Nhk Spring Co., Ltd.

Tsugutaka Sugahara

Hidekazu Hoshino

Itsuo Takeuchi

Masumi Yoda

Minoru Komiya

Hidemi Haga

A large number of magnetic polymer elements are distributed at random in a base material of a object to be checked. Each magnetic polymer element includes an element main body formed of a high-molecular material, such as an acrylic resin, and magnetic metal powder contained therein. The base material is formed mainly of paper, and the magnetic polymer elements are incorporated together with wood pulp fibers in the base material. The elements and the fibers are tangled with one another in three dimensions. Indication data including figures, symbols, etc., such as post position numbers and bet numbers on betting tickets for publicly-managed gambling, are printed on the object. The indication data, along with a proper output signal obtained in accordance with the state of distribution of the magnetic polymer elements, are enciphered according to specific rules for enciphering, and are recorded in a code indicator section by means of a recording medium, such as a magnetic stripe which is magnetically readable or a bar code which is optically readable.

Object to be checked for authenticity and a method for manufacturing the

Each identification mark consisting of hologram or diffraction grating having a unique diffractive property which can be detected with optical identification means is formed on a seal, and, by affixing such seals as a combination and reading them, the analysis or forgery of each identification mark is made highly difficult. Since the possible modes of combination and the possible number of combinations can be freely and easily selected, high levels of expandability, identification power and handling facility can be achieved at a relatively low cost. This system can be applied to various articles such as information storage cards including magnetic cards, and keys. By using the system for verifying the authenticity of the article, an effective prevention of the counterfeiting of the article can be achieved.

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Yokohama, Japan

Tsugutaka Sugahara