JP5821006B2 - Lighting device and lighting fixture using the same - Google Patents

Description

  The present invention relates to a lighting device and a lighting fixture using the lighting device.

  2. Description of the Related Art Conventionally, there has been known a lighting fixture that is integrally provided with an illuminance sensor and is attached to a ceiling of an office or the like. The luminaire described in Patent Document 1 includes a light source that illuminates an illuminated surface, a dimming control unit that adjusts the light output of the light source, an illuminance sensor that detects the illuminance of the illuminated surface with reflected light, and an illuminance sensor. And a central processing unit that supplies a dimming signal for keeping the detected illuminance constant to the dimming control unit.

  The central processing unit changes the light output of the light source every time the power is turned on, and applies to the irradiated surface based on the output value of the illuminance sensor without light output and the output value of the illuminance sensor with light output. A correspondence relationship between the light output ratio of the light source and the output value of the illuminance sensor in a state where there is no outside light is obtained. Then, the central processing unit sets a target value corresponding to a predetermined light output ratio based on the correspondence relationship, and then controls the light output of the light source so that the output value of the illuminance sensor becomes the target value.

JP 2005-243314 A

  By the way, in the lighting fixture like the above-mentioned conventional example, when the reflectance of light on the irradiated surface changes due to the layout change, the illuminance of the irradiated surface changes before and after that, so the target value of the illuminance sensor is reset. There is a need to. In the above conventional example, the target value is set every time the power is turned on. However, since the lighting space once becomes dark each time the power is turned on again, the brightness of the lighting space changes abruptly. There was a risk of discomfort.

  The present invention has been made in view of the above points, and a lighting device capable of setting a target value of an illuminance sensor for keeping the illuminance of an irradiated surface constant without causing discomfort to the user, and It aims at providing the lighting fixture using it.

In the lighting device of the present invention, the illuminance sensor that measures the illuminance of the irradiated surface irradiated with light from the light source by reflected light, and the illuminance of the irradiated surface is constant based on a target value of the output of the illuminance sensor. A control unit that controls the light output of the light source, and an operation input reception unit that receives a direct or remote operation input. The control unit sets a lighting period and a non-lighting period of the light source to a predetermined frequency. The light source is pulse-lit by switching alternately, and when the operation input is received by the operation input receiving unit, the output of the illuminance sensor during the lighting period of the light source and the output of the illuminance sensor during the non-lighting period of the light source run the setting process for setting the target value based on a difference between the illuminance sensor, the converting the output voltage of the output current by the integration circuit based on the illuminance of the illuminated surface The control unit, when executing a dimming process for controlling the light output of the light source by changing the on-duty ratio of the light source, the predetermined frequency, While switching to a normal frequency that can average the output voltage of the illuminance sensor, when executing the setting process, the predetermined frequency is a frequency lower than the normal frequency and the The output voltage of the illuminance sensor is switched to a set frequency that can follow the lighting period and non-lighting period of the light source .
Further, the lighting device of the present invention has an illuminance sensor that measures the illuminance of the irradiated surface irradiated with light from the light source by reflected light, and the illuminance of the irradiated surface is based on a target value of the output of the illuminance sensor. A control unit that controls the light output of the light source so as to be constant; and an operation input reception unit that receives a direct or remote operation input. The control unit determines a lighting period and a non-lighting period of the light source as predetermined. When the light source is pulse-lit by alternately switching at a frequency, and an operation input is received in the operation input receiving unit, the output of the illuminance sensor during the lighting period of the light source and the illuminance sensor during the non-lighting period of the light source A setting process for setting the target value based on a difference between the output and the illuminance sensor, wherein the illuminance sensor integrates an output current based on the illuminance of the irradiated surface with a resistor and a capacitor. The output voltage is converted into an output voltage by a path and input to the control unit, and the control unit executes a dimming process for controlling the light output of the light source by changing an on-duty ratio of the light source. The capacitance value of the capacitor of the integration circuit is switched to a capacitance value that is a time constant that can average the output voltage of the illuminance sensor, and when performing the setting process, The capacitance value of the capacitor of the integrating circuit is switched to a capacitance value that is a time constant that allows the output voltage of the illuminance sensor to follow the lighting period and non-lighting period of the light source.

In this lighting device, the operation input reception unit, the control unit and receives an operation input, and the setting process, it is preferable to perform the pre-Sulfur butterfly light treatment.

