| 摘要 |
<p>PURPOSE: To provide a concealed image wherein the first block and second block constituting the concealed image are hard to recognize by the naked eye and it is copied, both blocks can be recognized easily on copying paper with the naked eye. CONSTITUTION: Concealed image is comprised of a character part constituted of a large number of the first patterns 6 arranged, and a background part constituted of a large number of the second pattern 8 arranged. Then the first pattern 6 is constituted by connecting a plurality of the first constituent elements 7, in which the first recessed parts 7a are formed, with each other and the second pattern 8 is constituted by connecting a plurality of the second constituent elements 9, in which a plurality of the second recessed parts 9a are formed. In addition, the first recessed part 7a is formed in such a width that is reproduced under the original form condition at the time of copying, the second recessed part 9a is formed in such a width that is reproduced so that the original form can't be recognized at the time of the copying and the sum total of length of a segment of a line joining the outer circumference and inner circumference of the first and second constituent elements 7, 9 and the sum total of areas of the constituent element 7, 9 become idential respectively with each other.</p> |
