JP2012169147A - Lighting device and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform lighting control of a first light source according to one lighting control signal, and unlight the first light source reliably and light a second light source reliably when the signal value of the lighting control signal reaches a specified value.SOLUTION: In the lighting device 40 of a luminaire 10, when the duty ratio of a lighting control signal input by a lighting control signal detection circuit 70 is less than a threshold D1, a first lighting control unit 61 lights a first light source LA1 with a smaller light output as a duty ratio of the lighting control signal is larger, and a second lighting control unit 62 unlights a second light source LA2. When the duty ratio of the lighting control signal is equal to or larger than D1, the first lighting control unit 61 unlights the first light source LA1, and the second lighting control unit 62 lights the second light source LA2 with a smaller light output as a duty ratio of the lighting control signal is larger.

Description

  The present invention relates to a lighting device and a lighting device.

  There is a technique for dimming control of a main illumination light source and an auxiliary illumination light source based on a dimming control signal in an illuminating device (see, for example, Patent Document 1).

JP 2006-19060 A

  Reduction of useless light in recent lighting fixtures is important for energy saving and power saving. For this reason, the demand for dimming control of the lighting device, which is the means for realizing it, is increasing. As described in Patent Document 1, the lighting device and dimming control method for dimming control according to the dimming signal input from the outside can satisfy the needs of energy saving and power saving, and further different light sources. It is possible to enhance the rendering performance as a lighting device by controlling the light intensity.

  The illumination device described in Patent Document 1 is an illumination unit in which each light source is continuously dimmed by a dimming control signal, and is substantially continuous when the dimming control signal reaches a predetermined dimming rate. By switching the illumination light source so as to output a luminous flux, even if the illumination light source is switched from the main illumination light source to the auxiliary illumination light source or vice versa, the user feels uncomfortable due to a sense of discomfort. Do not give. However, in this conventional lighting device, the first light source and the second light source that irradiate light having different wavelengths are used, the first light source is dimmed according to one dimming signal, and the dimming is performed. When the signal value of the signal reaches a predetermined value, there is a problem that the first light source cannot be reliably turned off and the second light source cannot be reliably turned on.

  In the present invention, for example, the first light source is dimmed according to one dimming signal, and when the signal value of the dimming signal reaches a predetermined value, the first light source is reliably turned off and the second light source is turned off. The purpose is to ensure that it is lit.

A lighting device according to one aspect of the present invention includes:
In a lighting device that turns on a first light source and a second light source that emit light having different wavelengths,
An input unit for inputting a dimming signal subjected to pulse width modulation;
When the duty ratio of the dimming signal input by the input unit is less than a predetermined first threshold, the first light source is turned on with a smaller light output as the duty ratio of the dimming signal is larger, and the dimming signal is adjusted. A first lighting control unit that turns off the first light source when a duty ratio of an optical signal is equal to or greater than the first threshold;
When the duty ratio of the dimming signal input by the input unit is less than the second threshold equal to or greater than the first threshold, the second light source is turned off, and the duty ratio of the dimming signal is the second And a second lighting control unit that turns on the second light source.

  According to one aspect of the present invention, the second light source is turned off while the first light source is turned on, and the second light source is turned on while the first light source is turned off. In addition, by reliably performing the turn-off control, it is possible to eliminate a malfunction when the user operates the first light source and the second light source. Moreover, power consumption can be reduced by efficiently performing lighting control of the first light source and the second light source.

1 is a perspective view of a lighting device according to Embodiment 1. FIG. (A) The perspective view of the light source part and light distribution control part of an illuminating device which concern on Embodiment 1, (b) The top view of the light source part of an illuminating device. FIG. 2 is a block diagram illustrating a configuration of a lighting device according to Embodiment 1. 6 is a graph showing a first example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit according to the first embodiment. 6 is a graph showing a second example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit according to Embodiment 1. 8 is a graph showing a third example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit according to the first embodiment. FIG. 3 is a block diagram showing a first example of a detailed configuration of the lighting apparatus according to Embodiment 1. 5 is a flowchart showing an example of operation of a lighting control unit of the lighting apparatus according to Embodiment 1; FIG. 4 is a block diagram showing a second example of a detailed configuration of the lighting apparatus according to Embodiment 1. FIG. 6 is a circuit diagram showing a second example of a detailed configuration of the lighting apparatus according to Embodiment 1. FIG. 6 is a block diagram illustrating a configuration of a lighting device according to Embodiment 2. (A) The perspective view of the light source part and light distribution control part of Embodiment 3 which concerns on Embodiment 3, (b) A sectional drawing of an illuminating device, (c) The top view of the light source part of an illuminating device. (A) The perspective view of the light source part and light distribution control part of an illuminating device which concern on Embodiment 4, (b) A sectional view of an illuminating device, (c) The top view of the light source part of an illuminating device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a lighting device 10 according to the present embodiment. FIG. 2A is a perspective view of the light source unit 20 and the light distribution control unit 30 of the lighting device 10. FIG. 2B is a top view of the light source unit 20.

