RU2235942C2 - Dome light exploiting light-emitting diodes - Google Patents

Abstract

FIELD: illumination engineering.

SUBSTANCE: light has a circuit provided with light-emitting diodes covered with a transparent baffle, outer frame grid, and reflector. The reflector is provided with diaphragm holes for light, illumination of the reflector and transparent baffle. The plane passing through the axial line of the beam of each light-emitting diodes and line which connects the center of the reflector with the light body of the diode is inclined to the plane of the housing at an angle from -

/2 to +

/2. The light-emitting diodes are arranged over the periphery of the housing uniformly.

EFFECT: enhanced efficiency.

6 cl, 7 dwg

Description

The present invention relates to lighting equipment and, in particular, to devices used to illuminate small rooms, cabs and armored vehicles.

Known lighting device designed to illuminate the interior of vehicles with the aim of increasing the uniformity of illumination and reducing brightness. It consisted of a paraboloid reflector located on the smaller side of the rectangular casing, a light source installed in the focus of the reflector, a hollow fiber with a diffuse reflective surface, as well as a reflective end at the end of the fiber and a diffuser with prismatic refractors. The optical axis of the light source was tilted at an acute angle to the surfaces of the instrument housing and the prismatic refractor. Partially, the light exited immediately through the refractor, and the other part came out after several reflections from the walls of the fiber [1].

In a portable pulse signal device with one LED [2] in a rectangular case, covered by a flat prismatic lens with a matte outer surface, the optical axis of the LED was tilted relative to the diffuse reflecting plate and the flat prismatic lens (parallel to the plate) located at the bottom of the angle 3 -22 °.

The disadvantages of the described devices are associated with the uneven brightness of the light spot created by such structures. The brightness is always lower at the end of the device farthest from the LED. In addition, the illumination in the transverse direction is always less than in the longitudinal. In addition, such a device has reduced light efficiency, since the LED or lamp obscures part of the reflector surface, and the brightness of one LED is small.

The prototype of the proposed technical solution is the cell signal device [3]. It consisted of two LEDs placed at the ends of a rectangular cell body. LEDs were mounted on a panel located at the bottom of the housing, which has a reflective coating. The inclination angle of the optical axis line of the LED was 10-45 ° with the plane of the bottom of the housing and the reflective coating. The radiation was directed outward through the outlet of the cell, blocked by a protective transparent plate, or by various lens elements.

The disadvantages of the prototype are the same. In the transverse direction relative to the line connecting the LEDs, the brightness of the emitter is less than in the longitudinal. The light efficiency of the device is reduced, as the LEDs and their fasteners obscure part of the reflector.

The aim of the invention is the elimination of these disadvantages and the creation of a lighting lamp with LEDs with more uniform light distribution and increased efficiency.

This goal is achieved by the fact that in the lighting dome on the LEDs containing a housing made of durable material with an electric current transducer placed in it, a mounting plate with LEDs, the optical axial lines of the radiation beams of which are inclined at an angle to the planes of the housing and the reflector inserted into it, whose output the hole is blocked by a transparent partition and a protective frame grill external above it, the reflector is equipped with diaphragmed holes for the passage of LED radiation, irradiated I of the surfaces of the reflector and the transparent partition, and the plane passing through the axial line of the beam of each LED and the line connecting the center of the reflector with the body of the LED light is inclined to the plane of the body at an angle α, selected within the range -π / 2≤α≤ + π / 2 .

The goal is achieved by the fact that the LEDs are evenly spaced around the circumference of the case, the axial lines of their beams are directed to the points lying on the inner surface of the lampshade at equal distances from two adjacent diaphragmed holes, and the number of LEDs is selected from the condition that the sum of the diameters of the spot spots on the inner surface of the lampshade not less than the length of its circumference.

The achievement of this goal is also facilitated by the fact that the LEDs are mounted inside the lampshade next to each other with an angle of 2 ° between the horizontal direction of the optical axial lines of their beams equal to the full angle of divergence of the beam, and their number n is π / 2Θ.

