JP2013168382A - Lighting device and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device readily adjustable in light color and illuminance of an illuminating light.SOLUTION: A control signal input unit 20 and a drive signal converting unit 23 determine a light quantity of each of light emitting elements 3R, 3G and 3B of an illuminating light source 3 so that, in a range less than a predetermined color temperature, the color temperature and light quantity of illuminating light increase/decrease in an interlocked manner corresponding to change in operation input (the operation amount of an operation unit 11). The control signal input unit 20 and the drive signal converting unit 23 determine the light quantity of each of the light emitting elements 3R, 3G and 3B of the illuminating light source 3 so that, in a range more than the predetermined color temperature, the color temperature of the illuminating light increases/decreases corresponding to the change in the operation input while maintaining the light quantity within a predetermined range. Thus, light color (the color temperature) and illuminance (the quantity of light) of the illuminating light can be adjusted more easily than in the prior art in which a person has adjusted each quantity of light for every color.

Description

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

  Traditionally, bright blue-white light (light with high color temperature) such as a daylight fluorescent lamp refreshes the person's mood, but if the illumination is too low, it feels gloomy and cold, while an incandescent lamp It is known that the reddish light (light with low color temperature) has a mild effect when the illuminance is low, and it is harsh and uncomfortable when the illuminance is too high (Krusov effect). (See FIG. 7). And paying attention to such a psychological effect, various illumination devices in which the light color (color temperature) of illumination light is variable are provided.

  For example, Patent Document 1 includes a lighting unit having a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and a control unit that drives the light emitting diodes of each color of the lighting unit and adjusts the amount of light (illuminance). The light intensity (color temperature) of the illumination light (mixed color light) is made variable by adjusting the light quantity of each color (red, green, blue) separately by operating the operation part provided for each color in the unit. A lighting device is described.

JP 2008-293946 A

  However, in the conventional example described in Patent Document 1, the user himself / herself operates the three operation units of the control unit to adjust the light amounts of red, green, and blue to set the color temperature of the mixed color light. Therefore, it is not easy to set a desired light color (color temperature). Moreover, as shown in FIG. 7, the psychological effect varies depending on the illuminance (light quantity) even at the same color temperature, so that the light color (color temperature) and the illuminance (light quantity) are changed even if the user tries to obtain the desired psychological effect. It is very difficult to adjust properly.

  This invention is made | formed in view of the said situation, The objective is to provide the lighting device and illuminating device which can adjust the light color and illumination intensity of illumination light easily.

  The lighting device of the present invention is a lighting device that lights a plurality of light emitting elements that emit light of different colors and controls the color temperature and light quantity of the combined light, and a control signal that indicates the color temperature and light quantity is provided. A control signal input unit that is input from the outside and outputs a DC voltage corresponding to the control signal, a drive signal conversion unit that converts the DC voltage into a drive signal for driving a plurality of light emitting elements, and the drive signal A plurality of light emitting element driving units for driving each light emitting element, and in a range where the relationship between the color temperature of the combined light and the light amount is less than a predetermined color temperature, the color temperature and the light amount increase as the color temperature increases. When the relationship between the color temperature of the synthesized light and the amount of light is greater than or equal to the specified color temperature, the control signal input unit is driven so that the amount of light falls within the specified range when the color temperature increases or decreases. The signal converter is the relationship between color temperature and light quantity Determination characterized in that it.

  In this lighting device, the control signal input unit and the drive signal conversion unit increase and decrease in conjunction with each other so as to protrude downward when the color temperature is on the horizontal axis and the light quantity is on the vertical axis in the range below the predetermined color temperature. It is preferable to do.

  The lighting device according to the present invention, the lighting device, emits light of different colors, receives a plurality of light emitting elements that are turned on by the lighting device, and receives an operation input by a person, and controls the color temperature and the light amount It comprises an operation input receiving means for outputting a signal.

  In this lighting device, it is preferable that the change in the operation amount of the operation input received by the operation input receiving means and the difference between the reciprocal color temperatures of the combined light have a proportional relationship in the range of the predetermined color temperature or higher.

  The lighting device and the lighting device of the present invention have an effect that the light color and illuminance of the illumination light can be easily adjusted.

