Recording medium determination apparatus and image forming apparatus
US9429892B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2015 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | Apr 12, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00742
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The recording medium determination apparatus includes a transmission unit for transmitting an ultrasonic wave, a receiving unit for outputting a signal corresponding to the ultrasonic wave, a peak extraction unit for detecting a value of the signal output from the receiving unit, a control unit for determining basis weight of a recording medium based on the value of the signal, and a timer for measuring a period of time from when the transmission unit transmits the ultrasonic wave to the detection by the peak extraction unit. The control unit calculates, based on a period of time measured by the timer at the time of factory shipment and a period of time measured by the timer after the factory shipment, variation of a distance between the transmission unit and the receiving unit after the factory shipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.