JP2014143307A - Light-emitting module and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of simplifying a wiring layout as much as possible, even when a plurality of light-emitting parts differing in color temperature and adjacent to each other are disposed.SOLUTION: A light-emitting module 1 comprises a substrate 10, eight light-emitting parts 13 each formed in long length and juxtaposed on the substrate 10, and a first electrode 11 and a second electrode 12 provided on the substrate 10. Each of the light-emitting parts 13a, 13b includes ten pieces of LEDs 14a, 14b each electrically connected in series. In the eight light-emitting part 13, a plurality of a set of the light-emitting parts 13a, 13b differing in color temperature from each other and adjacent to each other are included, and the respective LEDs 14a, 14b of which are connected to the first electrode 11 and the second electrode 12 in anti-parallel.

Description

  The present invention relates to a light emitting module and a lighting device, and more particularly to a technique for adjusting luminance and color temperature of emitted light.

  2. Description of the Related Art In recent years, an illumination device that uses a light emitting diode as a light source and can perform color adjustment and light adjustment has been proposed. Patent document 1 is disclosing the light emitting module incorporated in such an illuminating device. FIG. 20 is a plan view showing a light emitting module in Patent Document 1. FIG. As shown in FIG. 20, the light emitting module 900 includes a substrate 910, a first electrode 911a, a second electrode 911b, a third electrode 912, and light emitting units 913a and 913b. The light emitting unit 913a includes a plurality of light emitting diodes 914a and a wavelength conversion member 915a that seals the light emitting diodes 914a in common. Similarly, the light emitting unit 913b includes a plurality of light emitting diodes 914b and a wavelength conversion member 915b that seals the light emitting diodes 914b in common. The light emitting diodes 914a and 914b are blue light emitting diodes. The wavelength conversion member 915a includes a red phosphor that converts blue light into red light. Accordingly, the light emitting unit 913a can emit mixed color light of blue light and red light. The wavelength conversion member 915b includes a yellow phosphor that converts blue light into yellow light. Accordingly, the light emitting unit 913b can emit pseudo white light. Therefore, the light emitting module 900 obtains light in which the mixed color light of the blue light and red light of the light emitting unit 913a and the pseudo white light of the light emitting unit 913b are mixed. The negative electrodes of the light emitting units 913a and 913b are commonly connected to the third electrode 912, whereas the positive electrodes of the light emitting units 913a and 913b are separately connected to the first electrode 911a and the second electrode 911b, respectively. ing. For example, the luminance of the total emitted light of the light emitting module 900 can be adjusted by changing the total amount of the direct current flowing through the light emitting unit 913a and the direct current flowing through the light emitting unit 913b. In addition, by changing the ratio between the magnitude of the direct current flowing through the light emitting section 913a and the magnitude of the DC power source flowing through the light emitting section 913b, the color mixing ratio of the mixed light of blue light and red light and the pseudo white light is changed. Can be made. As a result, the color temperature of the emitted light from the light emitting module 900 can be adjusted.

JP 2012-004519 A

  By the way, in the above conventional light emitting module, the light emitting region is divided into two, a light emitting unit that emits mixed color light of blue light and red light is arranged on one side, and a light emitting unit that emits pseudo white light is arranged on the other side. Therefore, the emitted light from each light emitting part is not easily mixed, and the emitted light from the light emitting module may be uneven in color. On the other hand, for example, it is considered that the light emitting region is divided into three, a light emitting unit that emits mixed light of blue light and red light is arranged at the center, and a light emitting unit that emits pseudo white light is arranged on both sides. It is done. Alternatively, it is conceivable to divide the light emitting region into four or more and alternately arrange light emitting units that emit mixed color light of blue light and red light and light emitting units that emit pseudo white light. That is, it is conceivable to provide a plurality of sets of adjacent light emitting units having different color temperatures. However, in this case, if it is attempted to connect light emitting units having the same color temperature to a common electrode, the wiring layout becomes complicated. When the wiring layout becomes complicated, problems such as an increase in wiring resistance may occur.

  An object of the present invention is to provide a technique capable of simplifying the wiring layout as much as possible even when a plurality of sets of adjacent light emitting units having different color temperatures are arranged.

  In order to achieve the above object, a light-emitting module according to one embodiment of the present invention is provided on a substrate, a plurality of light-emitting portions that are arranged in parallel on the substrate, each having a long shape, and the substrate. Each light-emitting part includes a plurality of light-emitting diodes electrically connected in series, and the plurality of light-emitting parts include the first electrode and the second electrode. The light emitting diodes are connected in antiparallel, and a plurality of sets of adjacent light emitting units having different color temperatures are included.

Further, in the light emitting module, the light emitting units may be arranged in parallel in the circular region on the substrate so that the longitudinal directions thereof are along each other.
In the light emitting module, the length of the outermost light emitting part in the juxtaposed direction of the light emitting parts is shorter than the length of the other light emitting parts in the longitudinal direction, and the outermost light emitting part The light emitting diode and the light emitting diode of the light emitting part adjacent to the light emitting part are connected in series to the first electrode and the second electrode, and the color temperature of the outermost light emitting part and the color of the light emitting part adjacent to the light emitting part The temperature may be the same.

  In the light emitting module, all of the adjacent light emitting units among the plurality of light emitting units are connected in reverse parallel to the first electrode and the second electrode, and have different color temperatures from each other. The length in the longitudinal direction of the outermost light emitting part in the installation direction is shorter than the length in the longitudinal direction of the other light emitting parts, and at least one resistance element is electrically connected to the light emitting diode in the outermost light emitting part. They may be connected in series.

  In the light emitting module, all of the adjacent light emitting units among the plurality of light emitting units are connected in reverse parallel to the first electrode and the second electrode, and have different color temperatures from each other. In the installation direction, the length in the longitudinal direction of the outermost light emitting part is shorter than the length in the longitudinal direction of the other light emitting parts, and the light emission adjacent in the outermost light emitting part in the juxtaposed direction of the light emitting parts. The pitch between the diodes may be narrower than the pitch of adjacent light emitting diodes in other light emitting units.

