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. 19, 1996
Filed:
Sep. 08, 1995
Applicant:
Inventors:
Hiromi Tomiyama, Musashimurayama, JP;
Satoru Nagai, Iruma, JP;
Assignee:
Kabushiki Kaisha Shinkawa, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ; G01B / ;
U.S. Cl.
CPC ...
356372 ; 356376 ; 25055934 ;
Abstract
The height of a wire bonded between a semiconductor chip and a lead frame being determined using an illumination from circularly arranged LED's installed in a low-angle illuminating device. The angle of the illumination is set at seven (7) to twelve (12) degrees, preferably at ten (10) degrees, with respect to a horizontal plane, and a focal depth of an optical device is set to be shallow, thus letting a dark area appear in the central portion of the wire at the focal point of the optical system.