WO2011096837A1

WO2011096837A1 - Method for producing a light-radiating surface and a lighting device for implementing the method

Info

Publication number: WO2011096837A1
Application number: PCT/RU2010/000045
Authority: WO
Inventors: Юрий Борисович Соколов
Original assignee: Общество с ограниченной ответственностью "ДиС ПЛЮС"
Priority date: 2010-02-05
Filing date: 2010-02-05
Publication date: 2011-08-11
Also published as: RU2012103407A; EP2532946A4; CN103026128A; RU2510824C1; EP2532946A1

Abstract

A method for producing a light-radiating surface and a lighting device for implementing the method relate to lighting technology, specifically to LED lighting devices which are intended for producing external and internal lighting. The method for producing a light-radiating surface comprises operations for generating a stream of radiation; establishing the direction of flow of a light-reflecting structure; irradiating luminophore particles forming a first means for transforming the stream of radiation; and using a stream of light to irradiate a second means for transforming the stream of radiation, which means is produced from an optically transparent material and is equipped with scattering means. The lighting device comprises a radiation source in the blue and/or ultraviolet range of the spectrum; a first means for transforming the radiation, which means is equipped with luminophore particles; a light-reflecting structure which can change the radiation direction; and a second means for transforming the radiation, which means is equipped with light-scattering elements, is constructed from an optically transparent material and has a light-radiating surface.

Description

A method of creating a light-emitting surface and a lighting device for implementing the method

The field of technology.

The invention relates to lighting equipment, namely, to LED lighting devices designed to create external and internal lighting. The prior art.

To increase ergonomic indicators, lighting devices should not create glare, sharp changes in the brightness of the radiation surface, causing a feeling of discomfort. The indicated effect is a consequence of the high brightness of the radiation source and its small angular dimensions. Most often this problem is solved by scattering radiation using various means, most often combining both protective and decorative functions, and light scattering functions ^ Another way to solve this problem is to distribute the primary radiation over an extensive light-emitting surface, the surface brightness of which does not cause discomfort and is sufficient to create a standardized level of illumination.

A known method of creating an extensive light-emitting surface, including generating a stream of spherical radiation containing an ultraviolet component; the impact of this flow on the phosphor layer deposited on the inner surface an ellipsoid sheath made of optically transparent material; the phosphor transforms the ultraviolet part of the radiation into visible light of the red region, the spectrum; radiation from direct and converted radiation fluxes from the outer surface of the shell (Z.S. Voznesenskaya et al., “Electric Light Sources”, “Gosenergoizdat”, Moscow, 1957, p.186).

The known method has features similar to the invention and describes the manufacture of mercury gas discharge lamps with corrected color. The application of phosphor particles on the inner surface of the shell is caused by the need to adjust the spectrum of radiation generated by a gas discharge. The known method is an energy- and labor-intensive process, in addition, associated with environmentally hazardous operations for dosing mercury into a cylinder of a gas-discharge light source.

Famous . a method of creating an extensive light-emitting surface, including generating a radiation flux by a set of individual sources, each of which directs the radiation flux to a solid angle; the impact of this flow on the surface element of the luminescent coating deposited on a plate of optically transparent material; conversion of the wavelength of a part of the radiation by a phosphor; radiation of direct and transformed radiation source fluxes from a surface element dS of the plate; integration of elementary light fluxes from all light emitting surfaces of the S plate (RF patent W 2301475, IPC H01063 / 06, publ. 06/20/2007).

The known solution is aimed at creating a uniform brightness of the glow of an extensive flat surface. As a single source of radiation in the known solution, an LED is used. The scattering of the LED radiation occurs in the phosphor layer, the area of the irradiated surface dS on which is determined by the value of the solid angle άΩ. In this case, even after scattering of the incident radiation, the surface brightness of the site dS remains non-uniform and decreases with distance from the optical axis of the LED, which leads to uneven luminosity of the entire light emitting surface S. Preliminary adjustment of the radiation flux distribution using the lens leads to more expensive LEDs, complicating the production of lighting devices and not always justified economically.

A device for creating extensive light emitting is known. and surfaces comprising a housing; a radiation source located inside the housing; a plate of optically transparent material placed opposite the radiation source and provided with a phosphor coating (RF patent W 2301475, IPC NOYUBZ / 06, publ. 06/20/2007).

