EP1843086A1 - Reflector lamp - Google Patents

Abstract

The lamp (1) has a light source in the form of an LED (2), and a lens (4) mounted between the LED and a reflector (3). The reflector is designed in such a manner that the light emitted from the LED and reflected from the reflector forms a cone of light, whose extension in the lateral direction is larger than in the longitudinal direction. The lens and the reflector are aligned with respect to one another, such that the light from the lens is effectively used.

Description

The present invention relates to a luminaire having a light source in the form of a semiconductor light-emitting element and a reflector.

Reflector lights in the form of floor, ceiling or recessed wall lights are known from the prior art. For example, is from the EP 1 519 102 A2 Such a reflector lamp known, which is particularly suitable as a step reflector lamp. The luminaire has a light source in the form of a light-emitting diode (LED) whose light is directed by a reflector onto a surface to be illuminated, for example a step. However, a radiation in the lateral direction is not provided here, so that the transverse extent of the illuminated area is essentially limited to the corresponding dimension of the reflector lamp.

The present invention has for its object to provide a reflector light, which is particularly well suited for lighting a wide range, in particular for an area that extends in the lateral direction well beyond the dimensions of the light addition.

This object is achieved by a luminaire with the features mentioned in claim 1. The dependent claims further form the central idea of the invention in a particularly advantageous manner.

According to the invention, a luminaire is provided which has a light source in the form of a light-emitting semiconductor element, for example an LED. Furthermore, the luminaire has a reflector, as well as a lens arrangement which is arranged between the semiconductor element and the reflector. In this case, the reflector is designed such that a radiated from the semiconductor element and the reflector reflected light forms a cone of light whose extent is greater in a first direction than in a second direction different from the first direction.

In the following, it is assumed that the lens arrangement is arranged vertically above the semiconductor element and the reflector vertically above the lens arrangement-for the sole purpose of easier describability. For example, therefore, the semiconductor element, the lens array and the reflector may be arranged along a vertical extending vertically upward from a point of the light-emitting surface of the semiconductor element. In this case, the semiconductor element can be oriented in such a way that the surface normal of the light-emitting surface is directed vertically upwards. It is expressly understood that this orientation is purely exemplary in nature and serves solely to make the following description easier to understand. The luminaire can be aligned and operated in any desired orientation with respect to the vertical. The following designations change accordingly in such a case.

It is achieved with the luminaire according to the invention that a particularly wide area can be illuminated, in particular an area whose lateral extent is significantly greater than the lateral extent of the luminaire. As a result, the lamp is suitable for example for illuminating an elongated path section or the like. However, it can also be used for example for the illumination of a corresponding wall or ceiling section or the like.

The lamp is particularly suitable for emergency lighting due to its reliable and long-lasting light source.

The lens arrangement makes it possible to direct the greatest possible proportion of the light emitted by the semiconductor element to the reflector, that is to use the light as effectively as possible, with relatively large spatial freedom of design with regard to the relative arrangement between the LED and the reflector. With the lens arrangement, therefore, the light emitted by the LED light can be concentrated as effectively as possible on the reflector surface.

By "light cone" is meant that spatial, cone-shaped portion which is flooded by the light having a certain minimum intensity. In this case, minimum intensity means an intensity which is at least necessary for illumination. The absolute size of this minimum intensity can vary depending on the specific conditions, in particular the lighting conditions in the environment of the lamp.

The "first" direction may, for example, be a horizontal direction, for example the "transverse direction" from one side to the opposite side, for example from "right" to "left". The second direction may also be a horizontal direction, in particular a direction which extends at right angles to the first direction, that is to say for example a "longitudinal direction".

The lens arrangement may, for example, be a lens, for example a converging lens.

Advantageously, the light-emitting semiconductor element is an unhoused LED.

Advantageously, a rear region of the reflector is arranged closer to the lens arrangement than a front region of the reflector. For example, therefore, the reflector may be arranged obliquely with respect to an optical axis or main axis of the lens arrangement. In this way, it is possible that the light cone does not extend substantially from the reflector in the direction of the lens arrangement (ie, down), but in a direction different from, for example, obliquely downwards. This increases the freedom of design with regard to the relative arrangement of semiconductor and lens arrangement and reflector and thus also with regard to the outer shape of the luminaire. This also makes it possible to arrange the lens arrangement so that it influences the course of the light cone as little as possible undesirable.

Advantageously, the reflector or the reflector inner surface is viewed in a frontal view, ie in a section in a view from the front, down concave shaped. This may in particular be the case for a corresponding cutting plane which runs through the lens arrangement.

