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. 09, 1993
Filed:
Jun. 12, 1991
Applicant:
Inventor:
Yasutoshi Komatsu, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ; G11B / ;
U.S. Cl.
CPC ...
333116 ; 333261 ; 360108 ;
Abstract
Reception and transmission of radio frequency signals is performed between the rotary portion and the stationary portion via an electromagnetically coupled portion in which a microstrip formed along substantial one lap of the circumference having a length equivalent to an odd multiple of substantially 1/2 of the electrical wave length of the transmitted radio frequency signal is electromagnetically coupled with a microstrip having a length equivalent to an add multiple of substantially 1/4 of the electrical wave length of the radio frequency signal.