Telegraphy – Systems – Position coordinate determination for writing
Patent
1991-05-06
1992-08-11
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
051381184
ABSTRACT:
An inductive pen (16) repetitively transmits pulses of an oscillatory signal having a characteristic frequency. Pen state information, such as pen tip contact switch information, are encoded by a number of techniques. These techniques include pulse width modulation or pulse position modulation, so as to convey pen state information to a digitizing tablet in a manner that does not adversely affect pen position determinations. The pen state information may also be encoded on the oscillating signal by Frequency Shift Keying (FSK), Phase Shift Keying (PSK), or Amplitude Modulation (AM). A digitizer tablet (10) includes circuitry for detecting the transmitted pen state information, the circuitry accommodating the selected modulation scheme. The tablet is responsive to the transmitted pulses for placing tablet circuitry in a low-power consumption state between pulses so as to conserve tablet power.
REFERENCES:
patent: 3626483 (1971-12-01), Whetstone et al.
patent: 3819857 (1974-06-01), Inokuchi
patent: 3875331 (1975-04-01), Hasenbalg
patent: 3886311 (1975-05-01), Rodgers et al.
patent: 4227044 (1980-10-01), Fencl
patent: 4268730 (1981-05-01), Higgins et al.
patent: 4368351 (1983-01-01), Zimmer
patent: 4532376 (1985-07-01), Rockwell
patent: 4542261 (1985-09-01), Behnke
patent: 4665282 (1987-05-01), Sato et al.
patent: 4667182 (1987-05-01), Murphy
patent: 4672154 (1987-06-01), Rodgers et al.
patent: 4695680 (1987-09-01), Kable
patent: 4786765 (1988-11-01), Yamanami et al.
patent: 4868351 (1989-09-01), Watanabe et al.
patent: 4883926 (1989-11-01), Baldwin
patent: 4902858 (1990-02-01), Yamanami et al.
patent: 4975546 (1990-12-01), Craig
International Business Machines - Corporation
Schreyer Stafford D.
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