ES2408860B1 - LED LIGHTING WITH REVOLUTION SYNTHRIA. - Google Patents

Abstract

A luminaire (1) is provided comprising: a concave reflector screen (2) with revolution symmetry (Z) with a luminous shielding angle (A), and a light source (4) based on LEDs arranged inside said concave reflector screen. The light source (4) provides by itself or is adapted to provide a conical luminous surface (40) coaxially arranged to the axis of symmetry of revolution of the concave reflecting screen and forming the generatrix of said truncated conical surface with its axis of symmetry a angle (B) smaller than the shielding angle (A) of the concave reflector screen (2); the generatrix (G) of said reflector screen concave a complex curve that is configured so that the relation cos ** IMAGE-01 ** is fulfilled, where {al} is the angle of elevation with respect to the axis of symmetry of the screen of a incident ray ** IMAGE-02 ** from the light source, ** IMAGE-03 ** is a ray reflected by the concave reflector screen and ** IMAGE-04 ** is the unit vector along the axis of symmetry (Z ) from the screen.

Description

  LEO LUMINARY WITH REVOLUTION SYMMETRY.

Scope and prior art

The invention relates in general to a luminaire with a light source based on light emitting diodes of truncated conical configuration and a concave reflector screen with revolution symmetry specially adapted to provide a large aperture of the light beam.

Through luminaires AT-B-386671 and EP 1364 157, luminaires designed in such a way that they do not emit, or barely emit, light at the sides at an angle of, for example, at least 25 ° with the window are disclosed. light emission, ie the so-called shielding angle, in order to prevent annoying reflections. To achieve this, the lamp is arranged so high in the reflector that said light source is not visible from the shielding angle and therefore does not emit direct light at said shielding angle and higher angles. Typically, such luminaires comprise a concave reflector, for example curved in the form of a parabola, which is formed so that

neither

the light reflected by he reflector, light that

short

he flat from symmetry of the reflector, be issue

inside of the

angle from shielding

Summary of the invention

Starting from the state of the art described above, the invention aims to develop a new luminaire with a source

light based on light emitting diodes with an improved light distribution with a large beam opening that adapts to provide general lighting.

The luminaire comprises:

-

a concave reflective screen with revolution symmetry that determines a reflective inner side wall with an outer edge that defines a light emission window having a luminous shielding angle, said light emission window extending perpendicularly to the axis of revolution symmetry of said concave reflector screen, and

-

a light source based on LEDs arranged inside said concave reflector screen near an inner edge of said concave reflector screen; characterized by:

-

The light source itself provides or is adapted to provide a conical luminous surface coaxially arranged to the axis of symmetry of revolution of the concave reflector screen with its larger base lying next to the inner edge of said concave reflector screen and forming the generatrix of said truncated conical surface with its axis of symmetry an angle smaller than the shielding angle of the

screen

reflector concave, from shape that radie light

since

its face outer side; Y

being

the generatrix from bliss screen

reflector

concave a curve complex that is

configured to fulfill the following relationship: cos a ::: ;; f out * (-ü. ~ J where

r out is a ray reflected by the concave reflector screen,

or is the angle of the evasion with respect to the axis of symmetry of the screen of a reflected ray (rout) and üz is the unit vector along the axis of symmetry of the concave reflective screen.

According to an additional feature of the invention, it is an advantage when the light source is essentially constituted by:

-

a plate-shaped socket with an essentially circular central platform concentric to the axis of revolution symmetry of the concave reflector screen with a plurality of LEOs distributed circumferentially in the proximity and exterior of said central platform and a surrounding outer reflecting fin extending from the central platform;

-

an inner reflective part in the form of a piece of revolution coaxial to the axis of revolution symmetry

with

a portion from surface side Exterior

reflector;

Y

a

piece diffuser from light in shape from wall

conical trunk

ready coaxially to the axis from symmetry

from

revolution, determining is piece diffuser the

surface

bright from bliss source from light

According to an additional feature of the invention it is advantageous that the light source socket has an outer surrounding reflecting fin that extends from the socket at an obtuse angle; while its inner reflective piece is a cone trunk whose minor base is the socket.

Also, according to another additional feature of the invention, it is an advantage when the surrounding outer reflecting fin of the light source socket extends from the central platform at a right angle; while its inner reflector piece is configured as a cylinder with a base lying on the base.

Even in accordance with an additional feature of the invention it is advantageous that in the light source socket, its surrounding outer reflecting fin extends from the base or, forming an obtuse angle; while its inner reflective piece is a cone trunk with its main base lying on the base.

Additionally, according to another additional feature, the base comprises a central platform from which its surrounding reflecting fin extends beyond.

Also according to another feature of the invention is an advantage when the light source

is

planned how a license plate from LEOs configured in

shape

from tron wall kitchenette

Too

from agreement with other characteristic

In addition to the invention, it is advantageous to arrange the light source as an OLEO band configured in the shape of a conical wall.

