National Printing Bureau, Incorporated Administrative Agency

Kazuhiko Shimada

Masato Kiuchi

Takao Yokote

Hisashi Okumura

Kazuo Itoh

In authenticity determinable printed matter according to this invention, a background image portion and at least one message image portion are printed on a surface of a base member. The background image portion has a first line drawing which is arrayed in a first direction and printed by an ink with a specular gloss to have an ink layer thickness. The message image portion has a second line drawing which is arrayed in a second direction and printed by the ink with the specular gloss to have the ink layer thickness.

Authenticatable printed matter and its production method

An authenticity discriminable printed matter in which a latent image cannot be visually identified under ordinary visible light but appears upon being irradiated with UV rays. A basic image is formed on a base material. The basic image is made of a latent image portion and latent image peripheral portion. The latent image portion and latent image peripheral portion cannot be visually discriminated, and each of them is formed from a set of dots continuously laid out at a predetermined period. The resolution of the dots of the latent image portion is different from that of the dots of the latent image peripheral portion. The latent image portion and latent image peripheral portion have the same percent dot area per unit area and different dot peripheral lengths (contour lengths) per unit area. The latent image portion and latent image peripheral portion are printed by color fluorescent ink, thus obtaining printed matter.

Growing community of inventors

Tokyo-to, Japan

Kazuhiko Shimada