RU2674263C1 - Led illuminator - Google Patents

Abstract

FIELD: lighting engineering.SUBSTANCE: invention relates to the field of lighting, in particular to LED illuminators that perform functions of both lighting and signaling, in particular for illuminating the area of space observed by a television camera. Technical result is achieved due to the fact that LED sources in the amount of not less than two, each of which has an immersion lens, concentrating the radiation in solid angle α, arranged in several lines parallel to each other, and placed at the vertex of the corresponding focon line, each with two mirrored surfaces, limiting radiation with an angle β, determined by the ratio of tg(α/2):tg(β/2)=16:9 or tg(α/2):tg(β/2)=4:3, and the protective cap-lens is made flat.EFFECT: technical result is the formation of a close to a rectangular light spot of the illuminator corresponding to the image format of a television camera, namely 16:9 or 4:3.1 cl, 4 dwg

Description

The invention relates to lighting equipment, namely to LED illuminators (lamps, searchlights) with symmetrical light distribution used to illuminate the area of space and objects observed by a television camera.

The image format of the television camera is standardized and is 16: 9 or 4: 3. Therefore, in order to reduce energy losses for lighting, it is necessary to form the luminous flux of the illuminator not in the form of a cone with a round spot of light, but in the form of a pyramid with a rectangular light spot with an aspect ratio of 16: 9 or 4: 3.

Known "Lighting device with an asymmetric distribution of the light flux relative to the optical axis" described in patent RU 2137978 (publ. 09/20/1999). The luminous flux in the specified device is formed as follows: first, the radiation passes through the lenses - capacitors, then the lens raster - the diffuser, and then the two optical surfaces of the lens sections of the external diffuser with mutually perpendicular optical axes. The result is an uneven distribution of light in the vertical plane.

Also known is “Light beam shaper”, patent RU 2456503, (published May 10, 2011), intended to give an elongated shape to a light beam. The device comprises a lens having an axis, an input diopter (surface) and an output diopter (surface). The output diopter comprises a first collecting section, a second collecting section and a scattering section connecting said first and second collecting sections. The output diopter contains an axisymmetric continuous surface, made around the axis of rotation, perpendicular to the axis.

The disadvantage of both of the above known devices is that they do not form a symmetric distribution of the light flux with a light spot of the required shape.

Closest to the claimed device is "Lighting device", patent RU 2499184 (publ. November 20, 2013). The known device comprises a housing with power and connection elements placed therein, LED light sources mounted on a heat-conducting base installed in thermal contact with the housing, and a protective cap lens. The protective lens cap is made in the form of a paraboloid of revolution with a depressed apex, the outer and inner surfaces of which are formed by the rotation of a part of the parabola that is cut off by a straight line parallel to the axis of the parabola and spaced A apart from it, the said straight line being the axis of rotation.

The disadvantage of the prototype is that the known device also does not form a symmetric distribution of the light flux of the required shape, and in addition, the protective cap lens is difficult to manufacture (especially from hard and brittle materials).

The problem to which the invention is directed, is the creation of an LED illuminator with a light flux having a rectangular spot shape of a light spot.

The technical result is the formation of a near-rectangular shape of a spot of emitted light corresponding to the image format of a television camera, namely 16: 9 or 4: 3.

Any other format of the light flux (light spot), for example, round, leads to a decrease in the quality of the television image and excessive energy consumption.

This is achieved by the fact that the LED illuminator, consisting of a housing with power and connection elements placed in it, LED sources and a protective lens cap, is characterized in that at least two LED sources, each of which has an immersion lens concentrating radiation in the solid angle α, are arranged in several lines parallel to each other, and placed at the top of the focon corresponding to each line, which has two mirror surfaces restricting the radiation to angle β, by the relation tg (α / 2): tg (β / 2) = 16: 9 or tg (α / 2): tg (β / 2) = 4: 3, and a lens-cap is flat.

The essence of the invention is illustrated by graphic materials, where:

in FIG. 1 shows a section AA of the inventive illuminator;

in FIG. 2 - front view of the illuminator;

in FIG. 3 - radiation diagrams of the illuminator;

in FIG. 4 - format of the light spot of the illuminator.

