JP2011222542A - Light-emitting element and emission color control system thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting element capable of emitting a light of a color similar to a particular color when a power-supply voltage is applied.SOLUTION: A light-emitting element 10 writes driving current values of each of the LED chips 11-13 in a flash memory 16 when a MCU 15 takes a writing order from outside. The flash memory 16 already has the driving current values of each the LED chips 11-13 written so that the MCU 15 retrieves the driving current values of each of the LED chips 11-13 from the flash memory 16 and gives the retrieved driving current values to an LED driver 14 by just applying a power-supply voltage to leads 21 and 22 of the light-emitting element 10. In this way, the light-emitting element 10 applies the driving currents to each of the LED chips 11-13 respectively in order to emit a light of a desired color.

Description

  The present invention relates to a light emitting element and a light emission color control system thereof, and more particularly to a light emitting element that adjusts a light emission color by simultaneously lighting a plurality of LEDs and a light emission color control system that adjusts a light emission color of the light emitting element.

  In recent years, blue LEDs (light emitting diodes) that emit blue light, which is one of the three primary colors of light, have been developed. Accordingly, the LED lamp in which each of the red (R), green (G), and blue (B) LED chips is sealed with a transparent resin adjusts the current value of the drive current supplied to each LED chip. Now, it is possible to emit light of any color within the color reproduction range.

  As such a conventional technique, Patent Document 1 discloses driving a plurality of light emitting dots and a plurality of light emitting dots, each of which is a red, green, and blue LED chip sealed with a transparent resin on a wiring board. An LED light source in which one LED driver is arranged is disclosed. The LED driver has a built-in nonvolatile memory in which a plurality of drive current values are written for each LED chip of each light emitting dot. For this reason, the LED driver selects an optimum current value from among the drive current values written in the nonvolatile memory for each LED chip, and supplies the drive current of the selected current value to each LED chip. As a result, the light emission colors of the respective light emission dots can be made uniform.

Further, Patent Document 2 discloses an LED that increases the current value of the drive current supplied to the LED by controlling the control unit when the emission intensity of the LED detected by the sensor is lower than the emission intensity written in the memory. A control device is disclosed. For this reason, even if LED deteriorates and the emitted light intensity becomes weak, LED can keep emitted light intensity constant.
JP 2006-237282 A JP 2006-128619 A

  In some cases, it is desired to adjust the color of light of each of the red, green, and blue LED chips included in the light emitting element so that the light emitting element emits light having a color approximate to a specific color. In this case, it is necessary to adjust the light emission intensities of the red, green, and blue LED chips to be the same as the light emission intensities of the red, green, and blue lights included in the specific color.

  However, since the LED light source of Patent Document 1 aims to align the colors of a plurality of light emitting dots, only one LED driver is arranged for the plurality of light emitting dots. For this reason, there is a problem that even if a power supply voltage is individually applied to each light emitting dot, each light emitting dot cannot emit light of a specific color.

  Also, only the drive current value corresponding to the emission intensity of the reference LED is written in the memory of the LED control device of Patent Document 2. For this reason, there exists a problem that the LED control apparatus cannot supply drive current corresponding to a specific color to LED.

  Therefore, an object of the present invention is to provide a light-emitting element that can emit light of a specific color when a power supply voltage is applied. Another object of the present invention is to provide a light emission color control system capable of changing the light emission color of such a light emitting element to a color approximate to the light emission color of a sample.

A first invention is a light-emitting element that adjusts the emission color by simultaneously lighting a plurality of LEDs,
A drive unit for supplying a drive current to each of the plurality of LEDs;
A nonvolatile memory for storing a value corresponding to the current value of the drive current;
A control unit that reads out a value corresponding to a current value of the drive current stored in the nonvolatile memory and applies the value to the drive unit;
Two leads for providing a DC power supply voltage to the drive unit, the nonvolatile memory, and the control unit;
When the DC power supply voltage is applied to the two leads, the control unit reads a value corresponding to the current value of the drive current from the nonvolatile memory to obtain a current value of the drive current, Giving the drive unit a current value of a drive current;
The driving unit supplies the driving current to each of the plurality of LEDs based on a current value of the driving current given from the control unit.

According to a second invention, in the first invention,
Each of the plurality of LEDs further comprises one lead to which a current value signal representing the current value of the driving current is given from the outside in a time division manner,
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit supplies a value corresponding to the current value of the drive current obtained from the current value signal given in a time division manner to the nonvolatile memory based on a control signal given to the one lead from the outside. It is characterized by storing.

According to a third invention, in the first invention,
In order to externally provide a current value signal representing the current value of the drive current to each of the plurality of LEDs, the LED further comprises a plurality of leads provided corresponding to the plurality of LEDs,
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit corresponds to a current value of the drive current obtained from the current value signal respectively given to the plurality of leads based on a control signal given to any of the plurality of leads from the outside. A value is stored in the nonvolatile memory.

4th invention is 2nd or 3rd invention,
The length of the one lead and the plurality of leads is shorter than the length of the two leads.

According to a fifth invention, in the first invention,
The current value signal, which is applied from the outside and superimposed on one of the DC power supply voltages supplied via the two leads, and represents the current value of the drive current, is separated from the DC power supply voltage, and the separated current value A distribution unit for supplying a signal to the control unit and supplying the separated DC power supply voltage to the drive unit, the nonvolatile memory, and the control unit;
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit supplies a value corresponding to the current value of the drive current obtained from the separated current value signal to the nonvolatile memory based on a control signal given to one of the two leads from the outside. It is characterized by storing.

According to a sixth invention, in the fifth invention,
The current value signal is superimposed on a negative DC power supply voltage of the DC power supply voltage.

According to a seventh invention, in the first invention,
An antenna for receiving a radio wave including a current value signal representing a current value of the drive current, which is transmitted from the outside;
A receiver that separates the current value signal from the radio wave received by the antenna, and that provides the separated current value signal to the control unit;
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit stores a value corresponding to the current value of the driving current obtained from the separated current value signal in the nonvolatile memory based on a control signal given from the outside via the antenna. Features.

According to an eighth invention, in any one of the second to seventh inventions,
The rewritable nonvolatile memory is a flash memory.

According to a ninth invention, in the first invention,
The nonvolatile memory is a non-rewritable memory.

In a tenth aspect based on the first aspect,
The plurality of LEDs are:
Including two red LEDs, one green LED, and one blue LED,
Two red LEDs are connected in series.

In an eleventh aspect of the invention, when a sample light source that emits light of a predetermined color, a light emitting element, and the sample light source and the light emitting element are mounted, the light emitting element emits light of a color that approximates the sample light source. A light emission color control system comprising a light emission intensity adjusting device,
The light emitting element is
A plurality of LEDs each emitting light of a plurality of colors;
A drive unit for supplying a drive current to each of the plurality of LEDs;
A rewritable nonvolatile memory that stores a value corresponding to a current value of a drive current supplied to each of the plurality of LEDs;
A value corresponding to the current value of the drive current stored in the nonvolatile memory is read and the current value of the drive current is given to the drive unit, or the current value of the drive current given from the light emission intensity adjusting device is A control unit that feeds the drive unit,
The drive unit, the nonvolatile memory, and two leads for applying a DC power supply voltage to the control unit,
The emission intensity adjusting device is
A first light receiving portion for receiving light from the sample light source;
First level detection means for detecting the light emission intensity level of the sample light source for each of the plurality of colors based on the output of the first light receiving unit;
Current value calculating means for obtaining a current value of a drive current of the plurality of LEDs based on the detected light emission intensity level for each of the plurality of colors;
A signal output unit that generates a current value signal representing the current value of the drive current based on the current value of the drive current obtained by the current value calculation means and outputs the current value signal to the light emitting element;
A second light receiving portion for receiving light from the light emitting element;
Second level detection means for detecting a level of light emission intensity of the LED for each of the plurality of colors based on an output of the second light receiving unit;
Comparison means for comparing the light emission intensity level of the sample light source and the light emission intensity level of the light emitting element for each of the plurality of colors;
As a result of comparison by the comparison means, when there is a color that does not match the corresponding emission intensity level of the sample light source among the emission intensity levels of the light emitting element, the emission intensity level of the light emitting element for the non-matching color Level adjusting means for adjusting the light emission intensity level of the light emitting element so that the light emission intensity level of the sample light source matches.
As a result of comparison by the comparison means, when the light emission intensity level of the light emitting element and the light emission intensity level of the sample light source match for each of the plurality of colors, a value corresponding to the current value of the drive current is Command output means for outputting a command to be stored in a non-volatile memory.

In a twelfth aspect based on the eleventh aspect,
The light emitting element further includes one lead for giving the current value signal to be supplied to each of the plurality of LEDs from the outside in a time division manner,
The signal output unit of the light emission intensity adjusting device outputs the current value signal in a time-sharing manner to the one lead of the light emitting element.

In a thirteenth aspect based on the eleventh aspect,
The light emitting element further includes a plurality of leads provided in correspondence with the plurality of LEDs in order to externally supply the current value signal to each of the plurality of LEDs.
The signal output unit of the light emission intensity adjusting device outputs the current value signal to each of the plurality of leads.

