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:
Sep. 12, 1989
Filed:
Nov. 03, 1988
Applicant:
Inventor:
Leslie L Burns, Saratoga, CA (US);
Assignee:
Lasa Industries, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; B23K / ; B44C / ;
U.S. Cl.
CPC ...
156627 ; 156643 ; 156654 ; 156662 ; 156345 ; 21912161 ; 2191218 ; 21912185 ;
Abstract
A method and apparatus for controlling the energy of a laser beam on a workpiece includes a photodetector for generating an electrical signal which is proportional to the light reflected from the workpiece. The energy of the laser beam at the workpiece is increased from some predetermined low level until the photodetector senses an abrupt change in the reflected light. This change represents a changed state in the workpiece material that is exposed to the laser beam. The energy level at which the change takes place is used as a reference level for further laser processing.