Photodiode detector with integrated noise shielding
US6184521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jan 6, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/222
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A photodiode has integrated shields for the rejection of noise-producing electromagnetic interference and ambient light. The electromagnetic shield forms a conductive matrix which covers the photodiode active area. The matrix is deposited as a metallization layer onto the photodiode and provides exposed portions of the active area for light detection. A pad is electrically connected to the shield to allow external termination of the shield. The ambient-light shield is in the form of a colored encapsulant surrounding the photodiode. The encapsulant provides a high-pass light transmission characteristic which passes signal light and rejects out-of-band ambient light. The photodiode is particularly advantageous for use in pulse oximetry probes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.