JP5470617B2 - Lighting device for reproducing candlelight and method for reproducing candlelight - Google Patents

Description

The present invention relates to a lighting device and a reproduction method capable of reproducing the brightness and fluctuation of a candlelight with high reproducibility.

In recent years, candlelight has attracted attention because it has the effect of giving people peace and comfort.
For example, Patent Documents 1 and 2 propose lighting devices that perform a fluctuation operation like a candle. The illumination devices described in these documents change the amount of light of the light source so that the candle flame fluctuates, and each of them includes a memory in which variation data of the amount of light is stored in advance, based on data read from the memory. The light source is driven and controlled.

Japanese Patent No. 2968483 Japanese Patent No. 3402013

By the way, in order to obtain a peaceful and healing effect equivalent to that of a candlelight from an artificial lighting device, it is necessary that the brightness and fluctuation of the lighting of the lighting device be as close as possible to that of a candlelight . This is clear from the usual experience that the psychological effects of healing are reduced by half from the moment when the houseplants placed in the room are found to be fake. However, although the lighting device described in the above document can reproduce a light close to an actual candle by reproducing the fluctuation, it is still far from a natural light. In particular, there is a problem that a lamp having unique lighting characteristics such as a Japanese candle is difficult to reproduce by the technique described in the above-mentioned document.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an illumination device and a reproduction method that can reproduce with high reproducibility even a lamp having unique illumination characteristics such as Japanese candles.

As a result of intensive studies by the inventors of the present invention, in order to reproduce the candlelight more realistically, a plurality of illuminants that achieve the same or similar chromaticity as those of the lamp are combined, and the illumination characteristics The present inventors have conceived that the frequency of light emission should be changed for at least a part of the light emitting color that affects the light emission.
This is supported by the following observation results, for example. Careful observation of the candle flame reveals that the emission color varies with the temperature of each part, that is, there is a specific pattern in the spatial distribution of spectral radiant energy. That is, the periphery of the flame is red because of the low temperature (the wavelength of light is long), the center is blue because of the high temperature (the wavelength is short), and the middle is yellow because the temperature is medium (the wavelength is medium). To the extent) Furthermore, the speed of fluctuation, that is, the frequency is different for each part. In other words, a real candle flame constantly changes in both radiant energy intensity and spectral radiant energy distribution.
In addition, observations show that candles sometimes produce slow fluctuations in addition to the continuous steady changes as described above. This fluctuation has a frequency of about 7 Hz to 13 Hz, centered on about 10 Hz. Moreover, this fluctuation is intrinsic due to convection associated with combustion, and is not extrinsic caused by wind as is simulated by existing technology. Only after faithfully reproducing all of the above-mentioned fluctuation elements, a lighting device with high reproducibility that can be mistaken for a real light can be reproduced.
Specifically, the invention described in claim 1 is an illuminating device that reproduces the brightness and fluctuation of a candle lamp , and has a plurality of chromaticities corresponding to the chromaticity distribution from the center of the flame to the periphery of the lamp to be reproduced. A plurality of light emitters arranged from the center toward the outer periphery according to the chromaticity distribution of the flame, and a regular frequency generating means for giving a constant frequency to a power source supplied to each of the light emitters, Based on the radiant energy change data stored in the storage unit that stores the radiant energy change data obtained by measuring the change in radiant energy for each wavelength of the lamp in advance, a large radiant energy change is achieved. Specifies the emitters of the corresponding at least one chromaticity, it switches the frequency of the power supplied to the light-emitting element to a predetermined visible frequency and brightness at predetermined time intervals and duration It is constituted with the irregular frequency generating means for repeatedly.
In this case, as described in claim 2, the anomalous frequency generating means includes a range of a visible frequency, a range of a predetermined time interval, and a range of a predetermined duration set in advance based on radiant energy change data. The visible frequency, the time interval, and the duration may be changed.

As a preferred embodiment of the present invention, there is a reproduction of a Japanese candle light. When the lamp is a Japanese candle, the chromaticity of the flame of the Japanese candle can be reproduced by a combination of red, blue or green and yellow or orange emission colors, for example. Therefore, as described in claim 3, a light emitter having such three to five emission colors is prepared.
Furthermore, based on the radiant energy change data obtained by observing the Japanese candles (data including the change in the frequency of the lamp, the change in the amount of radiant heat, the change in the luminous intensity, the period of the change and the duration of the change) The generation means may perform a process of switching the frequency for at least a part of the red light emitter. In this case, the time interval for switching the frequency is in the range of 10 seconds to 90 seconds centered on the range of 30 seconds to 50 seconds as described in claim 4, and the frequency is It may be 7 Hz to 13 Hz.
In addition, as described in claim 5, when trying to reproduce the light of a Japanese candle, the regular frequency generation means is 7 Hz to 13 Hz for at least a part of the illuminant of at least one luminescent color. A frequency may be generated. The range of this regular frequency is now found and identified as a frequency band characterizing the Japanese candle by observing the Japanese candle .

