Dark field lighting testing device
US7701569B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2007 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Jun 30, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/87
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dark field lighting testing device, for detecting a surface defect of an object having mirror surfaces, includes a cavity, the interior surface of which is made of a light-absorbing material; an opening arranged on a top of the cavity; a tape body arranged on the interior surface of the cavity; a plurality of lighting elements arranged on the tape body and electrically connected to each other; and a plate body arranged right above the opening of the cavity. During testing procedure, light emitted from each lighting element is incident upon the surface of the tested object, from which the diffusively reflected or refracted light forms an image on the surface of the plate body, thus a defect on the surface of the tested body and a position thereof being able to be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.