Minimal depth light filtering image sensor
US7608811B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 2004 |
| Grant date | Oct 27, 2009 |
| Priority date | — |
| Expiry date | May 21, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/8063
Abstract
A method and apparatus for directing light to a light sensor and filtering out an infrared component from the directed light. In one embodiment, the apparatus includes an array of light sensors disposed on a substrate, wherein the light sensors are operable to convert light intensity into a voltage signal. The apparatus further includes a cover plate disposed over the light sensors such that the cover plate creates a cavity over the array of sensors. The apparatus further includes filter material disposed between the cover plate and the light sensors in the cavity formed between the light sensors and the cover plate. The filter material is operable to filter the light passing through the cover plate. In particular, in one embodiment, light having wavelengths in the infrared range may be filtered out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.