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:
Oct. 20, 1992
Filed:
Aug. 15, 1989
Applicant:
Inventors:
Shunji Maeda, Yokohama, JP;
Hitoshi Kubota, Fujisawa, JP;
Satoru Fushimi, Yokohama, JP;
Takashi Hiroi, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
382-8 ; 382 22 ; 382 21 ; 358107 ; 358106 ;
Abstract
A system and a method of detecting a chipping of the rail part of a slider of a thin film magnetic head obtains the image of the object of detection and its boundary coordinates by tracing the boundary of the object of detection from the image. A chipping size is obtained from the coordinates of the points on the boundary, and the presence or absence of chipping is judged from the chipping size, thereby enabling the highly precise detection of a chipping defect generated on the boundary portion of the object of detection using a simple structure.