In a fourteenth aspect based on the eleventh aspect,
The light emitting device further includes a distribution unit that separates the current value signal applied from the outside from the DC power supply voltage by superimposing it on any of the DC power supply voltages applied via the two leads,
The signal output unit of the light emission intensity adjusting device further includes a superimposing unit that superimposes the current value signal on any of the DC power supply voltages and applies the superposed current value signal to the distributing unit.

In a fifteenth aspect based on the eleventh aspect,
The light emitting element is
An antenna for receiving radio waves including the current value signal transmitted from the outside;
A signal receiving unit that separates the current value signal from the radio wave received by the antenna and provides the separated current value signal to the control unit; It further includes a transmission unit that transmits a radio wave including a signal to the reception unit.

In a sixteenth aspect based on the eleventh aspect,
The emission intensity adjusting device is
A manual selector switch for switching from automatic mode to manual mode;
A selection switch for selecting one of the plurality of LEDs when switched to the manual mode by the manual switch;
A level-up switch that increases the level of light emission intensity of the selected LED;
And a level-down switch for decreasing a light emission intensity level of the selected LED.

In a seventeenth aspect based on the eleventh aspect,
The emission intensity adjusting device is
A first monitor for displaying a level of emission intensity for each of the plurality of colors of the sample light source;
And a second monitor for displaying a light emission intensity level for each of the plurality of colors of the light emitting element.

In an eleventh aspect based on the eleventh aspect,
The emission intensity adjusting device is
A first LED lamp that reproduces light of the sample light source based on a level of emission intensity for each of the plurality of colors of the sample light source;
And a second LED lamp that reproduces the light of the light emitting element based on the light emission intensity level of each of the plurality of colors of the light emitting element.

  According to the first aspect, in the light emitting element, a value corresponding to the current value of the drive current supplied to the plurality of LEDs is stored in the nonvolatile memory. When a DC power supply voltage is applied to the two leads, the control unit reads a value corresponding to the current value of the drive current stored in the nonvolatile memory to obtain a current value, and the obtained current value is supplied to the drive unit. give. As a result, a drive current is supplied to each of the plurality of LEDs. In this manner, the light emitting element can emit light of a specific color based on a value corresponding to the drive current value stored in the nonvolatile memory when a DC power supply voltage is applied.

  According to the second aspect of the invention, in addition to the two leads for applying the DC power supply voltage, the light emitting element receives a current value signal representing the current value of the drive current supplied to the plurality of LEDs from the outside in a time-sharing manner. It further comprises one lead to be provided. In this case, if a control signal is given from the outside to the control unit, a value corresponding to the current value of the drive current obtained based on the current value signal is stored in the nonvolatile memory, so that the emission color of the light emitting element Can be easily changed to a specific color. Further, since the current value signal is supplied through one lead provided separately from the two leads for supplying the DC power supply voltage, the processing load on the control unit can be reduced.

  According to the third aspect of the invention, the light emitting element includes a plurality of leads provided corresponding to each of the plurality of LEDs in addition to the two leads for applying the DC power supply voltage. A current value signal representing the current value of the drive currents of the plurality of LEDs is given from the outside through the respective leads. In this case, if a control signal is given from the outside to the control unit, a value corresponding to the current value of the drive current obtained based on the current value signal is stored in the nonvolatile memory, so that the emission color of the light emitting element Can be easily changed to a specific color. In addition, since the current value signal is supplied through three leads provided separately from the two leads that supply the DC power supply voltage, the processing load on the control unit can be further reduced.

  According to the fourth aspect of the invention, the lengths of one lead and a plurality of leads that give a current value signal to the control unit from the outside are both shorter than the lengths of the two leads that give a DC power supply voltage. When the light emitting element is mounted on the printed circuit board, the lead for supplying the current value signal does not get in the way. For this reason, it becomes easy to mount a light emitting element on a printed circuit board.

  According to the fifth aspect of the present invention, when a current value signal representing the current value of the LED driving current is applied to one of the two leads for supplying the DC power supply voltage, superimposed on the DC power supply voltage, from the outside. The current value signal is separated by the distributor. In this case, if a control signal is given from the outside to the control unit, a value corresponding to the current value of the drive current obtained based on the current value signal is stored in the nonvolatile memory. For this reason, since it is not necessary to newly provide a lead in addition to the two leads for applying the DC power supply voltage, the light emitting element can be easily replaced with a conventional light emitting element.

  According to the sixth aspect of the present invention, since the current value signal is superimposed on the negative DC power supply voltage, the negative DC current is often used as a reference voltage for the control unit, drive unit, and nonvolatile memory. Matching with the power supply voltage can be achieved.

  According to the seventh aspect, when a radio wave including a current value signal representing the current value of the LED drive current is transmitted from the outside, the transmitted radio wave is received by the antenna. Then, the current value signal is separated from the received radio wave by the receiving unit. In this case, if a control signal is given from the outside to the control unit, a value corresponding to the current value of the drive current obtained based on the current value signal is stored in the nonvolatile memory. Therefore, the value corresponding to the current value of the drive current stored in the nonvolatile memory with the light emitting element mounted on the substrate is rewritten, or the current value of the drive current stored in the nonvolatile memory of the plurality of light emitting elements The value corresponding to can be rewritten at the same time.

  According to the eighth aspect, since the nonvolatile memory is a flash memory, the current value of the drive current can be easily rewritten any number of times.

  According to the ninth aspect, since the nonvolatile memory is a memory that cannot be rewritten, it is less expensive than a rewritable memory, and the manufacturing cost of the light emitting element can be suppressed.

  According to the tenth aspect of the invention, two red LEDs are included among the plurality of LEDs, and they are connected in series. For this reason, a red LED having a withstand voltage of about ½ that of the green and blue LEDs can be handled in the same manner as the green and blue LEDs. Further, by making red light as bright as green and blue light, it is possible to brighten the light of the light emitting element in which they are mixed.

  According to the eleventh aspect of the invention, the light emission intensity adjusting device detects the light emission intensity level of the sample light source for each of a plurality of colors, and generates a drive current having a current value corresponding to the light emission intensity level of the sample light source. Supply to multiple LEDs. Then, the light emission intensity level of the light emitting element is detected for each color and compared with the light emission intensity level of the sample light source. As a result, when there is a color that does not match the two levels, the light emission intensity level of the LED of the light emitting element corresponding to the color that does not match is adjusted. When the light emission intensity levels of the two colors coincide with each other, the light emission intensity adjustment device stores a value corresponding to the current value of the drive current corresponding to the matched level in the rewritable nonvolatile memory of the light emitting element. . In this way, the light emission intensity adjusting device can cause the light emitting element to emit light having a color similar to that of the sample light source. Further, when a direct-current power supply voltage is applied, the light emitting element can read the current value of the drive current stored in the nonvolatile memory and emit light having a color similar to that of the sample light source.

  According to the twelfth aspect of the present invention, the light emission intensity adjusting device applies the current value signal representing the current value of the driving current of each LED to the light emitting element on one lead provided in the light emitting element. For this reason, the level of the light emission intensity of a plurality of LEDs can be easily adjusted.

  According to the thirteenth aspect, the light emission intensity adjusting device gives a current value signal representing the current value of the drive current of each LED to the plurality of leads provided in the light emitting element. For this reason, the level of the light emission intensity of the plurality of LEDs can be more easily adjusted.

  According to the fourteenth aspect of the present invention, the light emission intensity adjustment device superimposes a current value signal representing the current values of the drive currents of the plurality of LEDs on any one of the DC power supply voltages, and provides the light emission element. For this reason, the light emitting element is used in place of a conventional light emitting element having only two leads.

  According to the fifteenth aspect, the light emission intensity adjusting device transmits a radio wave including a current value signal representing a current value of a drive current of the plurality of LEDs to the light emitting element. Therefore, a current value signal can be applied to a light emitting element to which no power supply voltage is applied, a light emitting element mounted on a printed circuit board, or a current value signal can be simultaneously applied to a plurality of light emitting elements.

  According to the sixteenth aspect, the light emission intensity adjusting device is switched from the automatic mode to the manual mode by turning on the manual changeover switch, and the operator increases or decreases the light emission intensity level for each of the plurality of LEDs of the light emitting element. Can be made. Therefore, after the light emission intensity level of the sample light source and the light emission intensity level of the light emitting element are automatically adjusted by the light emission intensity adjusting device, the operator manually adjusts the light emission intensity level for each of the plurality of LEDs. be able to.

  According to the seventeenth aspect of the invention, the emission intensity adjusting device includes a first monitor that indicates the emission intensity level of the sample light source for each of a plurality of colors, and a first monitor that indicates the emission intensity level of the light emitting element for each of a plurality of colors. 2 monitors. For this reason, the operator can confirm the difference in the level of the light emission intensity between the two by comparing the numbers displayed on the first and second monitors.

  According to the eighteenth aspect of the invention, the emission intensity adjusting device includes the first LED lamp that reproduces the light of the sample light source and the second LED lamp that reproduces the light of the light emitting element. For this reason, the operator can discriminate a subtle difference between the emission colors of the two by comparing the light of the first LED lamp and the light of the second LED lamp. In this case, the operator can easily adjust the light emission intensity manually.

