light for the device known from the prior art 14 continuous line and for the device that is the subject of the invention 15 dotted line interest is focused on the variation of the electrical production as a function of the angle of incidence u03b2 which is why the production values are normed it can then be observed that the electrical production varies up to close to 80 in relation to the peak to peak average value for the device 14 the minimum and maximum productions alternating approximately every 30 u00b0 the minimum production corresponds to the illumination by the light source 16 of all of the image strips 3 a configuration in which the photovoltaic sensor 5 receives only a small quantity of light and therefore produces little for its part the maximum production corresponds to the illumination of a multitude of zones of the photovoltaic sensor 5 through the transparency strips 4 said sensor 5 consequently receiving a strong light intensity by comparison the device 15 exhibits a small variation of the energy production which does not exceed 12 in relation to the average value between the maximum production and the minimum production in the device that is the subject of the invention 15 the electrical production is therefore substantially constant as a function of the angle of incidence u03b2 and of the external light 16 the result of the above is that the invention achieves the aims set it describes a device having optical characteristics to give the illusion of relief to an image placed on the surface of a light energy sensor without presenting the drawbacks of the hitherto known devices the device that is the subject of the invention will make it possible to improve the visual integration.