Coordinate input device with display

Details Coordinate input device with display Coordinate input device with display

1984-12-21

1989-07-04

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

178 18, 340706, G01B 714

Patent

active

048454788

ABSTRACT:
A coordinate input device with a display includes a position detecting tablet having a plurality of X-direction magnetostrictive transmission mediums and a plurality of Y-direction magnetostrictive transmission mediums superposed orthogonally, a first coil wound around one end of the array of magnetostrictive transmission mediums, and a second coil wound over substantially the entire lengths of the magnetostrictive transmission mediums. A position indicated on the tablet by a position indicating magnetism generator is detected by measuring the length of time between the moment at which a pulse current is applied to one of the first and second coils and the moment at which the voltage induced in the other of the first and second coils by a magnetostrictive vibration wave exceeds a threshold value owing to the sudden increase of voltage observed when the wave passes the indicated position. The coordinate input device further has a display unit which is superposed on the tablet and is adapted to directly display the position indicated on the tablet at the corresponding position thereon.

REFERENCES:
patent: 3087140 (1963-04-01), O'Neill
patent: 4273954 (1981-06-01), Takeuchi et al.
patent: 4298772 (1981-11-01), Kobayashi et al.
patent: 4420896 (1983-12-01), Castleberry
patent: 4514688 (1985-04-01), Whetstone
patent: 4520357 (1985-05-01), Castleberry et al.
patent: 4617515 (1986-10-01), Taguchi et al.
patent: 4634973 (1987-01-01), Murakami et al.
patent: 4639720 (1987-01-01), Rympalski et al.

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