JP2012181942A - Led lighting device - Google Patents

Abstract

An LED lighting device having high color rendering properties that suppresses color unevenness and reproduces the color of an object itself is provided.
SOLUTION: First, second, and third white LEDs 12a, b, and c, a red LED 9, a green LED 10, and a blue LED 11 are provided. The first white LED 12a and the red LED 9 are connected in series, the current is controlled by the variable resistor 2, the second white LED 12b and the green LED 10 are connected in series, the current is controlled by the variable resistor 3, and the first The white LED 12 c and the blue LED 11 are connected in series, and the current is controlled by the variable resistor 4. By combining the red LED 9, the green LED 10, and the blue LED 11, the color is white.
[Selection] Figure 1

Description

  The present invention relates to an LED illumination device that is used indoors or in a store and emits light by emitting a white LED (Light Emitting Diode), and more particularly, to an LED illumination device with better color rendering.

  In recent years, lighting devices using LEDs instead of fluorescent lamps have been used in order to save energy and cope with the environment. Various LED lighting devices using a plurality of white LEDs have been developed as LED lighting devices for general lighting used indoors or in stores. For example, there is an LED lighting device as described in Patent Document 1 . The LED illumination device described in Patent Literature 1 focuses on the difference in the luminance values of adjacent light sources in order to suppress color unevenness with respect to light emission of white LEDs.

JP 2010-80145 A (paragraphs 0018-0022, FIG. 1)

  For lighting equipment for various commercial facilities that handle cosmetics and perishables, and for exhibition facilities such as museums, it is not only necessary to suppress appropriate brightness, color unevenness, and brightness unevenness, but also to target objects as illumination light. In order to illuminate, it is necessary to have high so-called color rendering properties that reproduce the color of the object itself. If the color rendering property is low, the color looks different from the real color when the object is illuminated. For example, lighting devices are required to have high color rendering properties so that the color of an object can be clearly seen, such as skin color for humans and red for apples.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide an LED lighting device with better color rendering.

In order to solve the above problems, the LED lighting device of the present invention is
First and second white LEDs emitting white light;
An LED illumination device comprising first and second color LEDs that emit colors other than white,
First control means for controlling currents of the first white LED and the first color LED;
It is characterized by comprising second control means for controlling currents of the second white LED and the second color LED.
According to this feature, the current of the first white LED and the first color LED can be controlled together by the first control means, and the second white LED can be controlled by the second control means. And the current of the second color LED can be controlled together. Thereby, since each electric current of 1st, 2nd color LED can be adjusted with the 1st, 2nd control means, the brightness | luminance of 1st, 2nd color LED can each be adjusted, and a target object You can adjust the color of the to make it appear more clearly. For example, when the object is a red apple, the first color LED can be red, and the first control means and the second control means can be adjusted so that the red color can be seen more clearly. As a result, it is possible to irradiate a brilliant color corresponding to the object, and to further improve the color rendering. Since the white LED and the color LED are used to adjust the current, the luminance can be ensured compared to controlling the current of only the color LED, and the hue can be changed without reducing the brightness. The current consumption can be reduced by flowing the same current. In addition, since the brightness adjustment of the first white LED and the first color LED and the brightness adjustment of the second white LED and the second color LED can be respectively performed, occurrence of color unevenness can be suppressed. it can. Furthermore, for example, by causing a current of the same magnitude to flow through the first white LED and the first color LED, it is possible to suppress the occurrence of luminance unevenness, which is the same as the second white LED and the second color LED. The occurrence of uneven brightness can be suppressed by flowing a current having a magnitude of.

The LED lighting device of the present invention is
The first color LED and the second color LED respectively emit different colors.
According to this feature, for example, the first and second color LEDs are respectively determined as different colors according to the color of the object to be illuminated, and the first and second control means control the first and second colors, respectively. Since the current of each of the two color LEDs can be adjusted, the luminance of the first and second color LEDs can be adjusted, respectively, and the color of the object can be adjusted so as to appear more clearly. As a result, it is possible to irradiate a brilliant color corresponding to the object, and to further improve the color rendering.

The LED lighting device of the present invention is
The first color LED and the second color LED are combined to become white.
According to this feature, the first color LED and the second color LED are, for example, colors that are complementary to each other (such as red and light blue), and are combined so that the color is white. it can. Thereby, white color adjustment can be performed. Thus, in addition to the first and second white LEDs, the first and second color LEDs are configured to be white, so that the bandwidth is higher than when only the first and second white LEDs are provided. And a high-quality lighting device with excellent color rendering.

