JP6500940B2 - Lighting system for electric chrysanthemum - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a lighting device used when cultivating a Japanese chrysanthemum.

  Since chrysanthemums used for display in various events usually flower in the fall, a chrysanthemum grown by artificially growing chrysanthemums at any given time is used for such applications. For the flowering characteristics of chrysanthemums, the choice of the light is very important, as the light has a significant impact. On the other hand, not only for illumination chrysanthemums, as lighting devices, those using light emitting diodes (LEDs) instead of conventionally used incandescent bulbs are preferably used from the viewpoint of durability and low power consumption. It is done.

  Unlike incandescent bulbs, in particular in the case of LEDs, the wavelength at which the spectrum peaks can be set by selecting the material or the like. For this reason, according to this setting, various characteristics can be adjusted in the cultivation of electric chrysanthemum. By adjusting this characteristic, it is possible to set the flowering flower to be uniformly large when the chrysanthemum is actually displayed. Patent Document 1 describes such an example.

  In the technology described in Patent Document 1, when red light (wavelength 600 to 700 nm) is irradiated to red light (wavelength 600 to 700 nm) in cultivation of electric light chrysanthemum, main stem elongation is suppressed when the light intensity is high. At the same time, it is described that flower bud differentiation / flowering is promoted, and when the light intensity is low, it has an effect of suppressing main stem elongation and also flower bud differentiation / flowering. Moreover, when blue light (wavelength 400-500 nm) is irradiated, it is also described that it is effective in promoting main stem elongation and flower bud differentiation / flowering. For this reason, it has been shown that it is effective to sequentially perform high-intensity infrared light irradiation, secondly low-intensity infrared light irradiation, and thirdly blue light irradiation sequentially during cultivation. .

JP, 2008-142005, A

  In the technique described in Patent Document 1, electric chrysanthemum is grown indoors under a light environment in which the spectrum and light intensity are controlled as described above. Here, although the spectrum and the light intensity as described above are suitable for the required characteristics of the illuminated chrysanthemum, it is not preferable for a worker (human) who works in this room. That is, in such a light environment, it is difficult to visually check the illumination chrysanthemum and various structures, and it has become difficult to work. These problems are particularly significant when low intensity infrared light irradiation is performed. For this reason, the lighting suitable for cultivation of electric chrysanthemum and which becomes easy for the worker at the time of cultivation to work was desired.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an invention for solving the problems.

The present invention has the following configuration in order to solve the above-mentioned problems.
In the illumination device for electric illumination chrysanthemum of the present invention, the integral intensity of the region of wavelength 650 to 700 nm is 1, and the integral intensity of the region of wavelength 500 to 600 nm is 0.7 to 0.8, in the spectrum It is characterized in that the maximum intensity in the region of wavelength 500 to 600 nm emits illumination light set lower than the maximum intensity in the region of wavelength 650 to 700 nm.
In the illumination device for electric illumination chrysanthemum according to the present invention, in the spectrum of the illumination light, the integral intensity in the wavelength region of 650 to 700 nm is 1, the integral intensity in the wavelength region of 380 to 450 nm, and the wavelength of 700 to 750 nm The integrated intensity in the region is characterized by being 0.1 or less.
In the illumination device for electric illumination chrysanthemum according to the present invention, in the spectrum of the illumination light, assuming that the integrated intensity in the region of wavelength 650 to 700 nm is 1, the integrated intensity in the region of wavelength 620 to 640 nm is 0.3 to 0.4 It is characterized by being in the range of
The illumination device for electric illumination chrysanthemum according to the present invention is characterized in that, in the spectrum of the illumination light, a peak intensity in a wavelength range of 380 nm to 750 nm is obtained in a wavelength range of 650 to 700 nm.
The illumination device for electric illumination chrysanthemum according to the present invention comprises: a first light source comprising a semiconductor and a first light emitting diode emitting light with a peak wavelength of emission intensity in the range of 649 to 668 nm; A second light emitting diode that emits light having a shorter peak wavelength than the first light emitting diode, and a phosphor that absorbs light emitted by the second light emitting diode and emits fluorescence, and is a peak of light emission intensity A second light source emitting light having a wavelength in the range of 590 to 610 nm is used in combination.
The lighting device for an illumination of the present invention is characterized in that the first light source and the second light source are alternately arranged side by side.