A disadvantage of the known solution is the unevenness of the luminosity of the light-emitting surface due to diminishing brightness with distance from; axis of the radiation beam incident on the irradiated surface. Besides, the use of the plate significantly limits the possible applications of the known device.

A patent is known in which a light-emitting device is described, including an LED light source of the ultraviolet region of the spectrum and a planar body made of an optically transparent resin containing distributed particles of a phosphor and light-accumulating substances, together with light-transmitting inorganic particles (RF patent DO 2319063, IPC F21V9 / 00, published on June 10, 2006).

An advantage of the known solution is the use of a radiation source invisible to the observer. The drawback of this solution is the structural complexity of a multicomponent panel, the manufacture of which in itself is a complex technical problem and, most likely, an expensive product. Besides . Moreover, the luminous intensity declared in the description of 15.5 cd / m2 seems to be clearly insufficient _. to create lighting devices designed for general lighting.

A device is known for general and local lighting, containing ultraviolet light emitting diodes located along the axis of an optically transparent tube, on the surface of which there is a phosphor layer that converts invisible radiation into visible light (patent P2002133910, MKI F21S8 / 04, published May 10, 2002). A disadvantage of the known solution is the placement of radiation sources in a narrow tube closed at the ends, which limits the choice of the shape of the light-emitting surface. In addition, it is difficult to remove heat from the LEDs in the pipe, and overheating of the LEDs reduces their light emitting ability. Most likely, the known design is designed to use low-power LEDs and is not able to create the level of illumination necessary for general lighting.

Known lighting system comprising a housing, means for connecting to a source

electrical power; a series of light emitting diodes installed inside the housing and emitting a wavelength to excite a phosphor susceptible to the ultraviolet region of the electromagnetic

spectrum; voltage conversion means for using said light emitting diodes;

transparent plate having an inner

the surface covered with a phosphor, through which passes the light excited by the phosphor, visible to the naked eye (US patent No. 6068383, MKI F21S8 / 04, publ. 30.05.2000).

A disadvantage of the known analogue is the loss of light flux: emitted by LEDs to the sides of the optical axis, as well as the uneven luminosity of the light-emitting surface,

due to the diminishing brightness of the light flux incident on the irradiated surface as it moves away from its optical axis and the absence of surface brightness equalizers

light emitting surface and color glow.

The technical result of the invention is to increase the uniformity of the color of the radiation and

light emitting surface brightness

surface expansion technological

opportunities for designing lighting devices with such a surface.

The method of creating a light-emitting surface is characterized by the following set of essential features:

A method of creating a light-emitting surface, including generating a radiation flux by an LED emitter; the formation of the direction of the radiation flux by the surface of the reflective structure; irradiation of the phosphor particles formed by the radiation flux forming the first radiation flux conversion means; radiation of phosphor particles of the visible light flux; irradiation with visible light flux of the second radiation flux conversion means configured to diffuse the light flux and made of optically transparent material; radiation from the surface of the second means of converting the visible light flux.

A variant of the method involves changing the sequence of conversion of the radiation flux, in: according to which it is first converted; wavelength of the radiation flux of the LEDs, and then the direction of the radiation flux is formed by the surface of the reflective structure. In the latter embodiment, the change in the sequence of conversion of the radiation of the LEDs does not affect the claimed technical result.

A lighting device _/ implements a method of creating a light-emitting surface is characterized by the following set of essential features:

Lighting; a device containing a light source, including, at least one

LED emitter placed on the board and generating a radiation flux in blue and / or

ultraviolet region of the spectrum; first radiation flux conversion means made in the form of phosphor particles; reflective

a structure configured to form the direction of the radiation flux; second radiation conversion means provided

light scattering elements made of an optically transparent material and including a light emitting surface.

Under the essential tag, formulated as "the first means of converting flow

radiation "in this invention means a set of phosphor particles, the spatial arrangement of which is determined by the configuration of the part in the volume or surface of which these particles are contained.

The following features of the invention should be indicated as developing and / or clarifying features: -the composition of the phosphor particles of the first radiation conversion means is selected with the possibility of creating a luminous flux in the visible part of the spectrum / -the first radiation conversion means includes phosphor particles having an afterglow effect, which not only contribute to the alignment of the light flux, but also provide an additional technical result in the form of an emergency evacuation lighting;

-first stream conversion tool

radiation is placed on the surface and / or in the material of the optically transparent substrate, which is a variant of the structural embodiment of the specified funds.