  In FIG. 1, the lighting device 10 includes a housing 11, a diffusion plate 12, and a cover 13. Inside the housing 11, a plurality of light source units 20 and light distribution control units 30 shown in FIG. 2A are arranged side by side, and a lighting device and the like to be described later are accommodated. The diffusing plate 12 is attached in front of the light distribution control unit 30, diffuses the light emitted from the light source unit 20 through the light distribution control unit 30 and radiates the light to the outside of the apparatus. The cover 13 is opened according to the shape of the diffusion plate 12 and is attached to the front surface of the housing 11 with screws 14. In the description of this embodiment, directions such as “front”, “back”, “up”, “down”, “left”, and “right” are simply written as such for convenience of explanation. The arrangement and orientation of the lighting device 10 and each part of the lighting device 10 are not limited. For example, if the lighting device 10 is installed on the ceiling, the above “top” in the “top view” and “front” in the “front” and “front” are all “down” in the installation state of the lighting device 10. "".

  2A and 2B, the light source unit 20 includes a first light source LA1, a second light source LA2, a substrate 21, and a connector 22. The light distribution control unit 30 includes a plurality of window portions 31 (reflectors).

  The first light source LA1 is a plurality of visible light LEDs that emit visible light, and specifically, a white LED group. The second light source LA2 is a plurality of ultraviolet LEDs that irradiate ultraviolet light as light having a wavelength different from that of the first light source LA1, that is, a group of ultraviolet LEDs. On the substrate 21, the first light source LA1 and the second light source LA2 are alternately mounted in a straight line and in a line. The connector 22 electrically connects the board 21 to the lighting device directly or via another board. Note that the first light source LA1 and the second light source LA2 may be light sources of emission colors other than white light and ultraviolet light, respectively, or may be light sources other than LEDs such as EL. . The arrangement of the first light source LA1 and the second light source LA2 may not be linear, may not be one row, and the first light source LA1 and the second light source LA2 are alternately arranged. It is not necessary to line up. The number of mounted LEDs of the first light source LA1 and the second light source LA2 may be two or less or four or more, and the first light source LA1 and the second light source LA2 are configured by different numbers of LEDs. May be.

  The light distribution control unit 30 covers the light source unit 20 from above, and controls the light distribution from the first light source LA1 and the second light source LA2 by the window unit 31. The light distribution control unit 30 is made of a highly light-blocking resin so as not to leak light emitted from the first light source LA1 and the second light source LA2. The light distribution control unit 30 is made of a material that does not deteriorate with ultraviolet rays from the second light source LA2. The window unit 31 corresponds to the first light source LA1 (white LED group) and the second light source LA2 (ultraviolet LED group) on a one-to-one basis. The window part 31 is provided in the same position as one corresponding LED, and performs light distribution control of the light irradiated from the LED. The window portion 31 has a cylindrical shape whose inner surface is inclined at a predetermined angle so that desired light distribution characteristics can be obtained. The light emitted from the LED is reflected by the inner surface of the window portion 31 and diffused light from the window portion 31 can be obtained when the angle is in a cylindrical shape.

  FIG. 3 is a block diagram illustrating a configuration of the illumination device 10.

  In FIG. 3, the lighting device 10 includes a lighting device 40. The lighting device 40 includes a lighting circuit unit 50, a lighting control unit 60, and a dimming signal detection circuit 70 (input unit). The lighting circuit unit 50 is supplied with power from an external commercial power supply AC. The dimming signal detection circuit 70 is supplied with a dimming signal subjected to pulse width modulation (PWM), that is, a PWM signal, from an external dimmer 90. The lighting circuit unit 50 includes a first lighting circuit 51 and a second lighting circuit 52, and the first lighting circuit 51 is connected to the first light source LA 1, and the second lighting circuit 52 is connected to the second lighting circuit 52. The light source LA2 is connected.