The LED illuminator (see Fig. 1, 2) consists of a housing 1, in which power elements 2, a connection element 3, LED sources 4, a protective lens cap 5, immersion lenses 6 and one of the foci 7 with two mirror surfaces are installed. The section plane (AA) is perpendicular to the lines of the lines of the light emitting LED sources 4, each of which may consist of a single LED crystal or several crystals.

In FIG. 2 shows a front view of the relative position of the housing 1, the LED sources 4, the lens cap 5, the immersion lens 6 and the focons 7 with mirror surfaces.

The LED illuminator generates a symmetrical luminous flux forming a light spot with a shape close to rectangular and an aspect ratio of 16: 9 (or 4: 3), as follows.

Through the connecting element 3, an external supply voltage is supplied to the power elements 2, converting and stabilizing the current for LED sources 4.

Each of the LED sources 4 is equipped with an immersion lens 6, concentrating radiation in the angle α.

If you constructively change the distance between the emitting surface of the LED crystal and the focus of the immersion lens 6, you can get a different solid angle of radiation α. In practice, it can range from 30 ° to 110 °.

Thus, it is possible to form the necessary width of the light spot along one axis, for example, from left to right. This orientation of the light spot is justified, since the image formed by the television camera also has top, bottom, left and right.

In order to form the size of the light spot along the other axis (top - bottom), the LED sources 4 must be at least two in each row and they must be located at the vertices of the corresponding foci 7 with two mirror surfaces. These surfaces limit the luminous flux emitted in angle α to angle β. Moreover, the angle α, as a rule, is chosen equal to or greater than the maximum angle of the field of view of the television camera. To determine the angle β with accuracy sufficient for practice, one should use the ratio tg (α / 2): tg (β / 2) = 16: 9, or tg (α / 2): tg (β / 2) = 4: 3.

An increase in the number of LED sources in a row of more than 2 does not affect the shape of the radiation pattern. Since these sources do not emit coherent, but diffuse light, their light fluxes add up in space, at a distance of more than 10 line lengths, the illuminator can be considered a point source. The maximum allowable number of LED sources per line and the number of lines in the illuminator is determined by its required power and the convenience of their power and control.

In FIG. Figure 3 shows the solid angles of radiation (diagrams) of the LED illuminator in the required format in Cartesian coordinates. The optical axis of the illuminator radiation is perpendicular to its frontal projection.

In FIG. 4 shows the shape of the light spot of the illuminator and the dotted line shows the image format of a television camera with an aspect ratio of 16: 9.

A significant advantage of the inventive illuminator is the flat shape of the lens cap. This is especially important for high-pressure illuminators, which requires the use of hard-to-handle non-cast materials, such as tempered glass or leucosapphire. The flat shape of the lens cap is also preferable for the design of illuminators at ultraviolet wavelengths, or in the infrared range, when the use of polycarbonates and other organic materials is impossible.

Since neither case 1, nor power and connection elements 2, 3 affect the achieved result, they are made solely on the basis of the operating conditions of the illuminator, the efficiency of heat removal from the LED sources 4, and the efficiency of heat exchange of the case 1 with the external environment. Designed, manufactured and tested prototype showed the feasibility and compliance of the parameters with the declared result.

JSC “Research Institute of Television”

Gultyaev Yuri Pavlovich, St. Petersburg, ul. Gribaleva, d. 8, apt. 48, 194100

Klyukin Alexander Valerievich, Leningrad Region, Nikolskoye, st. Pervomaiskaya, d. 17, bldg. 2, apt. 804, 187026

Kovalchuk Victor Sergeevich, St. Petersburg, ul. 2nd Sovetskaya, d. 14/4, apt. 2, 191036

Written Evgeny Vladimirovich, St. Petersburg, ul. Baikonurskaya, d. 19, building. 1, apt. 3, 197202

Claims (1)

LED illuminator, consisting of a housing with power and connection elements placed in it, LED sources (modules, LEDs) radiating in solid angle α, and a protective lens cap, characterized in that at least two LED sources are arranged in several rows parallel to each other, and placed at the top of the focon corresponding to each row, having two mirror surfaces restricting the emission of LED sources to an angle β determined by the ratio tg (α / 2): tg (β / 2) = 16: 9 or tg (α / 2 ): tg (β / 2) = 4: 3, and the protective lens cap is flat.

Images