<1. First Embodiment>
<1.1 Light-emitting element and its operation>
FIG. 1 is a block diagram showing a configuration of a light emitting device 10 according to the first embodiment of the present invention. The light emitting element 10 shown in FIG. 1 includes a red LED chip 11, a green LED chip 12, a blue LED chip 13, an LED driver 14, an MCU (Micro Controller Unit) 15, and a flash memory 16, and the MCU 15 includes a register 15a. They are sealed inside a shell-shaped sealing resin member 20 made of a transparent resin.

  Three leads 21, 22, and 23 extend from the sealing resin member 20 to the outside. A positive DC voltage is applied to the lead 21, and a negative DC voltage is applied to the lead 22. The positive and negative (hereinafter referred to as “0 V” in this specification) DC voltages applied to the leads 21 and 22 are applied to the LED driver 14, MCU 15 and flash memory 16 as power supply voltages. In addition, the lead 23 has a pulse signal Sr, Sg, Sb (hereinafter, referred to as “pulse signal” in this specification) representing a current value of a drive current supplied to each of the LED chips 11 to 13. Given in divisions.

  The operation mode of the light emitting element 10 has the following three modes. That is, when a power supply voltage is applied, a first operation mode for reading the drive current value written in the flash memory 16 and supplying the read drive current to the LED chips 11 to 13 is given from the outside. Second operation mode for supplying a drive current having a current value to each of the LED chips 11 to 13 and a third operation mode for writing the drive current value of each of the LED chips 11 to 13 supplied from the outside to the flash memory 16 There is. These operation modes are switched by a rewrite prohibition instruction that prohibits rewriting of the drive current value to the flash memory 16. Specifically, when the rewrite prohibition instruction is given, the first operation mode is entered, and when the rewrite prohibition instruction is released, the second operation mode is entered. After the rewrite prohibition instruction is released, the flash memory 16 is further rewritten. When an instruction is given, the mode is switched to the third operation mode.

  In the first operation mode, the drive current values of the LED chips 11 to 13 are written in the flash memory 16 in advance. For this reason, when the power supply voltage is applied to the leads 21 and 22 of the light emitting element 10, the MCU 15 reads the drive current values of the LED chips 11 to 13 from the flash memory 16, and sends the read drive current values to the LED driver 14. give. In this manner, when the power supply voltage is applied, the light emitting element 10 supplies the drive current to each LED chip 11 to 13 based on the current value written in the flash memory 16 for each LED chip 11 to 13. Since it supplies, the light of the color approximated to the specific color can be emitted. Note that the emission color of the light-emitting element 10 is not the same color as the specific color but is an approximate color because the specific color includes not only red, green and blue, but also other color components. On the other hand, the emission color of the light emitting element 10 includes only red, green and blue components.

  In the second operation mode, the MCU 15 converts the pulse signals Sr, Sg, and Sb that are given in a time division manner to the LED chips 11 to 13 through the lead 23 from the outside into drive current values for each color component, and converts them. The current value is given to the LED driver 14. As shown in FIG. 2, the LED driver 14 supplies a drive current having a given current value to each of the LED chips 11 to 13. Thus, since each LED chip 11-13 emits light having an intensity corresponding to each of the pulse signals Sr, Sg, Sb, the light emitting element 10 can emit light having a color approximate to a specific color.

  In the third operation mode, the light emitting element 10 receives an instruction to write the drive current value to the flash memory 16 in a state where the drive current value for each of the LED chips 11 to 13 supplied from the outside to the MCU 15 is held in the register 15a. When given from the outside, the drive current values of the LED chips 11 to 13 held in the register 15 a are written into the flash memory 16. In this way, when the drive current values of the LED chips 11 to 13 are written in the flash memory 16, the light emitting element 10 can be obtained by simply applying the power supply voltage to the leads 21 and 22 of the light emitting element 10. Light can be emitted in one operation mode.

  The current value of the drive current written in the flash memory 16 is given so as to correspond to 100 levels from the lowest level 0 to the highest level 99 where the light emission intensity of each LED chip 11 to 13 is weakest. Therefore, the light emitting element 10 combines all the light emission intensity levels of the LED chips 11 to 13 so that the red, green, and blue LED chips 11 to 13 have all the light emission intensities from the black level 0 to the level 99. It can emit 1 million colors of light up to a certain white color.

  The light emitting element 10 is provided with a dedicated lead 23 for giving a drive current value to the MCU 15 from the outside. For this reason, the drive current value of each LED chip 11-13 is given to MCU15 via the lead | read | reed 23 different from the leads 21 and 22 which supply a power supply voltage, and is hold | maintained at the register | resistor 15a. In this way, the current value of the drive current is provided through the lead 23 provided separately from the two leads 21 and 22 that provide the DC power supply voltage, so that the processing load on the MCU 15 is further reduced.

  When it is desired to change the color of light emitted from the light emitting element 10, the flash memory 16 is provided with an instruction to cancel the rewrite prohibition of the drive current value written in the flash memory 16 to the MCU 15 from the outside via the lead 23. It becomes a rewritable state. Next, when a drive current value rewrite command is given to the MCU 15 via the lead 23, the MCU 15 uses the drive current value held in the register 15 a instead of the drive current value written in the flash memory 16. Write to the flash memory 16. When the writing of the drive current value is completed, a rewrite prohibition instruction is given to the MCU 15 via the lead 23 in order to prevent the drive current value from being rewritten again. As a result, rewriting of the drive current value written in the flash memory 16 is prohibited.

  The light emission intensity level of the light emitting element 10 is not limited to 0 to 99, and may be 1 to 100, 0 to 128, or the like. Further, the memory for writing the current value of the drive current of each LED chip 11 to 13 is not limited to the flash memory 16, and for example, a ferroelectric memory (FeRAM), a magnetoresistive memory (MRAM), a resistance memory (ReRAM), etc. It may be a non-volatile memory.

  FIG. 3 is an exploded perspective view showing the mounting substrate 30 sealed inside the sealing resin member 20 of the light emitting element. The mounting substrate 30 is formed by laminating two substrates 31 and 32, and each of the red LED chip 11, the green LED chip 12, and the blue LED chip 13 is mounted on the upper substrate 31. The LED driver 14, MCU 15, and flash memory 16 are mounted on the lower substrate 32 in the form of an IC (Integrated Circuit). Three leads 21, 22, and 23 are connected to the lower substrate 32, and the drive current values of the LED chips 11 to 13 are connected to the MCU 15 via the leads 23 as pulse signals Sr, Sg, and Sb. The positive and negative DC voltages are applied via leads 21 and 22, respectively.

  In the above description, it has been described that what is written in the flash memory 16 is the current value of the drive current of each LED chip 11 to 13, but corresponds to the current value of the drive current, such as the light emission intensity level, for example. It may be a value. In addition, the leads 21 and 22 need a certain length in order to easily connect to the wiring on the printed board, but the lead 23 does not need to be connected to the wiring. It is preferable that the length is shorter than the leads 21 and 22 so as not to interfere with the mounting. Further, the case where the red, green, and blue LED chips 11 to 13 are mounted on the upper substrate 31 and the LED driver 14, the MCU 15 and the flash memory 16 are mounted on the lower substrate 32 has been described. They may all be mounted on top, or may be mounted separately on three or more substrates. Further, although different ICs are used as the LED driver 14, MCU 15, and flash memory 16, ICs in which these are integrated into one may be used.

<1.2 Configuration and operation of emission color control system>
FIG. 4 is a block diagram illustrating a configuration of a light emission color control system including a light emission intensity adjustment device 40 that adjusts the light emission color of the light emitting element 10. For example, if the sample light source 80 that emits light of a desired color and the light-emitting element 10 are mounted directly below the sample-side sensor 41 and the clone-side sensor 52, respectively, the light-emission intensity adjusting apparatus 40 In this device, the drive current values of the LED chips 11 to 13 are written in the flash memory 16 built in the light emitting element 10 so as to emit light having a color similar to that of the light source 80.

  4 includes a sample side sensor 41, a sample side frequency conversion circuit 42, an MCU 43, a pulse generation circuit 45, a power supply circuit 50, a power plug 51, a clone side sensor 52, a clone side frequency conversion circuit 53, A sample side monitor 71, a sample side LED lamp 72, a clone side monitor 73, a clone side LED lamp 74, an automatic / manual switching unit 61, an intensity adjustment unit 62, an automatic display lamp 75, and a manual display lamp 76 are provided. Built in.

  The operation of the light emission intensity adjusting device 40 will be described. When the sample light source 80 and the light emitting element 10 are mounted on the light emission intensity adjusting device 40, the sample side sensor 41 is a photodiode array (not shown) provided with red, blue and green filters for the light from the sample light source 80, respectively. The received light is converted into a current corresponding to the emission intensity for each color component, and the converted current is supplied to the sample-side frequency conversion circuit 42. The sample-side frequency conversion circuit 42 converts the applied current into a PWM (Pulse Width Modulation) signal having a frequency corresponding to the color component and a duty ratio corresponding to the light emission intensity for each color component, and supplies the converted signal to the MCU 43.