Further, in the light emitting module, each of the light emitting portions further includes a wavelength conversion member that seals the plurality of light emitting diodes in common, and the cut that appears by cutting each wavelength conversion member along a plane perpendicular to the longitudinal direction thereof In the surface, the upper surface of each wavelength conversion member may have a convex shape.
In the light emitting module, the plurality of light emitting units may be arranged in a circular area on the substrate so as to be radial from the center point of the circle.

Further, in the light emitting module, when seen in a plan view from a direction perpendicular to the substrate, each light emitting portion may be formed in an annular shape, and the plurality of light emitting portions may be arranged concentrically on the substrate. .
Furthermore, the lighting device according to one embodiment of the present invention is a lighting device including a light emitting module and a lighting circuit for causing the light emitting module to emit light, and the light emitting module is provided on the substrate and the substrate. A plurality of light-emitting portions arranged in parallel and each having a long shape; and a first electrode and a second electrode provided on the substrate, each light-emitting portion being electrically connected in series A light emitting diode, and the plurality of light emitting units include a plurality of adjacent light emitting units connected in reverse parallel to the first electrode and the second electrode and having different color temperatures, and the lighting circuit includes the first light emitting unit, An AC power supply electrically connected to the first electrode and the second electrode is provided.

Further, in the lighting device, the lighting circuit is interposed on a current path between the AC power source and the first electrode and the second electrode, and a positive half cycle of the AC current output from the AC power source A toning circuit for individually changing the maximum value with the negative half cycle may be provided.
In the lighting device, the toning circuit may include a peak clip circuit including a DC voltage source and a control circuit that controls an output voltage of the DC voltage source of the peak clip circuit.

In the light-emitting module according to one embodiment of the present invention, there are a plurality of sets of adjacent light-emitting portions having different color temperatures. Thereby, the light emitted from one of the adjacent light emitting units is likely to be mixed with the light emitted from the light emitting units having different color temperatures. Therefore, the color unevenness of the emitted light from the light emitting module can be suppressed.
Further, in the set of light emitting units, adjacent light emitting units are connected in antiparallel to the first electrode and the second electrode. In this configuration, it is conceivable to supply an alternating current to the first electrode and the second electrode in order to drive the light emitting module. In this case, the luminance of the emitted light from the light emitting module can be adjusted by changing the effective value of the supplied alternating current. Further, the color temperature of the light emitted from the light emitting module can be adjusted by changing the ratio between the effective value of the positive half cycle and the effective value of the negative half cycle of the supplied alternating current.

In a light emitting module in which adjacent light emitting units are connected in reverse parallel to the first electrode and the second electrode, the wiring for supplying AC power has a simpler layout than the wiring for supplying DC current. Become.
As described above, according to the present invention, even if a plurality of sets of adjacent light emitting units having different color temperatures are arranged, the wiring layout can be simplified as much as possible.

1 is a schematic diagram of an LED module according to Embodiment 1. FIG. It is a circuit diagram of the LED module shown in FIG. It is a circuit diagram of the lighting circuit connected to the LED module shown in FIG. (A) It is a voltage waveform diagram output from the lighting circuit shown in FIG. 3, (b) It is a current waveform diagram corresponding to the voltage waveform diagram shown in (a). (A) It is a voltage waveform diagram when changing the positive / negative effective value ratio of the alternating current output from the lighting circuit shown in FIG. 3, (b) Current waveform diagram corresponding to the voltage waveform diagram shown in (a) It is. (A) It is a voltage waveform diagram when changing the positive / negative effective value ratio of the alternating current output to the lighting circuit shown in FIG. 3, and (b) is a current waveform diagram corresponding to the voltage waveform diagram shown in (a). is there. It is an illuminating device using the LED module shown in FIG. It is a perspective view of the lamp unit in the illuminating device shown in FIG. It is a schematic diagram which shows the modification of the LED module shown in FIG. It is a schematic diagram which shows the modification of the LED module shown in FIG. It is a schematic diagram which shows the modification of the LED module shown in FIG. 6 is a schematic diagram of an LED module according to Embodiment 2. FIG. 6 is a schematic diagram of an LED module according to Embodiment 3. FIG. 6 is a schematic diagram of an LED module according to Embodiment 4. FIG. 6 is a schematic diagram of an LED module according to Embodiment 5. FIG. 10 is a schematic diagram of an LED module according to Embodiment 6. FIG. 12 is a schematic diagram of an LED module according to Embodiment 7. FIG. 10 is a schematic diagram of an LED module according to Embodiment 8. FIG. It is a circuit diagram of the LED module shown in FIG. It is a top view of the conventional light emitting module.

<< Embodiment 1 >>
1. Configuration Embodiment 1 for carrying out the present invention will be described in detail with reference to the drawings.
The materials and numerical values used in the embodiments of the invention are merely preferred examples, and the present invention is not limited to these forms. In addition, changes can be made as appropriate without departing from the scope of the technical idea of the present invention. Furthermore, combinations with other embodiments are possible to the extent that no contradiction occurs.

Here, a mode in which an LED (Light Emitting Diode) is used as the semiconductor light emitting diode will be described. Note that the symbol “˜” used to indicate a numerical range includes numerical values at both ends.
1 is a schematic diagram of an LED module according to Embodiment 1. FIG. FIG. 2 is a circuit diagram of the LED module.

As shown in FIG. 1, the LED module 1 includes a substrate 10, a plurality of (eight in the present embodiment) light emitting units 13 each having a long shape, and a first electrode 11 provided on the substrate 10. And a second electrode 12.
(substrate)
The board | substrate 10 consists of insulating materials, such as ceramics and a heat conductive resin, for example, and is a rectangular plate-shaped member. The configuration of the substrate 10 is not limited to a configuration made of an insulating material as a whole, and may have a multilayer structure of an insulating layer and a metal layer. The metal layer may be made of aluminum, for example. The substrate 10 has a square light emitting region 10a. One side of the light emitting region 10a is, for example, 13 mm to 15 mm.

