JP5308070B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Conventionally, as lighting devices that realize energy saving, those that control the light source to detect ambient illuminance and keep the illuminance constant, those that use natural light as part of the lighting, and manage the lighting time with a time schedule Things are known. An illuminating device that controls a light source so as to keep the illuminance constant can realize energy saving by not increasing the light output of the light source more than necessary. An illumination device that manages illumination time according to a time schedule can realize energy saving by turning off the light source in an unnecessary time zone.

As an illuminating device that controls a light source so as to keep the illuminance constant, Patent Document 1 discloses a first mode in which the illuminance of an irradiated surface irradiated with light from the light source is set to a predetermined value and brightness detection means. Mode switching means for switching the second mode for receiving the detection value and controlling the light output of the light source, and storage means for storing the detection value of the brightness detection means when switching from the first mode to the second mode. A lighting device is disclosed. In the second mode, the illumination device of Patent Document 1 controls the light output of the light source so that the detection value stored in the storage unit is set as the illuminance target value and the detection value of the brightness detection unit is maintained at the illuminance target value. To do.
Japanese Patent Laid-Open No. 10-270178

  However, since only one illuminance target value can be set in the lighting device of Patent Document 1, the illuminance target value is constant throughout the day and the illuminance of outside light other than the light source is different (for example, daytime). And nighttime), there was a problem that a sense of incongruity occurred in the brightness of people.

  In order to solve the above problem, the illumination device of Patent Document 1 enables setting change of the illuminance target value, but it is inconvenient to perform the setting operation of the illuminance target value many times a day. When installed in a residential room, it was inconvenient.

  The present invention has been made in view of the above points, and its purpose is to increase the energy saving effect while reducing the uncomfortable feeling of human brightness on the irradiated surface when used in a living room of a house, etc. An object of the present invention is to provide a lighting device capable of improving usability.

According to the first aspect of the present invention, there is provided a light source, a lighting device for turning on the light source, an illuminance detection means for detecting an illuminance of an irradiated surface irradiated with light from the light source, and an illuminance detection value of the illuminance detection means. A lighting control means for controlling the lighting device to turn on the light source so as to obtain an illuminance target value, and a control illuminance target value that is an illuminance target value used by the lighting control means for external light other than the light source. A selection unit that selects from among a plurality of illuminance target values according to illuminance, and a threshold value in which the illuminance detection value of the illuminance detection unit at the time of extinction including immediately before the light source is turned on is set smaller than the plurality of illuminance target values A determination means for determining whether or not the value is larger, a timer section for timing an arbitrarily set time, and measurement by the timer section when the determination means determines that the detected illuminance value has reached the threshold value. Thailand to start A control unit and a constant illuminance button that is operated when the illuminance of the irradiated surface is controlled to be constant. The plurality of illuminance target values include a first illuminance target value and the first illuminance target value. A second second illuminance target value that is smaller than the threshold value, and when the determination unit determines that the detected illuminance value is greater than the threshold when the constant illuminance button is operated, the timer unit Is selected, the first illuminance target value is selected as the control illuminance target value, and the second illuminance target value is selected as the control illuminance target value when the timer unit finishes timing. On the other hand, if the determination means determines that the detected illuminance value is equal to or less than the threshold when the constant illuminance button is operated, the second illuminance target value is selected as the control illuminance target value. It is characterized by.

The invention of claim 2 is characterized in that, in the invention of claim 1 , the selecting means reduces the control illuminance target value as time elapses after completion of the time measurement by the timer unit.

The invention of claim 3 comprises the clock means for indicating the current time in the invention of any one of claims 1 or 2 , wherein any one of the plurality of illuminance target values is associated with each of a plurality of time zones, The selection means selects an illuminance target value corresponding to a time zone including the current time as the control illuminance target value.

  According to the invention of claim 1, when the illuminance of the external light is different by selecting the control illuminance target value from the plurality of illuminance target values according to the illuminance of the external light other than the light source (for example, daytime) Since the illuminance of the irradiated surface can be changed at night), it is possible to reduce a sense of discomfort with respect to the human brightness on the irradiated surface. Thereby, since it is not necessary to change the setting of the illuminance target value according to the illuminance of the external light, it is possible to improve the usability when using it in a residential room or the like as compared with the case where the illuminance target value is one. it can.

