Testing method for a polarizing plate
US7154601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2004 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Jul 23, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The testing method for a polarizing plate includes the following two types of testing: a selected light beam passing through a filter, a polarizer, a concave lens and a filter, a mirror, a concave lens and finally to a sample of a polarizing plate; the sample is rotated along z-axis to ascertain that if there is any variation of shade in an optical domain, in order to differentiate defective samples from qualified ones. By applying the method, gooseflesh in the sample is ascertained by naked eyes easily while feeding; the checking result can be reflected to a factory owner. The test cost is low and requires only inexpensive instruments. Moreover, an additional processing of polarizing plate is needless.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.