JP2008022711A - Lighting apparatus for plant growth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong a flowering period when flowers are in bloom in a lighting apparatus for plant growth. <P>SOLUTION: The lighting apparatus for plant growth is equipped with a light source part 3 for irradiating a plant 1 with light. The light irradiated from the light source part 3 is made to have the ratio of energy contained in light at wavelength of 450-500nm to that contained in light at wavelength of 300-800nm of ≥45%. Consequently, the plant 1 irradiated with such light is controlled in growth and is slow in flowering of bud and aging of flower in bloom is controlled. As a result, flowers are in bloom for a long period of time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plant-growing lighting device that irradiates light to a plant in order to control the growth of the plant.

  As a conventional plant-growing lighting device, a plant-growing fluorescent lamp in which the wavelength component of light applied to a plant is controlled is known (for example, see Patent Document 1). In this fluorescent lamp for plant growth, the intensity ratio of light energy in the range of the emission wavelength of 450 to 700 nm is 30 to 63% when it is less than 450 to 500 nm, 10 to 20% when it is less than 500 to 600 nm, and 24 to 600 when it is 600 to 700 nm. The blue component ratio in the blue component (less than 450 to 500 nm) and the red component (600 to 700 nm) is 0.37 to 0.70. According to this fluorescent lamp for plant growth, it is possible to grow a plant in which vitamin C and the fresh weight of the above-ground part are balanced.

Similarly to the above-described fluorescent lamp for plant growth, as a lighting device in which the wavelength component of the emitted light is controlled, a plurality of fluorescent lamps arranged inside the casing, and the respective light emission outputs and light emission of these fluorescent lamps There is known a dimming illumination device including a dimming unit for setting time (see, for example, Patent Document 2). In this dimming illumination device, each of the fluorescent lamps generates light in which the amount of light is concentrated in one of the wavelength bands obtained by dividing the wavelength region of light including almost the entire visible light region into at least two. For this reason, since the light emission output in each wavelength band is variable, according to the present apparatus, it is possible to easily carry out the investigation of the plant growth state performed by changing the wavelength and illuminance of light.
JP 2002-360067 A Japanese Patent Laid-Open No. 10-22

  By the way, when a person grows a plant indoors or wishes to maintain a flowering state for viewing, the light irradiated to the plant from the plant growing lighting device is inappropriate. In addition, it is undesirable for plants to die in a short period of time. On the other hand, it is also undesirable for the plant to grow too vigorously. In particular, flower buds are purchased when the flowers are buds, and the viewers appreciate the flowers that gradually bloom over time, so when sunlight is actively irradiated or artificial light It is not desirable that the growth of the plant is promoted when supplementary light is applied, thereby promoting flowering, leading to early flowering time and shortening the flowering period. This is because the period during which the viewer can appreciate the bloomed flowers is shortened. Therefore, it is desirable to grow plants so as to keep the flowers in bloom for a long period of time. However, the technique described in Patent Document 1 or Patent Document 2 cannot extend the flowering period in which flowers are blooming.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a plant-growing lighting device that can lengthen the flowering period in which flowers are blooming.

  In order to achieve the above object, the invention of claim 1 is directed to a plant growth lighting device comprising an irradiation means for controlling the irradiation of light to a plant in order to adjust the growth of the plant. The wavelength component is controlled so that the ratio of the energy contained in light in the wavelength region of 450 to 500 nm to the energy contained in light in the wavelength region of 300 to 800 nm is 45% or more. .

  According to a second aspect of the present invention, in the plant-growing lighting device according to the first aspect, the height of the growth point in the vicinity of the top of the plant is assumed to be parallel to the ground, and the area thereof is viewed from above. In an imaginary plane that is substantially the same as the size of the plant at the time, the average illuminance on the horizontal plane is 1000 lux or more.

