• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a luminaire for emitting an electromagnetic radiation, which has a first LED radiation source (1) for generating a first portion of the radiation in the form of a white light. Furthermore, the luminaire has a second LED radiation source (2) for generating a second portion of the radiation, the second portion having only radiation having wavelengths within the wavelength range from about 280 nm to about 425 nm. The second component makes it possible, in particular, for optical brighteners, as they occur, for example, in white products, to be able to exert their effect, at least significantly better, so that subsequently the product appears in a "purer" white.
    公开号:AT14081U1
    申请号:TGM414/2013U
    申请日:2013-12-04
    公开日:2015-04-15
    发明作者:Anja Frohnapfel
    申请人:Zumtobel Lighting Gmbh；
    IPC主号:
    专利说明:

    description
    LED WHITE LIGHT LIGHT
    The invention relates to a luminaire for emitting an electromagnetic radiation with an LED radiation source (LED: light emitting diode) for generating a white light.
    Such a lamp in the form of an LED spotlight is known from the prior art. When such an LED spotlight is used to illuminate white products, it may happen that the white does not appear "pure" white, but has a light color cast, such as a slight yellow tinge. This phenomenon typically occurs when the LED spotlight is used to illuminate white fabrics, white paper, and the like.
    The reason for this is that optical brighteners, such as those in white textiles, papers, plastics u. a. may be present at the irradiation with the light of the LED spotlight or at least only very limited. For their effect, optical brighteners require electromagnetic radiation from a wavelength range of approximately between 280 nm and 425 nm, that is to say in particular also include the UV range. (The transition from the ultraviolet radiation to the visible region is about 380 nm.) The usual LED light sources contain virtually no UV component, so that they can hardly excite optical brightener and in this way the effect described above is caused.
    For further illustration of the underlying relationships, a diagram is shown in Fig. 3, in which the abscissa on the wavelength λ of the electromagnetic radiation is plotted. The absorption spectrum of a typical brightener is outlined by a curve K1. This spectrum extends approximately to a wavelength of about 425 nm and has a maximum at about 375 nm. Furthermore, a further curve K2 is shown, which shows the corresponding emission spectrum of the brightener. The reason for this shift in the spectrum is fluorescence. The emitted spectrum has a maximum at about 437nm and corresponds predominantly to a violet-blue light. This emission spectrum therefore increases the blue component of the radiation emanating from the correspondingly irradiated white product. This finally achieves the effect that the white "pure" or. less yellowish appears. In the following, this effect is also referred to as "excitation" of the optical brightener.
    The invention has for its object to provide a corresponding improved light. In particular, the luminaire should be particularly suitable for illuminating white objects.
    This object is achieved according to the invention with the object mentioned in the independent claim. Particular embodiments of the invention are specified in the dependent claims.
    According to the invention, light is provided for emitting an electromagnetic radiation having a first LED radiation source for generating a first portion of the radiation in the form of a white light. Furthermore, the luminaire has a second LED radiation source for generating a second portion of the radiation, wherein the second portion only comprises radiation with wavelengths within the wavelength range from about 280 nm to about 425 nm.
    The second component makes it possible, in particular, that optical brighteners, as can be found, for example, in white products, can have their effect at least significantly better, so that, as a consequence, the product appears in a "purer" white.
    Preferably, the lamp is designed such that the electromagnetic radiation to the radiation of the lamp is configured, composed only of the first portion and the zweit¬ten share. In this way, the ratio between the two shares mentioned can be set very well.
    Preferably, the second portion only comprises radiation having wavelengths within the wavelength range of about 280 nm to about 400 nm, more preferably from about 280 nm to about 380 nm. For example, the second portion may be between about 370 nm and about 380 nm. Since the absorption maximum of optical brightener is in this range, an excitation of the optical brightener can be achieved particularly energetically particularly advantageous in this way. In addition, it is achieved in this way that the light emitted by the luminaire as a whole is virtually not impaired in its color appearance by the second component. In this case, the "color locus" of the light emitted by the luminaire undergoes virtually no "color shift" as a result of the second component, viewed on a standard color chart. In practice, LEDs are currently preferred which emit light with a wavelength of about 385 nm. Such LEDs are readily available and can accordingly be used inexpensively for the purposes of the present invention.
