Process for producing, by etching through a lenticular grating, images that may be selectively viewed by varying angle of observation
A lens-like and selective technology, applied in the direction of patterns, special patterns, temperature recording methods, etc., which are characterized by light projection effects, and can solve the problems of laser density variation, dependence, and difficulty in changing
Active Publication Date: 2019-03-01
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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
Method used
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[0035] as previously referenced figure 1 with figure 2 As described, the realization of the image according to the invention is obtained by laser etching. The laser beam 12 emitted by the laser 2 is deflected by the current measuring head 3 so as to scan the surface of the etched area 6 covering at least the entire surface of the image. The deflected laser beam 12 is corrected as it passes through the lens 4 . The etched area 6 is covered with a lenticular grid 9 . The laser beam 12 passes through the lenticular grid 9 in order to reach the sensitive layer present in the etched region 6 , which becomes black in proportion to the received laser power. This selective carbonization allows the direct production of gray scale monochrome images or indirectly through color matrix selective masks as described in FR11714352 or FR1103919 to produce color images.
[0036] In the case of multiple images that are selectively visible by changing the viewing angle, such etching through ...
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Process for producing, under a lenticular grating (9), in an etching zone (6), by laser etching, by means of a tool (1), a first image and at least one second image that may be selectively viewed by varying angle of observation, said tool comprising a laser (2), a galvanometric head (3) and a lens (4), and defining an optical axis (Z) and a working zone (5) and said process comprising the following steps: placing the etching zone (6) in a first location (7) included in the working zone (5) and on the periphery of the working zone (5), and, perpendicularly to the optical axis (Z), etching the first image; and then placing the etching zone (6) in a second location (8), which is different from the first location (7), included in the working zone (5) and on the periphery of the working zone (5), and, perpendicularly to the optical axis (Z), etching 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 ...
Claims
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IPC IPC(8): B42D25/41B41M5/26B41M3/14B42D25/324B44F1/10B41M5/34G02B30/27
CPCB41M3/148B41M5/26B44F1/10B42D25/41B42D25/324B41M5/24B44C1/228G02B30/27G02B30/10G02B30/26G02B30/00
Inventor C·万德鲁Y·莫雷尔B·贝尔特
Owner アイデミアフランス