  Since this invention is comprised as mentioned above, it is suitable for the cultivation of an illumination chrysanthemum, and can obtain the illumination which becomes easy for the worker at the time of cultivation to work.

It is a figure which shows an example of the spectrum by illumination using white LED, and four wavelength ranges which have influence with respect to rearing of a chrysanthemum. It is a figure which shows an example of the spectrum by the illumination which used the incandescent lamp, and four wavelength ranges which have influence with respect to rearing of a chrysanthemum. It is an example of the light spectrum of the 1st light source used in the illumination for illumination light according to an embodiment of the present invention. It is an example of the emission spectrum of the 2nd light source used in the illumination for illumination lamps according to the embodiment of the present invention. It is an example of the emission spectrum of the illumination for illumination lamps according to the embodiment of the present invention. It is a figure which shows an example of a structure of the illumination for illumination light according to the embodiment of the present invention.

  Hereinafter, a lighting device for an illumination chrysanthemum according to an embodiment of the present invention will be described. The spectrum of this electric light chrysanthemum illumination device is set in consideration of the characteristics of the electric light chrysanthemum (chrysanthemum) described below.

  The influence of the wavelength of light on the growth of plants is reported, for example, by the Ministry of Education, Culture, Sports, Science and Technology, Science and Technology Council, and the Resource Research Subcommittee Report (2. Light and Plants-Plant Factory) September 5, 2007 (September 6, 2007) 5th month search), http: // www. mext. go. jp / b_menu / shingi / gijyutu / gijyutu3 / toushin / 07091111. It is described in htm. In addition, particularly for Densho Chrysanthemum (chrysanthemum), “Manual for adjusting flowering of chrysanthemum using LED” (Aichi Prefectural General Agricultural Research Station issued June 2013), http: // www. pref. aichi. jp / nososi / seika / gijutujohou / siryou / LEDkikumanual. It is described in pdf.

  In FIG. 1, an example of a spectrum of white LED illumination (color temperature: 5000 K) combining blue LED and phosphor, and four wavelength ranges (first range: 380 to 450 nm, second range) therein 620-640 nm, 3rd area | region: 650-700 nm, 4th area | region: 700-750 nm) is shown. The light in the first region corresponds to blue light and promotes the formation of chrysanthemum flower buds as described in US Pat. Conversely, light in the second region suppresses flower bud differentiation. The light of the third region corresponds to red light and promotes main stem elongation. The light in the fourth region suppresses sprouting differentiation. Here, in Patent Document 1, as described above, the change of the characteristic according to the light intensity of the light of wavelength 600 to 700 nm is described, but here, the second of the above in the wavelength of 600 to 700 nm is described. The characteristics of the region (wavelength 620 to 640 nm) and the third region (wavelength 650 to 700 nm) are further detailed.

  In the cultivation of electric chrysanthemum, it is required to suppress flowering and to flower immediately after shipment (during display) while promoting germination and elongation of the main stem to grow the whole greatly during cultivation. . In this point, when the light of the white LED shown in FIG. 1 is irradiated to the illumination chrysanthemum, the light intensities of the first to third regions do not differ significantly, and the light intensity of the fourth region is not Lower than these. For this reason, since the sprouting is not suppressed by the light of the fourth region, and the main stem elongation is promoted by the light of the third region, the growth of the main stem and the like is promoted. On the other hand, with regard to flower bud differentiation, the light of the first region and the light of the third region have opposite effects, and consequently neither effect can be obtained with respect to flower buds (flowering).

  Also, FIG. 2 similarly shows an example of the spectrum of an incandescent lamp. In this case, although the light intensity of the first region is particularly low, the light intensities of the second to fourth regions are all high, and the light intensity of the fourth region is particularly high. Therefore, although the formation of flower buds is suppressed, the effect on growth other than flower buds such as main stem elongation can not be obtained. For this reason, neither the illumination light of FIG. 1 (white LED) nor FIG. 2 (incandescent light bulb) is suitable for the cultivation of electric chrysanthemum.

  During cultivation, it is particularly preferable to irradiate the light (red mouth) of the third region that promotes main stem elongation. For this reason, in the lighting device for an illumination according to an embodiment of the present invention, the light of the first component having a sharp peak in the spectrum is used so that the light of the third region has the highest intensity. . As the light of the first component having such a sharp peak, one using an LED that emits red light as a light source can be preferably used.

