JP5491779B2 - Lighting fixture and lighting system - Google Patents

Description

  The present invention relates to a lighting fixture and a lighting system.

  Conventionally, as a lighting fixture for lighting a dimmable light source such as a discharge lamp, the light output of the light source is reduced below the rated output when there is external light, and the light from the light source when there is no external light. Some have achieved power saving by controlling the output to be a rated output (see, for example, Patent Document 1). In this luminaire, in order to adjust the light output of the light source according to the brightness of outside light, the illuminance of the irradiated surface is kept constant based on the result of detecting the illuminance of the irradiated surface by the brightness sensor. Built-in lighting device that can adjust the light output of the light source.

  Here, a conventional lighting fixture will be described with reference to FIGS. FIG. 24A is a schematic configuration diagram of a conventional lighting fixture, and FIG. 24B is a block diagram showing a circuit configuration of the lighting fixture.

  On the ceiling 101 of the building room 100, a lighting fixture 1 having a light source 4 such as a discharge lamp and a lighting device 2 for turning on the light source 4 is installed, and a brightness sensor 3 is installed in the vicinity of the lighting fixture 1. Has been.

  The brightness sensor 3 detects the brightness of an irradiated surface (for example, the floor surface 102 or a desk top) on which the illumination light of the lighting fixture 1 is irradiated, and the amount of reflected light from the irradiated surface. The voltage value corresponding to is output.

  The lighting device 2 outputs a target illuminance storage unit 12 that stores the target illuminance of the irradiated surface in advance, and a dimming signal that controls the light output so that the illuminance detected by the brightness sensor 3 matches the target illuminance. From the output control unit 11, the output control unit 13 that outputs a command value for determining the light output of the light source 4 such as a discharge lamp based on the dimming signal from the brightness control unit 11, and the output control unit 13 And a lighting circuit unit 14 for supplying lighting power corresponding to the command value to the light source 4.

  Here, the target illuminance set in the target illuminance storage unit 12 is determined by the following method. While constructing the luminaire 1, the builder measures the illuminance of the illuminated surface using an illuminometer or the like, and operates the remote control transmitter 7 to change the light output of the luminaire 1 to obtain the desired illuminance of the illuminated surface. Illuminance. Then, in a state where the illuminance of the irradiated surface is adjusted to a desired illuminance, the brightness sensor 3 detects the amount of reflected light from the irradiated surface, and the sensor signal at this time is input to the lighting device 2 for lighting. In the apparatus 2, a sensor signal level having a predetermined width based on the input sensor signal is stored in the target illuminance storage unit 12 as the target illuminance. Once the target illuminance is set, the lighting device 2 decreases the dimming ratio if the sensor output of the brightness sensor 3 exceeds the target illuminance, and increases the dimming ratio if the sensor output falls below the target illuminance. Since the dimming ratio is feedback-controlled so that the sensor output matches the target illuminance, the illuminance on the irradiated surface is kept constant by such feedback control.

  The lighting device 2 is provided with a reflectance detection means for detecting the reflectance of the irradiated surface and a target illuminance setting means. When the reflectance of the irradiated surface changes due to a layout change or the like, the target illuminance is restored. Some can be set (see, for example, Patent Document 2). The reflectance detection means monitors the sensor signal of the brightness sensor 3 while the power is turned on, and detects the reflectance of the irradiated surface based on the light output level of the light source 4 and the sensor signal. When the reflectance detection means detects that the reflectance of the irradiated surface has changed, the target illuminance setting means calculates an appropriate target illuminance based on the light output level of the light source 4 and the sensor signal, and the target illuminance is set. Since the target illuminance stored in the storage unit 12 is updated, even when the reflectance of the irradiated surface is changed by changing the layout after setting the target illuminance at the time of construction, the user can control the remote control transmitter in the same manner as at the time of construction. Even if the operation for resetting the target illuminance by operating 7 is not performed, the illuminance of the irradiated surface can be kept constant before and after the layout change.

Japanese Patent Laid-Open No. 9-69391 JP 2004-234910 A

  In the conventional lighting fixtures described above, the target illuminance is reset by detecting the reflectivity of the irradiated surface every time the power is turned on, even if the reflectivity of the irradiated surface changes due to a layout change or the like. Although the illuminance of the irradiated surface is kept constant, there is a case where the target illuminance is not set correctly in a lighting fixture that is used only in the daytime when external light exists.

  That is, in a lighting fixture that is turned on only during the daytime, there is reflected light in which external light is reflected on the irradiated surface in addition to reflected light reflected on the irradiated surface from the light source. Therefore, when the amount of external light increases, the sensor signal of the brightness sensor 3 with respect to the light output of the light source increases. When the sensor signal of the brightness sensor 3 increases even though the light output is constant, it is determined whether this is caused by an increase in the amount of reflected light due to external light or a change in the reflectance of the irradiated surface. There was a problem that the target illuminance could not be set correctly. For example, when it is determined that the sensor signal has increased because the reflectance of the irradiated surface has increased even though the sensor signal of the brightness sensor 3 has increased due to an increase in the amount of external light, the target illuminance has a higher value. Therefore, the light output of the light source becomes larger than necessary, and power saving cannot be achieved.

  In other words, when setting the target illuminance at power-on or during power-on, in order to set an appropriate target illuminance, it is necessary to reset the target illuminance in the absence of external light, and the target illuminance setting is correct. When the target illuminance is updated in an environment where it cannot be performed, there is a problem that the illuminance on the irradiated surface cannot be controlled uniformly while saving power.

  The present invention has been made in view of the above problems, and its object is to stop the setting of the target illuminance in an environment where the setting of the target illuminance cannot be performed correctly, thereby reducing power consumption. An object of the present invention is to provide a lighting apparatus and a lighting system capable of controlling the illuminance of an irradiation surface to be constant.

In order to achieve the above object, the invention of claim 1 includes a lighting device that supplies lighting power to the light source, and the lighting device performs dimming and lighting of the light source with a light output corresponding to the dimming signal. Controls the dimming level so that the brightness level of the illuminated surface detected by the brightness sensor and the target level storage unit that stores the target level of the brightness of the illuminated surface matches the target level A brightness control unit that outputs a dimming signal to the dimming lighting unit, and a target level determined based on the brightness level and dimming signal detected by the brightness sensor and set in the target level storage unit A level setting unit, and a lighting pattern storage unit that stores the correspondence between the brightness level detected by the brightness sensor and the dimming signal as a lighting pattern , and the target level setting unit stops setting the target level It is provided functions Based on the lighting pattern history stored in the lighting pattern storage unit, the target level setting unit sets the target level if the same lighting pattern continues for a predetermined number of times after the lighting pattern changes, and the same lighting pattern is set. Is not continued for a predetermined number of times, the setting of the target level is stopped .

The invention of claim 2 includes a lighting device that supplies lighting power to the light source, and the lighting device is a dimming lighting unit for dimming and lighting the light source with a light output corresponding to the dimming signal, and the brightness of the irradiated surface. A dimming signal for controlling the dimming level so that the brightness level of the illuminated surface detected by the brightness sensor matches the target level. A target level setting unit configured to determine a target level based on a brightness level detected by a brightness sensor and a dimming signal and set the target level in a target level storage unit; The setting unit is provided with a function of stopping the setting of the target level, and the first sensor signal corresponding to the brightness level of the irradiated surface detected by the brightness sensor is input to the target level setting unit. The brightness control unit has the first A second sensor signal obtained by smoothing the sensor signal is input, and the target level setting unit reflects the reflectance of the irradiated surface based on the first sensor signal when the light output is changed at a high frequency. If no change is detected, the setting of the target level is stopped .

