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. 29, 2009
Filed:
Sep. 30, 2008
Mihail Mihaylov, San Jose, CA (US);
Mihail Mihaylov, San Jose, CA (US);
Tokyo Electron Limited, Tokyo, JP;
Abstract
Provided is a method and system for auto focusing a workpiece in the Z-axis using a position sensitive focus detector. A focus detection beam is measured using a focus detector, the focus detector having an array of sensors, each sensor of the array of sensors having a sensor identification, the focus detector measuring the focus detection beam projected on a plurality of sensors in the array of sensors, generating a corresponding focus signal for each sensor in the array of sensors. The plurality of focus signals and associated sensor data is used to generate a best focus instruction which is used to move the workpiece to the best focus position on the Z-axis.