The LED lighting device of the present invention is
A first circuit in which the first white LED and the first color LED are connected in series;
A second circuit in which the second white LED and the second color LED are connected in series;
The first circuit and the second circuit are connected in parallel.
According to this feature, the first white LED and the first color LED are connected in series to form a first circuit, and the second white LED and the second color LED are connected in series to form a second circuit. Thus, each of the first and second control means can easily perform current control of these circuits. Further, by connecting the first circuit and the second circuit in parallel, they can be connected to the same voltage source. In addition, by connecting the circuits in parallel, even if the circuit is disconnected in one circuit, the voltage is supplied without affecting the other circuits, so that the LEDs of the other circuits continue to emit light. be able to.

The LED lighting device of the present invention is
Comprising a plurality of the first circuits, connecting the plurality of first circuits in series;
A plurality of the second circuits are provided, and the plurality of second circuits are connected in series.
According to this feature, a larger illumination device can be configured by providing a plurality of first and second circuits. Since the plurality of first circuits are connected in series, the first control means can easily perform current control of these circuits, and the plurality of second circuits are connected in series. The control means can easily control the current of these circuits.

The LED lighting device of the present invention is
A first module for mounting the first white LED and the second white LED;
A second module for mounting the first color LED and the second color LED is provided.
According to this feature, the first module can be mounted with the first and second white LEDs, and the second module can be mounted with the first and second color LEDs. Therefore, for example, a package on which an existing LED is mounted can be used as it is as each module. For example, a package including at least two white LEDs can be used as the first module, and a package including at least red LEDs and green LEDs can be used as the second module.

The LED lighting device of the present invention is
A plurality of the first and second modules are provided, and the first module and the second module are alternately arranged.
According to this feature, by providing a plurality of first and second modules, a larger lighting device can be easily configured. In addition, by arranging the first module and the second module alternately, it is possible to further suppress the occurrence of uneven brightness and uneven color. For example, by making the first module and the second module LED modules that generate different white colors, it is possible to provide a high-quality lighting device with a wider bandwidth and excellent color rendering than when a plurality of identical modules are provided. can do.

The LED lighting device of the present invention is
A third white LED that emits white light;
A third color LED that emits a color other than white;
It is further characterized by further comprising third control means for controlling currents of the third white LED and the third color LED.
According to this feature, the current of the third white LED and the third color LED can be controlled together by the third control means. For example, the third white LED and the third color LED can be controlled. By causing the same current to flow through, the occurrence of uneven brightness and uneven color can be suppressed.

The LED lighting device of the present invention is
The first color LED, the second color LED, and the third color LED emit light of different colors, respectively, and the first color LED, the second color LED, and the third color LED. It is characterized by being white when combined.
According to this feature, white color adjustment can be performed by using, for example, LEDs of three primary colors of red, green, and blue (RGB) as the first to third color LEDs. By providing the three primary colors of red, green, and blue, appropriate color adjustment can be performed regardless of the color of the object. In addition, a third circuit in which the third white LED and the third color LED are connected in series is provided, and the first circuit, the second circuit, and the third circuit are connected in parallel. Also good. And a plurality of third circuits in which the third white LED and the third color LED are connected in series, the plurality of third circuits being connected in series, and the first circuit and the second circuit. And the third circuit may be connected in parallel. Further, as the second module, in addition to the first color LED and the second color LED, a third color LED may be provided. As the third color LED, for example, It may be a blue LED.

It is a minimum circuit block diagram of the LED lighting apparatus in an Example. It is a figure which shows the other example of the minimum circuit block diagram of the LED lighting apparatus in an Example. It is a circuit block diagram at the time of providing the circuit of the LED lighting apparatus in an Example in multiple numbers. It is a chromaticity diagram in the LED illuminating device in an Example. It is a circuit block diagram at the time of providing many circuits of the LED lighting apparatus in an Example. It is explanatory drawing which shows the example of a connection in the circuit structure in an Example. It is explanatory drawing which shows the other example of a connection by the circuit structure in an Example. It is a module arrangement | positioning figure of the LED lighting apparatus in an Example.

  EMBODIMENT OF THE INVENTION The form for implementing the LED lighting apparatus in the Example which concerns on this invention is demonstrated below based on an Example.

