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:
Oct. 04, 2016
Filed:
Oct. 12, 2015
Headway Technologies, Inc., Milpitas, CA (US);
Matteo Staffaroni, San Ramoni, CA (US);
Xuhui Jin, San Jose, CA (US);
Weihao Xu, San Jose, CA (US);
Jianing Zhou, Fremont, CA (US);
Ya-An Yang, Fremont, CA (US);
Dayu Zhou, Fremont, CA (US);
Headway Technologies, Inc., Milpitas, CA (US);
Abstract
A thermally assisted magnetic recording head is disclosed having a spot size converter with at least one secondary waveguide adjoining a top or bottom surface of a primary waveguide. Each waveguide has tapered sides but the secondary waveguide is tapered at a greater angle over a shorter taper distance in order to couple propagated light into the primary waveguide before the front end of the taper. The secondary waveguide terminates in a ridge with a fixed width wof about 50-170 nm that is between the front end of the taper and the air bearing surface (ABS). The ridge enables transverse magnetic (TM) transmission mode efficiency above 90% even with a typical process misalignment in the cross-track and height directions. The primary waveguide has a front section with width wbetween an end of its tapered sides and the ABS where wis substantially larger than w