Light detection device
US10612973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2018 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Sep 7, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light detection device has light receiving parts, edge detection circuits and an addition unit. Each light receiving part has a quench resistance, a SPAD and a pulse signal output part. The SPAD responses incident photons, i.e. incident light. The quench resistance and pulse signal output part generate and transmit a pulse signal to a corresponding edge detection circuit when the SPAD receives and responds to the incident light. The edge detection circuits and the addition unit detects the number of edges during a period from a previously received CLK signal to a currently received CLK signal every time it receives a CLK signal transmitted at a predetermined period. The edge represents a state change from a first state which receives no pulse signal to a second state which receives the pulse signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.