on a first end surface. Among the plurality of protrusions, at least a pair of protrusions arranged symmetrically at both outermost ends in a direction along a vibration direction are asymmetrical surface protrusions. In each of the asymmetrical surface protrusions, an angle value of an outer inclination angle is smaller than an angle value of an inner inclination angle.
1 . A horn that applies ultrasonic vibration to a plurality of objects to be joined sandwiched between an anvil and the horn, to join the objects to be joined to each other, the horn comprising:
knurl-shaped protrusions and recesses that are formed of a plurality of protrusions each extending in a width direction perpendicular to a vibration direction of the horn, and that are formed on an end surface in contact with one of the objects to be joined, wherein
among the plurality of protrusions, at least a pair of protrusions arranged symmetrically at both outermost ends in a direction along the vibration direction are asymmetrical surface protrusions,
a cross-sectional shape perpendicular to a width direction of each of the asymmetrical surface protrusions is a triangle having a top of each of the asymmetrical surface protrusions as a vertex,
among two side surfaces of each of the asymmetrical surface protrusions, an inclination angle of one of the two side surfaces inclined toward an outer side of the protrusions and recesses is defined as an outer inclination angle, and an inclination angle of the other of the two side surfaces inclined toward an inner side of the protrusions and recesses is defined as an inner inclination angle,
an angle value of the outer inclination angle is smaller than an angle value of the inner inclination angle, and
an area of a first side surface of a first protrusion among the plurality of protrusions is smaller than an area of a second side surface of the first protrusion, wherein the first protrusion is adjacent to one of the asymmetrical surface protrusions, the first side surface faces towards the one of the asymmetrical surface protrusions, and the second side surface is opposite to the first side surface.
2 . The horn according to claim 1 , wherein
a cross-sectional shape perpendicular to a width direction of at least one protrusion from among the first protrusion and a second protrusion that is not the asymmetrical surface protrusions, among the plurality of protrusions, is an isosceles triangle having a top of the protrusion as a vertex.
3 . The horn according to claim 2 , wherein
a sum of the angle value of the outer inclination angle and the angle value of the inner inclination angle is the same as an angle value of a vertex angle of the at least one protrusion that is not the asymmetrical surface protrusions.
4 . The horn according to claim 2 , wherein
a sum of the angle value of the outer inclination angle and the angle value of the inner inclination angle is larger than an angle value of a vertex angle of the at least one protrusion that is not the asymmetrical surface protrusions.
5 . The horn according to claim 3 , wherein
the angle value set as the vertex angle of the at least one protrusion is in a range from 60 degrees to 160 degrees.
6 . The horn according to claim 5 , wherein
the angle value set as the vertex angle of the at least one protrusion is 140 degrees.
7 . The horn according to claim 1 , wherein
one of the side surfaces of each of the asymmetrical surface protrusions toward an outer side of the protrusions and recesses is perpendicular with respect to the end surface.
8 . An ultrasonic joiner that applies ultrasonic vibration to a plurality of objects to be joined sandwiched between a horn and an anvil from the horn, to join the plurality of objects to be joined to each other, wherein
the horn is the horn according to claim 1 .
9 . The horn according to claim 1 , wherein one of the side surfaces of each of the asymmetrical surface protrusions toward an outer side of the protrusions and recesses is non-perpendicular with respect to the end surface.
10 . A horn that applies ultrasonic vibration to a plurality of objects to be joined sandwiched between an anvil and the horn, to join the objects to be joined to each other, the horn comprising:
knurl-shaped protrusions and recesses that are formed of a plurality of protrusions each extending in a width direction perpendicular to a vibration direction of the horn, and that are formed on an end surface in contact with one of the objects to be joined, wherein
among the plurality of protrusions, at least a pair of protrusions arranged symmetrically at both outermost ends in a direction along the vibration direction are asymmetrical surface protrusions,
a cross-sectional shape perpendicular to a width direction of each of the asymmetrical surface protrusions is a triangle having a top of each of the asymmetrical surface protrusions as a vertex,
among two side surfaces of each of the asymmetrical surface protrusions, an inclination angle of one of the two side surfaces inclined toward an outer side of the protrusions and recesses is defined as an outer inclination angle, and an inclination angle of the other of the two side surfaces inclined toward an inner side of the protrusions and recesses is defined as an inner inclination angle,
an angle value of the outer inclination angle is smaller than an angle value of the inner inclination angle,
a cross-sectional shape perpendicular to a width direction of a protrusion that is not the asymmetrical surface protrusions, among the plurality of protrusions, is an isosceles triangle having a top of the protrusion as a vertex,
a sum of the angle value of the outer inclination angle and the angle value of the inner inclination angle is the same as an angle value of a vertex angle of the protrusion that is not the asymmetrical surface protrusions, and
the angle value set as the vertex angle of the protrusion is 140 degrees.