1 shows Embodiment 1 of the present invention, where (a) is an overall configuration diagram, (b) is a block diagram of a power supply unit, and (c) is a circuit configuration diagram of an LED drive unit. (A), (b) is explanatory drawing explaining the relationship between the operation amount of the operation part in the same as the above, and color temperature. It is operation | movement explanatory drawing same as the above. It is a block diagram which shows another structure of the power supply unit in the same as the above. Embodiment 2 of this invention is shown, (a) is a whole block diagram, (b) is a block diagram of a power supply unit. It is a block diagram which shows another structure of the power supply unit in the same as the above. It is explanatory drawing for demonstrating the psychological effect (Krusov effect) with respect to the color temperature and illumination intensity of illumination light.

(Embodiment 1)
As shown in FIG. 1A, the illumination device of the present embodiment includes an illumination light source 3, a controller 1, and a power supply unit 2 corresponding to a lighting device. The illumination light source 3 includes light emitting elements (light emitting diodes) 3R, 3G, and 3B of three colors of red (R), green (G), and blue (B). However, the three color light emitting elements may be light emitting elements other than the light emitting diodes, for example, organic EL elements. Here, the chromaticity coordinates of the light colors of the light emitting elements 3R, 3G, and 3B of the respective colors are (x _R , y _R ), (x _G , y _G ), and (x _B , y _B ), respectively. If the light amounts of 3R, 3G, and 3B are Y _R , Y _G , and Y _B , respectively, the chromaticity coordinates (x ₀ , y ₀ ) and the light amount Y ₀ of the light color of the illumination light that is mixed color light are as follows: It is represented by the number 1.

Here, for the light emitting elements 3R, 3G, and 3B made of light emitting diodes, the light color (wavelength of light) does not change even if the light amounts Y _R , Y _G , and Y _B are changed, and therefore the light amounts of the light emitting elements 3R, 3G, and 3B. By changing the ratio of Y _R , Y _G , Y _B , the light color of the illumination light (synthetic light) obtained as a mixed color can be changed, and the light amounts Y _R , Y of the light emitting elements 3R, 3G, 3B can be changed. _G, the amount of light while maintaining the ratio of Y _B Y _R, Y _G, be changed to Y _B, it is possible to change the amount of illumination light in the same light color. Since the light amounts Y _R , Y _G , Y _B of the light emitting elements 3R, 3G, 3B made of light emitting diodes are determined by the power supply amount, the power supply amount supplied from the power supply unit 2 to the light emitting elements 3R, 3G, 3B as described later. By increasing or decreasing, the light color and the light amount of the illumination light can be adjusted. Here, by determining the light amounts Y _R , Y _G , Y _B of the light emitting elements 3R, 3G, 3B of the illumination light source so that the chromaticity of the illumination light changes substantially along the black body locus, Light color can be specified by color temperature.

  As shown in FIG. 1B, the power supply unit 2 includes a control signal input unit 20 that receives a control signal from the controller 1, and an AC / DC that converts an AC voltage fed through the controller 1 into a desired DC voltage. Conversion unit 21, green LED driving unit 22G for driving green light emitting element 3G, red LED driving unit 22R for driving red light emitting element 3R, and blue system for driving blue light emitting element 3B Drive signal conversion for converting the control signals input to the LED drive unit 22B and the control signal input unit 20 into drive signals to be supplied to the green LED drive unit 22G, the red LED drive unit 22R, and the blue LED drive unit 22B Part 23.

  The three drive units 22G, 22R, and 22B all have a common configuration. As shown in FIG. 1C, the output terminal on the high potential side of the AC / DC conversion unit 21, the anode of the light emitting element 3, and A current limiting resistor R inserted between the source and the cathode of the light emitting element 3 and a field effect transistor having a drain connected to the output terminal (ground) on the low potential side of the AC / DC converter 21. And a waveform shaping circuit that shapes the drive signal output from the drive signal conversion unit 23. This waveform shaping circuit is well known in the art, and includes a PNP bipolar transistor Tr1 having a collector connected to the output terminal on the high potential side of the AC / DC converter 21 and an emitter connected to the gate of the switching element Q1. The NPN type bipolar transistor Tr2 has a collector connected to the gate of the switching element Q1 and an emitter connected to the ground. The drive signal input to the bases of the two transistors Tr1 and Tr2 connected in parallel is waveform-shaped. Output to the gate of the switching element Q1. Here, the drive signal conversion unit 23 outputs a drive signal composed of a rectangular wave signal having a constant cycle with a variable on-duty ratio, whereby the switching element Q1 of the drive units 22G, 22R, and 22B is PWM (pulse width modulation). The amount of power supplied to the light emitting elements 3G, 3R, 3B is adjusted by controlling.