  The lighting device includes a switch for switching on / off the operation of the illuminance sensor, and the control unit measures the output voltage of the illuminance sensor during a non-lighting period of the light source when executing the setting process. When doing so, it is preferable to switch the switch off during the lighting period of the light source.

Luminaire of the present invention is characterized by comprising the any one of the lighting device, and a fixture main body for holding the lighting unit and the light source.

  The present invention has an effect that it is possible to set a target value of an illuminance sensor for keeping the illuminance of the irradiated surface constant without causing discomfort to the user.

It is a figure which shows Embodiment 1 of the lighting device which concerns on this invention, and a lighting fixture using the same, (a) is the schematic of a lighting fixture, (b) is the schematic of a lighting circuit part. It is a figure which shows a lighting fixture same as the above, (a) is a side view, (b) is the top view seen from the opening side of the instrument main body. (A) is a waveform diagram showing a pulse waveform of dimming control of the lighting device same as the above, (b) is a waveform diagram showing an output waveform of an illuminance sensor of the lighting device same as the above, (c) is one of (b). It is the wave form diagram which expanded the part. It is a flowchart for demonstrating the setting process of a lighting device same as the above. (A)-(c) is a wave form diagram for demonstrating the frequency switching operation | movement in a lighting device same as the above. (A)-(c) is a wave form diagram for demonstrating the measurement operation | movement in the ON period of the light source in a lighting device same as the above. (A)-(c) is a wave form diagram for demonstrating the measurement operation | movement in the OFF period of the light source in a lighting device same as the above. (A)-(c) is a wave form diagram for demonstrating the light control in a lighting device same as the above. It is a figure which shows Embodiment 2 of the lighting device which concerns on this invention, and is the schematic of a lighting circuit part. It is a flowchart for demonstrating the setting process of a lighting device same as the above.

(Embodiment 1)
Hereinafter, Embodiment 1 of a lighting device and a lighting fixture using the same according to the present invention will be described with reference to the drawings. In the following description, the vertical direction in FIG. 1A is defined as the vertical direction. As shown in FIG. 1A, the present embodiment is a lighting device A1 attached to a ceiling C1 of a general house or the like, and includes a lighting device including an illuminance sensor 1 and a lighting circuit unit 2, and an illuminance sensor 1 and lighting. An instrument body 3 that holds the circuit unit 2 is provided.

  The illuminance sensor 1 is made of, for example, a photodiode, and outputs a current based on the amount of reflected light reflected by the irradiated surface B1 irradiated with light from the luminaire A1. Not only the reflected light of the light from the luminaire A1 but also the reflected light reflected by the irradiated surface B1 from outside light such as natural light entering through the window is incident on the illuminance sensor 1.

  As shown in FIG. 1B, an integrating circuit including resistors R1 and R2 and a capacitor C1 is connected to the output terminal of the illuminance sensor 1. The integration circuit converts the output current flowing through the illuminance sensor 1 into a voltage, which is input to an analog input terminal of the main control unit 21 described later. Hereinafter, this voltage is referred to as “output voltage of the illuminance sensor 1”. Further, as shown in FIG. 1B, the switch SW1 is connected in series to the illuminance sensor 1, and the operation of the illuminance sensor 1 is performed by switching the on / off of the switch SW1 by a main control unit 21 described later. The period is controlled. In the present embodiment, the illuminance sensor 1 takes into account the time constants of the resistors R1 and R2 and the capacitor C1, and the rise time and fall time when the sensor output voltage varies from 0 to 3 V are 300 μs. The following performance is used.

  As shown in FIG. 1B, the lighting circuit unit 2 includes a dimming control unit 20 that performs dimming control of each LED unit 4 to be described later, and a dimming control unit 20 based on the output voltage of the illuminance sensor 1. And a main control unit 21 to be controlled. The dimming control unit 20 and the main control unit 21 are connected via a dimming signal line 24, a frequency synchronization signal line 25, and a frequency switching signal line 26. In the present embodiment, for convenience of explanation based on FIG. 1B, one LED unit 4 is described as being controlled by the dimming control unit 20, but actually, a plurality of LED units 4 are arranged. The dimming control unit 20 performs batch control. Of course, the dimming control unit 20 may control each LED unit 4 individually, but since it is not the gist of the present invention, the description is omitted here.

