Patent ID: 7511585

Claim:
An automatic page detector, consisting: a time base oscillator, providing the system clock to a microprocessor; an array of sensor plates, each sensor is locating on each page of a book; an array of LC oscillators, each LC oscillator of said array of LC oscillators consists of an amplifier, an input capacitor, an output capacitor and an inductor, said inductor is coupled to one sensor plate of said sensor plates array on each page of a book, the frequency of said LC oscillator is determined by the inductance of said inductor and the capacitance of said input capacitor and said output capacitor, the distance between said inductor and said sensor plate will affect the inductance of said inductor and the frequency of said LC oscillator, the outputs of said LC oscillators are connected to the inputs of a microprocessor; a microprocessor, calculating and processing the frequency counts for every said LC oscillators, comparing the frequency counts with the reference counts for each LC oscillators, such that which page of a book is opened can be determined.