Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1995-09-14
1997-07-29
Dye, Rena
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345164, 428 341, 428 357, 428192, G09G 508
Patent
active
056526040
ABSTRACT:
The present invention provides a hollow track ball which includes a first hemispherical shell having a first annular end having thereon a plurality of positioning studs, and a second hemispherical shell having a second annular end having thereon a plurality of positioning holes for respectively engaging with the plurality of positioning studs so as to result in a hollow track ball. A method for manufacturing such a track ball includes steps of a) providing a first hemispherical shell having a first annular end having thereon a plurality of positioning studs, and providing a second hemispherical shell having a second annular end having thereon a plurality of positioning holes, and b) causing the plurality of positioning studs and the plurality of positioning holes to engage with each other so as to result the respective hemispherical shells in the hollow track ball. Such a hollow track ball not only avoids the conventional slant joint seam, but also greatly reduces the reject rate of the products.
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Dye Rena
Primax Electronics Ltd.
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