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. 26, 1991
Filed:
Dec. 14, 1989
Dieter Seipler, Reutlingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To adhere a semiconductor chip or wafer substrate (10) to a carrier plate substrate (11) of, for example, ceramic, glass or the like, in which the two substrates carry exposed connection pads (13, 16), at least one of the substrates is coated with an adhesive electrically insulating, normally tacky material, which is exposed, by photo-masking technology, in all areas except those where the pads are located, to cure the material. Metallic powder, typically silver, is then introduced into the remaining tacky portions of the layer, to render it conductive, and the two substrates are then pressed against each other, with the pads in alignment, the metal powder within the tacky insulating material forming an electrical connection between said pads. The insulating layer can be applied either to the semiconductor chip or wafer substrate or to the carrier plate substrate, or to both. Electrical connecting lines to the pads, on the surface of one of the substrates, are covered by the then cured electrical insulating layer. Preferably, the surface, and the connecting lines thereon, if used, are passivated before application of the adhesive layer which, then, is cured, except in the location of the pads.