  According to the first aspect of the present invention, a plurality of illuminance target values can be properly used as control illuminance target values, and a low illuminance target value can be selected depending on the illuminance of external light. It is possible to prevent the output from becoming larger than necessary. As a result, the energy saving effect can be enhanced as compared with the case where the illuminance target value is one.

Furthermore, according to the first aspect of the present invention, by selecting the control illuminance target value according to the comparison result between the illuminance detection value immediately before the light source is turned on and the first threshold value, It is possible to set the illuminance according to.

Further, according to the invention of claim 1, the first illumination target value illuminance detection value at the lighting immediately preceding light source is selected as the control illuminance target value is greater than the threshold value, the illuminance detected value threshold value By making it larger than the second illuminance target value selected as the control illuminance target value when it is smaller, the illuminance of the irradiated surface can be increased when the illuminance of external light is large. When it is small, the illuminance of the irradiated surface can be lowered.

Furthermore, according to the first aspect of the present invention, the illuminance detection means and the timer unit are used, and the control illuminance target value is selected according to the timing operation by the timer unit. Can be realized.

According to the second aspect of the present invention, after the time measurement by the timer unit is completed, the selection unit can reduce the control illuminance target value, thereby providing relaxation illumination for smooth sleep. It is possible to perform illumination control suitable for the above.

According to the third aspect of the present invention, the selection unit selects the illuminance target value corresponding to each of the plurality of time zones as the control illuminance target value according to the current time, so that the irradiated surface is optimal for each time zone. Illuminance can be achieved.

(Embodiment 1)
First, the structure of the illuminating device of Embodiment 1 is demonstrated using FIGS. As shown in FIG. 1, this lighting device includes a lighting fixture 1 installed on a ceiling surface C (see FIG. 2) of a room, and a remote control device (hereinafter referred to as “remote control”) capable of transmitting a wireless signal S to the lighting fixture 1. Device ") 2.

  The luminaire 1 includes a light source 3 capable of dimming and lighting, a lighting device 4 that supplies power to the light source 3 to turn on the light source 3, a receiving device 5 that receives a wireless signal S from the remote control device 2, a light source 3 is provided with an illuminance detection unit (illuminance detection means) 6 for detecting the illuminance of the irradiated surface irradiated with the light from 3. In the present embodiment, a fluorescent lamp is used as the light source 3.

  The lighting device 4 is connected to the AC power source AC by the power source connection unit 40, converts the AC power from the AC power source AC to DC power via the filter 41, and outputs a power factor improving unit 42. The inverter part 43 which converts the direct current power output from the rate improvement part 42 into the alternating current power suitable for lighting of the light source 3, and the control part 44 which controls the power factor improvement part 42 and the inverter part 43 are provided.

  The control unit 44 controls the inverter unit 43 so that the light source 3 is dimmed and lit by continuously varying in a range of 10% to 100% with respect to the total lighting in accordance with the dimming signal from the receiving device 5. To do. When the duty ratio of the dimming signal is 100%, the light source 3 is fully lit (100% lighting), and when the duty ratio is 10%, the light source 3 is lit with a light quantity of 10% with respect to the total lighting. Is set to

  In addition, when the dimming signal for turning on the light source 3 is input, the control unit 44 turns off the light source 3 immediately before the dimming signal is input or the nightlight 54 described later is on. In such a case, the inverter unit 43 is controlled so that the light source 3 is fully lit through a preheating and starting sequence. On the other hand, when the light source 3 immediately before the dimming signal is input is in the dimming state, the control unit 44 switches the inverter unit 43 so that the light source 3 smoothly changes from dimming lighting to full lighting. Control.

  The receiving device 5 includes a receiving unit 50 that receives the wireless signal S from the remote control device 2, and a memory unit 51 that stores a plurality of illuminance target values each used as a target value of the illuminance detection value of the illuminance detection unit 6. A timer unit (clock means) 52 that indicates the current time, a control unit 53 that outputs a dimming signal to the lighting device 4, a nightlight 54 composed of LEDs, and a drive unit 55 that drives the nightlight 54. Yes. The control unit 53 of the receiving device 5 and the control unit 44 of the lighting device 4 are connected by a signal line L.

