Automatic page detector
US7511585B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 2007 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Sep 12, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B5/062
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention discloses an automatic page detector, to determine which page of a book is open. The automatic page detector uses a sensor plate and an inductor as a sensor. In the invention, there is a sensor plate at each page of the book and the locations of the sensor plates for different pages are different. There is an array of inductors just beneath the sensor plates when the book is closed. The inductors are connected to the feedback loop of a LC oscillator through analog switches. The proximity of a sensor plate to an inductor will change the frequency of the LC oscillator. Scanning the analog switches by a microprocessor and detecting the variation of frequency of the LC oscillator during each scanning time period, the status of each sensor plate will be detected and we can determine which page of a book is opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.