WO2013143514A1

WO2013143514A1 - Lamp

Info

Publication number: WO2013143514A1
Application number: PCT/DE2012/000951
Authority: WO
Inventors: Tim BUHL
Original assignee: Yangdong Fitech Technology Co. Ltd.
Priority date: 2012-03-28
Filing date: 2012-09-27
Publication date: 2013-10-03
Also published as: DE202012003725U1; CN104321585A; CN104321585B

Abstract

The invention relates to a lamp comprising a light source, which is preferably a light-emitting diode (14) surrounded by a reflector (11) having the shape of a truncated cone or ellipsoid of revolution, and comprising an attachment lens (12). In order to be able to set a uniform light distribution in a variable manner at different distances in conjunction with as little loss of light as possible, it is proposed that the attachment lens is embodied as a Fresnel lens which is arranged within the envelope surface of the reflector and is displaceable relative to the light source.

Description

lamp

The invention relates to a lamp with a light source, preferably a

LED is, which is surrounded by a reflector, which takes the form of a

Truncated cone or a rotational ellipsoid possesses, and a conversion lens.

To create a perceived pleasant room lighting, several factors must be considered. In addition to the optionally adjustable brightness of a non-source and the so-called color temperature with which the light source radiates, in particular a largely homogeneous illumination, i. H. a substantially same light intensity desired in a given space or area segment.

Passive optical components are lenses in which a fundamental distinction is made between so-called converging lenses and diverging lenses. Theoretically, a converging lens, at the focal point of which the light source is placed, can produce parallel light. Apart from the fact that in practice there are neither punctiform light sources nor ideal converging lenses, a correspondingly large and heavy converging lens would be required for large-area illumination. In practice, it has therefore begun to use lens systems consisting of several collection and diverging lenses. The disadvantage of such lens systems lies in a relatively large height.

A Fresnel lens or more precisely a Fresnel Fresnel lens has at least one, usually a plurality of annularly arranged steps with curved surfaces. The optically effective surfaces of the annular portions correspond to annular parts of a condenser lens. In order to produce no disturbing refractions and reflections through the steps, the steps are usually arranged parallel to the main propagation direction of the light. The advantage of the Fresnel Fresnel lens is in particular its lower height and the much lower weight. In many cases, such stepped lenses are combined with so-called diffusing discs, with which a targeted diffusion effect is generated. par- It is avoided with lenses that the light source is imaged over the lens as an image at a certain spatial distance.

It is also known to change the cone angle of the emitted light by changing the distance of the light source from the lens.

Another measure for avoiding light losses is to absorb light emitted laterally or rearwardly through a reflector and to guide it to a lens or a lens system or a Fresnel lens. The simplest form of combination of a reflector with a light source and a lens can be found in known prior art flashlights. There, a reflector body which is displaceable relative to the light source is fixedly connected to the light exit side with a converging lens which at the same time shields the reflector from dirt and moisture from the outside. The extent to which the cone angle is adjustable is limited by the Verschubweg. As far as a large displacement path of the reflector is chosen in relation to the light source, this is usually at the expense of a homogeneous light emission, which is then no longer achievable.

It is an object of the present invention to further develop the aforementioned lamp in such a way that with the smallest possible loss of light a uniform light distribution at different distances is variably adjustable.

This object is achieved by the measure according to claim 1. According to the invention, the conversion lens is designed as a Fresnel lens (Fresnel Fresnel lens), which is arranged within the (inner) envelope surface of the reflector and is displaceable relative to the light source.

The choice of the Fresnel Fresnel lens allows a flat design of the lamp, which in a similar way (compared to lens systems) has a smaller weight. The arrangement of the Fresnel Fresnel lens within the envelope surface of the reflector advantageously offers the possibility that only a selected inner region of the light emitted by the light source, in particular the light emitting diode is refracted by the Fresnel lens, while the laterally emitted therefrom portion of the light cone directly the reflection surface of the reflector hits, from where it is reflected forward. The displacement of the Fresnel lens can produce different emission characteristics. This is particularly important if one and the same lamp is to be arranged in different high rooms or in different room heights, after which the light distribution is optimized by displacement of the Fresnel lens according to the position of the lamps.

Further embodiments of the invention are described in the subclaims. Preferably, the reflector and the Fresnel lens are integrally connected. This measure can be essentially simplify the usability and make the installation cheaper.

According to a further embodiment of the invention, the Fresnel lens is arranged on the end side of a tubular body part which is at the same time designed as a guide for a linear displacement. This tube is concentric with the reflector housing, which has the shape of an ellipsoid of revolution or a cone. For optical reasons, a cone is preferably used. Further preferably, the reflector is made of polycarbonate.

Preferably, the diode is arranged in a space closed to the outside, apart from ducts for the air supply and the air discharge, the walls of which are formed by the tubular body part on the one hand and by the board on which it is mounted on the other hand.

According to a further embodiment of the invention, the LED is arranged in a housing designed as a hollow cylinder, which has a plurality of annular, substantially over the entire height extending chambers having a allow chimney effect-like air flow. In particular, the LED driver for the LED used is arranged in one of the air-flow chambers.

The light-emitting diodes developed in the meantime with greater power require cooling, which is to be ensured by heat sinks according to the prior art. These heatsinks, which are to deliver the heat flowing there to the outside air, usually have large arms that oppose a desired handsome lamp design.

With the described embodiment of the invention, however, a flow effect is exploited, in which the heated air generated within the housing or within the annular chambers flows upwards and flows out there via openings provided. In this way, the LED driver is cooled.