  The receiving unit 50 is an infrared light receiving element that receives the wireless signal S from the remote control device 2.

  The memory unit 51 stores in advance a dimming table with a duty according to the dimming ratio. Further, the memory unit 51 stores a target value table in which a plurality of illuminance target values correspond one-to-one in a plurality of time zones. The plurality of time zones refers to a plurality of time zones in which the illuminance of external light on the irradiated surface is different from each other. Specifically, the memory unit 51 stores a first illuminance target value of 560 Lx, which is 80% of the total lighting of the light source 3, corresponding to the morning time zone, the noon time zone, and the evening time zone. The second illuminance target value of 420 Lx, which is 75% of the first illuminance target value, is stored corresponding to the night time zone and the midnight time zone.

  When the reception unit 50 receives the wireless signal S, the control unit 53 determines the received wireless signal S and outputs a dimming signal corresponding to the wireless signal S to the lighting device 4. The dimming signal is a duty signal (operating frequency is about 1 kHz), and dimming is performed by changing the duty ratio.

  At this time, as shown in FIG. 3, the average illuminance of the irradiated surface is 700 Lx when fully lit (100% lit), 70 Lx when lower limit output (10% lit), and the control illuminance target value is 560 Lx. When set to (80% of all lighting), when natural light (external light) is 0 Lx, the light output of the light source 3 is 80% of all lighting. As natural light increases, feedback control is performed while lowering the light output of the light source 3 so that the detected illuminance value becomes constant at the control illuminance target value. However, since the light output of the light source 3 cannot be reduced to less than 10% of full lighting, the light output of the light source 3 is fixed to 10% when the illuminance by natural light becomes 490 Lx or more. For this reason, the illuminance detection value increases more than the control illuminance target value as the natural light increases.

The control unit 53 illustrated in FIG. 1 includes a selection mode for selecting a control illuminance target value for actual use from a plurality of illuminance target values stored in the memory unit 51 , and an illuminance detection value of the illuminance detection unit 6 There is a lighting control mode in which the lighting device 4 is controlled to turn on the light source 3 so as to be the control illuminance target value. That is, the control unit 53 of this embodiment corresponds to both the selection unit and the lighting control unit of the present invention.

Furthermore, the control unit 53 uses the data table of the memory unit 51 to select the illuminance target value corresponding to the time zone including the current time as the control illuminance target value.

The illuminance detection unit 6 includes a photo IC diode (not shown) that detects ambient brightness, and detects the illuminance of the irradiated surface. The output current of the photo IC diode changes depending on the amount of incident light. The output from the irradiation detecting unit 6 is obtained is converted into a voltage signal by the load resistor in series with the photo IC diode (not shown). The output signal is set in the range of, for example, 0 V to 5 V according to the amount of incident light. The output signal is 0 V when the amount of incident light is 0 (dark state), and the output current is when the amount of incident light is maximum (bright state). 5V.

  Here, the structure of the lighting fixture 1 is demonstrated using FIG. The lighting fixture 1 is provided with a power connection 40 at the center of the disk-shaped housing 10 and is attached to a hook-type fixture mounting portion / AC power supply portion (not shown) installed on the ceiling surface C. In addition, the light source 3, the lighting device 4, and the receiving device 5 are attached to the housing 10 together with a reflection plate 11 for reflecting light from the light source 3 downward. The lower surface of the lighting fixture 1 is covered with a resin cover 12 having translucency. The illuminance detection unit 6 is housed in a frame 13 attached to the outer periphery of the housing 10 so as not to directly receive light from the light source 3 and is disposed above the light source 3.

  Next, the configuration of the remote control device 2 will be described with reference to FIG. The remote control device 2 includes a transmitter 20 that transmits a wireless signal S, an operation button 21 for operating the lighting fixture 1, a setting button 22 for performing various settings, and a control that controls the entire remote control device 2. Part 23.

  The transmission unit 20 includes a plurality of infrared LEDs 200, 200, 200.

  The main use of the operation button 21 is to turn on or turn off the light source 3, turn on the nightlight 54, set the dimming level, turn off, and set / cancel the illuminance constant control function.