  A third aspect of the present invention is the lighting device for plant growth according to the first or second aspect, wherein the irradiating means has a wavelength of 450 to 500 nm of light irradiated when a person is viewing a plant. By reducing the amount of light in the region as compared to when the person is not appreciating the plant, the wavelength component is controlled so that the irradiated light looks almost white.

  According to the first aspect of the present invention, when the plant is irradiated with light having the energy ratio as described above, the growth of the plant is suppressed and the flowering of the cocoon occurs especially in an environment where almost no sunlight is inserted. Will also be late. Therefore, senescence is also suppressed in the flowering flower, and as a result, the flowering period in which the flower is in bloom can be lengthened.

  According to invention of Claim 2, the favorable growth state of a plant can be maintained for a long time.

  According to invention of Claim 3, when a person appreciates a plant, the light suitable for viewing can be irradiated to a plant.

  A plant-growing lighting device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a plant-growing lighting device (hereinafter, this device) according to the present embodiment. The apparatus includes a plant mounting table 2 on which the plant 1 is mounted, and a light source unit 3 that irradiates the plant 1 with light in order to control the growth of the plant 1 mounted on the plant mounting table 2. The light source unit 3 is supported, and a lower part thereof includes a support wall 4 fixed to the plant mounting table 2, an operation unit 5 operated by a user to switch the mode of the apparatus, and a timer 6. . When the timer 6 has a light period in which the light source unit 3 is turned on and a dark period in which the light source unit 3 is turned off in one cycle, the timer 6 is operated to rotate the cycle once every 24 hours. Is to measure. The light source unit 3 is provided at a position above the plant 1 when the plant 1 is mounted on the plant mounting table 2.

  The mode of this apparatus consists of the growth control mode for controlling the growth of the plant and the viewing mode for producing the plant when the user views the plant, and is switched based on the operation of the operation unit 5 by the user. It is done. The operation unit 5 includes, for example, a switch, and the mode of the apparatus is switched according to a pressing operation of the switch by the user. In addition, the operation unit 5 includes a human sensor, and by using the human sensor, the presence / absence of a person in the vicinity of the apparatus is confirmed, and the mode of the apparatus is automatically switched to the viewing mode only while the person is in the vicinity. It does n’t matter. In this case, it is possible to save the user from having to operate the switch and the like.

  The light source unit 3 emits light whose wavelength component is controlled in accordance with the current mode of the apparatus. For example, the light source unit 3 emits substantially white light for plant production when the device is in the viewing mode, and with respect to the energy contained in the light in the wavelength region of 300 to 800 nm when the device is in the growth control mode. Light with a ratio of energy contained in light in the wavelength region of 450 to 500 nm being 45% or more is emitted. The effect of this light on the plant 1 will be described later. In addition, the light source part 3 which radiate | emits such light may be provided in the side of the plant. Further, the light source unit 3 may be supported by a support bar instead of the support wall 4.

  FIG. 2 shows the configuration of the light source unit 3. The light source unit 3 shown in the figure includes a light source support base 31 supported by a support wall 4, and a white light source 7 and a blue light source 8 attached to the same surface of the light source support base 31. The light emitted from the white light source 7 and the blue light source 8 is dimmed and controlled, and these light sources 7 and 8 have a wavelength of 450 to 500 nm with respect to the energy contained in the light in the wavelength range of 300 to 800 nm. The light in which the ratio of the energy contained in the light in the region is 45% or more is emitted.

  The number of white light sources 7 is, for example, one, and the white light source 7 is attached near the center of one surface of the light source support 31. The number of blue light sources 8 is, for example, four, and these blue light sources 8 are arranged on the outer circumference of a circle centering on the white light source 7 with an angle of approximately 90 degrees with each other. It is fixed. The white light source 7 arranged as described above is, for example, an incandescent bulb, a white fluorescent lamp, a white metal halide lamp, a mercury lamp, a white electrodeless lamp, a white light emitting diode (white LED), or an organic EL (Electro Electron) that emits white light. -Luminescence) and the like. The blue light source 8 includes, for example, a blue light bulb, a blue fluorescent lamp, a blue metal halide lamp, a blue electrodeless lamp, a blue light emitting diode (blue LED), or an organic EL that emits blue light. The arrangement and number of the white light source 7 and the blue light source 8 are not limited to the above.