Further, according to the reproduction method of the present invention, as described in claim 6 , in the reproduction method of reproducing the brightness and fluctuation of the candlelight using the illuminant, from the center of the flame in the lamp to be reproduced to the periphery. with selecting a plurality of light emitters that have a plurality of emission colors corresponding to the chromaticity distribution, specify at least one light-emitting color of the light emitting element corresponds to a large radiant energy change, radiant energy in the predetermined luminous body A step of selecting a time interval, a duration and a frequency of the change, a step of arranging the light emitters of the respective emission colors from the center toward the outer periphery in accordance with the chromaticity distribution of the flame, and each of the light emitters a step of providing a constant frequency power supplied for the predetermined light emitter, switching said predetermined frequency emission color at the time intervals in a predetermined visible frequency, variable repeat the contrast between the duration A method having a step of.

According to the present invention, it is possible to obtain a lighting device with high reproducibility for candle lighting . Further, by changing the frequency, the time interval, and the duration of the change irregularly within a range based on the radiant energy change data, it is possible to obtain a lighting device that is closer to a candlelight .

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a block diagram illustrating an overall configuration according to an embodiment of the illumination device of the present invention.
[Device configuration]
The illuminating device 1 includes a plurality of types (three types in this embodiment) of light emitters 21, 22, and 23 having different emission colors, and a constant frequency (Hz) for power supplied to the light emitters 21, 22, and 23. A regular frequency generation unit 3 for giving (number of changes per second (cycle / sec)), and an irregular frequency generation unit 4 for performing processing for switching the frequency given from the regular frequency generation unit 3 to a predetermined visible frequency, The switching unit 6 that applies the frequency switched by the irregular frequency generation unit 4 to any one of the light emitters 21, 22, and 23 specified in advance, the radiant energy change data of the lamp that is measured in advance, and the like are stored. And the storage unit 5.

As the light emitters 21, 22, and 23, LEDs that emit light with different light emission colors can be used, and a plurality of types (three types in this embodiment) of light emission colors that can realize the chromaticity of the light by the combination thereof can be used. Prepare things. Although the number of each of the light emitters 21, 22, and 23 to be prepared may be one, the reproducibility of the lamp can be increased by devising the arrangement of the light emitters 21, 22, and 23.

FIG. 1B shows an arrangement example of the light emitters 21, 22, and 23 in the lighting device 1.
It is preferable to arrange the light emitters 21, 22, and 23 having different emission colors as close as possible to the light of the light to be reproduced.
The example shown in FIG. 1B attempts to reproduce the light of a Japanese candle, and emits three light emission colors (red, orange, and blue), which will be described later, according to the shape of the flame of the Japanese candle. The bodies 21, 22, and 23 are arranged. In this example, a red light emitter 21 is disposed from the outer edge of the flame upward, and a blue light emitter 23 is disposed in a portion corresponding to the periphery of the core of the Japanese candle. The orange light emitter 22 is disposed between the light emitter 21 and the light emitter 23. Also, a part of the blue light emitter 23 is arranged so as to be inserted into a part of the orange light emitter 22, and a part of the orange light emitter 22 is a part of the red light emitter 21. Place it in the form of interrupting. By doing in this way, the structure very close to the spatial distribution of the spectral radiant energy of an actual Japanese candle can be made.

In the illuminating device 1 having the above-described configuration, a constant frequency generated by the regular frequency generator 3 is assigned to each of the three types of light emitters 21, 22, and 23. For each of the light emitters 21, 22, 23, when the number of the light emitters 21, 22, 23 is plural, different frequencies may be assigned to some of the light emitters 21, 22, 23. The frequencies generated by the regular frequency generator 3 include those having a frequency of 0 and ∞. Further, the magnitude of the frequency generated by the regular frequency generator 3 is not particularly limited, and includes both those in which changes in light and dark can be recognized by human eyes and those that cannot be recognized.

