JP2009004190A - LIGHTING DEVICE AND LIGHTING DEVICE CONTROL METHOD - Google Patents

Abstract

Provided are a lighting device and a lighting device control method that can be turned on darkly when a person is not detected to suppress energy consumption and at the same time recognize dangers such as obstacles and steps. .
[Solution]
When a person is detected in an illuminating device that includes LEDs 2, 2,..., A light receiving unit 4 that detects a person, and a control unit 41 that controls driving of the LEDs 2, 2,. Since the lighting device is configured so that the LEDs 2, 2... Are lit brightly and otherwise darkly lit, energy consumption can be suppressed and, for example, when there are obstacles, steps, etc., early Can recognize and avoid danger.
[Selection] Figure 4

Description

  The present invention relates to a lighting device using a light emitting diode (hereinafter referred to as an LED), an electro luminescence (EL), a fluorescent lamp, or the like as a light source. In particular, the present invention relates to a lighting device that includes a human detection sensor and controls a light source in accordance with detection by the human detection sensor, and a method for controlling the lighting device.

  Conventionally, incandescent bulbs or fluorescent lamps are mainly used as light sources for indoor or outdoor illumination. In recent years, instead of these light sources, illumination devices using LEDs as light sources have been used. Lighting devices using LEDs are characterized by low power consumption, long life, excellent impact resistance, small size and light weight compared to incandescent bulbs or fluorescent lamps. there's a possibility that.

  On the other hand, from the viewpoint of energy saving, it is desirable to turn on the lighting device only when necessary. Conventionally, incandescent bulbs or fluorescent lamps that are configured to be turned on / off according to the presence / absence of a person have been widely adopted. Similar proposals have been made for lighting devices using LEDs (see, for example, Patent Document 1).

The lighting device disclosed in Patent Document 1 is configured to supply a voltage to an LED for a time set by a timer and turn on the LED when a person is detected by a human detection sensor.
JP 2001-351402 A

  However, in the illumination device of Patent Document 1, when a person is not detected, the LED is turned off, so that it is dark, and when there are obstacles, steps, etc., it is difficult to recognize the problem, which is not preferable for safety. was there.

  The present invention has been made in view of such circumstances, and the LED is lit brightly / darkly according to the presence / absence of the person detected by the human detection sensor, regardless of the presence / absence of the person. To provide a lighting device and a method for controlling the lighting device that can suppress energy consumption as compared with a lighting device that continues to be lit, and that allow a person to recognize dangers such as obstacles and steps. Objective.

  The illumination device according to the present invention includes a light source composed of an LED or the like, a human detection sensor that detects a person, and a control unit that controls the brightness of the light source, and the control unit does not detect a person by the human detection sensor. Is characterized in that the brightness of the light source is controlled to be darker than usual.

  In the present invention, when the person is not detected, the LED is lit darkly, so that energy consumption can be suppressed and, for example, when there is an obstacle, a step or the like, the person is surely recognized. Can avoid danger.

  The illumination device according to the present invention includes a light source composed of an LED or the like, a human detection sensor that detects a person, and controls the light source to normal brightness when a person is detected by the human detection sensor, and the human detection sensor Control means for controlling the light source to a brightness that can recognize obstacles, steps, etc. that are darker than normal brightness.

  In this invention, when the human detection sensor detects a person, the light source is turned on brightly. When the person detection sensor is not detected, the light source is turned on darkly. When there is no person within the detection range of the human detection sensor. Since the light source is turned on, for example, when there is an obstacle, a step, etc., it is possible to promptly or surely recognize a person to prompt an avoidance action, thereby avoiding danger. Moreover, energy consumption can be suppressed as compared with the case where the lamp is always lit brightly.

  An illumination device according to the present invention includes a light source composed of an LED or the like, a human detection sensor that detects a person, and a control unit that controls driving of the light source according to a detection result by the human detection sensor. The light source is configured to light up brightly / darkly according to the presence / absence of a person detected by the detection sensor.

