SU1720043A1 - Light flux scatterer - Google Patents

Abstract

The invention relates to fiber optics, in particular, to scattering devices. It can be used in illumination systems to improve the uniformity of the radiant flux density. The invention improves the dissipation properties of the device. The diffuser contains a packet of parallel-stacked fiber light guides, each of which has a light-guiding conductor in the form of a capillary, a transparent outer sheath and an inner scattering sheath. The refractive index of the outer shell is less than the refractive index of the lead wire, and the refractive index of the inner diffusing shell is also less than the core refractive index, but higher than the refractive index of the outer shell. 3 il.

Description

The invention relates to fiber optics and can be used in lighting systems to improve the uniformity of the density of the scattered radiant flux.

The purpose of the invention is to increase the uniformity of the scattering of the radiant flux.

FIG. 1 shows a diffuser of radiant flux; in fig. 2 - the passage of oblique rays through the fiber; in fig. 3 - passing through the fiber meridional rays.

The radiant flux diffuser contains a housing (not shown), inside which is placed a package 1 of optical fibers, each of which has a light guide conductor in the form of a capillary 2, an outer sheath 3 and an inner sheath 4 of a scattering material, the refractive index ng of which satisfies the condition

Mon Pb

where mon is the refractive index of the outer shell 3;

pc is the refractive index of the capillary 2.

The diffuser of the radiant flux works as follows.

The radiant flux 5, directed to the input end 6 under the aperture angle a, is converted inside the diffuser into a stream that complements the missing directions of the rays within the entire calculated aperture a0, and leaves the output end 7 within the angle 2a. Independently from the input angle aperture a. This is because oblique rays, such as a bundle of rays 8, travel through the optical fiber along a helical line, not entering the inner envelope 4, but meridional rays, such as beam 9, when passing through the optical fiber hit the diffusing inner envelope 4, are scattered in it and form the rays of others

V4 S O O CO

directions (rays 10,11 and others.). The implementation of the inner shell 4 of the directionally-scattering allows to significantly reduce the formation of out-of-alert rays 11, i.e., to reduce the energy output through the side surfaces of the optical fibers.

The use of the invention makes it possible to improve the uniformity of the scattered radiant flux in the cross section at the exit of the diffuser in illuminators of primary directional radiation.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A luminous diffuser comprising a housing inside of which A package of optical fibers including a corresponding core and outer shell, characterized in that, in order to increase the uniformity of scattering, in it the light guide core is made in the form of a capillary with an inner shell made of. scattering material whose refractive index ng satisfies the condition: , where Mon is the refractive index of the outer shell; Pk is the refractive index of the capillary. fJTfSSf J / S  / Hh . . .... h ........., .- ..J., -... .. .... "" "..h. J Tif-1 f v fjL Mt g - G .-   h h four /// ///./// ///////// /; - i t Tt1 -1.- g-- - f Γ - t.jA -j f jjCf 7 --TF-. .-g.,. J | /..L.y.j .LJ.y- Т  / ////// /// s / s /// 4} // # -. . ..-: h ff y -ili- «- .Т And at У1У 4- .J д f -1 t .т j i.- Ь. j j j1 GA “r- -gT V: -r v j jfii - h.p.t - rf-jiL .C-rJiJr - -T J- f .Z -TZjjiji   Ss Have ,   4t /// J # fJTfSSf J / S  . s1   . one- .-. r; l FIG. one  2 W-. LU .. Lg H. H // KCh H / 2V / Sf / Sf / L h g. W fig.Z