According to a third aspect of the present invention, in the first or second aspect of the invention, when the target level setting unit sets the target level, the dimming signal output from the brightness control unit is changed in a predetermined pattern. And a means for notifying that the target level has been set .

The invention of claim 4 is an illumination system comprising a power switch and a plurality of lighting fixtures according to any one of claims 1 to 3 to which power is supplied via the power switch. It is characterized in that one brightness sensor is shared by a plurality of lighting fixtures.

According to the first aspect of the invention, in an environment where the target level cannot be set correctly, the target level setting unit stops setting the target level, thereby preventing the target level from being set correctly. be able to. For example, even in a lighting fixture that is used only in the daytime, by setting the target illuminance in the absence of external light and not setting the target illuminance when there is external light, It is possible to prevent the set target illuminance from being changed. Therefore, even in a lighting fixture that is used only in the daytime, it is possible to perform constant brightness control using outside light and to save power.
Moreover, even in an environment that is used only in the daytime, whether or not the same lighting pattern continues for a predetermined number of times after the lighting pattern changes, whether the lighting pattern change is due to a change in external light quantity, or the reflectance of the irradiated surface It can be determined whether the change is due to the change. When the amount of external light changes, the lighting pattern changes temporarily, and the same lighting pattern does not continue for a predetermined number of times, so the target level setting unit stops setting the target level and the target level is set correctly. It can be prevented from being done. In addition, if it is determined that the change in the lighting pattern is due to a change in the reflectance of the irradiated surface, the target level is set, so before and after the reflectance of the irradiated surface changes due to a layout change or the like. The target level can be set so as to keep the illuminance of the irradiated surface constant, and brightness constant control using outside light can be performed while saving power.

According to the invention of claim 2, in an environment where the target level cannot be set correctly, the target level setting unit prevents the target level from being set correctly by stopping the target level setting. be able to. For example, even in a lighting fixture that is used only in the daytime, by setting the target illuminance in the absence of external light and not setting the target illuminance when there is external light, It is possible to prevent the set target illuminance from being changed. Therefore, even in a lighting fixture that is used only in the daytime, it is possible to perform constant brightness control using outside light and to save power.
In addition, the change in the first sensor signal when the light output is changed at a high frequency does not change depending on the change in the external light amount, but changes when the reflectance of the irradiated surface changes. Even in the environment, it is possible to determine whether or not the reflectance of the irradiated surface has changed based on the first sensor signal when the light output is changed at a high frequency. If the target level setting unit does not detect that the reflectance of the irradiated surface has changed, the target level setting unit stops setting the target level, thereby preventing the target level from being set correctly. In addition, if it detects that the reflectance of the irradiated surface has changed, the target level is set, so that the illuminance of the irradiated surface is kept constant before and after the reflectance of the irradiated surface changes due to a layout change or the like. The target level can be set as described above, and constant brightness control using outside light can be performed while saving power. In addition, since the light output of the light source is changed at a high frequency when detecting the change in reflectance, the change in reflectance can be detected without making the human eye feel the change in illuminance.

According to the invention of claim 3, by changing the light output of the light source in a predetermined pattern, the user can confirm whether or not the target level has been set, thereby preventing erroneous setting of the target level and redoing. be able to.

According to invention of Claim 4 , the illumination system provided with two or more lighting fixtures in any one of Claim 1 thru | or 3 can be provided, and one brightness sensor is shared by several lighting fixtures. Therefore, the number of brightness sensors can be reduced.

The lighting fixture of Embodiment 1 is shown, (a) is a schematic block diagram, (b) is a block diagram. (A) (b) is explanatory drawing explaining arrangement | positioning of the brightness sensor same as the above. (A) is a layout explanatory drawing of a connector same as the above, (b) is an external perspective view showing a state before the connector is connected. It is a circuit diagram which shows the electrical connection state of a brightness sensor same as the above, and a lighting device. The brightness constant control operation described above will be described, wherein (a) is a sensor signal of the brightness sensor, and (b) is a diagram showing a relationship between dimming signals output from the brightness control unit. The setting operation of the target illuminance described above will be described. (A) is an external light quantity, (b) is a dimming signal, (c) is a sensor signal of the illuminance sensor, and (d) is a value obtained by dividing the sensor signal by the dimming signal. It is a figure which shows the relationship. The target illuminance setting operation at the time of layout change is described. (A) is the external light quantity, (b) is the dimming signal S2, (c) is the sensor signal S1 of the illuminance sensor, and (d) is the sensor signal S1. It is a figure which shows the relationship of the value (S1 / S2) divided | segmented with the light control signal S2. (A) (b) is explanatory drawing explaining the timing which starts the setting operation | movement of target illumination intensity. It is a schematic block diagram which shows the other structure same as the above. (A)-(c) is explanatory drawing explaining operation | movement of the lighting fixture of Embodiment 2. FIG. It is a block diagram of the lighting fixture of Embodiment 3. It is explanatory drawing explaining operation | movement same as the above, (a) is an on / off operation of a power switch, (b) is a figure which shows the relationship of the frequency | count of power ON. It is explanatory drawing explaining another operation | movement same as the above, (a) is an on / off operation of a power switch, (b) is a figure which shows the relationship of the frequency | count of power ON. It is explanatory drawing explaining another operation | movement same as the above, (a) is an on / off operation of a power switch, (b) is a figure which shows the relationship of the frequency | count of power ON. It is a block diagram of the lighting fixture of Embodiment 4. It is explanatory drawing explaining operation | movement same as the above, (a) is external light quantity, (b) is light control signal S2, (c) is sensor signal S1 of an illuminance sensor, (d) is sensor signal S1 and light control signal S2. It is a figure which shows the relationship of the value (S1 / S2) divided by. The operation of the above is described, wherein (a) is the maximum value of the dimming signal, (b) is the minimum value of the dimming signal, (c) is the maximum value of the sensor signal, and (d) is the relationship between the minimum value of the sensor signal. FIG. It is a block diagram of the lighting fixture of Embodiment 5. The operation of the above is described, (a) is the light output, (b) is the dimming signal, (c) is the human sensed illuminance, (d) is the output voltage of the light receiving element, and (e) is the output voltage of the filter circuit. It is a figure which shows the relationship. It is a figure which shows the relationship between the light control signal same as the above, and the output voltage of a light receiving element. The relationship between the light control signal same as the above and the output voltage of a light receiving element is shown, (a) is a figure before a reflectance changes, (b) is a figure after a reflectance changes. The relationship between the light control signal same as the above and the output voltage of a light receiving element is shown, (a) is a figure before external light increases, (b) is a figure after external light increases. It is a schematic block diagram of the illumination system of Embodiment 6. The conventional lighting fixture is shown, (a) is a schematic block diagram, (b) is a block diagram of a lighting fixture.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1A is a schematic configuration diagram of a luminaire 1, and the luminaire 1 is used by being attached to a ceiling 101 of a room 100 in a building such as an office building.

  As shown in the block diagram of FIG. 1B, the luminaire 1 includes a lighting device 2, an illuminance sensor 3, and a mode switch 5 as main components.