    Preferably, the lamp further comprises a control unit for driving the first LED radiation source and the second LED radiation source, wherein the control unit is designed such that the intensity of the first portion is greater than zero, when the intensity of the second portion is greater than zero ,
    If the first portion is greater than zero, light is emitted from the lamp; this generally results in an observer of the luminaire not looking directly into the light emitting area of the luminaire because of the associated glare. Therefore, the risk of UV damage to the eyes of the observer can be reduced if the control unit is designed such that UV radiation is emitted from the luminaire only when it also emits light.
    In this case, the control unit is preferably further designed such that the intensity of the second portion can assume at most a maximum value, which is dependent on the intensity of the first portion, in particular proportional to the latter. As the intensity of the light emitted by the luminaire increases, the likelihood that a viewer is looking directly into the luminaire decreases. Since the risk of possible eye damage increases with the intensity of the UV radiation, the risk of damage to the eyes of the observer by UV radiation is therefore further reduced by this embodiment of the control unit. The maximum value is chosen in particular such that the upper limit for the UV component specified in the corresponding standard for the so-called photobiological safety of lamps and lamp systems is not exceeded.
    Further preferably, the control unit is designed such that the intensity of the second portion is adjustable up to the maximum value, preferably at constant gehalte¬ner intensity of the first portion. This adjustment makes it possible to achieve that the light can be operated with a more or less intense second proportion or UV proportion, given a certain light output. If the LED light is used, for example, for illuminating colored objects, it is generally advantageous to control the second part down, that is to say to reduce the intensity of the second part.
    In this way it is possible to avoid or at least reduce a possible color distortion on irradiation or illumination of colored surfaces due to the second portion. Thus, the lamp is on the one hand particularly well suited for the irradiation of white objects, on the other hand, but also for the irradiation of colored objects.
    Preferably, the lamp is designed so that the intensity of the second portion is infinitely adjustable up to the maximum value, for example by means of a potentiometer. In this way, it is possible to achieve corresponding transitional conditions virtually as exactly as desired, and as an alternative, an adjustment of the second component in steps would also be conceivable.
    Preferably, the control unit is further designed such that the intensity of the second portion is adjustable to the value zero or can be turned off. As a result, the luminaire is also particularly suitable for the irradiation of colored surfaces.
    Preferably, the luminaire further comprises at least one optical element for influencing a radiation emitted by the first LED radiation source and the second LED radiation source, the at least one optical element having a transmittance with respect to the spectrum of the second component at least 60%, preferably at least 70%. In this way, an influencing of the radiation emitted by the light can be achieved without the second component being significantly weakened by the at least one optical element.
    When the lamp is designed in the form of a spotlight, it is particularly suitable for the illumination of products in shops and the like.
    The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. 1 shows a perspective sketch of an LED luminaire according to the invention, FIG. 2 shows a schematic sketch of a circuit board of the luminaire with the first LED radiation source and second LED radiation source arranged thereon, and FIG. 3 shows a diagram of the absorption and emission behavior of an optical Aufhel¬ lers.
    Fig. 1 shows - partially cut - schematically an LED lamp according to the invention in the form of an LED spotlight. The LED lamp - hereinafter also referred to as luminaire for short - is designed for the emission of electromagnetic radiation.
    The luminaire preferably comprises at least one circuit board 3, as again shown schematically in FIG. 2 in separated form.
    The luminaire has a first LED radiation source 1 for generating a first portion L of the electromagnetic radiation, to the radiation of which the luminaire is designed. The first part L is a white light. As indicated by way of example in FIG. 2, the first LED radiation source 1 may comprise a plurality of individual LEDs or consist of the latter. These LEDs of the first LED radiation source 1 can be white light LEDs known per se, for example LEDs that generate blue light, which is subsequently partly converted into yellow light by a color conversion material, so that the total white-appearing Light is emitted and / or RGB LEDs.