  As the setting button 22, a brightness setting button 220 (see FIG. 2) for setting an illuminance target value and a correction button 221 (see FIG. 2) for correcting a shift in detection voltage due to a difference in reflectance of the irradiated surface. ) And a constant illuminance button 222 for controlling the constant illuminance.

  Here, the structure of the remote control device 2 will be described with reference to FIG. The remote control device 2 includes a housing 24 that houses the transmission unit 20 so that the radiation surface of each infrared LED 200 of the transmission unit 20 is exposed. The casing 24 is provided with an operation button 21 and a setting button 22 on the front surface 240, and the control unit 23 is housed inside.

  Next, operation | movement of the illuminating device of this embodiment is demonstrated using FIG. First, a case where the light source 3 is fully lit (100% lighting) will be described. When the full lighting button 210 (see FIG. 2) of the remote control device 2 is pressed, a wireless signal S for causing the light source 3 to be fully turned on is transmitted from the remote control device 2 to the lighting fixture 1.

  When receiving the wireless signal S, the receiving device 5 of the lighting fixture 1 determines information included in the received wireless signal S and outputs a dimming signal for turning on the light source 3 to the lighting device 4. When the dimming signal is input, the lighting device 4 turns on the light source 3 completely.

  Note that when the light source 3 is dimmed, the same operation is performed as when the light source 3 is fully lit.

  Next, an operation for making the illuminance detection value and the control illuminance target value constant in the illumination device of the present embodiment will be described with reference to FIG. First, after the light source 3 (see FIG. 1) is turned on with a predetermined duty (S1 in FIG. 4), the illuminance detection unit 6 (see FIG. 1) detects the illuminance detection value every second (S2), and the receiving device 5 control unit 53 (see FIG. 1) stores the illuminance detection value in the memory unit 51 (see FIG. 1) and counts the number of times of illuminance detection (S3). The above steps S2 and S3 are repeated. After that, the illuminance detection unit 6 detects the illuminance detection value ten times, and the control unit 53 stores the ten illuminance detection values in the memory unit 51 (S4). The average value of eight illuminance detection values excluding the maximum value and the minimum value among the detected illuminance values is obtained, and the obtained average value is adopted as the illuminance detection value (S5). Thereafter, the control unit 53 changes the duty of the dimming signal by 2%, for example, every second so that the illuminance detection value approaches the control illuminance target value (S6). In each case, the illuminance detection unit 6 measures the illuminance detection value once, and the control unit 53 determines whether or not the illuminance detection value is within ± 5% of the control illuminance target value (S7). At this time, the control unit 53 counts the number of determinations (S8), and the illuminance detection value is not within ± 5% of the control illuminance target value even if the duty of the dimming signal is repeatedly changed 10 times. (S9) Returning to step S2, the illuminance detection unit 6 detects the illuminance detection value 10 times every second, and the control unit 53 adjusts so that the average value of the illuminance detection values approaches the control illuminance target value. The control unit 53 determines whether or not the detected illuminance value is within ± 5% of the control illuminance target value by changing the duty of the optical signal by 2% every second. The above operation is repeated until the illuminance detection value falls within ± 5% of the control illuminance target value. This operation is performed by a microcomputer program of the control unit 53.

  By performing the above operation, the illuminance detection unit 6 reacts sensitively and the light output of the light source 3 rises and falls when the natural light changes frequently because the sun is hidden behind the clouds or comes out of the clouds. Discomfort can be suppressed.

  Then, the illumination intensity constant control function of the illuminating device of this embodiment is demonstrated using FIG. First, when the constant illuminance button 222 (see FIG. 2) of the remote control device 2 is pressed in the morning time zone, the control unit 53 (see FIG. 1) of the receiving device 5 causes the memory unit to correspond to the morning time zone. The first illuminance target value (560Lx) stored in 51 is selected as the control illuminance target value. Thereafter, the light output of the light source 3 is feedback-controlled so that the illuminance detection value of the illuminance detection unit 6 (see FIG. 1) becomes the control illuminance target value. At this time, since natural light is 210 Lx, the illuminance detection value becomes the control illuminance target value by setting the light output of the light source 3 to 50% of full lighting.