  On the other hand, since the light of the first component is red light, it is not suitable as illumination light under the working environment of the worker at the time of cultivation. As illumination light under the working environment, light which is in the middle between red and blue and has a broad spectrum (close to white light) is particularly preferable. For this reason, in the illumination device for an illumination chrysanthemum according to the embodiment of the present invention, light of a second component having a spectrum whose wavelength is expanded at about 500 to 600 nm is used. This wavelength region is between the first region and the second region, and this component has no significant effect on flower bud differentiation and main stem growth during chrysanthemum growth. However, in the case where the spectrum having such a large spread is given, the corresponding intensity can be given also in the second region (wavelength: 620 to 640 nm) which suppresses flower bud differentiation. Thus, as the light of the second component, it is possible to use light having a spectrum that spreads to a wavelength of about 500 to 640 nm including the above-mentioned second region in the tail portion in the spread of the spectrum. A light source in which an LED and a phosphor are combined can be used as the light of the second component.

  Therefore, by combining the light of the first component and the light of the second component, the main stem is grown while suppressing the differentiation of flower buds during cultivation, and the illumination light is also easy for workers to work with You can get

  Below, the structure of the illuminating device for electric illumination mum used as the light source which emits said illumination light is demonstrated concretely. First, as the first light source for emitting the first component, it is possible to use a light emitting diode (first light emitting diode) in which the light emitting layer is made of an AlGaInP-based semiconductor. FIG. 3 shows an example of the emission spectrum of this first light source. Here, the peak intensity is normalized to 1. Here, since a phosphor is not used and light is emitted from the above semiconductor layer, the peak of this wavelength becomes quasi-monochromatic light corresponding to the band gap of the above semiconductor. This peak wavelength is at 649-668 nm and corresponds to red light. Therefore, a red LED can be used as the first light source.

  As the second light source for emitting the second component, a combination of a light emitting diode (second light emitting diode) in which a light emitting layer is formed of an InGaN-based semiconductor layer and a phosphor can be used. The light emitted by the second light emitting diode is blue quasi-monochromatic light. On the other hand, the phosphor is made of a material that absorbs this blue light and emits yellow light. Here, if the phosphor is sufficiently thickened to absorb most of the blue light, it is possible to obtain a spectrum that reflects the light emitted by the phosphor having a spread in the vicinity of yellow. FIG. 4 shows an example of the emission spectrum of this second light source. Here too, the peak intensity is normalized to 1. For example, similarly, in the spectrum shown in FIG. 1 when the light emitting diode and the phosphor are used, the phosphor absorbs light emitted from the light emitting diode and emits light having a longer wavelength than this. On the short wavelength side of the spectrum, a peak corresponding to the blue light emitted by the light emitting diode is seen. On the other hand, in the spectrum of FIG. 4, such a short wavelength side is used so that the light emitted from the second light emitting diode is not sufficiently absorbed by the phosphor and emitted outward. It is possible not to generate the peak of By using the phosphor in this manner, the spectral spread can be made wider than the quasi-monochromatic first light source. The peak wavelength of the second component is in the range of 590 to 610 nm, and a yellow LED having such a configuration can be used as the second light source. The spread of the spectrum in FIG. 4 can be adjusted by the composition of the phosphor and the like.

  The illumination light is obtained by mixing the light emitted by the first light source and the light emitted by the second light source. FIG. 5 shows the spectrum of this illumination light. In this spectrum, as described above, the first component has an overall peak in the third region, and the second component causes the component itself to have a low intensity but spread on a shorter wavelength side than this peak. Exists. In addition, by using the second light source as described above, it is possible to prevent generation of a peak on the short wavelength side. Therefore, the intensity on the short wavelength side of yellow can be sufficiently reduced.

  In this illumination light, assuming that the integral intensity in the wavelength range of 650 to 700 nm corresponding to the third region is 1, the integral intensity in the wavelength range of 500 to 600 nm mainly attributed to the second component is 0. The peak intensity in the wavelength range of 500 to 600 nm is set smaller than the peak intensity in the wavelength range of 650 to 700 nm.

  Further, assuming that the integral intensity in the wavelength region of 650 to 700 nm is 1, the integral intensity at a wavelength of 380 to 450 nm corresponding to the first region and the integral intensity at a wavelength of 700 to 750 nm corresponding to the fourth region Are both less than or equal to 0.1. As mentioned above, this lowering of the integrated intensity at a wavelength of 380-450 nm is achieved in particular by setting the second light source as described above, and the integrated intensity at a wavelength of 700-750 nm is thus low. This is achieved in particular by setting the first light source as described above. While this suppresses the formation of flower buds by the components of the first region, it does not suppress the germination by the components of the fourth region.