(First electrode and second electrode)
The first electrode 11 and the second electrode 12 are members made of a conductive material such as gold or copper, for example. Wiring 11a and 12a are extended from the edge part of the 1st electrode 11 and the 2nd electrode 12 toward the light emission area | region 10a, respectively. The wirings 11a and 12a are branched into the same number as the number of the light emitting units 13 before the light emitting region 10a.

(Light emitting part)
In the light emitting region 10a on the substrate 10, eight light emitting portions 13 are arranged in parallel so that their longitudinal directions are parallel to each other. The light emitting unit 13 is divided into light emitting units 13a and 13b for each color temperature of light emission. The light emitting units 13a and 13b having different color temperatures are arranged adjacent to each other. The light emitting unit 13a includes ten LEDs 14a arranged in a row on the substrate 10, and a long wavelength conversion member 15a that seals the LEDs 14a in common. The same applies to the light emitting unit 13b. The LEDs 14a and 14b are, for example, blue LED chips. The wavelength conversion members 15a and 15b are made of a translucent resin material mixed with at least one phosphor. As the translucent resin material, for example, a silicone resin can be used. As the phosphor, for example, a mixture of a green phosphor and a red phosphor or a yellow phosphor can be used. In the present embodiment, the phosphors contained in the wavelength conversion members 15a and 15b are both mixed with a green phosphor and a red phosphor. In this case, in order to change the color temperature of light emission of the light emitting units 13a and 13b, the ratio of the red phosphor to the green phosphor mixed in the wavelength conversion members 15a and 15b may be varied. In the present embodiment, the ratio of the red phosphor in the wavelength conversion member 15a is decreased, and the ratio of the red phosphor in the wavelength conversion member 15b is increased. Therefore, the color temperature of the emitted light from the light emitting unit 13a is higher, for example, 7000K to 18000K. The color temperature of the emitted light from the light emitting unit 13b is lower, for example, 2000K to 5000K.

  In order to manufacture each light emitting part 13a, 13b, first, the LEDs 14a, 14b are mounted using COB (Chip on Board) technology. Thereafter, the wavelength converting members 15a and 15b may be dispensed and finally cured. Thereby, the upper surfaces of the wavelength conversion members 15a and 15b have, for example, a convex shape in the cut surfaces that appear when the wavelength conversion members 15a and 15b are cut along a plane perpendicular to the longitudinal direction thereof. If this manufacturing method is used, even if there is no partition layer between the adjacent light emitting sections 13, the light emitting sections 13a and 13b having different color temperatures can be arranged adjacent to each other. And in this structure, since the emitted light from the light emission part 13 is not blocked | interrupted by a partition layer, the emitted light of the adjacent light emission parts 13a and 13b is easy to be mixed. Moreover, if this manufacturing method is used, it will be easy to manufacture each light emission part 13 with the same shape and magnitude | size. If each light emitting part 13 has the same shape and size, the emission angles of the emitted light are equal, and the emitted light of the adjacent light emitting parts 13a and 13b is likely to be mixed.

  Hereinafter, electrical connection of the light emitting unit 13 will be described. In the light emitting unit 13a, the LEDs 14a arranged in a row are connected to each other by a wire. Moreover, LED14a located in the end (left side of drawing) of the light emission part 13a is connected to the wiring 11a with the wire. The LED 14a located at the other end (right side of the drawing) of the light emitting unit 13a is connected to the wiring 12a by a wire. The same applies to the light emitting unit 13b. As shown in the circuit diagram of FIG. 2, the light emitting unit 13 a and the light emitting unit 13 b are electrically connected in reverse parallel to the first electrode 11 and the second electrode 12. Specifically, the anode electrode of the LED 14 a located at one end (the left side of the drawing) of the light emitting unit 13 a is connected to the first electrode 11. In addition, the cathode electrode of the LED 14 a located at the other end (right side of the drawing) of the light emitting unit 13 a is connected to the second electrode 12. On the other hand, the cathode electrode of the LED 14 b located at one end (left side of the drawing) of the light emitting unit 13 b is connected to the first electrode 11. Further, the anode electrode of the LED 14 b located at the other end (right side of the drawing) of the light emitting unit 13 b is connected to the second electrode 12.

  As described above, since the light emitting units 13a and 13b are connected in reverse parallel to each other, when an alternating current is supplied to the light emitting unit 13, for example, in the positive half cycle of the alternating current, the light emitting unit 13a emits light. In the negative half cycle, the light emitting unit 13b emits light. The frequency of the alternating current may be arbitrary, but is an alternating current having a frequency of 50 kHz, for example. When the alternating current is supplied to drive the LED module 1, the light emitting units 13a and 13b are alternately lit. Therefore, the higher the frequency of the alternating current, the higher the effect of suppressing flickering of the emitted light. When an alternating current having a frequency of 50 kHz is used, the light emission of the LED module 1 appears to the user as a mixed color of the light emitting portions 13a and 13b, and flickering of the emitted light can be suppressed.

  In the present embodiment, four light emitting portions 13a and 13b having different color temperatures are arranged adjacent to each other in the light emitting region 10a. With this configuration, much of the light emitted from the light emitting unit 13a appears to overlap with the light emitted from the light emitting unit 13b. Thereby, the emitted light from the light emitting part 13a is easily mixed with the emitted light from the adjacent light emitting parts 13. Therefore, the color unevenness of the emitted light from the LED module 1 can be suppressed.

  Further, the light emitting unit 13 a and the light emitting unit 13 b are electrically connected in reverse parallel to the first electrode 11 and the second electrode 12. Therefore, the luminance of the emitted light from the LED module 1 can be adjusted by changing the effective value of the alternating current supplied to the LED module 1. Moreover, the color temperature of the emitted light of the LED module 1 can be adjusted by changing the ratio between the effective value of the positive half cycle and the effective value of the negative half cycle of the supplied alternating current.

