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:
Nov. 05, 1996
Filed:
Jul. 20, 1994
Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;
Abstract
When a cylinder unit is actuated to extent its rod upwardly, a chuck is lifted above an inner cup to receive a planar workpiece such as a semiconductor wafer or a glass substrate. The chuck is now disengaged from the inner cup, and a stopper locks the chuck against rotation. After the planar workpiece has been supported on the chuck, the cylinder unit is actuated to retract its rod, bringing the chuck into its lowered position. The chuck is now engaged by the inner cup for corotation. Energization of a motor rotates the inner cup, which then rotates the chuck. Since the inner cup, which has a relatively large rotational inertia, is driven by the motor, interengaging portions of the inner cup and the chuck are less susceptible to damage.