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:
May. 05, 1998
Filed:
Jul. 19, 1996
Takashi Nishimura, Mito, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An apparatus, for producing an object having an asymmetric and aspherical surface, includes a rotary table on which a workpiece is attached at a peripheral part, the rotating table rotating on a rotation shaft, a rectilinear motion table for moving the rotating table in one direction, a grind unit for grinding the workpiece using a grinding part supported by a spindle movable in a sub-scanning direction of the workpiece and contacting the workpiece, a support arm for swinging the grinding part together with the spindle with a circular arc motion in the sub-scanning direction of the workpiece, a data storage unit for storing data which prescribes a target shape of the workpiece, a shape measurement unit for measuring the shape of the workpiece attached at the rotary table, and a control unit for controlling the above-described mechanisms and units. The control unit compares date, measured by the shape measurement unit, of a shape of the workpiece which is being ground, with the stored data prescribing the target shape of the workpiece, and controls grinding of the workpiece so that the measured shape of the workpiece conforms to the shape prescribed by the stored data, based on results of the comparison.