  By the way, when supplying an alternating current, the electrode (for example, electrode 11) connected to the one end side of the light emission part 13a and the light emission part 13b, and the electrode (for example, electrode) connected to the other end side of the light emission part 13a and the light emission part 13b The wiring may be connected to a total of two electrodes (12). In the LED module 1, the wirings 11 a and 12 a are branched into the same number as the number of rows of the light emitting units 13 before the light emitting region 10 a and are connected to the respective light emitting units 13, thereby supplying an alternating current to the LED module 1. it can. Thus, in the LED module 1 that can supply an alternating current, the layout of the wirings 11a and 12b is simpler than when a direct current is supplied. On the other hand, when supplying a direct current, an electrode connected to the anode of the light emitting unit 13a, an electrode connected to the anode of the light emitting unit of the light emitting unit 13b, and an electrode connected to the cathode of the light emitting unit 13a and the light emitting unit 13b Wiring needs to be connected to a total of three electrodes. Therefore, the wiring layout becomes complicated.

As described above, according to the present embodiment, the layout of the wirings 11a and 12a can be simplified as much as possible even if a plurality of sets of adjacent light emitting units 13a and 13b having different color temperatures are arranged.
2. Hereinafter, an example of a lighting circuit that supplies an alternating current to the LED module 1 will be described.

(Configuration of lighting circuit)
FIG. 3 is a circuit diagram of a lighting circuit connected to the LED module 1.
As shown in FIG. 3, the lighting circuit 24 includes an AC power source 31, a transformer 32, a dimming circuit 33, a toning circuit 34, a control unit 36, and external terminals 37 and 38 connected to the power line. .

The AC power source 31 corresponds to a high-frequency power source that generates, for example, high-frequency AC power of 50 kHz from AC power supplied from a commercial power source.
The transformer 32 steps down the AC voltage input from the AC power supply 31. Specifically, the transformer 32 steps down the amplitude of the input AC voltage from, for example, 100V to 60V.

  The dimmer circuit 33 performs an operation of outputting the AC voltage input from the transformer 32 to the toning circuit 34 during the conduction period and not outputting the input AC voltage to the toning circuit 34 during the non-conduction period. The dimming circuit 33 includes a variable resistance element 41, a capacitor 42, a diac element 43, and a triac element 44. The resistance value of the variable resistance element 41 changes according to a resistance value signal output from the control unit 36. As the resistance value of the variable resistance element 41 increases, the conduction period of the dimmer circuit 33 decreases. That is, in the dimming circuit 33, the ratio between the conduction period and the non-conduction period changes by changing the resistance value of the variable resistance element 41. Thereby, the effective value of the alternating current output from the light control circuit 33 changes.

  The toning circuit 34 is a so-called peak clip circuit that changes the ratio between the effective value of the positive half cycle and the effective value of the negative half cycle of the input alternating current. The toning circuit 34 includes diode elements 45 and 46 and variable DC power sources 47 and 48. The DC voltage output from the variable DC power supplies 47 and 48 varies depending on the voltage signal output from the control unit 36. When the DC voltage output from the variable DC power source 47 changes, the maximum value of the positive half cycle of the AC current output from the toning circuit 34 changes. As the absolute value of the DC voltage of the variable DC power supply 47 increases, the maximum value of the positive half cycle of the AC current output from the toning circuit 34 increases. When the DC voltage output from the variable DC power supply 48 changes, the negative half-cycle effective value of the AC power output from the toning circuit 34 changes. As the absolute value of the DC voltage of the variable DC power supply 48 increases, the maximum value of the negative half cycle of the AC current output from the toning circuit 34 increases. Thus, by changing the DC voltage output from the variable DC power supplies 47 and 48, the ratio of the positive and negative effective values of the AC current output from the toning circuit 34 can be changed. In practice, the DC voltage output from the variable DC power supplies 47 and 48 is a DC voltage obtained by rectifying and smoothing the AC voltage output from the AC power supply 31. Here, for the sake of simplicity, description is made using variable DC power supplies 47 and 48.

  The controller 35 is, for example, a remote controller having a function that allows the user to adjust the brightness and color temperature of the emitted light from the LED module 1. When the controller 35 receives an instruction to adjust the brightness of the emitted light of the LED module 1 from the user, the controller 35 transmits a brightness control signal indicating the instructed brightness to the outside. When the controller 35 receives an instruction to adjust the color temperature of the emitted light from the LED module 1 from the user, the controller 35 transmits a color temperature control signal indicating the instructed color temperature to the outside.

When receiving the brightness control signal from the controller 35, the control unit 36 adjusts the resistance value of the variable resistance element 41 of the dimming circuit 33 based on the brightness control signal. In addition, when receiving the color temperature adjustment signal from the controller 35, the control unit 36 adjusts the output voltages of the variable DC power sources 47 and 48 of the color adjustment circuit 34 based on the color temperature adjustment signal.
The external terminals 37 and 38 are connected to the electrodes 11 and 12 of the LED module 1, respectively.

(Dimming operation)
In order to dim the LED module 1, the effective value of the alternating current output from the dimming circuit 33 is adjusted as follows.
First, the basic operation of the dimming circuit 33 will be described. In the positive half cycle of the alternating current output from the secondary coil of the transformer 32, electric charge is accumulated in the capacitor. When the capacitor 42 is fully charged, the diac element 43 becomes conductive, and a current flows through the gate of the triac element 44. As a result, the triac element 44 becomes conductive, and a current flows from point A to point B. On the other hand, in the negative half cycle of the alternating current output from the secondary coil of the transformer 32, the capacitor 42 charged in the positive half cycle of the alternating current is discharged, the diac element 43 becomes conductive, and the triac element 44 Current flows through the gate. As a result, the triac element 44 becomes conductive, and a current flows from point B to point A.

