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:
Jan. 11, 1983
Filed:
Sep. 26, 1980
Applicant:
Inventors:
Akio Sakano, Tokyo, JP;
Kunio Shikakura, Tokyo, JP;
Hideshi Tamaru, Kanagawa, JP;
Kimiyoshi Yoshida, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R / ;
U.S. Cl.
CPC ...
369136 ; 369149 ;
Abstract
A pickup cartridge comprises a magnetic circuit having an air gap, a coil wound on the magnetic circuit and a cantilever having a permanent magnet inserted in to the air gap. In this case, the magnetic circuit comprises a delta-shaped jointless core having the air gap at its vertical angle, and the coil is inserted through the air gap and fixed to the core.