Wireless digitizer and stylus pen unit

Details Wireless digitizer and stylus pen unit Wireless digitizer and stylus pen unit

1995-01-20

1997-01-14

Chin, Wellington

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

055942156

ABSTRACT:
A digitizer and stylus pen unit including a winding type conductor loop, a conductor pen or cursor, and a central processing unit, wherein when the signal input device is started to provide an oscillatory signal and a TX/RX control signal to a TX/RX control circuit for driving the winding type conductor loop, the central processing unit scans the transmission through a scanning circuit and the winding type conductor loop carries the oscillatory signal to the stylus pen, causing the stylus pen induced; the signal obtained from the relative position between the winding type conductor loop and the induced stylus pen is treated through signal amplifiers and filters, and then divided into two signals, permitting a first signal to be transmitted through two ways, to be transmitted through a gain amplifier, a schmitter trigger, and a data counter, and then to the central processing unit through a data buffer for calculating the X-axis and Y-axis coordinate values, and permitting a second signal to be transmitted through a voltage level hold circuit and an A/D converter to the central processing unit via a data buffer for calculating the Z-axis coordinate value.

REFERENCES:
patent: 4210775 (1980-07-01), Rodgers et al.
patent: 4707845 (1987-11-01), Krein et al.
patent: 4723056 (1988-02-01), Tamaru et al.
patent: 4837716 (1989-06-01), Chia-Hui
patent: 5023408 (1991-06-01), Murakami et al.
patent: 5218174 (1993-06-01), Gray et al.

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