ES2408860A1 - Led luminaire with revolution symmetry. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A luminaire (1) is provided comprising: a concave reflecting screen (2) with revolution symmetry (z) with a luminous shielding angle (a), and a light source (4) based on leds disposed inside of said concave reflecting screen. The light source (4) provides by itself or is adapted to provide a frustoconical luminous surface (40) arranged coaxially to the axis of symmetry of revolution of the concave reflecting screen and forming the generatrix of said frustoconical surface with its axis of symmetry a angle (b) smaller than the screening angle (a) of the concave reflecting screen (2); the generatrix (g) of said reflector screen concaves a complex curve that is configured so that the relation cos ** image-01 **, where α is the angle of elevation with respect to the axis of symmetry of the screen of an incident ray ** picture-02 ** coming from the light source, ** picture-03 ** is a ray reflected by the concave and reflective screen ** image -04 ** is the unit vector according to the axis of symmetry (z) of the screen. (Machine-translation by Google Translate, not legally binding)

Description

LED LIGHTING WITH REVOLUTION SYNTHRIA.

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 documents AT-B-386671 and EP 1364157, 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 emission window are disclosed of light, that is to say 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 light source based on light emitting diodes with an improved light distribution with a large beam aperture that adapts to provide lighting general.

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 provides itself 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 cone 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 meet the following relationship: cos ex: S; rout * (-uz) where

rout is a ray reflected by the reflecting screen

concave,

to

is he angle from elevation respect of the axis from

symmetry of

the screen of a Thunderbolt reflected (rout)

Y

Uz

is he vector unitary according he axis from symmetry of the

concave reflector screen.

From

agreement with a characteristic additional from the

The invention is an advantage when the light source is essentially constituted by: a plate-shaped base with an essentially circular central platform concentric to the axis of

Revolution symmetry of the concave reflector screen with a plurality of distributed LEDs

circumferentially in the outer proximity of said central platform and an outer surrounding 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 a further feature of the invention, it is advantageous that the light source socket has an outer surrounding reflecting fin extending 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 a further feature of the invention, it is advantageous that in the light source socket, its surrounding outer reflecting fin extends from the socket, forming an obtuse angle; while its inner reflective piece is a cone trunk with its main base lying on the socket.

Additionally, according to another additional feature, the socket comprises a central platform from which its surrounding outer reflector fin extends.

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

is

planned how a license plate from LEDs 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 a band of OLEDs configured in the form 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.

Still agree with an additional feature of

the invention is advantageous that the generatrix of the light screen is modeled according to a NURB curve

quadratic

Also according to an additional feature of 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, better thermal management thanks to an improved heat dissipation that is achieved by placing the LEDs 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

view

in perspective from a luminary according to the

invention.

The

figure 2 is a view in section cross

of the scheme in 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 generatrix of the concave reflector screen. Figure 5 shows a perspective view of a luminaire embodiment according to the invention.

The

figures 6 Y 7 illustrate respective views in

raised

Y disassembled from a shape from realization from the

source

from light from the luminary according the figure one.

The

figures 8A to 8E show details from

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 LEDs.

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

(40) in the form of a truncated conical side wall, arranged coaxially with the axis of revolution symmetry (Z) of the concave reflector screen and with its larger base lying next to the inner edge (22) of said concave reflector screen. Additionally, it can be seen that the generatrix of said truncated conical surface (40) forms with its axis of symmetry (Z) an angle (B) smaller than the shielding angle (A) of the concave reflector screen.

The concave reflector screen (2) is a concave revolution surface with a complex generatrix curve (G) whose development will be explained by

continuation

with the help from the figures 3 Y Four.

How

may be seen in the figures 3 Y 4, the

generatrix

(G), is defined in a flat (YOU) that

contains

he axis from symmetry (Z) Y a segment (cp)

tangent to the truncated cone surface (40) of the light source (4) and extending to the outer edge

(21) of the concave reflector screen, in this case the elevation angle ex with respect to the axis of symmetry (Z) being the value of the shielding angle

(TO). The generatrix (G) is a complex curve g (x) for any point (p) of which, as shown in Figure 4, a reflected outgoing rout beam and an incident rcp beam coming from the truncated conical surface

(40) fulfill the following relationship:

rout = rcp -2 (n * rcp) * n, the normal unit vector being expressed to the generatrix (G) at that point as: n = [1 (dg (x) / dx) 2 Jl / 2 * [(dg (x) / dx) * Ux -uzJ, where Ux and Uz are the unit vectors along the Z and x axes.

