The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2000
Filed:
Oct. 09, 1998
Applicant:
Inventor:
Ronald K Kerschner, Loveland, CO (US);
Assignee:
Hewlett Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
74 892 ; 74 8922 ;
Abstract
A differential motor drive for an XY stage comprising a fixed base and two moveable platforms where the platforms' movements are orthogonal with respect to each other. Both motors for the X and the Y stages are located on the fixed base and do not move with either of the moving platforms. As the motors rotate at substantially the same speed in substantially opposite directions only the Y stage moves. As the motors rotate at substantially the same speed in substantially the same direction only the X stage moves. As the motors rotate at different speeds in either the same or opposite directions, both the X and Y stages move.