RU2543528C2 - Optical system for secondary light-emitting diode optics - Google Patents

Abstract

FIELD: physics, optics.

SUBSTANCE: invention relates to light engineering, particularly to secondary optics of light-emitting diode (LED) lamps, used primarily for lighting streets, parks, areas surrounding buildings and for lighting large facilities, such as warehouses or stores. Lenses are made in the form of a truncated cone; the exit surface of the lenses is flat, with a cross-section which varies on the height of the cone from a circle at the vertex and to an ellipse at the base. Each lens has at its base a recess in the form of a truncated cone in which both bases are in the form of a circle; the larger base of said recess matches the circular base of the lens. The lens can be in the form of truncated right cone. The recess can also be in the form of truncated right cone.

EFFECT: generating the required light intensity curve, reducing optical losses, reducing contamination of the surface of the lamp, easier maintenance and simple design of the secondary optics of the lamp, achieved due to that the optical system for secondary LED optics, having an array of lenses attached to a LED panel, further includes a flat protective panel on which a lens array is mounted.

3 cl, 5 dwg

Description

The invention relates to lighting equipment, and in particular to the secondary optics of LED lamps, used mainly for outdoor lighting of streets, parks, adjoining territories and for lighting large indoor premises such as warehouses or shops.

One of the problems with optics for road luminaires is that it (optics) needs to be protected from pollution. But the angles of disclosure of the light intensity curve (LSS) are so large that it is required to produce a protective window with a curved shape. With a flat exit window, the light has large Fresnel losses for passing through it, since the angles of incidence exceed 50 degrees.

Closest to the proposed invention is an optical system for a LED lamp, containing a matrix of conical lenses attached to the LED panel (see RU 2011100844 A, publ. 20.07.2012). A disadvantage of the known optical system is the impossibility of generating the required light intensity curve (KSS) for LED panels of certain designs, as well as the exit surface of the lens kit, which is complex with many bulges, and, accordingly, the protective panel, which introduces additional losses, is difficult to manufacture, and traps dust and dirt and difficult to clean.

Contamination is due to dust retention in the unevenness of the output surface of the protective panel. The difficulty of maintenance arises due to the roughness of the output surface and the inaccessibility of some of its part for cleaning products. The complexity of the design is associated with the complex, with many bulges, shape of the output surface of the protective panel. The complexity of the QSS formation is associated with the complex, non-planar structure of the output surface and the complexity of matching the beams from individual convexities of the surface. Additional losses are associated with Fresnel reflections.

The technical result of the present invention is to obtain KSS type "Sh" for a certain type of LED lamps, to obtain KSS of other types for different types of LED lamps, as well as to reduce losses, contamination of the surface of the lamp, facilitate maintenance and simplify the design of the secondary optics of the lamp.

The technical result is achieved due to the optical system of secondary LED optics containing a matrix of conical lenses attached to the LED panel.

According to the invention, the optical system further comprises a flat protective panel on which an array of lenses is attached, wherein the lenses are made in the form of a truncated cone, the output surface of the lenses is flat, with a cross section varying in height from the circle of the cone at the apex to the ellipse at the base and each lens in its base has a recess in the form of a truncated cone, in which both bases are made in the form of a circle, the larger base of the cone-recess coincides with the round base of the lens.

According to the invention, the lens and the recess are a straight truncated cone.

The invention is illustrated by drawings, in which:

figure 1 presents the lens of secondary LED optics, known from the prior art;

figure 2 presents the optical system of secondary LED optics with ten lenses and a protective panel;

figure 3 presents the characteristic optical rays of the LED source and their conversion in the body of the lens;

figure 4 presents the pattern of light distribution;

figure 5 presents a graph of the angular distribution of light intensity (light intensity curve).

The lens is a truncated straight cone. In the case when it is required to obtain a “W” type luminous intensity curve, the large base of the cone has the shape of an ellipse, and the small base is a circle. In the upper part of the cone (in a small base), a recess is also made in the form of a truncated cone. The large base of the notch cone is the round base of the lens cone. And the small base of the cone-notch is also a circle. The notch cone is also a truncated straight cone. By changing the shape of the cross section of the base of the lens cone, you can change the shape of the light intensity curve. Since the exit surface of the lenses is flat, the protective panel to which the lenses are attached also has a flat shape.

By changing the shape of the lenses and certain geometric proportions (for example, the distance between the lenses, etc.), the light intensity curve required for a given lamp is achieved. With a flat shape of the output surface of the protective panel, all irregularities disappear, that is, places where dirt can accumulate disappear. The flat shape of the output surface of the protective panel does not distort the light beam from the array of lenses, which in turn facilitates the formation of the light intensity curve and reduces “light pollution”, that is, the loss of radiation coming out of the region bounded by the required light intensity curve. The flat surfaces of both the lenses and the protective panel facilitate the manufacture of this optical system as a whole.

The lens is made of any transparent optical material. On the narrow side, an LED radiation source is installed.

Figure 3 schematically shows the characteristic optical rays of the LED source and their conversion in the body of the lens. The sections of the lens in two mutually perpendicular planes are considered.

After optimizing the geometric parameters, such a system allows you to create uniform illumination of rectangular surfaces, which is required for lighting devices operating in the field of road lighting (examples of the distribution pattern and the graph of the angular distribution of light intensity are shown in Figs. 4 and 5, respectively).

Claims (3)

1. The optical system of the secondary LED optics for forming the luminous flux of the LED street lamp, comprising a matrix of lenses attached to the LED panel, characterized in that it further comprises a flat protective panel on which the lens array is attached, the lenses being made in the form of a truncated cone, the output surface of the lenses is flat, with a cross section varying in height of the cone from the circle at the apex to the ellipse at the base, and each lens has a recess in its base yoke truncated cone in which both the base are made in the form of a circle, a cone, the larger base of the recess coincides with a circular base lenses. 2. The system according to claim 1, characterized in that the lens is a straight truncated cone. 3. The system according to claim 1, characterized in that the recess is a straight truncated cone.

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