  The dimming control unit 20 includes a driver IC, and applies a driving signal to the switching element Q1 connected in series with the LED unit 4 to drive the LED unit 4 in a pulsed manner by driving it at a predetermined frequency. The dimming control unit 20 changes the on-duty ratio of the drive signal based on the dimming signal sent from the main control unit 20 via the dimming signal line 24 and changes the light output of the LED unit 4 to adjust the light output. Perform light control. Here, it is desirable that the predetermined frequency is set to such an extent that the blinking of the LED unit 4 cannot be recognized by human vision.

  The main control unit 21 includes a microcomputer, and includes a central processing unit (CPU) 22 that executes various programs, and a memory 23 that stores various programs and various data. The CPU 22 converts the output voltage of the illuminance sensor 1 input to the analog input terminal into a digital value. Further, when the infrared light receiving unit 6 receives an infrared signal transmitted from the remote controller D1 described later, the CPU 22 executes various processes according to commands included in the infrared signal. In particular, in the present embodiment, when an infrared signal associated with the pressing operation of the automatic light control button D10 is received, the CPU 22 uses this as a trigger to set a target value for the output voltage of the illuminance sensor 1, and to adjust the LED unit 4. Dimming processing for performing light control is sequentially executed.

  The dimming control unit 20 and the main control unit 21 are supplied with operating power from a 5V DC power source and a 12V DC power source, respectively. The LED unit 4 is supplied with a DC voltage necessary for lighting from a DC power source. These DC power supplies are composed of an AC voltage supplied from an external power supply (not shown) through the catch ceiling 30 or a power supply circuit that converts a DC voltage into a desired DC voltage and supplies the AC voltage. Since it is conventionally known, illustration and detailed description are omitted here. Of course, it goes without saying that the power supply voltage of these DC power supplies can be appropriately changed according to the design.

  As shown in FIGS. 2 (a) and 2 (b), the instrument body 3 includes a flat box whose bottom surface is open, and a cover formed of a translucent material that covers the side of the box and the opening of the box. Are combined. Eight LED units 4 each having a plurality of (9 in the drawing) light emitting diode elements 40 and a lighting circuit portion 2 are disposed inside the fixture body 3, and these LED units 4 serve as light source portions. It is composed. Note that a portion of the cover that covers the opening of the box is a diffusion cover 5 that diffuses light emitted from the LED unit 4 and irradiates the irradiated surface B1. The lighting circuit unit 2 is configured by mounting various electronic components on a substrate, and an infrared light receiving unit 6 that receives infrared rays transmitted from the remote controller D1 is provided on the substrate. The illuminance sensor 1 is attached to the lower surface of the instrument body 3 so that light emitted from the LED unit 4 does not directly enter. The instrument main body 3 can be detachably attached to a hooking ceiling 30 disposed prior to the ceiling C1.

  The remote control D1 remotely controls the lighting fixture A1, and as shown in FIG. 1A, a plurality of buttons for various operations such as an automatic light adjustment button D10 are provided. An infrared transmission unit D11 that transmits an infrared signal to the luminaire A1 is provided at the tip of the remote control D1. Therefore, by pressing any button on the remote controller D1, an infrared signal including a command corresponding to the button is transmitted to the lighting fixture A1. And in lighting fixture A1, the main control part 21 performs the process according to the command contained in the said infrared signal, when the infrared rays light-receiving part 6 of the lighting circuit part 2 receives an infrared signal.

  Hereinafter, the operation of this embodiment will be described. In the following description, the light output of the LED unit 4 when the on-duty ratio of the drive signal is 90% is the maximum light output, and the light output of the LED unit 4 when the on-duty ratio is 10% is the minimum light output. And The combined resistance value of the resistors R1 and R2 is 39 kΩ, and the capacitance value of the capacitor C1 is 3 nF. Further, the frequency of the drive signal during normal dimming control (hereinafter referred to as “normal frequency”) is 8 kHz. Further, the frequency of the drive signal during the setting process (hereinafter referred to as “set frequency”) is set to 125 Hz.

