mechanical svetelnu00e1 screen is tvorena telesem (1) from the light impermeable material in which is created. a collection of pruchozu00edch orifice (2) propouu0161teju00edcu00edch light.smerovost screens in a given direction is given by the pomerem smallest value length (i) opening (2) to the (c) is used svetlosti this orifice (2) selected from a set of all vytvorenu00fdch slot (2) forpouu0161teju00edcu00edch light in a given direction.efficacy of the orifice in the direction is given by the pomerem values souctu size areas of the opening (2) in a given direction to propouu0161teju00edcu00edch light is the size of the area (4) of bodies moving (1) impermeable to light in damy direction. the inner surface pruchozu00edch slot (2) is opatrena bezodrazovou surface layer.
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