  In this invention, when the human detection sensor detects a person, the light source is turned on brightly. When the person detection sensor is not detected, the light source is turned on darkly. When there is no person within the detection range of the human detection sensor. Since the light source is turned on, for example, when there is an obstacle, a step, etc., it is possible to promptly or surely recognize a person to prompt an avoidance action, thereby avoiding danger. Moreover, energy consumption can be suppressed as compared with the case where the lamp is always lit brightly.

  The lighting device according to the present invention includes a switching element that performs an opening / closing operation to control driving of the light source, and the control unit includes a pulse generation circuit that generates a pulse signal, which is detected by a human detection sensor. A pulse signal having a duty ratio corresponding to the presence / absence of a person is generated in a pulse generation circuit, and the switching element is operated by the generated pulse signal.

  In the present invention, a pulse signal having a duty ratio corresponding to the presence / absence of a person detected by the human detection sensor is generated, and the switching element is operated by the pulse signal. The current supplied to the light source is turned ON / OFF according to the OFF operation. Since the brightness of the light source is determined according to the average current value, the brightness of the light source can be changed to light / dark by increasing / decreasing the duty ratio of the pulse signal according to the presence / absence of a person. . When the light source is an LED, the magnitude of the current supplied to the LED is constant, so that the brightness of the LED can be changed without changing the chromaticity.

  In the illumination device according to the present invention, the human detection sensor includes a light receiving element that receives infrared rays of a person.

  In the present invention, the infrared ray emitted from the human body is detected by the light receiving element using the light receiving element that receives the infrared ray, and a person can be detected with a simple configuration including only the light receiving element.

  Moreover, the illuminating device which concerns on this invention is equipped with infrared LED which emits infrared rays, It is characterized by the above-mentioned.

  In this invention, the infrared ray emitted from the infrared LED and reflected by the human body is detected by the light receiving element, and when the person comes near the lighting device, the infrared ray reflected by the human body is By appropriately setting the infrared LED so that it is stronger than the infrared rays naturally emitted from the human body, it is possible to reduce the sensitivity of the human detection sensor and prevent malfunction.

  The illumination device according to the present invention includes an illuminance sensor that measures the illuminance around the illumination device, and when the ambient illuminance measured by the illuminance sensor is greater than a predetermined value, the light source is made darker than usual. It is characterized by controlling.

  In the present invention, even when it is determined that it is necessary to detect the infrared rays (people) by the human detection sensor and to light up brightly, it is possible for a person to recognize an obstacle or the like without lighting up brightly. However, when it is possible to avoid dangers sufficiently by dark lighting, it is possible to avoid unnecessarily brightly lighting the lighting device, so it is possible to assist in recognition of obstacles etc. of people passing through the lighting device side. It is possible to ensure safety and drive the lighting device more effectively and with energy saving.

  A method for controlling an illuminating device according to the present invention is a method for controlling an illuminating device including a light source composed of an LED or the like, a human detection sensor that detects a person, and a control unit that controls the brightness of the light source. Is characterized in that the brightness of the light source is controlled to be darker than usual when no person is detected by the human detection sensor.

  In the present invention, when the person is not detected, the LED is lit darkly, so that energy consumption can be suppressed and, for example, when there is an obstacle, a step or the like, the person is surely recognized. Can avoid danger.

  According to the present invention, when the human detection sensor detects a person, the LED is lit brightly, and when the person detection sensor is not detected, the LED is lit darkly. When there is an object, a step, etc., it is possible to make sure that a person can recognize it and avoid danger.

Embodiments of a lighting device according to the present invention will be described below in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is an external view of a lighting apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  Referring to FIG. 2, the support 1 is an elongated bowl shape formed by bending, and is formed in a direction orthogonal to a rectangular plane 1 a that forms a rectangle and both ends of the rectangular plane 1 a in the short direction. Two rectangular side surfaces 1b and 1b extending downward are provided. The support 1 is made of aluminum having excellent thermal conductivity.