  The LED lighting device in the Example of this invention is demonstrated with reference to FIGS. The LED lighting device according to the embodiment of the present invention is used for lighting devices for various commercial facilities that handle cosmetics and fresh food, for exhibition facilities such as museums, and for restaurant facilities that handle food and drink. In particular, color rendering can be controlled to be higher so that the color of the object can be clearly seen.

  In FIG. 1, the minimum circuit block diagram of the LED illuminating device in an Example is shown. In FIG. 1, the LED illumination device includes white LEDs 12 a, 12 b, and 12 c that are first, second, and third white LEDs that emit white light, and first, second, and third colors that emit different colors. A first circuit 6 in which a red LED 9, a green LED 10 and a blue LED 11, which are LEDs, a first white LED 12 a and a red LED 9 are connected in series, and a second white LED 12 b and a green LED 10 are connected in series. Two resistors 7, a third circuit 8 in which a third white LED 12c and a blue LED 11 are connected in series, and a variable resistor which is a first control means for controlling the currents of the first white LED 12a and the red LED 9 2, the variable resistor 3 which is a second control means for controlling the currents of the second white LED 12 b and the green LED 10, the currents of the third white LED 12 c and the blue LED 11. Gosuru and a variable resistor 4 is a third control means.

  In the present embodiment, the white LED 12a, 12b, 12c that emits white light with one LED element is illuminated white and the current of the white LED and the color LED is controlled by each variable resistor. The color can be adjusted to make it appear more clearly.

  As the white LEDs 12a, 12b, and 12c, any LED that emits white light may be used. For example, an LED that emits white light by a structure in which a blue light emitting diode chip is covered with a phosphor such as yellow, or a purple light emitting diode. An LED that emits white light using a phosphor can be used. Here, although the case where one light emitting diode is used is shown as the white LED, it may be made white by using light emitting diodes of a plurality of colors. As the white LEDs 12a, 12b, and 12c, for example, a package in which three existing white LEDs are surface-mounted together on a substrate can be used as it is to form the first module 30. The white LEDs 12a, 12b, and 12c may be arranged on a polygonal or circular base material.

  The red LED 9, the green LED 10, and the blue LED 11 may be anything that emits a color other than white, but by setting the three primary colors red, green, and blue, the color of the object can be changed to that color. Can be matched. In addition, by combining the red LED 9, the green LED 10, and the blue LED 11 in close proximity with the three primary colors, white light can be emitted as a whole. For example, the red LED 9, the green LED 10, and the blue LED 11 can be used as the second module 31 by directly using a package in which existing RGB LEDs are surface-mounted together on a substrate. The red LED 9, the green LED 10, and the blue LED 11c may be arranged on a polygonal or circular base material. If it arrange | positions so that the irradiation direction of each element of red LED9, green LED10, and blue LED11c may converge, the lighting dot of each element can be made not conspicuous. In the present embodiment, the case where three different colors are used as the color LED is shown. However, two color LEDs are provided, and the color LED is set to a color LED that matches the object. You may make it adjust so that it may appear clearly. In this case, the two color LEDs may be the same color or different colors. In the case of different colors, colors that are complementary to each other (red and light blue, etc.) can be combined to produce white.

  In the first circuit 6, the first white LED 12 a and the red LED 9 are connected in series, and the variable resistor 2 that is the first control means is connected to the first circuit 6. By adjusting the variable resistor 2, the currents flowing through the first white LED 12a and the red LED 9 can be adjusted simultaneously, and the luminance of the first white LED 12a and the red LED 9 is adjusted according to the adjusted amount of current. Since the brightness of the first white LED 12a and the red LED 9 is adjusted at the same time, not only red but also white brightness can be adjusted, so that uneven color can be prevented. For example, when the luminance of red is increased, the luminance of the first white LED 12a is increased accordingly. Since the first white LED 12a and the red LED 9 are connected in series, the amount of current is the same, and since no extra current flows, power consumption can be reduced. Further, the first white LED 12a and the red LED 9 can be adjusted more easily than the current adjustment separately.

