Disc driving motor and Information recording and reproducing apparatus

The invention provides a motor which is mainly used in an HDD, maintains high accuracy without runout even upon rotation at high speed, and is excellent in resistance to external forces. A disc driving motor of the invention includes: a base; a hub having a ring-shaped disc receiving face on which a...

Full description

Saved in:
Bibliographic Details
Main Authors OBATA SHIGEO, WAKITANI AKIHIKO
Format Patent
LanguageEnglish
Published 20.09.2007
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:The invention provides a motor which is mainly used in an HDD, maintains high accuracy without runout even upon rotation at high speed, and is excellent in resistance to external forces. A disc driving motor of the invention includes: a base; a hub having a ring-shaped disc receiving face on which a disc is placed; a hydrodynamic bearing rotatably supporting the hub; a motor unit mounted on the base, the motor unit having an outer diameter larger than that of the disc receiving face and giving a rotational force to the hub; and a magnetic shield plate provided on an axial clearance formed between the disc and the motor unit when the disc is placed on the disc receiving face. Herein, the magnetic shield plate is fixed while being inclined to the disc receiving face such that a pressure of an airflow in the axial clearance differs for each circumferential position upon rotation of the disc.
Bibliography:Application Number: US20060523659