    Furthermore, the lamp has a second LED radiation source 2 for generating a second portion UV of the radiation to the radiation of the lamp is designed. The second component UV comprises exclusively radiation with wavelengths within the wavelength range of about 280 nm to about 425 nm. The second component UV can consist in particular of radiation which lies only in the ultraviolet range of the radiation, in particular in the wavelength interval of about 280 nm to about 380 nm. The reference UV for the second portion is chosen to recall this relationship. By "about" is meant in connexion with a wavelength specification a small wavelength range, which may mean, for example, ± 20 nm or ± 30 nm.
    When the LED lamp illuminates a white article having an optical brightener, the latter emits blue light, rendering the article particularly pure white.
    Preferably, the lamp is designed such that the electromagnetic radiation, the radiation is designed to the lamp, composed only of the first portion L and the second portion UV.
    Preferably, the second portion UV only comprises radiation having wavelengths within the wavelength range from about 280 nm to about 400 nm, more preferably from about 280 nm to about 380 nm. For example, the second portion may be between about 370 nm and about 380 nm. In particular, the second LED radiation source 2 may be designed such that the second component UV has a maximum at a wavelength which is in the range from 280 nm to 380 nm, particularly preferably in the range from 370 nm to 380 nm second LED radiation source 2 is designed to emit radiation having a wavelength spectrum having a maximum at about 375 nm, for example at 375 nm ± 15 nm, then, due to the absorption spectrum described at the outset, a typical brightener as shown in FIG is sketched - stimulate with relatively low intensity of the optical brightener, so that the lamp can be designed overall with particularly good efficacy.
    Moreover, it is advantageous if the wavelength maximum of the second component UV is below 400 nm, particularly preferably below 380 nm, because in this case the color location of the light emitted by the lamp is changed particularly little by the second component UV. However, as LEDs are currently primarily available which emit light having a wavelength of about 385 nm, these LEDs are currently being used for reasons of cost, even though the light of these LEDs is just outside the most preferred wavelength range.
    As indicated in Figures 1 and 2, it can be provided that the first LED radiation source 1 and the second LED radiation source 2 are arranged on the at least one board 4.
    The second LED radiation source 2 may, for example - as shown by way of example in FIG. 2 - comprise only one LED, but in general may also consist of several LEDs. Preferably, the second LED radiation source 2 consists of fewer LEDs than the first LED radiation source 1, because it usually suffices to excite the optical brightener when the second component UV is lower in comparison to the first component L.
    Preferably, the luminaire further comprises a control unit for driving the first LED radiation source 1 and the second LED radiation source 2, wherein the control unit is designed such that the intensity of the first component L is greater than zero, when the intensity of the second component UV is greater than zero. In this way, it is achieved that light is emitted from the luminaire, provided that it also emits UV radiation. When a viewer is looking at the light, he usually does not look directly into the light when it is emitting light. The control unit as described can preclude the viewer from looking at the light and not emitting light, but UV radiation. Thus, the danger of damage to the eyes of the observer by UV radiation is definitely reduced. practically impossible.
    In this case, the control unit is preferably further designed such that the intensity of the second component UV can assume at most a maximum value UVmax, which is dependent on the intensity of the first component L, in particular proportional to the latter. For example, a bypass circuit can serve this purpose. In this way, the danger of eye damage from UV radiation can be further reduced. The luminaire can thus be designed with particularly high photobiological safety or it can be ensured that the upper limit specified in the standard for photobiological safety of lamps and lamp systems is by no means exceeded.
    Accordingly, the lamp is advantageously designed so that it has a Lichtabgabeflä¬che over which both the first portion L, and the second portion UV of radiation is delivered. In this case, a particularly advantageous configuration is made possible if the first LED radiation source 1 and the second radiation source 2 are arranged adjacent to one another on the at least one circuit board 3. In particular, it can be provided, as is apparent from FIG. 2 by way of example, that the second LED radiation source 2 is surrounded in a ring shape by the first LED radiation source 2.
    Preferably, the luminaire further comprises at least one optical element 4 for influencing the radiation emitted by the two LED radiation sources 1, 2. For example, the at least one optical element 4 may comprise a lens 41 and / or a reflector 42. Preferably, the at least one optical element 4 is designed so that it is permeable to at least 60%, particularly preferably at least 70%, with respect to the spectrum of the second component UV. This is advantageous with respect to the effect energy that is of interest here. Accordingly, for example, the lens 41 may have a Transmissi¬onsgrad for the second portion UV, which is greater than 60%, preferably greater than 70%.