  FIG. 3 shows the electrical configuration of the apparatus. This apparatus includes an operation unit 5 operated by a user to switch modes, a timer 6 for measuring time, a dimming lighting unit 7a for dimming lighting control of the white light source 7, and a dimming lighting control for the blue light source 8. And a control unit 9 that transmits a control signal to the dimming lighting units 7a and 8a in response to signals from the operation unit 5 and the timer 6. The parts 5, 7 a, 8 a, 9 and the timer 6 are accommodated in the plant mounting table 2, the light source support table 31 or the support wall 4. The timer 6 may be attached to the outer surface of the plant mounting table 2, the light source support table 31 or the support wall 4, or may be installed outside the main body including the plant mounting table 2, the light source support table 31 and the support wall 4. It may be. When installed externally, the timer 6 transmits time information to the control unit 9 via a transmission line such as a USB (Universal Serial Bus) cable.

  The dimming / lighting units 7a and 8a are composed of dimming / lighting circuits. The dimming / lighting circuits control the light emission amount of the white light source 7 or the blue light source 8 by increasing / decreasing the light sources 7a, 8a, respectively. / Performs extinction control. The light emission amount control and the on / off control are performed according to a control signal from the control unit 9. As described above, the white light source 7 and the blue light source 8 are included in the light source unit 3.

  The control unit 9 includes a microcomputer (hereinafter abbreviated as a microcomputer) including a CPU, and the microcomputer performs various controls of the white light source 7 and the blue light source 8 using the dimming lighting units 7a and 8a. Various controls of the white light source 7 and the blue light source 8 can be performed independently, and these controls are performed by transmitting a control signal corresponding to the control content to the dimming lighting units 7a and 8a. . The various controls described above include control of the amount of light emitted from the white light source 7 and the blue light source 8 for adjusting the growth of the plant.

  For example, when the user operates the operation unit 5 to switch the mode of the apparatus to the growth control mode / viewing mode, the control unit 9 determines whether the white light source 7 and the blue light source 8 are based on the signal from the operation unit 5. The amount of light emission is controlled by the dimming lighting units 7a and 8a, respectively. By controlling the amount of emitted light, in the growth control mode, the light emitted from the white light source 7 and the light emitted from the blue light source 8 are combined, that is, emitted from the entire light source unit 3 and applied to the plant. In the light, the wavelength component is controlled so that the ratio of the energy contained in the light in the wavelength region of 450 to 500 nm to the energy contained in the light in the wavelength region of 300 to 800 nm is 45% or more. On the other hand, in the viewing mode, the wavelength component is controlled so that the light emitted from the light source unit 3 to the plant 1 looks almost white. This wavelength component control for making the light substantially white is performed by, for example, two methods. One method is to reduce the amount of light in the wavelength region of 450 to 500 nm of the light emitted from the light source unit 3 as compared to when the user is not viewing the plant 1. For this reason, the light emission amount of the blue light source 8 is reduced. Another method is to increase the light emission amount of the white light source 7. Here, the time when the user is not appreciating the plant means that the mode of the apparatus is the growth control mode. As described above, the white light source 7, the blue light source 8, the dimming / lighting units 7a and 8a, and the control unit 9 form an illumination unit.

  Further, various controls performed by the control unit 9 include turning on / off control of the white light source 7 and the blue light source 8. This on / off control is performed based on the time information transmitted from the timer 6. For example, the control unit 9 grasps the current time by the timer 6 and turns off the white light source 7 and the blue light source 8 at a preset time at night. Similarly, the control unit 9 turns on the white light source 7 and the blue light source 8 at a preset time in the morning.