  The lighting control unit 60 receives the output of the dimming signal detection circuit 70 that has detected the PWM signal, and outputs a lighting control command according to the PWM signal to the lighting circuit unit 50. The first lighting circuit 51 and the second lighting circuit 52 generate electric power according to the PWM signal from the input power supply, and supply the electric power to the first light source LA1 and the second light source LA2, respectively.

  FIG. 4 is a graph showing a first example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit 20.

  In FIG. 4, the horizontal axis represents the on-duty ratio of the PWM signal (dimming signal) input from the dimmer 90, and the vertical axis represents the on-duty ratio as an output obtained from the lighting device 40. The light outputs of the corresponding first light source LA1 and second light source LA2 are shown. Note that the PWM signal off-duty ratio may be used instead of the PWM signal on-duty ratio.

  The relationship between the on-duty ratio of the PWM signal and the light output emitted by the first light source LA1 is such that when the on-duty ratio is increased, the light output decreases in proportion to the on-duty ratio. . When the on-duty ratio exceeds D1 (for example, 97%), the first lighting circuit 51 turns off the first light source LA1. Further, the second lighting circuit 52 turns off the second light source LA2 and turns off the first light source LA1 during the on-duty ratio period in which the first lighting circuit 51 lights the first light source LA1. When controlled in this manner, the second light source LA2 is turned on. That is, when the on-duty ratio exceeds D1, the second lighting circuit 52 lights the second light source LA2. The relationship between the on-duty ratio of the PWM signal and the light output emitted from the second light source LA2 is such that the light output is constant even when the on-duty ratio increases. When the on-duty ratio reaches D3 (for example, 100%), the second lighting circuit 52 turns off the second light source LA2.

  If the lighting device 10 according to this example is installed on the ceiling of a room in which a picture is drawn on a wall with, for example, fluorescent paint, the room is brightly illuminated when the white LED group is lit, and the wall of the room is illuminated when the ultraviolet LED group is lit. The effect of creating a wall picture by illuminating is obtained.

  FIG. 5 is a graph showing a second example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit 20.

  The difference between FIG. 4 and FIG. 5 is the relationship between the on-duty ratio of the PWM signal and the optical output of the second light source LA2. In FIG. 4, the second light source LA2 is lit at a fixed output regardless of the on-duty ratio, but in FIG. 5, the light output of the second light source LA2 is on-duty in the same manner as the first light source LA1. It becomes smaller in proportion to the ratio.

  In this example, when the on-duty ratio exceeds D1 (for example, 80%), the first lighting circuit 51 turns off the first light source LA1, and at the same time, the second lighting circuit 52 The light source LA2 is turned on. When the on-duty ratio reaches D3 (for example, 100%), the second lighting circuit 52 turns off the second light source LA2.

  If the lighting device 10 according to this example is installed on the ceiling of a room in which a picture is drawn on the wall with, for example, a fluorescent paint, the above-described effects can be further enhanced.

  FIG. 6 is a graph showing a third example of the relationship between the duty ratio of the dimming signal and the light output of the light source unit 20.

  The difference between FIG. 5 and FIG. 6 is the relationship between the timing of turning off the first light source LA1 and the timing of turning on the second light source LA2. In FIG. 5, the timing at which the first light source LA1 is turned off and the timing at which the second light source LA2 is turned on are the same. In FIG. 6, when the on-duty ratio increases, the first light source LA1 is first turned off, and then when the on-duty ratio further increases, the second light source LA2 is turned on.

  In this example, when the on-duty ratio exceeds D1 (for example, 80%), the first lighting circuit 51 turns off the first light source LA1. When the on-duty ratio exceeds D2 (for example, 83%), the second lighting circuit 52 lights the second light source LA2. When the on-duty ratio reaches D3 (for example, 100%), the second lighting circuit 52 turns off the second light source LA2.