The irregular frequency generation unit 4 is assigned by the regular frequency generation unit 3 for the light emitters (for example, the light emitters 21) designated based on the data stored in the storage unit 5 among the light emitters 21, 22, and 23. A process of switching the frequency to a visible frequency (about 1 Hz to 15 Hz, preferably about 7 Hz to 13 Hz) is performed. In the case where a plurality of the light emitters (for example, the light emitters 21) are provided, the switching to the visible frequency may be all or part of the light emitters. The switching process is performed at a time interval set in advance in the storage unit 5 and for a duration set in advance in the storage unit 5. In the illuminant whose frequency is switched (for example, the illuminant 21), light and dark are repeated for the duration at the frequency specified by the storage unit 5, and this light and dark may be ON / OFF repetition, It may be repeated with high and low brightness.

The switching unit 6 transmits the frequency generated by the regular frequency generating unit 3 and the frequency switched by the irregular frequency generating unit 4 to each of the light emitters 21, 22, 23 specified by the storage unit 5. Next, the circuit is switched.

FIG. 2 is a graph for explaining the operation of the regular frequency generator 3 and the irregular frequency generator 4.
As shown in FIG. 2A, the regular frequency generator 3 generates and assigns a constant frequency to each of the light emitters 21, 22, and 23. The frequency to be generated may be a straight line consisting of a single frequency, or a wave shape formed by combining a plurality of frequencies having different periods (indicated by a one-dot chain line in FIG. 2 (a)). Also good.

As shown in FIG. 2B, the irregular frequency generation unit 4 uses the frequency assigned by the regular frequency generation unit 3 for one or a plurality of light emitters (for example, the light emitters 21) designated by the storage unit 5. Performs processing to switch to visible frequency. This process is performed at time intervals t2, t4, t6... And durations t1, t3, t5. The time intervals t2, t4, t6... And the durations t1, t3, t5... Are the same (t2 = t4 = t6 =..., T1 = t3 = t5 =. Alternatively, it may be different within the range of each allowable time stored in the storage unit 5.
The visible frequency generated by the irregular frequency generator 4 is preferably in the range of 7 Hz to 13 Hz as described above, but the visible frequencies for the time intervals t2, t4, and t6 are the same in this range. It is good also as a thing of different size. Furthermore, the visible frequency to be generated may be rectangular, but is preferably mountain-shaped as shown in FIG.

[Radiation energy change data]
Frequency is generated by the constant sub-scan frequency generator 3, the frequency is generated by the irregular frequency generator 4, the timing and duration of the occurrence, radiant energy change data to determine the luminous body or the like of interest, the lamp to be reproduction target It can be created by observation. Examples of radiant energy include luminous intensity and radiant heat.
Then, by observing the lamp, a plurality of types of light emission colors that can achieve the same or similar chromaticity as the lamp chromaticity are determined, and the magnitude of the radiant energy change for each lamp wavelength, the frequency before and after the change, the radiant energy Collect data such as the timing (time interval) when the change occurs and the duration of the change.
Data such as changes in radiant energy for each wavelength of the lamp, its frequency, and time interval can be obtained by measuring light of a predetermined wavelength (which is closely related to the emission color) and the radiant energy and frequency of the light. . Further, the chromaticity of the lamp can be determined from the spectral radiant energy distribution of the lamp measured previously.

[Example 1]
Hereinafter, specific examples of the present invention will be described using Japanese candles as an example.
The inventor of the present invention measured the light intensity of a Japanese candle using KONICA MINOLTA: Illuminance meter T-10M.
Instruments: NI cDAQ-9172, NI
9215 was used to collect radiant energy change data. The analysis was performed using the FFT function on CyberNet: MatLab.
As a result, the chromaticity of the Japanese candle light is roughly three of the blue or green that is the innermost of the flame, the red that is the outermost of the flame, and the yellow or orange that is located in the middle. This could be realized by combining one to five emission colors. Therefore, in this embodiment, as the light emitters 21, 22, and 23, three types of light emitters 21, 22, and 23 are prepared according to three types of light emission colors of red, orange, and blue, and the light emitter 21 is prepared. As the light emitter 22, a red material is used, and as the light emitter 22, a blue material is used.

3, 4, and 5 relate to an example of light intensity change data for reproducing the light of a Japanese candle, which is an example of a lamp, and FIG. 3 illustrates the spectrum (vertical axis) and frequency (horizontal) of the Japanese candle. 4 is a graph showing the relationship between spectrum (vertical axis) and frequency (horizontal axis (linear)) for fluctuations peculiar to Japanese candles that appear in the irregular state described below. FIG. 5 is a graph showing the relationship between the luminous intensity (vertical axis) and the frequency (horizontal axis) in each emission color of the Japanese candle.
From the graph of FIG. 3, it can be seen that there is a large change in luminous intensity at around 10 Hz for Japanese candles. This frequency appears even in the regular state, but becomes prominent in the irregular state.

