Ultrasound position input device

Details Ultrasound position input device Ultrasound position input device

1987-12-02

1989-03-21

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340706, 367907, G08C 2100

Patent

active

048145521

ABSTRACT:
This invention is an input device, or stylus, for entering hand drawn forms into a computer comprising a writing instrument, a pressure switch for determining whether the instrument is in contact with the writing surface, an acoustic transmitter for triangulating the position of the stylus on the surface, and a wireless transmitter for transmitting data and timing information to the computer. In operation, the stylus transmits an infra red signal which the system receives immediately, and an ultra sound pulse which two microphones receive after a delay which is a function of the speed of sound and the distance of the stylus from each microphone. From this information the system can calculate the position of the stylus. Switches for indicating functions are mounted on the stylus. Multiple stylusses can be used, each transmitting a distinctive identification code so that the system can determine which stylus is the signal source.

REFERENCES:
patent: 3626483 (1969-12-01), Whetstone et al.
patent: 3838212 (1974-09-01), Whetstone et al.
patent: 4246439 (1981-01-01), Romein
IEEE Transactions on Communications, vol. COM-25, No. 11, Nov. 1977, pp. 1433-1440, New York, US; C. N. Judice: "Digital Video: A Buffer-Controlled Dither Processor for Animated Images", *Sections 2, 6; FIG. 1.*
Proceedings of the S.I.D., vol. 17, No. 2, 2nd Quarter 1976, pp. 115-121; B. Lippel: "Two-and Three-Dimensional Ordered Dither in Bi-Level Picture Displays", *Sections III, V.*
Pieter de Bruyne, Compact Large-Area Graphic Digitizer for Personal Computers, Dec. 1986, pp. 49-53, IEEE.
L. G. Roberts, The Lincoln Wand, 1966, Fall Joint Computer Conference, pp. 223-227.
A. Bremmer & P. D. Bruyne, A Sonic Pen: A Digital Stylus System, Jun. 1970, IEEE Transactions, pp. 546-548.
Scriptal Technical Report, Jan. 1985, Report No. SPD-TR2.
Sep. 9, 1985, Electronic Engineering Times, p. 84, "3-D Ultrasonic Input System Competes with Movs, Tablet".

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