Telegraphy – Systems – Position coordinate determination for writing
Patent
1993-10-28
1995-01-31
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
345167, G09G 500, G08C 2100
Patent
active
053860896
ABSTRACT:
An object of this invention is to provide a track ball coordinate data inputting device in which means for holing supporting ball elements adapted to support the ball is simplified in structure, so that the supporting ball elements can be built in it with ease. In a track ball coordinate data inputting device, supporting ball element holding sections for holding supporting ball elements adapted to support a ball have inserting grooves which are each like a cut circle in section which is obtained by cutting a true circle equal in diameter to the supporting ball element with a chord shorter than the diameter. Each of the inserting grooves is engraved in the spherical inner wall surface of the accommodating section in such a manner that it is extended downwardly from the upper edge of the spherical inner wall surface and is wide enough to allow the passage of the supporting ball element. Each inserting grooves has a lower end portion formed into a lower surface receiving portion which has a spherical surface for receiving the supporting ball element, a lower wall portion formed into thin side surface receiving portions which are elastically flexible in a direction of groove width, and catching protrusions above the side surface receiving portions which are protruded inwardly of the inserting groove.
REFERENCES:
patent: 4952919 (1990-08-01), Nippoldt
Chin Stephen
Kim Kevin
Mitsumi Electric Co. Ltd.
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