  The controller 1 has a housing 10 made of a box-shaped synthetic resin molded product, and a cylindrical operation section 11 and a power switch operation button 12 are disposed on the front surface of the housing 10 (see FIG. 1A). . The power switch (not shown) includes a tumbler switch and a push button switch, and opens and closes a power feeding path from the AC power supply AC to the power supply unit 2. Inside the housing 10 are a variable resistor (not shown) whose resistance value is changed by operating the operation unit 11, an A / D converter (not shown) for A / D converting the resistance value of the variable resistor, A / A control signal generation unit (not shown) that generates a control signal based on the resistance value converted into a digital value by the D converter is housed.

  The operation unit 11 is provided so as to be rotatable within a range of about 315 degrees (7 / 4π) with respect to the housing 10, and when the mark 11 a formed on the front surface is at the 6 o'clock position, The resistance value becomes the minimum value, and the resistance value of the variable resistor becomes the maximum value when the mark 11a is at an intermediate position between the 4 o'clock position and the 5 o'clock position (position at 4:30). Then, when the operation unit 11 rotates clockwise and counterclockwise between the 6 o'clock position and the 4:30 position, the resistance value of the variable resistor changes linearly, based on the resistance value. Thus, the operation amount of the operation unit 11 (the position of the mark 11a) can be known.

  The control signal generation unit generates a control signal (PWM signal) having an on-duty ratio that has a one-to-one correspondence with a value from the minimum value to the maximum value of the resistance value of the variable resistor, and outputs the control signal to the power supply unit 2. Here, the operation amount of the operation unit 11, that is, the on-duty ratio of the control signal corresponds to the light color (color temperature) of the illumination light of the illumination light source 3. It does not match the perceived change in light color. That is, even when the amount of change in color temperature at a relatively low color temperature (for example, 2800K) is equal to the amount of change in color temperature at a relatively high color temperature (for example, 4500K) (for example, 100K). The former color temperature change is easily recognized, but the latter color temperature change is difficult to recognize. Therefore, if the operation amount of the operation unit 11 and the change amount of the color temperature are simply correlated, a sense of incongruity occurs between the actually recognized change in the color temperature and the usability is deteriorated.

Here, if the difference of the reciprocal color temperature (unit: MK ⁻¹ <per megakelvin> or mired) is equal to the change of the color temperature, the reciprocal of the color temperature is a million (10 ⁶ ) times. It is known that humans feel that the change in light color is almost the same. Therefore, in this embodiment, as indicated by a straight line A in FIG. 2B, the difference between the change amount of the operation input (the difference in the operation amount of the operation unit 11) and the difference between the reciprocal color temperature (the on-duty ratio of the control signal) are obtained. The correspondence between the operation amount (angle [deg]) of the operation unit 11 and the reciprocal color temperature is set so as to change while maintaining a proportional relationship. Specifically, as shown in FIG. 2A, when the operation amount of the operation unit 11 is changed by a constant difference (about 36 [deg]), the difference of the reciprocal color temperature is a substantially constant value (about 50). The reciprocal color temperature corresponding to each operation amount (resistance value) is set to be ± 3).

In the power supply unit 2, the control signal output from the control signal generation unit of the controller 1 is converted into a DC voltage signal having a voltage level corresponding to the on-duty ratio (reciprocal color temperature) by the control signal input unit 20. The DC voltage signal is converted by the drive signal conversion unit 23 into drive signals for the LED drive units 22G, 22R, and 22B of the respective colors. The drive signal conversion unit 23 includes a microcomputer and a memory, and the signal level (reciprocal color temperature) of the DC voltage signal, the color temperature calculated backward from the reciprocal color temperature, and the color of the illumination light corresponding to the color temperature. The degree coordinates (x ₀ , y ₀ ), the ratio of the light amounts Y _R , Y _G , Y _B of the light emitting elements 3R, 3G, 3B corresponding to the chromaticity coordinates, and the light amount Y of the light emitting elements 3R, 3G, 3B A conversion table representing the correspondence relationship between _{R 1} , Y _G , and Y _B is stored in the memory, and a DC voltage signal is converted into a drive signal by a microcomputer based on the conversion table.