  Based on the duty ratio of the given PWM signal, the MCU 43 determines which level of the light emission intensity corresponds to 0 to 99 for each color component. Then, the obtained level is displayed on the sample side monitor 71, and the drive current value of each LED chip (not shown) in the sample side LED lamp 72 is obtained to supply the current, thereby turning on the sample side LED lamp 72. Let

  Then, the MCU 43 time-divides the PWM signal for each color component and supplies the PWM signal to the pulse generation circuit 45. The pulse generation circuit 45 generates pulse signals Sr, Sg, Sb representing drive current values of the LED chips 11 to 13 based on the given PWM signal, and time-divides the generated pulse signals Sr, Sg, Sb. To the lead 23 of the light emitting element 10.

  As a result, as described above, the light emitting element 10 emits light of a color corresponding to the pulse signals Sr, Sg, Sb given from the light emission intensity adjusting device 40, and the clone-side sensor 52 emits light from the light emitting element. Receive light. Similar to the sample side sensor 41, the clone side sensor 52 receives light from the light emitting element 10 by a photodiode array (not shown) provided with red, blue, and green filters. These filters are filters having the same transmission characteristics as the filter of the sample side sensor 41. Therefore, light having the same frequency as that of the corresponding photodiode array of the sample side sensor 41 is incident on the photodiode array that receives the light of each color component of the clone side sensor 52.

  The clone side sensor 52 receives light emitted from the light emitting element 10 by a photodiode array provided with red, blue, and green filters, and converts the light into a current corresponding to the light emission intensity for each color component of the received light. To the clone-side frequency conversion circuit 53. The clone-side frequency conversion circuit 53 converts the applied current into a PWM signal having a frequency corresponding to the color component and a duty ratio corresponding to the light emission intensity for each color component, and supplies the converted PWM signal to the MCU 43.

  Based on the duty ratio of the PWM signal for each color component given from the clone-side frequency conversion circuit 53, the MCU 43 determines which level of the light emission intensity corresponds to 0 to 99 for each color component. Then, the obtained level is displayed on the clone-side monitor 73, the drive current value of each LED chip (not shown) in the clone-side LED lamp 74 is obtained, and the clone-side LED lamp 74 is turned on.

  The MCU 43 compares the light emission intensity level of the sample light source 80 and the light emission intensity level of the light emitting element 10 for each color component, and when the light emission intensity levels of the two are different, the light emission intensity level of the light emitting element 10 is The duty ratio of the PWM signal of the light emitting element 10 is adjusted by increasing / decreasing so that it matches the level of the light emission intensity of the sample light source 80. The detailed adjustment method will be described later.

  Then, the MCU 43 gives the PWM signal whose duty ratio has been adjusted to the pulse generation circuit 45 again. The pulse generation circuit 45 generates the pulse signals Sr, Sg, Sb representing the drive current value again based on the applied PWM signal, and supplies the generated pulse signals Sr, Sg, Sb to the lead 23 of the light emitting element 10.

  In this manner, the duty ratio of the PWM signal obtained based on the light from the light emitting element 10 is increased or decreased until the light emission intensity level of the sample light source 80 matches the light emission intensity level of the light emitting element 10 for all color components. By doing so, the level of the light emission intensity of both is made to coincide.

  As described above, the emission intensity adjusting device 40 displays the emission intensity level for each emission color of the sample light source 80 and the emission intensity levels for the LED chips 11 to 13 of the light emitting element 10 at a level of 0 to 99. A sample side monitor 71 and a clone side monitor 73 are provided. Therefore, the operator can directly compare the light emission intensity levels by comparing the numbers displayed on the sample side monitor 71 and the clone side monitor 73. For example, the sample-side monitor 71 and the clone-side monitor 73 shown in FIG. 4 display the case where red is level 15, green is level 33, and blue is level 71.

  In addition, even when the emission intensity levels displayed on the sample-side monitor 71 and the clone-side monitor 73 are all the same, the operator can change the light color of the sample-side LED lamp 72 and the clone-side LED lamp 74. By comparing with the color of the light, it is also possible to distinguish the difference in emission color between the two, which does not appear in the numbers displayed on the sample side monitor 71 and the clone side monitor 73. Therefore, the operator can manually increase or decrease the light emission intensity level of the light emitting element 10 from the automatically adjusted value.

  Next, a case where the light emission intensity level of the light emitting element 10 is manually adjusted will be described. The MCU 43 of the light emission intensity adjusting device 40 is provided with an automatic / manual switching unit 61 and an intensity adjusting unit 62. The automatic / manual switching unit 61 is provided with an automatic switch SW1 and a manual switch SW2. When the automatic switch SW1 is turned on, the light emission intensity adjusting device 40 enters the automatic mode, and the PWM signal of the light emitting element 10 is set so that the light emission intensity level of the light emitting element 10 matches the light emission intensity level of the sample light source 80. The duty ratio is automatically increased or decreased for adjustment.

  On the other hand, if the manual switch SW2 is turned on, the light emission intensity adjusting device 40 enters the manual mode. Therefore, the operator operates the intensity adjusting unit 62 described later to set the duty ratio of the PWM signal of the light emitting element 10 so that the light emission intensity level of the light emitting element 10 matches the light emission intensity level of the sample light source 80. Increase or decrease the adjustment. If the manual switch SW2 is turned on again in the manual mode, the light emission intensity adjusting device 40 returns to the automatic mode. Since the automatic display lamp 75 is lit when the emission intensity adjusting device 40 is in the automatic mode and the manual display lamp 76 is lit when in the manual mode, the operator can easily confirm whether the automatic mode or the manual mode is selected. Can do.

  The intensity adjustment unit 62 is provided with a selection switch SW3, a level up switch SW4, and a level down switch SW5. The selection switch SW3 is a switch for selecting the LED chip whose light emission intensity level is to be adjusted among the LED chips 11 to 13, and each time the LED chip is turned on, the red, green, and blue LED chips 11 to 13 are sequentially cycled. Select The level up switch SW4 increases the light emission intensity level by 1 each time it is turned on, and the level down switch SW5 decreases the light emission intensity level by 1 each time it is turned on.

  The memory 43a in the MCU 43 is a rewritable memory for storing a program for controlling the above-described various operations of the MCU 43. Further, the power supply circuit 50 rectifies the AC voltage supplied from the power plug 51 into a DC voltage, and supplies the rectified DC voltage to the leads 21 and 22 of the light emitting element 10 as the power supply voltage.

  5 to 7 are flowcharts showing a process in which the MCU 43 of the light emission intensity adjusting device 40 writes the drive current values of the LED chips 11 to 13 in the flash memory 16 built in the light emitting element 10. As shown in FIGS. 5 to 7, first, an instruction is issued to the MCU 15 of the light-emitting element 10 to cancel the rewrite prohibition of the drive current values of the LED chips 11 to 13 written in the flash memory 16 (step S1). .

  Next, the light from the sample light source 80 is received by the sample side sensor 41 and converted into a current. The converted current is further converted by the sample side frequency conversion circuit 42 into a predetermined frequency and duty for each of the red, green, and blue color components. Convert to ratio PWM signal. Therefore, the light emission intensity level of each color component of the sample light source 80 is obtained from the duty ratio of the PWM signal (step S2). At this time, the obtained red, green, and blue emission intensities are displayed on the sample-side monitor 71, and the sample-side LED lamp 72 emits light with a driving current corresponding to the obtained emission intensity level.

  Each LED chip 11-13 has a drive current value such that the light emission intensity level for each color component of the light emitting element 10 set on the clone side is the same as the light emission intensity level for each color component of the sample light source 80. And given to the MCU 15 of the light emitting element 10 (step S3). As a result, the MCU 15 of the light emitting element 10 gives the drive current value to the LED driver 14 so that the drive current is supplied to the LED chips 11 to 13.

  The light of the light emitting element 10 is received by the clone side sensor 52 and converted into a current, and the converted current is further converted into a PWM signal for each of red, green and blue color components by the clone side frequency conversion circuit 42. Therefore, the light emission intensity level of each color component of the light emitting element 10 is obtained from the duty ratio of the PWM signal (step S4). At this time, the obtained red, green, and blue emission intensities are displayed on the clone-side monitor 73, and the clone-side LED lamp 74 emits light with a driving current corresponding to the obtained emission intensity.

  The light emission intensity level of the sample light source 80 and the light emission intensity level of the light emitting element 10 are compared for each color component, and it is determined whether or not the light emission intensity level of both is the same value for each color component (step S5). When the result of the determination in step S5 is negative, that is, when the emission intensity level of at least some of the color components is different from the emission intensity level of the sample light source 80 and the emission intensity level of the light emitting element 10. First, it is determined whether or not the red emission intensity levels of both are the same value (step S6).

  If it is determined in step S6 that the red light emission intensity levels are the same, the process proceeds to step S8 described later. On the other hand, when it is determined in step S6 that the red light emission intensity levels are different from each other, the duty ratio of the PWM signal generated based on the red light from the light emitting element 10 is increased or decreased. Thus, the level of the red emission intensity of the light emitting element 10 is adjusted (step S7), and the process proceeds to step S8.

  Next, in step S8, it is determined whether or not the green light emission intensity levels are the same. As a result, if it is determined that the green light emission intensity levels are the same, the process proceeds to step S10 described later. On the other hand, if it is determined in step S8 that the levels of the green light emission intensity of the two are different values, the duty ratio of the PWM signal generated based on the green light from the light emitting element 10 is increased or decreased. Thus, the level of the green light emission intensity of the light emitting element 10 is adjusted (step S9), and the process proceeds to step S10.