As described above, in this example, the first light source LA1 also has an on-duty ratio between a section (period) in which the first light source LA1 is lit and a section (period) in which the second light source LA2 is lit. A section (period) in which the second light source LA2 is also extinguished is provided. Therefore, if the lighting device 10 according to the present example is installed on the ceiling of a room where a picture is drawn on the wall with a fluorescent paint, for example, the white LED group is always turned off when the ultraviolet LED group is turned on. Such a production effect can be obtained with certainty.
In addition, since the ultraviolet LED is turned off while the white LED is lit, there is a problem that the user does not notice that the ultraviolet LED is lit because of the visible light emitted from the white LED. Does not occur.

  Note that the relationship between the duty ratio of the PWM signal and the light output of the light source unit 20 is not limited to that shown in FIGS. 4, 5, and 6. For example, the rate of change of the light output with respect to the on-duty ratio may be curved instead of linear according to the light output characteristics of the light source itself.

  FIG. 7 is a block diagram illustrating a first example of a detailed configuration of the illumination device 10.

  In FIG. 7, the lighting control unit 60 includes a microcomputer, and the microcomputer includes a first lighting control unit 61, a second lighting control unit 62, a duty ratio detection unit 63, and a determination unit 64.

  The dimming signal detection circuit 70 has a resistor R1 connected at one end to the dimmer 90, a capacitor C1 connected to the other end of the resistor R1 and the dimmer 90, and the resistor R1 and the capacitor C1. A resistor R2 having one end connected to the connection point and a diode bridge DB1 connected to the resistor R2 are provided. Even if the polarity of the dimmer 90 connected to the dimming signal detection circuit 70 is incorrect, the diode bridge DB1 changes the polarity of the signal input to the switching circuit 80 connected to the subsequent stage of the diode bridge DB1. It is for making it the same.

  The switching circuit 80 includes a photocoupler PC in which a light emitting diode portion is connected to the diode bridge DB1 of the dimming signal detection circuit 70 and the phototransistor portion is switched (ON / OFF) in response to the dimming signal (PWM signal). . The switching circuit 80 converts the voltage input from the control power supply VDD via the resistor R3 into a rectangular wave voltage by the switching operation of the photocoupler PC, and outputs it as a PWM control signal. The PWM control signal is a signal obtained by inverting the dimming signal, but the frequency and duty ratio are the same.

  The duty ratio detection unit 63 receives the PWM control signal output from the switching circuit 80. The determination unit 64 determines the PWM control signal detected by the duty ratio detection unit 63 and gives a command corresponding to the dimming signal to the first lighting control unit 61 and the second lighting control unit 62. The first lighting control unit 61 outputs lighting control, dimming control, and extinguishing control signals to the first lighting circuit 51. The second lighting control unit 62 outputs lighting control, dimming control, and extinguishing control signals to the second lighting circuit 52.

  FIG. 8 is a flowchart illustrating an example of the operation of the lighting control unit 60.

  FIG. 8 shows a control flow in the case where the relationship between the on-duty ratio of the dimming signal and the light output of the first light source LA1 and the second light source LA2 is as shown in FIG.

  In step S11, the duty ratio detector 63 detects the duty ratio D of the PWM control signal.

  In step S12, the determination unit 64 determines whether the duty ratio D detected in step S11 is greater than D1 (an example of the first threshold value and the second threshold value). If the duty ratio D is equal to or less than D1, the process proceeds to step S13. If the duty ratio D is greater than D1, the process proceeds to step S16.

  In step S <b> 13, the first lighting control unit 61 performs lighting control of the first lighting circuit 51. In step S <b> 14, the first lighting control unit 61 performs the dimming control of the first lighting circuit 51 by specifying the dimming rate according to the duty ratio D. In step S <b> 15, the second lighting control unit 62 performs the extinction control of the second lighting circuit 52.

  In step S <b> 16, the determination unit 64 determines whether the duty ratio D detected in step S <b> 11 is smaller than D <b> 3 (third threshold example). If the duty ratio D is smaller than D3, the process proceeds to step S17. If the duty ratio D is equal to or greater than D3, the process proceeds to step S20.

  In step S <b> 17, the second lighting control unit 62 performs lighting control of the second lighting circuit 52. In step S <b> 18, the second lighting control unit 62 performs the dimming control of the second lighting circuit 52 by specifying the dimming rate according to the duty ratio D. In step S <b> 19, the first lighting control unit 61 controls the turning off of the first lighting circuit 51.

