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:
Jul. 04, 1989
Filed:
Jun. 18, 1987
Sony Corporation, Tokyo, JP;
Abstract
Apparatus for recording and reproducing information in record tracks on a rotatable record disc comprises a disc driving portion for rotating the rotatable record disc about an axis of rotation, a pair of optical heads each facing the rotatable record disc and respectively positioned on opposite sides of the axis of rotation, and a head driving portion for moving the optical heads simultaneously towards or away from each other in a radial direction on the rotatable record disc. Each optical head generates a first light beam used selectively for erasing and writing an information signal in the record track and a second light beam used for reading an information signal from the record track and causes the first and second light beams to impinge upon the record track on the rotatable record disc in such a manner that the first light beam precedes the second light beam in a direction along the record track.