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:
Dec. 11, 2007
Filed:
Jul. 01, 2005
John Paul Harris, Jr., Whitewright, TX (US);
John Paul Harris, Jr., Whitewright, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The invention provides apparatus and methods for sawing and singulating individual devices from a silicon or glass-bonded semiconductor wafer. Using methods of the invention, wafer device singulation includes a step of sawing kerfs approximately coinciding with the peripheries of numerous devices arranged on a wafer. Kerfs are also sawn into the opposite side of the wafer approximately opposing the first kerfs. Mechanical stress is applied to the wafer causing controlled breakage of the intervening wafer material, severing each of the devices from its neighbors. A saw blade apparatus of the invention provides enhanced cutting characteristics and is particularly suited for glass-bonded semiconductor wafer device singulation. The saw blade has a diamond disc suitable for high-speed rotation about its axis. The saw blade of the invention also preferably has a radiused cutting edge, and an annular gutter symmetrically disposed about the circumference on each of the opposing planes of the disc.