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:
Feb. 16, 1988
Filed:
Mar. 24, 1986
Applicant:
Inventors:
Assignee:
Polygram International Holding B.V., Baarn, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; B44C / ; C03C / ;
U.S. Cl.
CPC ...
369280 ; 156643 ; 156645 ; 156654 ; 1566591 ; 156663 ; 2191 / ; 264-11 ; 264220 ; 428156 ;
Abstract
The invention relates to disc-shaped information carriers which can be read optically in reflection and which contain an annular information zone which is bounded by a concentric inner zone and a concentric outer zone. The information carrier consists of a transparent substrate and has a readout side and an opposite side (back) which at least in the information zone has a reflective coating. The light entering the outer zone from the readout side is reflected at least partially diffusely or absorbed by the information carrier. In this way, manufacturing defects such as, for example, inclusions, inhomogeneities etc. are at least partially masked or concealed.