Proximity sensor including reference detector for stray radiation detection
AssigneesSTMicroelectronics (Research & Development) Limited, STMicroelectronics (Grenoble 2) SAS, STMicroelectronics (Crolles 2) SAS
InventorsAdam Caley, Pierre-Jean Parodi-Keravec, Olivier Le Briz, Sandrine Lhostis
Life of this patent
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Abstract
A proximity sensor includes a radiation source configured to emit a primary radiation beam and a primary detector configured to pick up a reflected primary radiation beam. The radiation source is further configured to emit stray radiation. The sensor further includes a reference detector arranged to receive the stray radiation. The stray radiation may, for example, be emitted from either a side of the radiation source or a bottom of the radiation source.
Claims22
A proximity sensor, comprising:
- a radiation source configured to emit a primary radiation beam and;
- a primary detector configured to pick up a reflection of said primary radiation beam;
- and
- a reference detector co-located with the radiation source and configured to receive back emission stray radiation emitted from the radiation source.
12-17. (canceled)
An apparatus, comprising:
- a radiation source configured to emit a primary radiation beam, comprising:
- a first mirror and a second mirror provided at respective upper and lower sides of an active layer;
- wherein the reflectivity of said first and second mirrors permits back emission of radiation towards a substrate;
- a primary detector configured to pick up a reflection of the emitted primary radiation beam;
- and
- a reference detector mounted to said substrate and configured to receive said back emission of radiation.
Dependencies are inferred from the claim text.