By the way, although it is possible to adjust the light color and the light amount of the illumination light independently of each other, as described in the prior art, the psychological effect differs depending on the illuminance (light amount) even at the same color temperature. Even if a person tries to obtain a desired psychological effect (Krusov effect), it is very difficult to appropriately adjust the light color (color temperature) and the illuminance (light amount). On the other hand, considering the Krusov effect, in order to realize a comfortable lighting environment from the viewpoint of psychological effect, it is desirable to have a characteristic that the light quantity increases as the color temperature of the light color increases, especially the low color temperature In this region (region of about 2800 K or less which is the light color of the incandescent lamp), it is preferable to simulate the characteristics of illuminance (light amount) and light color (color temperature) obtained when the incandescent lamp is dimmed. In medium and high color temperature regions, the amount of light may be increased as the color temperature is increased. However, in general lighting applications, it is sufficient if a light amount of the rated level is obtained. Is not preferable from the viewpoint of energy saving. Therefore, it is desirable to make the light quantity constant in an area of a predetermined color temperature (for example, 2800 K) or more. Further, in the high color temperature region, the ratio of the light amount Y _B of the blue light emitting element 3B among the three color light emitting elements 3R, 3G, 3B is high, but the light emission efficiency of the blue light emitting element 3B is other than that. Therefore, it may be difficult to increase the light color (color temperature) while keeping the amount of illumination light Y ₀ constant. Therefore, it is preferable to reduce the amount of light as the color temperature increases in an area of a predetermined color temperature (for example, 2800 K) or higher.

From the above viewpoint, in the present embodiment, the color temperature of the illumination light corresponds to the operation amount of the operation unit 11 in a range less than a predetermined color temperature (about 2800 K in the present embodiment) as indicated by a curve B in FIG. In addition, the amount of light increases or decreases in a linked manner, and within a color temperature range of 2800K or higher, the amount of light is within a predetermined range (Z% to Y% when the rated light amount is 100%. However, Y is about 110% to 120%. , Z is about 80% to 90%.) The amount of light Y _R of each light emitting element 3R, 3G, 3B is adjusted so that the color temperature of the illumination light increases or decreases in accordance with the operation amount of the operation unit 11 while being within the range. Y _G and Y _B are determined. In FIG. 3, the values (positions) of characteristic curves B corresponding to the respective operation amounts when the operation amount of the operation unit 11 is divided by 45 degrees (1 / 4π) are indicated by arrows. However, the characteristic curve B shown in FIG. 3 is an example, and the color temperature-light quantity characteristic is set within a triangular area surrounded by a dotted line C in a color temperature range below a predetermined color temperature (for example, 2800 K). Similarly, the color temperature-light quantity characteristic may be set within a rectangular area surrounded by a dotted line D in a range of a predetermined color temperature or higher. Further, the lower limit value and the upper limit value of the color temperature are not limited to the values shown in FIG. 3 (about 1500K and 10,000K).

Thus, when the operation unit 11 of the controller 1 is operated from the 6 o'clock position to the 10:30 position, the color temperature of the illumination light according to the operation amount of the operation unit 11 (the position of the mark 11a). Increases / decreases in the range from the minimum value (about 1500 K) to a predetermined color temperature (2800 K), and the higher the color temperature, the larger the amount of illumination light Y ₀ , and the operation unit 11 moves from the 10:30 position to 4:30. When the operation is performed until the position, the color temperature of the illumination light increases or decreases in a range from the predetermined color temperature (2800K) to the maximum value (10000K) according to the operation amount of the operation unit 11, and the higher the color temperature, the more illumination is performed. The drive signal conversion unit 23 converts the control signal into a drive signal so that the amount of light Y ₀ becomes small.

  As described above, according to the present embodiment, the control signal input unit 20 of the power supply unit 2 according to the operation input received by the operation input receiving means (the operation unit 11 of the controller 1, the variable resistor, the A / D converter). In the range below the predetermined color temperature, the drive signal conversion unit 23 corresponds to the change in the operation input (the operation amount of the operation unit 11) so that the color temperature and the light amount of the illumination light increase or decrease in conjunction with each other. The light amount of each of the light emitting elements 3R, 3G, 3B is determined so that the color temperature of the illumination light increases or decreases in accordance with the change of the operation input while keeping the light amount within the predetermined range in the range above the predetermined color temperature. Since the light quantity of each light emitting element 3R, 3G, 3B of the illumination light source 3 is determined, the light color (color temperature) and illuminance of illumination light (color temperature) and illuminance (as compared to the conventional example in which a person adjusts the light quantity for each color individually) Light quantity) can be easily adjusted. Here, in the range where the color temperature of the illumination light is equal to or higher than the predetermined color temperature (2800 K), there is a proportional relationship between the difference of the operation amount of the operation unit 11 and the difference of the reciprocal color temperature (control signal on-duty ratio). Since the operation amount of the operation unit 11 and the color temperature are associated with each other so as to maintain the same, there is no sense of incongruity between the difference in the operation amount of the operation unit 11 and the color temperature change that is actually recognized. There is also an advantage of improvement.

