OPTICAL RECORDING MEDIUM HAVING TWO DEGREES OF REFLECTIVITY AND A DIFFRACTION GRATING OR HOLOGRAM FORMED INTEGRALLY THEREON
Patent №
US 5,138,604
Granted
1992-08-11
Filed 1989
Owner
DAI NIPPON INSATSU KABUSHIKI KAISHA
Lab
—
AI components
1
vision
Assignment
Recorded
Dataset
AIPD
2023_r1 edition
Application
07445638
An optical recording medium of the present invention has on a substrate information recording patterns (2) and (3) distinguishable by a difference in light reflectivity, and is characterized in that said information recording pattern (2) is comprised of a portion (2a) of high reflectivity and a portion (2b) of low reflectivity and at least a part of said information recording patterns is formed by a diffraction grating or hologram (3). Since such plural types of information can be formed at the same time and at high density, the present invention has a merit of its having excellent fake-proofness and its manufacturing process being simplified.
AI classification
Ownership
DAI NIPPON INSATSU KABUSHIKI KAISHA
assignment · 54140857
Assignors
UMEDA, KAZUO, KONDO, YUJI, ISHIKAWA, TOSHIHARU
On an employer assignment, the assignors are typically the inventors.