  Prior to describing the operation of the present embodiment, how to determine the normal frequency and the set frequency will be described. In the dimming process, since the switching element Q1 is driven at a normal frequency of a relatively high frequency, the output voltage of the illuminance sensor 1 is averaged without following the drive signal, and is approximately based on the illuminance of the irradiated surface B1. It becomes a constant value. In the present embodiment, the normal frequency is determined so as to suppress the error of the output voltage of the substantially constant illuminance sensor 1 to 10% or less.

  Here, the output voltage of the illuminance sensor 1 is obtained by converting the output current flowing through the illuminance sensor 1 into a voltage by the resistors R1 and R2 and the capacitor C1. Therefore, the rise and fall times of the output voltage of the illuminance sensor 1 are delayed by the combined resistance of the resistors R1 and R2 and the time constant of the capacitor C1 as compared to the drive signal (FIGS. 3A to 3C). reference). The ratio of the output voltage of the illuminance sensor 1 when the time t elapses from the rise of the light output of the LED unit 4 is expressed by the following equation, with the maximum value being 100%.

  In the above equation, “V (t)” represents the ratio of the output voltage of the illuminance sensor 1, “R” represents the combined resistance value of the resistors R1 and R2, and “C” represents the capacitance value of the capacitor C1. From the above equation, the time taken for the output voltage of the illuminance sensor 1 to change from 0% to 10% at the time of start-up can be obtained as 0.11 CR and the time taken from 0% to 90% as 2.3 CR. it can. Similarly, the time required for the output voltage of the illuminance sensor 1 to change from 100% to 90% at the time of falling is 0.11 CR, and the time required for the output voltage from 100% to 10% is 2.3 CR.

  As described above, since the output voltage error of the illuminance sensor 1 needs to be suppressed to 10% or less in the dimming process, the ratio of the output voltage of the illuminance sensor 1 must always be in the range of 90 to 100%. . In order to satisfy this condition, the normal frequency is fr, the off period ratio of the drive signal when the LED unit 4 is lit with the minimum light output is Dh, and the on period (1-Dh) / fr of the switching element Q1 is 0. It needs to be 11CR or less. That is, the normal frequency fr that satisfies the condition is expressed by the following equation.

  In the present embodiment, the normal frequency is determined to be 8 kHz based on the above equation, considering that the off period ratio Dh of the drive signal when the LED unit 4 is lit with the minimum light output is 90%.

  Next, in the setting process, the output voltage of the illuminance sensor 1 can follow the drive signal by switching the frequency of the drive signal to a set frequency lower than the normal frequency. Here, it is necessary to measure the output voltage of the illuminance sensor 1 in either the on period or the off period of the switching element Q1, and the sampling point is taken at the center of each period. In the present embodiment, the set frequency is determined so that the reading error of the output voltage of the illuminance sensor 1 is suppressed to 10% or less, that is, the ratio of the output voltage of the illuminance sensor 1 at the sampling point is within the range of 90 to 100%.

  In order to satisfy this condition, the set frequency is fm, the off period ratio of the drive signal when the LED unit 4 is lit at the maximum light output is Dlow, and 1/3 of the on period Dlow / fm of the switching element Q1 is 2. It needs to be 3CR or more. That is, the set frequency fm that satisfies the condition is expressed by the following equation.

  In the present embodiment, the setting frequency is determined to be 125 Hz based on the above equation, considering that the off period ratio Dlow of the drive signal when the LED unit 4 is lit at the maximum light output is 10%.

  Hereinafter, the operation of the present embodiment will be described with reference to FIG. When the automatic light control button D10 of the remote control D1 is pressed, an infrared signal is transmitted from the infrared transmission unit D11 (S1). When the infrared light receiving unit 6 of the lighting circuit unit 2 receives this infrared signal, the main control unit 21 starts the setting process using this as a trigger. The main control unit 21 first transmits a frequency switching signal to the dimming control unit 20 via the frequency switching signal line 26. As shown in FIG. 5B, the dimming control unit 20 receives the frequency synchronization signal transmitted from the main control unit 21 via the frequency synchronization signal line 25 at a constant period. Then, as shown in FIGS. 5A to 5C, the dimming control unit 20 switches the frequency of the drive signal from the normal frequency to the set frequency at the timing of receiving the frequency synchronization signal after receiving the frequency switching signal ( S2). Thereafter, the main control unit 21 starts measurement for setting the target value of the illuminance sensor 1 (S3).

