| 摘要 |
The invention relates to a device comprising at least: (a) a sensor (5) of luminous energy from an external light source; (b) a transparent plate (1) arranged between said external light source and said sensor (5), comprising a first surface referred to as "front surface" (2) which is oriented towards said external light source and a second surface referred to as "rear surface" (6) which is oriented towards said sensor (5), said transparent plate (1) being optically structured on one of the two surfaces thereof (2&6) at least by a plurality of straight optical elements that are parallel to one another; (c) a plurality of image strips (3) separated by transparency strips (4); said device being characterised in that the longitudinal axis of the image strips (3) is tilted by an angle (a) other than zero relative to the longitudinal axis of the optical elements of the transparent plate (1), such that said images (3) viewed through the transparent plate (1) appear with a certain relief, while the energy production of the sensor (5) remains substantially constant regardless of the angle of incidence of said external light on the device. |