  On the rectangular flat surface 1a of the support 1, two LED substrates 3, 3 on which a plurality of LEDs 2, 2,... Are mounted are non-mounted side surfaces (surfaces opposite to the surfaces on which the LEDs 2, 2,... Are mounted). The contact is made through the heat conductive sheet 30 and fixed by, for example, a screw or the like. The heat conductive sheet 30 is made of a heat conductive resin (for example, polyphenylene sulfide resin), and the heat generated in the LEDs 2, 2... Is supported from the non-mounting side surface of the LED substrate 3 through the heat conductive sheet 30. Transmitted to the body 1.

  FIG. 3 is a schematic view of the LED substrate 3 used in the illumination device of FIG. 1 or FIG. As shown in the drawing, a plurality of LEDs 2, 2... Connected in series are arranged in parallel on the LED substrate 3 made of epoxy resin containing glass fibers. The LEDs 2, 2... Indicated by rectangles in the figure are LED devices, a surface-mount type LED comprising a sealing resin for sealing the LED elements and input and output electrodes so as to be shielded from the outside air. It is. In the case of a white LED, the encapsulating resin contains a phosphor.

  As shown in FIG. 1, a light receiving portion (human detection sensor) 4 for receiving infrared rays is attached to one end of the rectangular flat surface 1a of the support 1 in the longitudinal direction. The light receiving unit 4 is an infrared sensor that receives infrared rays and outputs a signal, and a known infrared sensor such as a thermopile using a thermoelectromotive force effect or a pyroelectric body using a pyroelectric effect can be used.

  The place where the light receiving unit 4 is arranged is not limited to one end in the longitudinal direction of the support 1, and is provided at a place suitable for human detection in consideration of the place where the lighting device is installed, the shape of the lighting device, and the like. It only has to be done. In addition to the infrared sensor, any sensor that can detect the presence / absence of a person can be applied instead of the infrared sensor.

  As shown in FIG. 2, the support 1 has a curved surface curved in a tunnel shape so as to cover the LED substrates 3, 3 on which the LEDs 2, 2,... Are mounted, and is excellent in impact resistance and heat resistance. A globe 5 made of polycarbonate resin is attached. On the inner surface of the globe 5, there is provided a microlens sheet 6 on which a large number of fine lenses are formed so as to diffuse light so that the light irradiated through the globe 5 is uniform.

  On the other hand, a power supply circuit board 70 on which the power supply circuit component 7 is mounted is attached to the opening-side housing portion of the support 1 having a bowl shape, and a rectangular resin resin is formed at the open end of the support 1. A cover plate 8 is attached.

  Bases 91 and 92 are fixed to both ends in the longitudinal direction of the support 1 to which the globe 5 and the cover plate 8 are attached. The base 91 is provided with a pair of mounting pins 91a and 91b which can be mounted on a socket for a straight tube fluorescent lamp. Similarly, the base 92 is provided with mounting pins 92a and 92b that can be mounted on a socket for a straight tube fluorescent lamp. These mounting pins 91a, 91b, 92a, 92b are connected to the power supply circuit component 7 via respective lead wires (not shown).

  FIG. 4 is an electric circuit diagram of the lighting device. A full-wave rectification unit 71 is connected between the mounting pins 91 a and 91 b of the base 91, and a full-wave rectification unit 72 is connected between the mounting pins 92 a and 92 b of the base 92.

  Connected to the anode side of the full-wave rectifying units 71 and 72 is one end of an LED light emitting unit 20 formed by connecting a plurality of series circuits in which a current limiting resistor 20a and a plurality of LEDs 2, 2. It is. On the other hand, the cathode sides of the full-wave rectifying units 71 and 72 are connected to a grounding line.

  Further, one end of a smoothing capacitor 73 is connected to the anode side of the full-wave rectifying units 71 and 72, and the other end of the smoothing capacitor 73 is connected to a grounding line.

  Furthermore, one end of a series circuit in which two resistors 74 and 75 are connected in series is connected to the anode side of the full-wave rectifying units 71 and 72, and the other end of the series circuit is connected to a grounding line. is there. A power supply unit 40 is connected to the resistor 75 in parallel. Thereby, a constant voltage is applied to the power supply unit 40.

