Image forming apparatus and optical sensor with multiple light-receiving and light-emitting elements
US11126104B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 2019 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Sep 6, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0626
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An image forming apparatus includes an optical sensor configured to detect an image formed on an intermediate transfer belt. The optical sensor includes a first light emitting diode (LED), a second LED, a first photodiode (PD), and a second PD on a substrate. The first PD is arranged at a position at which specularly reflected light of light emitted from the first LED can be received, and scattered reflected light of light emitted from the second LED can be received. The second PD is arranged at a position at which scattered reflected light of light emitted from the second LED can be received. A light receiving surface of the first PD and a light receiving surface of the second PD are formed at different angles. The light receiving surface of the first PD has an area that is smaller than an area of the light receiving surface of the second PD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.