| 摘要 |
<p>1. A method for the manufacture of a microlamellar optical filter constituting a directional filter of the type comprising a transparent plate (3) which bears at least one network of opaque microblades (2a-2n; 20a-20m; 21a-21n) arranged in in such a manner that the observation via light transmission through the filter is reduced to a field of inspection delimited by the mutual distance (L) of the microblades and their height (H) along the transmission direction, characterized by the following steps : - coating of a photosensitive thick layer (1) on one of the large surfaces of said transparent plate (3), and - holographic recording of a light point in said layer (1) according to the thick holography technique by transmission in such a way that a thick amplitude hologram by transmission is built, constituting at least one network of opaque strati extending over a height (H) corresponding to the thickness of the layer and having mutual spacings (L) which are substantially larger than the wave lenghts of the visible spectrum, said opaque strati constituting said microblades (2a-2n; 20a-20m; 21a-21n).</p> |
