Title:
【発明の名称】情報を含有する複合層
Document Type and Number:
Japanese Patent JP2927435
Kind Code:
B2
Abstract:
PURPOSE:To so record information as to be impossible or difficult to be visually recognized by providing one specific wavelength range having 30% or more of difference of spectral reflectivity in a near infrared ray range, and providing two layers which are impossible or difficult to visually recognize it. CONSTITUTION:The first and second reflecting layers 1 and 2 of an information recording sheet both have one specific wavelength range having 30% or more of difference of spectral reflectivity in a near infrared ray range of 700-2,500nm in such a manner that the reflectivity of the first layer 1 is larger than that of the second layer 2. The first and second layers 1 and 2 are both impossible or difficult to be visually recognized, and can be identified only by utilizing a near infrared ray detecting system. In order to be difficult to visually recognize the first layer 1 from the second layer 2, they are formed to be achromatically, and an arbitrary pattern shape such as a character, a graphic, a bar code, etc., is, for example, formed on the layer 2.
Inventors:
TANAKA SATORU
IKEDA MAMORU
OONISHI YASUAKI
IKEDA MAMORU
OONISHI YASUAKI
Application Number:
JP29951988A
Publication Date:
July 28, 1999
Filing Date:
November 29, 1988
Export Citation:
Assignee:
NIPPON KAABAIDO KOGYO KK
International Classes:
B41M3/14; B32B7/02; B41M5/26; B42D15/10; G11B7/24003; G11B7/24035; G11B7/244; (IPC1-7): B41M3/14; B32B7/02; B42D15/10
Domestic Patent References:
| JP58134782A |