Touch panel device

Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel

Reexamination Certificate

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Details

C178S018040, C310S31300R

Reexamination Certificate

active

06911973

ABSTRACT:
A touch panel device is provided that can detect a touched position with sufficient resolution and accuracy without requiring high accuracy in process for forming a piezoelectric thin film. In the middle portion of the glass substrate, a substantially rectangular touch area is provided. In the periphery of the touch area, plural transmission comb electrodes arranged along one of the neighboring sides of the touch area and plural reception comb electrodes arranged along the other of the neighboring sides make pairs. Surface acoustic wave signals propagate from the transmission comb electrodes to the reception comb electrodes in a slanting direction with respect to four sides of the touch area. The inside edge of the piezoelectric thin film is formed linearly along the sides of the touch area. Each of the comb electrodes13and14are arranged so that the line along the electrode finger of the transmission comb electrode and the line along the electrode finger of the reception comb electrode are non-parallel with each other in accordance with an angle of refraction of the surface acoustic wave at the boundary between the piezoelectric thin film and the touch area.

REFERENCES:
patent: 4456847 (1984-06-01), Minagawa et al.
patent: 5717434 (1998-02-01), Toda
patent: 5852261 (1998-12-01), Toda
patent: 5854450 (1998-12-01), Kent
patent: 5886452 (1999-03-01), Toda
patent: 6590569 (2003-07-01), Toda
patent: 40 11 978 (1990-10-01), None
patent: 4011978 (1990-10-01), None
patent: 0 397 539 (1990-11-01), None
patent: 358033783 (1983-02-01), None
patent: 360140325 (1985-07-01), None
PTO 04-0802: English Translation of Shiba, DE 4011978, Oct. 1990, translated Dec. 2003 by FLS, Inc.
European Search report dated Aug. 8, 2003 in corresponding European Patent Office Application No. EP 01 30 9504.

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