Track ball coordinate data inputting device

Details Track ball coordinate data inputting device Track ball coordinate data inputting device

1993-12-10

1995-09-05

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345167, G08C 2100, G09G 500

Patent

active

054480230

ABSTRACT:
A track ball coordinate data inputting device includes a coordinate data inputting ball rotatably accommodated in an accommodating portion of a frame; a pair of drivers abutted against the ball in two directions forming right angles, the drivers respectively having a rotary shaft supported at one end thereof, respectively; a pair of detecting members for detecting an amount of rotation of the ball, the detecting member including: a pair of encoders mounted near one end of the rotary shafts of the drivers, respectively; a pair of photo-sensers provided for the encoders, respectively, each photo-senser having a light emitting member and a light receiving member which are confronted with each other through the respective encoder; and a holding device for holding the other end of the rotary shafts; and an urging device for urging the other end of the rotary shafts to push the drivers against the ball.

REFERENCES:
patent: 4952919 (1990-08-01), Nippoldt
patent: 4973176 (1990-11-01), Dietrich
patent: 5171978 (1992-12-01), Mimlitch et al.
patent: 5187468 (1993-02-01), Ganthwaite et al.
patent: 5298916 (1994-03-01), Sato et al.

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