The term "substrate", the applicant understands the structural element made of an optically transparent material capable of creating both rigid and flexible surfaces;

the first radiation conversion means is placed on the surface and / or in the material

optically transparent substrate covering

LED emitter being

structural carrier of the first tool

radiation conversion;

-the substrate covering the LED is made in the form of a hollow three-dimensional figure, the wall thickness of which depends on the optical properties of the material and is determined taking into account the minimum possible losses of the radiation flux and technological capabilities of its manufacture, while the optimal

consider the implementation of this embodiment of the substrate in the form of a hemisphere or paraboloid of revolution; -the surface of the optically transparent substrate is structured, which allows

to carry out preliminary scattering of the light flux and helps to improve the conditions for achieving uniformity of brightness of the light-emitting surface;

-first stream conversion tool

radiation applied to a structured

the surface of the substrate, while increasing the area of radiation conversion;

-first stream conversion tool

radiation applied to the surface optically

a transparent flat substrate installed at a distance of hi mm from the reflective structure, the value of which is selected from the interval hi ^ 40, in order to equalize the brightness of the boundary sections of the light spots, both due to superposition and interference of light waves;

-the second radiation conversion means is made in the form of a _^ plate, inside or on one of the surfaces of which light-scattering elements are placed, and which simultaneously with the scattering of the light flux and the fulfillment of the light-emitting function, is a protective element

lighting device;

- surface light-scattering elements are made in the form of a regularly repeating relief that does not have sharp edges, for example, in the form

hemispheres;

- the plate of the second conversion means is placed at a distance h2 from the first radiation conversion means, the carrier of which is a transparent flat substrate, while h2 does not exceed 50 mm, and the choice of distance, taking into account these conditions, allows you to align

illumination of the surface of the plate and level differences in color radiation;

- the plate of the second conversion means is equipped with phosphor particles and is placed at a distance H from the reflective structure, while H does not exceed 50 mm, and the choice of distance, taking into account these conditions, allows you to even out the illumination of the surface of the plate and level differences in the color of the radiation;

reflective structure formed

reflectors equipped with diffuser

a surface, each of which is placed around one of the LED emitters;

-reflective structure, contains regularly located reflectors, the surface of which is recessed into the board:; wherein the LED is located in the indicated recess and is equipped with the first radiation conversion means, and the second means

radiation conversion is made in the form

a plate installed at a distance H from the board, the value of which does not exceed 50 mm;

-the surface of the reflectors is made conical, and its guide. is a p-gon,

where 4 ^ n ^ ⁰⁰ ;

-guide; reflectors selected as an equilateral quadrangle, or

hexagon, or circle, that technologically is the most convenient design option reflective structure;

LED emitters are grouped into linear clusters, |. equipped with linear

reflectors forming reflective

structure, while the execution of the clusters linear allows you to expand the possible variants of the embodiment of the invention and improve manufacturability

construction;

-linear reflector has a trapezoidal, parabolic or semicircular profile, which

Technologically, it is the most convenient design option for a reflective structure in the case of the arrangement of LED emitters in the form of linear clusters.

The invention is illustrated by the following graphic materials illustrating a method for creating a light-emitting surface and embodiments of the method in specific lighting devices:

figure 1 | shows a scheme for creating a light-emitting surface in the case of placing the first radiation conversion means on a flat optically transparent substrate;

figure 2 shows a diagram of the creation of a light-emitting, \ surface in the case of placement of the first radiation conversion means in a bulk optically transparent shell;

on figs; a fragment of a top view of a lighting device is shown, a diagram of which is shown in Fig. 1, the reflective structure of which formed by reflectors in the form of an equilateral tetrahedral pyramid;

figure 4 shows a fragment of a top view of the lighting device shown in figure 2, reflective. the structure of which is formed by reflectors in the form of a direct circular cone;

figure 5 shows a top view of a lighting device with linear clusters of LEDs and a reflective structure in the form of linear reflectors;

figure 6 shows a top view of a lighting device with a linear cluster of LEDs enclosed in a three-dimensional substrate and a reflective structure in the form of linear reflectors;

in Fig.7 _; shows a side view of a variant of the lighting device containing reflectors placed in _;; board recesses around the LED emitters,

A brief description of the drawings.