  Here, when the resistance value of the variable resistance element 41 changes, the time until the capacitor 42 is fully charged changes. The time from the start of the positive half cycle of the alternating current output from the secondary coil of the transformer 32 until the capacitor 42 is fully charged is the non-conduction period of the dimming circuit 33. The AC voltage waveform output from the dimming circuit 33 is shown in FIG. Thus, the light control circuit 33 can output the alternating voltage which has the non-conduction period T1 and the conduction period T2. A current waveform corresponding to the AC voltage waveform is shown in FIG. The solid line in the figure indicates the AC current waveform, and the broken line indicates the AC voltage waveform. Note that the waveform diagrams in FIG. 4 both show schematic waveforms.

  When the ratio of the non-conduction period T1 to the conduction period T2 increases, the effective value of the alternating current output from the dimming circuit 33 decreases, and the luminance of the emitted light from the LED module 1 decreases. On the other hand, when the ratio of the non-conduction period T1 to the conduction period T2 decreases, the effective value of the alternating current output from the dimming circuit 33 increases, and the luminance of the emitted light from the LED module 1 increases.

(Toning operation)
To adjust the color of the LED module 1, the ratio between the effective value of the positive half cycle and the effective value of the negative half cycle of the alternating current output from the toning circuit 34 is adjusted as follows.
When the DC voltages output from the variable DC power sources 47 and 48 are V1 and V2, respectively, the AC voltage output from the toning circuit 34 has a voltage waveform as shown in FIG. The alternating current output from the toning circuit 34 has a waveform having a maximum value I1 in the positive half cycle and a maximum value I2 in the negative half cycle as shown in FIG. 5B. The solid line in the figure indicates the AC current waveform, and the broken line indicates the AC voltage waveform. In addition, the waveform diagram of FIG. 5 shows a schematic waveform in the same manner as in FIG. When V1 = V2, since I1 = I2, the ratio of the emitted light from the light emitting unit 13a and the light emitting unit 13b is equal. When V1> V2, since I1> I2, the emitted light from the light emitting unit 13a is larger than the emitted light from the light emitting unit 13b. In the present embodiment, since the color temperature of the light emitting unit 13a is higher than the color temperature of the light emitting unit 13b, the color temperature of the emitted light from the LED module 1 is increased. When V1 <V2, since I1 <I2, the emitted light from the light emitting unit 13a is smaller than the emitted light from the light emitting unit 13b. Therefore, the color temperature of the emitted light from the LED module 1 is lowered. For example, FIG. 6A shows a voltage waveform when V1 <V2. In this example, the DC voltage V1 of the variable DC power supply 47 is greater than zero and smaller than the amplitude of the AC voltage output from the transformer 32. The DC voltage V2 of the variable DC power supply 48 is the same as the amplitude of the AC voltage output from the transformer 32. At this time, the alternating current output from the toning circuit 34 has a waveform in which the maximum value is I1 in the positive half cycle and the maximum value is I2 in the negative half cycle as shown in FIG. The solid line in the figure indicates the AC current waveform, and the broken line indicates the AC voltage waveform. For example, V1 and V2 may be about 20V to 60V. The waveform diagram of FIG. 6 shows a schematic waveform as in FIGS. 4 and 5.

When dimming is performed by the toning circuit 34, the effective value of the alternating current at the point C is smaller than the effective value of the alternating current at the point B. Therefore, the control unit 36 adjusts the alternating current output from the dimming circuit 33 in consideration of the amount that is reduced by the toning circuit 34.
3. Application Example Hereinafter, an illumination device using the LED module 1 will be described as an application example of the LED module 1. FIG. 7 is an illumination device using the LED module 1. FIG. 8 is a perspective view of a lamp unit in the illumination device.

(overall structure)
As shown in FIG. 7, the light emitting device 20 is a downlight attached to be embedded in the ceiling 22. The light emitting device 20 includes an instrument 23, a lighting circuit 24, and a lamp unit 26.
The instrument 23 is made of metal and includes a lamp housing part 23a, a circuit housing part 23b, and an outer casing part 23c. The lamp housing portion 23a has a bottomed cylindrical shape, and the lamp unit 26 is detachably attached therein. The circuit accommodating part 23b is extended on the bottom side of the lamp accommodating part 23a, and the lighting circuit 24 is accommodated therein. The outer flange portion 23c has an annular shape, and extends outward from the opening of the lamp housing portion 23a.

In the appliance 23, the lamp housing portion 23 a and the circuit housing portion 23 b are embedded in an embedding hole 22 a that penetrates the ceiling 22. Further, the attachment of the appliance 23 to the ceiling 22 is performed in a state where the outer flange portion 23c is in contact with the peripheral portion of the embedding hole 22a on the lower surface 22b of the ceiling 22.
The lighting circuit 24 is a circuit for causing the LED module 1 to emit light. The lighting circuit 24 is connected to a power supply line 24 a that is electrically connected to the lamp unit 26. A connector 24b detachably connected to the connector 29 of the lead wire 28 of the lamp unit 26 is attached to the tip of the power supply line 24a.

(Lamp unit configuration)
As shown in FIG. 8, the lamp unit 26 incorporates the LED module 1 as a light source. The lamp unit 26 includes a base 26 a, a cover 26 b, a cover pressing member 26 c, and a wiring member 27.
The base 26a is a disk-shaped member made of aluminum. In addition, the LED module 1 is mounted in the center on the upper surface side of the base 26a. The cover 26b is made of a translucent material such as silicone resin, acrylic resin, or glass, and has a dome shape. Further, the light emitted from the LED module 1 passes through the cover 26b and is extracted to the outside of the lamp unit 26. The cover pressing member 26c is made of a non-translucent material such as a metal such as aluminum or a white opaque resin, and has an annular plate shape that does not block the light emitted from the LED module 1. The wiring member 27 has a set of lead wires 28 electrically connected to the LED module 1. The lead wire 28 is led out of the lamp unit 26 and a connector 29 is attached to the end thereof.