  The lighting device 2 is connected to a commercial power source AC through a power switch SW such as a wall switch and a power line L1, and receives power from the commercial power source AC to adjust a light source 4 including a discharge lamp such as a fluorescent lamp. A lighting circuit unit 14 for lighting the light, an output control unit 13 for controlling the light output (dimming ratio) of the light source 4 by changing the output of the lighting circuit unit 14 according to a dimming signal, and an EEPROM or a flash memory, for example A target illuminance storage unit (target level storage unit) 12 that stores a target illuminance (target level) of the irradiated surface, and a brightness level of the irradiated surface detected by the illuminance sensor 3. A brightness control unit 11 that outputs a dimming signal for controlling the dimming ratio to the output control unit 13 so that the brightness of the irradiated surface is constant at the target illuminance based on (illuminance), and an illuminance sensor Three And a target illuminance setting unit (target level setting section) 15 for setting a target illuminance storage unit 12 determines a target illuminance on the basis of out illuminance and the dimming signal at that time.

  The mode changeover switch 5 is a switch for switching between an operation mode in which the target illuminance setting unit 15 sets the target illuminance every time the power is turned on and an operation mode in which the target illuminance is set only once. The analog voltage signal S3 having a voltage value corresponding to the switching operation by the user is given to the target illuminance setting unit 15, and the target illuminance setting mode by the target illuminance setting unit 15 is switched to a desired operation mode.

  The illuminance sensor (brightness sensor) 3 detects the illuminance (brightness level) of the surface to be irradiated with the illumination light of the luminaire 1, that is, the floor surface 102 of the room 100 or the top plate of a desk (not shown). The sensor signal which consists of a voltage signal according to the light quantity of the reflected light from a to-be-irradiated surface is output. Here, the illuminance sensor 3 reflects external light C2 incident on the interior of the room 100 through the window 103 in addition to the reflected light reflected by the floor surface 102 from the illumination fixture 1. Reflected light also enters.

  As shown in FIG. 1A, the illuminance sensor 3 is disposed on the lower surface of the fixture body 20 that houses the lighting device 2 and the light source 4. 2 (a) and 2 (b) show a specific example of the mounting position of the illuminance sensor 3, and as shown in FIG. 2 (a), the lighting device 2 is arranged inside the mountain-shaped reflecting plate 20a, and both sides of the reflecting plate 20a. In the two-lamp type lighting fixture 1 in which the light source 4 composed of a straight tube fluorescent lamp is arranged, the illuminance sensor 3 and the mode switch 5 are arranged on the top (lowermost part) of the mountain-shaped reflector 20a. In addition, as shown in FIG. 2B, in the one-lamp type lighting fixture 1 in which the light source 4 made of a straight tube fluorescent lamp is arranged on the top (lowermost part) of the mountain-shaped reflector 20a, the reflector 20a The illuminance sensor 3 and the mode changeover switch 5 are arranged on any one of the surfaces.

  Here, the electrical connection between the illuminance sensor 3 and the lighting device 2 is provided in the vicinity of the power supply terminal block 22 on the substrate 21 of the lighting device 2, as shown in FIGS. This is done by connecting the plug connector 23a on the illuminance sensor 3 side to the socket connector 23b.

  When the illuminance sensor 3 is directly attached to the substrate 21 with solder or the like, it is necessary to pack the illuminance sensor 3 and the lighting device 2 together. In this embodiment, the illuminance sensor 3 is connected to the lighting device 2 by a connector. Therefore, the lighting device 2 and the illuminance sensor 3 can be packed separately, and there is an advantage that it is easy to pack. Further, since the socket connector 23b on the board side is provided in the vicinity of the power line terminal block 22 on the board 21, when the power line L1 is connected to the power line terminal block 22, the illumination sensor 3 The work of connecting the plug connector 23a provided on the cable to the socket connector 23b on the board side can be performed together, and there is an advantage that workability is improved. Note that reference numeral 24 in FIG. 3B denotes a lamp wire connection terminal for connecting an electric wire from a lamp socket holding the base of the light source 4.

  By the way, in the case of the connector connection, when vibration is applied and the plating of the terminal portions of the connectors 23 (consisting of the plug connector 23a and the socket connector 23b) a and 23b is peeled off, an oxide film is formed on the portions, causing poor conduction. Although there is a possibility, for example, as shown in FIG. 4, the connectors 23a and 23b are connected to the ground line and the terminal P1 connected to the voltage line Vcc separately from the terminal P2 for signal output of the illuminance sensor 3. Terminal P3, and by connecting resistor R1 between terminals P1-P2 and resistor R2 between terminals P2-P3, a current of several mA to several tens of mA is constantly applied between the terminals of connectors 23a and 23b. If it is made to flow, even if an oxide film is formed due to peeling of the plating or the like, a conduction failure due to the oxide film is prevented, and the sensor signal of the illuminance sensor 3 is turned on by the lighting device. It can be output to the side.

  Next, operation | movement of the lighting fixture 1 is demonstrated. First, the constant brightness control operation by the brightness control unit 11 will be described with reference to FIGS. 5A shows the sensor signal S1 of the illuminance sensor 3, and FIG. 5B shows the dimming signal S2 output from the brightness control unit 11.

  When the power switch SW is turned on and the lighting apparatus 1 is turned on, the brightness control unit 11 of the lighting device 2 reads the target illuminance from the target illuminance storage unit 12. The target illuminance setting operation will be described later. When reading of the target illuminance is completed, the brightness control unit 11 takes in the sensor signal S1 from the illuminance sensor 3, and controls the dimming ratio so that the illuminance of the irradiated surface detected by the illuminance sensor 3 matches the target illuminance. The light control signal for performing the control is output to the output control unit 13.

  Here, in each period of time t0 to t1, time t2 to t3, and time t7 to t8 in FIG. 5, the illuminance S1 detected by the illuminance sensor 3 is within the target illuminance range (illuminance lower limit Lmin ≦ S1 ≦ illuminance upper limit. Lmax), the brightness control unit 11 holds the signal level of the dimming signal at the current value.

  On the other hand, when the detected illuminance S1 of the illuminance sensor 3 exceeds the upper limit Lmax of the target illuminance because the amount of reflected light from the irradiated surface has increased due to the influence of external light or the like at times t1 to t2 and t3 to t5. (S1> Lmax), the brightness control unit 11 gradually decreases the dimming signal output to the output control unit 13 so as to gradually decrease the dimming ratio. When the dimming ratio is lowered, the light output of the light source 4 is lowered accordingly, and the amount of reflected light from the irradiated surface is also reduced, so that the sensor voltage value is lowered. Note that the dimming signal output from the brightness control unit 11 at time t4 decreases to the dimming lower limit value, but since the detected illuminance S1 exceeds the dimming upper limit value Lmax also at time t4 to t5, this period Then, the dimming signal is held at the dimming lower limit. Further, since the detected illuminance S1 is within the range of the target illuminance at times t5 to t6, the dimming signal is held at the dimming lower limit value even during this period.

  Contrary to the above, since the detected illuminance S1 of the illuminance sensor 3 is darker than the lower limit Lmin of the target illuminance in each period of time t6 to t7 and time t8 to t10 (S1 <Lmin), brightness control is performed. The unit 11 gradually increases the dimming signal output to the output control unit 13 so as to gradually increase the dimming ratio. When the dimming ratio is increased, the light output of the light source 4 increases accordingly, and the amount of reflected light from the irradiated surface increases, so that the sensor voltage value decreases. Note that the dimming signal output from the brightness control unit 11 at time t9 increases to the dimming upper limit value, but the detected illuminance S1 is darker than the dimming lower limit value Lmin at times t9 to t10. In this period, the dimming signal is held at the dimming upper limit value. Since the brightness level S1 is within the target illuminance range after time t10, the dimming signal is held at the dimming upper limit value even during this period.

