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. 13, 2000
Filed:
Mar. 19, 1998
Hiroshi Maeda, Kawasaki, JP;
Yoshifumi Mizoshita, Kawasaki, JP;
Toshiyuki Satoh, Kawasaki, JP;
Takahiro Imamura, Kawasaki, JP;
Toru Kohei, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A compact and simple lapping apparatus in which, even if projections and depressions are formed in the circumferential direction on the top surface of a lapping plate, a workpiece and a bar are hard to damage and the polished surface of the workpiece is kept in good condition. This apparatus is provided with at least one lapping jig in which a workpiece is placed on the rotating top surface of the lapping plate. Further, a lapping head adapted to be able to rotate only in a direction on the lapping plate is attached to this lapping jig. This lapping head is equipped with a workpiece and at least two dummy work materials (or stock) so that these dummy works compose (as-polished) surfaces, which should be polished, together with the workpiece. Moreover, a device for detecting the remaining part of the workpiece to be lapped is provided on the workpiece. Furthermore, this lapping apparatus is configured so that a detection signal, which represents the detected remaining part of the workpiece and is outputted from the rotating lapping head, is sent to and a correction signal is sent from a control unit to the lapping correction device through a slip ring. A workpiece is polished while rotated on the lapping plate. Thus, the polished surface of the workpiece is kept in good condition.