The blue flame located in the vicinity of the core is a stable combustion, and there is not much relation between frequency and change in light intensity. The yellow or orange flame located in the middle has both blue stability and red-like properties in the low frequency range.
On the other hand, in the red system, a large change in luminous intensity is observed in a frequency band around 10 Hz.
From this, it can be seen that Japanese candles are characterized by a change in red frequency around 10 Hz.

In addition, depending on the size of the Japanese candle, it is of a general size used as a lighting, and the frequency change around 10 Hz changes at intervals of several tens of seconds, specifically, 30 seconds to 50 seconds. It lasts for several seconds (about 4 seconds to 5 seconds) at intervals in the range of 10 seconds to 90 seconds centering on the range (core).
The light intensity change data for the Japanese candle is created from the above results and stored in the storage unit 5 together with the conditions shown in Table 1 below.

The operation of the regular frequency generator 3 and the irregular frequency generator 4 in this embodiment will be described below.
The regular frequency generator 3 generates frequencies to be applied to the light emitters 21, 22, and 23 based on the data in Table 1 above. According to the above data, the red light emitter 21 is assigned a frequency of 20 Hz, the orange light emitter 22 is assigned a frequency of 30 Hz, and the blue light emitter 23 is assigned a frequency of 85 Hz.

In this embodiment, only the red light emitter 21 switches the frequency in the irregular frequency generator 4 and the frequency is switched from 20 Hz to 10 Hz. The rate of change of energy indicating light and darkness of the light emitter 21 at the frequency after switching is approximately MAX / MIN = 2.25 (breakdown: MAX / AVE = 1.49, MIN / AVE = 0.66).
Also, the time interval for switching (time interval corresponding to time t2, t4, t6... In FIG. 2) is randomly generated within the range of 30 to 50 seconds, and has a visible frequency of 10 Hz. The duration (duration corresponding to durations t1, t3, t5... In FIG. 2) is randomly generated in the range of 4 to 5 seconds.

The switching unit 6 causes each frequency from the regular frequency generation unit 3 to be transmitted to the light emitter 21, the light emitter 22, and the light emitter 23 in a normal state in accordance with the light intensity change data. Further, when switching to the visible frequency is performed by the irregular frequency generation unit 4, the visible frequency switched by the irregular frequency generation unit 4 is transmitted to the light emitter 21 by switching the circuit.

[Example 2]
In Example 2, the regular frequency generator 3 assigns a mixed frequency obtained by adding a frequency of 15 Hz to a frequency of 1 to 2 Hz to the red light emitter 21, and 1 to 1 for the orange light emitter 22. Two types of frequencies are assigned: a mixed frequency (first frequency) obtained by adding a frequency of 30 Hz to a frequency of 2 Hz, and a frequency (second frequency) of 85 Hz. Further, a frequency of 120 Hz is assigned to the blue light emitter 23.

In the irregular frequency generator 4, the red light emitter 21 and the orange light emitter 22 to which the first frequency is allotted are set to 10 Hz at the same time interval and the same duration as in the first embodiment. A frequency having a multiple cycle of 10 Hz is assigned to the orange light emitter 22 to which the second frequency is assigned. This simulates the fluctuation of the anomalous condition of Japanese candles shown in FIG.
By doing in this way, it is possible to reproduce lighting that is closer to an actual Japanese candle.

[Example 3]
In Example 3, the regular frequency generator 3 assigns a frequency of 7 Hz to 13 Hz to a part of the plurality of red light emitters 21 provided, and 1 to 2 Hz for the remaining light emitters 21. Allocate a mixing frequency that is 15 Hz plus the frequency. The same frequency as that of the second embodiment is assigned to the orange light emitter 22 and the blue light emitter 23. Further, the conditions of the irregularity by the irregular frequency generation unit 4 are the same as those in the second embodiment.
In this embodiment, by assigning a frequency of 7 Hz to 13 Hz to a part of the red light-emitting body 21 at all times, it is possible to reproduce the illumination closer to an actual Japanese candle.