  In step S <b> 20, the first lighting control unit 61 controls the turning off of the first lighting circuit 51. In step S <b> 21, the second lighting control unit 62 controls the turning off of the second lighting circuit 52.

  As described above, in this example, when the duty ratio of the dimming signal (PWM control signal) input by the dimming signal detection circuit 70 is less than the predetermined first threshold value D1, the first lighting control unit 61 is used. As the duty ratio of the dimming signal increases, the first light source LA1 is turned on with a smaller light output, and the second lighting control unit 62 turns off the second light source LA2. When the duty ratio of the dimming signal is greater than or equal to D1 and less than the third threshold value D3 greater than D1, the first lighting control unit 61 turns off the first light source LA1, and the second lighting control unit 62 As the duty ratio of the dimming signal is larger, the second light source LA2 is turned on with a smaller light output. When the duty ratio of the dimming signal is D3 or more, the second lighting control unit 62 turns off the second light source LA2.

  According to the present embodiment, the second light source LA2 is turned off while the first light source LA1 is turned on, and the second light source LA2 is turned on when the first light source LA1 is turned off. By reliably performing the on / off control, it is possible to eliminate malfunction when the user operates the first light source LA1 and the second light source LA2. Moreover, power consumption can be reduced by efficiently performing lighting control of the first light source LA1 and the second light source LA2.

  If the relationship between the on-duty ratio of the dimming signal and the light output of the first light source LA1 and the second light source LA2 is as shown in FIG. 4, the duty ratio of the dimming signal is greater than or equal to D1. And when it is less than D3, the 2nd lighting control part 62 makes 2nd light source LA2 light with a fixed light output irrespective of the magnitude | size of the duty ratio of a light control signal.

  If the relationship between the on-duty ratio of the dimming signal and the light output of the first light source LA1 and the second light source LA2 is as shown in FIG. 6, the duty ratio of the dimming signal is equal to or greater than D1. And when it is less than 2nd threshold value D2 larger than D1, the 2nd lighting control part 62 turns off 2nd light source LA2. When the duty ratio of the dimming signal is greater than or equal to D2 and less than D3 greater than D2, the second lighting control unit 62 turns on the second light source LA2 with a smaller light output as the duty ratio of the dimming signal increases. .

  FIG. 9 is a block diagram illustrating a second example of a detailed configuration of the illumination device 10.

  FIG. 9 differs from FIG. 7 in that the illumination device 10 has a circuit configuration that does not use a microcomputer for the lighting control unit 60. The lighting control unit 60 includes a time integration circuit 65, a diode DD, a peak voltage detection circuit 66, a first lighting control circuit 67 (first lighting control unit), an inversion unit 68, and a second lighting control circuit. 69 (second lighting control unit). The description of the same components as those in the example of FIG. 7 is omitted.

  The time integration circuit 65 receives the PWM control signal output from the switching circuit 80, integrates the PWM control signal, generates a DC voltage having a substantially flat waveform, and uses the generated DC voltage as the first lighting circuit. 51 and the second lighting circuit 52. The peak voltage detection circuit 66 receives the PWM control signal output from the switching circuit 80 via the diode DD, and detects the peak voltage of the input PWM control signal. The peak voltage detection circuit 66 is connected to the first turn-off control circuit 67 and the second turn-off control circuit 69. The first turn-off control circuit 67 and the second turn-off control circuit 69 perform the turn-off control of the first lighting circuit 51 and the second lighting circuit 52, respectively, according to the signal output from the peak voltage detection circuit 66. The inversion unit 68 inverts the signal from the peak voltage detection circuit 66 to cause the second turn-off control circuit 69 to perform an operation opposite to that of the first turn-off control circuit 67 (for turn-off control, turn-off control and turn-off control). Lighting control). For this reason, when the first lighting circuit 51 is lighting the first light source LA1, the second lighting circuit 52 turns off the second light source LA2, and the second lighting circuit 52 is the second light source. When LA2 is turned on, the first lighting circuit 51 turns off the first light source LA1.

  FIG. 10 is a circuit diagram illustrating a second example of a detailed configuration of the illumination device 10.

  FIG. 10 shows an implementation example of the configuration of FIG.