To cool the LED, which is shielded on a circuit board to the outside, an opening is used, which opens into the closed space in which the LED is located and which is open at the top. The air supply is supplied via a channel, which also leads into the closed chamber in which the LED is arranged, so that the intake fresh air absorbs heat and dissipates it upwards. The cooling system is thus based on a pure heat dissipation by air flow.

Further advantages and variants of the present invention are described in the drawings. Show it:

Fig. 1 is a perspective view of a lamp according to the present invention

Invention,

Fig. 2 shows the same perspective view as a partial section along the line L-L in

Fig. 1, 3 + 4 two longitudinal sections of the lamp according to the invention with different settings,

Fig. 5 + 6 + 7 different views of the consisting of a reflector and a Fresnel Fresnel lens unit and

Fig. 8 is a view of a holder for receiving chamber-forming

Segments.

As can be seen from Fig. 1, the lamp shown consists of a cylindrical shaped as a hollow body 10 lamp housing having a device 101 for attaching the lamp to a suspension rope, a hook or the like. Below the hollow body, a reflector 11 is arranged, which is formed in the present case frustoconical. The reflector forms a one-piece part with a Fresnel stepped lens 12 fixed and arranged in a tubular body part 13. The tubular body part 13 is displaceable relative to the hollow body 10 together with the reflector. Since the LED 14 is arranged on a board in the foot part of the hollow body 10, the distance of the LED 14 from the Fresnel lens can be varied by the displacement of the reflector 11 in the direction of the double arrow 15. The reflector 11 is made of a polycarbonate. The reflection is effected either by a total reflection or by a mirrored inner surface. The tubular body part 13 is slidably guided along the outer cylinder 16 on which it partially rests. In the hollow body 10, an LED driver 17 is further arranged, wherein 10 different segment-like chambers are formed over existing partitions within the cavity of the hollow body. In one of the outer segment chambers 18, which is open at the bottom, there is an upward air flow in the direction of the arrow 181, so that the air heated in the chamber 18 by the LED driver rises to the top, where it can flow through existing openings 182.

In the middle of the hollow body 10 are adjacent to each other a plurality of chambers, wherein in an outer chamber 19 there is an upward flow, which in the direction of Arrow 191 is effective. This chamber opens into an upper opening 20, whereas an adjacent chamber 21 draws in air through the opening 22, which flows downwards, since the air movement in the direction of the arrow 191 creates a suction effect.

Between the tubular body part 13 and the outer cylinder 16, a silicone ring 23 is provided for sealing. This silicone ring causes, apart from the already described air flow through which heat is dissipated, the interior space 24 is sealed off to the outside. In particular, this protects the diode from dirt and moisture.

Optionally, the reflector 11 can be releasably clamped by means of an annular holder with the outer cylinder 16.

Fig. 8 shows a schematic representation of a profile 25, with which a division into different chambers 26, 27 and 28, which extend over the overall height of the hollow body 10, broken down. In the chamber 26, for example, an LED driver is arranged, whereas the chambers 27 and 28 are provided for corresponding air upward and downward flows. In this respect, the profile of FIG. 8 deviates from the illustrations in FIGS. 1 to 3.

An essential feature of the present invention is the displaceable arrangement of the Fresnel lens, which is movable relative to the LED, so that different distances can be set, which produce different and each adapted to the needs radiation characteristics. In particular, the lamp can be used for targeted work table or dining table illumination as well as in other suspension, d. H. with different distance to the surface to be illuminated for room illumination (the latter optionally in combination with several lamps that form a lighting system).

The radiation emitted by the light-emitting diode 14 hits in part on the Fresnel Fresnel lens 12, where, with the exception of the vertically incident light beams is broken. The light rays exiting sideways over the tubular body part 13 are reflected on the inside of the reflector 11.

The present lamp is designed as a hanging lamp, but can also be realized as a wall lamp or obliquely arranged in space emitters, which is attached to a corresponding holder. In the case of upward radiation, the air supply and air discharge must be changed accordingly, so that resulting hot air can flow upwards.

Claims

claims

1. Lamp having a light source, which is preferably a light emitting diode 14, which is surrounded by a reflector (11) which has the shape of a cone or an ellipsoid of revolution and an auxiliary lens (12), d a d u c h e c e n e c e n e, d a s s

the front lens (12) is designed as a Fresnel lens, which is arranged within the envelope surface of the reflector (11) and relative to the light source (14) is displaceable.

2. Lamp according to claim 1, characterized in that the reflector (11) and the Fresnel lens (12) are integrally connected to each other.

3. Lamp according to claim 2, characterized in that the Fresnel lens (12) end of a tubular body part (13) is arranged, which is also formed as a guide for a linear displacement.

4. Lamp according to one of claims 1 to 3, characterized in that the reflector (11) consists of polycarbonate.

5. Lamp according to one of claims 1 to 4, characterized in that the light-emitting diode (14) is arranged in a closed up to the ventilation ducts space (24) whose walls through the tubular body part (13) on the one hand and through the circuit board, on the other hand, they are formed.

6. Lamp according to one of claims 1 to 5, characterized in that it is arranged light emitting diode in a housing designed as a hollow cylinder, which has a plurality of segment-like substantially over the entire height extending chambers, which allow a chimney effect-like air flow.

7. Lamp according to claim 6, characterized in that an LED driver is arranged in one of the air-flow chambers.