Method for Realizing Images that Can Be Viewed Selectively by Changing the Viewing Angle

Abstract

A method for realizing a first image and at least one second image in an etched area (6) under a lenticular grid (9) by laser etching with the aid of a tool (1), said first image and at least one second image It can be selectively visualized by changing the viewing angle. The tool includes a laser (2), a vibrating head (3), and a lens (4), and defines the optical axis (Z) and the working area (5). The method includes the following Step: placing the etching area (6) in a first position (7), which is included in the working area (5), on the periphery of the working area (5), and perpendicular to the optical axis (Z); etching first image; then placing the etched area (6) in a second position (8) different from the first position (7), said second position being included in the working area (5), in the working area (5) Peripheral, and perpendicular to the optical axis (Z); etch the second image.

Description

technical field [0001] The invention relates to a method of realizing at least two images selectively visible by varying the viewing angle. Background technique [0002] It is known to implement such images by interlacing them and placing the resulting interlaced result beneath a lenticular grid. This combination of interleaving and a suitable lenticular grid allows obtaining a device in which the first image is visible when the device is viewed along a first viewing angle and when the device is viewed along a different angle than the first viewing angle. At least one second image is visible when viewed at a second viewing angle. [0003] According to one class of methods, the interleaving is pre-realized, usually by printing, to be subsequently placed under the lenticular grid. [0004] According to another type of method, more particularly suitable for personalization, a laser-sensitive layer is arranged under a lenticular grid and the image is realized by laser etching ...

AI Technical Summary

Problems solved by technology

An important disadvantage is that the adjustment of the offset mirror depends on the position of the etched area relative to the device, and thus makes it difficult to change this position

Another disadvantage is that the distance traveled by the laser beam may vary depending on the positioning of the image and may result in variations in laser density

Furthermore, such methods do not allow for alignment to be achieved by the galvo head, which is especially required when realizing color images

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