Lamb wave graphic tablet

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Lamb wave graphic tablet

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© The Institution of Electrical Engineers
Published

A graphic sensor based on the measurement of the propagation time of an acoustic wave train is described. Lamb waves are launched in a plate of ordinary glass by piezoelectric bars bonded to the edges of the plate. They are detected at their arrival under the tip of the drawing pencil by a small piezoelectric disc placed in the pencil body. The useful area of the tablet is 19×27 cm2; the resolution is about 0.2 mm.

Inspec keywords: surface acoustic wave devices; computer graphic equipment; piezoelectric devices; position measurement

Other keywords: Lamb waves; acoustic wave propagation time measurement; resolution; graphic sensor; drawing pencil; Lamb wave graphic tablet; plate of ordinary glass; computer graphics; 27 cm; bonded piezoelectric bars

Subjects: Terminals and graphic displays; Acoustic wave devices; Spatial variables control; Spatial variables measurement

References

    1. 1)
      • I.A. Viktorov . (1967) , Rayleigh and Lamb waves.
    2. 2)
      • : `Siemens AG', P 2115367.3, 30 March 1971, German patent.
    3. 3)
      • A. Ishii , S. Hashimoto . Graphic sensor using a Lamb wave. IEEE ultrason. symp. proc. , 167 - 170
    4. 4)
      • : `Summagraphics Corporation', 422049, 12 May 1973, US patent.
    5. 5)
      • E. Dieulesaint , D. Royer , B. Thiriet , J.C. Ballegeer . SAW graphic sensor. IEEE ultrason. symp. proc. , 198 - 200
    6. 6)
      • P.W. Woo . A proposal for input of hand-drawn information to a digital system. IEEE Trans. , 609 - 611
    7. 7)
      • E. Dieulesaint , D. Royer , J.C. Ballegeer . SAW co-ordinates sensor. Electron. Lett. , 586 - 587
    8. 8)
      • Davis, M.R., Ellis, T.O.: `The Rand tablet: a man-machine graphical communication device', Fall joint computer conference, 1964, Baltimore, MD, Spartan Books, p. 325.
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