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:
Jan. 08, 1991
Filed:
Nov. 17, 1987
Applicant:
Inventor:
Akihiko Hashimoto, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06R / ;
U.S. Cl.
CPC ...
235488 ; 235385 ; 235457 ; 235487 ;
Abstract
In an optical card having a card substrate on which binary data are recorded by a portion having high reflectivity and a portion having low reflectivity, a background portion is formed by a material having low reflectivity. Therefore, even if a positional relation between a light receiving region of a light receiving element and a bit portion is varied, the data can be accurately read out. Further, since the background portion can be formed by the printing method or the photo developing method and can be used for the other of binary data, the optical card can be manufactured in an inexpensive manner without generating a skew.