  On the other hand, the other end of the LED light emitting unit 20 is connected to the collector electrode of the transistor 76, and the emitter electrode of the transistor 76 is connected to one end of the resistor 77. The other end of the resistor 77 is connected to the grounding line. In this configuration, when a current is supplied to the base electrode of the transistor 76, a collector current flows through the transistor 76 and a current flows through the LED light emitting unit 20.

  The light receiving unit 4 and the control unit 41 are connected to the power supply unit 40 via different lead wires, and current is supplied to the light receiving unit 4 and the control unit 41 from the power supply unit 40 which is a constant voltage power source. The As described above, the light receiving unit 4 is an infrared sensor including a light receiving element that detects infrared rays, and outputs an “L” (low) / “H” (high) signal according to the presence / absence of a certain amount or more of infrared rays. This output signal is given to the control unit 41.

  The control unit 41 is a control circuit including a pulse generation circuit 41a that generates a pulse signal. For example, when the “H” signal is given by the light receiving unit 4, the control unit 41 generates a pulse signal with a small duty ratio (for example, 25%) in the pulse generation circuit 41 a and converts the generated pulse signal into a transistor 76 base electrodes are provided. At this time, the transistor 76 opens and closes according to the presence or absence of current supplied to the base electrode of the transistor 76.

  On the other hand, the control unit 41 is configured to provide a signal with a large duty ratio (for example, 100%), that is, an energization signal to the base electrode of the transistor 76 when the “L” signal is given by the light receiving unit 4. . At this time, the transistor 76 is closed. Further, the control unit 41 includes a delay circuit so that an energization signal is given to the base electrode of the transistor 76 for a predetermined time after the signal given by the light receiving unit 4 is switched from “L” to “H”. It is configured.

  Here, the duty ratio (25% / 100%) of the pulse signal is set in advance. However, the present invention is not limited to this, and a means for setting the duty ratio is provided and changed according to the use and installation location of the lighting device. You may comprise so that it can do. Further, the small duty ratio applied when a person is detected is not limited to 25%, but may be a duty ratio that allows a person to recognize an obstacle or the like. By making the duty ratio smaller than 25%, it is possible to further save energy.

  The brightness with which a person can recognize an obstacle or the like is considered to be about several tens of lux. Therefore, it is preferable that the duty ratio when the lighting device is lit dark is set to be about several tens of lux on the irradiation surface. Note that the normal brightness (illuminance) immediately below (1 m) of the 20 W fluorescent lamp is about 200 lux.

  The lighting device configured as described above is mounted to the socket for the straight tube fluorescent lamp with the mounting pins 91a, 91b, 92a, 92b so that the globe 5 side is in the irradiation direction, and the mounting pins 91a, 92a are commercially available. Connected to power. In this state, when the power is turned on, an alternating current is supplied to the full-wave rectifiers 71 and 72 via the mounting pins 91 a and 92 a, rectified by the full-wave rectifiers 71 and 72, and then smoothed by the smoothing capacitor 73. The smoothed direct current is supplied to the LED light emitting unit 20 and the power supply unit 40, respectively.

  The power supply unit 40 supplies current to the light receiving unit 4 and the control unit 41. The light receiving unit 4 gives an output signal corresponding to the detection of infrared rays to the control unit 41, and the control unit 41 sends a pulse signal having a predetermined duty ratio corresponding to the output signal given by the light receiving unit 4 to the pulse generation circuit 41a. And the generated pulse signal is output to the transistor 76. The transistor 76 performs an opening / closing operation in accordance with the pulse signal. As a result, the LED light emitting unit 20 is supplied with a pulsed current corresponding to the opening / closing operation of the transistor 76, and the LEDs 2, 2,. The current is supplied and lighted only during the state. The brightness of the LEDs 2, 2... Is determined by the average value of the supplied current. Note that the ON / OFF switching frequency of the transistor 76 is determined to be a high frequency at which the turning-off of the LEDs 2, 2,.

  As described above, when a certain amount or more of infrared rays is detected, that is, when a person is detected, the lighting device is lit brightly for the time set by the delay circuit, and is darkly lit otherwise. Since it is comprised so that energy consumption can be suppressed, for example, when there are an obstacle, a level | step difference, etc., it can recognize early and a danger can be avoided.