The lighting device (figure 1) contains an LED emitter 1 located on the board 2, a reflective structure 3, a flat substrate 4, placed at a distance hi from the reflective

I

structure 3 and equipped with the first radiation conversion means in the form of phosphor particles 5 deposited on the surface of the substrate 4, the second radiation conversion means in the form of a plate b placed at a distance h2 from the plane substrate and equipped with a structured surface 7.

Lighting device - (figure 2) contains an LED emitter 1 located on the board 2; first means for converting radiation-particles of the phosphor 5 (not shown in FIG. 2), enclosed in the material of the bulk substrate 8, covering the LED source 1; reflective structure 3; the second radiation conversion means in the form of a plate 6 placed at a distance H from the reflective structure 3 provided with a structured surface 7.

A lighting device (Fig. H) that implements a method of creating: a light-emitting surface, shown in the diagram of Fig. 1, contains an LED emitter 1, implemented in the form of, for example, semiconductor:;, crystals mounted on a circuit board 2. Placed along the radiation flux conversion reflective structure 3, containing reflectors 9 for each group of radiation sources 1; an optically transparent substrate 4 provided with first radiation conversion means in the form of phosphor particles (not shown in FIG. 5); a light scattering plate b having a light emitting,; _; surface 7 provided with regularly repeating relief.

Lighting. , a device (Fig.) that implements a method of creating.: the light-emitting surface shown in the diagram of Fig. 2 contains LED emitters (not shown in Fig.) mounted on a circuit board (not shown in Fig. 4) and placed on during the conversion of the radiation flux: an optically transparent bulk substrate 8 provided with phosphor particles (not shown in FIG. 4); a reflective structure 3 containing reflectors 9 for each bulk substrate 8; svetorasseivayuschukg ^'plate 6 having a light emitting surface 7 is provided with a regularly recurring relief.

The lighting device (Fig. 5), which implements the method of creating a light-emitting surface according to the scheme of Fig. 1, contains LED emitters 1 grouped in the form of linear clusters mounted on the board 2 and equipped with a reflective structure 3 containing linear reflectors 9 located along the respective linear clusters LED emitters 1. Further along the radiation flux there are: an optically transparent substrate 4 with phosphor particles (not shown in FIG. 5), covering the clusters of LEDs 1 and light scattering a plate 6 having a light emitting surface 7 provided with a regularly repeating relief.

The lighting device (Fig.6) that implements the creation method. the light-emitting surface shown in the scheme of figure 2, contains LED emitters (not shown in Fig.6), placed on the boards (not shown in Fig.6) in the cavity of the optically transparent bulk substrate 8, including the first means of converting the radiation of the shell of the phosphor particle ( 6 not shown). A group of these bulk substrates 8, is placed on one lines. and is equipped with linear reflectors 9 of a reflective structure 3 installed along the corresponding row of volume substrates 8. Next, along the direction of the radiation flux reflected from the surface of the reflectors 9, a light-diffusing plate 6 is installed having a light-emitting surface 7 provided with a regularly repeating relief.

Two more options, a lighting device that implements a method of creating a light-emitting surface are shown in Fig.7 and Fig.8.

7, the reflective structure 3 includes regularly arranged reflectors' 9, the surface of each of which is recessed into the board 2; the first means of converting radiation-particles of the phosphor 5, placed inside or on the surface of a flat substrate 4, placed at a distance hi of not more than 40 mm from the reflective surface. structures 3. The second means of transformation; radiation, made in the form of a light scattering plate 6, is placed at a distance h2 from the flat substrate 4, while h2 does not exceed 50 mm

On Fig reflective structure 3, includes regularly located reflectors 9, the surface of each of which is recessed into the board 2; a radiation source circled by the first conversion means _; radiation - phosphor particles are placed on the board 2 in the cavity of the reflector 9, and the second radiation conversion means, made in the form of a plate b, is installed on the distance H from the reflective structure 3, while the value of H does not exceed 50 mm

Industrial applicability

Parts and components for a lighting device can be manufactured by known methods. The information presented in the description is sufficient for a specialist to understand the principle of operation and design of devices that implement methods for creating a light-emitting surface.

Claims

Claim:

1. A method of creating a light-emitting surface, comprising generating radiation, at least one LED emitter located on the board; the formation of the direction of radiation by the surface of the reflective structure; irradiating the first radiation conversion means made in the form of phosphor particles; radiation of phosphor particles of the light flux in the visible region of the spectrum; scattering of the light flux from the phosphor by the second radiation conversion means made of an optically transparent material; radiation of the light flux from the surface of the second conversion means.

