Patent Number: 8,796,628

Title: Method and apparatus for inspecting sealing defect of container

Abstract: A method for inspecting sealing defects of a container using infrared light. Infrared light in a wavelength range of 1450 nm.+-.20 nm is irradiated from a phototransmitter onto the sealed portion of a sample container Infrared light reflected from or transmitted through the sealed portion of the sample container is received by a photoreceiver, and transmitted to a photodetector through an optical fiber. The infrared light in a same wavelength range as the case of inspecting the sample container is irradiated onto the sealed portion of a container to be inspected. The infrared light reflected from or transmitted through the sealed portion of the inspected container is converted into the analog voltage value and transmitted to a controller. If the infrared light is reduced to be smaller than a threshold set on the basis of the sample container, the sealed portion of the inspected container is judged as a sealing defect.

Inventors: Ijuin; Taichi (Sagamihara, JP), Yamauchi; Tomio (Sagamihara, JP), Kawazoe; Akira (Sagamihara, JP), Takatomi; Tetsuya (Sagamihara, JP)

Assignee: Daiwa Can Company

International Classification: G01N 21/35 (20140101); G01M 3/38 (20060101); G01N 21/3563 (20140101)

Expiration Date: 8/05/12018