  Next, in step S10, it is determined whether or not the blue light emission intensity levels are the same. As a result, when it is determined that the blue light emission intensity levels are the same, the process proceeds to step S12. On the other hand, if it is determined in step S10 that the blue light emission intensity levels are different from each other, the duty ratio of the PWM signal generated based on the blue light from the light emitting element 10 is increased or decreased. Thus, the level of the blue light emission intensity of the light emitting element 10 is adjusted (step S11), and the process proceeds to step S12.

  In step S12, a drive current value corresponding to the light emission intensity level adjusted in steps S7, S9, and S11 is obtained, the obtained drive current value is given to the pulse generation circuit 45, and the process returns to step S4. The pulse generation circuit 45 generates pulse signals Sr, Sg, Sb based on the given drive current value and supplies the pulse signals Sr, Sg, Sb to the MCU 15 of the light emitting element 10. At this time, the adjusted red, green, and blue emission intensity levels are displayed on the clone-side monitor 73, and the clone-side LED lamp 74 emits light with a drive current corresponding to the adjusted emission intensity level. .

  Next, it is determined whether or not the manual switch SW2 is turned on by the operator (step S13). As a result, when the manual switch SW2 is turned on and it is determined that the manual mode is set, the switches SW3 to SW5 of the intensity adjusting unit 62 are enabled and switched to the manual mode (step S14). When the light emission intensity adjusting device 40 is switched to the manual mode, the manual display lamp 76 is turned on, and the operator operates the selection switch SW3 to select the LED chip whose light emission intensity level is to be changed. Then, by operating the level up switch SW4 or the level down switch SW5, the light emission intensity level of the selected LED chip can be increased or decreased to adjust the light emission intensity level. The operator can adjust the light emission intensity level while confirming the color of the light emitted from the light emitting element 10 with the clone-side LED lamp 74.

  In step S15, the operator waits until the manual switch SW2 is turned on again to cancel the manual mode. Therefore, the operator can change the light emission intensity level until the manual switch SW2 is turned on again. If the manual switch SW2 is turned on by the operator, the automatic display lamp 75 is turned on and the manual mode is canceled, and the process proceeds to step S17. At this time, the level of the light emission intensity of the light emitting element 10 is a level adjusted in the manual mode.

  On the other hand, if it is determined in step S13 that the manual switch SW2 is not turned on by the operator, it is determined whether or not a predetermined time has elapsed (step S16). As a result, when it is determined that the predetermined time has not yet elapsed, the operator may turn on the manual switch SW2 in order to manually adjust the light emission intensity level, and the process returns to step S13.

  On the other hand, if the manual switch SW2 is not turned on within the predetermined time, the MCU 43 determines that the operator does not adjust the light emission intensity level, and proceeds to step S17. At this time, the light emission intensity level of the light emitting element 10 is a level adjusted in the automatic mode.

  The drive current value of each LED chip 11-13 according to the light emission intensity level of the light emitting element 10 obtained in step S15 or step S16 is given to the pulse generation circuit 45 (step 17). The pulse generation circuit generates pulse signals Sr, Sg, and Sb based on the given drive current value, and supplies them to the MCU 15 of the light emitting element 10. At this time, the adjusted red, green, and blue emission intensity levels are displayed on the clone-side monitor 73, and the clone-side LED lamp 74 emits light with a drive current corresponding to the adjusted emission intensity.

  Next, a command to write a drive current value to the flash memory 16 is given to the MCU 15 of the light emitting element 10 (step S18). Next, a command for prohibiting rewriting of the drive current values of the LED chips 11 to 13 written in the flash memory 16 is given (step S19). As a result, the drive current values of the LED chips 11 to 13 are written in the flash memory 16 of the light emitting element 10.

  In this way, the light emission intensity adjusting device 40 allows each LED chip 11 to 11 to be stored in the flash memory 16 built in the light emitting element 10 so that the light emitting element 10 can emit light having a color similar to that of the sample light source 80. Thirteen drive current values can be written. When the power supply voltage is applied to the leads 21 and 22, the light emitting element 10 in which the drive current values of the LED chips 11 to 13 are written is applied to the LED chips 11 to 13 written in the flash memory 16. Can be emitted to the LED driver 14 to emit light of a color similar to that of the sample light source 80.

  The MCU 43 serves as a first level output unit in step S2, a current value calculation unit in steps S3 and S17, a second level output unit in step S4, and a comparison unit in step S5. It functions as level adjusting means in S7, S9, and S11, and as command output means in step S18.

  Furthermore, although the pulse signals Sr, Sg, Sb are signals representing drive current values, they may be signals representing values corresponding to the drive current values, such as light emission intensity levels. Further, although the pulse signals Sr, Sg, and Sb have been described as pulse signals including rectangular waves, pulse signals other than rectangular waves, AC signals, or digital signals may be used.

<1.3 Modification>
FIG. 8 is a block diagram illustrating a configuration of a light emitting device 110 according to a modification of the first embodiment. Among the components of the light emitting device 110 according to this modification, the same or corresponding components as those of the light emitting device 10 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the light emitting element 110 shown in FIG. 8, unlike the light emitting element 10, the pulse signals Sr, Sg, Sb representing the drive current values of the LED chips 11 to 13 are not given in a time division manner but are given simultaneously. For this reason, the light emitting element 110 has the respective pulse signals Sr, Sg, Sb representing the drive current values of the red, green, and blue LED chips 11 to 13 in addition to the two leads 21 and 22 to which the power supply voltage is applied. Are provided with three dedicated leads 124 to 126 for supplying the signal to the MCU 15. Therefore, a total of five leads are provided in the light emitting element 110 including the two leads 21 and 22 to which the power supply voltage is applied. When the three pulse signals Sr, Sg, Sb respectively given from the three leads 124 to 126 are given to the MCU 15, the MCU 15 converts the three pulse signals Sr, Sg, Sb into drive current values, respectively. The converted drive current value is given to the LED driver 14. Thus, by providing the three leads 124 to 126, the processing load on the MCU 15 can be reduced. Note that a command for canceling the rewrite prohibition of the drive current value written in the flash memory 16, a rewrite command, and a rewrite prohibition command are externally given to the MCU 15 via any one of the three leads 124 to 126.

  FIG. 9 is an exploded perspective view showing the mounting substrate 130 sealed inside the sealing resin member 20 of the light emitting element 110. The mounting substrate 130 shown in FIG. 9 is different from the mounting substrate 30 according to the first embodiment in that five leads 21, 22, 124 to 126 are provided on the lower substrate 132. Of these, the three leads 124 to 126 are dedicated as described above, which are used for supplying the MCU 15 with pulse signals Sr, Sg, and Sb representing the drive current values of the LED chips 11 to 13 from the outside. Lead.

  The leads 21 and 22 need a certain length in order to be easily connected to the wiring on the printed board. However, since the leads 124 to 126 do not need to be connected to the wiring, it is preferable that the leads 124 to 126 have a shorter length than the leads 21 and 22 so that they do not get in the way when the light emitting element 10 is mounted on the printed board.

  FIG. 10 is a block diagram illustrating a configuration of a light emission color control system including a light emission intensity adjustment device 140 that adjusts the color of light of the light emitting element 110. As shown in FIG. 10, the emission intensity adjusting device 140 is the same as that of the first embodiment in that pulse signals Sr, Sg, and Sb are respectively given from the pulse generation circuit 45 to the leads 124 to 126 of the light emitting element 110. Although it is different from the light emission intensity adjusting device 40, other components are the same. Therefore, among the components of the light emission intensity adjustment device 140, the same or corresponding components as those of the light emission intensity adjustment device 40 are denoted by the same reference numerals and description thereof is omitted.

  When the PWM signal representing the drive current value of each LED chip 11 to 13 is supplied from the MCU 43 to the pulse generation circuit 45 in the light emission intensity adjusting device 140, the pulse generation circuit 45 outputs a pulse signal based on the supplied PWM drive signal. Sr, Sg, and Sb are generated. The generated pulse signals Sr, Sg, and Sb are applied to the MCU 15 of the light emitting element 110 via leads 124 to 126, respectively. As described above, the light emission intensity adjusting device 140 does not need to apply the pulse signals Sr, Sg, and Sb to the light emitting element 110 in a time division manner, so that the processing load on the MCU 43 can be reduced.

  The process of writing the drive current values of the LED chips 11 to 13 to the flash memory 16 built in the light emitting element 110 is performed by the light emission intensity adjusting device 40 according to the first embodiment. Compared with the process of writing the drive current values of 11 to 13, the following points are different. That is, in step S3 of FIG. 5 and step S17 of FIG. 7, when the obtained LED chip drive current value is given to the light emitting element 110 as the pulse signals Sr, Sg, Sb, it is given in time division via the lead 23. Rather, it is different in that it is given through leads 124 to 126 provided for the LED chips 11 to 13, respectively. However, since the other steps are the same, the description of the flowchart and other steps is omitted in this embodiment.

