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:
May. 25, 2010
Filed:
Oct. 10, 2008
Ke-cai Zeng, Fremont, CA (US);
Steven Sanders, Los Altos, CA (US);
Yansun Xu, Mountain View, CA (US);
Ke-Cai Zeng, Fremont, CA (US);
Steven Sanders, Los Altos, CA (US);
Yansun Xu, Mountain View, CA (US);
Cypress Semiconductor Corporation, San Jose, CA (US);
Abstract
A system and method are provided for screening a semiconductor laser. The method includes: (i) operating the laser at a first of a number of drive currents; (ii) acquiring a number (N) of frames of data from a sensor in an optical navigation system (ONS) receiving speckle pattern in light from the laser reflected from a surface proximal to the ONS, the sensor data including differential signal values; (iii) calculating an average differential signal value (AVG) for the N frames of data; (iv) sorting the N frames of data across a plurality of bins including a Bin_0 for frames of data having a differential signal value within a predetermined amount of the AVG; and (v) determining if a number of frames of data in any bins other than Bin_0 exceed a predetermined threshold, and if so recording the drive current.