  The second region (wavelength: 620 to 640 nm) that suppresses flower bud differentiation is near the boundary between the wavelength region where the first component is dominant and the wavelength region where the second component is dominant, and its integrated intensity Is set to 0.3 to 0.4. This point is realized by broadening the spectrum in the second component as described above. By setting the integrated intensity of this region in this range, it is possible to suppress flower bud differentiation.

  FIG. 6 is a diagram showing the configuration of the illumination device 1 for illumination. Here, since the first light source 11 and the second light source 12 are alternately arranged, the light emitted by both is uniformly mixed to become the above-mentioned illumination light. The red LED as the first light source 11 and the yellow LED as the second light source 12 are mixed at a ratio of 6: 8. In each column in the vertical direction in the figure, the first light sources 11 and the second light sources 12 are alternately arranged at six and eight positions, respectively, except for the end. Both the first light source 11 and the second light source 12 are driven by passing a current between the anode and the cathode where light emitting diodes are used, but the first light source 11 and the second light source 12 in each row are in series Each anode and each cathode may be connected to be connected. In this case, after each row is configured in this way, each row is connected in parallel and DC power is applied so that each first light source 11 and each second light source 12 emit light. The above-mentioned illumination light can be emitted uniformly. Such a configuration is particularly preferable in obtaining illumination light which uniformly illuminates the planted chrysanthemum in a wide range.

  Although the first light source 11 and the second light source 12 are two-dimensionally arranged in the configuration of FIG. 6, these may be alternately one-dimensionally arranged. Whether each light source is used as a two-dimensional array or a one-dimensional array can be selected depending on the construction of the cultivation facility or the like.

  Thus, the illumination device having the configuration of FIG. 6 can emit illumination light having the spectrum of FIG. As described above, in this case, since both the first light source 11 and the second light source 12 can use light emitting diodes, they operate at a lower voltage than the incandescent light bulb (FIG. 2). Low power consumption and long life. Further, as shown in FIG. 6, it can be easily formed as a surface light source.

  However, as long as a spectrum as shown in FIG. 5 can be realized, it is clear that using a light source other than a light emitting diode is effective in cultivating a chrysanthemum. That is, the illumination device for the illumination lamp described above is not limited to one using a light emitting diode.

DESCRIPTION OF SYMBOLS 1 Lighting device 11 for 1st light source 12 2nd light source

Claims (6)

A lighting device for electric chrysanthemum,
In the spectrum
Assuming that the integrated intensity in the wavelength region of 650 to 700 nm is 1,
The integrated intensity in the wavelength range of 500 to 600 nm is 0.7 to 0.8,
An illumination device for an illumination chrysanthemum, which emits illumination light whose maximum intensity in the region of 500 to 600 nm is set lower than the maximum intensity in the region of 650 to 700 nm. In the spectrum of the illumination light,
Assuming that the integrated intensity in the wavelength region of 650 to 700 nm is 1,
The integrated intensity in the wavelength range of 380 to 450 nm and the integrated intensity in the wavelength range of 700 to 750 nm are 0.1 or less. In the spectrum of the illumination light,
Assuming that the integrated intensity in the wavelength region of 650 to 700 nm is 1,
The integrated intensity of the area | region of a wavelength of 620-640 nm is a range of 0.3-0.4, The illuminating device for electric lighting chrysanthemums of Claim 2 characterized by the above-mentioned. In the spectrum of the illumination light,
The illumination according to any one of claims 1 to 3, wherein the peak intensity in the wavelength range of 380 nm to 750 nm is obtained in the wavelength range of 650 to 700 nm. apparatus. A first light source using a first light emitting diode which is made of a semiconductor and emits light with a peak wavelength of light emission intensity in the range of 649 to 668 nm;
A second light emitting diode that is made of a semiconductor and emits light having a peak wavelength shorter than that of the first light emitting diode and a phosphor that emits light by absorbing light emitted from the second light emitting diode are combined to emit light. A second light source emitting light having a peak wavelength of intensity in the range of 590 to 610 nm;
The lighting device for an illumination chrysanthemum according to any one of claims 1 to 4, characterized in that it is used in combination.   The illumination device according to claim 5, wherein the first light source and the second light source are alternately arranged.