4). By the way, in the LED module described above, the light emitting region has a square shape. However, the shape of the light emitting region may be, for example, a circular shape. A modification to this will be described below.
9 to 11 are schematic views showing modifications of the LED module shown in FIG. In the LED module shown in FIGS. 9 to 11, the light emitting area is circular. The diameter of the light emitting region is, for example, 13 mm to 15 mm. Since the light emitting region has a circular shape, the length of the light emitting portion in the longitudinal direction becomes shorter from the light emitting portion on the center side of the light emitting region toward the light emitting portion on the outside. Therefore, in the juxtaposed direction of the light emitting units, the length of the outermost light emitting unit in the longitudinal direction is shorter than the length of the other light emitting units in the longitudinal direction. Thus, when the light emitting area is circular, ten LEDs may not be mounted in the outermost light emitting section. When an alternating current of the same magnitude as that of the other light emitting units having 10 LEDs connected in series is passed through the outermost light emitting unit in which a small number of LEDs are connected in series, the LED in the outermost light emitting unit is large. An alternating current flows and these LEDs may be damaged. The following modification takes measures against this problem.

  As shown in FIG. 9, in the LED module 100, the light emitting portion 113a1 arranged on the outermost side in the direction in which the light emitting portions 113 are arranged in the light emitting region 110a and the light emitting portion 113a2 adjacent to the light emitting portion 113a1 are wired. Are connected in series and have the same color temperature. The same applies to the outermost light emitting portion 113b1 and the light emitting portion 113b2 adjacent to the light emitting portion 113b1. The light emitting unit 113a1 and the light emitting unit 113b1 each include three LEDs 14a and 14b. The light emitting unit 113a2 and the light emitting unit 113b2 include seven LEDs 14a and 14b, respectively. Thereby, the same voltage as the voltage applied to the LEDs of the other light emitting units 113 is also applied to the LEDs of the light emitting unit 113 arranged on the outermost side. Therefore, it can suppress that a big alternating current flows into LED14a, 14b contained in the outermost light emission part 13. FIG. As a result, it can suppress that LED14a, 14b is damaged.

  Further, as shown in FIG. 10, the number of LEDs 14a and 14b included in the outermost light emitting units 213a and 213b in the parallel arrangement direction of the light emitting units 13 in the light emitting region 110a is 5, respectively. The number of LEDs 14a and 14b included in the other light emitting units 13a and 13b is 10 respectively. In addition, one resistive element 216 is electrically connected in series to each of the LEDs 14a and 14b included in the light emitting units 213a and 213b. The resistance value of the resistance element 216 compensates for the voltage of five LEDs. In the LED module 200, an alternating current also flows through the resistance element 216 in the outermost light emitting units 213a and 213b. Therefore, it can suppress that a big alternating current flows into LED14a, 14b. As a result, it can suppress that LED14a, 14b is damaged. In the LED module 200, the resistance element 216 is disposed in the light emitting units 213a and 213b. However, the present invention is not limited thereto, and may be disposed outside the light emitting units 213a and 213b. Thereby, when the resistive element 216 is arrange | positioned in the light emission parts 213a and 213b, the problem that the arrangement | positioning part of the resistive element 216 will become dark can be suppressed. As a result, it is possible to further suppress variations in luminance of the emitted light in the light emitting units 213a and 213b.

  Furthermore, as shown in FIG. 11, the pitch between the adjacent LEDs 314 a and 314 b included in the light emitting units 313 a and 313 b arranged on the outermost side in the parallel arrangement direction of the light emitting units 313 in the light emitting region 110 a The pitch is narrower than the pitch between adjacent LEDs 14a, 14b included in the light emitting units 13a, 13b. In addition, the lateral width of the LEDs 314a and 314b is narrower than the lateral width of the LEDs 14a and 14b. Thereby, the number of LED14a, 14b, 314a, 314b contained in each light emission part 313 can be made the same. Therefore, it is possible to suppress application of a large alternating voltage to the LEDs 314a and 314b. As a result, it is possible to prevent the LEDs 314a and 314b from being damaged.

<< Embodiment 2 >>
In the first embodiment, light emitting portions having different color temperatures in one direction are arranged side by side in a square light emitting region. However, the present invention is not limited to this. For example, light emitting units having different color temperatures in two directions may be arranged side by side in a square light emitting region.
FIG. 12 is a schematic diagram of an LED module according to the second embodiment.

As shown in FIG. 12, the LED module 400 includes a wiring 411 c that bisects a square light emitting region 10 a in a direction perpendicular to the longitudinal direction of the light emitting unit 413, and 16 light emitting units 413. In addition, the light emitting unit 413a and the light emitting unit 413b are arranged adjacent to each other with the wiring 411c interposed therebetween.
In the LED module 400, much of the light emitted from the light emitting unit 413a appears to overlap with the light emitted from the light emitting unit 413b, as compared with the first embodiment. Thereby, the emitted light from LED14a of the light emission part 413a tends to be mixed with the emitted light from LED14b of the light emission part 413b from which color temperature differs. Therefore, it is possible to provide the LED module 400 that further suppresses the color unevenness of the emitted light.

<< Embodiment 3 >>
In the first embodiment, the plurality of light emitting units are arranged in parallel so that the longitudinal direction thereof is along. However, the present invention is not limited to this. For example, a plurality of light emitting units may be arranged radially.
FIG. 13 is a schematic diagram of an LED module according to Embodiment 3.
As shown in FIG. 13, in the LED module 500, the light emitting section 513 is arranged in a circular light emitting area 110a so as to be radial from the center point of the light emitting area 110a. That is, the light emitting part 513 is arranged in one annular shape. The wiring 511a extending from the first electrode 11 and the wiring 512a extending from the second electrode 12 are formed in an annular shape. The substrate 10 is provided with a through-hole 10b, and the second electrode 12 and a power supply lead wire (not shown) routed from the back surface of the substrate 10 are connected via the through-hole 10b. In the LED module 500, all the light emitting units 513a in the light emitting region 110a are adjacent to the light emitting units 513b having different color temperatures. Therefore, much of the light emitted from the light emitting unit 513a appears to overlap with the light emitted from the light emitting unit 513b. Thereby, the emitted light from the light emitting unit 513a is likely to be mixed with the emitted light from the light emitting unit 513b having a different color temperature. Therefore, it is possible to provide the LED module 500 that further suppresses the color unevenness of the emitted light.