To avoid rays reflected at angles of

elevation ex greater than the design, the following condition must be fulfilled cos ex ~ f = t * (-üz), with 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 ray (fout) from the light source 4,

Üz 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 LEDS. Additionally and even when it is 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 LEDs ( 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 bright (4 O) of bliss source

from

light.

The socket (6) has a central platform (60)

essentially circular concentric to the axis of symmetry of revolution (Z) with the plurality of LEDs (7) distributed circumferentially in the outer proximity of said central platform and an outer surrounding reflecting fin (61) extending

since

the platform central. Do not however, is possible

provide

saying plinth (6) only with the fin

surrounding

(61), is tell without the cited platform

central

(60)

The reflecting inner part (8) is configured as a piece of revolution coaxial to the axis of revolution symmetry (Z) of the concave reflecting screen (2) and has a portion of outer side surface (8 O) 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 in 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 8E, the surrounding outer 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 Figure 8C in another embodiment, it is possible to configure the outer 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 8D, the light source (4) is provided as a plate of LEDs (10) configured as a wall

(ll) that you can adopt

shape conical trunk (40)

Yet

from agreement with other realization from the

invention

(Fig. 8. E.), the source from light (4) is

planned

how a band from OLEDs configured in shape

from

conical wall (12)

To ensure adequate performance of the light shield, according to the invention, at least one of the reflecting surfaces (2, 61, 8O) is made of high reflectivity material, for example a white material or a mirror-like 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 readily understood by persons versed in the art, the foregoing is merely illustrative of a preferred embodiment of the invention so that technical modifications of all kinds are possible.

Sufficiently described the object of the invention in the foregoing, it only remains to point out that the embodiments derived from changes in shape, dimensions and the like, as well as those resulting from a routine application of the above disclosed, should be considered included in its scope, so that the invention will only be limited by the scope of the following claims.

Claims (10)

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

-

a concave reflector screen (2) with revolution symmetry that determines a reflecting inner side wall (20) with an external edge (21) defining a light emission window (3) having a luminous shielding angle (A), said light emission window extending perpendicular to the axis of revolution symmetry (Z) of said concave reflector screen, and

-

a light source (4) based on LEDs disposed within said concave reflector screen near an inner edge (22) of said concave reflector screen; characterized by:

-

the light source 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 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 (E) smaller than the shielding angle (A) of the concave reflector screen, so that light radiates 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 ex: S; rout * (-uz) where rout is a ray reflected by the reflecting screen concave, a is the angle of elevation with respect to the axis of screen symmetry of a reflected ray (rout) from the light source, Uz is the unit vector along the axis of symmetry (Z) of the concave reflector screen. 2. LED luminaire with revolution symmetry according to claim 1 characterized in that

the

source from light (4) is essentially constituted

by:

a

plinth (6) in shape from plate essentially

circular concentric to the axis of symmetry of revolution (Z) of the concave reflector screen with a plurality of LEDs (7), distributed circumferentially in the outer proximity of said central platform and an outer surrounding reflecting 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. LED 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.

LED 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.

LED 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 its reflective inner piece (8) is a cone trunk with its major base lying on the socket (6).

6.

LED luminaire with revolution symmetry according to at least one of claims 1 to 5, characterized in that a central platform (60) is provided in the socket (6).

7.

LED luminaire with revolution symmetry according to claim 1, characterized in that the light source (4) is provided as a plate of LEDs (10) configured in the form of a truncated conical wall

(eleven )

8.

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

9.

LED luminaire with revolution symmetry according to the previous claims

characterized in that at least one of the reflecting surfaces (2, 61, 80) are of high reflectivity material. 10. LED luminaire with revolution symmetry of 5 according to the preceding claims characterized in that the light diffuser piece (9) is a phosphor surface, the LEDs (7) being blue, so that the light source (4) provides a white light. 10. 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. z ./ 40 ~  ! ____----- v '------__ y' - ~ ------ + --- ~ }  \ 21 20 Figure 1. 1 I z ./ 22 I ¿-40 ~ I l \ 2  / ~, \ ¿ 4 / '9  Go\    i \ ,..,F\  I 3 /) 21 / LV Figure 2 40 22 Figure 3 z I X Figure 5 z I I 40 Figure 6 Figure 7 FIG. 8A FIG. 8B z  4'\,. one)   .--one\' FIG. 8e 9 //  4-\. ~)! FIG. 80 / V ~ 40- / ~ LL ______ z Figure 8