  Further, the transistor 76 is opened / closed by a pulse signal having a duty ratio changed to large / small according to the presence / absence of infrared detection of a certain amount or more, that is, the presence / absence of human detection. Since the duty ratio of the pulse signal is changed instead of changing the magnitude of the current flowing through the LED, the brightness of the LEDs 2, 2,... Can be changed to light / dark without changing the chromaticity.

  In addition, a light receiving element that receives infrared light is used as the light receiving unit 4 to detect infrared light emitted from the human body, and a person can be detected with a simple configuration including only the light receiving element.

  In the above embodiment, the light receiving unit 4 is configured to output an “L” / “H” signal in accordance with the presence / absence of infrared detection of a certain amount or more, and the light receiving unit 4 outputs the signal. Although the control unit 41 is configured to cause the pulse generation circuit 41a to generate a pulse signal having a duty ratio of 100% / 25% in response to the “L” / “H” signal, the present invention is not limited to this. The light receiving unit is configured to output a signal corresponding to the amount of infrared rays, and includes a PWM generation circuit that generates a pulse width modulation signal (hereinafter referred to as a PWM signal) as a pulse generation circuit 41a, and an infrared ray detected by the light receiving unit. The control unit may be configured to cause the pulse generation circuit to generate a PWM signal having a duty ratio corresponding to the amount of. In this case, the brightness of the LEDs 2, 2,... Can be changed in multiple stages according to the amount of infrared rays detected by the light receiving unit 4, and finer brightness control is possible.

  Further, the control unit 41 is not limited to the configuration described above, and includes a CPU, a ROM, and a RAM, and is configured to perform drive control of the LEDs 2, 2,... By the operation of the CPU according to the control program stored in the ROM. May be. In this case, for example, the control unit 41 determines the presence / absence of infrared detection, that is, the presence / absence of a person according to the output signal given by the light receiving unit 4, and determines the presence / absence of the determined person. In response, a PWM signal having a duty ratio of large / small is generated, and the generated PWM signal is output to the transistor 76. As a result, the lighting device is turned on brightly / darkly according to the presence / absence of a person.

(Embodiment 2)
FIG. 5 is an electric circuit diagram of the lighting apparatus according to Embodiment 2 of the present invention.

  As shown in the drawing, infrared LEDs 42, 42... Are connected to each series circuit of the LED light emitting unit 20. The infrared LEDs 42, 42,... Are mounted on the LED boards 3, 3 on which the LEDs 2, 2,. Since the other configuration is the same as that of the first embodiment shown in FIG. 4, the same reference numerals as those in FIG. 4 are given to the corresponding structural members, and detailed description of the configuration and operation is omitted. As the light receiving element of the infrared sensor, for example, in addition to the above-described thermal type sensors such as thermopile and pyroelectric material, a phototransistor or a photodiode using the photovoltaic effect, a CdS cell using the photoconductive effect, etc. A known light receiving element can be used.

  The illuminating device thus configured is mounted on the socket for a straight tube fluorescent lamp with mounting pins 91a, 91b, 92a, 92b so that the globe 5 side is in the irradiation direction, and the mounting pins 91a, 92a are commercial power supplies. Connected to. In this state, when the power is turned on, an alternating current is supplied to the full-wave rectifiers 71 and 72 via the mounting pins 91 a and 92 a, rectified by the full-wave rectifiers 71 and 72, and then smoothed by the smoothing capacitor 73. The smoothed direct current is supplied to the LED light emitting unit 20, the infrared LEDs 42, 42... And the power source unit 40, respectively.

  The power supply unit 40 supplies current to the light receiving unit 4 and the control unit 41. The light receiving unit 4 gives an output signal corresponding to the detection of infrared rays to the control unit 41, and the control unit 41 opens and closes the transistor 76 at a predetermined duty ratio according to the output signal given by the light receiving unit 4. . As a result, a pulsed current corresponding to the opening / closing operation of the transistor 76 is supplied to the LED light emitting unit 20 and the infrared LEDs 42, 42..., And the LED 76, the infrared LEDs 42, 42. A current is supplied only during the period and the lamp is lit.

