Light detecting and angle of view compensation for optical devices and method
US7501613B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2004 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Jul 8, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13318
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A control for a controllable optical device, such as an auto-darkening lens (ADL), such as used in welding helmets, respirators, or other device, includes a sensor sensing the direction of incident light and a control circuit responsive to incident direction information to provide for control of the optical device. Based on at least one of incident direction of light and light intensity a the shade characteristics of the ADL or the like can be controlled and maintained while a person wearing the ADL may move the head to different orientations. Several fixed photosensor arrangements and dynamic systems may be used to sense incident light direction and whether the incident light is a point source. A method of detecting direction of incident light and whether the incident light is from a point source, and of controlling an ADL or the like based on direction and/or intensity of incident light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.