Clear card sensors
US10793383B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 10, 2018 |
| Grant date | Oct 6, 2020 |
| Priority date | — |
| Expiry date | Oct 10, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/558
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An example method includes comparing, via circuitry, a first signal indicative of a first amount of light received by a first light sensor to a second signal indicative of a second amount of light received by a second light sensor, wherein the second light sensor is to compensate for an environmental change by detecting the second amount of light transmitted by a light source regardless of a presence or absence of an object in the conveyance path; determine, via the circuitry, whether a reflection loss is present based on the comparing of the first and second signals; and if the circuitry detects the reflection loss based on the comparing of the first and second signals, generating a presence indication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.