  Subsequently, when the daylight time is reached and the natural light increases to 490 Lx or more, the control unit 53 fixes the light output of the light source 3 to 10% (lower limit) of full lighting. Therefore, the illuminance detection value of the illuminance detection unit 6 increases beyond the control illuminance target value.

  Thereafter, when the natural light falls to 70 Lx in the evening time zone, the control unit 53 controls to increase the light output of the light source 3 to 70% of the total lighting. Thereby, the illuminance detection value of the illuminance detection unit 6 becomes the control illuminance target value.

  Thereafter, when the night time zone is reached, the control unit 53 changes the second illuminance target value (420Lx) to a new control illuminance target value, and feedback-controls the light output of the light source 3. Since natural light is 0, the light output of the light source 3 is 60% of the total lighting. The operation at midnight is the same as that at night.

  As described above, according to the present embodiment, the control unit 53 of the receiving device 5 illustrated in FIG. 1 selects the control illuminance target value from a plurality of illuminance target values according to the illuminance of external light other than the light source 3, thereby Since the illuminance of the irradiated surface can be changed when the illuminance of light is different (for example, during the daytime and at night), it is possible to reduce a sense of incongruity with respect to the brightness of the person on the irradiated surface. Thereby, since it is not necessary to change the setting of the illuminance target value according to the illuminance of the external light, it is possible to improve the usability when using it in a residential room or the like as compared with the case where the illuminance target value is one. it can.

  Further, according to the present embodiment, a plurality of illuminance target values can be properly used as the illuminance target value for control, and a low illuminance target value can be selected depending on the illuminance of external light. Can be prevented from becoming larger than necessary. As a result, the energy saving effect can be enhanced as compared with the case where the illuminance target value is one.

  Furthermore, according to the present embodiment, the control unit 53 selects the illumination target value corresponding to each of the plurality of time zones as the control illumination target value according to the current time, whereby the irradiated surface is set for each time zone. Optimum illumination can be achieved.

  As a modification of the present embodiment, weak wireless communication or specific low power wireless communication may be used as communication between the receiving device 5 of the lighting fixture 1 and the remote control device 2 instead of infrared communication. The same applies to the following second to fourth embodiments.

  Further, the illuminance detection unit 6 of the present embodiment is not limited to a photo IC diode, and may include an element for detecting ambient brightness such as a phototransistor, a photo Darlington transistor, or a CdS photoconductive cell. Moreover, you may utilize the electromotive force by a photovoltaic cell. The same applies to the following second to fourth embodiments.

  Furthermore, the attachment position of the illuminance detection unit 6 of the present embodiment is not limited to the attachment arrangement shown in FIG. 2 unless direct light from the light source 3 is detected. For example, the detection range has a degree of freedom. Therefore, the illuminance detection unit 6 may be configured separately from the luminaire 1. The same applies to the following second to fourth embodiments.

  Further, the light source 3 of the present embodiment is not limited to a fluorescent lamp, and may be an incandescent lamp or a bulb-type fluorescent lamp. When the light source 3 is an incandescent lamp, the lighting device 4 performs lighting and dimming control of the incandescent lamp by controlling the phase of the AC power supply AC.

(Embodiment 2)
In the illumination device of the second embodiment, the control unit 53 of the reception device 5 determines whether or not the illuminance detection value of the illuminance detection unit 6 when the light source 3 is turned off has reached a determination reference value (see FIG. 6). It differs from the illuminating device of Embodiment 1 by having a mode. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the memory unit 51 of the present embodiment, as a plurality of illuminance target values, a first illuminance target value of 560 Lx that is 80% of the total lighting of the light source 3 and 420 Lx that is 75% of the first illuminance target value. A second illuminance target value is stored. The first illuminance target value of the present embodiment corresponds to the third illuminance target value of the present invention, and the second illuminance target value of the present embodiment corresponds to the fourth illuminance target value of the present invention.

  The timer unit 52 of the present embodiment has a function of measuring an arbitrarily set time instead of the function of indicating the current time.

  When it is determined that the illuminance detection value has reached the determination reference value in the determination mode, the control unit 53 of the present embodiment starts measurement by the timer unit 52. The control unit 53 of the present embodiment corresponds to the timer control means of the present invention, and the determination reference value of the present embodiment corresponds to the second threshold value of the present invention.