  The brightness control unit 11 performs the constant brightness control as described above, and even if the dimming signal output from the brightness control unit 11 is saturated at the upper limit value or the lower limit value due to the influence of outside light or the like, Unless the sensor signal S1 of the illuminance sensor 3 temporarily falls within the target illuminance range, the brightness level of the irradiated surface is maintained within the target illuminance range. Therefore, when there is outside light, the brightness can be controlled to be constant while reducing the light output while saving power.

  Next, the target illuminance setting operation by the target illuminance setting unit 15 will be described with reference to FIG. When the power switch SW is turned on at time t0 in the daytime to turn on the lighting fixture 1, and when the power switch SW is turned off at time t4 when there is no external light at night, the period from time t0 to t1 The brightness control unit 11 controls the brightness of the irradiated surface to be constant by reducing the dimming signal S2 in accordance with the increase in the amount of external light. On the other hand, when the dimming signal S2 is saturated at the dimming lower limit value at time t1, the light output of the light source 4 cannot be further reduced. Therefore, during the period from the time t1 to the time t2, irradiation is performed according to the increase in the amount of external light. The illuminance detected by the illuminance sensor 3 exceeds the target illuminance by the amount that the brightness of the surface increases and the amount of external light increases. Thereafter, as the night approaches, the amount of external light decreases, and when the dimming signal S2 output from the brightness control unit 11 exceeds the dimming lower limit at time t2, brightness constant control by the brightness control unit 11 is performed. Thus, the illuminance detected by the illuminance sensor 3 is controlled to a predetermined target illuminance. When the amount of external light becomes substantially zero at time t3, the dimming signal output from the brightness control unit 11 becomes the dimming signal upper limit value, and the illuminance of the illuminated surface with only the illumination light of the light source 4 is a predetermined target. Controlled by illuminance.

  Here, in the target illuminance setting unit 15 of the lighting device 2, the sensor signal S <b> 1 output from the illuminance sensor 3 and the dimming output from the brightness control unit 11 while the power is supplied to the lighting device 2. The signal S2 is monitored, and a sample value (S1 / S2) obtained by dividing the sensor signal S1 by the dimming signal S2 is acquired and stored in a memory (not shown) at predetermined time intervals. When obtaining a sample value of the value obtained by dividing the sensor signal S1 by the dimming signal S2 (S1 / S2), the sensor signal S1 when the curtain is shaken or the object is moved below the illuminance sensor 3 is used. If the sample value is used and the target illuminance may be an unintended value due to the influence of disturbance, for example, one minute of the value of (S1 / S2) acquired every second is averaged. Then, the averaged value may be used as the sample value, and the influence of disturbance can be reduced.

  Then, the target illuminance setting unit 15 obtains the minimum value from the sample value (S1 / S2) acquired while the power is turned on, and uses the value obtained by multiplying the minimum value by the upper limit value of the dimming signal as the reference (median value). A predetermined voltage range (upper limit value and lower limit value of target illuminance) is stored in the target illuminance storage unit 12 as a new target illuminance range. In this embodiment, the target illuminance storage unit 12 stores the upper limit value and the lower limit value of the target illuminance. However, the target illuminance storage unit 12 stores only the lower limit value of the target illuminance, and the upper limit value of the target illuminance is The brightness control unit 11 may calculate by adding a predetermined change width to the lower limit value, or the target illuminance storage unit 12 stores only the upper limit value of the target illuminance. The control unit 11 may calculate by subtracting a predetermined change width from the upper limit value.

  In the example of FIG. 6, the value obtained in the period D1 is the minimum value of (S1 / S2), and the sensor signal S1 of the illuminance sensor 3 when the dimming signal S2 becomes the upper limit value in the absence of external light is The median value of the target illuminance. That is, when used in a situation where there is no external light even during power-on, the minimum value of the value (S1 / S2) obtained by dividing the sensor signal S1 of the illuminance sensor 3 by the dimming signal S2 is acquired, and If the target illuminance is obtained by performing the above calculation, the light output is maximized (maximum dimming signal value) by performing constant brightness control at the next power-on using the target illuminance obtained this time, and external light Brightness constant control can be performed at the brightness level of the irradiated surface when no is present (brightness level in the period D1 in FIG. 6).

  Next, an operation when the reflectance of the irradiated surface is changed due to a layout change or the like will be described with reference to FIG. Here, a description will be given by taking as an example a case where the irradiated surface is changed to one having a high reflectance in the period D2 during power-on, for example, from a gray desk to a white desk. By changing the reflectance of the illuminated surface to a high one, the reflected light of the illuminated surface with respect to the illumination light from the light source increases, so even if the light output is constant, the illuminance sensor 3 before and after the reflectance is changed. The sensor signal is different. Therefore, if constant brightness control is performed using the target illuminance set when the power was last turned on (that is, the target illuminance before the layout change), even if there is no outside light at night, Since the reflectance is high, the sensor signal of the illuminance sensor 3 matches the target illuminance when the light output is less than or equal to the upper limit value of the dimming signal, and the light output of the upper limit value of the dimming signal cannot be obtained. . Here, the value (S1 / S2) obtained by dividing the sensor signal S1 of the illuminance sensor 3 by the dimming signal S2 becomes the minimum value in the period D3 when there is no external light. In the target illuminance setting unit 15, (S1 / S2) is stored in the target illuminance storage unit 12 as a new target illuminance range using a predetermined voltage range based on a value obtained by multiplying the value of / S2) by the upper limit value of the dimming signal S2 as a new target illuminance range. Brightness constant control can be performed at the brightness level of the irradiated surface when the output is maximum (the light control signal maximum value) and there is no external light.

  As described above, when there is no layout change and the reflectance of the irradiated surface does not change (see FIG. 6), a value (S1 / S2) obtained by dividing the sensor signal S1 of the illuminance sensor 3 by the dimming signal S2 is obtained. Since the minimum value is when the dimming signal S2 reaches the upper limit value, multiplying the value of (S1 / S2) by the upper limit value of the dimming signal S2 maximizes the light output and the outside light. The illuminance (brightness) of the irradiated surface when there is no light can be obtained as the target illuminance, and therefore the brightness is controlled at the brightness level of the irradiated surface when the light output is maximum and there is no external light. It can be performed. The same applies to the case where the reflectance of the irradiated surface changes due to a layout change or the like during power-on (see FIG. 7). The value obtained by dividing the sensor signal S1 of the illuminance sensor 3 by the dimming signal S2 (S1 / S2) After the minimum value is obtained, the minimum value is multiplied by the upper limit value of the dimming signal S2, so that the brightness is controlled at the brightness level of the illuminated surface when the light output is maximum and there is no external light. So that the target illuminance can be changed. Therefore, even when the reflectivity of the irradiated surface is changed due to a layout change or the like, the target illuminance can be changed to an appropriate value, and power can be saved while maintaining the brightness of the irradiated surface constant. it can.

  Here, in the target illuminance setting operation described above, the target illuminance setting unit 15 sequentially monitors the sensor signal S1 of the illuminance sensor 3 and the dimming signal S2 of the brightness control unit 11, and sets the target illuminance. The target illuminance setting unit 15 monitors the sensor signal S1 and the dimming signal S2, reads the mode switching signal S3 from the mode switch 5, and sets the target illuminance according to the mode switching signal S3. It has a function to stop. The mode changeover switch 5 sets the target illuminance setting mode by the target illuminance setting unit 15, the automatic setting mode for automatically setting the target illuminance, and the target illuminance is fixed after the target illuminance is set only once. This is for switching to one of the target fixed modes.