Furthermore, according to another feature of the invention, it is an advantage when the reflective surfaces of the screen are of high reflectivity material.

Even in accordance with an additional feature of the invention it is advantageous that the generatrix of the

screen

bright is modeled according a curve NURB

quadratic

Too

from agreement with a characteristic

In addition to the invention, the light diffuser piece is a phosphor surface, the LEDs being blue, so that the light source provides a white light.

With these measures it is possible to provide in addition to the aforementioned improved light distribution, a better thermal management thanks to an improved heat dissipation that is achieved by the placement of the LEOs on the periphery of the system, reduced optical losses due to a minimal interaction between the light from the source and the reflector and a reduction in the total height of the luminaire thanks to the conical configuration of the light source.

Brief description of the drawings

Other features and advantages of the invention will result more clearly from the description that follows made with the help of the attached drawings, referring to an example of non-limiting execution and in which:

Figure 1 schematically shows a perspective view of a luminaire according to the invention.

Figure 2 is a cross-sectional view of the scheme of Figure 1.

Figure 3 shows a view of the luminaire of the invention similar to Figure 1 to explain the geometry of the concave reflector screen.

Figure 4 illustrates a cross section of the luminaire showing the development of the concave reflector screen generatrix.

Figure 5 shows a perspective view of a luminaire embodiment according to the invention.

Figures 6 and 7 illustrate respective elevational and disassembled views of an embodiment of the light source of the luminaire according to Figure 1.

Figures 8A to SE show details of alternative embodiments of the light source for a luminaire according to the invention.

Detailed description of a preferred embodiment

As shown in the figures, the luminaire according to the invention, generally designated by the reference (1), consists essentially of a concave reflector screen (2) with revolution symmetry (Z) and a light source (4) based in LEOs.

With reference to figures 1 and 2, it can be seen that the concave reflector screen (2) has a reflective inner side wall (20) with an outer edge

(21) defining a light emission window (3) extending perpendicularly to the axis of revolution symmetry (Z) of said concave reflector screen and having a luminous shielding angle (A). It can be further seen that the light source (4) is mounted inside said concave reflector screen (2) in the vicinity of an inner edge (22) thereof.

As also shown in Figures 1 and 2, the light source (4) provides a luminous surface

To avoid rays reflected at elevation angles ex greater than the design, the following condition must be met cas ex S f = t * (-Oz), s i endo

r out: a beam reflected by the concave reflector screen (2) and

ex the elevation angle with respect to the axis of symmetry (Z) of the screen of a reflected beam (rout) from the light source 4,

Oz being the unit vector along the axis of symmetry (Z) of the concave reflector screen. A concave reflector screen generatrix

(2) As explained above, it can be modeled according to a quadratic NURB (Non Uniform Rational BSpline) curve.

As shown in figure 5, the luminaire (1) incorporates an element (5) for heat dissipation generated by the light source (4) based on LEOS. Additionally and even when not shown in the drawing, the luminaire (1) will include appropriate mechanical and electronic elements.

Referring now to FIGS. 6 and 7, in one embodiment of the luminaire (1) according to the invention, the light source (4) consists essentially of a plate-shaped socket (6) with a plurality of LEOs ( 7) arranged along a ring, an inner reflector piece (8) and a light diffuser piece (9) in the form of a conical wall arranged coaxially to the axis of symmetry of revolution

(Z)

from the screen reflector concave (2 ) Y that

determines

the surface 1 bright (4 O) of bliss source

from

light

The socket (6) has an essentially circular central platform (60) concentric to the axis of revolution symmetry (Z) with the plurality of LEOs (7) distributed circumferentially in the outer proximity of said central platform and an outer surrounding reflecting fin (61 ) that extends from the central platform. However, it is possible to arrange said socket (6) only with the surrounding fin (61) I ie without said central platform (60)

The reflective inner part (8) is configured as a piece of revolution coaxial to the axis of revolution symmetry (Z) of the concave reflective screen (2) and has a portion of outer side surface (80) reflecting facing the reflecting surface of the surrounding fin (61) of the socket (6).

As shown in Figure 8A, in a first embodiment, the outer surrounding reflecting fin (61) of the socket (6), extends forming an obtuse angle, the reflecting inner part (8) being configured as a cone trunk with its minor base lying on the socket (6).

According to another embodiment, as illustrated by Figure 8B, the outer surrounding reflecting fin

(61) extends from the socket (6) at a right angle; while its reflective inner part (8) is a cylinder with a base lying on the socket (6).

But as shown in the figure it is in another embodiment, it is possible to configure the externally surrounding reflecting fin internally designated as (61), it can be extended from the socket (6) forming an obtuse angle and the reflecting part being configured

inside (8) like a cone trunk with its major base lying on the socket (6).

