JP2007080882A - Light adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a yield and enhance productivity, and adjust a color of mixed light accurately and easily without complicating a circuit configuration of a light emitter even if each of light emitting diodes has a variation in productivity. <P>SOLUTION: First, when a current is applied to each of light emitting diodes 40, 41 and 42 from a fixed current source 5, an optical sensor 2 detects while light. Next, the white light detected by the optical sensor 2 is diffracted, and intensities of red, green and blue lights are detected. Then a comparator 31 inputs the intensities of the red, green and blue lights as detection values from the optical sensor 2, and compares them with a reference value stored in advance in a storage 30. When it is determined that the detection value differs from the referenece value, a setting section 32 sets resistance values of variable resistances 43, 44 and 45 so as to make the resistance values coincide with the reference values. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light adjusting device for adjusting the color of mixed color light generated by colored light emitted from a plurality of light emitting diodes.

  2. Description of the Related Art Conventionally, there is a lighting fixture that generates mixed color light when each of a plurality of light emitting diodes emits one of a plurality of colored lights. For example, a lighting device (lighting fixture) disclosed in Patent Literature 1 includes a red light emitting diode, a green light emitting diode, and a blue light emitting diode, and a plurality of lightings corresponding to the red light emitting diode, the green light emitting diode, and the blue light emitting diode, respectively. A circuit and a dimming signal generating circuit for supplying a dimming signal to each lighting circuit. In the lighting device disclosed in Patent Document 1, each of the plurality of lighting circuits receives a dimming signal from the dimming signal generation circuit and corresponds based on the toning data stored in the storage unit. By controlling the voltage applied to the light emitting diode, it is possible to emit red light, green light, and blue light to obtain mixed color light according to the user's preference.

  However, in the case where the production variation of each light emitting diode is large, the above-mentioned lighting fixture has to select in advance a light emitting diode having excellent characteristics from a plurality of light emitting diodes having a large production variation in order to obtain a target color mixture light. Therefore, there was a problem that the yield was poor. There is also a problem that color adjustment of the mixed color light cannot be performed when the target mixed color light cannot be obtained after assembly.

As a solution to the above problem, Patent Document 2 discloses that a light sensor detects light intensities of a plurality of different wavelengths emitted from a plurality of LED chips, and feedback based on a difference between a detection value of the light sensor and a reference value. A light source device (lighting fixture) that adjusts the light from each LED chip by operating the LED chip according to the amount is disclosed.
JP 2004-55361 A (pages 4-7 and FIGS. 1 and 2) JP 2004-193029 A (pages 6 to 11 and FIG. 1)

  However, since the lighting fixture disclosed in Patent Document 2 is not provided with an element that is electrically connected to an LED chip that is a light emitting unit, the power supply itself that drives each LED chip must be operated. For this reason, it is necessary to provide a power source for each LED chip, and there is a problem that the circuit configuration becomes complicated.

  The present invention has been made in view of the above points, and its object is to improve the yield even if there is a production variation in each light emitting diode without complicating the circuit configuration of the light emitting section. An object of the present invention is to provide a light adjusting device that can increase productivity and can easily perform color adjustment of mixed color light with high accuracy.

  The invention according to claim 1 detects mixed color light generated by colored light emitted from a light emitting unit including a plurality of light emitting diodes and a plurality of current limiting elements connected in parallel to each of the plurality of light emitting diodes. An optical sensor for obtaining the intensity of each color light by dispersing the detected mixed color light; storage means for storing in advance a reference value of the intensity of each color light; and the intensity of each color light. The detection value is input when the detection value is input as a detection value from an optical sensor and the detection value is different from the reference value based on the comparison result, and comparison means for comparing whether or not the detection value matches the reference value. And setting means for setting parameters of the plurality of current limiting elements so as to coincide with the reference value.

  In this configuration, the color mixture light is dispersed, the intensity of each color light is compared with a reference value, the parameter of the current limiting element connected in parallel to each light emitting diode is individually set, and each color light is Since the intensity can be adjusted, the circuit configuration of the light emitting part is not complicated, and even if there is a production variation in each light emitting diode, the yield can be improved and the productivity can be increased, and the color of the mixed light Adjustment can be performed easily with high accuracy.

  According to a second aspect of the present invention, the color of the mixed color light generated by the colored light emitted from the light emitting unit including a plurality of light emitting diodes and a plurality of current limiting elements connected in parallel to each of the plurality of light emitting diodes. An optical sensor for detecting the degree of color; storage means for preliminarily storing a reference value of the chromaticity of the mixed-color light; and input the chromaticity of the mixed-color light as a detection value from the optical sensor, wherein the detection value is the reference value A comparing means for comparing whether or not they match, and when the detected value is different from the reference value based on the comparison result, the parameters of the plurality of current limiting elements are set so that the detected value matches the reference value. And setting means for setting.

  In this configuration, the intensity of each colored light can be adjusted by comparing the chromaticity of the mixed color light with a reference value and individually setting the size of the parameter of the current limiting element connected in parallel to each light emitting diode. Therefore, even if there is a production variation in each light emitting diode without complicating the circuit configuration of the light emitting unit, the yield can be improved and the productivity can be increased, and the color adjustment of the mixed light can be easily performed with high accuracy. be able to.

