Indicating desiccant in night vision goggles
US8854220B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2010 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Jul 24, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A night vision goggle system includes a housing, and an eyepiece forming a back end of the housing for viewing an object of interest. An optical field-of-view (FOV) is formed through the eyepiece, where the FOV is defined by a cone having an apex formed adjacent to an exit pupil at the eyepiece and tapering outwardly toward the object of interest. A desiccant is disposed within the housing, and located outside the FOV. The desiccant is visible through the eyepiece when viewed from outside the FOV. In addition, when the eye of a user is placed within the FOV, the desiccant is not visible through the eyepiece; and when the eye of the user is placed outside the FOV, the desiccant is visible through the eyepiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.