Advantageously, the reflector is designed such that the light is reflected by the reflector across two opposite sides and the extent of the light cone in the lateral direction is greater than the extent of the light cone in the longitudinal direction.

Advantageously, more light is reflected by the reflector to one side, as to the opposite other side. For example, more light may mean higher intensity light and / or light that illuminates a larger spatial area. A correspondingly asymmetrical lighting allows greater freedom in the choice of the location for the lamp in relation to the area to be illuminated.

Advantageously, the reflector has a first area with a first surface normal and a second area with a second surface normal, the two surface normals, as seen in the first direction, that is, for example, seen in the lateral direction, having opposite components. The two components can be the same size, for example, in their amount and differ only in their direction. Furthermore, the two surface normals can be identical in their other components. In particular, the forward-facing components can be the same size.

Advantageously, the reflector has an edge which extends at least substantially along a cutting line which results in a section of a lens cone of light formed by the light which leaves the lens arrangement upwards with an upper wall arranged above the lens arrangement , The upper wall may be shaped convexly in particular downwards. By "lens cone of light" is meant that spatial, conical-section-shaped area, which is flooded by the light which, emitted by the semiconductor element, has passed through the lens arrangement and in turn has a certain minimum intensity.

Advantageously, the lamp further comprises a mounting housing, in which the semiconductor element, the reflector and the lens arrangement are arranged, wherein a light exit plane can be defined by an opening in the housing. The edge of the opening can therefore be shaped along a plane.

Advantageously, the light cone passes through the light exit surface at an angle, for example obliquely downwards. This is to express that the light cone is asymmetrical with respect to the surface normal of the light exit plane.

Advantageously, the reflector on faceted mirror surfaces.

Advantageously, the luminaire further comprises at least one further light source in the form of at least one further light-emitting semiconductor element, at least one further reflector, and at least one further lens arrangement, which is arranged between the further semiconductor element and the further reflector.

The at least two semiconductor elements are advantageously arranged laterally next to each other. Furthermore, advantageously, the two reflectors can be arranged laterally side by side. The two lens arrangements can also be arranged laterally next to each other. Furthermore, it can be provided that the further light source, the further reflector and the further lens arrangement are identical to the first light source, the first reflector and the first lens arrangement. In particular, said relative arrangement may extend to each other in the first direction.

Fig. 1

eine schematische perspektivische Ansicht einer erfindungsgemäßen Leuchte,

Fig. 2

eine Ansicht dieser Leuchte von vorne,

Fig. 3

eine schematische Querschnittdarstellung dieser Leuchte und

Fig. 4

eine Draufsicht auf die Leuchte.

Further features, advantages and features will now be explained with reference to a detailed description of embodiments and with reference to the figures of the accompanying drawings. Show it:

Fig. 1

a schematic perspective view of a lamp according to the invention,

Fig. 2

a view of this lamp from the front,

Fig. 3

a schematic cross-sectional view of this lamp and

Fig. 4

a top view of the lamp.

In the figures 1 to 4, a first embodiment of a lamp 1 according to the invention is shown schematically in perspective. It can be seen as the light source, a semiconductor element in the form of an LED 2, here an unhoused LED 2, a reflector 3 and a lens arrangement as a lens, hereinafter referred to briefly as the lens 4, between the LED 2 and the reflector 3, here just above the LED 2 is arranged. According to the example shown, the lamp is designed in the form of a recessed light. For this purpose, the luminaire has a built-in box or a built-in housing 5 with an opening 10, through whose edge a light exit plane 7 can be fixed.

For ease of describability, it is also assumed hereafter (without thereby specifying any limitation, as stated above) that the lens 4 is vertically above the LED 2 and the reflector 3 is vertically above the lens 4. The direction "up" is in Fig. 1 indicated in a small drawn symbolic Cartesian coordinate system with the z-axis. "Front" in this embodiment corresponds to the direction of the surface normal of the light exit plane 7, with the coordinate system selected here thus the x-direction. In the following, the y-direction denotes a lateral direction, namely "left", so that the negative y-direction corresponds to "right". The chosen direction designations are only for easier understanding. It is expressly pointed out that the lamp can be arranged aligned in any orientation with respect to the vertical.

In the example shown, the light-emitting surface of the LED 2 is aligned horizontally. The lens 4 is arranged such that its major axis or optical axis is vertically oriented.

In the orientation shown in Fig. 1, the lamp 1, for example, for illuminating a flat surface, for example, a path portion or any other elongated portion extending in the y direction, serve. However, it is also possible by correspondingly different orientation of the lamp, with the lamp For example, to illuminate a vertical wall section or a ceiling section, for example a room.