  According to the above configuration, this apparatus has a function of controlling the wavelength component so that the light emitted from the light source unit 3 looks almost white when a person appreciates the plant. Sometimes the plant 1 can be irradiated with light suitable for viewing. Further, the control unit 9 measures the time by the timer 6 and performs the light emission amount control and the light on / off control of the white light source 7 and the blue light source 8 according to the time, so that the user is at home every day. The plant 1 is irradiated with the light in the ornamental mode, the plant 1 is irradiated with the light in the growth control mode during the time when the user leaves the house, and the white light source 7 and the blue light source 8 are turned off at night. Thus, the plant 1 can be rested.

  Next, the horizontal illuminance of the light emitted from the light source unit 3 will be described with reference to FIGS. 4 (a) and 4 (b). Based on the control signal from the control unit 9, the dimming lighting units 7 a and 8 a have substantially the same height as the light emitted from the light source unit 3 (shown by solid line arrows) near the top of the plant 1. The dimming control is performed so that the virtual plane 100 assumed in the above has an average horizontal illuminance of 1000 lux or more. The virtual surface 100 is assumed to be parallel to the ground, and the area thereof is substantially the same as the size of the plant 1 when the plant 1 is viewed from above. The dimming control is performed both when the apparatus is in the growth control mode and when the apparatus is in the viewing mode. Note that the height of the virtual plane 100 is not limited to the same height as the growth point near the top, and may be the height of the growth point at another position or at the height of the top of the plant. There may be.

  With the above configuration, the plant 1 can be exposed to light having an illuminance suitable for good growth because the average horizontal illuminance on the virtual plane is 1000 lux or more even in a room where sunlight is hardly inserted. In addition, since the illuminance on the horizontal plane is maintained at 1000 lux or higher, the plant 1 can be prevented from withering and the good growth state of the plant 1 can be maintained for a long time. This effect is especially high in the negative resistance of roots, spatiphyllum, carnation, pentas, salvia, mini rose, eustoma, chrysanthemum, gloxinia, gerbera, campanula, celosia, ageratum, cyclamen, hanakirin, begonia, exacam, impatiens, saintpaulia, kalanchoe , Paphiopedilum, snapdragon, hydrangea, cineraria, calceolaria, bougainvillea, stock, pot mum, primula, pansy, guzmania, dracaena and the like.

  Next, the effect obtained when the mode of the present apparatus becomes the growth control mode will be described with reference to the results of experiments conducted by the inventors. As described above, in the growth control mode, the plant is irradiated with light in which the ratio of the energy contained in the light in the wavelength region of 450 to 500 nm to the energy contained in the light in the wavelength region of 300 to 800 nm is 45% or more. . So far, it is generally known that blue light having a wavelength range of 400 to 500 nm suppresses the growth of plants, but when light having a wavelength other than 400 to 500 nm is irradiated on the plant simultaneously with blue light. There was no knowledge of the spectral distribution that allowed the flowers to continue to bloom for a long time. For this reason, in this experiment, the ratio of the energy contained in the light in the wavelength region 450 to 500 nm to the energy contained in the light in the wavelength region 300 to 800 nm was used as a parameter. Moreover, in this experiment, the light was individually irradiated with respect to the plant by the various light sources mentioned later with different parameters, and the change in the number of flowers with the passage of time was measured.

  FIG. 5 shows wavelength components of light emitted from various (herein, the following first to fourth types) light sources used in this experiment. In the figure, the horizontal axis indicates the wavelength (nm) of light, and the vertical axis indicates relative energy, which is a relative value with respect to the peak value of energy. Of the various light sources, two types are a combination of a white light source and a blue light source, and the other two types are composed of only the white light source 7.

  The first light source used in this experiment was a combination of a blue fluorescent lamp and a white fluorescent lamp, and light emitted from this light source had a wavelength distribution indicated by a solid line A. According to this wavelength distribution, when the wavelength is approximately 435 nm, the relative energy takes a peak value, and the energy included in the light in the wavelength region of 450 to 500 nm with respect to the energy included in the light in the wavelength region of 300 to 800 nm. The ratio is 45%. In this figure, the energy ratio is calculated by dividing the integral value of relative energy in the wavelength region 450 to 500 nm by the integral value of relative energy in the wavelength region 300 to 800 nm. When the ratio is expressed as a percentage, the calculated value is multiplied by 100 (hereinafter the same).