<< Embodiment 4 >>
In the third embodiment, the light emitting unit 513 is arranged in one annular shape. However, the present invention is not limited to this. For example, the light emitting units may be arranged in two annular shapes.
FIG. 14 is a schematic diagram of an LED module according to Embodiment 4.
As shown in FIG. 14, in the LED module 600, the light emitting section 613 is arranged in a circular light emitting area 110a so as to be radial from the center point of the light emitting area 110a. Moreover, the light emission part 613 is arrange | positioned at two annular shapes. The wirings 611c and 611d extending from the first electrodes 611a and 611b and the wiring 612a extending from the second electrode 612 are formed in an annular shape. The first electrode 611b and a power supply lead wire (not shown) routed from the back surface of the substrate 10 are connected through a through hole 10b provided in the substrate 10. In the LED module 600, by applying an AC voltage to the first electrode 611b and the second electrode 612, the inner light emitting unit 613 can emit light. Further, by applying an alternating voltage to the first electrode 611a and the second electrode 612, the outer light emitting unit 613 can emit light. In this way, the inside and outside of the light emitting area 10a of the LED module 600 can be individually dimmed. It is also possible to switch between the operation of emitting light only inside the light emitting region 10a of the LED module 600 and the operation of emitting light of the entire light emitting region 10a of the LED module 600. As described above, in the LED module 600, the size of the light emission area can be changed.

Hereinafter, in Embodiments 5 to 7, other shapes and arrangements of the light emitting units in the LED module will be described.
<< Embodiment 5 >>
FIG. 15 is a schematic diagram of an LED module according to Embodiment 5.
As shown in FIG. 15, each light emission part 713 is formed in the semi-annular shape. The plurality of light emitting portions 713 are concentrically arranged in a circular light emitting region 110 a on the substrate 10. In addition, the light emitting unit 713a and the light emitting unit 713b are arranged adjacent to each other with the wirings 11a and 12a interposed therebetween. Even with this configuration, it is possible to provide an LED module 700 in which a plurality of sets of adjacent light emitting units having different color temperatures are arranged and the wirings 11a and 12a can be easily patterned.

<< Embodiment 6 >>
FIG. 16 is a schematic diagram of an LED module according to the sixth embodiment.
In the LED module 800, a wiring 811c is provided so as to be perpendicular to the wirings 11a and 12a and bisect the light emitting region 110a. In addition, the light emitting portion 813a and the light emitting portion 813b are arranged adjacent to each other with the wiring 811c interposed therebetween. In the LED module 800, the outgoing light from the light emitting portion 813a and the outgoing light from the light emitting portion 813b are mixed on the wiring 811c. Thereby, the emitted light from the light emitting part 813a is more likely to be mixed with the emitted light from the light emitting part 813b than the LED module 700. Therefore, it is possible to provide the LED module 800 that further suppresses the color unevenness of the emitted light.

<< Embodiment 7 >>
FIG. 17 is a schematic diagram of an LED module according to the seventh embodiment.
The LED module 1000 has a diamond-shaped light emitting region 1010a. The light emitting units 1013a and 1013b are formed in a long shape. The plurality of light emitting units 1013 are arranged concentrically within the light emitting region 1010 a on the substrate 10. Furthermore, a wiring 1011c is provided so as to be perpendicular to the wirings 11a and 12a and bisect the light emitting region 10a. In addition, the light emitting unit 1013a and the light emitting unit 1013b are arranged adjacent to each other with the wirings 11a and 12a and the wiring 1011c interposed therebetween. Thus, even if the light emitting region 1010a has a rhombus shape, it is possible to provide an LED module 1000 in which a plurality of sets of adjacent light emitting units having different color temperatures are arranged and the wirings 11a and 12a can be easily patterned. The light emitting region is not limited to a square shape, a circular shape, or a rhombus shape, but may be an elliptical shape, a rectangular shape, or other polygonal shapes.

<< Embodiment 8 >>
In the above-described embodiment and the like, light emitting units having two different color temperatures are used. However, the present invention is not limited to this. For example, light emitting units having three different color temperatures may be used.
FIG. 18 is a schematic diagram of an LED module according to the eighth embodiment. The eighth embodiment is the same as the third embodiment except that a light emitting unit having three different light emission color temperatures is used.

  In the LED module 1100, the light emitting units 1113a, 1113b1, and 1113b2 have different color temperatures for light emission. The LEDs 14a, 14b, 1114c are, for example, blue LED chips. The wavelength conversion members 15a, 15b, and 15c are made of, for example, a resin material in which a green phosphor and a red phosphor are mixed, and the mixing ratios of the phosphors are different. The color temperature of the emitted light from the light emitting unit 1113a is higher, for example, 7000K to 18000K. The color temperature of the emitted light from the light emitting unit 1113b1 is lower, for example, 3000K to 5000K. The color temperature of the emitted light from the light emitting unit 1113b1 is even lower, for example, 2000K to 3000K.

  A circuit diagram of the LED module 1100 is shown in FIG. As shown in FIG. 19, the adjacent light emitting units 1113 a and the light emitting units 1113 b 1 and 113 b 2 are connected to the first electrode 11 and the second electrode 12 in antiparallel. In the LED module 1100, the LED 14a of the light emitting unit 1113a emits light in the positive half cycle of the alternating current. On the other hand, in the negative half cycle of the alternating current, the LEDs 14b and 1114c of the light emitting unit 1113b emit light.