In Fig. 2 is a front view of the lamp 1 is shown in Fig. 3 is a schematic cross section, and in Fig. 4 is a plan view. For easier orientation, the respective axes of the selected coordinate system are outlined in the last three figures.

As best seen in the illustration of Fig. 3, the reflector 3 is designed such that its rear portion 31 is lower and thus located closer to the lens 4, as its front portion 32. The reflector 3 is thus inclined with respect to the vertical arranged aligned. In this way, it is possible that the cone of light, which is formed by the light emitted by the LED 2 and reflected by the reflector 3, leaves the lamp 1 obliquely forward down through the light exit plane 7. For example, it can be provided that the main extension of the reflector 3, that is, for example, a connecting line between the rear region 31 and the front region 32 with respect to the horizontal forms an angle between about 10 ° and about 80 °, for example about 25 °. In general, depending on the site this tendency can be chosen so that thereby a dazzling effect of the lamp can be avoided, so a glare-free light is created.

As best seen in Fig. 2, the reflector 3 is designed so that it is viewed in a frontal view, concave down.

The light which is emitted by the LED 2 and impinges on the reflector 3 and is reflected by it, forms a cone of light whose extent in one direction, here in the lateral direction, ie y-direction or the negative y-direction is greater than in a second direction, here the x-direction. In the present case, therefore, this light cone is larger in the lateral extent than in its "longitudinal extent".

As can be seen in particular from the frontal view of FIG. 2, for this purpose, the reflector 3 is shaped such that the light, so to speak, cross to the right and to is reflected to the left. This is indicated very schematically in FIG. 2 by two exemplary light beams 12 sketched. These two exemplary sketched light beams 12 are also sketched in Fig. 3.

The two light beams 12 are reflected at the reflector 3 in the exemplary selected points P and Q on the reflector inner surface. At point P, the reflector 3 thus has a surface normal which has a component directed to the left, that is to say in the positive y direction. At the point Q, the reflector 3 has a surface normal, which has a component directed to the right, that is to say in the negative y direction.

In the present example, the reflector 3 is formed symmetrically with respect to a vertical x-z plane passing through the center of the LED 2. In this way, a light cone is effected, which is symmetrical with respect to said plane. The exemplarily chosen points P and Q may also be symmetrical to said x-z plane. The surface normal of the reflector inner surfaces in the points P and Q therefore have identical components in the x-direction and z-direction. Their components in y-direction differ in sign, but not in amount.

However, there may also be cases in which it is desired or advantageous to effect with the lamp a radiation which is asymmetrical in the lateral direction. For example, this could be the case if the circumstances make it desirable to set up the luminaire in a location that is not centered on the edge of a long side with respect to the surface to be illuminated, but rather off-center. Such unbalanced radiation can be effected by a correspondingly asymmetrical configuration of the reflector surface. For example, for this purpose, therefore, the reflector on one side of the abovementioned x-z plane could have a larger reflector surface than on the other side. Also, by appropriate unbalanced shaping of the reflector surfaces, such an effect can be achieved.

The lens 4 is chosen such that the light emitted by the LED 2 leaves the lens 4 upwards, is directed as effectively as possible to the reflector surface.

This light cone is simply called "lens cone of light" here. The boundaries of the lens cone of light are in turn drawn very schematically in FIGS. 2 and 3 as dotted lines.

The reflector 3 is, as best seen in FIG. 1, mounted on an upper wall 13 and "embedded" in this. The upper wall 13 is fastened in the interior of the installation housing 5. Viewed in the lateral cross-section, the wall 13 is convex downwards. This further contributes to the most effective use of light.

The outer boundary or the edge of the reflector 3 is designed so that it extends at least substantially along a cutting line, which is given by a section of the lens cone of light with the upper wall 13. In this way, the light can be used very effectively. So this contributes to the overall improvement in the efficiency of the lamp.

The reflector inner surface is designed according to this embodiment as a faceted mirror surface.

At the light exit level, a translucent, flat cover is provided, whereby the lamp according to this embodiment is particularly suitable for outdoor use.

In the embodiment shown here, a second LED 2 'is next to the LED 2, next to the lens 4, a second lens 4' and next to the reflector 3, a second reflector 4 'arranged. Thus, two of the said "units" LED 2, lens 4, reflector 3 are arranged laterally next to each other and thus arranged side by side in the direction in which the broader emission takes place. It is also possible to provide three or any number of such units next to each other. The number of selected units LED / lens / reflector is set no specific upper limit. The two units shown by way of example are chosen identical in construction in the embodiment.

