| 摘要 |
<p>PURPOSE:To clearly discriminate the difference of copy and duplicate of a certificate identification card by mounting a precisely etched transparent glass plate in a camera to copy the pattern on an image surface to form the card. CONSTITUTION:A transparent glass plate 17 is formed with a precise and fine pattern, and ink is filled in a fine groove 17a. The density and color of the ink are determined by discovering optimum conditions by considering design pattern disposing position on the image forming surface of an ID card to be applied so as to clearly distinguish it. The plate 17 having the design pattern composed of the groove 17a is mounted on the focused surface of the camera, and a human image A, a data image B and the design pattern 3 are simultaneously formed on a photosensitive emulsion layer 1b of a photographic sensitive material 1. Thus, even if a duplicate card is formed by copying, etc., the pattern 3a is not reproduced. If it is inspected by an optical Lupe, the unclear fine pattern can be easily determined to be nonsimilar.</p> |