  In the second circuit 7, the second white LED 12 b and the green LED 10 are connected in series, and the variable resistor 3 serving as the second control unit is connected to the second circuit 7. By adjusting the variable resistor 3, the current flowing through the second white LED 12b and the green LED 10 can be adjusted at the same time. By adjusting the brightness of the second white LED 12b and the green LED 10 at the same time, not only the green brightness but also the white brightness can be adjusted. Since it can also be adjusted, color unevenness can be prevented. For example, when the green luminance is reduced, the luminance of the second white LED 12b is also reduced accordingly. Since the second white LED 12b and the green LED 10 are connected in series, the amount of current is the same, and since no extra current flows, power consumption can be reduced. Further, the second white LED 12b and the green LED 10 can be adjusted more easily than the current adjustment separately.

In the third circuit 8, the third white LED 12 c and the blue LED 11 are connected in series, and the variable resistor 4 serving as the third control unit is connected to the third circuit 8. By adjusting the variable resistor 4, the current flowing through the third white LED 12 c and the blue LED 11 can be adjusted at the same time, and by adjusting the luminance of the third white LED 12 c and the blue LED 11 at the same time, not only blue but also white luminance can be adjusted. Since it can also be adjusted, color unevenness can be prevented. For example, when the blue brightness is reduced, the brightness of the third white LED 12c is also reduced accordingly. Since the third white LED 12c and the blue LED 11 are connected in series, the amount of current is the same, and since no extra current flows, power consumption can be reduced. Further, the third white LED 12c and the blue LED 11 can be adjusted more easily than the current adjustment separately.
The first circuit 6, the second circuit 7, and the third circuit 8 are connected in parallel, and the power input via the power input terminals 1 and 1 is supplied to the respective circuits, so that each LED is Light. By connecting each circuit in parallel, even if it is disconnected in one circuit, voltage is supplied without affecting other circuits, so each LED in other circuits can continue to emit light. it can.

  The variable resistor 2, the variable resistor 3, and the variable resistor 4 can constitute a current variable control circuit 5. As the current variable control circuit 5, for example, a circuit including three existing variable resistors can be used.

  In the LED lighting device according to the present embodiment, power is supplied through the power input terminals 1 and 1, each LED is turned on, and the variable resistor 2, the variable resistor 3, and the variable resistor 4 are adjusted, respectively. The brightness | luminance of white LED12a, 12b, 12c, red LED9, green LED10, and blue LED11 is adjusted. Specifically, the variable resistor 2, the variable resistor 3, and the variable resistor 4 can be adjusted so that the object is irradiated and the color of the object becomes clearer. For example, in the case of a red object, the variable resistor 2 is adjusted so that the luminance of the red LED 9 is higher than the luminance of the other green LEDs 10 and the blue LEDs 11 by increasing the current flowing through the red LED 9. The red color can be seen more clearly. As a result, it is possible to irradiate a brilliant color corresponding to the object, and to further improve the color rendering. By providing the three primary colors of red, green, and blue, appropriate color adjustment can be performed regardless of the color of the object.

  Next, with reference to FIG. 2, another example of the minimum circuit configuration diagram of the LED lighting device in the embodiment will be described. In FIG. 2, a current limiting diode 13 is added to each of the first circuit 6, the second circuit 7, and the third circuit 8 in the minimum circuit configuration shown in FIG. 1. Since the current limit diode 13 restricts the flow of a current of a predetermined value or more, it is possible to prevent an overcurrent from flowing through each LED and prevent the LED from being damaged.

  Next, with reference to FIG. 3, an example of a circuit configuration in the case where a plurality of circuits of the LED lighting device in the embodiment are provided will be described. 3, a load for connecting a plurality of first circuits 6, a second circuit 7, and a third circuit 8 in the minimum circuit configuration shown in FIG. 1 in series, and lighting a plurality of LEDs. In order to cope with the increase in the voltage, a transistor 15 and a resistor 14 are provided in each circuit so that a large current can flow. The base current of the transistor 15 is controlled by the variable resistor 2, the variable resistor 3, and the variable resistor 4, respectively. By connecting a plurality of first circuits 6 in series and controlling the current by the variable resistor 2, the plurality of first white LEDs 12a and the plurality of red LEDs 9 can be controlled simultaneously, and the same current flows. Therefore, uneven brightness can be prevented. A plurality of second white LEDs 12b and a plurality of green LEDs 10 can be controlled simultaneously by connecting a plurality of second circuits 7 in series and controlling the current by the variable resistor 3, and the same current flows. Therefore, uneven brightness can be prevented. Similarly, a plurality of third white LEDs 12c and a plurality of blue LEDs 11 can be controlled at the same time by connecting a plurality of third circuits 8 in series and controlling the current by the variable resistor 4. Since current can flow, uneven brightness can be prevented. By using the transistor 15, it is possible to pass a current necessary for lighting the LEDs of each circuit. Thus, a larger lighting device can be configured by providing a plurality of circuits.