The LED 2 is mounted on a carrier board 6. (In the figures, the attachment of the support plate 6 in the mounting housing 5 for the sake of clarity is not drawn.) The second LED 2 'is mounted on a second carrier board 6'. The two mentioned - or generally corresponding to many - carrier boards 6, 6 'can also be provided in one piece or partially in one piece.

Due to the laterally offset arrangement of a plurality of units, an overall even broader emission can be achieved. In this case, due to the superimposing effect of the corresponding two or more light cones, a special design of the illumination can also be achieved, for example by LEDs which emit light in different colors.

For example, it may also be provided to design the two or more units in such a way that they each have a laterally asymmetrical emission characteristic, as indicated above for one unit. For example, in the case of two units, one light cone may be provided for each unit, which irradiates a longer area toward the outer side than the inner side with respect to the installation housing.

The installation housing 5 is parallelepiped in the embodiments shown here, which makes it particularly easy to integrate the luminaire structurally in an environment.

The lamp is due to the relatively reliable and durable light source especially as emergency lighting.

• Die Leuchte hat einen besonders breiten Abstrahlungsbereich.
• Die Leuchte hat einen sehr guten Wirkungsgrad.
• Die äußere Form der Leuchte ist verhältnismäßig frei gestaltbar.
• Die Leuchte ist blendfrei.
• Die Leuchte lässt sich auf einfache Weise in eine Umgebung integrieren.
• Die Leuchte eignet sich besonders gut zur Notbeleuchtung.

The advantages of the luminaire can be summarized as follows:

• The luminaire has a particularly wide radiation range.
• The lamp has a very good efficiency.
• The outer shape of the lamp is relatively freely framed.
• The lamp is glare-free.
• The luminaire can be easily integrated into an environment.
• The lamp is particularly well suited for emergency lighting.

LIST OF REFERENCE NUMBERS

1

lamp

2

LED (LED)

2 '

second LED

3

reflector

3 '

second reflector

4

lens

4 '

second lens

5

installation housing

6

carrier board

6 '

second carrier board

7

Light exit plane

10

Opening in the installation housing

12

light rays

13

upper wall

31

rear area of the reflector

32

front area of the reflector

P

first reflection point on the reflector

Q

second reflection point on the reflector

Claims (13)

Light, comprising a light source in the form of a semiconductor light-emitting element (2), a reflector (3), and a lens arrangement (4) which is arranged between the semiconductor element (2) and the reflector (3), wherein the reflector (3) is designed in such a way that a light emitted by the semiconductor element (2) and reflected by the reflector (3) forms a light cone whose extent is greater in a first direction than in a second direction different from the first direction , Luminaire according to claim 1,
wherein the semiconductor element is an unhoused LED (2). Luminaire according to claim 1 or 2,
wherein a rear portion (31) of the reflector (3) is located closer to the lens assembly (4) than a front portion (32) of the reflector (3). Luminaire according to one of the preceding claims,
wherein the reflector (3) viewed in a frontal view is concave downwards. Luminaire according to one of the preceding claims,
wherein the light is reflected by the reflector (3) across two opposite sides and the extent of the light cone in the lateral direction is greater than the extension of the light cone in the longitudinal direction. Luminaire according to claim 5,
wherein more light is reflected by the reflector (3) to one side than to the opposite other side. Luminaire according to one of the preceding claims,
wherein the reflector (3) has a first region with a first surface normal and a second region with a second surface normal, wherein the two surface normals have opposite components in the first direction. Luminaire according to one of the preceding claims,
wherein the reflector (3) has an edge extending at least substantially along a line of intersection formed at a section of a lens cone of light formed by the light exiting the lens array (4) upward with an upper one Lens arrangement (4) arranged upper wall (13) results. Luminaire according to one of the preceding claims,
wherein the luminaire further comprises a mounting housing (5), in which the semiconductor element (2), the reflector (3) and the lens arrangement (4) are arranged, wherein through an opening (10) in the installation housing (5) a light exit plane (7 ). Luminaire according to claim 9,
wherein the light cone passes through the light exit plane (7) at an angle. Luminaire according to one of the preceding claims,
wherein the reflector (3) has faceted mirror surfaces. Luminaire according to one of the preceding claims,
still having at least one further light source in the form of at least one further light-emitting semiconductor element (2 '), - At least one further reflector (3 '), and - At least one further lens arrangement (4 ') which is arranged between the further semiconductor element (2') and the further reflector (3 '). Luminaire according to claim 12,
wherein the at least two semiconductor elements (2, 2 ') and the at least two reflectors (3, 3') and the at least two lens arrangements (4, 4 ') are arranged side by side.

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