Computer graphic drawing apparatus with coarse and fine controls
Patent 4891632 Issued on January 2, 1990. Estimated Expiration Date: 
January 20, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 20, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3541521 Input device featuring both trackball and mouse capability Integrating pointing device Multiple function control member Patent #: 4748441 InventorAssigneeApplicationNo. 146293 filed on 01/20/1988US Classes:345/165, Photosensor encoder178/18.03Writing digitizer padExaminersPrimary: Brigance, Gerald L.Attorney, Agent or FirmForeign Patent References
International ClassG09G 001/00AbstractAn improved computer graphic drawing apparatus having a housing unit adapted for being held in hand during graphic drawing operations, a coarse adjusting device movably disposed in the housing unit, and an IC arrangement disposed in the housing unit and electrically connected to the coarse adjusting device for being coupled with a host computer. The improvement resides in a few adjusting device movably disposed in the housing unit and includes: a tracking member movably installed on one side of the housing unit; a first and a second rotary member separately installed in the housing unit and rotatably engaged with the tracking member for being rotated on X and Y coordinate axes; and a first and a second encoding device respectively provided in the housing unit and electrically connected to the IC arrangement in conjunction with both rotary members so as to effect signal conversion and transmission in accomplishing fine adjustment operations. | |