<2. Second Embodiment>
<2.1 Light-emitting element and its operation>
FIG. 11 is a block diagram showing a configuration of a light emitting device 210 according to the second embodiment of the present invention. Among the constituent elements of the light emitting element 210 according to the present embodiment, constituent elements that are the same as or correspond to those of the light emitting element 10 according to the first embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  In the light emitting element 210 shown in FIG. 11, unlike the light emitting element 10, only two leads 21 and 22 extend from the sealing resin member 20. A positive DC voltage, which is a power supply voltage, is applied to the lead 21 from the outside. The lead 22 is applied with a negative DC voltage as a power supply voltage from the outside, and the drive current values of the LED chips 11 to 13 are superimposed on the negative DC voltage to generate pulse signals Sr, Sg, Given as Sb.

  The positive DC voltage applied to the lead 21 is applied to the LED driver 14, MCU 15 and flash memory 16. The minus side DC voltage applied to the lead 22 and the pulse signals Sr, Sg, Sb superimposed thereon are separated into the minus side DC voltage and the pulse signals Sr, Sg, Sb by the distribution circuit 217. The separated negative DC voltage is supplied to the LED driver 14, the MCU 15 and the flash memory 16, and the pulse signals Sr, Sg, Sb are supplied to the MCU 15.

  The MCU 15 obtains the drive current values of the LED chips 11 to 13 based on the given pulse signals Sr, Sg, Sb in the same manner as the light emitting element 10 according to the first embodiment, and obtains the obtained drive current values. This is given to the LED driver 14. Further, the MCU 15 writes the drive current values of the LED chips 11 to 13 given to the MCU 15 to the flash memory 16 or prohibits writing based on a command given from the outside while being superimposed on the negative DC voltage. Or cancel the write protection.

  Thus, unlike the case of the light emitting element 10 according to the first embodiment, the light emitting element 210 is dedicated for providing the pulse signals Sr, Sg, Sb representing the drive current values of the LED chips 11 to 13. Since there is no need to provide separate leads, the number of leads is only two as in the conventional light emitting device. For this reason, the light emitting element 210 can be replaced with a conventional light emitting element and mounted without changing the wiring of the printed circuit board.

  FIG. 12 is an exploded perspective view showing the mounting substrate 230 sealed inside the sealing resin member 20 of the light emitting element 210. Of the components of the mounting substrate 230 shown in FIG. 12, the same or corresponding components as those of the mounting substrate 30 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Unlike the mounting substrate 30, the lower substrate 232 of the mounting substrate 230 is provided with only two leads 21 and 22 for applying a power supply voltage, and the lower substrate 232 includes an LED driver. 14, in addition to the MCU 15 and the flash memory 16, a distribution circuit 217 is further provided.

  In addition, since the connection relationship between each LED chip 11-13 of red, green, and blue in the light emitting element 210 and the LED driver 14 is the same as that of the light emitting element 10 shown in FIG. 2, a circuit diagram and its description are omitted.

<2.2 Configuration and operation of emission color control system>
FIG. 13 is a block diagram illustrating a configuration of a light emission color control system including a light emission intensity adjustment device 240 that adjusts the light emission color of the light emitting element 210. As shown in FIG. 13, the emission intensity adjustment device 240 that adjusts the emission color of the light emitting element 210 is different from the emission intensity adjustment device 40 according to the first embodiment in that a superposition circuit 246 is added. Other components are the same. Therefore, among the components of the light emission intensity adjustment device 240, the same or corresponding components as those of the light emission intensity adjustment device 40 are denoted by the same reference numerals and description thereof is omitted.

  The light emission intensity adjustment device 240 includes a superimposing circuit 246 connected to the pulse generation circuit 45 and the power supply circuit 50. The superimposing circuit 246 superimposes the pulse signals Sr, Sg, Sb representing the drive current value output from the pulse generating circuit 45 on the negative DC voltage output from the power supply circuit 50. Is applied to the lead 22 of the light emitting element 210. Further, a positive DC voltage is applied to the lead 21 without superimposing other signals in the superposition circuit 246.

  As described above, since the light emission intensity adjusting device 240 includes the superimposing circuit 246, even if the light emitting element 210 is not provided with a dedicated lead for providing the pulse signals Sr, Sg, and Sb, the light emitting element 210 is provided. Pulse signals Sr, Sg, Sb can be given, and various commands can be given to the MCU 15.

  14A is a circuit diagram of the superposition circuit 246, and FIG. 14B is a circuit diagram of the distribution circuit 217. In the superposition circuit 246 shown in FIG. 14A, the output end of the pulse generation circuit 45 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to one end of the coil L1, and the other end of the coil L1 is grounded. Is done. A connection point between the other end of the capacitor C1 and one end of the coil L1 is connected to the lead 22 of the light emitting element 10. When the pulse signal Sr, Sg, Sb is applied to one end of the capacitor C1 from the pulse generation circuit 45, a signal obtained by superimposing the pulse signals Sr, Sg, Sb on the negative DC voltage is emitted to the superposition circuit 246. This is applied to the lead 22 of the element 210.

  In the distribution circuit 217 shown in FIG. 14B, one terminal of the capacitor C2 and one terminal of the coil L2 are connected, and the lead 22 of the light emitting element 210 is connected to the connection point. The other terminal of the coil L2 is connected to the LED driver 14, the MCU 15 and the flash memory 16, and the other output terminal of the capacitor C2 is connected to the MCU 15. In such a distribution circuit 217, when pulse signals Sr, Sg, Sb superimposed on the negative DC voltage are applied, the negative DC voltage is blocked by the capacitor C2, but passes through the coil L2. Can do. On the other hand, since the pulse signals Sr, Sg, Sb are AC signals, they are blocked by the coil C2, but can pass through the capacitor C2. Therefore, when a negative DC voltage on which the pulse signals Sr, Sg, Sb are superimposed is applied to the superimposing circuit 246, the negative DC voltage passes through the coil L2, and the LED driver 14, MCU 15 and flash memory 16 The pulse signals Sr, Sg, Sb are applied to the MCU 15 through the capacitor C2. Note that the superposition circuit 246 illustrated in FIG. 14A and the distribution circuit 217 illustrated in FIG. 14B are examples of the superposition circuit and the distribution circuit, respectively, and other superposition circuits and distribution circuits may be used.

  The process in which the MCU 43 of the light emission intensity adjusting device 240 writes the drive current values of the LED chips 11 to 13 in the flash memory 16 built in the light emitting element 210 is performed by the MCU 43 of the light emission intensity adjusting device 40 according to the first embodiment. Compared with the process of writing the drive current values of the LED chips 11 to 13 in the flash memory 16 of the light emitting element 10, the following points are different. That is, in step S3 of FIG. 5 and step S17 of FIG. 7, when the drive current values of the LED chips 11 to 13 are given to the light emitting element 210 as the pulse signals Sr, Sg, Sb, they are given via the dedicated lead 23. Rather, it is different in that it is superimposed on the negative DC voltage. However, since the other steps are the same, the description of the flowchart and other steps is omitted in this embodiment.

  The pulse signals Sr, Sg, Sb generated by the pulse generation circuit 45 and representing the drive current values to be applied to the LED chips 11 to 13 are superimposed on the negative side DC voltage by the superimposing circuit 246 and applied to the lead 22. This is because the LED driver 14, the MCU 15 and the flash memory 16 often use a negative DC voltage as a reference voltage. However, the pulse signals Sr, Sg, and Sb are not limited to being superimposed on the negative DC voltage, and may be superimposed on the positive DC voltage and applied to the lead 21.

<3. Third Embodiment>
<3.1 Light emitting element and its operation>
FIG. 15 is a block diagram showing a configuration of a light emitting device 310 according to the third embodiment of the present invention. Among the constituent elements of the light emitting element 310 according to the present embodiment, constituent elements that are the same as or correspond to those of the light emitting element 10 according to the first embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  A light emitting element 310 illustrated in FIG. 15 includes an antenna 319 and a reception circuit 318 connected to the antenna 319, and the reception circuit 318 is connected to the MCU 15. The light emitting element 310 receives an electric wave including pulse signals Sr, Sg, and Sb transmitted from the outside and generated based on the PWM signal of each color component by the antenna 319. The receiving circuit 318 separates the pulse signals Sr, Sg, Sb included in the received radio wave and gives them to the MCU 15. The MCU 15 obtains the drive current value of the LED chips 11 to 13 for each color component based on the given pulse signals Sr, Sg, Sb, and gives the obtained drive current value to the LED driver 14.

  In addition, when the antenna 319 receives a radio wave including a signal representing a command for the light emitting element 310 to control the operation of the MCU 15, the reception circuit 318 separates the signal included in the received radio wave and applies the signal to the MCU 15. The MCU 15 converts the separated signal into an instruction for controlling the operation of the MCU 15, and writes a given drive current value to the flash memory 16 based on the converted instruction, prohibits writing, or prohibits writing. Or cancel.

  In order to receive the radio wave including the pulse signals Sr, Sg, Sb generated based on the PWM signal of each color component by the antenna 319 and write the driving current values of the LED chips 11 to 13 to the flash memory 16, It is necessary to supply a power supply voltage to the LED driver 14, the MCU 15, the flash memory 16, and the receiving circuit 318, respectively. Therefore, the power supply voltage may be supplied from the outside via the antenna 319 similarly to the pulse signals Sr, Sg, Sb, or may be supplied via the leads 21 and 22 of the light emitting element 310. Therefore, it is possible to rewrite the drive current values of the LED chips 11 to 13 written in the flash memory 16 of the light emitting elements 310 to which the power supply voltage is not applied or the light emitting elements 310 mounted on the printed board.