  Further, the second light source is composed of only white LEDs, and the light emitted from this light source has a wavelength distribution indicated by a solid line B. According to this wavelength distribution, when the wavelength is approximately 460 nm, the relative energy takes a peak value, and the energy included in the light in the wavelength region of 450 to 500 nm with respect to the energy included in the light in the wavelength region of 300 to 800 nm. The ratio is 52%.

  The third light source is a combination of a blue LED and a white fluorescent lamp, and light emitted from the light source has a wavelength distribution indicated by a solid line C. According to this wavelength distribution, when the wavelength is approximately 465 nm, the relative energy takes a peak value, and the energy included in the light in the wavelength region of 450 to 500 nm with respect to the energy included in the light in the wavelength region of 300 to 800 nm. The ratio is 85%.

  Further, the fourth light source is composed of only a white fluorescent lamp, and the light emitted from this light source has a wavelength distribution indicated by a broken line D. According to this wavelength distribution, when the wavelength is approximately 545 nm, the relative energy takes a peak value, and the energy included in the light in the wavelength region of 450 to 500 nm with respect to the energy included in the light in the wavelength region of 300 to 800 nm. The ratio is 19%.

  FIG. 6 shows changes in the number of flowers with the passage of time when light is individually applied to plants from the various light sources described above. In the figure, the vertical axis is a value obtained by dividing the number of flowering that changes over time by the number of flowering on the first day of the experiment, and indicates the relative value of the number of flowers. In this experiment, plants were purchased from general florists, etc., and the number of buds was different for each pot, so the maximum number of flowering was affected by the requirement before light was radiated by the plant growing lighting device. Very big. For this reason, the maximum number of flowering is not considered.

In the above experiment, a mini rose in a No. 2 size pot was used as a plant irradiated with light. This mini rose was installed in a dark box having a size of 300 mm × 500 mm × 500 mm and having an opening at the top, together with various light sources described later. This experiment was conducted in the following experimental sections.
(1) Dark area R ₁ in which the opening of the dark box is covered with a lid and incident light from the outside is completely blocked
(2) A living room where the light from a fluorescent lamp installed on the ceiling of the laboratory enters the dark box, and is approximately the same height as the growth point near the top of the plant, with a horizontal illuminance of approximately 300 lux. Ward R ₂
(3) A white fluorescent lamp section R _{3 in} which a stand-type lighting fixture including a white fluorescent lamp is installed and the horizontal plane illuminance is approximately 2300 lux at the same height as the growth point near the top of the plant.

(4) A stand-type lighting fixture including a white fluorescent lamp and a stand-type lighting fixture including a blue fluorescent lamp are installed one by one, and the amount of light emitted from the white fluorescent lamp is adjusted so that A blue fluorescent lamp and a white fluorescent lamp section R ₄ that are approximately the same height as the growth point and have a horizontal illuminance of approximately 2300 lux.
(5) Blue fluorescent lamp section R in which two stand-type lighting fixtures including blue fluorescent lamps are installed, and the horizontal plane illuminance is approximately 1700 lux at the same height as the growth point near the top of the plant. ₅
(6) A stand-type lighting fixture including a white fluorescent lamp and six blue LED lamps processed into a light bulb shape are installed, and the horizontal plane illuminance is approximately 2300 at the same height as the growth point near the top of the plant. Luxe blue LED and white fluorescent lamp R ₆
(7) A white LED section R _{7 in} which a stand-type lighting fixture including a high-power white LED is installed and the horizontal plane illuminance is approximately 1700 lux at substantially the same height as the growth point near the top of the plant.