The control unit 53 while the timer unit 52 is clocking, to select the third illumination target value as the control illuminance target value, the timer portion 52 and the fourth as a control for intensity target value for completing the counting Select the target illuminance.

Next, operation | movement of the illuminating device of this embodiment is demonstrated using FIG. The determination reference value is set to 30Lx. First, the output operation of the luminaire 1 is in the off state, and the illuminance detection value of the illuminance detection unit 6 gradually increases in the morning. When the detected illuminance value exceeds the determination reference value (timing t1), the timer unit 52 starts a counting operation for 15 hours.

Thereafter, when the constant illuminance button 222 of the remote control device 2 is pressed at timing t2, the control unit 53 selects the first illuminance target value as the control illuminance target value, and the illuminance detection value is the first illuminance target for control. The light output of the light source 3 is feedback-controlled so that the value (560Lx) is obtained. Thereafter, when the natural light continues to increase and the illuminance detection value becomes 560 Lx or more (timing t3), the control unit 53 fixes the light output of the light source 3 to 10% output (lower limit).

Thereafter, when the illuminance detection value becomes 560 Lx or less again (timing t4), the control unit 53 performs feedback control for gradually increasing the light output of the light source 3 so that the illuminance detection value becomes 560Lx. When the timer unit 52 completes the counting operation of the time T1 (for example, 15 hours) at the timing t5, the control unit 53 gradually sets the control illuminance target value over the time T2 (for example, 30 minutes) to the second illuminance target value. (420Lx) to reduce unpleasant sensation due to a sudden change in illuminance. At timing t6, the control unit 53 selects the second illuminance target value as a new illuminance target value for control, and performs feedback control of the light output of the light source 3.

  As described above, according to the present embodiment, the illuminance detection unit 6 and the timer unit 52 are used to select the control illuminance target value according to the timing operation by the timer unit 52, thereby using the configuration of the existing lighting device. It can be realized at low cost.

  As a modification of the second embodiment, a determination reference value as in the second embodiment may be provided for each time period set in the first embodiment. In the present modification, the control unit 53 determines whether or not the illuminance detection value when the light source 3 is turned off has reached a determination criterion value corresponding to each time zone, and the above-mentioned in any time zone. When the illuminance detection value reaches the determination reference value, measurement by the timer unit 52 is started.

(Embodiment 3)
The illumination device of Embodiment 3 has a determination mode in which the control unit 53 determines whether or not the illuminance detection value of the illuminance detection unit 6 immediately before the light source 3 is turned on is greater than a determination reference value (see FIG. 7). This is different from the illumination device of the first embodiment. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the memory unit 51 of the present embodiment, as a plurality of illuminance target values, a first illuminance target value of 560 Lx that is 80% of the total lighting of the light source 3 and 420 Lx that is 75% of the first illuminance target value. A second illuminance target value is stored. The first illuminance target value of the present embodiment corresponds to the first illuminance target value of the present invention, and the second illuminance target value of the present embodiment corresponds to the second illuminance target value of the present invention.

  When determining that the detected illuminance value is greater than the determination reference value, the control unit 53 of the present embodiment selects the first illuminance target value as the control illuminance target value, and determines that the detected illuminance value is equal to or less than the determination reference value. The second illuminance target value is selected as the control illuminance target value. That is, the control unit 53 of the present embodiment is different from the control unit 53 of the first embodiment in that the control illuminance target value is not selected according to the current time.

  Next, operation | movement of the illuminating device of this embodiment is demonstrated using FIG. The determination reference value is set to 30Lx. First, the output operation of the luminaire 1 is in the off state, and the illuminance detection value of the illuminance detection unit 6 gradually increases. The illuminance detection value exceeds the determination reference value at timing t11 in FIG. Thereafter, when the constant illuminance button 222 (see FIG. 2) of the remote control device 2 is pressed at timing t12, the illuminance detection unit 6 measures the illuminance detection value (S11 in FIG. 8), and the illuminance detection value is equal to or less than the determination reference value. The control unit 53 determines whether or not it is (S12). If the illuminance detection value is equal to or less than the determination reference value, the control illuminance target value is set as the second illuminance target value (S13). On the other hand, if the detected illuminance value is not less than or equal to the determination reference value, the control unit 53 selects the first illuminance target value as the control illuminance target value, and starts controlling the light output of the light source 3.