  As in the first embodiment, the illumination device according to the present embodiment closes the transistor 76 with a large duty ratio (for example, 100%) and detects the LEDs 2, 2,. Are brightly lit for a preset time, and otherwise, the transistor 76 is opened and closed with a small duty ratio (for example, 25%) so that the LEDs 2, 2,.

  The illumination device according to the present embodiment detects infrared rays emitted from the infrared LEDs 42, 42... And reflected by the human body by the light receiving unit 4, and when the person comes near the illumination device, By appropriately setting the infrared LEDs 42, 42... So that the reflected infrared rays are stronger than the infrared rays naturally emitted from the human body, it is possible to reduce the sensitivity of the light receiving unit 4 and prevent malfunctions.

  In the present embodiment, the infrared LEDs 42, 42... Are connected to one end of each series circuit of the LED light emitting unit 20, but are not limited to this, and may be connected in the middle of the series circuit. , May be connected in parallel to the series circuit. By incorporating the infrared LEDs 42 in the two LED rows of the LED light emitting unit 20, it is not necessary to separately provide a drive circuit for the infrared LEDs 42, which is simple.

  Further, in the above-described two embodiments, when the human detection sensor cannot detect a person, the LED 2 is driven at a low duty ratio by PWM control to lower the luminance, and the lighting device is lit darkly. The method of controlling the dark lighting of the lighting device is not limited to this. As another control method, for example, the lighting device may be lit in a dark manner by a method (column control) in which only a part of a plurality of LEDs 2 is turned on. It may be a control (thinning-out control) in which some LEDs are selected and lighted corresponding to the above.

  As mentioned above, although the main structure and control were each demonstrated about the illuminating device of two embodiment, with reference to FIG. 6, the control flow of lighting control of an illuminating device is demonstrated still in detail. The difference between the first embodiment and the second embodiment is a difference in whether or not an infrared LED is provided in the light emitting unit, and the control flow described below can be applied to any embodiment.

  First, after the power is turned on, the control unit 41 opens and closes the transistor 76 with a small duty ratio (for example, 25%), and causes the LEDs 2, 2,... To illuminate darkly (step S1).

  Next, an output signal output by the light receiving unit 4 which is a human detection sensor whose power is turned on in conjunction with the lighting device is captured (step S2). Furthermore, the presence / absence of infrared (human) detection is determined using the output signal captured in step S2 (step S3).

  If it is determined in step S3 that infrared rays (people) are detected (step S3: YES), the transistor 76 is opened / closed with a large duty ratio (for example, 100%), and the LEDs 2, 2,. At the same time (step S4), a timer separately installed in the lighting device is reset to 0 and started, and the time after detecting a person is measured (step S5).

  On the other hand, when it is determined in step S3 that infrared rays (people) are not detected (step S3: NO), the process returns to step S2 and repeats a series of operations in a state where the LEDs 2, 2,. .

  After starting the timer in step S5, the output signal output by the light receiving unit 4 is captured (step S6), and the presence or absence of infrared (human) detection is determined using the output signal captured in step S6. (Step S7).

  If it is determined in step S7 that infrared rays (people) have been detected (step S7: YES), the process returns to step S5 and the series of operations is repeated with the LEDs 2, 2,.

  On the other hand, if it is determined in step S7 that no infrared ray (person) has been detected (step S7: NO), it is determined whether or not the time set by the timer has elapsed (whether or not time is up) (step S7). S8).

  If it is determined in step S8 that the time is not up (step S8: NO), the process returns to step S6 and repeats a series of operations in a state where the LEDs 2, 2.

  If it is determined in step S8 that the time is up (step S8: YES), the process returns to step S1 and a series of operations are repeated until the power is shut off.

  As described above, the illuminating device is configured to light up the LEDs 2, 2... For the time set by the timer when infrared rays (people) are detected, and to darkly illuminate otherwise. Therefore, bright lighting can be continued for at least a predetermined time after the last person detection. Accordingly, even when the sensitivity of the human detection sensor can detect only a narrow range due to performance, the lighting device can be brightly lit for a predetermined time without suddenly darkening, and the safety of the passing person is ensured. It is possible.