  In the above experiment, a small fan that sucks air outside the box and flows it into the box in order to control the temperature was provided in each dark box of the experimental section. In addition, the light period and the dark period were artificially reproduced by turning on / off the power sources of the various light sources in a cycle of 12 hours based on the time information from the timer.

As a result of the experiment, the following items (1) to (5) were confirmed as shown in FIG.
(1) In the dark area R ₁ , the living room area R ₂ and the white fluorescent lamp area R ₃ , the number of flowers reached the maximum in about 5 days from the start of the experiment.
(2) 450 to 500 nm in the white color LED ku _{R 7} energy contained in the light wavelength region is approximately 45% of the energy of the light included in the wavelength range of 300~800nm of flowering after a lapse about 9 days from the start of the experiment The number became the maximum.
(3) White LED ku blue fluorescent lamp energy amount contained in the light of the same wavelength-band 450~500nm and _{R 7} is not less than 45% of the energy contained in the light in the wavelength range 300~800nm and white fluorescent lamp ku R _4, elapsed and blue fluorescent lamp ku R _5, in the blue LED and white fluorescent lamp ku R _6, extends further 3 days day number flowering is maximum compared to the white LED Ward R _7, about 12 days from the start of the experiment Later the flowering number reached the maximum value.
(4) In the dark district R ₁ and the living room district R ₂ , the period from the start date of the experiment until the number of flowering became zero was about 12 days.
(5) and white fluorescent lamp ku _{R 3,} and blue fluorescent lamps and white fluorescent lamp ku _{R 4,} a blue fluorescent lamp ku _{R 5,} a blue LED and white fluorescent lamp ku _{R 6,} in the white LED Ward _{R 7,} The period was about 27 days.

  Considering the above items (1) to (3), the total energy contained in the light in the wavelength region 450 to 500 nm is 45% or more of the total energy contained in the light in the wavelength region 300 to 800 nm. It can be seen that when a certain amount of light is irradiated, the day when the number of flowering is maximized is extended compared to the case where it is not. Further, considering the items (4) and (5), when the plant is irradiated with light from the various light sources including the light source that emits such light, the number of flowering is zero as compared with the case where the light is not applied. It can be seen that the period until is extended.

  Therefore, the present apparatus includes the light source unit 3 that emits light whose energy included in the light in the wavelength region 450 to 500 nm is 45% or more of the energy included in the light in the wavelength region 300 to 800 nm. Since the plant is irradiated with such light, even when the plant is placed in a dim environment where almost no sunlight is inserted, the growth of the plant can be suppressed and the flowering of the cocoon can be delayed. Therefore, senescence is also suppressed in the flowering flower. For this reason, the flowering period in which the flower is blooming can be lengthened while maintaining the size and beauty. Moreover, since the growth of the plant is suppressed, it is possible to prevent branches and leaves from growing too much, so that troublesome work such as pruning is unnecessary and labor can be reduced.

  Next, a first modification of the present apparatus will be described with reference to FIGS. FIG. 7 shows a configuration of the light source unit 3 according to the first modification. The light source unit 3 is different from the configuration of the embodiment shown in FIG. 2 in that a green light source 10 and a red light source 11 are included instead of the white light source 7. The green light source 10 or the red light source 11 includes a light source such as a light bulb, a fluorescent lamp, a metal halide lamp, an electrodeless lamp, a light emitting diode (LED), or an organic EL that emits green or red light. Each of the blue light source 8, the green light source 10, and the red light source 11 is disposed, for example, at the position of a vertex of a triangle and is close to each other. A plurality of light source groups 20 including the blue light source 8, the green light source 10, and the red light source 11 that are close to each other are provided on the same surface of the light source support base 31. The number of the light source groups 20 is four, for example, and the adjacent light source groups 20 are arranged at equal intervals from each other. Note that the light source groups 20 may be scattered on the same surface of the light source support 31. Further, the arrangement and the number of the light source groups 20 are not limited to the above.