  In this case, the current of the base of the transistor 15 may be controlled from the outside. A connection example in this case will be described with reference to FIG. FIG. 6 shows a connection example in the circuit configuration shown in FIG. In FIG. 6, the external controller 18 which can control the illuminating device 19 of a structure as shown in FIG. 3 from the outside is provided. Further, a base current controller 17 is provided so that the resistance values of the variable resistor 2, the variable resistor 3, and the variable resistor 4 can be instructed from the outside. Each of the base current controllers 17 has a built-in variable resistor so that the amount of current can be controlled by an instruction from the external controller 18. With this configuration, the base current of the transistor 15 of the lighting device 19 can be externally controlled by the external controller 18.

  Further, another example of connection in the case where the base current of the transistor 15 is controlled from the outside will be described with reference to FIG. FIG. 7 shows a connection example in the case where the circuit configuration shown in FIG. 3 is further configured so that the hue can be controlled. 7 includes a hue controller 21 that can control the illumination device 19 having the configuration shown in FIG. 3 from the outside and a hue setting unit 22 that sets a hue in advance. The variable resistor 2, the variable resistor 3, and the variable A base current controller 17 is provided so that the resistance value of the resistor 4 can be instructed from the outside. Moreover, the current detector 20 which detects the magnitude | size of the electric current which flows into each circuit is each provided. The magnitude of the current detected by the current detector 20 is input to the hue controller 21, and the hue controller 21 further adjusts the magnitude of the current flowing through each circuit based on the magnitude of the input current. Can do. The hue setting unit 22 sets a hue emitted from the entire lighting device 19 and sets a hue of light obtained by synthesizing lights emitted from the white LEDs 12a, 12b, and 12c, the red LED 9, the green LED 10, and the blue LED 11, respectively. it can. For example, by setting the hue to be synthesized and determining the chromaticity of the LED of each circuit corresponding to the hue, the amount of current flowing through the LED can be set. In this case, it can be set by displaying a hue sample on a display provided in the hue setting unit 22 and instructing the hue to be synthesized from the hue sample. Further, for example, by setting the increase / decrease of the chromaticity of a specific color by the hue setting unit 22, the remaining colors may be set so as to be specified in conjunction with the chromaticity of the set color. . FIG. 4 shows an xy chromaticity diagram. In FIG. 4, a substantially central point (white) corresponds to a white portion, and RW (red LED 9-first white LED 12a), GW (green LED 10-second white LED 12b), B-W ( It shows that the color emitted from the entire LED lighting device is determined by the combination of the respective vectors of the blue LED 11 and the third white LED 12c). Also, the luminance is determined from the chromaticity of each color, and the current amounts of the first circuit 6, the second circuit 7, and the third circuit 8 are set from the luminance determined according to the chromaticity. For example, when the hue setting unit 22 is set to emphasize red, the hue controller 21 instructs the base current controller 17 to increase the current of the first circuit 6, and the base current controller 17 Accordingly, the current of the first circuit 6 is increased. The current detector 20 detects the current flowing through the first circuit 6 and feeds it back to the hue controller 21. The hue controller 21 can control the current flowing in the second circuit 7 and the third circuit 8 to be reduced uniformly according to the amount of the increase. With this configuration, the base current of the transistor 15 of the lighting device 19 can be controlled from the outside by the hue controller 21 and the hue setting unit 22 according to the hue.

  Further, a large number of each of the first circuit 6, the second circuit 7, and the third circuit 8 may be provided as shown in FIG. In this case, as shown in FIG. 8, the first modules 30 and the second modules 31 can be arranged alternately. FIG. 8 shows a module layout of the LED lighting device, and shows an external appearance when each module is actually arranged on the substrate. As shown in FIG. 8, when a package on which an existing LED is mounted is used as each module as it is, a package in which three existing white LEDs are surface-mounted together on the substrate is used as the first module 30. A package in which the existing RGB LEDs are surface-mounted together on the substrate is used as the second module 31, and the first module 30 and the second module 31 are alternately arranged on the substrate, and the terminals of each module are arranged. It can be configured by connecting each. The LED lighting device 19 in the present embodiment can suppress the occurrence of luminance unevenness and color unevenness by arranging the first modules 30 and the second modules 31 alternately.