  FIG. 16 is an exploded perspective view showing the mounting substrate 330 sealed inside the sealing resin member 20 of the light emitting element 310. Among the components of the mounting substrate 330 shown in FIG. 16, the same or corresponding components as those of the mounting substrate 30 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Unlike the mounting substrate 30, the lower substrate 332 is provided with two leads 21 and 22 for supplying a power supply voltage, and for extracting pulse signals Sr, Sg, and Sb from radio waves received by the antenna 319. A receiving circuit 318 is mounted. An antenna 319 made of a conductive pattern such as a copper foil printed along the periphery of the upper substrate 331 is formed on the upper substrate 331 so as to surround the LED chips 11 to 13.

  The antenna may be formed in an empty space of the upper substrate 331 or the lower substrate 332, or a substrate on which only the antenna is formed is added to the mounting substrate 330 separately from the upper and lower substrates. May be.

  In addition, since the connection relationship between the red, green, and blue LED chips 11 to 13 and the LED driver 14 in the light emitting element 310 is the same as that of the light emitting element 10 shown in FIG. 2, the circuit diagram and the description thereof are omitted.

<3.2 Configuration and operation of emission color control system>
FIG. 17 is a block diagram illustrating a configuration of a light emission color control system including a light emission intensity adjustment device 340 that adjusts the light emission color of the light emitting element 310. In the light emission intensity adjustment device 340 shown in FIG. 17, a transmission circuit 347 is provided in the light emission intensity adjustment device 40 according to the first embodiment. Therefore, among the components of the light emission intensity adjustment device 340, the same or corresponding components as those of the light emission intensity adjustment device 40 are denoted by the same reference numerals and description thereof is omitted.

  A positive DC voltage is applied to the lead 21 and a negative DC voltage is applied to the lead 22 from the power supply circuit 50 of the light emission intensity adjusting device 340. Further, pulse signals Sr, Sg, Sb generated by the pulse generation circuit 45 based on the PWM signal representing the drive current value of each LED chip 11 to 13 output from the MCU 43 is given to the transmission circuit 347. The transmission circuit 347 time-divides the applied pulse signals Sr, Sg, Sb, places them on radio waves, and transmits them from the antenna 348 toward the light emitting element 310. In addition, the transmission circuit 347 transmits the signal to the light emitting element 310 in the same manner even when signals representing various commands to the MCU 15 of the light emitting element 310 are given.

  As described above, when the drive current value is written in the flash memory 16 of the light emitting element 310, it is not necessary to attach the light emitting element 310 to the light emission intensity adjusting device 340. For this reason, the drive current value of each LED chip 11-13 and the various instructions with respect to MCU15 can be given simultaneously to the some light emitting element 310, or can be given to the light emitting element 310 mounted in the printed circuit board.

  The process in which the MCU 43 of the light emission intensity adjustment device 340 writes the drive current values of the LED chips 11 to 13 in the flash memory 16 built in the light emitting element 310 is performed by the MCU 43 of the light emission intensity adjustment device 40 according to the first embodiment. Compared with the process of writing the drive current values of the LED chips 11 to 13 in the flash memory 16 of the light emitting element 10, the following points are different. That is, in step S3 of FIG. 5 and step S17 of FIG. 7, when the obtained drive current values of the LED chips 11 to 13 are given to the light emitting element 310 as the pulse signals Sr, Sg, Sb, they are given via leads. It is different in that it is applied to radio waves. However, since the other steps are the same, the flowchart and the description of the other steps are omitted in this embodiment.

<Fourth Embodiment>
FIG. 18 is a block diagram showing a configuration of a light emitting device 410 according to the fourth embodiment of the present invention. Among the constituent elements of the light emitting element 410 according to this embodiment, constituent elements that are the same as or correspond to those of the light emitting element 10 according to the first embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  In the light emitting element 10 according to the first embodiment, the drive current values of the LED chips 11 to 13 are written in the flash memory 16. In this case, since the flash memory 16 is a rewritable memory, the drive current value once written can be rewritten to a desired current value.

  However, depending on the use of the light emitting element, it may not be necessary to rewrite the drive current value once written. In this case, an inexpensive memory such as a mask ROM (Read Only Memory) that can be written only once can be used instead of an expensive memory such as a flash memory that is a rewritable memory. . In addition, since it is not necessary to provide the drive current values of the LED chips 11 to 13 from the outside via leads, the light emitting element 410 only needs to have two leads 21 and 22 in order to apply a power supply voltage. It is not necessary to provide a distribution circuit, a reception circuit, or the like. For this reason, the manufacturing cost of the light emitting element 410 can be kept low. The light emitting element 410 only needs to be provided with two leads 21 and 22 for supplying a power supply voltage. For this reason, the conventional light emitting element can be replaced with the light emitting element 410 without changing the wiring of the printed circuit board.

  FIG. 19 is an exploded perspective view showing the mounting substrate 430 sealed inside the sealing resin member 20 of the light emitting element 410. Among the components of the mounting substrate 430 shown in FIG. 19, the same or corresponding components as those of the mounting substrate 30 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. Similar to the mounting substrate 30, the lower substrate 432 on the mounting substrate 430 is provided with two leads 21 and 22 for supplying a power supply voltage, and a mask ROM 416 is mounted instead of the flash memory. ing.

  In the light emitting element 410, since the drive current values of the LED chips 11 to 13 written in the mask ROM 416 cannot be rewritten, the light emission intensity adjusting device becomes unnecessary, and the cost required for it can be reduced. Instead of the mask ROM, a memory that can be written only once, such as OTP (One Time Programmable ROM) or PROM (Programmable ROM), may be used.

  In addition, since the connection relationship between the red, green, and blue LED chips 11 to 13 and the LED driver 14 in the light emitting element 410 is the same as that of the light emitting element 10 illustrated in FIG. 2, the circuit diagram and the description thereof are omitted.

<5. Modification>
FIG. 20 is a diagram showing a modification of the arrangement of LED chips, and FIG. 20A is a diagram showing the arrangement of four red, green, and blue LED chips 511 to 514, and FIG. ) Is a circuit diagram showing a connection relationship between the LED chips 511 to 514 shown in FIG. The substrate 531 is used instead of the substrates 31, 131, 231, 331, 431 on the upper side of the light emitting elements 10, 110, 210, 310, 410. As shown in FIG. 20A, a total of four LED chips, that is, two red LED chips 511 and 514 and green and blue LED chips 512 and 513 are mounted on the substrate 531. The four LED chips 511 to 514 have two red LED chips 511 and 514 arranged in a diagonal direction, and the green and blue LED chips 512 and 513 are arranged in different diagonal directions, and two rows and two columns. A matrix is formed.

  20B, the two red LED chips 511, 514, green and blue LED chips 512, 513 connected in series are connected to the LED driver 14, respectively.

  In this way, the two red LED chips 511 and 512 are connected in series and connected to the LED driver 14 and the green and blue LED chips 512 and 513 are connected to the LED driver 14 one by one. Because of the reason. That is, since the pressure resistance per one of the red LED chips 511 and 512 is only about ½ of the pressure resistance of the green and blue LED chips 512 and 513, the two red LED chips 511 and 512 should be used. This is because the green and blue LED chips 512 and 513 are handled in the same manner. Another reason is to brighten the light of the light-emitting element in which the red light is brightened to the same extent as the green and blue light.

  Further, in each of the above-described embodiments, the light emitting elements 10, 110, 210, 310, and 410 in which the LED chips 11 to 13 are sealed with the bullet-shaped sealing resin member 20 have been described. However, the present invention is not limited to this. For example, a bubble-type light emitting device in which an LED chip is covered with a hollow light-transmitting cover, or a plurality of recesses are provided on the outer surface of the light-transmitting cover, and the LED chip is accommodated therein. Any light emitting element that emits light by supplying a driving current to the LED chip, such as a light emitting element, may be used.

It is a block diagram which shows the structure of the light emitting element which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection relation of each LED chip in the light emitting element of FIG. It is a disassembled perspective view which shows the mounting substrate of the light emitting element of FIG. It is a block diagram which shows the structure of the light emission color control system containing the light emission intensity adjustment apparatus for adjusting the light emission color of the light emitting element of FIG. It is a flowchart which shows operation | movement of the light emission intensity adjustment apparatus when adjusting the luminescent color of the light emitting element of FIG. It is a flowchart which shows operation | movement of the light emission intensity adjustment apparatus when adjusting the luminescent color of the light emitting element of FIG. It is a flowchart which shows operation | movement of the light emission intensity adjustment apparatus when adjusting the luminescent color of the light emitting element of FIG. It is a block diagram which shows the structure of the light emitting element which concerns on the modification of 1st Embodiment. It is a disassembled perspective view which shows the mounting substrate of the light emitting element of FIG. It is a block diagram which shows the structure of the light emission color control system containing the light emission intensity adjustment apparatus for adjusting the light emission color of the light emitting element of FIG. It is a block diagram which shows the structure of the light emitting element which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the mounting substrate of the light emitting element of FIG. It is a block diagram which shows the structure of the light emission color control system containing the light emission intensity adjustment apparatus for adjusting the light emission color of the light emitting element of FIG. (A) is a circuit diagram of a superposition circuit, and (B) is a circuit diagram of a distribution circuit. It is a block diagram which shows the structure of the light emitting element which concerns on the 3rd Embodiment of this invention. FIG. 16 is an exploded perspective view illustrating a mounting substrate of the light emitting element of FIG. 15. FIG. 16 is a block diagram illustrating a configuration of a light emission color control system including a light emission intensity adjustment device for adjusting a light emission color of the light emitting element of FIG. 15. It is a block diagram which shows the structure of the light emitting element which concerns on the 4th Embodiment of this invention. It is a disassembled perspective view which shows the mounting substrate of the light emitting element of FIG. It is a figure which shows the modification of arrangement | positioning of an LED chip, (A) is a figure which shows arrangement | positioning of four LED chips, (B) is a circuit diagram which shows the connection relation of each LED chip shown to (A). is there.