    In the example shown, the lens 41 is designed as a primary optic element and the reflector 42 as a secondary optic element. The reflector 42 is shaped in a first approximation cone-shaped section and through the thus formed larger opening the light-emitting surface of the light is fixed.
    Further preferably, the luminaire is designed such that the first component L generated by the first LED radiation source 1 and the second component UV generated by the second LED radiation source 2 only pass through the at least one optical element 4 before it emits the light leave the outside. This makes it possible to avoid a further weakening of the second UV component.
    Further preferably, the control unit is designed such that the intensity of the second portion UV is adjustable up to the maximum value UVmax, preferably at constant held intensity of the first portion L. In particular, the light can be designed so that the intensity of the second component UV is infinitely adjustable up to the maximum value UVmax, for example with the aid of a potentiometer 5, whereby, of course, a change in the UV component in small steps would also be conceivable. Advantageously, the Leuchteso designed that the potentiometer 5 can be adjusted on the lamp from the outside, as beispielsweise a corresponding knob outside the housing of the lamp is arranged, as indicated in Fig. 1 by way of example.
    In this way, the intensity of the second portion UV can be reduced, for example, reduced to zero, which can be achieved in particular that when illuminating colored objects by the second portion UV, the colors are not distorted.Somit is suitable the light on the one hand for the irradiation or illumination of white objects, on the other hand, but also for the irradiation of colored objects. Accordingly, the design is further preferably such that the intensity of the second portion UV can be adjusted to zero. As a result, the luminaire is also particularly suitable for the irradiation of colored surfaces.
    权利要求:
    Claims (10)
    [1]
    Claims 1. A luminaire for emitting an electromagnetic radiation, comprising - a first LED radiation source (1) for generating a first portion (L) of the radiation in the form of a white light, characterized by - a second LED radiation source (2) for generating a second portion (UV) of the radiation, the second portion (UV) having only radiation having wavelengths within the wavelength range of about 280 nm to about 425 nm,
    [2]
    2. Luminaire according to claim 1, which is designed such that the electromagnetic radiation to whose emission the light is designed, composed only of the first portion (L) and the second portion (UV).
    [3]
    3. Luminaire according to claim 1 or 2, wherein the second portion (UV) only radiation having wavelengths within the wavelength range of about 280 nm to about 400 nm, preferably from about 280 nm to about 380 nm.
    [4]
    4. The light according to claim 1, further comprising a control unit for driving the first LED radiation source and the second LED radiation source, wherein the control unit is designed in such a way that the intensity of the first component is greater than Zero is when the intensity of the second component (UV) is greater than zero.
    [5]
    5. Lamp according to claim 4, wherein the control unit is designed such that the intensity of the second portion (UV) can take at most a maximum value (UVmax), which is dependent on the intensity of the first portion (L), in particular proportional to the latter ,
    [6]
    6. Luminaire according to claim 5, wherein the control unit is further configured such that the intensity of the second component (UV) is adjustable up to the maximum value (UVmax), preferably at constant maintained intensity of the first component (L). ,
    [7]
    7. Lamp according to claim 6, wherein the intensity of the second portion (UV) up to the maximum value (UVmax) is infinitely adjustable, for example by means of a potentiometer.
    [8]
    8. Luminaire according to one of claims 4 to 7, wherein the control unit is further designed such that the intensity of the second An¬teils (UV) is adjustable to the value zero or can be turned off.
    [9]
    9. Luminaire according to one of the preceding claims, further comprising - at least one optical element (4) for influencing one of the first LED radiation source (1) and the second LED radiation source (2) emitted radiation, wherein the at least one optical element ( 4) has a transmittance with respect to the spectrum of the second portion (UV) which is at least 60%, preferably at least 70%.
    [10]
    10. Luminaire according to one of the preceding claims, in the form of a radiator. For this 3 sheets of drawings
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    法律状态:
    2017-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20161231 |
    优先权:
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