  First, as shown in FIGS. 6A to 6C, the main control unit 21 measures the light output of the LED unit 4 and the external light by measuring the output voltage of the illuminance sensor 1 during the ON period of the switching element Q1. The illuminance of the irradiated surface B1 based on the above is measured (S4). At the time of the measurement, the main control unit 21 performs control so that the switch SW1 is always on regardless of the on period and the off period of the switching element Q1. The main control unit 21 performs the measurement 10 times (S5), and calculates an average value from the output voltage for 8 times by omitting the maximum value and the minimum value from the output voltage of the illuminance sensor 1 for 10 times (S6). Then, the main control unit 21 sets the obtained average value as the output voltage of the illuminance sensor 1 based on the light output of the LED unit 4 and external light (S7).

  Next, as shown in FIGS. 7A to 7C, the main control unit 21 measures the output voltage of the illuminance sensor 1 during the OFF period of the switching element Q1, thereby irradiating the surface B1 based on external light. Is measured (S8). Here, when performing the measurement, the main control unit 21 controls the switch SW1 to be on only during the off period of the switching element Q1. Therefore, since the illuminance sensor 1 operates only when the LED unit 4 is turned off, it can be made less susceptible to the light output when the LED unit 4 is turned on. The main control unit 21 performs the measurement 10 times (S9), and calculates an average value from the output voltage for 8 times by omitting the maximum value and the minimum value from the output voltage of the illuminance sensor 1 for 10 times (S10). . And the main control part 21 makes the obtained average value the output voltage of the illumination intensity sensor 1 based on external light (S11).

  Next, the main control unit 21 calculates the output voltage of the illuminance sensor 1 at the time of maximum light output of the LED unit 4 without external light, from the difference in output voltage of the illuminance sensor 1 obtained in each of the above measurements. . For example, when the output voltage of the illuminance sensor 1 based on the light output of the LED unit 4 and the external light component is 2.3 V, and the output voltage of the illuminance sensor 1 based on only the external light component is 0.8 V, the maximum light output time The output voltage of the illuminance sensor 1 at (2.3−0.8) × 0.9 = 1.35V. In the above formula, “0.9” is multiplied because, in the present embodiment, the light output of the LED unit 4 when the on-duty ratio of the drive signal is 90% is determined as the maximum light output.

  Then, the main control unit 21 sets the output voltage of the illuminance sensor 1 at the time of maximum light output of the LED unit 4 excluding the external light obtained as described above as a target value (S13), and via the frequency switching signal line 26. A frequency switching signal is transmitted to the dimming control unit 20. The dimming control unit 20 switches the frequency of the drive signal from the set frequency to the normal frequency (S14). Thereafter, the main control unit 21 starts a light control process for performing automatic light control based on the target value of the illuminance sensor 1 (S15).

  In the dimming process, since the switching element Q1 is driven at a normal frequency, the output voltage of the illuminance sensor 1 is averaged without following the drive signal, and becomes a substantially constant value based on the illuminance of the irradiated surface B1. . The main control unit 21 adjusts the light output of the LED unit 4 so that the output voltage of the illuminance sensor 1 coincides with a value obtained by multiplying the target value obtained by the setting process by a desired dimming ratio. A dimming signal is transmitted to the dimming control unit 20 via the optical signal line 24. Then, as shown in FIGS. 8A to 8C, the dimming control unit 20 changes the on-duty ratio of the drive signal based on the received dimming signal, thereby changing the light output of the LED unit 4. adjust. In this way, the light output of the LED unit 4 is adjusted so that the output voltage of the illuminance sensor 1 matches the value obtained by multiplying the target value by the desired dimming ratio, so the illuminance of the irradiated surface B1 is constant. Kept.

  As described above, in the present embodiment, when the automatic light adjustment button D10 is pressed, a setting process for setting a target value of the output voltage of the illuminance sensor 1 is executed. In the setting process, the output voltage of the illuminance sensor 1 is alternately measured during the ON period and the OFF period of the switching element Q1, and the difference is obtained to obtain the difference between the maximum light output of the LED unit 4 with no external light. The output voltage of the illuminance sensor 1 is set as a target value. That is, in this embodiment, since the output voltage of the illuminance sensor 1 is alternately measured during the lighting period and the non-lighting period of the LED unit 4, the measurement can be performed without turning off the apparatus. The brightness of the lighting space does not change abruptly. Therefore, it is possible to set a target value of the illuminance sensor 1 for keeping the illuminance of the irradiated surface B1 constant without causing discomfort to the user.