  The switching circuit 80 includes an amplifier circuit 81 for amplifying a signal output from the photocoupler PC in addition to the same photocoupler PC as in the example of FIG.

  The amplifier circuit 81 includes resistors R4 and R5, a capacitor C2, an inverting switching unit 82 including a switching element Q1 (MOS-FET), and an output switching unit 83 including switching elements Q2 and Q3 (MOS-FET) and resistors R6 and R7. With. The inversion switching unit 82 performs switching according to the output of the photocoupler PC, and outputs an inverted signal obtained by inverting the output waveform of the photocoupler PC. The output switching unit 83 receives the inverted signal, further inverts it to have the same phase as the output waveform of the photocoupler PC, and outputs a PWM control signal having a higher signal level than the output of the photocoupler PC. Thereby, when the level of the output signal output from the photocoupler PC is low, it is possible to prevent the subsequent time integration circuit 65 and the peak voltage detection circuit 66 from malfunctioning. Note that when the level of the output signal output from the photocoupler PC is high and the time integration circuit 65 and the peak voltage detection circuit 66 are not likely to malfunction, the amplifier circuit 81 may be omitted.

  The time integration circuit 65 is an integration circuit including a resistor R8 and a capacitor C3 connected to the resistor R8. The peak voltage detection circuit 66 includes a capacitor C4 connected to the diode DD, a resistor R9 connected to the capacitor C4, a transistor Q4 having a base terminal connected to the resistor R9, and a base terminal and an emitter of the transistor Q4. A resistor R10 connected in parallel to the terminal and a resistor R11 connected to the collector terminal of the transistor Q4 are provided. The first extinguishing control circuit 67 includes a switching element Q5 (MOS-FET) whose gate terminal is connected to the collector terminal of the transistor Q4 of the peak voltage detection circuit 66, and a resistor R12 connected to the drain terminal of the switching element Q5. With. The inversion unit 68 shares the transistor Q4 of the peak voltage detection circuit 66. The second extinguishing control circuit 69 includes a resistor R13 connected to the collector terminal of the transistor Q4.

  Here, a voltage obtained by switching the control power supply VDD by the photocoupler PC is set as a PWM control signal V1. The PWM control signal V1 is input to the time integration circuit 65 and also input to the peak voltage detection circuit 66 through the diode DD. The peak voltage detection circuit 66 is driven by the transistor Q4.

  The dimming control signal output from the time integration circuit 65 is calculated by a DC voltage obtained by time integration of the PWM control signal V1, that is, (voltage of the control power supply VDD) × (on-duty ratio of the PWM control signal V1). Signal. The time constant between the resistor R8 and the capacitor C3 needs to be equal to or longer than the period of the rectangular wave voltage obtained by the PWM control signal V1, that is, the period of the PWM signal.

When the PWM control signal V1 is HI, the capacitor C4 of the peak voltage detection circuit 66 is
The battery is charged up to a peak voltage calculated by (voltage of control power supply VDD) − (specific forward voltage VF of diode DD). When the PWM control signal V1 is LOW, discharge is performed from the peak voltage with the discharge time constant of the resistors R9, R10 and the capacitor C4, and a drive signal for the transistor Q4 of the peak voltage detection circuit 66 is output. Since the first turn-off control circuit 67 performs the turn-off control operation by driving the transistor Q4, the first turn-off control circuit 67 does not operate if the capacitor C4 is charged with a potential equal to or higher than the drive threshold voltage of the transistor Q4. The control circuit 69 performs an extinguishing control operation because the transistor Q4 is on.

  Next, the case where the on-duty ratio of the PWM signal is 100% will be described.

  Since the potential obtained from the peak voltage detection circuit 66 disappears, the transistor Q4 is turned off, the switching element Q5 is turned on, the first turn-off control circuit 67 is operated, and the second turn-off control circuit 69 is not operated. . At this time, it is assumed that the turn-off control operations of the first turn-off control circuit 67 and the second turn-off control circuit 69 based on the on-duty ratio are performed when the on-duty ratio of the PWM signal is 93% or more, for example. The discharge time constant of the resistors R9, R10 and the capacitor C4 is set to be equal to or longer than the LOW period of the PWM control signal V1, and the voltage of the capacitor C4 is set lower than the ON voltage of the transistor Q4 during the LOW period of the PWM control signal V1. Transistor Q4 is turned off.

