F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
240/134
F21V 1/00 (2006.01)
Patent
CA 1058593
A p p 1 i c a t i o n by Jann Petersen LAMP-SHADE FOR TUBULAR LAMPS ABSTRACT OF THE DISCLOSURE A lamp-shade for tubular lamps of outer diameter d, comprising two longitudinally extending, in cross sections evenly concavely curved, light reflecting side shade-faces facing each other and arranged on each side of a middle plane containing the axis of the lamp. The shade further comprising a number of light reflecting cross plated extending between the two side shade-faces evenly spaced along the length of the shade. The distance between the lamp and a plane through the lower edges of the side shade faces being between 1.7 d and 3 d. Each side shade-face being evenly curved from an uppermost portion situated at a level higher than that of the upper side of the lamp and having a minimum distance from said middle plane not exceeding 6 d to the lower edge and is near the latter touching a plane parallel to the middel plane in a distance therefrom of between 1.3 d and 3 d. The lower border d and is slightly converging towards said middle plane. - 1 -
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