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:
Mar. 08, 1994
Filed:
May. 08, 1992
Applicant:
Inventors:
Donald E Horne, San Jose, CA (US);
Prakash Kasiraj, San Jose, CA (US);
Fior D Sargent, San Jose, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G11B / ; G11B / ; G11C / ;
U.S. Cl.
CPC ...
324212 ; 365201 ; 369 55 ;
Abstract
At the wafer level, a conventional write signal is applied to a pre-selected thin film head. Thereafter, first and second constant amplitude, differing frequency sine wave signals are applied to the head along with a DC bias signal whose magnitude is varied. The level of frequency mixing in the output signal of the head is detected at each level of magnitude of the DC bias signal and this data is utilized in predicting the level of noise in the read-back signal of the thin film head during normal read and write operations in connection with a rotating storage disk.