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. 27, 1995
Filed:
Oct. 26, 1992
Kiyoshi Ohmori, Kanagawa, JP;
Tetsu Watanabe, Tokyo, JP;
Katsuhiro Seo, Tokyo, JP;
Junichi Kudo, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing. That is, the apparatus includes the disc rotating and driving unit which has a diameter of not more than 95 mm and in which the magneto-optical disc is housed and rotationally driven at a constant angular velocity, the optical head device for radiating a light beam to the magneto-optical disc, the external magnetic field generating unit arranged facing the optical head device with the magneto-optical disc in-between and adapted for applying a perpendicular magnetic field to the magneto-optical disc when recording information signals on the magneto-optical disc, the controlling device for controlling the disc rotating and driving unit, the optical head device and the external magnetic field generating unit and the outer casing having a width of not more than 101.6 mm, a depth of not more than 145 mm and a height of not more than 25.4 mm and adapted for accommodating the magneto-optical disc, the disc rotating and driving unit, the optical head device, the external magnetic field generating unit and the controlling device, for increasing the capacity for information signals and reducing the apparatus size.