  According to the present invention, even if there is a production variation in each light emitting diode without complicating the circuit configuration of the light emitting unit, the yield can be improved and the productivity can be improved, and the color adjustment of the mixed color light can be performed accurately. Well done easily.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating a configuration of the light adjustment device according to the first embodiment.

  First, the basic configuration of the first embodiment will be described. As illustrated in FIG. 1, the light adjustment device 1 according to the first embodiment includes a light sensor 2 and a lighting control device 3, and is connected to a light emitting unit (LED package) 4.

  The light emitting unit 4 includes a red light emitting diode 40, a green light emitting diode 41, a blue light emitting diode 42, and three variable resistors 43, 44, 45. The red light emitting diode 40, the green light emitting diode 41 and the blue light emitting diode 42 are connected in parallel to the constant current source 5, and emit red light, green light and blue light when a current flows from the constant current source 5. Thereby, the light emission part 4 produces | generates white light combining red light, green light, and blue light.

  The three variable resistors 43, 44, and 45 are connected in parallel with the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode 42, respectively. The variable resistors 43, 44, and 45 are current limiting elements that can change the magnitude of the current flowing through the light emitting diodes 40, 41, and 42 by changing the magnitude of the resistance value. The variable resistors 43, 44, 45 may be electronic resistors mounted together with the light emitting diodes 40, 41, 42.

  On the other hand, the optical sensor 2 is connected to a comparison unit 31 described later. When the current from the constant current source 5 flows to the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode 42, the photosensor 2 is generated from the colored light emitted from each light emitting diode 40, 41, 42. The white light of the mixed color light is detected. Furthermore, the optical sensor 2 is a spectroscope, which spectrally separates the detected white light, obtains the respective intensities of red light, green light, and blue light and outputs them to the comparison unit 31 as detection values.

  The lighting control device 3 includes a storage unit 30, a comparison unit 31, and a setting unit 32.

  The storage unit 30 is connected to the comparison unit 31 and stores in advance reference values for the intensity of red light, green light, and blue light. The reference value of the intensity is an average value of the intensity of the light emitting diodes in the same lot as the light emitting diodes 40, 41, and 42 in the initial state.

  The comparison unit 31 is connected to the optical sensor 2 and further connected to the storage unit 30 and the setting unit 32. The comparison unit 31 detects the intensities of red light, green light, and blue light from the light sensor 2 when the constant current source 5 flows through the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode 42. Enter as. Thereafter, the comparison unit 31 compares the detected value with the reference value stored in the storage unit 30 and outputs a comparison signal based on the comparison result to the setting unit 32. In the above comparison, the detection value matches the reference value includes not only the case where the detection value is equal to the reference value but also the case where the detection value is within 10% above and below the reference value. Thereby, it is possible to remove the influence of the variation in the detected value.

  The setting unit 32 is connected to the comparison unit 31. The setting unit 32 receives a comparison signal from the comparison unit 31 for each color light, and if the detection value is different from the reference value, the light emission that emits the corresponding color light so that the detection value matches the reference value. The resistance values of the variable resistors 43, 44, 45 connected in parallel with the diodes 40, 41, 42 are set. Specifically, the setting unit 32 increases the resistance values of the variable resistors 43, 44, and 45 so that the current flowing through the light emitting diodes 40, 41, and 42 increases when the detected value is smaller than the reference value. To do.

  Next, a color adjustment method for white light in the light adjustment apparatus according to the first embodiment will be described with reference to FIG. Note that the storage unit 30 already stores reference values of the intensity of red light, green light, and blue light. First, when a current flows from the constant current source 5 to each of the light emitting diodes 40, 41, and 42, the photosensor 2 detects white light. Subsequently, the white light detected by the optical sensor 2 is dispersed to detect the intensities of red light, green light, and blue light. Thereafter, the comparison unit 31 inputs the intensities of red light, green light, and blue light from the optical sensor 2 as detection values, and compares whether the detection value matches the reference value. When the detected value is different from the reference value based on the comparison result, the setting unit 32 sets the resistance values of the variable resistors 43, 44, and 45 so that the detected value matches the reference value.

  As described above, according to the first embodiment, the intensity of the red light, the green light, and the blue light is compared with the reference values by dividing the white light that is the mixed color light, and the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode are compared. Since the intensity of each colored light can be adjusted by automatically setting the magnitude of the current of 42 individually, even if there is production variation in each light emitting diode 40, 41, 42, the yield is improved. Productivity can be increased and color adjustment of white light can be easily performed with high accuracy. In addition, since the plurality of light emitting diodes 40, 41, 42 are configured to be connected to one constant current source 5, the circuit configuration of the light emitting unit 1 is not complicated. Furthermore, since the single optical sensor 2 can separately detect the intensity of red light, green light and blue light by separating white light, the number of components can be reduced.

(Embodiment 2)
A second embodiment of the present invention will be described.

