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. 31, 1998
Filed:
Dec. 18, 1995
Applicant:
Inventor:
Keum-Mo Kim, Seoul, KR;
Assignee:
Daewoo Electronics Co., Ltd., Seoul, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360107 ; 360 84 ;
Abstract
A head drum assembly for use in a VCR includes a rotating shaft with a diamond-like carbon ('DLC') coating; a rotary drum fitted tightly around the rotating shaft; a stationary drum, fitting around the rotating shaft, and incorporating a set of DLC coated bearing surfaces; and an axial thrust bearing means. Such a head drum assembly allows smooth rotation by using herring-bone shaped grooves or protrusions in conjunction with DLC coatings in the appropriate bearing surfaces.