  For example, if the relationship between the voltage of the capacitor C4 during the HI period of the PWM control signal V1 and the ON voltage of the transistor Q4 is reversed (the voltage of the capacitor C4 ≧ the ON voltage of the transistor Q4), the lighting control is performed in a predetermined dimming state. During this time, the first extinguishing control circuit 67 and the second extinguishing control circuit 69 malfunction. Therefore, it is desirable to set the discharge time constant as one period or more of the PWM signal.

  Further, the discharge time constant is a response time until the circuit actually performs the extinguishing control and the lighting control when the lighting operation of the first light source LA1 and the second light source LA2 is switched. It is desirable to set no time.

  A common signal is input to the first lighting circuit 51 and the second lighting circuit 52 as the dimming control signal. On the other hand, since the extinction control signal is input to each of the first lighting circuit 51 and the second lighting circuit 52, if the common dimming control signal is input, the first light source LA1 and the second light source Dimming control according to the on-duty ratio with LA2 is possible.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 11 is a block diagram illustrating a configuration of the illumination device 10 according to the present embodiment.

  The lighting device 10 includes a first lighting device 41 and a second lighting device 42 as the lighting device 40. The first lighting device 41 includes a first lighting circuit 51 and a first lighting control unit 61. The second lighting device 42 includes a second lighting circuit 52 and a second lighting control unit 62.

  The 1st lighting circuit 51 and the 2nd lighting circuit 52 supply electric power to 1st light source LA1 and 2nd light source LA2 which are connected based on the alternating current power supply input from common commercial power supply AC, respectively. The first lighting control unit 61 and the second lighting control unit 62 perform the same control as in the first embodiment according to the dimming signal (PWM signal) input from the common dimmer 90.

  In this way, the lighting device 40 may be divided into two devices and mounted.

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  The appearance of lighting apparatus 10 according to the present embodiment is the same as that of the first embodiment shown in FIG.

  FIG. 12A is a perspective view of the light source unit 20 and the light distribution control unit 30 of the lighting device 10. FIG. 12B is a cross-sectional view of the lighting device 10 taken along line A. FIG. 12C is a top view of the light source unit 20.

  12A to 12C, the light source unit 20 includes a first light source LA1, a second light source LA2, a substrate 21, and a connector 22 as in the first embodiment. Similar to the first embodiment, the light distribution control unit 30 includes a plurality of window portions 31 (reflectors).

  In the present embodiment, one second light source LA2 (ultraviolet LED group) is arranged in the vicinity of each of the first light sources LA1 (white LED group). The window portion 31 corresponds to the first light source LA1 on a one-to-one basis. That is, one white LED and one ultraviolet LED are arranged in the same window portion 31. The window part 31 controls the light distribution of light emitted from one corresponding white LED and one ultraviolet LED arranged in the vicinity of the white LED.

  The angle of the inner surface of the window portion 31 is different between the B side on which the white LED is arranged and the C side on which the ultraviolet LED is arranged in the vicinity. Here, the C side is steeper with respect to the substrate 21 than the B side. Therefore, the light emitted from the ultraviolet LED gathers in the direction of the C side compared to the light emitted from the white LED. Therefore, for example, if the lighting device 10 is installed on the ceiling, the ultraviolet LED is mainly different from the first direction while the white LED illuminates mainly directly below (predetermined first direction). (Second direction) can be illuminated. That is, the window unit 31 performs light distribution control of light emitted from one white LED in a downward direction, and controls light distribution from an ultraviolet LED disposed in the vicinity of the white LED in a lateral direction. Can do.

  If the lighting device 10 according to the present embodiment is installed on the ceiling of a room where a picture is drawn on a wall with, for example, fluorescent paint, the white LED group illuminates the entire room brightly, and the ultraviolet LED group illuminates. A directing effect can be obtained in which only the wall of the room is illuminated and the picture on the wall is clearly revealed.

Embodiment 4 FIG.
The difference between the present embodiment and the second embodiment will be mainly described.

  The appearance of lighting apparatus 10 according to the present embodiment is the same as that of the first embodiment shown in FIG.

