Ultraviolet light permeable filter for flaw detection light, and method for detection of flaws
US6525315B1 · kind B1 · utility
5Cited by
3References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 14, 2000 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Jun 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/283
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultraviolet light permeable filter for an ultraviolet detection light is equipped on a filter glass surface with a dielectric multi-film layer which allows a visible radiation of wave length from 694 nm to 780 nm to reflect on the layer. The wave length also does not penetrate through the multi-flim layer. This filter prevents a reddish halation occurrence during an inspection display of a flaw detection light, which is the main cause of overlooking a scratch or flaw pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.