Wireless and passive tablet for inputting to computer

Details Wireless and passive tablet for inputting to computer Wireless and passive tablet for inputting to computer

2003-04-18

2009-11-24

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C178S018070

Reexamination Certificate

active

07623120

ABSTRACT:
This invention refers to peripheral equipment of a computer and is a wireless and passive tablet for inputting to the computer that converts the track of handwriting to digital X, Y coordinates and then inputs it to the computer and then displays the track on screen of the computer. The characteristic of the wireless and passive tablet is using the coil of X, Y direction in transmitting and receiving. A square wave is generated and input to a transmitting circuit. A transmitted electromagnetic wave is inputted to a circuit of a pen to form resonance that will be outputted to a receiving circuit. The receiving circuit connects to an amplifying circuit to amplify the signal and input the amplified signal into a phase angle detecting circuit and an amplitude detecting circuit respectively to control the phase angle and amplitude. And then the signal is inputted to a primary CPU to realize the writing function of the wireless pen.

REFERENCES:
patent: 4609776 (1986-09-01), Murakami et al.
patent: 5557076 (1996-09-01), Wieczorek et al.
patent: 5646377 (1997-07-01), Oda
patent: 6184864 (2001-02-01), Chao
patent: 6476799 (2002-11-01), Lee et al.
patent: 2002/0056577 (2002-05-01), Kaye et al.
patent: 2487024 (2002-04-01), None

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