Although the preferred embodiments and examples of the present invention have been described, the present invention is not limited to the above-described embodiments and examples.
For example, in the above description, the main purpose is to reproduce the light of the lamp, but the change of the radiant heat is converted into data as the change of the radiant energy, and a heat source such as a heater is incorporated in the lighting device, and the heater is controlled based on the data. By performing the above, advanced reproduction of radiant heat becomes possible.
In the above description, the illuminant is an LED that emits light of a different luminescent color. However, a light source having a wavelength selectivity (for example, an organic EL or a fluorescent lamp) can be used in the same manner as the LED. Moreover, it is also possible to use a light emitter that reproduces different light emission colors by applying a dye or a colored film to a light source such as a light bulb in which spectral radiation energy is distributed over a wide wavelength range.
Furthermore, in the above description, each of the light emitter 21, light emitter 22, or light emitter 23 is red (light emitter 21), yellow or orange (light emitter 22), blue or green (light emitter 23). ), The light emitter 21, the light emitter 22, or the light emitter 23 may be configured by combining a plurality of light emitters that emit light of different light emission colors. .

The present invention is not limited to Japanese candles as long as it is a light , but can also be applied to the reproduction of light from a Western candle, a line light, a bonfire, and other lights.

BRIEF DESCRIPTION OF THE DRAWINGS (a) is one Embodiment concerning the illuminating device of this invention, the block diagram explaining the whole structure, (b) is a top view explaining the example of arrangement | positioning of a light-emitting body. 4 is a graph for explaining functions of a regular frequency generator 3 and an irregular frequency generator 4. It is a graph which shows an example of the radiant energy change data for reproducing the light of the Japanese candle as a lamp, and shows the relationship between the spectrum (vertical axis) and the frequency (horizontal axis) of the Japanese candle. This is a graph showing the relationship between the spectrum (vertical axis) and frequency (horizontal axis) of a Japanese candle under anomalous conditions, taking an example of radiant energy change data to reproduce the light of a Japanese candle as a lamp. is there. It is a graph which shows an example of the radiant energy change data for reproducing the light of the Japanese candle as a lamp, and shows the relationship between the spectrum (vertical axis) and the frequency (horizontal axis) of each color.

DESCRIPTION OF SYMBOLS 1 Illuminating device 21, 22, 23 Light-emitting body 3 Constant frequency generation part 4 Anomalous frequency generation part 5 Memory | storage part 6 Switching part

Claims (6)

In the lighting device that reproduces the brightness and fluctuation of candlelight ,
A plurality of light emission colors having a plurality of emission colors corresponding to the chromaticity distribution from the center to the periphery of the flame in the lamp to be reproduced, and arranged from the center to the outer periphery according to the chromaticity distribution of the flame. Body ,
A constant frequency generating means for giving a constant frequency to a power source supplied to each of the light emitters;
A storage unit for storing radiant energy change data obtained by measuring in advance a change in radiant energy for each wavelength of the lamp;
Based on the radiant energy change data stored in the storage unit, the illuminant of at least one kind of luminescent color corresponding to a large radiant energy change is designated, and the frequency of the power supplied to the illuminant is set to a predetermined visible frequency. And an irregular frequency generating means for repeating light and dark at a predetermined time interval and duration;
An illuminating device that reproduces a candlelight characterized by comprising: The anomalous frequency generating means includes the visible frequency, the time interval, and the predetermined frequency within a predetermined visible frequency range, a predetermined time interval range, and a predetermined duration range based on radiant energy change data. The lighting device for reproducing the candlelight according to claim 1, wherein the duration is changed. The lamp is a Japanese candle, and has a red, blue or green and yellow or orange luminescent color, and the irregular frequency generation means is based on radiant energy change data of the Japanese candle, The lighting device for reproducing a candle lamp according to claim 1 or 2, wherein the frequency is switched for at least a part of the red light emitter. The illumination for reproducing a candle lamp according to claim 3, wherein the time interval is in a range of 10 to 90 seconds centered on a range of 30 to 50 seconds, and the frequency is 7 to 13 Hz. apparatus. The illumination for reproducing a candle lamp according to claim 3 or 4, wherein the regular frequency generating means generates a frequency of 7 Hz to 13 Hz for at least a part of a light emitting body of at least one emission color. apparatus. In a reproduction method that reproduces the brightness and fluctuation of candlelight using a light emitter,
With selecting a plurality of light emitters from the center of the flame in the reproduction target lamp that having a plurality of emission colors corresponding to the chromaticity distribution around at least one of the luminescent colors of the light emitter corresponding to a large radiant energy change Selecting the time interval, duration and frequency of the radiant energy change in the given illuminant;
Arranging the light emitters of the respective emission colors from the center toward the outer periphery according to the chromaticity distribution of the flame ;
Providing a constant frequency to a power source supplied to each of the light emitters;
For the predetermined illuminant, switching the frequency of the predetermined luminescent color to a predetermined visible frequency at the time interval, and changing the brightness for the duration;
A method for reproducing a candle lamp characterized by comprising:

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