  When the setting mode is switched to the automatic setting mode using the mode switch 5, the target illuminance setting unit 15 automatically performs processing for setting the target illuminance according to the setting content of the mode switching signal S <b> 3 and sequentially. Brightness constant control is performed using the automatically updated target illuminance.

  On the other hand, when the setting mode is switched to the target fixed mode using the mode changeover switch 5, the target illuminance setting unit 15 performs the process of setting the target illuminance only once according to the setting content of the mode switching signal S3. Thereafter, the setting operation of the target illuminance is stopped, and constant brightness control is performed with the same target illuminance. Therefore, when the target fixed mode is set using the mode switch 5, when the user turns on the power switch SW and supplies power to the lighting device 2 without external light when the power is turned on for the first time, Since the target illuminance is set by the target illuminance setting unit 15 at the time, and the setting of the target illuminance is stopped thereafter, the brightness of the irradiated surface when there is no external light and the light output is maximum is set as the target illuminance. Brightness constant control can be performed.

  Thus, in an environment where the target level cannot be set correctly, the target level setting unit 15 can prevent the target level from being set correctly by stopping the target level setting. For example, even in a lighting fixture that is used only in the daytime, by setting the target illuminance in the absence of external light and not setting the target illuminance when there is external light, It is possible to prevent the set target illuminance from being changed. Therefore, even in a lighting fixture that is used only in the daytime, it is possible to perform constant brightness control using outside light and to save power. Furthermore, since the target illuminance setting unit 15 stops or permits the target level setting according to the output signal from the mode switch 5 that switches the output according to the operation, the user intends to stop the target level setting. Can be done at the timing.

  Since the target illuminance is not set when the power is turned on for the first time, the brightness control unit 11 does not perform constant brightness control and the light source 4 is turned on at the upper limit value of the dimming signal. Based on the sensor signal S1 of the sensor 3, the target illuminance can be set appropriately. Further, when the power-on time is short and the number of samples of the value (S1 / S2) is smaller than the predetermined number, the target illuminance setting unit 15 may not perform the target illuminance setting process.

  The operation when the user switches the setting mode to the target fixed mode using the mode switch 5 is as follows. After the switching operation of the mode switch 5 is performed at time t1, as shown in FIG. At the next power-on (time t2), the target illuminance setting unit 15 may start the setting operation in the target fixed mode, or the mode changeover switch 5 is switched as shown in FIG. 8B. At time t1, the target illuminance setting unit 15 may start the setting operation in the target fixed mode.

  In the present embodiment, the illuminance sensor 3 and the mode changeover switch 5 are provided in the fixture body 20 of the lighting fixture 1, but as shown in FIG. 9, the illuminance sensor is provided in the sensor body 30 provided separately from the fixture body 20. 3 and the mode change-over switch 5 may be provided.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. The lighting fixture 1 of this embodiment adds the alerting | reporting function which alert | reports a setting completion to a user when the target illumination intensity is set to the lighting fixture demonstrated in Embodiment 1. FIG. In addition, since the lighting fixture 1 of this embodiment has the structure similar to the lighting fixture 1 demonstrated in Embodiment 1, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted. . In addition, since the constant brightness control and the operation for setting the target illuminance are the same as those in the first embodiment, description of these operations will be omitted.

  10A to 10C show the dimming signal when the setting operation of the target illuminance is completed. At time t0, the user turns on the power switch SW, and the lighting device 2 is turned on. Then, the target illuminance setting unit 15 monitors the sensor signal S1 and the dimming signal S2 of the illuminance sensor 3, and obtains a value (S1 / S2) obtained by dividing the sensor signal S1 by the dimming signal S2 every predetermined time. A sample value is acquired and stored in a memory (not shown). Thereafter, when the number of samples acquired at time t1 reaches a predetermined number, the target illuminance setting unit 15 determines that the setting of the target illuminance is completed, and outputs a signal indicating the setting completion to the brightness control unit 11, In response to this signal, the brightness controller 11 instantaneously reduces the dimming signal S2, and informs the user that the setting of the target illuminance has been completed by instantaneously reducing the light output of the light source 4. can do.

  As described above, when the brightness control unit 11 determines that the setting of the target illuminance is completed, the light output of the light source 4 is changed in a predetermined pattern, so that the user can change the target from the brightness change of the light source 4. It can be confirmed whether or not the illuminance setting is completed. Accordingly, when the target illuminance is set, the power-on time is insufficient, and the number of samples (S1 / S2) obtained by dividing the sensor signal S1 of the illuminance sensor 3 by the dimming signal S2 does not reach the predetermined number. After that, it is possible to eliminate the situation where the target illuminance is set again by repeating the same operation once again.

  The brightness control unit 11 performs the notification operation by instantaneously reducing the light output of the light source 4. However, as shown in FIG. S2 may be changed, or after the dimming signal is once lowered as shown in FIG. 10C, the dimming signal S2 is changed so as to fade to the original signal level. Similarly to the above, the user can confirm whether or not the target level has been set, and it is possible to prevent erroneous setting of the target level and re-execution.

  Also in other embodiments described later, as in the present embodiment, when the setting of the target illuminance is completed, the brightness control unit 11 changes the light output of the light source 4 in a predetermined pattern, so that the target illuminance is set. You may make it alert | report that the setting of (1) was completed.

(Embodiment 3)
Embodiment 3 of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram of the lighting fixture 1 of the present embodiment. In this embodiment, instead of the mode selector switch 5, a power source detection unit 6 that detects the presence or absence of power supply to the lighting device 2 is provided, and the target illuminance setting unit 15 turns on / off the power supply detected by the power source detection unit 6. Based on the off pattern, the target illuminance setting is stopped when the power switch SW is not turned on / off in a predetermined operation procedure, and the target illuminance is set only when the on / off operation is performed in the predetermined operation procedure. Settings are being made. In addition, since structures other than the power supply detection part 6 are the same as that of the lighting fixture 1 demonstrated in Embodiment 1 or 2, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted. In addition, since the constant brightness control and the operation for setting the target illuminance are the same as those in the first embodiment, description of these operations will be omitted.

  The operation | movement at the time of the lighting fixture 1 of this embodiment starting the setting of target illumination intensity is demonstrated based on FIG. The power source detection unit 6 monitors on / off of power feeding, and outputs a signal indicating the on state of power feeding to the target illuminance setting unit 15. The target illuminance setting unit 15 sets the target illuminance based on the detection result of the power supply detection unit 6 if the power ON time Ton while turning on / off the power switch SW is within a predetermined range (T1 or more and T2 or less). It is determined that the power-on condition for starting the setting is established, 1 is added to the number of power-on times, and the target illuminance storage unit 12 stores the result. Note that the initial value of the number of times the power is turned on is set to zero.

  Thereafter, when the power switch SW is turned off and then turned on again, the target illuminance setting unit 15 reads the number of times the power is turned on stored in the target illuminance storage unit 12 based on the detection result of the power detection unit 6. When the ON / OFF operation of the power switch SW is continuously detected so that the power ON time Ton falls within the predetermined range, the value of the power ON count is incremented from once to twice to three times. Then, on / off operation of the power switch SW such that the power ON time Ton falls within a predetermined range is detected, for example, 6 times continuously, and when the number of times of power ON is 6, the target illuminance setting unit 15 sets the target illuminance. It is determined that the setting condition is satisfied, and the target illuminance is set only once at time t1 when the power switch SW is turned on next time.