  In the present embodiment, when the setting process is executed, the frequency of the drive signal is switched to a setting frequency that is lower than the normal frequency when the dimming process is performed. For this reason, since the output voltage of the illuminance sensor 1 can be made to follow the drive signal during the setting process, the output voltage of the illuminance sensor 1 can be measured with high accuracy. Further, since the set frequency is lower than the normal frequency, it is possible to improve the anti-noise characteristic during the setting process, and it is possible to further improve the measurement accuracy.

(Embodiment 2)
Hereinafter, Embodiment 2 of the lighting device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. The present embodiment is characterized in that, when executing the setting process, instead of switching the frequency of the driving signal of the switching element Q1, the time constant of the integrating circuit is switched by switching the capacitance of the capacitor of the integrating circuit. In the present embodiment, as shown in FIG. 9, a series circuit of a capacitor C2 and a switch SW2 is connected in parallel with the capacitor C1. The switch SW2 can be switched on / off by the main controller 21, and is switched off only during the setting process.

  The operation of the present embodiment is basically the same as the operation of the first embodiment as shown in FIG. Therefore, in the following, a point different from the first embodiment in the present embodiment, that is, a point of switching the time constant of the integration circuit by switching the capacitance of the capacitor of the integration circuit when the setting process and the dimming process are performed will be described. In the following description, the light output of the LED unit 4 when the on-duty ratio of the drive signal is 90% is the maximum light output, and the light output of the LED unit 4 when the on-duty ratio is 10% is the minimum light output. And The combined resistance value of the resistors R1 and R2 is 39 kΩ, the capacitance value of the capacitor C1 is 3 nF, and the combined capacitance value of the capacitors C1 and C2 is 0.19 uF. Furthermore, the normal frequency is set to 125 Hz.

  First, in the setting process, it is necessary to allow the output voltage of the illuminance sensor 1 to follow the drive signal. Here, it is necessary to measure the output voltage of the illuminance sensor 1 in either the on period or the off period of the switching element Q1, and the sampling point is taken at the center of each period. In the present embodiment, it is necessary to suppress the reading error of the output voltage of the illuminance sensor 1 to 10% or less, that is, the ratio of the output voltage of the illuminance sensor 1 at the sampling point is within the range of 90 to 100%.

  In order to satisfy this condition, the normal frequency is fr, the off period ratio of the drive signal when the LED unit 4 is lit at the maximum light output is Dlow, and 1/3 of the on period Dlow / fm of the switching element Q1 is 2. It needs to be 3CR or more. That is, the capacitance value Cm of the capacitor of the integration circuit that satisfies the condition is expressed by the following equation.

  In the present embodiment, considering that the off period ratio Dlow of the drive signal when the LED unit 4 is lit at the maximum light output is 10%, the capacitance value of the capacitor Cm of the integration circuit is set to 3 nF based on the above equation. It stipulates.

  Next, in the dimming process, it is necessary to average the output voltage of the illuminance sensor 1 without following the drive signal so as to have a substantially constant value based on the illuminance of the irradiated surface B1. In this embodiment, it is necessary to suppress the error of the output voltage of the substantially constant illuminance sensor 1 to 10% or less.

  In order to satisfy this condition, the normal frequency is fr, the off period ratio of the drive signal when the LED unit 4 is lit with the minimum light output is Dh, and the on period (1-Dh) / fr of the switching element Q1 is 0. It needs to be 11CR or less. That is, the capacitance value Cr of the capacitor of the integration circuit that satisfies the condition is expressed by the following equation.

  In the present embodiment, considering that the drive signal off-period ratio Dh is 90% when the LED unit 4 is lit with the minimum light output, the capacitance value of the capacitor Cr of the integrating circuit is set to 0 based on the above equation. 19 μF.

  Therefore, in this embodiment, as shown in FIG. 10, when executing the setting process, the main control unit 21 switches off the switch SW2 to disconnect the capacitor C2 from the integrating circuit. Thereby, the capacitance value of the capacitor of the integrating circuit becomes 3 nF which is the capacitance value of the capacitor C1 (S16). Further, when executing the dimming process, the main control unit 21 switches on the switch SW2 to connect the capacitor C2 to the integrating circuit. As a result, the capacitance value of the capacitor of the integrating circuit becomes 0.19 μF, which is the combined capacitance value of the capacitors C1 and C2 (S17).