  As described above, in the LED illumination device according to the present embodiment, at least the white LEDs 12a and 12b that emit white, the red LED 9 and the green LED 10 that emit colors other than white, and the currents of the white LED 12a and the red LED 9 are controlled. Since the variable resistor 2 and the variable resistor 3 for controlling the current of the white LED 12b and the green LED 10 are provided, the current of the white LED 12a and the red LED 9 can be controlled together by the variable resistor 2. Moreover, the current of the white LED 12b and the green LED 10 can be controlled together by the variable resistor 3. Thereby, since brightness adjustment of white LED12a and red LED9 and brightness adjustment of white LED12b and green LED10 can be performed, respectively, generation | occurrence | production of color irregularity can be suppressed. For example, the occurrence of uneven brightness can be suppressed by flowing the same current through the white LED 12a and the red LED 9, and the occurrence of uneven brightness can be suppressed by flowing the same current through the white LED 12b and the green LED 10. Since the white LED and the color LED are used to adjust the current, the luminance can be ensured compared to controlling the current of only the color LED, and the hue can be changed without reducing the brightness. The current consumption can be reduced by flowing the same current. Moreover, since the current of each of the red LED 9 and the green LED 10 can be adjusted by the variable resistor 2 and the variable resistor 3, the luminance of the red LED 9 and the green LED 10 can be adjusted respectively, and the color of the object can be more clearly defined. Can be adjusted to show. For example, when the object is a red apple, the variable resistor 2 and the variable resistor 3 can be adjusted so that the luminance of the red LED 9 is increased and the red color is seen more clearly. As a result, it is possible to irradiate a brilliant color corresponding to the object, and to further improve the color rendering.

  In the LED lighting device according to the present embodiment, different colors are emitted, such as the red LED 9 and the green LED 10, so that the current of the red LED 9 and the green LED 10 is changed by the variable resistor 2 and the variable resistor 3. Since it can adjust, the brightness | luminance of red LED9 and green LED10 can each be adjusted, and it can adjust so that the color of a target object may appear more clearly. For example, the red LED 9 and the green LED 10 may use other colors other than these in accordance with the color of the object to be illuminated.

  In the LED illumination device according to the present embodiment, the white color is adjusted by combining the red LED 9, the green LED 10, and the blue LED 11, so that the white color adjustment can be performed, but two colors that are complementary to each other. Only the LEDs may be used. For example, it can be made white by combining a red LED 9 and a light blue LED which are in a complementary color relationship. Moreover, you may make it become white by combining blue LED11 and yellow LED which are complementary color relations. Thereby, white color adjustment can be performed. In this way, in addition to the white LED 12a and the white LED 12b, if the red LED 9 and the light blue LED, or the blue LED 11 and the yellow LED are configured to be white, the bandwidth is higher than the case where only the white LED 12a and the white LED 12b are provided. A wide, high-quality lighting device with excellent color rendering can be obtained.

  The LED lighting device in this embodiment includes a first circuit 6 in which a white LED 12a and a red LED 9 are connected in series, and a second circuit 7 in which a white LED 12b and a green LED 10 are connected in series, Since the first circuit 6 and the second circuit 7 are connected in parallel, each of the variable resistor 2 and the variable resistor 3 can easily perform current control of these circuits. Further, by connecting the first circuit 6 and the second circuit 7 in parallel, they can be connected to the same voltage source. In addition, by connecting the circuits in parallel, even if the circuit is disconnected in one circuit, the voltage is supplied without affecting the other circuits, so that the LEDs of the other circuits continue to emit light. be able to.

  In the LED lighting device according to the present embodiment, a plurality of first circuits 6 are provided, the plurality of first circuits 6 are connected in series, a plurality of second circuits 7 are provided, and the plurality of second circuits 7 are connected in series. Therefore, a larger lighting device can be configured. Since the plurality of first circuits 6 are connected in series, the variable resistor 2 can easily control the current of these circuits, and the plurality of second circuits 7 are connected in series. The device 3 can easily control the current of these circuits.

  In the LED lighting device according to the present embodiment, the first module 30 for mounting the white LED 12a and the white LED 12b and the second module 31 for mounting the red LED 9 and the green LED 10 are provided. The package on which the LED is mounted can be used as each module as it is. For example, a package including at least two white LEDs can be used as the first module 30, and a package including at least a red LED and a green LED can be used as the second module 31.

