| 摘要 |
<p>An authenticatable printed matter in which a latent image cannot be visually recognized under ordinary visible light but appears when irradiated with ultraviolet radiation. A basic image (2) composed of a latent image part (3) and a latent image periphery part (4) is formed on a substrate (1). The latent image part (3) and the latent image periphery part (4) are not visually distinguished, and are constituted of a group of dots arranged with constant periods. The resolution of the dots of the latent image part (3) is different from that of the latent image periphery part. The dot area percentages per unit area are equal to each other. The dot periphery lengths (contour lengths) per unit area are different from each other. The printed matter is produced by printing the latent image portion (3) and the latent image periphery (4) in color fluorescent ink.</p> |