  Then, the target illuminance setting unit 15 executes a process of setting the target illuminance when the number of power ON times reaches a predetermined number so that the power ON time Ton is within the predetermined range, or the power ON time Ton is within the predetermined range. If the on / off operation is not performed continuously for a predetermined number of times, the number of power ON times is reset to zero.

  Here, as shown in FIG. 13, when the power ON time Ton becomes longer than the predetermined range at time t1 (Ton> T2), the target illuminance setting unit 15 determines that the predetermined on / off operation has not been performed. When the power ON count is reset to zero and thereafter an ON / OFF operation in which the power ON time Ton is within a predetermined time is detected, the power ON count is incremented from 1.

  As shown in FIG. 14, when the power ON time Ton becomes shorter than the predetermined range at times t1 and t2 (Ton <T1), the target illuminance setting unit 15 does not increment the power ON count and the power ON count Is not reset, the count value of the power-on count is held, and if the power-on time Ton of a predetermined time width is detected after that, the power-on count is incremented again.

  As described above, the target illuminance setting unit 15 stops setting the target illuminance when the power switch SW is not operated according to a predetermined operation procedure based on the detection result of the power supply detection unit 6, and the power switch SW is When the operation is performed according to the operation procedure, the target illuminance setting operation is being executed, so that the target illuminance setting operation can be stopped at a timing intended by the user. Therefore, in an environment where the target illuminance cannot be set correctly, the target illuminance setting unit 15 can prevent the target level from being set correctly by stopping the target level setting. Even in lighting fixtures that are only used, the target illuminance is set in a state where there is no external light, and the target illuminance is not set when there is external light. It is possible to prevent the target illuminance from being changed. Therefore, even in a lighting fixture that is used only in the daytime, it is possible to perform constant brightness control using outside light and to save power. Moreover, since the setting of the target illuminance is stopped by the operation procedure of the power switch SW, there is an advantage that it is not necessary to add a new part in order to stop the setting of the target illuminance.

  In the present embodiment, the mode switch 5 described in the first embodiment is provided together with the power detection unit 6, and a predetermined on / off operation of the power switch SW is detected based on the detection result of the power detection unit 6. Alternatively, the setting of the target illuminance may be started when the mode switch 5 is operated, or both.

(Embodiment 4)
Embodiment 4 of this invention is demonstrated based on drawing.

  FIG. 15 shows a block diagram of the lighting fixture 1 of the present embodiment. In the lighting fixtures of Embodiments 1 and 2 described above, the setting of the target illuminance by the target illuminance setting unit 15 is stopped or permitted using the mode changeover switch 5, whereas in this embodiment, a lighting pattern is detected. A lighting pattern detection unit 16 is provided, and it is determined whether or not the reflectance of the irradiated surface has changed based on the change of the lighting pattern, and the target illuminance is set only once only when the reflectance of the irradiated surface has changed. To do. In addition, since structures other than the lighting pattern detection unit 16 are the same as those of the lighting fixtures of Embodiments 1 and 2, common constituent elements are denoted by the same reference numerals, and description thereof is omitted. The constant brightness control operation and the target level setting operation of the luminaire 1 are the same as those described in the first embodiment, and a description thereof will be omitted.

  FIG. 16 shows the amount of external light, dimming signal S2, and illuminance when the lighting device 2 is used in an environment where there is always outside light from the time t1 when the power to the lighting device 2 is turned on to the time t4 when the power is stopped. A change in the value (S1 / S2) obtained by dividing the sensor signal S1 of the sensor 3 and the sensor signal S1 by the dimming signal S2 is shown.

  The lighting pattern detection unit 16 monitors the sensor signal S1 from the illuminance sensor 3 and the dimming signal S2 output from the brightness control unit 11 during the power-on period, and the maximum value of the sensor signal S1. Parameters such as the minimum value and the maximum value and minimum value of the dimming signal S2 are stored in the target illuminance storage unit 12. When the power is turned on next time, the lighting pattern detection unit 16 monitors the sensor signal S1 and the dimming signal S2 in the same manner as described above, and the maximum and minimum values of the sensor signal S1 and the maximum of the dimming signal S2. The value and the minimum value are acquired, and the values of these parameters (the maximum value and the minimum value of the sensor signal S1, the maximum value and the minimum value of the dimming signal S2) are stored in the target illuminance storage unit 12. Then, the target illuminance setting unit 12 compares the value of each parameter detected this time by the lighting pattern detection unit 16 with the past value of each parameter stored in the target illuminance storage unit 12, thereby changing the lighting pattern. It is determined whether or not. Here, in this embodiment, the target illuminance storage unit 15 also serves as a lighting pattern storage unit that stores a lighting pattern.

  As a result of comparing the values of each parameter, the target illuminance setting unit 15 determines that the lighting pattern has changed due to a change in an external factor if any parameter has changed. Here, changes in external factors include a case where the reflectance of the irradiated surface changes due to a layout change, a case where the curtain is closed for a predetermined time, and a case where the external light amount decreases due to cloudy weather.

  Even after it is determined that the lighting pattern has changed due to a change in the external factor from the change in the parameter, the lighting pattern detection unit 16 sequentially monitors the sensor signal S1 and the dimming signal S2 each time the power is turned on. Get the value of each parameter. When the predetermined number of times of power-on and all parameters are the same, the target illuminance setting unit 15 determines that the reflectance of the irradiated surface has changed because the same lighting pattern has continued after the lighting pattern has changed. When the power is turned on next time, the target illuminance is set only once. On the other hand, even if the lighting pattern changes, if the same lighting pattern does not continue for a predetermined number of times, the target illuminance setting unit 15 determines that the lighting pattern has temporarily changed due to a change in external light, and the target illuminance is set. Stop the setting.

  For example, as shown in FIG. 17, in an environment where the lighting device 2 is turned on once a day, if a predetermined number of times of turning on the power is set to three, a change occurs after any parameter changes. If the subsequent parameters continue for three consecutive days, the target illuminance is reset on the fourth day. In the example shown in FIG. 17, the lighting pattern changes from the first to the fifth time, but since the same parameter continues for three days from the fifth time, the reflectance changes at the end of the seventh time. The target illuminance is reset when the power is turned on next time. This makes it possible to determine whether the change in the lighting pattern is a temporary change due to a change in the amount of external light or a change in the reflectivity of the irradiated surface due to the layout change. The target illuminance is reset only when it is performed.

  As described above, even in an environment that is used only in the daytime, whether or not the same lighting pattern continues for a predetermined number of times after the lighting pattern changes, whether the lighting pattern change is due to a change in external light amount, or the irradiated surface It is possible to reliably determine whether the reflectance is changed. When the external light quantity changes, the lighting pattern changes temporarily, and the same lighting pattern does not continue for a predetermined number of times. In this case, the target illuminance setting unit 15 stops setting the target illuminance, It is possible to prevent that the setting of is not performed correctly. Further, when it is determined that the change in the lighting pattern is due to the change in the reflectance of the irradiated surface, the target illuminance setting unit 15 sets the target illuminance. The target illuminance can be set so as to keep the illuminance of the irradiated surface constant before and after the reflectance changes, and constant brightness control using external light can be performed while saving power.

