Vibration sensing device

Details Vibration sensing device Vibration sensing device

1996-07-02

1998-06-02

Saras, Steven

Telegraphy

Systems

Position coordinate determination for writing

178 19, 345177, G08C 2100, G09G 302

Patent

active

057603464

ABSTRACT:
There is provided a highly precise coordinate input device not requiring a particular designating tool. A sheet, composed of a piezoelectric plate polarized in the direction of thickness, is superposed with a vibration transmitting plate, provided with vibration sensors in predetermined positions. The sheet generates vibration by a pulse signal generated by a sheet driver. When the sheet is pressed for example with a pen, the vibration is transmitted to the vibration transmitting plate from the pressed position, and is detected by the vibration sensors. A controller calculates the distance between the vibration input point and the vibration sensor, based on the delay time from the start of vibration to the detection. This operation is conducted for the plural sensors, and the coordinate is calculated from thus calculated distances.

REFERENCES:
patent: 4886943 (1989-12-01), Suzuki
patent: 5352856 (1994-10-01), Tanaka et al.
patent: 5362930 (1994-11-01), Yoshimura et al.
patent: 5410612 (1995-04-01), Arai et al.
patent: 5484967 (1996-01-01), Yanagisawa
patent: 5539160 (1996-07-01), Tokioka et al.
patent: 5541370 (1996-07-01), Matsuda
patent: 5561613 (1996-10-01), Kobayashi

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