Ultrasonic inspection of joined portions of packaging containers
An ultrasonic inspection device is used for inspecting a packaging container having a joined portion including overlapping and joined edges of the packaging container. The ultrasonic inspection device includes a transmitter configured to irradiate ultrasonic waves toward at least a base end portion of the joined portion in a state in which the joined portion protrudes from a surface of an object in a direction orthogonal to the surface, the base end portion being positioned on a side of the object. The ultrasonic inspection device further includes a plurality of receivers configured to receive the ultrasonic waves transmitted through the joined portion.
1 . An ultrasonic inspection device for inspecting a packaging container having a joined portion including overlapping and joined edges of the packaging container, comprising:
a transmitter configured to irradiate ultrasonic waves; and
a plurality of receivers, each of the plurality of receivers having a reception surface configured to receive ultrasonic waves that have transmitted through the joined portion,
wherein the transmitter comprises:
a transmission main body that irradiates the ultrasonic waves; and
a mirror configured to reflect first ultrasonic waves irradiated from the transmission main body,
wherein the transmission main body comprises an irradiation surface that irradiates the ultrasonic waves, the irradiation surface comprising an inner region that irradiates the first ultrasonic waves and a peripheral region disposed outside the inner region and that irradiates second ultrasonic waves, and
wherein the mirror is arranged such that:
the mirror reflects the first ultrasonic waves irradiated from the inner region of the irradiation surface without reflecting the second ultrasonic waves irradiated from the peripheral region of the irradiation surface, and
the first ultrasonic waves irradiated from the inner region of the irradiation surface and reflected by the mirror travel to at least a base end portion of the joined portion.
2 . The ultrasonic inspection device according to claim 1 , wherein the plurality of receivers are arranged in a matrix shape or in an array shape in a direction that intersects a direction in which the ultrasonic waves travel toward the joined portion.
3 . The ultrasonic inspection device according to claim 1 ,
wherein the mirror is arranged such that the second ultrasonic waves irradiated from the peripheral region of the irradiation surface and not reflected by the mirror pass between the mirror and the joined portion.
4 . The ultrasonic inspection device according to claim 1 ,
wherein the mirror is arranged such that the second ultrasonic waves irradiated from the peripheral region of the irradiation surface and not reflected by the mirror pass on opposite sides of the mirror from each other.
5 . The ultrasonic inspection device according to claim 1 , wherein the transmitter is configured to irradiate ultrasonic waves toward at least the base end portion of the joined portion in a state in which the joined portion protrudes from a surface of a non-joined part of the packaging container in a direction orthogonal to the surface.
6 . The ultrasonic inspection device according to claim 1 , wherein the transmitter is configured to irradiate ultrasonic waves toward at least the base end portion of the joined portion, the joined portion including an open end of a cup-shaped member joined together with a sheet-shaped member and protruding from an outer surface of a side wall portion of the cup-shaped member in a direction orthogonal to the outer surface.
7 . The ultrasonic inspection device according to claim 1 , wherein the transmitter is configured to irradiate ultrasonic waves toward at least the base end portion of the joined portion in a state in which the joined portion protrudes from a surface of a non-joined part of the packaging container in a direction orthogonal to the surface, and
wherein the joined portion of the packaging container is a portion that protrudes downward from a lower surface of a support base that is a base for supporting the packaging container in an apparatus for manufacturing the packaging container or an apparatus for transporting the packaging container.