(Embodiment 5)
A fifth embodiment of the present invention will be described with reference to FIGS. In the luminaire of the first embodiment, the setting of the target illuminance by the target illuminance setting unit 15 is stopped or permitted using the mode changeover switch 5, whereas in the present embodiment, it is not felt by human eyes. Based on the dimming signal when the light output is changed at a frequency of 5 and the sensor signal of the illuminance sensor 3, it is determined whether or not the reflectance of the irradiated surface has changed, and it is determined that the reflectance has changed. The target illuminance is set only once when it is done. In addition, since structures other than the illuminance sensor 3 are the same as those of the lighting fixture 1 described in the first and second embodiments, common constituent elements are denoted by the same reference numerals and description thereof is omitted. Moreover, since the brightness constant control by the lighting fixture 1 is the same as that of the lighting fixture demonstrated in Embodiment 1, 2, the description is abbreviate | omitted.

  FIG. 18 is a schematic configuration diagram of the luminaire 1 of the present embodiment, in which the illuminance sensor 3 outputs an analog voltage (first sensor signal S4) corresponding to the amount of light received, and an RC filter circuit, for example. And a filter circuit 3b for outputting a second sensor signal S5 obtained by smoothing the sensor signal S4 output from the light receiving element 3a. The target illuminance setting unit 15 sets the target illuminance based on the first sensor signal S4 output from the light receiving element 3a and the dimming signal S2 output from the brightness control unit 11. The brightness control unit 11 stores the brightness (illuminance) of the irradiated surface indicated by the sensor signal S5 in the target illuminance storage unit 12 based on the second sensor signal S5 output from the filter circuit 3b. The dimming signal S2 is output so as to match the set target illuminance.

  Here, a method for detecting a change in reflectance of the irradiated surface due to a layout change or the like will be described with reference to FIG.

  As shown in FIG. 19B, the brightness control unit 11 adjusts the dimming signal Ou (= Oc), for example, to have a value of ± 20% of the dimming signal Oc so that the light output of the light source 4 becomes the target value Lc. × 1.2) and Od (= Oc × 0.8) are alternately output at a predetermined time interval T (for example, 0.1 ms) (see FIG. 19B). At this time, as shown in FIG. 19A, the light output of the light source 4 is alternated between a period in which the light output is Lu and a period in which the light output is Ld at a predetermined time interval T (0.1 ms). However, since the human eye cannot sense the change in brightness that changes at a high frequency of 10 kHz, the illuminance sensed by the human eye smoothes Lu and Ld as shown in FIG. Lc. Here, the output voltage (sensor signal S4) of the light receiving element 3a is a value obtained by repeating Vu and Vd corresponding to the external light and the light reflected by the light outputs Lu and Ld of the light source 4 at the interval T, and the filter circuit 3b. The output voltage (sensor signal S5) is a voltage Vc obtained by smoothing the voltages Vu and Vd. Note that the frequency at which the light output of the light source 4 is changed is set to a high frequency at which the human eye cannot sense the change in light. The filter circuit 3b has a filter characteristic that can smooth the change of the output voltage of the light receiving element 3a due to the change of the optical output at a high frequency to a constant voltage.

  FIG. 20 shows the relationship between the dimming signal S2 and the output voltage S4 of the light receiving element 3a. When the dimming signal is Ou, Od, the output voltages Vu, Vd of the light receiving element 3a are reflections reflecting external light. When the illuminance by light is Vg and the coefficient including the reflectance of the irradiated surface is k, it is expressed by the following equations (1) and (2).

Vu = k × Ou + Vg (1)
Vd = k × Od + Vg (2)
21A and 21B show the dimming signal S2 and the output voltage S4 of the light receiving element 3a when the reflectance of the irradiated surface changes from k1 to k2 (k1 <k2) before and after the layout change. It is a figure which shows a relationship, The figure (a) is a figure before layout change, and the figure (b) is a figure after layout change. FIGS. 22A and 22B are diagrams showing the relationship between the dimming signal S2 and the output voltage S4 when the illuminance due to the reflected light reflected from the external light changes from Vg1 to Vg2 due to the change in the external light quantity. FIG. 5A is a diagram before the outside light is changed, and FIG. 5B is a diagram after the outside light is changed.

  Thus, when the dimming signal S2 output from the brightness control unit 11 is changed at two points Ou and Od, the illuminances Vg, Vg1, and Vg2 due to the reflected light of the outside light are proportional to the dimming signal. Since the target illuminance setting unit 15 detects the detection voltages Vu and Vd of the light receiving element 3a when the dimming signal is changed at two points Ou and Od, the target illuminance setting unit 15 detects the reflectance and the external light. The illuminance by reflected light can be obtained, and it can be detected whether or not the reflectance of the irradiated surface has changed. Note that the same can be said when both the change in the external light amount and the change in the reflectance of the irradiated surface are changed at the same time. After the illuminance and the reflectivity change due to external factors, the dimming signal is output at two points Ou and Od. By detecting the detection voltages Vu and Vd of the light receiving element 3a when changed by the above, a change in reflectance can be detected.

  In addition, although the basic operation | movement of brightness fixed control by the lighting fixture 1 is the same as that of the lighting fixture 1 demonstrated in Embodiment 1, in the lighting fixture 1 of Embodiment 1, the sensor voltage S4 of the illumination intensity sensor 3 is target illumination intensity. The dimming signal when controlling the dimming signal is Oc so that the lower limit value is equal to or higher than the lower limit value and lower than the upper limit value (lower limit value of target illuminance ≦ sensor voltage S4 ≦ upper limit value of target illuminance). The output is the output voltage S5 of the filter circuit 3b. This is because when the output voltage of the light receiving element 3a is input to the brightness control unit 11, the brightness control is performed when the output voltage S4 of the light receiving element 3a when the dimming signal is Ou, Od does not fall within the target illuminance range. Since the dimming signal Oc output from the unit 11 goes up and down each time, and the desired reflectance detection operation cannot be performed, in this embodiment, the sensor signal obtained by smoothing the sensor output S4 of the light receiving element 3a by the filter circuit 3b. S5 is input to the brightness control unit 11. In this embodiment, the values of Ou and Od are set to ± 20% of the dimming signal Oc so that the human sensed illuminance is Lc. However, the target illuminance is obtained by using the light receiving element 3a having good detection sensitivity. If the dimming signals Ou and Od are determined so as to be within the range, the filter circuit 3b can be eliminated.

  In addition, the operation for setting the target illuminance is different from the lighting fixture 1 described in the first embodiment, and when the target illuminance setting unit 15 detects the change in the reflectance by the above-described method, the reflectance after the change, Since the illuminance due to an external factor can be obtained, the target illuminance is set so that the brightness is constant before and after the reflectance changes.

  Here, the target illuminance before the change of the reflectance is Vt, the reflectance of the irradiated surface is k, the illuminance by the external light is Vg, the reflectance of the irradiated surface after the reflectance is changed is k ′, the external light If the illuminance by Vg ′ is Vg ′, the target illuminance Vt ′ after the change in reflectance is expressed by the following equation.

Vt ′ = (Vt−Vg) × k ′ / k + Vm ′ (3)
As described above, even when the reflectance of the irradiated surface changes due to a layout change or the like, the target illuminance setting unit 15 sets the target illuminance according to the above equation (3), so that the reflectance is changed before and after the reflectance changes. The target illuminance can be set so that the illuminance on the irradiated surface is kept constant. Further, the target illuminance setting unit 15 stops setting the target illuminance when a change in reflectance cannot be detected.