  FIG. 13A is a perspective view of the light source unit 20 and the light distribution control unit 30 of the lighting device 10. FIG. 13B is a cross-sectional view of the lighting device 10 taken along line A. FIG. 13C is a top view of the light source unit 20.

  13A to 13C, the light source unit 20 includes a first light source LA1, a second light source LA2, a substrate 21, and a connector 22 as in the second embodiment. Similar to the second embodiment, the light distribution control unit 30 includes a plurality of window portions 31 (reflectors).

  In the present embodiment, two second light sources LA2 (ultraviolet LED groups) are arranged in the vicinity of each of the first light sources LA1 (white LED groups) so as to sandwich the first light source LA1. The window part 31 controls the light distribution from the corresponding one white LED and the two ultraviolet LEDs arranged on both sides of the white LED.

  The inner side surface of the window portion 31 forms a paraboloid. Therefore, the light emitted from the white LED and the light emitted from the ultraviolet LED can be emitted in substantially the same direction. Therefore, uniform light is obtained as illumination from the illumination device 10 according to the present embodiment.

  As mentioned above, although embodiment of this invention was described, you may implement combining 2 or more embodiment among these. Alternatively, one of these embodiments may be partially implemented. Or you may implement combining two or more embodiment among these partially.

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 Housing | casing, 12 Diffuser plate, 13 Cover, 14 Screw, 20 Light source part, 21 Substrate, 22 Connector, 30 Light distribution control part, 31 Window part, 40 Lighting device, 41 1st lighting device, 42 Second lighting device, 50 lighting circuit unit, 51 first lighting circuit, 52 second lighting circuit, 60 lighting control unit, 61 first lighting control unit, 62 second lighting control unit, 63 duty ratio detection Unit, 64 determination unit, 65 time integration circuit, 66 peak voltage detection circuit, 67 first light extinction control circuit, 68 inversion unit, 69 second light extinction control circuit, 70 dimming signal detection circuit, 80 switching circuit, 81 amplification Circuit, 82 inverting switching unit, 83 output switching unit, 90 dimmer, AC commercial power supply, C1-C4 capacitor, DD diode, DB1 diode bridge Di, LA1 first light source, LA2 second light source, PC photocoupler, Q1 to Q3, Q5 switching elements, Q4 transistor, R1 to R13 resistors.

Claims (8)

In a lighting device that turns on a first light source and a second light source that emit light having different wavelengths,
An input unit for inputting a dimming signal subjected to pulse width modulation;
When the duty ratio of the dimming signal input by the input unit is less than a predetermined first threshold, the first light source is turned on with a smaller light output as the duty ratio of the dimming signal is larger, and the dimming signal is adjusted. A first lighting control unit that turns off the first light source when a duty ratio of an optical signal is equal to or greater than the first threshold;
When the duty ratio of the dimming signal input by the input unit is less than the second threshold equal to or greater than the first threshold, the second light source is turned off, and the duty ratio of the dimming signal is the second And a second lighting control unit that turns on the second light source when it is equal to or greater than the threshold value.   When the duty ratio of the dimming signal input from the input unit is greater than or equal to the second threshold, the second lighting control unit decreases the second light source as the duty ratio of the dimming signal increases. The lighting device according to claim 1, wherein the lighting device is turned on with light output.   The lighting device according to claim 1, wherein the second threshold value is the same value as the first threshold value.   The lighting device according to claim 1, wherein the second threshold value is larger than the first threshold value.   An illumination device comprising: the lighting device according to claim 1, the first light source, and the second light source. The first light source is a plurality of visible light LEDs that emit visible light,
The illumination device according to claim 5, wherein the second light source is a plurality of ultraviolet LEDs that irradiate ultraviolet light. The plurality of ultraviolet LEDs are arranged at least one near each of the plurality of visible LEDs,
The illumination device further includes a plurality of windows corresponding one-to-one to the plurality of visible light LEDs, each of which is disposed in the vicinity of one of the plurality of visible light LEDs and the visible light LED. The illumination device according to claim 6, further comprising: a light distribution control unit having a plurality of window portions for controlling light distribution from the light LED.   The plurality of window portions each control light distribution in a predetermined first direction from light emitted from one of the plurality of visible light LEDs, and from an ultraviolet light LED disposed in the vicinity of the visible light LED. The illumination device according to claim 7, wherein light distribution is controlled in a second direction different from the first direction.

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