  Moreover, the illuminating device of said embodiment may be separately provided with the illuminance sensor which measures the illumination intensity around an illuminating device, and may control lighting of an illuminating device combining a human detection sensor and an illuminance sensor. FIG. 7 is an electric circuit diagram of a lighting device including an illuminance detection unit that is an illuminance sensor, and shows an example applied to the lighting device according to the first embodiment.

  As shown in the figure, an illuminance detection unit 43 is connected to the control unit 41. The illuminance detection unit 43 is connected to the power supply unit 40 via a lead wire (not shown), and current is supplied to the illuminance detection unit 43 from the power supply unit 40 which is a constant voltage power supply. Since the other configuration is the same as that of the first embodiment shown in FIG. 4, the same reference numerals as those in FIG. 4 are given to the corresponding structural members, and detailed description of the configuration and operation is omitted.

  With reference to FIG. 8, the control flow of lighting of the illuminating device combining the human detection sensor and the illuminance sensor will be described in detail.

  First, after the power is turned on, the control unit 41 opens and closes the transistor 76 with a small duty ratio (for example, 25%), and darkens the LEDs 2, 2,... (Step S11).

  Next, the output signal output by the light receiving unit 4 which is a human detection sensor whose power is turned on in conjunction with the illumination device and the illuminance detected by the illuminance detection unit 43 which is an illuminance sensor are respectively captured (step S12, S13). Furthermore, the presence / absence of infrared (human) detection is determined using the output signal captured in step S12 (step S14).

If it is determined in step S14 that infrared rays (people) are detected (step S14: YES), it is determined whether the illuminance captured in step S13 is equal to or greater than a preset value L _s (step S15). ).

If it is determined in step S15 that the illuminance is less than the preset value L _s (step S15: NO), the transistor 76 is opened and closed with a large duty ratio (for example, 100%), and the LED2, 2 is turned on brightly (step S16), and a timer separately installed in the lighting device is reset to 0 and started, and the time after detecting a person is measured (step S17).

On the other hand, when it is determined in step S14 that there is no detection of infrared rays (people) (step S14: NO), and when it is determined in step S15 that the illuminance is equal to or greater than a preset value L _s ( In step S15: YES), the LED 2, 2,...

  After starting the timer in step S17, the output signal output by the light receiving unit 4 is captured (step S18), and the presence or absence of infrared (human) detection is determined using the output signal captured in step S18. (Step S19).

  If it is determined in step S19 that infrared rays (people) are detected (step S19: YES), the process returns to step S17 and repeats a series of operations in a state where the LEDs 2, 2,.

  On the other hand, if it is determined in step S19 that there is no detection of infrared rays (people) (step S19: NO), it is determined whether or not the time set by the timer has elapsed (whether or not time is up) (step S19). S20).

  If it is determined in step S20 that the time is not up (step S20: NO), the process returns to step S18 and repeats a series of operations in a state where the LEDs 2, 2.

  If it is determined in step S20 that the time is up (step S20: YES), the process returns to step S11 and a series of operations are repeated until the power is shut off.

  As described above, the lighting device is a value in which the ambient illuminance is set in advance as a result of measuring the ambient illuminance by the illuminance sensor when the human detection sensor detects the infrared ray (people) and tries to light up brightly. If it is above, dark lighting will be continued as it is, and if the surrounding illuminance is smaller than the preset value, the lighting device will be brightly lit.

  For example, when the lighting device is turned on in the daytime or when the lighting device is installed in a bright place on the window side, a person can recognize an obstacle or the like without turning on the lighting device. Therefore, even when it is determined that it is necessary to light up by detecting infrared rays (people) by the human detection sensor, it is possible to sufficiently avoid danger by dark lighting. Therefore, by combining the human detection sensor and the illuminance sensor, it is possible to avoid unnecessarily brightly lighting the lighting device, so ensuring safety by assisting in recognition of obstacles etc. of people passing through the lighting device side. It becomes possible to drive the lighting device more effectively and with energy saving.