  When the on-duty ratio of the control signal is made to correspond to the color temperature instead of the reciprocal color temperature, the on-duty of the control signal with respect to the operation amount of the operation unit 11 as shown by a curve i ′ in FIG. The control signal generator of the controller 1 may generate the control signal based on the correspondence relationship in which the ratio (color temperature) changes approximately exponentially.

  FIG. 4 is a block diagram showing another configuration of the power supply unit 2. In this configuration, the function of the drive signal conversion unit 23 that converts the DC voltage signal output from the control signal input unit 20 into a drive signal for the LED drive units 22G, 22R, and 22B of each color system is the LED drive unit 22G, 22R. , 22B, and the drive signal converter 23 is omitted.

(Embodiment 2)
The illumination device of the present embodiment is characterized in that the power supply unit 2 is built in the housing 10 of the controller 1 in the first embodiment as shown in FIG. 5, and the basic configuration is the same as that of the first embodiment. Therefore, the same code | symbol is attached | subjected to the same component as Embodiment 1, and description is abbreviate | omitted.

  In the present embodiment, a variable resistor (not shown) whose resistance value is changed by operation of the operation unit 11, an A / D converter (not shown) for A / D converting the resistance value of the variable resistor, A A controller input unit 24 that generates a DC voltage signal corresponding to the reciprocal color temperature (or color temperature) based on the resistance value converted into a digital value by the / D converter is provided in the housing 10 instead of the control signal input unit 20. It is stored. However, the DC voltage signal output from the controller input unit 24 is common to the DC voltage signal output from the control signal input unit 20 in the first embodiment. FIG. 5B illustrates the power switch SW that is not illustrated in the first embodiment.

  Thus, in the first embodiment, it is necessary to install the controller 1 and the power supply unit 2 separately and connect them with a power supply wire and a control signal transmission wire. There is an advantage that the wiring can be omitted.

  FIG. 6 is a block diagram showing another configuration of the controller 1. In this configuration, the function of the drive signal conversion unit 23 that converts the DC voltage signal output from the controller input unit 24 into a drive signal for the LED drive units 22G, 22R, and 22B of each color system is the LED drive unit 22G, 22R, The drive signal conversion unit 23 is omitted.

1 Controller 2 Power supply unit (lighting device)
3 Illumination light source 3R Red light emitting element 3G Green light emitting element 3B Blue light emitting element 11 Operation unit 20 Control signal input unit 22G Green LED driving unit 22R Red LED driving unit 22B Blue LED driving unit 23 Drive signal Conversion unit

Claims (4)

A lighting device that lights a plurality of light emitting elements that emit light of different colors and controls the color temperature and light amount of the combined light,
A control signal instructing color temperature and light quantity is input from the outside, and a control signal input unit that outputs a DC voltage corresponding to the control signal and converts the DC voltage into a drive signal for driving a plurality of light emitting elements. A drive signal conversion unit, and a plurality of light emitting element driving units for driving each light emitting element according to the drive signal,
When the relationship between the color temperature of the synthesized light and the amount of light is less than the predetermined color temperature, the color temperature and the amount of light increase or decrease in association with each other so that the amount of light increases as the color temperature increases, and the relationship between the color temperature of the synthesized light and the amount of light In the range where the color temperature is equal to or higher than the predetermined color temperature, the control signal input unit and the drive signal conversion unit determine the relationship between the color temperature and the light amount so that the light amount falls within the predetermined range with respect to the increase or decrease of the color temperature. A lighting device.   The control signal input unit and the drive signal conversion unit increase or decrease in conjunction with each other so as to be convex downward when the color temperature is on the horizontal axis and the light quantity is on the vertical axis in a range below a predetermined color temperature. The lighting device according to claim 1.   The lighting device according to claim 1, a plurality of light emitting elements that emit light of different colors and that are lit by the lighting device, and an operation input by a person, and the control signal that indicates the color temperature and the light amount An illumination device comprising operation input receiving means for outputting.   4. The lighting device according to claim 3, wherein in a range equal to or higher than the predetermined color temperature, a change in the operation amount of the operation input received by the operation input receiving unit and a difference between the reciprocal color temperatures of the synthesized light are in a proportional relationship.

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