  The light adjustment device according to the second embodiment includes the lighting control device 3 and is connected to the light emitting unit 4, similarly to the light adjustment device according to the first embodiment (see FIG. 1). There are no features described below.

  The light adjustment device of the second embodiment includes an optical sensor that detects chromaticity instead of the optical sensor 2 of the first embodiment. The optical sensor of the second embodiment is also connected to the comparison unit 31 in the same manner as the optical sensor 2 of the first embodiment. When the current from the constant current source 5 flows to the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode 42, the photosensor is generated from the colored light emitted from each light emitting diode 40, 41, 42. The chromaticity of white light that is mixed color light is detected and output to the comparison unit 31 as a detection value.

  In addition, the storage unit 30 of the lighting control device 3 according to the second embodiment stores in advance the reference value of the chromaticity of white light instead of the reference value of the intensity of red light, green light, and blue light according to the first embodiment. Yes. In addition, the memory | storage part 30 of Embodiment 2 is the same as that of the memory | storage part of Embodiment 1 in points other than the above.

  Next, a color adjustment method for white light in the light adjustment apparatus according to the second embodiment will be described. The light adjustment device of the second embodiment has the same configuration except for the light adjustment device of the first embodiment and the optical sensor 2, and will be described with reference to FIG. In addition, the storage unit 30 already stores a reference value for the chromaticity of white light. First, as in the first embodiment, when current flows from the constant current source 5 to each of the light emitting diodes 40, 41, and 42, the optical sensor detects the chromaticity of white light. Thereafter, the comparison unit 31 inputs the chromaticity of white light from the optical sensor 2 as a detection value, and compares whether or not the detection value matches the reference value. When the detected value is different from the reference value based on the comparison result, the setting unit 32 sets the resistance values of the variable resistors 43, 44, and 45 so that the detected value matches the reference value.

  As described above, according to the second embodiment, the chromaticity of the white light that is the mixed color light is compared with the reference value, and the current magnitudes of the red light emitting diode 40, the green light emitting diode 41, and the blue light emitting diode 42 are automatically and individually determined. Since the intensity of each colored light can be adjusted by setting, even if there is a production variation in each light emitting diode 40, 41, 42, it is possible to improve the yield and increase the productivity, Color adjustment can be easily performed with high accuracy. In addition, since the plurality of light emitting diodes 40, 41, 42 are configured to be connected to one constant current source 5, the circuit configuration of the light emitting unit 1 is not complicated.

(Embodiment 3)
Embodiment 3 of the present invention will be described.

  The light adjusting device of Embodiment 3 comprises the lighting fixture with the light emission part 4 (refer FIG. 1). Similarly to the light adjustment device 1 (see FIG. 1) of the first embodiment, the light adjustment device of the third embodiment includes the light sensor 2 and the lighting control device 3, and is connected to the light emitting unit 4 and is also an embodiment. 1 has the same function as the light adjusting device 1.

  As described above, according to the third embodiment, since the light emitting unit 4 is always connected, the color adjustment of the white light by the colored light from the light emitting unit 4 can be performed even after the start of use.

  As a modification of the third embodiment, the light adjustment device of the second embodiment may constitute a lighting fixture together with the light emitting unit. Even if it is such a structure, there can exist an effect similar to Embodiment 3. FIG.

  Moreover, as a modification of any one of the first to third embodiments, the light emitting unit may include a plurality of other current limiting elements instead of the plurality of variable resistors. Even if it is such a structure, there can exist an effect similar to Embodiment 1-3.

It is the schematic which shows the structure of the light adjustment apparatus of Embodiment 1 by this invention.

Explanation of symbols

2 Optical sensor 30 Storage unit 31 Comparison unit 32 Setting unit 40 Red light emitting diode 41 Green light emitting diode 42 Blue light emitting diodes 43, 44, 45 Variable resistance 5 Constant current source

Claims (2)

Detecting mixed color light generated by colored light emitted from a light emitting unit including a plurality of light emitting diodes and a plurality of current limiting elements connected in parallel to each of the plurality of light emitting diodes, and detecting the detected mixed color light An optical sensor for obtaining the intensity of each colored light by spectroscopic analysis;
Storage means for storing in advance a reference value of the intensity of each colored light;
Comparison means for inputting the intensity of each colored light as a detection value from the optical sensor and comparing whether the detection value matches the reference value;
And a setting unit configured to set parameters of the plurality of current limiting elements so that the detected value coincides with the reference value when the detected value is different from the reference value based on the comparison result. Adjustment device. An optical sensor that detects chromaticity of mixed-color light generated by colored light emitted from a light emitting unit including a plurality of light emitting diodes and a plurality of current limiting elements connected in parallel to each of the plurality of light emitting diodes;
Storage means for storing in advance a chromaticity reference value of the mixed-color light;
Comparison means for inputting the chromaticity of the mixed light as a detection value from the optical sensor and comparing whether or not the detection value matches the reference value;
And a setting unit configured to set parameters of the plurality of current limiting elements so that the detected value coincides with the reference value when the detected value is different from the reference value based on the comparison result. Adjustment device.

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