  As described above, this embodiment can achieve the same effects as those of the first embodiment. In the present embodiment, when the setting process is executed, the capacitance value of the capacitor of the integration circuit is switched so that the output voltage of the illuminance sensor 1 can follow the drive signal. Output voltage can be measured. Furthermore, in this embodiment, since the capacitance of the capacitor of the integration circuit is switched, the cost can be reduced as compared with the configuration of the first embodiment that switches the frequency of the drive signal.

  In each of the above embodiments, an LED unit including one or more light emitting diodes is used as the light source unit. However, other light sources may be used as long as they can follow pulse lighting by the lighting circuit unit 2. . Moreover, in each said embodiment, although the infrared rays light-receiving part 6 is used as the operation input reception part, you may provide operation parts, such as a pushbutton, in the instrument main body 3 as an operation input reception part, for example. In this case, when the user directly operates the operation unit, a trigger that causes the main control unit 21 to execute the setting process and the dimming process can be given.

1 Illuminance sensor 20 Light control unit (control unit)
21 Main control unit (control unit)
3 Instrument body 4 LED unit (light source)
6 Infrared light receiving unit (operation input receiving unit)
A1 Lighting equipment B1 Irradiated surface

Claims (5)

An illuminance sensor that measures the illuminance of the illuminated surface irradiated with light from the light source by reflected light, and the light of the light source so that the illuminance of the illuminated surface is constant based on a target value of the output of the illuminance sensor A control unit that controls output, and an operation input receiving unit that receives a direct or remote operation input, wherein the control unit alternately switches between a lighting period and a non-lighting period of the light source at a predetermined frequency. When the light source is pulse-lit and an operation input is received in the operation input receiving unit, the output of the illuminance sensor during the lighting period of the light source and the difference between the output of the illuminance sensor during the non-lighting period of the light source Execute the setting process to set the target value ,
The illuminance sensor converts an output current based on the illuminance of the irradiated surface into an output voltage by an integration circuit and inputs the output voltage to the control unit, and the control unit changes an on-duty ratio of the light source. Thus, when performing the dimming process for controlling the light output of the light source, the predetermined frequency is switched to a normal frequency that can average the output voltage of the illuminance sensor, and the setting When executing the process, the predetermined frequency is lower than the normal frequency, and the output voltage of the illuminance sensor can follow the lighting period and the non-lighting period of the light source. The lighting device characterized by switching to the set frequency . An illuminance sensor that measures the illuminance of the illuminated surface irradiated with light from the light source by reflected light, and the light of the light source so that the illuminance of the illuminated surface is constant based on a target value of the output of the illuminance sensor A control unit that controls output, and an operation input receiving unit that receives a direct or remote operation input, wherein the control unit alternately switches between a lighting period and a non-lighting period of the light source at a predetermined frequency. When the light source is pulse-lit and an operation input is received in the operation input receiving unit, the output of the illuminance sensor during the lighting period of the light source and the difference between the output of the illuminance sensor during the non-lighting period of the light source Execute the setting process to set the target value,
The illuminance sensor converts an output current based on the illuminance of the irradiated surface into an output voltage by an integrating circuit including a resistor and a capacitor, and inputs the output voltage to the control unit. The control unit turns on the light source. When performing dimming processing for controlling the light output of the light source by changing the duty ratio, the capacitance value of the capacitor of the integrating circuit can be averaged with the output voltage of the illuminance sensor. When the setting process is executed, the capacitance value of the capacitor of the integration circuit is changed to the output voltage of the illuminance sensor between the lighting period and the non-lighting period of the light source. lit device you and switches the capacitance value to be a time constant to the extent that can be made to follow. The lighting device according to claim 1, wherein the operation input receiving unit causes the control unit to execute the setting process and the dimming process when receiving an operation input . A switch for switching on / off the operation of the illuminance sensor, and the control unit performs the setting process when measuring the output voltage of the illuminance sensor during a non-lighting period of the light source. The lighting device according to any one of claims 1 to 3, wherein the switch is turned off during the lighting period . A lighting fixture comprising: the lighting device according to any one of claims 1 to 4; and a fixture main body that holds the lighting device and the light source .

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