Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1994-01-21
1994-09-06
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345157, 74471XY, G09G 302
Patent
active
053452534
ABSTRACT:
A track ball base structure comprises a single-piece body having a housing being composed of a plurality of standing plates in the top of the body with extruding portions in the upper end of which to get secure connection to a cover, a central circular recess with an opening bottom to hold a ball therein, a plurality of ball bearing holes evenly distributed around the upper rim of the circular panel in the housing with an inner rectangular plate inside the uppermost of each hole for admitting ball bearings therein and at the same time holding them in place, multiple pairs of locking means and slots in both sides of the body for locking the detecting system as well as fixing the body substantially onto an integrated circuit plate. The present invention is characterized by providing a track ball base structure in a non-assembly manner. Therefore, the number of component parts required for the track ball is reduced and clearly any damage occurring under interconnection for each part can be eliminated.
REFERENCES:
patent: 4538476 (1985-09-01), Luque
patent: 4658666 (1987-04-01), Liu
patent: 4952919 (1990-08-01), Nippoldt
patent: 5208736 (1993-05-01), Crooks et al.
Behavior Tech Computer Corp.
Liang Regina
Oberley Alvin E.
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