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:
Jun. 25, 1985
Filed:
Jun. 02, 1982
Applicant:
Inventors:
Hideki Hatano, Tokorozawa, JP;
Norikiyo Tajiri, Tokorozawa, JP;
Sakashi Otaki, Tokorozawa, JP;
Shigeru Kato, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 45 ;
Abstract
Disclosed is an information recording system having a recording light beam passing through a focus lens, and a focus servo mechanism for adjusting the position of the focus lens, characterized by the provision of a bias beam of a weak intensity for producing a continuous control signal for the focus servo mechanism.