  FIG. 8 shows an electrical configuration of the apparatus having the light source unit 3. Compared with the configuration of the embodiment shown in FIG. 3, this apparatus replaces the white light source 7 and its dimming lighting unit 7 a with the green light source 10 and its dimming lighting unit 10 a, the red light source 11 and its dimming unit. It differs by the point provided with the light lighting part 11a. As described above, the light source unit 3 includes the blue light source 8, the green light source 10, and the red light source 11.

  The dimming / lighting units 10a and 11a are composed of dimming / lighting circuits. The dimming / lighting circuits control the light emission amount of the green light source 10 or the red light source 11 by increasing / decreasing the light sources 10 and 11 respectively. / Performs extinction control. The light emission amount control and the on / off control are performed according to a control signal from the control unit 9.

  The control unit 9 performs various controls of the blue light source 8, the green light source 10, and the red light source 11 using the dimming lighting units 8a, 10a, and 11a, and controls the blue light source 8, the green light source 10, and the red light source 11 independently. Such control is performed by transmitting a control signal corresponding to the control content to the dimming lighting units 8a, 10a, and 11a. The various controls described above include light emission amount control of the blue light source 8, the green light source 10, and the red light source 11.

  For example, when the user operates the operation unit 5 to switch the mode of the present apparatus to the growth control mode / viewing mode, the control unit 9 controls the blue light source 8, the green light source 10, and the red light based on the signal from the operation unit 5. The light emission amount of the light source 11 is controlled. By controlling the amount of emitted light, in the growth control mode, the light emitted from each of the blue light source 8, the green light source 10, or the red light source 11 is combined, that is, the light emitted from the entire light source unit 3 is 300 to 300- The wavelength component is controlled so that the ratio of the energy contained in the light in the wavelength region of 450 to 500 nm to the energy contained in the light in the wavelength region of 800 nm is 45% or more. On the other hand, in the viewing mode, the wavelength component is controlled so that the light emitted from the light source unit 3 to the plant 1 looks almost white. This wavelength component control for making light substantially white is performed by, for example, two methods. One method is to reduce the amount of light in the wavelength region of 450 to 500 nm out of the light emitted from the light source unit 3 as compared to that in the growth control mode. For this reason, the light emission amount of the blue light source 8 is reduced. Another method is to increase the light emission amounts of the green light source 10 and the red light source 11.

  Further, various controls performed by the control unit 9 include turning on / off control of the blue light source 8, the green light source 10, and the red light source 11. This on / off control is performed based on the time information transmitted from the timer 6. For example, the control unit 9 recognizes the current time by the timer 6 and turns off the blue light source 8, the green light source 10, and the red light source 11 at a preset time at night. Similarly, the controller 9 turns on the blue light source 8, the green light source 10, and the red light source 11 at a preset time in the morning.

  Also in the first modified example, as in the present apparatus shown in FIG. 2 and FIG. 3, the effect of allowing a flower to continue to bloom for a long period of time, the effect of maintaining a good growth state of the plant for a long period of time, When appreciating plants, it is possible to irradiate the plants with light suitable for viewing.

  Next, a second modification of the present apparatus will be described with reference to FIGS. FIG. 9 shows a configuration of the light source unit 3 according to the second modification. The light source unit 3 is different from the configuration of the embodiment shown in FIG. 2 in that an optical filter 12 is included instead of the blue light source 8. The optical filter 12 is disposed between the white light source 7 and the plant, and includes the light emitted from the white light source 7 in the light in the wavelength region 450 to 500 nm with respect to the energy included in the light in the wavelength region 300 to 800 nm. Light with a ratio of energy to be generated is 45% or more. In the figure, a white fluorescent lamp is illustrated as an example of the white light source 7.

  FIG. 10 shows an electrical configuration of the apparatus having the light source unit 3. Compared with the configuration of the embodiment shown in FIG. 3, the present apparatus uses an optical filter 12 instead of the blue light source 8 and its dimming / lighting unit 8 a, and the optical filter 12 between the plant and the white light source 7. The drive part 12a which consists of a drive mechanism to insert / extract by is provided. The drive unit 12 a inserts and removes the optical filter 12 in accordance with a control signal from the control unit 9. As described above, the light source unit 3 includes the white light source 7 and the optical filter 12.