The technical result is also achieved by the fact that a prismatic diffuser is used as a transparent partition blocking the outlet of the reflector, and the optical axial lines of the LED beams are mounted vertically relative to the plane of the housing.

The result is also facilitated by the fact that the LEDs are installed horizontally at the ends of the rectangular case with the direction of the optical axial lines of the beams towards each other along the greater side of the case between the reflector and diffuser, which function as the walls of the fiber.

The goal is also achieved by the fact that the protective frame mesh on the inside is provided with a reflective coating.

A useful result is obtained when LEDs are used that emit in various ranges of the visible region of the spectrum, for example, in the range of 380-520 nm.

The most preferred embodiments of the device according to the invention are shown in the drawings.

Figure 1. A variant of the optical scheme of the lighting lamp with a uniform arrangement of LEDs around the circumference of the reflector.

Figure 2. A variant of the optical design of the lighting lamp with a uniform arrangement of LEDs around the circumference of the reflector, the optical axial lines of which are directed to the opposite side of the reflector in the gap between two adjacent diaphragmed holes.

Figure 3. A variant of the optical design of the lighting lamp with a compact arrangement of LEDs on one side of the reflector.

Figure 4. Cross section of one design variant of a lighting lamp with diffuser.

Figure 5. A longitudinal section of a design variant of a rectangular lighting shade.

6. Cross section of a design variant of a lighting shade with a domed glass diffuser.

7. Top view of a part of the design of the lighting shade, shown in Fig.6.

The optical scheme of the lighting dome shown in Fig. 1 consisted of uniformly located LEDs 1-4 along the outer boundary of the reflector 5. The plane 6 passed through the axial line of the optical beam and the line connecting the center of the reflector with the body of the LED light. The angle of inclination of the plane 6 to the plane of the reflector 5 is indicated by α. The LEDs are placed on the outside of the reflector 5. Their radiation passed through the diaphragmed holes (shown by arrows in Fig. 1) 7, 8, 9, and 10, made in the reflector 5. Holes 7-10 were diaphragmed, because they can be round, elliptical, or any a different shape and different sizes, allowing you to form a beam (i.e., the curve of the light intensity of the LED), shielding the lateral rays.

Figure 2 shows a variant of the optical scheme of the lighting lamp, in which the optical axial lines of the LED beams are directed to the points lying on the surface of the reflector, dome or flat diffusers, at equal distances from two adjacent diaphragmed holes. The LEDs 1-4 themselves are located between the reflector and the housing 11 of the lampshade. The divergence angles of the LED beams are indicated by 2Θ, and the points lying at equal distances between two adjacent diaphragmed holes are indicated by 12-15.

A variant of the optical scheme with a compact arrangement of LEDs in one place on the outside of the reflector is illustrated in Fig. 3, where the beam divergence angle is 2Θ. A noticeable slight overlap of the radiation beams on top of each other. To create a uniform light flux emerging from the ceiling, it is necessary to use a diffuse reflector 5.

Figure 4 shows a cross section of the design of the lighting lamp with diffuse diffuser 12 dome-shaped. On top of the diffuser is a protective frame grill 13 made of metal or plastic. Radiation 19 from the LEDs incident on the domed diffuser 12, the outer surface of which is covered with a diffuse coating, and exited the device in different directions 14. Under the reflector to the right and to the left of the center line of the lampshade, electric current converters 16 and 17 and mounting plates 16 and 17 for electric mounting LEDs.

A longitudinal section of the design of a rectangular lighting fixture is shown in FIG. 5. LEDs 1 and 2 were located horizontally. Their radiation 19 passed to the diffuser immediately from the LEDs or after reflection from the flat reflector 5. Thanks to the LED formed by the reflector and diffuser, the light more uniformly exited the diffuser. After the flat-shaped diffuser 12, the beams 14 went out into the space surrounding the ceiling. The electric current transducer 15 was placed under the reflector. On the inner side of the protective frame grid 13 was applied reflective coating 20.