  Thereafter, at timing t14, the housekeeper goes out, so when the light source 3 is turned off, the illuminance detection unit 6 has an illuminance detection value corresponding to only the illuminance of natural light (t14 to t16). At timing t <b> 16, when the householder comes home and the constant illuminance button 222 (see FIG. 2) of the remote controller 2 is pressed, the illuminance detection unit 6 measures the illuminance detection value. Since the illuminance detection value is equal to or less than the determination reference value, the control unit 53 selects the second illuminance target value as the control illuminance target value, and starts controlling the light output of the light source 3.

  As described above, according to the present embodiment, by selecting the control illuminance target value according to the comparison result between the illuminance detection value and the determination reference value immediately before the light source 3 is turned on, the surface to be irradiated is made to correspond to the illuminance of external light. Can be set to high illuminance.

  In addition, according to the present embodiment, the first illuminance target value selected as the control illuminance target value when the illuminance detection value immediately before the light source 3 is turned on is larger than the determination reference value, the illuminance detection value is the determination reference. By making it larger than the second illuminance target value selected as the control illuminance target value when it is smaller than the value, the illuminance of the irradiated surface can be increased when the illuminance of external light is large, and the illuminance of external light When the value is small, the illuminance of the irradiated surface can be lowered.

As a modification of the third embodiment, a determination reference value as in the third embodiment may be provided for each time period set in the first embodiment. In the present modification, the control unit 53 determines whether or not the detected illuminance value immediately before the light source 3 is turned on is larger than the determination reference value corresponding to each time zone, and the control illuminance target value is determined according to the determination result. The first illuminance target value or the second illuminance target value is selected. The same applies to the fourth embodiment.

(Embodiment 4)
The illumination device of the fourth embodiment is different from the illumination device of the second embodiment in that a plurality of illuminance target values having different sizes are stored in the memory unit 51 as the second illuminance target value. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the memory unit 51 of the present embodiment, as a fourth illuminance target value, an illuminance target value of 490 Lx that is 70% of the total lighting of the light source 3, an illuminance target value of 420 Lx that is 60% of the total lighting of the light source 3, An illuminance target value of 350 Lx, which is 50% of the total lighting of the light source 3, is stored.

  The control unit 53 of the present embodiment switches the fourth illuminance target value in order from the larger one as the control target value when the timer unit 52 completes the time measurement.

Next, the operation of the lighting device when the lighting device of the present embodiment is used will be described with reference to FIGS. The operation up to timing t25 shown in FIG. 9 is the same as the operation up to timing t5 (see FIG. 6) of the second embodiment.

  Thereafter, when the timer unit 52 completes the counting operation of the time T1 at the timing t25, the control unit 53 gradually increases the control illuminance target value from the first illuminance target value (560Lx) at the time T2 (for example, 30 minutes). At timing t26, the illuminance target value of 490Lx, which is 70% of the total lighting, is changed as a new control illuminance target value, and the light output of the light source 3 is feedback-controlled (time T2 in FIG. 9). Furthermore, when one hour has passed (timing t27), the control unit 53 gradually lowers the control illuminance target value from 490Lx to 420Lx over 30 minutes. Similarly, from time t29 to t30, the controller 53 gradually decreases the control illuminance target value from 420Lx to 350Lx. With the above operation, the daily illuminance is as shown in FIG.

  As described above, according to the present embodiment, after the time measurement by the timer unit 52 is completed, the control unit 53 reduces the control illuminance target value, so that relaxation illumination for smooth sleep can be obtained. Lighting control suitable for biological rhythm can be performed.

(Embodiment 5)
By the way, although Embodiment 1-4 demonstrated the case where the illumination intensity detection value of the illumination intensity detection part 6 was constant if the illumination intensity of the to-be-irradiated surface was the same in any place, in fact, it is a lighting fixture Because the reflectance of the illuminated surface varies depending on the color of the carpet and floor in the room where 1 is installed, the presence of a table installed in the room, etc., even if the illuminated surface has the same illuminance, the illuminance detection value is shifted Occurs. For example, in a room with high reflectance, the detected illuminance value increases and the light output of the light source 3 decreases, so the actual illuminance is lower than the illuminance target value. On the other hand, in a room with a low reflectance, the detected illuminance value decreases and the light output of the light source 3 increases, so the actual illuminance becomes higher than the illuminance target value.