Alternatively, as shown in Figure 80, the light source (4) is provided as a LEO plate (10) configured in the form of a wall

(which can take a conical shape (40)

Even in accordance with another embodiment of the invention (Fig. 8. E.), The light source (4) is provided as a band of OLEDs configured in shape

10 conical wall (12) In order to guarantee an adequate performance of the luminous screen, according to the invention, at least one of the reflecting surfaces (2, 61, 80) is made of high reflectivity material, for example a material

15 white or a mirror type surface. It should still be mentioned that the light diffuser piece can be a surface with phosphorus, to obtain a white light source through blue LEDs. As will be easily understood by the

20 persons versed in the art, the above described is merely illustrative of a preferred embodiment of the invention so that technical modifications of all kinds are possible. The object of the invention is sufficiently described

25 In the foregoing, it only remains to point out that the realizations derived from changes in shape, dimensions and the like, as well as those resulting from a routine application of the previously disclosed, should be considered included in its scope, so

30 that the invention will only be limited by the scope of the following claims.

Claims (10)

l. LEO luminaire with revolution symmetry, said luminaire comprising (1):

-

a concave reflector screen (2) with revolution symmetry that determines a reflective inner side wall (20) with an external edge (21) defining a light emission window (3) having a luminous shielding angle (A) extending bliss

I light emission window perpendicular to the axis of revolution symmetry (Z) of said concave reflector screen, and

-

a light source (4) based on LEOs arranged

in

he inside from bliss screen reflector concave

next

to a edge internal (2 2) from bliss screen

concave reflector;

characterized by:

-the

source from light provides by herself or this one

adapted to provide a conical luminous surface (40), coaxially arranged to the axis of symmetry of revolution of the concave reflector screen with its major base lying next to the inner edge of said concave reflector screen and forming the generatrix of said truncated conical surface with its axis of symmetry an angle (B) smaller than the shielding angle (A) of the concave reflector screen, so that it radiates light from its outer side face; Y the generatrix (G g (x)) of said concave reflector screen being a complex curve that is configured to meet the following relationship: cos a ::: ;; Í "out * (-ü",) where r out is a ray reflected by the concave reflector screen, o: is the angle of elevation with respect to the axis of

symmetry

from the screen from a Thunderbolt reflected (rout)

from

the source bright,

üz

is he vector unitary according he axis from symmetry (Z)

from

the reflective screen concave

2 . LEO luminaire with revolution symmetry according to claim 1 characterized in that the light source (4) is essentially constituted by:

-

an essentially circular plate-shaped socket (6) concentric to the axis of revolution symmetry

(Z) of the concave reflector screen with a plurality of LEDs (7), distributed circumferentially in the vicinity of said central platform and an outer surrounding reflector fin (61) extending from the central platform;

-

an inner reflective part (8) in the form of a piece of revolution coaxial to the axis of revolution symmetry (Z) with a portion of outer reflective lateral surface (80); Y

-

a light diffuser piece (9) in the form of a truncated conical wall, coaxially arranged to the axis of symmetry of revolution (Z), this diffuser piece determining the luminous surface (40) of said light source.

3 . LEO luminaire with revolution symmetry according to claim 2, characterized in that in the socket (5) of the light source (4) its outer surrounding reflecting fin (61) extends from the socket (6) forming an obtuse angle; while its reflective inner piece (8) is a cone trunk with its smaller base lying on the socket (6).

Four . LEO luminaire with revolution symmetry according to claim 2, characterized in that in the socket (6) of the light source (4) its surrounding outer reflecting fin (61) extends from said socket, forming a right angle; while its reflective inner part (8) is a cylinder with a base lying on the socket (6).

5 . LEO luminaire with revolution symmetry according to claim 2, characterized in that in the socket (6) of the light source (4) its surrounding outer reflecting fin (61) extends from said socket, forming an obtuse angle! While that its inner reflecting part (8) is a cone trunk with its main base lying on the socket (6).

6. LEO luminaire with revolution symmetry according to at least one of claims 1 to 5,

characterized

by that in he plinth (6) is planned

a

platform central (60) .

7.

Luminary LEO with symmetry from revolution from

according to claim 1, characterized in that the light source (4) is provided as a LEO plate (10) configured as a conical wall (eleven )

8. LEO luminaire with revolution symmetry according to claim 1, characterized in that the light source (4) is provided as a band of OLEOs configured in the form of a conical wall (12).

9. LEO luminaire with revolution symmetry according to the previous claims

characterized in that at least one of the reflecting surfaces (2, 61, 80) are made of high reflective material. 10. LED luminaire with revolution symmetry 5 according to the preceding claims characterized in that the light diffuser piece (9) is a phosphor surface, the LEOs (7) being blue, so that the light source (4) provides a white light. 10 11. LED luminaire with revolution symmetry according to the preceding claims, characterized in that the generatrix of the luminous screen is modeled according to a quadratic NURB curve.