Figure 6 shows a cross section of a design variant of a lighting cover with a dome diffuser 12, and Figure 7 shows a top view of a part of the design of a lighting cover with a protective frame grill 13 having a reflective coating 20 on the inside. The electric current converter was in compartments 15 and 18 located under the reflector.

The work of these design options for lighting the ceiling was carried out as follows. When it is included in the on-board network of an armored personnel carrier with a voltage of 27 V or a car with a voltage of 24 V, depending on the number of LEDs and their parallel or serial electrical connection, the electric current converter produced the required voltage. The radiation from the LEDs fell on a diffuse reflector and came out through a transparent glass, or a plastic window, or a diffuser.

A reflective coating on the inside of the protective frame grill helped distribute light to the far upper corners of the vehicle cab.

LEDs with a horizontal arrangement of their optical axial lines partially shone on the reflector, and partially on the diffuser. The radiation from the reflector came out, passing through the diffuser. Thus, the uniformity of the distribution of light exiting from the ceiling was improved.

The uniformity of illumination by the interior light increased as well due to the LED effect in the rectangular light. The LED consisted of a flat reflector 5 (Fig. 5) and a flat diffuser 12, between which there was a small air gap. The radiation from the LEDs, which fell on the diffuser, partially went outside, and some returned to the reflector. Thus, the LED effect was realized, improving the uniformity of illumination.

Literature

1. Auth. certificate No. 1638443 A1, USSR. Lighting device (Cl. F 21 S 1/00. Publ. 30.03.91. Bull. Inventory No. 12) / Kureev A.I., Vashchenko A.F. and Sandursky V.V.

2. Patent No. 5565839, USA. Battery-powered, portable flashing superluminescent light-emitting diode safety warning light (Cl. 340/331. Publ. 10/15/1996) / Poss G.T.

3. Patent No. 2713747, France. Dispositif lumineux de signalization (C1. F 21 Q 3/00. Publ. 12/07/1993) / Valancogne J.-P.

Claims (7)

1. An LED lighting cover, comprising a housing of durable material with an electric current transducer housed therein, a mounting plate with LEDs, the optical axial lines of the radiation beams of which are inclined at an angle to the planes of the housing and the reflector inserted into it, whose outlet is blocked by a transparent partition and an external protective frame grating above it, characterized in that the reflector is equipped with diaphragmed openings for the passage of LED radiation, surface irradiation from azhatelya and transparent walls, wherein a plane passing through the centerline of each LED of the beam line and a line connecting the center of the reflector with LED emission body is inclined to the plane of the housing at an angle α, chosen in the range -π / 2≤α≤ + π / 2. 2. The lighting dome on the LEDs according to claim 1, characterized in that the LEDs are evenly spaced around the circumference of the housing, the axial lines of their beams are directed to the points lying on the inner surface of the interior at equal distances from two adjacent diaphragmed holes, and the number of LEDs is selected from the condition that the sum of the diameters of the spots of illumination of the inner surface of the ceiling is not less than the length of its circumference. 3. The lighting dome on the LEDs according to claim 1, characterized in that the LEDs are mounted inside the lamp housing next to each other with an angle of 2 ° between the horizontal direction of the optical axial lines of their beams equal to the full angle of divergence of the beam, and their number n is π / 2Θ . 4. The lighting dome on the LEDs according to claim 1, characterized in that a prismatic diffuser is used as a transparent partition blocking the outlet of the reflector, and the optical axial lines of the LED beams are mounted vertically relative to the plane of the housing. 5. The lighting dome on the LEDs according to claim 1, characterized in that the LEDs are mounted horizontally on the ends of the rectangular housing with the direction of the optical axial lines of the beams towards each other along the greater side of the housing between the reflector and the diffuser, which serve as the walls of the fiber. 6. The lighting dome on the LEDs according to claims 1-5, characterized in that the protective frame grill is provided with a reflective coating on the inside. 7. The lighting dome on the LEDs according to claims 1-6, characterized in that the LEDs emitting in different ranges of the visible region of the spectrum, for example, in the range 380 ÷ 520 nm, are used.

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