| 摘要 |
FIELD: optics. ^ SUBSTANCE: device has cover covering upper and side portions of optical devices block with vertical flat-parallel screens rigidly mounted on its inner surface perpendicularly to optical devices emission axis, with apertures for passage of optical radiation, contour of which repeats contour of cover. Vertical parallel screens are made of different height and mounted in such a way, that plane, passing through their bases, forms sharp angle alpha with plane, perpendicular to emission axis of optical devices. In lower portion of vertical parallel screens outside zone of passage of optical radiation vertical parallel plates are mounted, such, that in conjunction they form aerodynamic breaking block in form of volumetric grate with mutually perpendicular cells sides. ^ EFFECT: higher efficiency, higher durability. ^ 2 cl, 6 dwg
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