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:
Jul. 14, 1992
Filed:
Apr. 02, 1991
Ephraim B Flint, Garrison, NY (US);
Edward J Yarmchuk, Somers, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and structure permit the precision alignment in the packaging of optical components, such as lasers, detectors, lenses and waveguides. The technique involves capacitance measurements of an array of plates placed on the optoelectronic device chip and its package substrate. The technique uses phase sensitive detection to sense the total current capacitively coupled into a passive plate on the device chip from two overlapping plates located on the package substrate. When the device chip is properly aligned with respect to the package substrate, the summed current sensed with a third overlapping plate on the package substrate is a null.