  In the LED lighting device according to the present embodiment, a larger lighting device can be easily configured by providing a plurality of first modules 30 and second modules 31. In addition, by arranging the first module 30 and the second module 31 alternately, it is possible to further suppress the occurrence of luminance unevenness and color unevenness. For example, the first module 30 and the second module 31 are LED modules that generate different white colors, so that the illumination is wider and has better color rendering than the case where a plurality of the same modules are provided. It can be a device.

  In the LED illumination device according to the present embodiment, a third white LED 12c that emits white light, a blue LED 11 that emits a color other than white, and a variable resistor 4 that controls the current of the white LED 12c and the blue LED 11; Since it is possible to control the currents of the white LED 12c and the blue LED 11 together, for example, by causing the same current to flow through the white LED 12c and the blue LED 11, the occurrence of uneven brightness and uneven color can be suppressed. Can do.

  In the LED lighting device according to the present embodiment, white color is obtained by combining the red LED 9, the green LED 10, and the blue LED 11, so that white color adjustment can be performed. By using LEDs of three primary colors of red, green, and blue (RGB), appropriate color adjustment can be performed regardless of the color of the object. Further, the third circuit 8 in which the white LED 12c and the blue LED 11 are connected in series may be provided, and the first circuit 6, the second circuit 7, and the third circuit 8 may be connected in parallel. Further, a plurality of third circuits 8 in which the white LED 12c and the blue LED 11 are connected in series are provided, and the plurality of third circuits 8 are connected in series, and the first circuit 6, the second circuit 7, and the third circuit 8 are connected. May be connected in parallel. Furthermore, you may make it provide blue LED11 as a 2nd module.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  The LED lighting device in the embodiment of the present invention is, for example, provided on the top of a food circulation transport device that transports food and drink containers such as sushi dishes to food and drink, and transports sushi conveyed by the food circulation transport device. Can be used to illuminate. In the case of illuminating food and drink, the LED lighting device can cause fading and deterioration of the food and drink because there is almost no ultraviolet or infrared light. According to the LED lighting device in the present embodiment, it is possible to irradiate colors close to natural colors by freely changing the chromaticity range, and it is also possible to emphasize only an arbitrary shade, for example, red food ingredients are made red. Luminance can be ensured as well as illumination.

  Moreover, in the said Example, although the case where a variable resistor was used as a control means which controls an electric current was shown, as long as an electric current can be controlled, it is good also as another structure.

DESCRIPTION OF SYMBOLS 1 Power input terminal 2, 3, 4 Variable resistor 5 Current variable control circuit 6 1st circuit 7 2nd circuit 8 3rd circuit 9 Red LED
10 Green LED
11 Blue LED
12a, 12b, 12c White LED
13 Current limiting diode 14 Resistor 15 Transistor 30 First module 31 Second module

Claims (9)

First and second white LEDs emitting white light;
An LED illumination device comprising first and second color LEDs that emit colors other than white,
First control means for controlling currents of the first white LED and the first color LED;
An LED lighting apparatus comprising: a second control unit that controls currents of the second white LED and the second color LED.   The LED lighting device according to claim 1, wherein the first color LED and the second color LED respectively emit different colors.   The LED lighting device according to claim 2, wherein the LED lighting device is white by combining the first color LED and the second color LED. A first circuit in which the first white LED and the first color LED are connected in series;
A second circuit in which the second white LED and the second color LED are connected in series;
The LED lighting device according to claim 1, wherein the first circuit and the second circuit are connected in parallel. Comprising a plurality of the first circuits, connecting the plurality of first circuits in series;
The LED lighting device according to claim 4, comprising a plurality of the second circuits, wherein the plurality of second circuits are connected in series. A first module for mounting the first white LED and the second white LED;
The LED lighting device according to claim 1, further comprising a second module that mounts the first color LED and the second color LED.   The LED lighting device according to claim 6, comprising a plurality of the first and second modules, wherein the first modules and the second modules are alternately arranged. A third white LED that emits white light;
A third color LED that emits a color other than white;
8. The LED according to claim 1, further comprising third control means for controlling currents of the third white LED and the third color LED. 9. Lighting device.   The first color LED, the second color LED, and the third color LED emit light of different colors, respectively, and the first color LED, the second color LED, and the third color LED. The LED lighting device according to claim 8, which becomes white by combining the two.

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