  In the above description, when the ambient illuminance is larger than the predetermined value, the lighting device is darkly controlled. However, in a bright place such as a window during the day, there is no need for dark lighting, Since an obstacle or the like can be recognized, the power of the lighting device may be turned off. Therefore, energy saving can be realized more effectively.

  Further, the above control method is a control method in which the illuminance on the irradiation surface is larger than a predetermined value when a person is detected. However, the illuminance is not limited to the dark lighting and the illuminance is within a predetermined range. It is also possible. Therefore, it is possible to achieve not only the purpose of avoiding danger but also the purpose of illumination when performing precise manual work.

  Further, even when the illuminance sensor is used alone without being combined with the human detection sensor, the lighting device can be driven with energy saving.

  The lighting device according to the above embodiment can be used as, for example, a large number of lighting devices installed in a large room. In this case, when there are a large number of people in the room, all the lighting devices are lit brightly.When only one person is in the room, the lighting devices in the vicinity are lit brightly, and other lighting devices are lit darkly. Contributes to energy saving and enables fine lighting according to the situation.

  Although the illuminating device which concerns on the above embodiment illustrated the illuminating device which used LED as a light source, it should just be a light source which can control brightness, and is not limited to LED.

  Furthermore, it goes without saying that the present invention can be implemented in variously modified forms within the scope of the matters described in the claims.

It is an external view of the illuminating device which concerns on Embodiment 1 of this invention. It is sectional drawing by the II-II line of FIG. It is the schematic of an LED board. It is an electric circuit diagram of an illuminating device. It is an electric circuit diagram of the illuminating device which concerns on Embodiment 2 of this invention. It is a flowchart of lighting control of the illuminating device which concerns on Embodiment 1 and 2 of this invention. It is an electric circuit diagram of an illuminating device provided with an illumination intensity sensor. In the illuminating device which concerns on Embodiment 1 and 2 of this invention, it is a flowchart of lighting control of the illuminating device at the time of using combining a human detection sensor and an illumination intensity sensor.

Explanation of symbols

2 LED (light source)
4 Light receiving part (human detection sensor, light receiving element)
41 Control unit (control means)
41a Pulse generation circuit 42 Infrared LED
43 Illuminance detection unit (illuminance sensor)
76 Transistor (switching element)

Claims (8)

A light source comprising an LED or the like, a human detection sensor for detecting a person, and a control means for controlling the brightness of the light source,
The control device controls the brightness of the light source to a darker brightness than usual when no person is detected by the human detection sensor.   A light source composed of an LED or the like, a human detection sensor for detecting a person, and when a person is detected by the human detection sensor, the light source is controlled to a normal brightness, and if the person is not detected by the human detection sensor, An illuminating device comprising: a control unit that controls a light source to a brightness that can recognize obstacles, steps, and the like that are darker than normal brightness. A light source comprising an LED or the like, a human detection sensor for detecting a person, and a control means for controlling the driving of the light source according to a detection result by the human detection sensor,
The illuminating device, wherein the control means is configured to light the light source brightly / darkly according to the presence / absence of a person detected by the human detection sensor.   A switching element that opens and closes to control driving of the light source is provided, and the control unit includes a pulse generation circuit that generates a pulse signal, depending on the presence / absence of a person detected by the human detection sensor. 4. The lighting device according to claim 1, wherein the pulse generation circuit is configured to generate a pulse signal having a duty ratio, and the switching element is operated by the generated pulse signal. 5.   The lighting device according to claim 1, wherein the human detection sensor includes a light receiving element that receives infrared rays.   The illumination device according to claim 5, further comprising an infrared LED that emits infrared light. Comprising an illuminance sensor for measuring the illuminance around the illumination device;
The lighting device according to claim 1, wherein when the ambient illuminance measured by the illuminance sensor is greater than a predetermined value, the light source is controlled to be darker than usual. A control method for an illuminating device comprising: a light source composed of an LED or the like; a human detection sensor that detects a person; and a control unit that controls the brightness of the light source,
The method for controlling an illuminating device, wherein the control means controls the brightness of the light source to a darker brightness than usual when no person is detected by the human detection sensor.

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