High intensity light shut-down circuit for night vision goggle
US4755725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Feb 27, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/98
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for automatically removing battery power from a night vision goggle (10) upon its detachment from a headgear (12) or when subjected to excessive light. A magnet (34) on the headgear (12) is magnetically coupled to a magnetic reed switch (36) fixed to the goggle (10). On detachment of the goggle (10) from the headgear (12), the reed switch (36) switches battery current to a goggle location monitor (75) for drilling on/off control logic (79) to remove power from an image intensifier tube (40). A high intensity light monitor (80) senses when the ambient light exceeds a predefined intensity, for a predetermined period of time, and also drives the control logic (79) to open a switch (86) in series with the battery (38) and the image intensifier tube (40). A low voltage monitor (82) provides a visual indication (84) of reduced battery voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.