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. 09, 1987
Filed:
Dec. 27, 1985
Rand C Sherman, Holmdell, NJ (US);
Stanley Electric Company, Ltd., Yokahama, JP;
Abstract
The bonding of a lead wire on a semiconductor having an ohmic contact metal electrode provided locally on a surface at a selected location is achieved through detecting the image of the metal electrode more precisely by enhancing the contrast between the metal electrode and the semiconductor surface. The enhanced contrast is accomplished by illuminating the contact-carrying surface at Brewster's angle with a beam of light rays having a wavelength in the range of the light transmission coefficient of the semiconductor material constituting the chip, and polarizing either the illuminating beam or the reflected beam or both to produce a difference in intensity of light between the contact and the light reflected from the semiconductor area. The illuminating light beam may be passed through a filter means to render a narrow frequency beam of light rays. The enhanced contrast reflecting beam is detected and converted to an electronic signal which is digitized and connected to servomechanisms that move the lead wire into bonding contact with the metal electrode.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile