Wave illumination system and wave illumination method

Abstract

[Problem] To execute a more varied performance in the process of illuminating water surface with a plurality of colors while making the water surface ripple. [Solution] This wave illumination system comprises: a container for storing a liquid; an illumination device that irradiates the liquid in the container with light having a color which changes at a prescribed light emission cycle; and one or more vibration devices that apply vibrations of a prescribed vibration cycle to the liquid in the container. The illumination device changes the color of light irradiated in two or more colors within one light emission cycle, and the light emission cycle and the vibration cycle are different from each other.

Description

Wave illumination system and wave illumination method

[0001] The present invention relates to a wave illumination system and a wave illumination method, and more particularly to a technology for illuminating the surface of water while vibrating the liquid in a container to generate waves.

[0002] It has been known for some time that when photographing a rippling water surface with an imaging device, the ripples can be observed in a still state by exposing the imaging device at the same cycle as the ripples (see, for example, Patent Document 1).

[0003] JP 2020-71316 A

[0004] The inventors have considered that by applying the principle of the photographing device of the above-mentioned Patent Document 1, by vibrating the liquid in a container at a predetermined cycle to make the water surface ripple, and illuminating the water surface at the same cycle as the vibration cycle, it will be possible to observe the waves on the water surface as if they were still, even with the naked eye. In addition, the inventors have considered that, for example, as shown in Figure 8 of this application, using an illumination device such as a stroboscope, the waves on the water surface will be vibrated at one light emission cycle (T Ｌ ) to multiple colors (red, green, blue), it was thought that it would be possible to make the waves on the water surface shine in multiple colors. Note that the applicant and the inventor do not acknowledge that the technology shown in Figure 8 was publicly known at the time of filing this application.

[0005] However, as shown in the example of FIG. 8, the oscillation period of the water surface waves (T Ｖ ) and light emission period (T Ｌ ) are consistent, when one looks at a point on the water surface from a certain viewpoint, the color of the waves at that point will always be constant, giving the viewer a monotonous impression. Therefore, the main purpose of this invention is to give the viewer a more varied impression when illuminating the water surface with multiple colors while creating ripples.

[0006] The inventor of the present invention has intensively studied means for achieving the above-mentioned object, and has discovered that the color of the waves can be changed by differentiating the period of vibration that causes the liquid to ripple and the period of the change in color of the light irradiated onto the liquid. Based on this discovery, the inventor has realized that the above-mentioned object can be achieved, and has completed the present invention. Specifically, the present invention has the following configuration or steps.

[0007] A first aspect of the present invention relates to a wave illumination system 100. The wave illumination system 100 according to the present invention comprises a container 10, an illumination device 20, and one or more vibration devices 30, 40. The container 10 is used to store a liquid L. The illumination device 20 emits a predetermined light emission period (T Ｌ ) that changes color in one light emission cycle (T Ｌ The vibration devices 30 and 40 vibrate the liquid L in the container 10 at a predetermined vibration period (T Ｖ When a plurality of vibration devices 30, 40 are used to vibrate the liquid L, the vibration period (T Ｖ ) means the vibration period of the composite wave obtained by combining the vibration waves of the vibration devices 30 and 40. In the present invention, the light emission period (T Ｌ ) and the vibration period (T Ｖ ) will be different.

[0008] As mentioned above, the light emission period (T Ｌ ) and the oscillation period (T Ｖ ) are consistent, when observing a point on the water surface from a certain viewpoint, the color of the waves generated there will always be constant. Ｌ ) and the oscillation period (T Ｖ By varying the color of the waves generated at a single point on the water surface, the color of the waves will gradually change. This allows the waves on the water surface to shine in multiple colors, giving the viewer a more varied impression.

[0009] In the wave illumination system 100 according to the present invention, the oscillation period (TＶ ) is the light emission period (T Ｌ ) is preferably shifted within ±20 Hz, more preferably within ±10 Hz, and particularly preferably within ±1 Hz. This allows the viewer to observe the changing of the color of the waves. Ｌ When the number of colors that change within the Ｖ ) is the light emission period (T Ｌ ) within ±(10 / N)%. Ｌ ) is 10 ms (frequency 100 Hz), and when the light changes to three colors during one light emission period (N=3), the oscillation period (T Ｖ ) is the light emission period (T Ｌ ) ±3.33%, that is, 9.667 to 10.333 ms (103.444 to 96.777 Hz). Ｖ ) is the light emission period (T Ｌ ) within ±(100 / N)%. Ｌ ) is 10 ms (frequency 100 Hz), and when the light changes to three colors during one light emission period (N=3), the oscillation period (T Ｖ ) is the light emission period (T Ｌ ) ±0.33%, that is, 9.967 to 10.033 ms (100.331 to 99.671 Hz). In this case, the change in color of the waves is even easier to see with the naked eye.

[0010] In the wave lighting system 100 according to the present invention, the one or more vibration devices preferably include a first vibration device 30 and a second vibration device 40. In this case, the vibration periods of the first vibration device 30 and the second vibration device 40 may be the same or different. In this way, by applying vibrations to the liquid L in the container 10 using the multiple vibration devices 30, 40, a complex waveform can be created on the water surface.

[0011] In the wave illumination system 100 according to the present invention, the first vibration period (T Ｖ１) and the second vibration period (T Ｖ２ ) may be different from the first oscillation period (T Ｖ１ ) and the second oscillation period (T Ｖ１ ) varies, the amplitude (wave height) of the composite wave of these vibrations changes periodically, which can create even more complex waveforms on the water surface.

[0012] In the wave illumination system 100 according to the present invention, the second oscillation period (T Ｖ２ ) is the first oscillation period (T Ｖ１ ) is preferably within ±1%. Ｖ２ ) is the first oscillation period (T Ｖ１ ) may deviate within ±0.1%. Ｖ２ ) and the first oscillation period (T Ｖ１ ) is so small that the amplitude (wave height) of the composite wave changes gradually.

[0013] The wave illumination system 100 according to the present invention preferably further comprises a sensor 50 and a control device 60. The sensor 50 detects an object near the surface of the liquid L in the container 10. For example, the sensor 50 can detect a person's hand attempting to touch the water surface. When an object is detected by the sensor 50, the control device 60 determines the vibration period (T Ｖ ) is controlled. This allows for an interactive presentation, such as changing the waveform when a viewer tries to touch the water surface. When multiple vibration devices 30, 40 are present, the vibration periods of the multiple vibration devices 30, 40 may be changed in response to the detection of an object by the sensor 50, or the vibration period of any one of the vibration devices 40 may be changed.

[0014] The second aspect of the present invention relates to a wave illumination method. The wave illumination method according to the present invention applies a predetermined light emission period (T Ｌ ) (light irradiation step), and irradiating the liquid L in the container 10 with light whose color changes at a predetermined vibration period (TＶ In this case, the color of the light to be irradiated changes to two or more colors within one light emission cycle. Ｌ ) and the oscillation period (T Ｖ ) are preferably different.

[0015] According to the present invention, when the water surface is illuminated with a plurality of colors while rippling, it is possible to produce a more varied presentation.

[0016] FIG. 1 is a cross-sectional view showing one embodiment of a wave illumination system. FIG. 2 is an exploded perspective view showing one embodiment of a wave illumination system. FIG. 3 is a block diagram showing the functions of one embodiment of a wave illumination system. FIG. 4 is a schematic diagram showing waves formed by two vibration devices. FIG. 5 is a schematic diagram showing an example of the relationship between the light emission period and the vibration period. FIG. 6 is a schematic diagram showing another example of the relationship between the light emission period and the vibration period. FIG. 7 is a flow chart showing one embodiment of a wave illumination method. FIG. 8 is a diagram for explaining a problem to be solved by the wave illumination system, showing the relationship between the light emission frequency and the vibration frequency.

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and includes appropriate modifications of the embodiments described below within the scope obvious to those skilled in the art.

[0018] Fig. 1 shows a cross-sectional view of a wave illumination system 100 according to an embodiment of the present invention, and Fig. 2 shows an exploded perspective view of the wave illumination system 100. Fig. 3 shows functional blocks of the wave illumination system 100. As shown in these figures, the wave illumination system 100 basically includes a vessel 10, an illumination device 20, a first vibration device 30, a second vibration device 40, a sensor 50, and a control device 60.

[0019] The container 10 is for storing liquid L. The container 10 has a bottom plate 11 and side walls 12 extending from the periphery thereof, forming a space for storing the liquid L. The container 10 is made of, for example, metal or plastic, and can store the liquid L without leakage. In the example shown in FIG. 2 , the container 10 has a rectangular (quadrilateral) bottom plate 11. However, the shape of the bottom plate 11 of the container 10 can also be circular, elliptical, triangular, pentagonal, or other polygonal shapes. The type of liquid L filled into the container 10 is not particularly limited, and may be a transparent liquid (water) or a colored transparent or translucent liquid. Furthermore, in order to form fine waves, the amount of liquid L filled into the container 10 is preferably such that the water depth is, for example, 1 to 20 mm, and more preferably 2 to 15 mm or 3 to 10 mm.

[0020] The lighting device 20 is configured to irradiate the liquid L in the container 10 with light. The lighting device 20 may be placed directly above the container 10, for example, by attaching it to the ceiling or fixing it to a stand. In this case, the optical axis of the lighting device 20 is parallel to the vertical direction. However, the lighting device 20 may also be placed so that the optical axis is inclined with respect to the vertical direction, and light may be irradiated onto the liquid L from diagonally above the container 10.

[0021] The lighting device 20 is capable of repeatedly emitting a colored light source that emits light instantaneously at regular intervals. Specifically, a known stroboscope may be used as the lighting device 20. The lighting device 20 emits light for one light emission cycle (T Ｌ ) the color of the light irradiated onto the liquid L is periodically changed to a plurality of colors. For example, Ｌ The lighting device 20 may be provided with three or more monochromatic LEDs that emit light in any one of R (red), G (green), and B (blue), or may be provided with one or more full-color LEDs whose emitted light color can be controlled. Ｌ ) can be set to, for example, 1 to 1000 ms (frequency: 1000 to 1 Hz), and considering that it is visible to the naked eye, one light emission period (T Ｌ) is preferably set to 10 to 100 ms (frequency: 100 to 10 Hz).

[0022] The first vibration device 30 and the second vibration device 40 are used to generate waves in the liquid L in the container 10 by applying vibrations to the liquid. In this embodiment, each of the vibration devices 30, 40 is a speaker capable of outputting sound waves. Alternatively, each of the vibration devices 30, 40 may be a known device that mechanically generates vibrations using an actuator such as a motor. As shown in FIG. 1 , each of the vibration devices 30, 40 has its sound wave output portion fixed in close contact with or in close proximity to the bottom plate 11 of the container 10. Therefore, the sound waves generated by each of the vibration devices 30, 40 vibrate the bottom plate 11 of the container 10, and the vibrations are transmitted to the liquid L in the container 10. Therefore, the liquid L in the container 10 vibrates at a frequency substantially the same as the frequency of the sound waves generated by the vibration devices 30, 40, generating waves on the surface of the liquid L.

[0023] 4 is a plan view of the container 10 storing the liquid L, and schematically shows the arrangement of the first vibration device 30 and the second vibration device 40, and the ripples generated by the vibrations from the vibration devices 30, 40. As shown in Fig. 4, the first vibration device 30 and the second vibration device 40 are arranged at an interval on the back side of the container 10. When there are two wave sources like this, the two waves will overlap, but the wave height will be strong at the point where the two waves intersect in phase, and the wave height will be low or zero at the point where the two waves intersect in antiphase.

[0024] The sensor 50 is provided for the purpose of detecting when an object approaches the liquid L in the container 10 or when an object enters the liquid L. The main detection target is a human finger. For example, an area sensor may be used as the sensor 50. Specifically, the sensor 50 (area sensor) is attached to the side wall 12 of the container 10, irradiates an inspection light parallel to the water surface or the bottom plate 11, and receives the inspection light again. The sensor 50 then detects the presence of an object based on a change in the inspection light caused by the inspection light being reflected by an object or blocked by an object. When the state of the inspection light changes, the sensor 50 generates an object detection signal and transmits it to the control device 60.

[0025] As shown in FIG. 3 , the control device 60 is connected wirelessly or by wire to the lighting device 20, the first vibration device 30, the second vibration device 40, and the sensor 50, and controls each of these devices. Specifically, the control device 60 can control the light-emitting state (e.g., light-emitting color, light-emitting brightness, light-emitting period, etc.) of the first vibration device 30. The control device 60 can also control the vibration state (e.g., vibration intensity, vibration period, etc.) of each vibration device 30, 40. As described above, the sensor 50 transmits an object detection signal to the control device 60. The control device 60 can change or control the light-emitting state of the lighting device 20 and the vibration state of each vibration device 30, 40 based on the object detection signal received from the sensor 50. The control device 60 can be a general-purpose personal computer (PC) or a microcomputer designed specifically for this system. The control device 60 basically includes a processor (e.g., CPU), memory (e.g., RAM), and an input / output interface. A predetermined program is stored in the memory, and the processor controls each of the devices 20, 30, 40, and 50 via the input / output interface in accordance with this program.

[0026] As shown in FIGS. 1 and 2 , the wave lighting system 100 primarily comprises a support structure for the container 10 and each vibration device 30, 40. The support structure includes a floating floor material 70, a grating 80, and a support base 90. The floating floor material 70 is laid on the underside of the bottom plate 11 of the container 10. The floating floor material 70 is arranged to efficiently vibrate the entire container 10, which stores liquid, using it as a floating floor. An example of the floating floor material 70 is a rubber chip mat. The material of the rubber chip mat is not particularly limited, but known materials such as urethane and EPDM (ethylene propylene diene rubber) may be used. Holes are formed in the floating floor material 70 at positions corresponding to the placement of each vibration device 30, 40 (speaker), and each vibration device 30, 40 is inserted into this hole. This prevents the liquid L in the container 10 from adhering to each vibration device 30, 40. The grating 80 is a lattice-like structure made of metal such as stainless steel or aluminum. Each vibration device 30, 40 is fixed to the grating 80 while being placed in the opening of the grating 80. This allows each vibration device 30, 40 to be maintained in close contact with or in close proximity to the back surface of the bottom plate 11 of the container 10. The support base 90 is mainly used to raise the container 10, each vibration device 30, 40, floating floor material 70, and grating 80 to a height that allows viewers to easily observe the waves generated in the liquid L in the container 10 and touch the liquid L. For convenience of drawing, the support base 90 is omitted from FIG. 2.

[0027] Next, the relationship between the light emission period of the lighting device 20 and the vibration period of the vibration devices 30, 40 will be specifically described with reference to Figs. 5 and 6. Note that Figs. 5 and 6 are schematic representations of the relationship between the light emission period and the vibration period, and do not strictly correspond to the actual periods and frequencies. Fig. 5 first illustrates the basic concept of the present invention. In the example shown in Fig. 5, the light emission period of the lighting device 20 is represented by the symbol T Ｌ and one light emission period (T Ｌ ) the light emission color changes in the order of R (red), green (G), and blue (B). Ｌ) is repeated, the emitted color changes periodically in the order of R, G, and B. In the example shown in FIG. 5, the light emission frequency of the lighting device 20 is set to 100 Hz, so the light emission period (T Ｌ ) is 10 ms.

[0028] On the other hand, in FIG. 5, the vibration period of the vibrations applied to the liquid L by the vibration devices 30 and 40 is denoted by the symbol T Ｖ In the example shown in FIG. 5, the vibration periods of the vibrations caused by the vibration devices 30 and 40 are the same, so the amplitude of the vibrations applied to the liquid L is constant. Here, one vibration period (T Ｖ ) corresponds to the peak of the wave of the liquid L in the container 10. Therefore, when observing the wave generated at a point in the liquid L in the container 10 from a certain viewpoint, the wave Ｖ ) the light appears to be shining in a color corresponding to the light emitted by the lighting device 20. For example, in the example shown in FIG. 5, the first oscillation period (T Ｖ At the time when the amplitude of the wave (wave length) is maximum, the wave of the liquid L appears blue because the lighting device 20 is irradiating blue (G) light.

[0029] Also, as shown in FIG. 5, the vibration period (T Ｖ ) is the light emission period (T Ｌ ), but there is a slight deviation. Specifically, in the example shown in FIG. 5, the vibration frequency is set to 100.3 Hz, so the vibration period (T Ｖ As mentioned above, the light emission period (T Ｌ ) is 10 ms, so the vibration period (T Ｖ ) is shorter than this, causing a shift. Ｖ ) is the light emission period (T Ｌ ), the light from the lighting device 20 changes periodically in the order of R, B, and G, whereas the color of the waves of the liquid L in the container 10 changes periodically in the order of R, B, and G. In the example shown in FIG. Ｌ ) is 10 ms (100 Hz), and the vibration period (T Ｖ) is 9.97 ms (100.3 Hz), so a deviation of 0.03 ms occurs for 10 ms. The deviation amount per second is 3 ms. In the example of FIG. 5, the light emission color of the lighting device 20 is set at one light emission period (T Ｌ ), the three colors change over the course of 1.1 seconds (1,100 ms), so the emission time for each color is approximately 3.3 ms. Therefore, when observing a wave occurring at a point on the surface of Liquid L from a certain viewpoint, the color of the wave changes in approximately 1.1 seconds (1,100 ms). This allows the viewer to appreciate the gradual change in the color of the wave of Liquid L.

[0030] In the example shown in FIG. 5, the vibration period (T Ｖ ) is the light emission period (T Ｌ ) is set to be short relative to the oscillation period (T Ｖ ) is the light emission period (T Ｌ ) is set to a long value, the color of the wave can be changed in the same way. For example, in contrast to the above example, Ｌ ) with respect to the oscillation period (T Ｖ ) may be set to 10.3 ms. In the example shown in FIG. 5, one light emission period (T Ｌ ) the light emission color changes to three colors, but for example, Ｌ In this case, the light emission color may be changed to four colors within a light emission period (T Ｌ ) with respect to the oscillation period (T Ｖ ) is preferably 9.925 ms (100.75 Hz) or 10.025 ms (99.75 Hz).

[0031] Next, FIG. 6 shows an application example in which the vibration period (T Ｖ１ ) and the vibration period (T Ｖ２ ) of the first vibrating device 30. Ｖ１ ) is referred to as the "first vibration period", and the vibration period (T Ｖ２ ) is referred to as the "second vibration period." In the example shown in FIG. Ｖ１ ) is set to 9.97 ms (100.3 Hz), and the second oscillation period (T Ｖ２In this case, the vibration period (T Ｖ ) corresponds to the vibration period of the composite wave obtained by combining the vibration of the first vibrating device 30 and the vibration of the second vibrating device 40. Ｖ１ ) is 9.97 ms, and the second oscillation period (T Ｖ２ ) is 9.96 ms, the oscillation period of these composite waves (T Ｖ ) is close to the average value of each wave (approximately 9.965 ms). The same is true for the frequency.

[0032] Furthermore, because the vibration waves of the first vibration device 30 and the second vibration device 40 have different periods as described above, they gradually shift out of phase and then repeat this cycle of matching phase again. When the two vibration waves are in phase, they reinforce each other, resulting in a larger amplitude of the composite wave. When the two vibration waves are out of phase, they weaken each other, resulting in a smaller amplitude of the composite wave. When the amplitudes of the two vibration waves are equal, the amplitude of the composite wave is at most twice that of each vibration wave when the phases are in phase, and at its minimum, zero, when the phases are out of phase. The amplitude of the composite wave periodically changes between maximum and minimum values. In this way, by making the periods of the vibration waves of the first vibration device 30 and the second vibration device 40 different, it is possible to create an undulation in the composite wave whose amplitude periodically changes.

[0033] As shown in Figure 6, the amplitude of the composite wave changes periodically, and this amplitude of the composite wave corresponds to the height of the waves formed in the liquid L. When the wave height is large, the amount of light irradiated from the lighting device 20 that is reflected increases, and the waves appear to be relatively bright and shiny to the viewer. On the other hand, when the wave height is small, the amount of light irradiated from the lighting device 20 that is reflected decreases, and the waves appear to be relatively weakly shiny to the viewer. In this way, by forming periodic undulations in the wave height, it is possible to create changes in the way the waves appear.

[0034] The vibration period (T Ｖ１ ) and the vibration period (T Ｖ２ ) as well as the oscillation period of the composite wave (TＶ : for example, about 9.965 ms) is also the light emission period (T Ｌ 6, the viewer can see the color of the waves of the liquid L gradually change.

[0035] Next, FIG. 7 shows an example of a control flow of the lighting device 20, the first vibration device 30, and the second vibration device 40 by the control device 60. First, the control device 60 sends control signals to the lighting device 20, the first vibration device 30, and the second vibration device 40, respectively, to drive each device (steps S1 to S3). Specifically, the control device 60 causes the lighting device 20 to emit light and drives the first vibration device 30 and the second vibration device 40 to impart vibration to the liquid L. At this time, the control device 60 specifies the light emission state (e.g., light emission color, light emission brightness, light emission period) of the lighting device 20. In the illustrated example, the control device 60 sets the lighting device 20 to 100 Hz (light emission period 10 ms) and emits light in three colors (RGB) during one light emission period. Similarly, the control device 60 specifies the vibration state (e.g., vibration intensity, vibration period) of the first vibration device 30 and the second vibration device 40. In the illustrated example, the control device 60 drives the first vibration device 30 at 100.3 Hz (vibration period 9.97 ms) and the second vibration device 40 at 100.4 Hz (vibration period 9.96 ms). Note that in Fig. 7, the initial vibration frequency of the second vibration device 40 is set to the first frequency. In the example shown in Fig. 7, the control device 60 causes the lighting device 20 and the first vibration device 30 to continue emitting light and vibrating in accordance with the conditions specified here until a stop signal is sent.

[0036] Meanwhile, the control device 60 changes the vibration state of the second vibration device 40 in response to the detection signal from the sensor 50. That is, the control device 60 determines whether the sensor 50 has detected an object near the surface of the liquid L based on the signal received from the sensor 50 (step S4). If no object is detected, the control device 60 returns to step S3 and drives the second vibration device 40 in its initial state. On the other hand, if an object is detected, the control device 60 changes the vibration frequency of the second vibration device 40 (step S5). Specifically, in the illustrated example, the control device 60 changes the vibration frequency of the second vibration device 40 from 100.4 Hz (vibration period 9.96 ms) to 101.3 Hz (vibration period 9.87 ms). Note that in FIG. 7 , the changed vibration frequency of the second vibration device 40 is referred to as the second frequency. This second frequency may be any value different from the first frequency, such as the vibration frequency (100.3 Hz) of the first vibration device 30 or the light emission frequency (100 Hz) of the lighting device 20. Changing the vibration frequency of the second vibration device 40 in this way changes the state of the composite wave, which is a composite of the vibration waves of the first vibration device 30 and the second vibration device 40. This gives a viewer who touches the surface of the liquid L the impression that the water surface is reacting to their finger. The control device 60 then determines whether a certain time has elapsed since changing the vibration frequency of the second vibration device 40 to the second frequency (step S6), and after the certain time has elapsed, returns the vibration frequency of the second vibration device 40 to the first frequency. While the certain time is not particularly limited, a value of approximately 5 to 60 seconds is appropriate. The control device 60 may repeatedly execute the control process (steps S3 to S6) described herein for the second vibration device 40 until it sends a stop signal.

[0037] In the above description of the present invention, the embodiments of the present invention have been described with reference to the drawings in order to express the contents of the present invention. However, the present invention is not limited to the above embodiments, and includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the present specification.

[0038] DESCRIPTION OF SYMBOLS 10... Container 11... Bottom plate 12... Side wall 20... Lighting device 30... First vibration device 40... Second vibration device 50... Sensor 60... Control device 70... Floating floor material 80... Grating 90... Support base 100... Wave lighting system L... Liquid

Claims

1. A wave lighting system comprising: a container for storing liquid; a lighting device that irradiates the liquid in the container with light that changes color at a predetermined light emission period; and one or more vibration devices that impart vibrations at a predetermined vibration period to the liquid in the container, wherein the lighting device changes the color of the light it irradiates to two or more colors within one light emission period, and the light emission period and the vibration period are different.

2. The wave lighting system according to claim 1, wherein the oscillation period deviates from the light emission period by within ±(10 / N)%, where N is the number of colors that change within one light emission period.

3. The wave illumination system of claim 1, wherein the one or more vibration devices include a first vibration device and a second vibration device.

4. The wave lighting system of claim 3, wherein the first vibration period of the vibration by the first vibration device and the second vibration period of the vibration by the second vibration device are different.

5. The wave illumination system of claim 4, wherein the second oscillation period deviates from the first oscillation period by within ±1%.

6. The wave lighting system of claim 1, further comprising: a sensor for detecting an object near the surface of the liquid in the container; and a control device for controlling the one or more vibration devices so that the vibration period of the vibration applied to the liquid in the container is changed when the object is detected by the sensor.

7. A wave lighting method comprising the steps of irradiating a liquid in a container with light whose color changes at a predetermined light emission period, and imparting vibrations at a predetermined vibration period to the liquid in the container, wherein the color of the irradiated light changes in two or more colors within one light emission period, and the light emission period and the vibration period are different.

Images