Explanation of symbols

10, 110, 210, 310, 410 ... Light emitting element 11-13, 511-514 ... LED chip 14 ... LED driver 15, 43 ... MCU
DESCRIPTION OF SYMBOLS 16 ... Flash memory 21, 22, 23, 124-126 ... Lead 30, 130, 230, 330, 430 ... Mounting board 41 ... Sample side sensor 42 ... Sample side frequency conversion circuit 45 ... Pulse generation circuit 50 ... Power supply circuit 52 ... Clone side sensor 53 ... Clone side frequency conversion circuit 61 ... Automatic / manual switching unit 62 ... Intensity adjustment unit 71 ... Sample side monitor 72 ... Sample side LED lamp 73 ... Clone side monitor 74 ... Clone side LED lamp 217 ... Distribution circuit 246 ... Superimposing circuit 318 ... receiving circuit 319, 348 ... antenna 347 ... transmitting circuit 416 ... mask ROM

Claims (18)

A light-emitting element that adjusts the emission color by simultaneously lighting a plurality of LEDs,
A drive unit for supplying a drive current to each of the plurality of LEDs;
A nonvolatile memory for storing a value corresponding to the current value of the drive current;
A control unit that reads out a value corresponding to a current value of the drive current stored in the nonvolatile memory and applies the value to the drive unit;
Two leads for providing a DC power supply voltage to the drive unit, the nonvolatile memory, and the control unit;
When the DC power supply voltage is applied to the two leads, the control unit reads a value corresponding to the current value of the drive current from the nonvolatile memory to obtain a current value of the drive current, Giving the drive unit a current value of a drive current;
The light emitting device, wherein the driving unit supplies the driving current to each of the plurality of LEDs based on a current value of the driving current given from the control unit. Each of the plurality of LEDs further comprises one lead to which a current value signal representing the current value of the driving current is given from the outside in a time division manner,
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit supplies a value corresponding to the current value of the drive current obtained from the current value signal given in a time division manner to the nonvolatile memory based on a control signal given to the one lead from the outside. The light emitting device according to claim 1, wherein the light emitting device is stored. In order to externally provide a current value signal representing the current value of the drive current to each of the plurality of LEDs, the LED further comprises a plurality of leads provided corresponding to the plurality of LEDs,
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit corresponds to a current value of the drive current obtained from the current value signal respectively given to the plurality of leads based on a control signal given to any of the plurality of leads from the outside. The light emitting device according to claim 1, wherein a value is stored in the nonvolatile memory.   4. The light emitting device according to claim 2, wherein a length of the one lead and the plurality of leads is shorter than a length of the two leads. 5. The current value signal, which is applied from the outside and superimposed on one of the DC power supply voltages supplied via the two leads, and represents the current value of the drive current, is separated from the DC power supply voltage, and the separated current value A distribution unit for supplying a signal to the control unit and supplying the separated DC power supply voltage to the drive unit, the nonvolatile memory, and the control unit;
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit supplies a value corresponding to the current value of the drive current obtained from the separated current value signal to the nonvolatile memory based on a control signal given to one of the two leads from the outside. The light emitting device according to claim 1, wherein the light emitting device is stored.   The light emitting device according to claim 5, wherein the current value signal is superimposed on a negative DC power supply voltage of the DC power supply voltage. An antenna for receiving a radio wave including a current value signal representing a current value of the drive current, which is transmitted from the outside;
A receiver that separates the current value signal from the radio wave received by the antenna, and that provides the separated current value signal to the control unit;
The nonvolatile memory is a rewritable nonvolatile memory,
The control unit stores a value corresponding to the current value of the driving current obtained from the separated current value signal in the nonvolatile memory based on a control signal given from the outside via the antenna. The light emitting device according to claim 1, wherein the light emitting device is characterized.   The light-emitting element according to claim 2, wherein the rewritable nonvolatile memory is a flash memory.   The light emitting device according to claim 1, wherein the nonvolatile memory is a non-rewritable memory. The plurality of LEDs are:
Including two red LEDs, one green LED, and one blue LED,
The light emitting device according to claim 1, wherein the two red LEDs are connected in series. A sample light source that emits light of a predetermined color, a light emitting element, and a light emission intensity adjusting device that causes the light emitting element to emit light having a color similar to the sample light source when the sample light source and the light emitting element are mounted. An emission color control system comprising:
The light emitting element is
A plurality of LEDs each emitting light of a plurality of colors;
A drive unit for supplying a drive current to each of the plurality of LEDs;
A rewritable nonvolatile memory that stores a value corresponding to a current value of a drive current supplied to each of the plurality of LEDs;
A value corresponding to the current value of the drive current stored in the nonvolatile memory is read and the current value of the drive current is given to the drive unit, or the current value of the drive current given from the light emission intensity adjusting device is A control unit that feeds the drive unit,
The drive unit, the nonvolatile memory, and two leads for applying a DC power supply voltage to the control unit,
The emission intensity adjusting device is
A first light receiving portion for receiving light from the sample light source;
First level detection means for detecting the light emission intensity level of the sample light source for each of the plurality of colors based on the output of the first light receiving unit;
Current value calculating means for obtaining a current value of a drive current of the plurality of LEDs based on the detected light emission intensity level for each of the plurality of colors;
A signal output unit that generates a current value signal representing the current value of the drive current based on the current value of the drive current obtained by the current value calculation means and outputs the current value signal to the light emitting element;
A second light receiving portion for receiving light from the light emitting element;
Second level detection means for detecting a level of light emission intensity of the LED for each of the plurality of colors based on an output of the second light receiving unit;
Comparison means for comparing the light emission intensity level of the sample light source and the light emission intensity level of the light emitting element for each of the plurality of colors;
As a result of comparison by the comparison means, when there is a color that does not match the corresponding emission intensity level of the sample light source among the emission intensity levels of the light emitting element, the emission intensity level of the light emitting element for the non-matching color Level adjusting means for adjusting the light emission intensity level of the light emitting element so that the light emission intensity level of the sample light source matches.
As a result of comparison by the comparison means, when the light emission intensity level of the light emitting element and the light emission intensity level of the sample light source match for each of the plurality of colors, a value corresponding to the current value of the drive current is An emission color control system comprising: an instruction output unit that outputs an instruction to be stored in a nonvolatile memory. The light emitting element further includes one lead for giving the current value signal to be supplied to each of the plurality of LEDs from the outside in a time division manner,
The light emission color control system according to claim 11, wherein the signal output unit of the light emission intensity adjusting device outputs the current value signal to the one lead of the light emitting element in a time-sharing manner. The light emitting element further includes a plurality of leads provided in correspondence with the plurality of LEDs in order to externally supply the current value signal to each of the plurality of LEDs.
The light emission color control system according to claim 11, wherein the signal output unit of the light emission intensity adjustment device outputs the current value signal to each of the plurality of leads. The light emitting device further includes a distribution unit that separates the current value signal applied from the outside from the DC power supply voltage by superimposing it on any of the DC power supply voltages applied via the two leads,
The signal output unit of the light emission intensity adjusting device further includes a superimposing unit that superimposes the current value signal on any of the DC power supply voltages and applies the superposed signal to the distributing unit. Emission color control system. The light emitting element is
An antenna for receiving radio waves including the current value signal transmitted from the outside;
A signal receiving unit that separates the current value signal from the radio wave received by the antenna and provides the separated current value signal to the control unit; The emission color control system according to claim 11, further comprising a transmission unit configured to transmit a radio wave including a signal toward the reception unit. The emission intensity adjusting device is
A manual selector switch for switching from automatic mode to manual mode;
A selection switch for selecting one of the plurality of LEDs when switched to the manual mode by the manual switch;
A level-up switch that increases the level of light emission intensity of the selected LED;
The light emission color control system according to claim 11, further comprising a level down switch for decreasing a light emission intensity level of the selected LED. The emission intensity adjusting device is
A first monitor for displaying a level of emission intensity for each of the plurality of colors of the sample light source;
The emission color control system according to claim 11, further comprising a second monitor that displays a level of emission intensity for each of the plurality of colors of the light emitting element. The emission intensity adjusting device is
A first LED lamp that reproduces light of the sample light source based on a level of emission intensity for each of the plurality of colors of the sample light source;
The emission color control system according to claim 11, further comprising: a second LED lamp that reproduces light of the light emitting element based on a light emission intensity level for each of the plurality of colors of the light emitting element. .

Images