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:
Apr. 07, 1998
Filed:
Mar. 05, 1996
Applicant:
Inventors:
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11C / ;
U.S. Cl.
CPC ...
369 14 ; 365114 ;
Abstract
An ultraviolet laser beam emitted from a laser beam source 1 is subjected to on/off control at an AOM 3, is linearly scanned at an equal speed by a polygon mirror 5 and an f.THETA. lens 6, is collected by an object lens 7, and is selectively spot-irradiated to a memory cell array of a semiconductor chip 8 on an XY stage 9 two-dimensionally moved by a control device 10 so as to write a pattern corresponding to desired data, whereby a custom ROM can be supplied in flexible production on a timely basis meeting market trends.