  As described above, the amount of change in the first sensor signal S4 when the light output is changed at a high frequency does not change depending on the change in the external light amount, but changes when the reflectance of the irradiated surface changes. Even in an environment where only light is used, the target illuminance setting unit 15 can determine whether or not the reflectance of the irradiated surface has changed based on the first sensor signal S4 when the light output is changed at a high frequency. If the target illuminance setting unit 15 does not detect that the reflectance of the irradiated surface has changed, the target illuminance setting unit 15 stops setting the target level, so that it is possible to prevent the target level from being set correctly. Further, the target illuminance setting unit 15 sets the target level when it detects that the reflectance of the irradiated surface has changed, so that the irradiated surface before and after the reflectance of the irradiated surface changes due to a layout change or the like. The target level can be set so as to keep the illuminance constant, and the brightness constant control using the outside light can be performed while saving power. In the present embodiment, since the light output of the light source 4 is changed at a high frequency when detecting the change in reflectance, it is possible to detect the change in reflectance without making the human eye feel a change in illuminance. it can.

  In this embodiment, the illuminance sensor 3 includes the filter circuit 3b. However, the filter circuit 3b may be provided as an external circuit of the illuminance sensor 3, and the brightness control unit 11 may perform an averaging process or the like. By incorporating software for performing filter processing, a dimming signal may be created using the second sensor signal obtained by smoothing the sensor signal of the illuminance sensor 3.

  In the present embodiment, the brightness control unit 11 changes the light output of the light source 4 at a high frequency by alternately outputting the light control signals Ou and Od obtained by increasing / decreasing the light control signal Oc at a predetermined rate. However, for example, two dimming signals O1 and O2 that are different from each other, such as the maximum value Omax and the minimum value Omin of the dimming signal, are set, and the time ratio at which the two dimming signals O1 and O2 are alternately output. By controlling (PWM control), the average value may be controlled to be Oc.

(Embodiment 6)
Below, embodiment of the illumination system provided with two or more lighting fixtures 1 demonstrated in either of Embodiment 1-5 is described based on FIG. In addition, since the structure and operation | movement of the lighting fixture 1 are as having demonstrated in Embodiment 1-5, the description is abbreviate | omitted.

  The lighting system shown in FIG. 23 includes two lighting fixtures 1A and 1B, and one lighting sensor 3 is shared by the two lighting fixtures 1A and 1B. Each lighting fixture 1A and 1B has one illuminance. Brightness constant control is performed using the detected illuminance of the sensor 3.

  Since the illuminance sensor 3 has a light receiving angle θ1 and the illuminance detection range E is limited, the detection range E of the illuminance sensor 3 is used when a plurality of luminaires 1A and 1B share one illuminance sensor 3. It is necessary to install the lighting fixtures 1A and 1B above.

  Therefore, if the illuminance sensor 3 is installed between the luminaires 1A and 1B arranged adjacent to the ceiling 101 such that a plurality of luminaires 1A and 1B exist above the detection range E of the illuminance sensor 3. There is no need to provide one illuminance sensor 3 for each luminaire, and the number of illuminance sensors 3 can be reduced when a plurality of luminaires are installed on one floor.

In this system, two luminaires 1A and 1B share one illuminance sensor 3. However, if the luminaire enters above the detection range E of the illuminance sensor 3, three or more luminaires 1 Two illuminance sensors may be shared.
The lighting fixture includes a lighting device that supplies lighting power to the light source. The lighting device includes a dimming lighting unit that dimms and lights the light source with a light output corresponding to the dimming signal, and brightness of the irradiated surface. A target level storage unit for storing the target level, and a dimming lighting unit for controlling the dimming level so that the brightness level of the irradiated surface detected by the brightness sensor matches the target level And a target level setting unit that determines the target level based on the brightness level detected by the brightness sensor and the dimming signal and sets the target level in the target level storage unit. The section is provided with a function of stopping the setting of the target level.
As a result, in an environment where the target level cannot be set correctly, the target level setting unit can stop the target level from being set correctly by stopping the target level setting. For example, even in a lighting fixture that is used only in the daytime, by setting the target illuminance in the absence of external light and not setting the target illuminance when there is external light, It is possible to prevent the set target illuminance from being changed. Therefore, even in a lighting fixture that is used only in the daytime, it is possible to perform constant brightness control using outside light and to save power.
In the above luminaire, the target level setting unit is characterized in that setting of the target level is stopped or permitted in accordance with an output signal from a switch whose output is switched according to an operation.
Thereby, the setting of the target level can be stopped by the switching operation of the switch, so that the setting of the target level can be stopped at the timing intended by the user.
In the above luminaire, the target level setting unit is characterized in that the setting of the target level is stopped when the power switch for turning on / off the power supply to the lighting device is not operated in a predetermined operation procedure.
Thereby, when the power switch is not operated in a predetermined operation procedure, the target level setting unit has stopped setting the target level, so that the setting of the target level can be stopped at the timing intended by the user. Further, since setting of the target level is stopped by the operation procedure of the power switch, there is an advantage that it is not necessary to add a new part to stop the setting of the target level.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Lighting device 3 Illuminance sensor (brightness sensor)
4 Light source 5 Mode change switch 11 Brightness control unit 12 Target illuminance storage unit (target level storage unit)
13 Output control unit (dimming lighting unit)
14 Lighting circuit (dimming lighting)
15 Target illuminance setting part (target level setting part)

Claims (4)

Comprising a lighting device for supplying lighting power to the light source, the lighting device includes a an optical output the light source dimming lighting is to dimming lighting unit in accordance with the dimming signal, the target level of brightness of the illuminated surface a target level storage unit for storing, as the brightness level of the surface to be irradiated, which is detected by the brightness sensor matches the target level, outputs a dimming signal for controlling the dimming level to the dimming lighting unit a brightness control unit that, the target level setting section for setting the target level storage section to determine the target level on the basis of the detected brightness level and the dimming signal of the brightness sensor, the detection of the brightness sensor A lighting pattern storage unit that stores a correspondence relationship between the brightness level and the dimming signal as a lighting pattern ,
The target level setting unit is provided with a function of stopping the setting of the target level ,
The target level setting unit, based on the lighting pattern history stored in the lighting pattern storage unit, sets the target level if the same lighting pattern continues for a predetermined number of times after the lighting pattern is changed, and the same If the lighting pattern does not continue for a predetermined number of times, the setting of the target level is stopped . A lighting device that supplies lighting power to the light source, the lighting device having a dimming lighting unit for dimming and lighting the light source with a light output corresponding to the dimming signal, and a target level of brightness of the irradiated surface A dimming signal for controlling the dimming level is output to the dimming lighting unit so that the brightness level of the illuminated surface detected by the brightness sensor matches the target level. And a target level setting unit that determines a target level based on the brightness level detected by the brightness sensor and a dimming signal and sets the target level in the target level storage unit,
The target level setting unit is provided with a function of stopping the setting of the target level,
A first sensor signal corresponding to the brightness level of the irradiated surface detected by the brightness sensor is input to the target level setting unit, and the first sensor signal is input to the brightness control unit. The second sensor signal obtained by smoothing is input, and the target level setting unit changes the reflectance of the irradiated surface based on the first sensor signal when the optical output is changed at a high frequency. if it detected that the, luminaire you characterized by stopping the setting of the target level. When the target level setting unit sets the target level, there is provided means for notifying that the target level has been set by changing the dimming signal output from the brightness control unit in a predetermined pattern. The lighting fixture according to any one of claims 1 and 2. A power switch and a plurality of lighting fixtures according to any one of claims 1 to 3 to which power is supplied via the power switch, wherein one brightness is provided by the plurality of lighting fixtures. An illumination system characterized by sharing a sensor.

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