Optical inspection of container dimensional parameters using a telecentric lens
US5461228A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Apr 7, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9054
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for inspecting the inside diameter of a container mouth that includes a light source for directing light energy into the container, and a light sensor disposed with respect to the source and the container to receive light energy transmitted out of the container through the mouth. A telecentric lens directs onto the light sensor light energy transmitted through the container mouth substantially axially of the container mouth. The light energy is focused through an iris onto a matrix array sensor, which develops a two-dimensional image of the container mouth. The matrix array sensor is coupled to image processing electronics for determining or calculating a circle of greatest diameter that will fit within the two-dimensional image of the container mouth, and treating such circle as indicative of the effective diameter of the container mouth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.