  When the user operates the operation unit 5 to switch the mode of the apparatus to the growth control mode / viewing mode, the control unit 9 instructs the drive unit 12a to insert / remove the optical filter 12 based on a signal from the operation unit 5 To do. This instruction is made by transmitting a control signal. The drive unit 12a uses the control signal as a trigger, and inserts the optical filter 12 between the white light source 7 and the plant 1 (indicated by a broken line block) in the growth control mode. For this reason, the light emitted from the white light source 7 (shown by a broken line arrow) enters the optical filter 12, and the light transmitted through the optical filter 12 (shown by a one-dot broken line arrow) is light in the wavelength range of 300 to 800 nm. The ratio of the total energy of light in the wavelength region of 450 to 500 nm to the total energy is 45% or more. On the other hand, in the viewing mode, the drive unit 12a removes the optical filter 12 inserted between the white light source 7 and the plant 1 from between them. For this reason, the light irradiated to the plant 1 from the light source part 3 turns white.

  Also in the second modified example, as in the present apparatus shown in FIGS. 2 and 3, the effect of allowing flowers to continue to bloom for a long time, the effect of maintaining a good growth state of the plant for a long time, When appreciating plants, it is possible to irradiate the plants with light suitable for viewing.

  The present invention is not limited to the configuration of the above-described embodiment including the first and second modifications, and various modifications can be made according to the purpose of use. For example, the various light sources constituting the light source unit 3 are not limited to the white light source 7, the blue light source 8, the green light source 10, and the red light source 11, but may be light sources that emit light of other colors. Further, the optical filter 12 may be provided so as to be manually removable instead of being automatically inserted and removed by the drive unit 12a.

The block diagram of the illuminating device for plant cultivation which concerns on one Embodiment of this invention. The block diagram of the light source part of the said apparatus. The block diagram which shows the electrical constitution of the said apparatus. (A) is a block diagram for demonstrating the horizontal surface illumination intensity of the light radiate | emitted from the light source part of the said apparatus, (b) is a top view when the plant mounted in the said apparatus is seen from upper direction. The figure which shows the wavelength component of the light radiate | emitted from various light sources. The figure which shows the flowering number transition when light is individually irradiated to the plant by the said various light sources. The block diagram of the light source part in the 1st modification of the said apparatus. The block diagram which shows the electric constitution of the 1st modification of the said apparatus. The block diagram of the light source part in the 2nd modification of the said apparatus. The block diagram which shows the electric constitution of the 2nd modification of the said apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plant 2 Plant mounting stand 3 Light source part 7 White light source (illumination means)
8 Blue light source (illumination means)
7a, 8a Dimming / lighting section (illumination means)
9 Control unit (lighting means)
DESCRIPTION OF SYMBOLS 10 Green light source 11 Red light source 12 Optical filter 100 Virtual surface

Claims (3)

In order to adjust the growth of the plant, in the plant growth lighting device comprising an irradiation means for controlling the irradiation of light to the plant,
The irradiating means has a wavelength such that light emitted to the plant has a ratio of energy contained in light in a wavelength region of 450 to 500 nm to energy contained in light in a wavelength region of 300 to 800 nm is 45% or more. A plant-growing lighting device characterized by controlling an ingredient.   The height of the growth point near the top of the plant is assumed to be parallel to the ground, and the area is approximately the same as the size of the plant when viewed from above. The plant growing lighting device according to claim 1, wherein the lighting device is 1000 lux or more.   The irradiation means performs irradiation by reducing the amount of light in the wavelength region of 450 to 500 nm of the irradiated light when a person is watching a plant compared to when the person is not watching a plant. The plant growing illumination device according to claim 1 or 2, wherein the wavelength component is controlled so that the light to be viewed looks substantially white.

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