US 12,270,767 B2
Method and device for optically testing hollow bodies
Michel Hurni, Biel/Bienne (CH); Pascal Choquard, Brügg b. Biel (CH); Beat Schlup, Biberist (CH); and Hansjörg Klock, Worb (CH)
Assigned to Finatec Holding AG, Brügg b. Biel (CH)
Appl. No. 17/628,074
Filed by Finatec Holding AG, Brügg b. Biel (CH)
PCT Filed Aug. 3, 2020, PCT No. PCT/EP2020/071801
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/023706, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 980/19 (CH), filed on Aug. 2, 2019.
Prior Publication US 2022/0260502 A1, Aug. 18, 2022
Int. Cl. G01N 21/90 (2006.01); G01N 21/3563 (2014.01); H04N 23/74 (2023.01); H04N 23/90 (2023.01)
CPC G01N 21/90 (2013.01) [G01N 21/3563 (2013.01); H04N 23/74 (2023.01); H04N 23/90 (2023.01)] 21 Claims
OG exemplary drawing
 
1. Method for optical testing of hollow bodies, in which a hollow body is conveyed by means of a transport device at a transport speed, whereby an image of a side wall surface of the hollow body is generated by means of an inspection unit comprising at least one camera unit and at least one illumination unit,
wherein a plurality of inspection units are arranged so that an inspection volume is able to be spanned, in which an image of the entire side wall surface of the hollow body as well as a bottom and a mouth region is independently generated by at least one of a transmitted light method, an incident light method, a dark field method, and combinations thereof,
wherein the camera unit of the inspection unit is arranged to take a serial sequence of pictures in each time interval, which, at a given transport speed, represents a distance corresponding to a fraction of the size of the container,
wherein the images of the hollow body and the serial sequence of pictures are evaluated to detect defects in the hollow body including at least one of contour, slugs, holes, pinholes, thin wall areas, thick wall areas, cracks, scratches, streaks, bubbles and non-melted areas.