  Therefore, the illumination device of the fifth embodiment has a function of correcting the deviation of the detected illuminance value so that the illuminance of the irradiated surface is constant regardless of the difference in reflectance.

  First, when the correction button 221 is pressed with the light source 3 fully turned on (100% output) in the absence of natural light, the illuminance detection unit 6 measures the illuminance. Thereafter, the control unit 53 obtains a ratio to the illuminance reference value for all lamps stored in the memory unit 51, that is, the reflectance, by calculation, and stores the obtained value in the memory unit 51 as a correction coefficient. The illuminance reference value is set in advance by measuring the difference in reflectance in advance. For example, assuming that the illuminance reference value is 2V, if the illuminance detection value of the illuminance detection unit 6 is 1V, the correction coefficient is 0.5V. The corrected illuminance target value is a value obtained by multiplying the illuminance reference value by the correction coefficient 0.5.

  As described above, according to the present embodiment, the deviation of the illuminance detection value is corrected so that the illuminance of the irradiated surface is constant regardless of the difference in the reflectance regardless of the reflectance of the irradiated surface. By doing so, the illuminance of the irradiated surface can be kept constant at the control illuminance target value.

It is a block diagram which shows the structure of the illumination system which concerns on Embodiment 1. FIG. It is a conceptual diagram which shows operation | movement of the illumination system which concerns on the same as the above. It is an external view of the illumination system which concerns on the same as the above. It is a flowchart which shows operation | movement of the illumination system which concerns on the same as the above. It is a figure which shows the light output of the light source of the illumination system which concerns on the same as the above. 6 is a timing chart illustrating an operation of the illumination system according to the second embodiment. 10 is a timing chart illustrating an operation of the illumination system according to the third embodiment. It is a flowchart which shows operation | movement of the illumination system which concerns on the same as the above. 10 is a timing chart illustrating an operation of the illumination system according to the fourth embodiment. It is a figure which shows the light output of the light source of the illumination system which concerns on the same as the above.

Explanation of symbols

3 Light source 4 Lighting device 51 Memory unit 52 Timer unit (clock means)
53 control unit (selection means, lighting control means, first determination means, second determination means, timer control means)
6 Illuminance detection unit (illuminance detection means)

Claims (3)

A light source;
A lighting device for lighting the light source;
Illuminance detection means for detecting the illuminance of the irradiated surface irradiated with light from the light source;
Lighting control means for controlling the lighting device so that the illuminance detection value of the illuminance detection means becomes an illuminance target value, and lighting the light source;
Selection means for selecting a control illuminance target value, which is an illuminance target value used by the lighting control means, from a plurality of illuminance target values according to the illuminance of outside light other than the light source ;
Determining means for determining whether an illuminance detection value of the illuminance detecting means at the time of turning off including immediately before turning on the light source is greater than a threshold set smaller than the plurality of illuminance target values;
A timer section for measuring an arbitrarily set time;
Timer control means for starting measurement by the timer unit when it is determined by the determination means that the detected illuminance value has reached the threshold;
An illuminance constant button operated when the illuminance of the irradiated surface is controlled to be constant,
The plurality of illuminance target values include a first illuminance target value and a second illuminance target value smaller than the first illuminance target value,
When the determination means determines that the detected illuminance value is greater than the threshold when the constant illuminance button is operated, the selection means determines the control illuminance target value while the timer unit is timing. The first illuminance target value is selected, and when the timer unit finishes timing, the second illuminance target value is selected as the control illuminance target value, while the illuminance constant button is operated. When the determination unit determines that the detected illuminance value is equal to or less than the threshold value, the second illuminance target value is selected as the control illuminance target value . 2. The lighting device according to claim 1 , wherein the selection unit decreases the control illuminance target value with time after completion of the time measurement by the timer unit . A clock means for indicating the current time,
One of the plurality of illuminance target values is associated with each of a plurality of time zones,
It said selection means, the lighting device according to claim 1 or 2, wherein the selecting the illuminance target value corresponding to the time zone including the current time as the control for illumination target values.

Images