In this way, even when light emitting portions having different color temperatures are used, an LED module 1100 is provided in which a plurality of adjacent light emitting portions having different color temperatures are arranged and the wirings 11a and 12a can be easily patterned. it can.
In addition, when changing the color temperature of the light emission part 1113b, it is possible to electrically connect a resistance element to LED1114c in series. By changing the resistance value of the resistance element, the magnitude of the AC voltage applied to the LED 1114c can be changed. Specifically, the color temperature of the light emitting unit 1113b is a mixture of the light emitting unit 1113b1 and the light emitting unit 1113b2, and the larger the resistance value of the resistance element, the more the influence of the color temperature of the emitted light from the light emitting unit 1113b2 is. Get smaller.

<< Modification >>
1. Number and Arrangement of Light Emitting Units In Embodiment 1, eight long light emitting units are provided in a square light emitting region having a side of 13 mm to 15 mm, but the present invention is not limited to this. For example, you may provide 20 elongate light emission parts in the square light emission area | region whose diameter is 40 mm. Thus, an arbitrary number of light emitting portions can be provided in a light emitting region having a desired size.

2. Configuration of Light Emitting Unit In the above-described embodiment, etc., the case where the LED is mounted using COB (Chip on Board) technology and the wavelength conversion member material is dispensed to form the light emitting unit has been described. Not limited to. For example, an LED using SMD (Surface Mount Device) technology may be used.

Further, in the above-described embodiment and the like, an embodiment using an LED as an LED has been described, but the LED is, for example, an LD (laser diode) or an EL element (including an electric luminescence element, organic and inorganic). May be. Moreover, you may use combining these.
Furthermore, in said embodiment etc., the luminescent color of LED was blue, and this was converted into red light and green light by the wavelength conversion member. Here, the phosphor particles in the case where the LED module emits white light or a light bulb color may be other combinations. As another example of the combination, an LED that emits ultraviolet light is used, and three types of phosphor particles are used: particles that convert to red light, particles that convert to green light, and particles that convert to blue light. it can. In addition, the structure which made the luminescent color of LED itself other colors, such as blue and green, may be sufficient.

LED module 1
Board 10
Light emitting area 10a
First electrode 11
Second electrode 12
Light emitting part 13, 13a, 13b
LED 14a, 14b
Wavelength conversion member 15a, 15b

Claims (11)

A substrate,
A plurality of light-emitting portions arranged in parallel on the substrate, each having an elongated shape;
A first electrode and a second electrode provided on the substrate;
With
Each light emitting unit includes a plurality of light emitting diodes electrically connected in series,
The plurality of light emitting units include a plurality of sets of adjacent light emitting units in which the light emitting diodes are connected in antiparallel to the first electrode and the second electrode, and the color temperatures are different from each other.
A light emitting module characterized by that. In the circular region on the substrate, the light emitting units are arranged side by side so that their longitudinal directions are along each other.
The light-emitting module according to claim 1. The length in the longitudinal direction of the outermost light emitting part in the juxtaposed direction of the light emitting parts is shorter than the length in the longitudinal direction of the other light emitting parts,
The light emitting diode of the outermost light emitting unit and the light emitting diode of the light emitting unit adjacent to the light emitting unit are connected in series to the first electrode and the second electrode, and the color temperature of the outermost light emitting unit and the light emitting unit The color temperature of the light emitting part adjacent to the same is the same,
The light emitting module according to claim 2. Among the plurality of light emitting units, all of the adjacent light emitting units are connected in antiparallel to the first electrode and the second electrode, and the color temperatures are different from each other,
The length in the longitudinal direction of the outermost light emitting part in the juxtaposed direction of the light emitting parts is shorter than the length in the longitudinal direction of the other light emitting parts,
At least one resistance element is electrically connected in series to the light emitting diode in the outermost light emitting section,
The light emitting module according to claim 2. Among the plurality of light emitting units, all of the adjacent light emitting units are connected in antiparallel to the first electrode and the second electrode, and the color temperatures are different from each other,
In the juxtaposed direction of the light emitting parts, the length in the longitudinal direction of the outermost light emitting part is shorter than the length in the longitudinal direction of the other light emitting parts,
In the juxtaposed direction of the light emitting units, the pitch between the adjacent light emitting diodes in the outermost light emitting unit is narrower than the pitch of the adjacent light emitting diodes in the other light emitting units,
The light emitting module according to claim 2. Each of the light emitting units further includes a wavelength conversion member that seals the plurality of light emitting diodes in common,
In the cut surface that appears by cutting each wavelength conversion member in a plane perpendicular to its longitudinal direction, the upper surface of each wavelength conversion member has a convex shape,
The light-emitting module according to claim 1. In the circular area on the substrate, the plurality of light emitting units are arranged so as to be radial from the center point of the circle,
The light-emitting module according to claim 1. When seen in a plan view from a direction perpendicular to the substrate, each light emitting part is formed in an annular shape,
On the substrate, the plurality of light emitting units are arranged concentrically.
The light-emitting module according to claim 1. A light emitting module;
A lighting circuit for causing the light emitting module to emit light;
A lighting device comprising:
The light emitting module
A substrate,
A plurality of light-emitting portions arranged in parallel on the substrate, each having an elongated shape;
A first electrode and a second electrode provided on the substrate;
With
Each light emitting unit includes a plurality of light emitting diodes electrically connected in series,
The plurality of light emitting units include a plurality of sets of adjacent light emitting units that are connected in reverse parallel to the first electrode and the second electrode and have different color temperatures.
The lighting circuit is
An AC power supply electrically connected to the first electrode and the second electrode,
A lighting device characterized by that. The lighting circuit is
The maximum values of the positive half cycle and the negative half cycle of the alternating current output by the alternating current power source, which are inserted on the current path between the alternating current power source and the first electrode and the second electrode, are individually set. With a toning circuit to change,
The lighting device according to claim 9. The toning circuit is
A peak clipping circuit including a DC voltage source;
A control circuit for controlling the output voltage of the DC voltage source of the peak clip circuit;
Comprising
The lighting device according to claim 10.

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