2. A method of creating a light-emitting surface, including: generating a radiation flux by at least one LED emitter located on the board; irradiating the first radiation conversion means made in the form of phosphor particles; radiation of phosphor particles of the light flux in the visible region of the spectrum; the formation of the direction of the radiation flux by the surface of the reflective structure; scattering

SUBSTITUTE SHEET (RULE 26) the luminous flux reflected from the reflective structure, the second means of converting radiation made of optically transparent material; radiation of diffused light flux from the surface of the second radiation conversion means.

3. A lighting device comprising at least one LED emitter located on a board; first radiation conversion means formed by phosphor particles; a reflective structure configured to form a radiation direction; second radiation conversion means provided with light scattering elements made of an optically transparent material and having a light emitting surface ..

. A lighting device comprising at least one LED emitter placed on a board and generating a radiation flux in the blue and / or ultraviolet region of the spectrum; a reflective structure configured to form a radiation direction; the first means of converting radiation,

SUBSTITUTE SHEET (RULE 26) formed by phosphor particles; second radiation conversion means provided with light scattering elements made of an optically transparent material and having a light emitting surface.

5. The lighting device according to paragraph 3 or paragraph 4, characterized in that the composition of the phosphor particles of the first radiation conversion means is selected with the possibility of creating a light flux in the visible part of the spectrum.

6. The lighting device according to paragraph 5, characterized in that a phosphor with an afterglow effect is introduced into the phosphor particles.

7. The lighting device according to paragraph 3 or paragraph 4, characterized in that the phosphor particles are placed in the material and / or on the surface of the optically transparent substrate.

8. The lighting device according to paragraph 3, characterized in that the phosphor particles are placed in the material and / or on the surface of the optically transparent substrate, made in the form of a shell covering the LED emitter.

SUBSTITUTE SHEET (RULE 26)

9. The lighting device according to paragraph 4, characterized in that the phosphor particles are placed in the material and / or on the surface of the optically transparent substrate, made in the form of a sheet.

10. The lighting device according to paragraph 8, characterized in that the shell is made in the form of a hollow three-dimensional figure, for example, in the form of a hemisphere or paraboloid of revolution;

11. The lighting device according to paragraph 7, characterized in that the substrate is provided with a structured surface.

12. The lighting device according to paragraph 11, characterized in that the phosphor particles are deposited on the structured surface of the substrate.

13. The lighting device according to paragraph 9, characterized in that the substrate is installed at a distance of hi mm from the reflective structure, the value of which does not exceed 40 mm

one . The lighting device according to paragraph 3 or paragraph 4, characterized in that the second radiation conversion means is made in the form of a plate of optically transparent material, inside or on

SUBSTITUTE SHEET (RULE 26) the surface of which are placed light-scattering elements.

15. The lighting device according to claim 3, characterized in that the second radiation conversion means 95 is made in the form of a plate mounted at a distance of H mm from the reflective structure, the value of H not exceeding 50 mm.

16. The lighting device according to paragraph 4, characterized in that the second conversion means

100 radiation, made in the form of a plate placed at a distance h2 from the substrate of the sheet equipped with the first radiation conversion means, while h2 does not exceed 50 mm

17. The lighting device according to paragraph 3 or

105 paragraph 4, characterized in that the reflective structure is formed by reflectors provided with a diffusing surface, each of which is placed on the same optical axis with one of the LED emitters.

ON 18. The lighting device according to paragraph 4, characterized in that the reflective structure contains regularly arranged reflectors, the surface of each of which is recessed into the board,

SUBSTITUTE SHEET (RULE 26) and the second radiation conversion means, 115 made in the form of a plate equipped with phosphor particles and installed at a distance h3 from the board, the value of which does not exceed 50 mm.

19. The lighting device according to paragraph 17, characterized in that the surface of the reflectors 120 is conical, and its guide is a square, where 4 ^ n ^ ⁰⁰ .

20. The lighting device according to paragraph 19, characterized in that the guide of the reflectors is selected in the form of an equilateral quadrangle, or 125 hexagon, or circle.

21. The lighting device according to paragraph 3 is different. the fact that the LED emitters are grouped into linear clusters, each of which is equipped with a common linear reflector.

130 22. The lighting device according to paragraph 21, wherein the linear reflector has a trapezoidal, parabolic or semicircular profile.

SUBSTITUTE SHEET (RULE 26)